Merge pull request #12 from shadowsocks/master

Merge with upstream

CHANGES

@@ -1,3 +1,9 @@
+2.2 2015-01-14
+- Support updating PAC from GFWList
+- Support adding server by scanning QR Code
+- Output timestamp in logs
+- Minor fixes
+
 2.1.6 2015-01-02
 - Fix OPTIONS requests
 - Improve logs

README.md

@@ -17,7 +17,7 @@ Download [latest release].
 
 For <= Windows 7, download Shadowsocks-win-x.x.x.zip.
 
-For >= Windows 8, download Shadowsocks-win-dotnet4.0-x.x.x.zip.
+For >= Windows 8, download Shadowsocks-win-dotnet4.0-x.x.x.zip, unless you have .Net 2.0 installed.
 
 #### Usage
 
@@ -30,6 +30,10 @@ about the change automatically
 6. Please disable other proxy addons in your browser, or set them to use
 system proxy
 
+### Develop
+
+Visual Studio Express 2012 is recommended.
+
 #### License
 
 GPLv3

shadowsocks-csharp/3rd/SimpleJson.cs

@@ -1035,13 +1035,13 @@ namespace SimpleJson
 
         protected static bool SerializeArray(IJsonSerializerStrategy jsonSerializerStrategy, IEnumerable anArray, StringBuilder builder)
         {
-            builder.Append("[");
+            builder.Append("[\r\n  ");
 
             bool first = true;
             foreach (object value in anArray)
             {
                 if (!first)
-                    builder.Append(",");
+                    builder.Append(",\r\n  ");
 
                 if (!SerializeValue(jsonSerializerStrategy, value, builder))
                     return false;
@@ -1049,7 +1049,7 @@ namespace SimpleJson
                 first = false;
             }
 
-            builder.Append("]");
+            builder.Append("\r\n]");
             return true;
         }
 

shadowsocks-csharp/3rd/zxing/BarcodeFormat.cs

@@ -0,0 +1,89 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+namespace ZXing
+{
+   /// <summary>
+   /// Enumerates barcode formats known to this package.
+   /// </summary>
+   /// <author>Sean Owen</author>
+   [System.Flags]
+   public enum BarcodeFormat
+   {
+      /// <summary>Aztec 2D barcode format.</summary>
+      AZTEC = 1,
+
+      /// <summary>CODABAR 1D format.</summary>
+      CODABAR = 2,
+
+      /// <summary>Code 39 1D format.</summary>
+      CODE_39 = 4,
+
+      /// <summary>Code 93 1D format.</summary>
+      CODE_93 = 8,
+
+      /// <summary>Code 128 1D format.</summary>
+      CODE_128 = 16,
+
+      /// <summary>Data Matrix 2D barcode format.</summary>
+      DATA_MATRIX = 32,
+
+      /// <summary>EAN-8 1D format.</summary>
+      EAN_8 = 64,
+
+      /// <summary>EAN-13 1D format.</summary>
+      EAN_13 = 128,
+
+      /// <summary>ITF (Interleaved Two of Five) 1D format.</summary>
+      ITF = 256,
+
+      /// <summary>MaxiCode 2D barcode format.</summary>
+      MAXICODE = 512,
+
+      /// <summary>PDF417 format.</summary>
+      PDF_417 = 1024,
+
+      /// <summary>QR Code 2D barcode format.</summary>
+      QR_CODE = 2048,
+
+      /// <summary>RSS 14</summary>
+      RSS_14 = 4096,
+
+      /// <summary>RSS EXPANDED</summary>
+      RSS_EXPANDED = 8192,
+
+      /// <summary>UPC-A 1D format.</summary>
+      UPC_A = 16384,
+
+      /// <summary>UPC-E 1D format.</summary>
+      UPC_E = 32768,
+
+      /// <summary>UPC/EAN extension format. Not a stand-alone format.</summary>
+      UPC_EAN_EXTENSION = 65536,
+
+      /// <summary>MSI</summary>
+      MSI = 131072,
+
+      /// <summary>Plessey</summary>
+      PLESSEY = 262144,
+
+      /// <summary>
+      /// UPC_A | UPC_E | EAN_13 | EAN_8 | CODABAR | CODE_39 | CODE_93 | CODE_128 | ITF | RSS_14 | RSS_EXPANDED
+      /// without MSI (to many false-positives)
+      /// </summary>
+      All_1D = UPC_A | UPC_E | EAN_13 | EAN_8 | CODABAR | CODE_39 | CODE_93 | CODE_128 | ITF | RSS_14 | RSS_EXPANDED
+   }
+}

shadowsocks-csharp/3rd/zxing/BaseLuminanceSource.cs

@@ -0,0 +1,206 @@
+/*
+* Copyright 2012 ZXing.Net authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+
+namespace ZXing
+{
+   /// <summary>
+   /// The base class for luminance sources which supports 
+   /// cropping and rotating based upon the luminance values.
+   /// </summary>
+   public abstract class BaseLuminanceSource : LuminanceSource
+   {
+      // the following channel weights give nearly the same
+      // gray scale picture as the java version with BufferedImage.TYPE_BYTE_GRAY
+      // they are used in sub classes for luminance / gray scale calculation
+      protected const int RChannelWeight = 19562;
+      protected const int GChannelWeight = 38550;
+      protected const int BChannelWeight = 7424;
+      protected const int ChannelWeight = 16;
+
+      /// <summary>
+      /// 
+      /// </summary>
+      protected byte[] luminances;
+
+      /// <summary>
+      /// Initializes a new instance of the <see cref="BaseLuminanceSource"/> class.
+      /// </summary>
+      /// <param name="width">The width.</param>
+      /// <param name="height">The height.</param>
+      protected BaseLuminanceSource(int width, int height)
+         : base(width, height)
+      {
+         luminances = new byte[width * height];
+      }
+
+      /// <summary>
+      /// Initializes a new instance of the <see cref="BaseLuminanceSource"/> class.
+      /// </summary>
+      /// <param name="luminanceArray">The luminance array.</param>
+      /// <param name="width">The width.</param>
+      /// <param name="height">The height.</param>
+      protected BaseLuminanceSource(byte[] luminanceArray, int width, int height)
+         : base(width, height)
+      {
+         luminances = new byte[width * height];
+         Buffer.BlockCopy(luminanceArray, 0, luminances, 0, width * height);
+      }
+
+      /// <summary>
+      /// Fetches one row of luminance data from the underlying platform's bitmap. Values range from
+      /// 0 (black) to 255 (white). It is preferable for implementations of this method
+      /// to only fetch this row rather than the whole image, since no 2D Readers may be installed and
+      /// getMatrix() may never be called.
+      /// </summary>
+      /// <param name="y">The row to fetch, 0 &lt;= y &lt; Height.</param>
+      /// <param name="row">An optional preallocated array. If null or too small, it will be ignored.
+      /// Always use the returned object, and ignore the .length of the array.</param>
+      /// <returns>
+      /// An array containing the luminance data.
+      /// </returns>
+      override public byte[] getRow(int y, byte[] row)
+      {
+         int width = Width;
+         if (row == null || row.Length < width)
+         {
+            row = new byte[width];
+         }
+         for (int i = 0; i < width; i++)
+            row[i] = luminances[y * width + i];
+         return row;
+      }
+
+      public override byte[] Matrix
+      {
+         get { return luminances; }
+      }
+
+      /// <summary>
+      /// Returns a new object with rotated image data by 90 degrees counterclockwise.
+      /// Only callable if {@link #isRotateSupported()} is true.
+      /// </summary>
+      /// <returns>
+      /// A rotated version of this object.
+      /// </returns>
+      public override LuminanceSource rotateCounterClockwise()
+      {
+         var rotatedLuminances = new byte[Width * Height];
+         var newWidth = Height;
+         var newHeight = Width;
+         var localLuminances = Matrix;
+         for (var yold = 0; yold < Height; yold++)
+         {
+            for (var xold = 0; xold < Width; xold++)
+            {
+               var ynew = newHeight - xold - 1;
+               var xnew = yold;
+               rotatedLuminances[ynew * newWidth + xnew] = localLuminances[yold * Width + xold];
+            }
+         }
+         return CreateLuminanceSource(rotatedLuminances, newWidth, newHeight);
+      }
+
+      /// <summary>
+      /// TODO: not implemented yet
+      /// </summary>
+      /// <returns>
+      /// A rotated version of this object.
+      /// </returns>
+      public override LuminanceSource rotateCounterClockwise45()
+      {
+         // TODO: implement a good 45 degrees rotation without lost of information
+         return base.rotateCounterClockwise45();
+      }
+
+      /// <summary>
+      /// </summary>
+      /// <returns> Whether this subclass supports counter-clockwise rotation.</returns>
+      public override bool RotateSupported
+      {
+         get
+         {
+            return true;
+         }
+      }
+
+      /// <summary>
+      /// Returns a new object with cropped image data. Implementations may keep a reference to the
+      /// original data rather than a copy. Only callable if CropSupported is true.
+      /// </summary>
+      /// <param name="left">The left coordinate, 0 &lt;= left &lt; Width.</param>
+      /// <param name="top">The top coordinate, 0 &lt;= top &lt;= Height.</param>
+      /// <param name="width">The width of the rectangle to crop.</param>
+      /// <param name="height">The height of the rectangle to crop.</param>
+      /// <returns>
+      /// A cropped version of this object.
+      /// </returns>
+      public override LuminanceSource crop(int left, int top, int width, int height)
+      {
+         if (left + width > Width || top + height > Height)
+         {
+            throw new ArgumentException("Crop rectangle does not fit within image data.");
+         }
+         var croppedLuminances = new byte[width * height];
+         var oldLuminances = Matrix;
+         var oldWidth = Width;
+         var oldRightBound = left + width;
+         var oldBottomBound = top + height;
+         for (int yold = top, ynew = 0; yold < oldBottomBound; yold++, ynew++)
+         {
+            for (int xold = left, xnew = 0; xold < oldRightBound; xold++, xnew++)
+            {
+               croppedLuminances[ynew * width + xnew] = oldLuminances[yold * oldWidth + xold];
+            }
+         }
+         return CreateLuminanceSource(croppedLuminances, width, height);
+      }
+
+      /// <summary>
+      /// </summary>
+      /// <returns> Whether this subclass supports cropping.</returns>
+      public override bool CropSupported
+      {
+         get
+         {
+            return true;
+         }
+      }
+
+      /// <summary>
+      /// </summary>
+      /// <returns>Whether this subclass supports invertion.</returns>
+      public override bool InversionSupported
+      {
+         get
+         {
+            return true;
+         }
+      }
+
+
+      /// <summary>
+      /// Should create a new luminance source with the right class type.
+      /// The method is used in methods crop and rotate.
+      /// </summary>
+      /// <param name="newLuminances">The new luminances.</param>
+      /// <param name="width">The width.</param>
+      /// <param name="height">The height.</param>
+      /// <returns></returns>
+      protected abstract LuminanceSource CreateLuminanceSource(byte[] newLuminances, int width, int height);
+   }
+}

shadowsocks-csharp/3rd/zxing/Binarizer.cs

@@ -0,0 +1,104 @@
+/*
+* Copyright 2009 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+
+using ZXing.Common;
+
+namespace ZXing
+{
+   /// <summary> This class hierarchy provides a set of methods to convert luminance data to 1 bit data.
+   /// It allows the algorithm to vary polymorphically, for example allowing a very expensive
+   /// thresholding technique for servers and a fast one for mobile. It also permits the implementation
+   /// to vary, e.g. a JNI version for Android and a Java fallback version for other platforms.
+   /// 
+   /// <author>dswitkin@google.com (Daniel Switkin)</author>
+   /// </summary>
+   public abstract class Binarizer
+   {
+      private readonly LuminanceSource source;
+
+      /// <summary>
+      /// Initializes a new instance of the <see cref="Binarizer"/> class.
+      /// </summary>
+      /// <param name="source">The source.</param>
+      protected internal Binarizer(LuminanceSource source)
+      {
+         if (source == null)
+         {
+            throw new ArgumentException("Source must be non-null.");
+         }
+         this.source = source;
+      }
+
+      /// <summary>
+      /// Gets the luminance source object.
+      /// </summary>
+      virtual public LuminanceSource LuminanceSource
+      {
+         get
+         {
+            return source;
+         }
+      }
+
+      /// <summary> Converts one row of luminance data to 1 bit data. May actually do the conversion, or return
+      /// cached data. Callers should assume this method is expensive and call it as seldom as possible.
+      /// This method is intended for decoding 1D barcodes and may choose to apply sharpening.
+      /// For callers which only examine one row of pixels at a time, the same BitArray should be reused
+      /// and passed in with each call for performance. However it is legal to keep more than one row
+      /// at a time if needed.
+      /// </summary>
+      /// <param name="y">The row to fetch, 0 &lt;= y &lt; bitmap height.</param>
+      /// <param name="row">An optional preallocated array. If null or too small, it will be ignored.
+      /// If used, the Binarizer will call BitArray.clear(). Always use the returned object.
+      /// </param>
+      /// <returns> The array of bits for this row (true means black).</returns>
+      public abstract BitArray getBlackRow(int y, BitArray row);
+
+      /// <summary> Converts a 2D array of luminance data to 1 bit data. As above, assume this method is expensive
+      /// and do not call it repeatedly. This method is intended for decoding 2D barcodes and may or
+      /// may not apply sharpening. Therefore, a row from this matrix may not be identical to one
+      /// fetched using getBlackRow(), so don't mix and match between them.
+      /// </summary>
+      /// <returns> The 2D array of bits for the image (true means black).</returns>
+      public abstract BitMatrix BlackMatrix { get; }
+
+      /// <summary> Creates a new object with the same type as this Binarizer implementation, but with pristine
+      /// state. This is needed because Binarizer implementations may be stateful, e.g. keeping a cache
+      /// of 1 bit data. See Effective Java for why we can't use Java's clone() method.
+      /// </summary>
+      /// <param name="source">The LuminanceSource this Binarizer will operate on.</param>
+      /// <returns> A new concrete Binarizer implementation object.</returns>
+      public abstract Binarizer createBinarizer(LuminanceSource source);
+
+      /// <summary>
+      /// Gets the width of the luminance source object.
+      /// </summary>
+      public int Width
+      {
+         get { return source.Width; }
+      }
+
+      /// <summary>
+      /// Gets the height of the luminance source object.
+      /// </summary>
+      public int Height
+      {
+         get { return source.Height; }
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/BinaryBitmap.cs

@@ -0,0 +1,186 @@
+/*
+* Copyright 2009 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+using ZXing.Common;
+
+namespace ZXing
+{
+
+   /// <summary> This class is the core bitmap class used by ZXing to represent 1 bit data. Reader objects
+   /// accept a BinaryBitmap and attempt to decode it.
+   /// 
+   /// </summary>
+   /// <author>  dswitkin@google.com (Daniel Switkin)
+   /// </author>
+   /// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source 
+   /// </author>
+
+   public sealed class BinaryBitmap
+   {
+      private Binarizer binarizer;
+      private BitMatrix matrix;
+
+      public BinaryBitmap(Binarizer binarizer)
+      {
+         if (binarizer == null)
+         {
+            throw new ArgumentException("Binarizer must be non-null.");
+         }
+         this.binarizer = binarizer;
+      }
+
+      /// <returns> The width of the bitmap.
+      /// </returns>
+      public int Width
+      {
+         get
+         {
+            return binarizer.Width;
+         }
+
+      }
+      /// <returns> The height of the bitmap.
+      /// </returns>
+      public int Height
+      {
+         get
+         {
+            return binarizer.Height;
+         }
+
+      }
+
+      /// <summary> Converts one row of luminance data to 1 bit data. May actually do the conversion, or return
+      /// cached data. Callers should assume this method is expensive and call it as seldom as possible.
+      /// This method is intended for decoding 1D barcodes and may choose to apply sharpening.
+      /// 
+      /// </summary>
+      /// <param name="y">The row to fetch, 0 &lt;= y &lt; bitmap height.
+      /// </param>
+      /// <param name="row">An optional preallocated array. If null or too small, it will be ignored.
+      /// If used, the Binarizer will call BitArray.clear(). Always use the returned object.
+      /// </param>
+      /// <returns> The array of bits for this row (true means black).
+      /// </returns>
+      public BitArray getBlackRow(int y, BitArray row)
+      {
+         return binarizer.getBlackRow(y, row);
+      }
+
+      /// <summary> Converts a 2D array of luminance data to 1 bit. As above, assume this method is expensive
+      /// and do not call it repeatedly. This method is intended for decoding 2D barcodes and may or
+      /// may not apply sharpening. Therefore, a row from this matrix may not be identical to one
+      /// fetched using getBlackRow(), so don't mix and match between them.
+      /// 
+      /// </summary>
+      /// <returns> The 2D array of bits for the image (true means black).
+      /// </returns>
+      public BitMatrix BlackMatrix
+      {
+         get
+         {
+            // The matrix is created on demand the first time it is requested, then cached. There are two
+            // reasons for this:
+            // 1. This work will never be done if the caller only installs 1D Reader objects, or if a
+            //    1D Reader finds a barcode before the 2D Readers run.
+            // 2. This work will only be done once even if the caller installs multiple 2D Readers.
+            if (matrix == null)
+            {
+               matrix = binarizer.BlackMatrix;
+            }
+            return matrix;
+         }
+      }
+
+      /// <returns> Whether this bitmap can be cropped.
+      /// </returns>
+      public bool CropSupported
+      {
+         get
+         {
+            return binarizer.LuminanceSource.CropSupported;
+         }
+
+      }
+
+      /// <summary> Returns a new object with cropped image data. Implementations may keep a reference to the
+      /// original data rather than a copy. Only callable if isCropSupported() is true.
+      /// 
+      /// </summary>
+      /// <param name="left">The left coordinate, 0 &lt;= left &lt; getWidth().
+      /// </param>
+      /// <param name="top">The top coordinate, 0 &lt;= top &lt;= getHeight().
+      /// </param>
+      /// <param name="width">The width of the rectangle to crop.
+      /// </param>
+      /// <param name="height">The height of the rectangle to crop.
+      /// </param>
+      /// <returns> A cropped version of this object.
+      /// </returns>
+      public BinaryBitmap crop(int left, int top, int width, int height)
+      {
+         var newSource = binarizer.LuminanceSource.crop(left, top, width, height);
+         return new BinaryBitmap(binarizer.createBinarizer(newSource));
+      }
+
+      /// <returns> Whether this bitmap supports counter-clockwise rotation.
+      /// </returns>
+      public bool RotateSupported
+      {
+         get
+         {
+            return binarizer.LuminanceSource.RotateSupported;
+         }
+
+      }
+
+      /// <summary>
+      /// Returns a new object with rotated image data by 90 degrees counterclockwise.
+      /// Only callable if {@link #isRotateSupported()} is true.
+      /// </summary>
+      /// <returns> A rotated version of this object.
+      /// </returns>
+      public BinaryBitmap rotateCounterClockwise()
+      {
+         var newSource = binarizer.LuminanceSource.rotateCounterClockwise();
+         return new BinaryBitmap(binarizer.createBinarizer(newSource));
+      }
+
+      /// <summary>
+      /// Returns a new object with rotated image data by 45 degrees counterclockwise.
+      /// Only callable if {@link #isRotateSupported()} is true.
+      /// </summary>
+      /// <returns>A rotated version of this object.</returns>
+      public BinaryBitmap rotateCounterClockwise45()
+      {
+         LuminanceSource newSource = binarizer.LuminanceSource.rotateCounterClockwise45();
+         return new BinaryBitmap(binarizer.createBinarizer(newSource));
+      }
+
+      /// <summary>
+      /// Returns a <see cref="System.String"/> that represents this instance.
+      /// </summary>
+      /// <returns>
+      /// A <see cref="System.String"/> that represents this instance.
+      /// </returns>
+      public override string ToString()
+      {
+         var blackMatrix = BlackMatrix;
+         return blackMatrix != null ? blackMatrix.ToString() : String.Empty;
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/BitmapLuminanceSource.cs

@@ -0,0 +1,242 @@
+/*
+* Copyright 2012 ZXing.Net authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+using System.Drawing.Imaging;
+using System.Drawing;
+using System.Runtime.InteropServices;
+
+namespace ZXing
+{
+   public partial class BitmapLuminanceSource : BaseLuminanceSource
+   {
+      /// <summary>
+      /// Initializes a new instance of the <see cref="BitmapLuminanceSource"/> class.
+      /// </summary>
+      /// <param name="width">The width.</param>
+      /// <param name="height">The height.</param>
+      protected BitmapLuminanceSource(int width, int height)
+         : base(width, height)
+      {
+      }
+
+      /// <summary>
+      /// Initializes a new instance of the <see cref="BitmapLuminanceSource"/> class
+      /// with the image of a Bitmap instance
+      /// </summary>
+      /// <param name="bitmap">The bitmap.</param>
+      public BitmapLuminanceSource(Bitmap bitmap)
+         : base(bitmap.Width, bitmap.Height)
+      {
+         var height = bitmap.Height;
+         var width = bitmap.Width;
+
+         // In order to measure pure decoding speed, we convert the entire image to a greyscale array
+         // The underlying raster of image consists of bytes with the luminance values
+#if WindowsCE
+         var data = bitmap.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
+#else
+         var data = bitmap.LockBits(new Rectangle(0, 0, width, height), ImageLockMode.ReadOnly, bitmap.PixelFormat);
+#endif
+         try
+         {
+            var stride = Math.Abs(data.Stride);
+            var pixelWidth = stride/width;
+
+            if (pixelWidth > 4)
+            {
+               // old slow way for unsupported bit depth
+               Color c;
+               for (int y = 0; y < height; y++)
+               {
+                  int offset = y*width;
+                  for (int x = 0; x < width; x++)
+                  {
+                     c = bitmap.GetPixel(x, y);
+                     luminances[offset + x] = (byte)((RChannelWeight * c.R + GChannelWeight * c.G + BChannelWeight * c.B) >> ChannelWeight);
+                  }
+               }
+            }
+            else
+            {
+               var strideStep = data.Stride;
+               var buffer = new byte[stride];
+               var ptrInBitmap = data.Scan0;
+
+#if !WindowsCE
+               // prepare palette for 1 and 8 bit indexed bitmaps
+               var luminancePalette = new byte[bitmap.Palette.Entries.Length];
+               for (var index = 0; index < bitmap.Palette.Entries.Length; index++)
+               {
+                  var color = bitmap.Palette.Entries[index];
+                  luminancePalette[index] = (byte) ((RChannelWeight*color.R +
+                                                     GChannelWeight*color.G +
+                                                     BChannelWeight*color.B) >> ChannelWeight);
+               }
+               if (bitmap.PixelFormat == PixelFormat.Format32bppArgb ||
+                   bitmap.PixelFormat == PixelFormat.Format32bppPArgb)
+               {
+                  pixelWidth = 40;
+               }
+               if ((int)bitmap.PixelFormat == 8207 ||
+                   (bitmap.Flags & (int)ImageFlags.ColorSpaceCmyk) == (int)ImageFlags.ColorSpaceCmyk)
+               {
+                  pixelWidth = 41;
+               }
+#endif
+
+               for (int y = 0; y < height; y++)
+               {
+                  // copy a scanline not the whole bitmap because of memory usage
+                  Marshal.Copy(ptrInBitmap, buffer, 0, stride);
+#if NET40
+                  ptrInBitmap = IntPtr.Add(ptrInBitmap, strideStep);
+#else
+                  ptrInBitmap = new IntPtr(ptrInBitmap.ToInt64() + strideStep);
+#endif
+                  var offset = y*width;
+                  switch (pixelWidth)
+                  {
+#if !WindowsCE
+                     case 0:
+                        for (int x = 0; x*8 < width; x++)
+                        {
+                           for (int subX = 0; subX < 8 && 8*x + subX < width; subX++)
+                           {
+                              var index = (buffer[x] >> (7 - subX)) & 1;
+                              luminances[offset + 8*x + subX] = luminancePalette[index];
+                           }
+                        }
+                        break;
+                     case 1:
+                        for (int x = 0; x < width; x++)
+                        {
+                           luminances[offset + x] = luminancePalette[buffer[x]];
+                        }
+                        break;
+#endif
+                     case 2:
+                        // should be RGB565 or RGB555, assume RGB565
+                        {
+                           var maxIndex = 2*width;
+                           for (int index = 0; index < maxIndex; index += 2)
+                           {
+                              var byte1 = buffer[index];
+                              var byte2 = buffer[index + 1];
+
+                              var b5 = byte1 & 0x1F;
+                              var g5 = (((byte1 & 0xE0) >> 5) | ((byte2 & 0x03) << 3)) & 0x1F;
+                              var r5 = (byte2 >> 2) & 0x1F;
+                              var r8 = (r5*527 + 23) >> 6;
+                              var g8 = (g5*527 + 23) >> 6;
+                              var b8 = (b5*527 + 23) >> 6;
+
+                              luminances[offset] = (byte)((RChannelWeight * r8 + GChannelWeight * g8 + BChannelWeight * b8)  >> ChannelWeight);
+                              offset++;
+                           }
+                        }
+                        break;
+                     case 3:
+                        {
+                           var maxIndex = width*3;
+                           for (int x = 0; x < maxIndex; x += 3)
+                           {
+                              var luminance = (byte) ((BChannelWeight*buffer[x] +
+                                                       GChannelWeight*buffer[x + 1] +
+                                                       RChannelWeight*buffer[x + 2]) >> ChannelWeight);
+                              luminances[offset] = luminance;
+                              offset++;
+                           }
+                        }
+                        break;
+                     case 4:
+                        // 4 bytes without alpha channel value
+                        {
+                           var maxIndex = 4*width;
+                           for (int x = 0; x < maxIndex; x += 4)
+                           {
+                              var luminance = (byte) ((BChannelWeight*buffer[x] +
+                                                       GChannelWeight*buffer[x + 1] +
+                                                       RChannelWeight*buffer[x + 2]) >> ChannelWeight);
+
+                              luminances[offset] = luminance;
+                              offset++;
+                           }
+                        }
+                        break;
+                     case 40:
+                        // with alpha channel; some barcodes are completely black if you
+                        // only look at the r, g and b channel but the alpha channel controls
+                        // the view
+                        {
+                           var maxIndex = 4*width;
+                           for (int x = 0; x < maxIndex; x += 4)
+                           {
+                              var luminance = (byte) ((BChannelWeight*buffer[x] +
+                                                       GChannelWeight*buffer[x + 1] +
+                                                       RChannelWeight*buffer[x + 2]) >> ChannelWeight);
+
+                              // calculating the resulting luminance based upon a white background
+                              // var alpha = buffer[x * pixelWidth + 3] / 255.0;
+                              // luminance = (byte)(luminance * alpha + 255 * (1 - alpha));
+                              var alpha = buffer[x + 3];
+                              luminance = (byte) (((luminance*alpha) >> 8) + (255*(255 - alpha) >> 8) + 1);
+                              luminances[offset] = luminance;
+                              offset++;
+                           }
+                        }
+                        break;
+                     case 41:
+                        // CMYK color space
+                        {
+                           var maxIndex = 4 * width;
+                           for (int x = 0; x < maxIndex; x += 4)
+                           {
+                              var luminance = (byte) (255 - ((BChannelWeight*buffer[x] +
+                                                              GChannelWeight*buffer[x + 1] +
+                                                              RChannelWeight*buffer[x + 2]) >> ChannelWeight));
+                              // Ignore value of k at the moment
+                              luminances[offset] = luminance;
+                              offset++;
+                           }
+                        }
+                        break;
+                     default:
+                        throw new NotSupportedException();
+                  }
+               }
+            }
+         }
+         finally
+         {
+            bitmap.UnlockBits(data);
+         }
+      }
+
+      /// <summary>
+      /// Should create a new luminance source with the right class type.
+      /// The method is used in methods crop and rotate.
+      /// </summary>
+      /// <param name="newLuminances">The new luminances.</param>
+      /// <param name="width">The width.</param>
+      /// <param name="height">The height.</param>
+      /// <returns></returns>
+      protected override LuminanceSource CreateLuminanceSource(byte[] newLuminances, int width, int height)
+      {
+         return new BitmapLuminanceSource(width, height) { luminances = newLuminances };
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/DecodeHintType.cs

@@ -0,0 +1,125 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+using System.Collections.Generic;
+
+namespace ZXing
+{
+   /// <summary>
+   /// Encapsulates a type of hint that a caller may pass to a barcode reader to help it
+   /// more quickly or accurately decode it. It is up to implementations to decide what,
+   /// if anything, to do with the information that is supplied.
+   /// <seealso cref="Reader.decode(BinaryBitmap, IDictionary{DecodeHintType, object})" />
+   /// </summary>
+   /// <author>Sean Owen</author>
+   /// <author>dswitkin@google.com (Daniel Switkin)</author>
+   public enum DecodeHintType
+   {
+      /// <summary>
+      /// Unspecified, application-specific hint. Maps to an unspecified <see cref="System.Object" />.
+      /// </summary>
+      OTHER,
+
+      /// <summary>
+      /// Image is a pure monochrome image of a barcode. Doesn't matter what it maps to;
+      /// use <see cref="bool" /> = true.
+      /// </summary>
+      PURE_BARCODE,
+
+      /// <summary>
+      /// Image is known to be of one of a few possible formats.
+      /// Maps to a <see cref="System.Collections.ICollection" /> of <see cref="BarcodeFormat" />s.
+      /// </summary>
+      POSSIBLE_FORMATS,
+
+      /// <summary>
+      /// Spend more time to try to find a barcode; optimize for accuracy, not speed.
+      /// Doesn't matter what it maps to; use <see cref="bool" /> = true.
+      /// </summary>
+      TRY_HARDER,
+
+      /// <summary>
+      /// Specifies what character encoding to use when decoding, where applicable (type String)
+      /// </summary>
+      CHARACTER_SET,
+
+      /// <summary>
+      /// Allowed lengths of encoded data -- reject anything else. Maps to an int[].
+      /// </summary>
+      ALLOWED_LENGTHS,
+
+      /// <summary>
+      /// Assume Code 39 codes employ a check digit. Maps to <see cref="bool" />.
+      /// </summary>
+      ASSUME_CODE_39_CHECK_DIGIT,
+
+      /// <summary>
+      /// The caller needs to be notified via callback when a possible <see cref="ResultPoint" />
+      /// is found. Maps to a <see cref="ResultPointCallback" />.
+      /// </summary>
+      NEED_RESULT_POINT_CALLBACK,
+
+      /// <summary>
+      /// Assume MSI codes employ a check digit. Maps to <see cref="bool" />.
+      /// </summary>
+      ASSUME_MSI_CHECK_DIGIT,
+
+      /// <summary>
+      /// if Code39 could be detected try to use extended mode for full ASCII character set
+      /// Maps to <see cref="bool" />.
+      /// </summary>
+      USE_CODE_39_EXTENDED_MODE,
+
+      /// <summary>
+      /// Don't fail if a Code39 is detected but can't be decoded in extended mode.
+      /// Return the raw Code39 result instead. Maps to <see cref="bool" />.
+      /// </summary>
+      RELAXED_CODE_39_EXTENDED_MODE,
+
+      /// <summary>
+      /// 1D readers supporting rotation with TRY_HARDER enabled.
+      /// But BarcodeReader class can do auto-rotating for 1D and 2D codes.
+      /// Enabling that option prevents 1D readers doing double rotation.
+      /// BarcodeReader enables that option automatically if "global" auto-rotation is enabled.
+      /// Maps to <see cref="bool" />.
+      /// </summary>
+      TRY_HARDER_WITHOUT_ROTATION,
+
+      /// <summary>
+      /// Assume the barcode is being processed as a GS1 barcode, and modify behavior as needed.
+      /// For example this affects FNC1 handling for Code 128 (aka GS1-128). Doesn't matter what it maps to;
+      /// use <see cref="bool" />.
+      /// </summary>
+      ASSUME_GS1,
+
+      /// <summary>
+      /// If true, return the start and end digits in a Codabar barcode instead of stripping them. They
+      /// are alpha, whereas the rest are numeric. By default, they are stripped, but this causes them
+      /// to not be. Doesn't matter what it maps to; use <see cref="bool" />.
+      /// </summary>
+      RETURN_CODABAR_START_END,
+
+      /// <summary>
+      /// Allowed extension lengths for EAN or UPC barcodes. Other formats will ignore this.
+      /// Maps to an <see cref="Array.int" /> of the allowed extension lengths, for example [2], [5], or [2, 5].
+      /// If it is optional to have an extension, do not set this hint. If this is set,
+      /// and a UPC or EAN barcode is found but an extension is not, then no result will be returned
+      /// at all.
+      /// </summary>
+      ALLOWED_EAN_EXTENSIONS
+   }
+}

shadowsocks-csharp/3rd/zxing/EncodeHintType.cs

@@ -0,0 +1,131 @@
+/*
+* Copyright 2008 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+namespace ZXing
+{
+   /// <summary>
+   /// These are a set of hints that you may pass to Writers to specify their behavior.
+   /// </summary>
+   /// <author>dswitkin@google.com (Daniel Switkin)</author>
+   public enum EncodeHintType
+   {
+      /// <summary>
+      /// Specifies the width of the barcode image
+      /// type: <see cref="System.Int32" />
+      /// </summary>
+      WIDTH,
+
+      /// <summary>
+      /// Specifies the height of the barcode image
+      /// type: <see cref="System.Int32" />
+      /// </summary>
+      HEIGHT,
+
+      /// <summary>
+      /// Don't put the content string into the output image.
+      /// type: <see cref="System.Boolean" />
+      /// </summary>
+      PURE_BARCODE,
+
+      /// <summary>
+      /// Specifies what degree of error correction to use, for example in QR Codes.
+      /// Type depends on the encoder. For example for QR codes it's type
+      /// <see cref="ZXing.QrCode.Internal.ErrorCorrectionLevel" />
+      /// For Aztec it is of type <see cref="System.Int32" />, representing the minimal percentage of error correction words. 
+      /// Note: an Aztec symbol should have a minimum of 25% EC words.
+      /// For PDF417 it is of type <see cref="ZXing.PDF417.Internal.PDF417ErrorCorrectionLevel"/> or <see cref="System.Int32" /> (between 0 and 8),
+      /// </summary>
+      ERROR_CORRECTION,
+
+      /// <summary>
+      /// Specifies what character encoding to use where applicable.
+      /// type: <see cref="System.String" />
+      /// </summary>
+      CHARACTER_SET,
+
+      /// <summary>
+      /// Specifies margin, in pixels, to use when generating the barcode. The meaning can vary
+      /// by format; for example it controls margin before and after the barcode horizontally for
+      /// most 1D formats.
+      /// type: <see cref="System.Int32" />
+      /// </summary>
+      MARGIN,
+
+      /// <summary>
+      /// Specifies whether to use compact mode for PDF417.
+      /// type: <see cref="System.Boolean" />
+      /// </summary>
+      PDF417_COMPACT,
+
+      /// <summary>
+      /// Specifies what compaction mode to use for PDF417.
+      /// type: <see cref="ZXing.PDF417.Internal.Compaction" />
+      /// </summary>
+      PDF417_COMPACTION,
+
+      /// <summary>
+      /// Specifies the minimum and maximum number of rows and columns for PDF417.
+      /// type: <see cref="ZXing.PDF417.Internal.Dimensions" />
+      /// </summary>
+      PDF417_DIMENSIONS,
+
+      /// <summary>
+      /// Don't append ECI segment.
+      /// That is against the specification of QR Code but some
+      /// readers have problems if the charset is switched from
+      /// ISO-8859-1 (default) to UTF-8 with the necessary ECI segment.
+      /// If you set the property to true you can use UTF-8 encoding
+      /// and the ECI segment is omitted.
+      /// type: <see cref="System.Boolean" />
+      /// </summary>
+      DISABLE_ECI,
+
+      /// <summary>
+      /// Specifies the matrix shape for Data Matrix (type <see cref="ZXing.Datamatrix.Encoder.SymbolShapeHint"/>)
+      /// </summary>
+      DATA_MATRIX_SHAPE,
+
+      /// <summary>
+      /// Specifies a minimum barcode size (type <see cref="ZXing.Dimension"/>). Only applicable to Data Matrix now.
+      /// </summary>
+      MIN_SIZE,
+
+      /// <summary>
+      /// Specifies a maximum barcode size (type <see cref="ZXing.Dimension"/>). Only applicable to Data Matrix now.
+      /// </summary>
+      MAX_SIZE,
+
+      /// <summary>
+      /// if true, don't switch to codeset C for numbers
+      /// </summary>
+      CODE128_FORCE_CODESET_B,
+
+      /// <summary>
+      /// Specifies the default encodation for Data Matrix (type <see cref="ZXing.Datamatrix.Encoder.Encodation"/>)
+      /// Make sure that the content fits into the encodation value, otherwise there will be an exception thrown.
+      /// standard value: Encodation.ASCII
+      /// </summary>
+      DATA_MATRIX_DEFAULT_ENCODATION,
+
+      /// <summary>
+      /// Specifies the required number of layers for an Aztec code:
+      /// a negative number (-1, -2, -3, -4) specifies a compact Aztec code
+      /// 0 indicates to use the minimum number of layers (the default)
+      /// a positive number (1, 2, .. 32) specifies a normal (non-compact) Aztec code
+      /// </summary>
+      AZTEC_LAYERS,
+   }
+}

shadowsocks-csharp/3rd/zxing/LuminanceSource.cs

@@ -0,0 +1,198 @@
+/*
+* Copyright 2009 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+using System.Text;
+
+namespace ZXing
+{
+   /// <summary> The purpose of this class hierarchy is to abstract different bitmap implementations across
+   /// platforms into a standard interface for requesting greyscale luminance values. The interface
+   /// only provides immutable methods; therefore crop and rotation create copies. This is to ensure
+   /// that one Reader does not modify the original luminance source and leave it in an unknown state
+   /// for other Readers in the chain.
+   /// </summary>
+   /// <author>  dswitkin@google.com (Daniel Switkin)
+   /// </author>
+   /// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source 
+   /// </author>
+   public abstract class LuminanceSource
+   {
+      private int width;
+      private int height;
+
+      protected LuminanceSource(int width, int height)
+      {
+         this.width = width;
+         this.height = height;
+      }
+
+      /// <summary> Fetches one row of luminance data from the underlying platform's bitmap. Values range from
+      /// 0 (black) to 255 (white). Because Java does not have an unsigned byte type, callers will have
+      /// to bitwise and with 0xff for each value. It is preferable for implementations of this method
+      /// to only fetch this row rather than the whole image, since no 2D Readers may be installed and
+      /// getMatrix() may never be called.
+      /// 
+      /// </summary>
+      /// <param name="y">The row to fetch, 0 &lt;= y &lt; Height.
+      /// </param>
+      /// <param name="row">An optional preallocated array. If null or too small, it will be ignored.
+      /// Always use the returned object, and ignore the .length of the array.
+      /// </param>
+      /// <returns> An array containing the luminance data.
+      /// </returns>
+      public abstract byte[] getRow(int y, byte[] row);
+
+      /// <summary> Fetches luminance data for the underlying bitmap. Values should be fetched using:
+      /// int luminance = array[y * width + x] &amp; 0xff;
+      /// 
+      /// </summary>
+      /// <returns> A row-major 2D array of luminance values. Do not use result.length as it may be
+      /// larger than width * height bytes on some platforms. Do not modify the contents
+      /// of the result.
+      /// </returns>
+      public abstract byte[] Matrix { get; }
+
+      /// <returns> The width of the bitmap.</returns>
+      virtual public int Width
+      {
+         get
+         {
+            return width;
+         }
+         protected set
+         {
+            width = value;
+         }
+      }
+
+      /// <returns> The height of the bitmap.</returns>
+      virtual public int Height
+      {
+         get
+         {
+            return height;
+         }
+         protected set
+         {
+            height = value;
+         }
+      }
+
+      /// <returns> Whether this subclass supports cropping.</returns>
+      virtual public bool CropSupported
+      {
+         get
+         {
+            return false;
+         }
+      }
+
+      /// <summary> Returns a new object with cropped image data. Implementations may keep a reference to the
+      /// original data rather than a copy. Only callable if CropSupported is true.
+      /// 
+      /// </summary>
+      /// <param name="left">The left coordinate, 0 &lt;= left &lt; Width.
+      /// </param>
+      /// <param name="top">The top coordinate, 0 &lt;= top &lt;= Height.
+      /// </param>
+      /// <param name="width">The width of the rectangle to crop.
+      /// </param>
+      /// <param name="height">The height of the rectangle to crop.
+      /// </param>
+      /// <returns> A cropped version of this object.
+      /// </returns>
+      public virtual LuminanceSource crop(int left, int top, int width, int height)
+      {
+         throw new NotSupportedException("This luminance source does not support cropping.");
+      }
+
+      /// <returns> Whether this subclass supports counter-clockwise rotation.</returns>
+      virtual public bool RotateSupported
+      {
+         get
+         {
+            return false;
+         }
+      }
+
+      /// <summary>
+      /// Returns a new object with rotated image data by 90 degrees counterclockwise.
+      /// Only callable if {@link #isRotateSupported()} is true.
+      /// </summary>
+      /// <returns> A rotated version of this object.
+      /// </returns>
+      public virtual LuminanceSource rotateCounterClockwise()
+      {
+         throw new NotSupportedException("This luminance source does not support rotation.");
+      }
+
+      /// <summary>
+      /// Returns a new object with rotated image data by 45 degrees counterclockwise.
+      /// Only callable if {@link #isRotateSupported()} is true.
+      /// </summary>
+      /// <returns>A rotated version of this object.</returns>
+      public virtual LuminanceSource rotateCounterClockwise45()
+      {
+         throw new NotSupportedException("This luminance source does not support rotation by 45 degrees.");
+      }
+
+      /// <summary>
+      /// </summary>
+      /// <returns>Whether this subclass supports invertion.</returns>
+      virtual public bool InversionSupported
+      {
+         get
+         {
+            return false;
+         }
+      }
+
+      override public String ToString()
+      {
+         var row = new byte[width];
+         var result = new StringBuilder(height * (width + 1));
+         for (int y = 0; y < height; y++)
+         {
+            row = getRow(y, row);
+            for (int x = 0; x < width; x++)
+            {
+               int luminance = row[x] & 0xFF;
+               char c;
+               if (luminance < 0x40)
+               {
+                  c = '#';
+               }
+               else if (luminance < 0x80)
+               {
+                  c = '+';
+               }
+               else if (luminance < 0xC0)
+               {
+                  c = '.';
+               }
+               else
+               {
+                  c = ' ';
+               }
+               result.Append(c);
+            }
+            result.Append('\n');
+         }
+         return result.ToString();
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/Result.cs

@@ -0,0 +1,161 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+using System.Collections.Generic;
+
+namespace ZXing
+{
+   /// <summary>
+   /// Encapsulates the result of decoding a barcode within an image.
+   /// </summary>
+   public sealed class Result
+   {
+      /// <returns>raw text encoded by the barcode, if applicable, otherwise <code>null</code></returns>
+      public String Text { get; private set; }
+
+      /// <returns>raw bytes encoded by the barcode, if applicable, otherwise <code>null</code></returns>
+      public byte[] RawBytes { get; private set; }
+
+      /// <returns>
+      /// points related to the barcode in the image. These are typically points
+      /// identifying finder patterns or the corners of the barcode. The exact meaning is
+      /// specific to the type of barcode that was decoded.
+      /// </returns>
+      public ResultPoint[] ResultPoints { get; private set; }
+
+      /// <returns>{@link BarcodeFormat} representing the format of the barcode that was decoded</returns>
+      public BarcodeFormat BarcodeFormat { get; private set; }
+
+      /// <returns>
+      /// {@link Hashtable} mapping {@link ResultMetadataType} keys to values. May be
+      /// <code>null</code>. This contains optional metadata about what was detected about the barcode,
+      /// like orientation.
+      /// </returns>
+      public IDictionary<ResultMetadataType, object> ResultMetadata { get; private set; }
+
+      /// <summary>
+      /// Gets the timestamp.
+      /// </summary>
+      public long Timestamp { get; private set; }
+
+      /// <summary>
+      /// Initializes a new instance of the <see cref="Result"/> class.
+      /// </summary>
+      /// <param name="text">The text.</param>
+      /// <param name="rawBytes">The raw bytes.</param>
+      /// <param name="resultPoints">The result points.</param>
+      /// <param name="format">The format.</param>
+      public Result(String text,
+                    byte[] rawBytes,
+                    ResultPoint[] resultPoints,
+                    BarcodeFormat format)
+         : this(text, rawBytes, resultPoints, format, DateTime.Now.Ticks)
+      {
+      }
+
+      /// <summary>
+      /// Initializes a new instance of the <see cref="Result"/> class.
+      /// </summary>
+      /// <param name="text">The text.</param>
+      /// <param name="rawBytes">The raw bytes.</param>
+      /// <param name="resultPoints">The result points.</param>
+      /// <param name="format">The format.</param>
+      /// <param name="timestamp">The timestamp.</param>
+      public Result(String text, byte[] rawBytes, ResultPoint[] resultPoints, BarcodeFormat format, long timestamp)
+      {
+         if (text == null && rawBytes == null)
+         {
+            throw new ArgumentException("Text and bytes are null");
+         }
+         Text = text;
+         RawBytes = rawBytes;
+         ResultPoints = resultPoints;
+         BarcodeFormat = format;
+         ResultMetadata = null;
+         Timestamp = timestamp;
+      }
+
+      /// <summary>
+      /// Adds one metadata to the result
+      /// </summary>
+      /// <param name="type">The type.</param>
+      /// <param name="value">The value.</param>
+      public void putMetadata(ResultMetadataType type, Object value)
+      {
+         if (ResultMetadata == null)
+         {
+            ResultMetadata = new Dictionary<ResultMetadataType, object>();
+         }
+         ResultMetadata[type] = value;
+      }
+
+      /// <summary>
+      /// Adds a list of metadata to the result
+      /// </summary>
+      /// <param name="metadata">The metadata.</param>
+      public void putAllMetadata(IDictionary<ResultMetadataType, object> metadata)
+      {
+         if (metadata != null)
+         {
+            if (ResultMetadata == null)
+            {
+               ResultMetadata = metadata;
+            }
+            else
+            {
+               foreach (var entry in metadata)
+                  ResultMetadata[entry.Key] = entry.Value;
+            }
+         }
+      }
+
+      /// <summary>
+      /// Adds the result points.
+      /// </summary>
+      /// <param name="newPoints">The new points.</param>
+      public void addResultPoints(ResultPoint[] newPoints)
+      {
+         var oldPoints = ResultPoints;
+         if (oldPoints == null)
+         {
+            ResultPoints = newPoints;
+         }
+         else if (newPoints != null && newPoints.Length > 0)
+         {
+            var allPoints = new ResultPoint[oldPoints.Length + newPoints.Length];
+            Array.Copy(oldPoints, 0, allPoints, 0, oldPoints.Length);
+            Array.Copy(newPoints, 0, allPoints, oldPoints.Length, newPoints.Length);
+            ResultPoints = allPoints;
+         }
+      }
+
+      /// <summary>
+      /// Returns a <see cref="System.String"/> that represents this instance.
+      /// </summary>
+      /// <returns>
+      /// A <see cref="System.String"/> that represents this instance.
+      /// </returns>
+      public override String ToString()
+      {
+         if (Text == null)
+         {
+            return "[" + RawBytes.Length + " bytes]";
+         }
+         return Text;
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/ResultMetadataType.cs

@@ -0,0 +1,102 @@
+/*
+ * Copyright 2008 ZXing authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+namespace ZXing
+{
+   /// <summary>
+   /// Represents some type of metadata about the result of the decoding that the decoder
+   /// wishes to communicate back to the caller.
+   /// </summary>
+   /// <author>Sean Owen</author>
+   public enum ResultMetadataType
+   {
+      /// <summary>
+      /// Unspecified, application-specific metadata. Maps to an unspecified {@link Object}.
+      /// </summary>
+      OTHER,
+
+      /// <summary>
+      /// Denotes the likely approximate orientation of the barcode in the image. This value
+      /// is given as degrees rotated clockwise from the normal, upright orientation.
+      /// For example a 1D barcode which was found by reading top-to-bottom would be
+      /// said to have orientation "90". This key maps to an {@link Integer} whose
+      /// value is in the range [0,360).
+      /// </summary>
+      ORIENTATION,
+
+      /// <summary>
+      /// <p>2D barcode formats typically encode text, but allow for a sort of 'byte mode'
+      /// which is sometimes used to encode binary data. While {@link Result} makes available
+      /// the complete raw bytes in the barcode for these formats, it does not offer the bytes
+      /// from the byte segments alone.</p>
+      /// <p>This maps to a {@link java.util.List} of byte arrays corresponding to the
+      /// raw bytes in the byte segments in the barcode, in order.</p>
+      /// </summary>
+      BYTE_SEGMENTS,
+
+      /// <summary>
+      /// Error correction level used, if applicable. The value type depends on the
+      /// format, but is typically a String.
+      /// </summary>
+      ERROR_CORRECTION_LEVEL,
+
+      /// <summary>
+      /// For some periodicals, indicates the issue number as an {@link Integer}.
+      /// </summary>
+      ISSUE_NUMBER,
+
+      /// <summary>
+      /// For some products, indicates the suggested retail price in the barcode as a
+      /// formatted {@link String}.
+      /// </summary>
+      SUGGESTED_PRICE,
+
+      /// <summary>
+      /// For some products, the possible country of manufacture as a {@link String} denoting the
+      /// ISO country code. Some map to multiple possible countries, like "US/CA".
+      /// </summary>
+      POSSIBLE_COUNTRY,
+
+      /// <summary>
+      /// For some products, the extension text
+      /// </summary>
+      UPC_EAN_EXTENSION,
+
+      /// <summary>
+      /// If the code format supports structured append and
+      /// the current scanned code is part of one then the
+      /// sequence number is given with it.
+      /// </summary>
+      STRUCTURED_APPEND_SEQUENCE,
+
+      /// <summary>
+      /// If the code format supports structured append and
+      /// the current scanned code is part of one then the
+      /// parity is given with it.
+      /// </summary>
+      STRUCTURED_APPEND_PARITY,
+
+      /// <summary>
+      /// PDF417-specific metadata
+      /// </summary>
+      PDF417_EXTRA_METADATA,
+
+      /// <summary>
+      /// Aztec-specific metadata
+      /// </summary>
+      AZTEC_EXTRA_METADATA
+   }
+}

shadowsocks-csharp/3rd/zxing/ResultPoint.cs

@@ -0,0 +1,191 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+
+using ZXing.Common.Detector;
+
+namespace ZXing
+{
+   /// <summary>
+   /// Encapsulates a point of interest in an image containing a barcode. Typically, this
+   /// would be the location of a finder pattern or the corner of the barcode, for example.
+   /// </summary>
+   /// <author>Sean Owen</author>
+   /// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source</author>
+   public class ResultPoint
+   {
+      private readonly float x;
+      private readonly float y;
+      private readonly byte[] bytesX;
+      private readonly byte[] bytesY;
+      private String toString;
+
+      /// <summary>
+      /// Initializes a new instance of the <see cref="ResultPoint"/> class.
+      /// </summary>
+      public ResultPoint()
+      {
+      }
+
+      /// <summary>
+      /// Initializes a new instance of the <see cref="ResultPoint"/> class.
+      /// </summary>
+      /// <param name="x">The x.</param>
+      /// <param name="y">The y.</param>
+      public ResultPoint(float x, float y)
+      {
+         this.x = x;
+         this.y = y;
+         // calculate only once for GetHashCode
+         bytesX = BitConverter.GetBytes(x);
+         bytesY = BitConverter.GetBytes(y);
+      }
+
+      /// <summary>
+      /// Gets the X.
+      /// </summary>
+      virtual public float X
+      {
+         get
+         {
+            return x;
+         }
+      }
+
+      /// <summary>
+      /// Gets the Y.
+      /// </summary>
+      virtual public float Y
+      {
+         get
+         {
+            return y;
+         }
+      }
+
+      /// <summary>
+      /// Determines whether the specified <see cref="System.Object"/> is equal to this instance.
+      /// </summary>
+      /// <param name="other">The <see cref="System.Object"/> to compare with this instance.</param>
+      /// <returns>
+      ///   <c>true</c> if the specified <see cref="System.Object"/> is equal to this instance; otherwise, <c>false</c>.
+      /// </returns>
+      public override bool Equals(Object other)
+      {
+         var otherPoint = other as ResultPoint;
+         if (otherPoint == null)
+            return false;
+         return x == otherPoint.x && y == otherPoint.y;
+      }
+
+      /// <summary>
+      /// Returns a hash code for this instance.
+      /// </summary>
+      /// <returns>
+      /// A hash code for this instance, suitable for use in hashing algorithms and data structures like a hash table. 
+      /// </returns>
+      public override int GetHashCode()
+      {
+         return 31 * ((bytesX[0] << 24) + (bytesX[1] << 16) + (bytesX[2] << 8) + bytesX[3]) +
+                      (bytesY[0] << 24) + (bytesY[1] << 16) + (bytesY[2] << 8) + bytesY[3];
+      }
+
+      /// <summary>
+      /// Returns a <see cref="System.String"/> that represents this instance.
+      /// </summary>
+      /// <returns>
+      /// A <see cref="System.String"/> that represents this instance.
+      /// </returns>
+      public override String ToString()
+      {
+         if (toString == null)
+         {
+            var result = new System.Text.StringBuilder(25);
+            result.AppendFormat(System.Globalization.CultureInfo.CurrentUICulture, "({0}, {1})", x, y);
+            toString = result.ToString();
+         }
+         return toString;
+      }
+
+      /// <summary>
+      /// Orders an array of three ResultPoints in an order [A,B,C] such that AB &lt; AC and
+      /// BC &lt; AC and the angle between BC and BA is less than 180 degrees.
+      /// </summary>
+      public static void orderBestPatterns(ResultPoint[] patterns)
+      {
+         // Find distances between pattern centers
+         float zeroOneDistance = distance(patterns[0], patterns[1]);
+         float oneTwoDistance = distance(patterns[1], patterns[2]);
+         float zeroTwoDistance = distance(patterns[0], patterns[2]);
+
+         ResultPoint pointA, pointB, pointC;
+         // Assume one closest to other two is B; A and C will just be guesses at first
+         if (oneTwoDistance >= zeroOneDistance && oneTwoDistance >= zeroTwoDistance)
+         {
+            pointB = patterns[0];
+            pointA = patterns[1];
+            pointC = patterns[2];
+         }
+         else if (zeroTwoDistance >= oneTwoDistance && zeroTwoDistance >= zeroOneDistance)
+         {
+            pointB = patterns[1];
+            pointA = patterns[0];
+            pointC = patterns[2];
+         }
+         else
+         {
+            pointB = patterns[2];
+            pointA = patterns[0];
+            pointC = patterns[1];
+         }
+
+         // Use cross product to figure out whether A and C are correct or flipped.
+         // This asks whether BC x BA has a positive z component, which is the arrangement
+         // we want for A, B, C. If it's negative, then we've got it flipped around and
+         // should swap A and C.
+         if (crossProductZ(pointA, pointB, pointC) < 0.0f)
+         {
+            ResultPoint temp = pointA;
+            pointA = pointC;
+            pointC = temp;
+         }
+
+         patterns[0] = pointA;
+         patterns[1] = pointB;
+         patterns[2] = pointC;
+      }
+
+
+      /// <returns>
+      /// distance between two points
+      /// </returns>
+      public static float distance(ResultPoint pattern1, ResultPoint pattern2)
+      {
+         return MathUtils.distance(pattern1.x, pattern1.y, pattern2.x, pattern2.y);
+      }
+
+      /// <summary>
+      /// Returns the z component of the cross product between vectors BC and BA.
+      /// </summary>
+      private static float crossProductZ(ResultPoint pointA, ResultPoint pointB, ResultPoint pointC)
+      {
+         float bX = pointB.x;
+         float bY = pointB.y;
+         return ((pointC.x - bX) * (pointA.y - bY)) - ((pointC.y - bY) * (pointA.x - bX));
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/ResultPointCallback.cs

@@ -0,0 +1,26 @@
+/*
+* Copyright 2009 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+namespace ZXing
+{
+   /// <summary> Callback which is invoked when a possible result point (significant
+   /// point in the barcode image such as a corner) is found.
+   /// 
+   /// </summary>
+   /// <seealso cref="DecodeHintType.NEED_RESULT_POINT_CALLBACK">
+   /// </seealso>
+   public delegate void ResultPointCallback(ResultPoint point);
+}

shadowsocks-csharp/3rd/zxing/Version.cs

@@ -1,342 +0,0 @@
-/*
-* Copyright 2007 ZXing authors
-*
-* Licensed under the Apache License, Version 2.0 (the "License");
-* you may not use this file except in compliance with the License.
-* You may obtain a copy of the License at
-*
-*      http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
-
-using System;
-
-using ZXing.Common;
-
-namespace ZXing.QrCode.Internal
-{
-   /// <summary>
-   /// See ISO 18004:2006 Annex D
-   /// </summary>
-   /// <author>Sean Owen</author>
-   public sealed class Version
-   {
-
-      private static readonly Version[] VERSIONS = buildVersions();
-
-      private readonly int versionNumber;
-      private readonly int[] alignmentPatternCenters;
-      private readonly ECBlocks[] ecBlocks;
-      private readonly int totalCodewords;
-
-      private Version(int versionNumber, int[] alignmentPatternCenters, params ECBlocks[] ecBlocks)
-      {
-         this.versionNumber = versionNumber;
-         this.alignmentPatternCenters = alignmentPatternCenters;
-         this.ecBlocks = ecBlocks;
-         int total = 0;
-         int ecCodewords = ecBlocks[0].ECCodewordsPerBlock;
-         ECB[] ecbArray = ecBlocks[0].getECBlocks();
-         foreach (var ecBlock in ecbArray)
-         {
-            total += ecBlock.Count * (ecBlock.DataCodewords + ecCodewords);
-         }
-         this.totalCodewords = total;
-      }
-
-      /// <summary>
-      /// Gets the version number.
-      /// </summary>
-      public int VersionNumber
-      {
-         get
-         {
-            return versionNumber;
-         }
-
-      }
-
-      /// <summary>
-      /// Gets the total codewords.
-      /// </summary>
-      public int TotalCodewords
-      {
-         get
-         {
-            return totalCodewords;
-         }
-
-      }
-
-      /// <summary>
-      /// Gets the dimension for version.
-      /// </summary>
-      public int DimensionForVersion
-      {
-         get
-         {
-            return 17 + 4 * versionNumber;
-         }
-
-      }
-
-      /// <summary>
-      /// Gets the EC blocks for level.
-      /// </summary>
-      /// <param name="ecLevel">The ec level.</param>
-      /// <returns></returns>
-      public ECBlocks getECBlocksForLevel(ErrorCorrectionLevel ecLevel)
-      {
-         return ecBlocks[ecLevel.ordinal()];
-      }
-
-      /// <summary>
-      /// Gets the version for number.
-      /// </summary>
-      /// <param name="versionNumber">The version number.</param>
-      /// <returns></returns>
-      public static Version getVersionForNumber(int versionNumber)
-      {
-         if (versionNumber < 1 || versionNumber > 40)
-         {
-            throw new ArgumentException();
-         }
-         return VERSIONS[versionNumber - 1];
-      }
-
-
-      /// <summary> <p>Encapsulates a set of error-correction blocks in one symbol version. Most versions will
-      /// use blocks of differing sizes within one version, so, this encapsulates the parameters for
-      /// each set of blocks. It also holds the number of error-correction codewords per block since it
-      /// will be the same across all blocks within one version.</p>
-      /// </summary>
-      public sealed class ECBlocks
-      {
-         private readonly int ecCodewordsPerBlock;
-         private readonly ECB[] ecBlocks;
-
-         internal ECBlocks(int ecCodewordsPerBlock, params ECB[] ecBlocks)
-         {
-            this.ecCodewordsPerBlock = ecCodewordsPerBlock;
-            this.ecBlocks = ecBlocks;
-         }
-
-         /// <summary>
-         /// Gets the EC codewords per block.
-         /// </summary>
-         public int ECCodewordsPerBlock
-         {
-            get
-            {
-               return ecCodewordsPerBlock;
-            }
-         }
-
-         /// <summary>
-         /// Gets the num blocks.
-         /// </summary>
-         public int NumBlocks
-         {
-            get
-            {
-               int total = 0;
-               foreach (var ecBlock in ecBlocks)
-               {
-                  total += ecBlock.Count;
-               }
-               return total;
-            }
-         }
-
-         /// <summary>
-         /// Gets the total EC codewords.
-         /// </summary>
-         public int TotalECCodewords
-         {
-            get
-            {
-               return ecCodewordsPerBlock * NumBlocks;
-            }
-         }
-
-         /// <summary>
-         /// Gets the EC blocks.
-         /// </summary>
-         /// <returns></returns>
-         public ECB[] getECBlocks()
-         {
-            return ecBlocks;
-         }
-      }
-
-      /// <summary> <p>Encapsualtes the parameters for one error-correction block in one symbol version.
-      /// This includes the number of data codewords, and the number of times a block with these
-      /// parameters is used consecutively in the QR code version's format.</p>
-      /// </summary>
-      public sealed class ECB
-      {
-         private readonly int count;
-         private readonly int dataCodewords;
-
-         internal ECB(int count, int dataCodewords)
-         {
-            this.count = count;
-            this.dataCodewords = dataCodewords;
-         }
-
-         /// <summary>
-         /// Gets the count.
-         /// </summary>
-         public int Count
-         {
-            get
-            {
-               return count;
-            }
-
-         }
-         /// <summary>
-         /// Gets the data codewords.
-         /// </summary>
-         public int DataCodewords
-         {
-            get
-            {
-               return dataCodewords;
-            }
-
-         }
-      }
-
-      /// <summary>
-      /// Returns a <see cref="System.String"/> that represents this instance.
-      /// </summary>
-      /// <returns>
-      /// A <see cref="System.String"/> that represents this instance.
-      /// </returns>
-      public override String ToString()
-      {
-         return Convert.ToString(versionNumber);
-      }
-
-      /// <summary> See ISO 18004:2006 6.5.1 Table 9</summary>
-      private static Version[] buildVersions()
-      {
-         return new Version[]
-            {
-               new Version(1, new int[] {},
-                           new ECBlocks(7, new ECB(1, 19)),
-                           new ECBlocks(10, new ECB(1, 16)),
-                           new ECBlocks(13, new ECB(1, 13)),
-                           new ECBlocks(17, new ECB(1, 9))),
-               new Version(2, new int[] {6, 18},
-                           new ECBlocks(10, new ECB(1, 34)),
-                           new ECBlocks(16, new ECB(1, 28)),
-                           new ECBlocks(22, new ECB(1, 22)),
-                           new ECBlocks(28, new ECB(1, 16))),
-               new Version(3, new int[] {6, 22},
-                           new ECBlocks(15, new ECB(1, 55)),
-                           new ECBlocks(26, new ECB(1, 44)),
-                           new ECBlocks(18, new ECB(2, 17)),
-                           new ECBlocks(22, new ECB(2, 13))),
-               new Version(4, new int[] {6, 26},
-                           new ECBlocks(20, new ECB(1, 80)),
-                           new ECBlocks(18, new ECB(2, 32)),
-                           new ECBlocks(26, new ECB(2, 24)),
-                           new ECBlocks(16, new ECB(4, 9))),
-               new Version(5, new int[] {6, 30},
-                           new ECBlocks(26, new ECB(1, 108)),
-                           new ECBlocks(24, new ECB(2, 43)),
-                           new ECBlocks(18, new ECB(2, 15),
-                                        new ECB(2, 16)),
-                           new ECBlocks(22, new ECB(2, 11),
-                                        new ECB(2, 12))),
-               new Version(6, new int[] {6, 34},
-                           new ECBlocks(18, new ECB(2, 68)),
-                           new ECBlocks(16, new ECB(4, 27)),
-                           new ECBlocks(24, new ECB(4, 19)),
-                           new ECBlocks(28, new ECB(4, 15))),
-               new Version(7, new int[] {6, 22, 38},
-                           new ECBlocks(20, new ECB(2, 78)),
-                           new ECBlocks(18, new ECB(4, 31)),
-                           new ECBlocks(18, new ECB(2, 14),
-                                        new ECB(4, 15)),
-                           new ECBlocks(26, new ECB(4, 13),
-                                        new ECB(1, 14))),
-               new Version(8, new int[] {6, 24, 42},
-                           new ECBlocks(24, new ECB(2, 97)),
-                           new ECBlocks(22, new ECB(2, 38),
-                                        new ECB(2, 39)),
-                           new ECBlocks(22, new ECB(4, 18),
-                                        new ECB(2, 19)),
-                           new ECBlocks(26, new ECB(4, 14),
-                                        new ECB(2, 15))),
-               new Version(9, new int[] {6, 26, 46},
-                           new ECBlocks(30, new ECB(2, 116)),
-                           new ECBlocks(22, new ECB(3, 36),
-                                        new ECB(2, 37)),
-                           new ECBlocks(20, new ECB(4, 16),
-                                        new ECB(4, 17)),
-                           new ECBlocks(24, new ECB(4, 12),
-                                        new ECB(4, 13))),
-               new Version(10, new int[] {6, 28, 50},
-                           new ECBlocks(18, new ECB(2, 68),
-                                        new ECB(2, 69)),
-                           new ECBlocks(26, new ECB(4, 43),
-                                        new ECB(1, 44)),
-                           new ECBlocks(24, new ECB(6, 19),
-                                        new ECB(2, 20)),
-                           new ECBlocks(28, new ECB(6, 15),
-                                        new ECB(2, 16))),
-               new Version(11, new int[] {6, 30, 54},
-                           new ECBlocks(20, new ECB(4, 81)),
-                           new ECBlocks(30, new ECB(1, 50),
-                                        new ECB(4, 51)),
-                           new ECBlocks(28, new ECB(4, 22),
-                                        new ECB(4, 23)),
-                           new ECBlocks(24, new ECB(3, 12),
-                                        new ECB(8, 13))),
-               new Version(12, new int[] {6, 32, 58},
-                           new ECBlocks(24, new ECB(2, 92),
-                                        new ECB(2, 93)),
-                           new ECBlocks(22, new ECB(6, 36),
-                                        new ECB(2, 37)),
-                           new ECBlocks(26, new ECB(4, 20),
-                                        new ECB(6, 21)),
-                           new ECBlocks(28, new ECB(7, 14),
-                                        new ECB(4, 15))),
-               new Version(13, new int[] {6, 34, 62},
-                           new ECBlocks(26, new ECB(4, 107)),
-                           new ECBlocks(22, new ECB(8, 37),
-                                        new ECB(1, 38)),
-                           new ECBlocks(24, new ECB(8, 20),
-                                        new ECB(4, 21)),
-                           new ECBlocks(22, new ECB(12, 11),
-                                        new ECB(4, 12))),
-               new Version(14, new int[] {6, 26, 46, 66},
-                           new ECBlocks(30, new ECB(3, 115),
-                                        new ECB(1, 116)),
-                           new ECBlocks(24, new ECB(4, 40),
-                                        new ECB(5, 41)),
-                           new ECBlocks(20, new ECB(11, 16),
-                                        new ECB(5, 17)),
-                           new ECBlocks(24, new ECB(11, 12),
-                                        new ECB(5, 13))),
-               new Version(15, new int[] {6, 26, 48, 70},
-                           new ECBlocks(22, new ECB(5, 87),
-                                        new ECB(1, 88)),
-                           new ECBlocks(24, new ECB(5, 41),
-                                        new ECB(5, 42)),
-                           new ECBlocks(30, new ECB(5, 24),
-                                        new ECB(7, 25)),
-                           new ECBlocks(24, new ECB(11, 12),
-                                        new ECB(7, 13)))
-            };
-      }
-   }
-}

shadowsocks-csharp/3rd/zxing/WriterException.cs

@@ -0,0 +1,55 @@
+/*
+* Copyright 2008 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+
+namespace ZXing
+{
+	/// <summary>
+	/// A base class which covers the range of exceptions which may occur when encoding a barcode using
+	/// the Writer framework.
+	/// </summary>
+	/// <author>dswitkin@google.com (Daniel Switkin)</author>
+	[Serializable]
+	public sealed class WriterException : Exception
+	{
+      /// <summary>
+      /// Initializes a new instance of the <see cref="WriterException"/> class.
+      /// </summary>
+		public WriterException()
+		{
+		}
+
+      /// <summary>
+      /// Initializes a new instance of the <see cref="WriterException"/> class.
+      /// </summary>
+      /// <param name="message">The message.</param>
+      public WriterException(String message)
+         :base(message)
+		{
+		}
+
+      /// <summary>
+      /// Initializes a new instance of the <see cref="WriterException"/> class.
+      /// </summary>
+      /// <param name="message">The message.</param>
+      /// <param name="innerExc">The inner exc.</param>
+      public WriterException(String message, Exception innerExc)
+         : base(message, innerExc)
+      {
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/BitArray.cs → shadowsocks-csharp/3rd/zxing/common/BitArray.cs

@@ -49,6 +49,11 @@ namespace ZXing.Common
          {
             return (bits[i >> 5] & (1 << (i & 0x1F))) != 0;
          }
+         set
+         {
+            if (value)
+               bits[i >> 5] |= 1 << (i & 0x1F);
+         }
       }
 
       public BitArray()
@@ -57,6 +62,22 @@ namespace ZXing.Common
          this.bits = new int[1];
       }
 
+      public BitArray(int size)
+      {
+         if (size < 1)
+         {
+            throw new ArgumentException("size must be at least 1");
+         }
+         this.size = size;
+         this.bits = makeArray(size);
+      }
+
+      // For testing only
+      private BitArray(int[] bits, int size)
+      {
+         this.bits = bits;
+         this.size = size;
+      }
 
       private void ensureCapacity(int size)
       {
@@ -68,6 +89,46 @@ namespace ZXing.Common
          }
       }
 
+
+      private static int numberOfTrailingZeros(int num)
+      {
+         var index = (-num & num)%37;
+         if (index < 0)
+            index *= -1;
+         return _lookup[index];
+      }
+
+      private static readonly int[] _lookup =
+         {
+            32, 0, 1, 26, 2, 23, 27, 0, 3, 16, 24, 30, 28, 11, 0, 13, 4, 7, 17,
+            0, 25, 22, 31, 15, 29, 10, 12, 6, 0, 21, 14, 9, 5, 20, 8, 19, 18
+         };
+
+
+      /// <summary> Sets a block of 32 bits, starting at bit i.
+      /// 
+      /// </summary>
+      /// <param name="i">first bit to set
+      /// </param>
+      /// <param name="newBits">the new value of the next 32 bits. Note again that the least-significant bit
+      /// corresponds to bit i, the next-least-significant to i+1, and so on.
+      /// </param>
+      public void setBulk(int i, int newBits)
+      {
+         bits[i >> 5] = newBits;
+      }
+
+
+      /// <summary> Clears all bits (sets to false).</summary>
+      public void clear()
+      {
+         int max = bits.Length;
+         for (int i = 0; i < max; i++)
+         {
+            bits[i] = 0;
+         }
+      }
+
       /// <summary>
       /// Appends the bit.
       /// </summary>
@@ -82,13 +143,21 @@ namespace ZXing.Common
          size++;
       }
 
+      /// <returns> underlying array of ints. The first element holds the first 32 bits, and the least
+      /// significant bit is bit 0.
+      /// </returns>
+      public int[] Array
+      {
+         get { return bits; }
+      }
+
       /// <summary>
       /// Appends the least-significant bits, from value, in order from most-significant to
       /// least-significant. For example, appending 6 bits from 0x000001E will append the bits
       /// 0, 1, 1, 1, 1, 0 in that order.
       /// </summary>
-      /// <param name="value"><see cref="int"/> containing bits to append</param>
-      /// <param name="numBits">bits from value to append</param>
+      /// <param name="value">The value.</param>
+      /// <param name="numBits">The num bits.</param>
       public void appendBits(int value, int numBits)
       {
          if (numBits < 0 || numBits > 32)
@@ -156,5 +225,54 @@ namespace ZXing.Common
          return new int[(size + 31) >> 5];
       }
 
+      /// <summary>
+      /// Determines whether the specified <see cref="System.Object"/> is equal to this instance.
+      /// </summary>
+      /// <param name="o">The <see cref="System.Object"/> to compare with this instance.</param>
+      /// <returns>
+      ///   <c>true</c> if the specified <see cref="System.Object"/> is equal to this instance; otherwise, <c>false</c>.
+      /// </returns>
+      public override bool Equals(Object o)
+      {
+         var other = o as BitArray;
+         if (other == null)
+            return false;
+         if (size != other.size)
+            return false;
+         for (var index = 0; index < size; index++)
+         {
+            if (bits[index] != other.bits[index])
+               return false;
+         }
+         return true;
+      }
+
+      /// <summary>
+      /// Returns a hash code for this instance.
+      /// </summary>
+      /// <returns>
+      /// A hash code for this instance, suitable for use in hashing algorithms and data structures like a hash table. 
+      /// </returns>
+      public override int GetHashCode()
+      {
+         var hash = size;
+         foreach (var bit in bits)
+         {
+            hash = 31 * hash + bit.GetHashCode();
+         }
+         return hash;
+      }
+
+
+      /// <summary>
+      /// Erstellt ein neues Objekt, das eine Kopie der aktuellen Instanz darstellt.
+      /// </summary>
+      /// <returns>
+      /// Ein neues Objekt, das eine Kopie dieser Instanz darstellt.
+      /// </returns>
+      public object Clone()
+      {
+         return new BitArray((int[])bits.Clone(), size);
+      }
    }
 }

shadowsocks-csharp/3rd/zxing/common/BitMatrix.cs

@@ -0,0 +1,259 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+
+namespace ZXing.Common
+{
+   /// <summary>
+   ///   <p>Represents a 2D matrix of bits. In function arguments below, and throughout the common
+   /// module, x is the column position, and y is the row position. The ordering is always x, y.
+   /// The origin is at the top-left.</p>
+   ///   <p>Internally the bits are represented in a 1-D array of 32-bit ints. However, each row begins
+   /// with a new int. This is done intentionally so that we can copy out a row into a BitArray very
+   /// efficiently.</p>
+   ///   <p>The ordering of bits is row-major. Within each int, the least significant bits are used first,
+   /// meaning they represent lower x values. This is compatible with BitArray's implementation.</p>
+   /// </summary>
+   /// <author>Sean Owen</author>
+   /// <author>dswitkin@google.com (Daniel Switkin)</author>
+   public sealed partial class BitMatrix
+   {
+      private readonly int width;
+      private readonly int height;
+      private readonly int rowSize;
+      private readonly int[] bits;
+
+      /// <returns> The width of the matrix
+      /// </returns>
+      public int Width
+      {
+         get
+         {
+            return width;
+         }
+
+      }
+      /// <returns> The height of the matrix
+      /// </returns>
+      public int Height
+      {
+         get
+         {
+            return height;
+         }
+
+      }
+
+      // A helper to construct a square matrix.
+      public BitMatrix(int dimension)
+         : this(dimension, dimension)
+      {
+      }
+
+      public BitMatrix(int width, int height)
+      {
+         if (width < 1 || height < 1)
+         {
+            throw new System.ArgumentException("Both dimensions must be greater than 0");
+         }
+         this.width = width;
+         this.height = height;
+         this.rowSize = (width + 31) >> 5;
+         bits = new int[rowSize * height];
+      }
+
+      private BitMatrix(int width, int height, int rowSize, int[] bits)
+      {
+         this.width = width;
+         this.height = height;
+         this.rowSize = rowSize;
+         this.bits = bits;
+      }
+
+      /// <summary> <p>Gets the requested bit, where true means black.</p>
+      /// 
+      /// </summary>
+      /// <param name="x">The horizontal component (i.e. which column)
+      /// </param>
+      /// <param name="y">The vertical component (i.e. which row)
+      /// </param>
+      /// <returns> value of given bit in matrix
+      /// </returns>
+      public bool this[int x, int y]
+      {
+         get
+         {
+            int offset = y * rowSize + (x >> 5);
+            return (((int)((uint)(bits[offset]) >> (x & 0x1f))) & 1) != 0;
+         }
+         set
+         {
+            if (value)
+            {
+               int offset = y * rowSize + (x >> 5);
+               bits[offset] |= 1 << (x & 0x1f);
+            }
+         }
+      }
+
+      /// <summary> <p>Flips the given bit.</p>
+      /// 
+      /// </summary>
+      /// <param name="x">The horizontal component (i.e. which column)
+      /// </param>
+      /// <param name="y">The vertical component (i.e. which row)
+      /// </param>
+      public void flip(int x, int y)
+      {
+         int offset = y * rowSize + (x >> 5);
+         bits[offset] ^= 1 << (x & 0x1f);
+      }
+
+
+      /// <summary> <p>Sets a square region of the bit matrix to true.</p>
+      /// 
+      /// </summary>
+      /// <param name="left">The horizontal position to begin at (inclusive)
+      /// </param>
+      /// <param name="top">The vertical position to begin at (inclusive)
+      /// </param>
+      /// <param name="width">The width of the region
+      /// </param>
+      /// <param name="height">The height of the region
+      /// </param>
+      public void setRegion(int left, int top, int width, int height)
+      {
+         if (top < 0 || left < 0)
+         {
+            throw new System.ArgumentException("Left and top must be nonnegative");
+         }
+         if (height < 1 || width < 1)
+         {
+            throw new System.ArgumentException("Height and width must be at least 1");
+         }
+         int right = left + width;
+         int bottom = top + height;
+         if (bottom > this.height || right > this.width)
+         {
+            throw new System.ArgumentException("The region must fit inside the matrix");
+         }
+         for (int y = top; y < bottom; y++)
+         {
+            int offset = y * rowSize;
+            for (int x = left; x < right; x++)
+            {
+               bits[offset + (x >> 5)] |= 1 << (x & 0x1f);
+            }
+         }
+      }
+
+      /// <summary> A fast method to retrieve one row of data from the matrix as a BitArray.
+      /// 
+      /// </summary>
+      /// <param name="y">The row to retrieve
+      /// </param>
+      /// <param name="row">An optional caller-allocated BitArray, will be allocated if null or too small
+      /// </param>
+      /// <returns> The resulting BitArray - this reference should always be used even when passing
+      /// your own row
+      /// </returns>
+      public BitArray getRow(int y, BitArray row)
+      {
+         if (row == null || row.Size < width)
+         {
+            row = new BitArray(width);
+         }
+         else
+         {
+            row.clear();
+         }
+         int offset = y * rowSize;
+         for (int x = 0; x < rowSize; x++)
+         {
+            row.setBulk(x << 5, bits[offset + x]);
+         }
+         return row;
+      }
+
+      /// <summary>
+      /// Sets the row.
+      /// </summary>
+      /// <param name="y">row to set</param>
+      /// <param name="row">{@link BitArray} to copy from</param>
+      public void setRow(int y, BitArray row)
+      {
+         Array.Copy(row.Array, 0, bits, y * rowSize, rowSize);
+      }
+
+
+      /// <summary>
+      /// This is useful in detecting a corner of a 'pure' barcode.
+      /// </summary>
+      /// <returns>{x,y} coordinate of top-left-most 1 bit, or null if it is all white</returns>
+      public int[] getTopLeftOnBit()
+      {
+         int bitsOffset = 0;
+         while (bitsOffset < bits.Length && bits[bitsOffset] == 0)
+         {
+            bitsOffset++;
+         }
+         if (bitsOffset == bits.Length)
+         {
+            return null;
+         }
+         int y = bitsOffset / rowSize;
+         int x = (bitsOffset % rowSize) << 5;
+
+         int theBits = bits[bitsOffset];
+         int bit = 0;
+         while ((theBits << (31 - bit)) == 0)
+         {
+            bit++;
+         }
+         x += bit;
+         return new[] { x, y };
+      }
+
+      public int[] getBottomRightOnBit()
+      {
+         int bitsOffset = bits.Length - 1;
+         while (bitsOffset >= 0 && bits[bitsOffset] == 0)
+         {
+            bitsOffset--;
+         }
+         if (bitsOffset < 0)
+         {
+            return null;
+         }
+
+         int y = bitsOffset / rowSize;
+         int x = (bitsOffset % rowSize) << 5;
+
+         int theBits = bits[bitsOffset];
+         int bit = 31;
+
+         while (((int)((uint)theBits >> bit)) == 0) // (theBits >>> bit)
+         {
+            bit--;
+         }
+         x += bit;
+
+         return new int[] { x, y };
+      }
+
+   }
+}

shadowsocks-csharp/3rd/zxing/common/BitSource.cs

@@ -0,0 +1,124 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+
+namespace ZXing.Common
+{
+   /// <summary> <p>This provides an easy abstraction to read bits at a time from a sequence of bytes, where the
+   /// number of bits read is not often a multiple of 8.</p>
+   /// 
+   /// <p>This class is thread-safe but not reentrant. Unless the caller modifies the bytes array
+   /// it passed in, in which case all bets are off.</p>
+   /// 
+   /// </summary>
+   /// <author>  Sean Owen
+   /// </author>
+   /// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source 
+   /// </author>
+   public sealed class BitSource
+   {
+      private readonly byte[] bytes;
+      private int byteOffset;
+      private int bitOffset;
+
+      /// <param name="bytes">bytes from which this will read bits. Bits will be read from the first byte first.
+      /// Bits are read within a byte from most-significant to least-significant bit.
+      /// </param>
+      public BitSource(byte[] bytes)
+      {
+         this.bytes = bytes;
+      }
+
+      /// <summary>
+      /// index of next bit in current byte which would be read by the next call to {@link #readBits(int)}.
+      /// </summary>
+      public int BitOffset
+      {
+         get { return bitOffset; }
+      }
+  
+      /// <summary>
+      /// index of next byte in input byte array which would be read by the next call to {@link #readBits(int)}.
+      /// </summary>
+      public int ByteOffset
+      {
+         get { return byteOffset; }
+      }
+
+      /// <param name="numBits">number of bits to read
+      /// </param>
+      /// <returns> int representing the bits read. The bits will appear as the least-significant
+      /// bits of the int
+      /// </returns>
+      /// <exception cref="ArgumentException">if numBits isn't in [1,32] or more than is available</exception>
+      public int readBits(int numBits)
+      {
+         if (numBits < 1 || numBits > 32 || numBits > available())
+         {
+            throw new ArgumentException(numBits.ToString(), "numBits");
+         }
+
+         int result = 0;
+
+         // First, read remainder from current byte
+         if (bitOffset > 0)
+         {
+            int bitsLeft = 8 - bitOffset;
+            int toRead = numBits < bitsLeft ? numBits : bitsLeft;
+            int bitsToNotRead = bitsLeft - toRead;
+            int mask = (0xFF >> (8 - toRead)) << bitsToNotRead;
+            result = (bytes[byteOffset] & mask) >> bitsToNotRead;
+            numBits -= toRead;
+            bitOffset += toRead;
+            if (bitOffset == 8)
+            {
+               bitOffset = 0;
+               byteOffset++;
+            }
+         }
+
+         // Next read whole bytes
+         if (numBits > 0)
+         {
+            while (numBits >= 8)
+            {
+               result = (result << 8) | (bytes[byteOffset] & 0xFF);
+               byteOffset++;
+               numBits -= 8;
+            }
+
+            // Finally read a partial byte
+            if (numBits > 0)
+            {
+               int bitsToNotRead = 8 - numBits;
+               int mask = (0xFF >> bitsToNotRead) << bitsToNotRead;
+               result = (result << numBits) | ((bytes[byteOffset] & mask) >> bitsToNotRead);
+               bitOffset += numBits;
+            }
+         }
+
+         return result;
+      }
+
+      /// <returns> number of bits that can be read successfully
+      /// </returns>
+      public int available()
+      {
+         return 8 * (bytes.Length - byteOffset) - bitOffset;
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/common/DecoderResult.cs

@@ -0,0 +1,76 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+using System.Collections.Generic;
+
+namespace ZXing.Common
+{
+   /// <summary>
+   /// Encapsulates the result of decoding a matrix of bits. This typically
+   /// applies to 2D barcode formats. For now it contains the raw bytes obtained,
+   /// as well as a String interpretation of those bytes, if applicable.
+   /// <author>Sean Owen</author>
+   /// </summary>
+   public sealed class DecoderResult
+   {
+      public byte[] RawBytes { get; private set; }
+
+      public String Text { get; private set; }
+
+      public IList<byte[]> ByteSegments { get; private set; }
+
+      public String ECLevel { get; private set; }
+
+      public bool StructuredAppend
+      {
+         get { return StructuredAppendParity >= 0 && StructuredAppendSequenceNumber >= 0; }
+      }
+
+      public int ErrorsCorrected { get; set; }
+
+      public int StructuredAppendSequenceNumber { get; private set; }
+
+      public int Erasures { get; set; }
+
+      public int StructuredAppendParity { get; private set; }
+
+      /// <summary>
+      /// Miscellanseous data value for the various decoders
+      /// </summary>
+      /// <value>The other.</value>
+      public object Other { get; set; }
+
+      public DecoderResult(byte[] rawBytes, String text, IList<byte[]> byteSegments, String ecLevel)
+         : this(rawBytes, text, byteSegments, ecLevel, -1, -1)
+      {
+      }
+
+      public DecoderResult(byte[] rawBytes, String text, IList<byte[]> byteSegments, String ecLevel, int saSequence, int saParity)
+      {
+         if (rawBytes == null && text == null)
+         {
+            throw new ArgumentException();
+         }
+         RawBytes = rawBytes;
+         Text = text;
+         ByteSegments = byteSegments;
+         ECLevel = ecLevel;
+         StructuredAppendParity = saParity;
+         StructuredAppendSequenceNumber = saSequence;
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/common/DefaultGridSampler.cs

@@ -0,0 +1,82 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+using System;
+
+namespace ZXing.Common
+{
+
+   /// <author>  Sean Owen
+   /// </author>
+   /// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source 
+   /// </author>
+   public sealed class DefaultGridSampler : GridSampler
+   {
+      public override BitMatrix sampleGrid(BitMatrix image, int dimensionX, int dimensionY, float p1ToX, float p1ToY, float p2ToX, float p2ToY, float p3ToX, float p3ToY, float p4ToX, float p4ToY, float p1FromX, float p1FromY, float p2FromX, float p2FromY, float p3FromX, float p3FromY, float p4FromX, float p4FromY)
+      {
+         PerspectiveTransform transform = PerspectiveTransform.quadrilateralToQuadrilateral(
+            p1ToX, p1ToY, p2ToX, p2ToY, p3ToX, p3ToY, p4ToX, p4ToY, 
+            p1FromX, p1FromY, p2FromX, p2FromY, p3FromX, p3FromY, p4FromX, p4FromY);
+         return sampleGrid(image, dimensionX, dimensionY, transform);
+      }
+
+      public override BitMatrix sampleGrid(BitMatrix image, int dimensionX, int dimensionY, PerspectiveTransform transform)
+      {
+         if (dimensionX <= 0 || dimensionY <= 0)
+         {
+            return null;
+         }
+         BitMatrix bits = new BitMatrix(dimensionX, dimensionY);
+         float[] points = new float[dimensionX << 1];
+         for (int y = 0; y < dimensionY; y++)
+         {
+            int max = points.Length;
+            //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+            float iValue = (float)y + 0.5f;
+            for (int x = 0; x < max; x += 2)
+            {
+               //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+               points[x] = (float)(x >> 1) + 0.5f;
+               points[x + 1] = iValue;
+            }
+            transform.transformPoints(points);
+            // Quick check to see if points transformed to something inside the image;
+            // sufficient to check the endpoints
+            if (!checkAndNudgePoints(image, points))
+               return null;
+            try
+            {
+               for (int x = 0; x < max; x += 2)
+               {
+                  //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+                  bits[x >> 1, y] = image[(int)points[x], (int)points[x + 1]];
+               }
+            }
+            catch (System.IndexOutOfRangeException)
+            {
+               // This feels wrong, but, sometimes if the finder patterns are misidentified, the resulting
+               // transform gets "twisted" such that it maps a straight line of points to a set of points
+               // whose endpoints are in bounds, but others are not. There is probably some mathematical
+               // way to detect this about the transformation that I don't know yet.
+               // This results in an ugly runtime exception despite our clever checks above -- can't have
+               // that. We could check each point's coordinates but that feels duplicative. We settle for
+               // catching and wrapping ArrayIndexOutOfBoundsException.
+               return null;
+            }
+         }
+         return bits;
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/common/DetectorResult.cs

@@ -0,0 +1,39 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+namespace ZXing.Common
+{
+   /// <summary> <p>Encapsulates the result of detecting a barcode in an image. This includes the raw
+   /// matrix of black/white pixels corresponding to the barcode, and possibly points of interest
+   /// in the image, like the location of finder patterns or corners of the barcode in the image.</p>
+   /// 
+   /// </summary>
+   /// <author>  Sean Owen
+   /// </author>
+   /// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source 
+   /// </author>
+   public class DetectorResult
+   {
+      public BitMatrix Bits { get; private set; }
+      public ResultPoint[] Points { get; private set; }
+
+      public DetectorResult(BitMatrix bits, ResultPoint[] points)
+      {
+         Bits = bits;
+         Points = points;
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/common/GlobalHistogramBinarizer.cs

@@ -0,0 +1,243 @@
+/*
+* Copyright 2009 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+namespace ZXing.Common
+{
+   /// <summary> This Binarizer implementation uses the old ZXing global histogram approach. It is suitable
+   /// for low-end mobile devices which don't have enough CPU or memory to use a local thresholding
+   /// algorithm. However, because it picks a global black point, it cannot handle difficult shadows
+   /// and gradients.
+   /// 
+   /// Faster mobile devices and all desktop applications should probably use HybridBinarizer instead.
+   /// 
+   /// <author>dswitkin@google.com (Daniel Switkin)</author>
+   /// <author>Sean Owen</author>
+   /// </summary>
+   public class GlobalHistogramBinarizer : Binarizer
+   {
+      private const int LUMINANCE_BITS = 5;
+      private const int LUMINANCE_SHIFT = 8 - LUMINANCE_BITS;
+      private const int LUMINANCE_BUCKETS = 1 << LUMINANCE_BITS;
+      private static readonly byte[] EMPTY = new byte[0];
+
+      private byte[] luminances;
+      private readonly int[] buckets;
+
+      /// <summary>
+      /// Initializes a new instance of the <see cref="GlobalHistogramBinarizer"/> class.
+      /// </summary>
+      /// <param name="source">The source.</param>
+      public GlobalHistogramBinarizer(LuminanceSource source)
+         : base(source)
+      {
+         luminances = EMPTY;
+         buckets = new int[LUMINANCE_BUCKETS];
+      }
+
+      /// <summary>
+      /// Applies simple sharpening to the row data to improve performance of the 1D Readers.
+      /// </summary>
+      /// <param name="y"></param>
+      /// <param name="row"></param>
+      /// <returns></returns>
+      public override BitArray getBlackRow(int y, BitArray row)
+      {
+         LuminanceSource source = LuminanceSource;
+         int width = source.Width;
+         if (row == null || row.Size < width)
+         {
+            row = new BitArray(width);
+         }
+         else
+         {
+            row.clear();
+         }
+
+         initArrays(width);
+         byte[] localLuminances = source.getRow(y, luminances);
+         int[] localBuckets = buckets;
+         for (int x = 0; x < width; x++)
+         {
+            int pixel = localLuminances[x] & 0xff;
+            localBuckets[pixel >> LUMINANCE_SHIFT]++;
+         }
+         int blackPoint;
+         if (!estimateBlackPoint(localBuckets, out blackPoint))
+            return null;
+
+         int left = localLuminances[0] & 0xff;
+         int center = localLuminances[1] & 0xff;
+         for (int x = 1; x < width - 1; x++)
+         {
+            int right = localLuminances[x + 1] & 0xff;
+            // A simple -1 4 -1 box filter with a weight of 2.
+            int luminance = ((center << 2) - left - right) >> 1;
+            row[x] = (luminance < blackPoint);
+            left = center;
+            center = right;
+         }
+         return row;
+      }
+
+      /// <summary>
+      /// Does not sharpen the data, as this call is intended to only be used by 2D Readers.
+      /// </summary>
+      override public BitMatrix BlackMatrix
+      {
+         get
+         {
+            LuminanceSource source = LuminanceSource;
+            byte[] localLuminances;
+
+            int width = source.Width;
+            int height = source.Height;
+            BitMatrix matrix = new BitMatrix(width, height);
+
+            // Quickly calculates the histogram by sampling four rows from the image. This proved to be
+            // more robust on the blackbox tests than sampling a diagonal as we used to do.
+            initArrays(width);
+            int[] localBuckets = buckets;
+            for (int y = 1; y < 5; y++)
+            {
+               int row = height * y / 5;
+               localLuminances = source.getRow(row, luminances);
+               int right = (width << 2) / 5;
+               for (int x = width / 5; x < right; x++)
+               {
+                  int pixel = localLuminances[x] & 0xff;
+                  localBuckets[pixel >> LUMINANCE_SHIFT]++;
+               }
+            }
+            int blackPoint;
+            if (!estimateBlackPoint(localBuckets, out blackPoint))
+               return null;
+
+            // We delay reading the entire image luminance until the black point estimation succeeds.
+            // Although we end up reading four rows twice, it is consistent with our motto of
+            // "fail quickly" which is necessary for continuous scanning.
+            localLuminances = source.Matrix;
+            for (int y = 0; y < height; y++)
+            {
+               int offset = y * width;
+               for (int x = 0; x < width; x++)
+               {
+                  int pixel = localLuminances[offset + x] & 0xff;
+                  matrix[x, y] = (pixel < blackPoint);
+               }
+            }
+
+            return matrix;
+         }
+      }
+
+      /// <summary>
+      /// Creates a new object with the same type as this Binarizer implementation, but with pristine
+      /// state. This is needed because Binarizer implementations may be stateful, e.g. keeping a cache
+      /// of 1 bit data. See Effective Java for why we can't use Java's clone() method.
+      /// </summary>
+      /// <param name="source">The LuminanceSource this Binarizer will operate on.</param>
+      /// <returns>
+      /// A new concrete Binarizer implementation object.
+      /// </returns>
+      public override Binarizer createBinarizer(LuminanceSource source)
+      {
+         return new GlobalHistogramBinarizer(source);
+      }
+
+      private void initArrays(int luminanceSize)
+      {
+         if (luminances.Length < luminanceSize)
+         {
+            luminances = new byte[luminanceSize];
+         }
+         for (int x = 0; x < LUMINANCE_BUCKETS; x++)
+         {
+            buckets[x] = 0;
+         }
+      }
+
+      private static bool estimateBlackPoint(int[] buckets, out int blackPoint)
+      {
+         blackPoint = 0;
+         // Find the tallest peak in the histogram.
+         int numBuckets = buckets.Length;
+         int maxBucketCount = 0;
+         int firstPeak = 0;
+         int firstPeakSize = 0;
+         for (int x = 0; x < numBuckets; x++)
+         {
+            if (buckets[x] > firstPeakSize)
+            {
+               firstPeak = x;
+               firstPeakSize = buckets[x];
+            }
+            if (buckets[x] > maxBucketCount)
+            {
+               maxBucketCount = buckets[x];
+            }
+         }
+
+         // Find the second-tallest peak which is somewhat far from the tallest peak.
+         int secondPeak = 0;
+         int secondPeakScore = 0;
+         for (int x = 0; x < numBuckets; x++)
+         {
+            int distanceToBiggest = x - firstPeak;
+            // Encourage more distant second peaks by multiplying by square of distance.
+            int score = buckets[x] * distanceToBiggest * distanceToBiggest;
+            if (score > secondPeakScore)
+            {
+               secondPeak = x;
+               secondPeakScore = score;
+            }
+         }
+
+         // Make sure firstPeak corresponds to the black peak.
+         if (firstPeak > secondPeak)
+         {
+            int temp = firstPeak;
+            firstPeak = secondPeak;
+            secondPeak = temp;
+         }
+
+         // If there is too little contrast in the image to pick a meaningful black point, throw rather
+         // than waste time trying to decode the image, and risk false positives.
+         // TODO: It might be worth comparing the brightest and darkest pixels seen, rather than the
+         // two peaks, to determine the contrast.
+         if (secondPeak - firstPeak <= numBuckets >> 4)
+         {
+            return false;
+         }
+
+         // Find a valley between them that is low and closer to the white peak.
+         int bestValley = secondPeak - 1;
+         int bestValleyScore = -1;
+         for (int x = secondPeak - 1; x > firstPeak; x--)
+         {
+            int fromFirst = x - firstPeak;
+            int score = fromFirst*fromFirst*(secondPeak - x)*(maxBucketCount - buckets[x]);
+            if (score > bestValleyScore)
+            {
+               bestValley = x;
+               bestValleyScore = score;
+            }
+         }
+
+         blackPoint = bestValley << LUMINANCE_SHIFT;
+         return true;
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/common/GridSampler.cs

@@ -0,0 +1,192 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+namespace ZXing.Common
+{
+   /// <summary> Implementations of this class can, given locations of finder patterns for a QR code in an
+   /// image, sample the right points in the image to reconstruct the QR code, accounting for
+   /// perspective distortion. It is abstracted since it is relatively expensive and should be allowed
+   /// to take advantage of platform-specific optimized implementations, like Sun's Java Advanced
+   /// Imaging library, but which may not be available in other environments such as J2ME, and vice
+   /// versa.
+   /// 
+   /// The implementation used can be controlled by calling {@link #setGridSampler(GridSampler)}
+   /// with an instance of a class which implements this interface.
+   /// 
+   /// </summary>
+   /// <author>  Sean Owen
+   /// </author>
+   /// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source 
+   /// </author>
+   public abstract class GridSampler
+   {
+      /// <returns> the current implementation of {@link GridSampler}
+      /// </returns>
+      public static GridSampler Instance
+      {
+         get
+         {
+            return gridSampler;
+         }
+
+      }
+
+      private static GridSampler gridSampler = new DefaultGridSampler();
+
+      /// <summary> Sets the implementation of {@link GridSampler} used by the library. One global
+      /// instance is stored, which may sound problematic. But, the implementation provided
+      /// ought to be appropriate for the entire platform, and all uses of this library
+      /// in the whole lifetime of the JVM. For instance, an Android activity can swap in
+      /// an implementation that takes advantage of native platform libraries.
+      /// 
+      /// </summary>
+      /// <param name="newGridSampler">The platform-specific object to install.
+      /// </param>
+      public static void setGridSampler(GridSampler newGridSampler)
+      {
+         if (newGridSampler == null)
+         {
+            throw new System.ArgumentException();
+         }
+         gridSampler = newGridSampler;
+      }
+
+      /// <summary> <p>Samples an image for a square matrix of bits of the given dimension. This is used to extract
+      /// the black/white modules of a 2D barcode like a QR Code found in an image. Because this barcode
+      /// may be rotated or perspective-distorted, the caller supplies four points in the source image
+      /// that define known points in the barcode, so that the image may be sampled appropriately.</p>
+      /// 
+      /// <p>The last eight "from" parameters are four X/Y coordinate pairs of locations of points in
+      /// the image that define some significant points in the image to be sample. For example,
+      /// these may be the location of finder pattern in a QR Code.</p>
+      /// 
+      /// <p>The first eight "to" parameters are four X/Y coordinate pairs measured in the destination
+      /// {@link BitMatrix}, from the top left, where the known points in the image given by the "from"
+      /// parameters map to.</p>
+      /// 
+      /// <p>These 16 parameters define the transformation needed to sample the image.</p>
+      /// 
+      /// </summary>
+      /// <param name="image">image to sample
+      /// </param>
+      /// <param name="dimension">width/height of {@link BitMatrix} to sample from image
+      /// </param>
+      /// <returns> {@link BitMatrix} representing a grid of points sampled from the image within a region
+      /// defined by the "from" parameters
+      /// </returns>
+      /// <throws>  ReaderException if image can't be sampled, for example, if the transformation defined </throws>
+      /// <summary>   by the given points is invalid or results in sampling outside the image boundaries
+      /// </summary>
+      public abstract BitMatrix sampleGrid(BitMatrix image, int dimensionX, int dimensionY, float p1ToX, float p1ToY, float p2ToX, float p2ToY, float p3ToX, float p3ToY, float p4ToX, float p4ToY, float p1FromX, float p1FromY, float p2FromX, float p2FromY, float p3FromX, float p3FromY, float p4FromX, float p4FromY);
+
+      public virtual BitMatrix sampleGrid(BitMatrix image, int dimensionX, int dimensionY, PerspectiveTransform transform)
+      {
+         throw new System.NotSupportedException();
+      }
+
+
+      /// <summary> <p>Checks a set of points that have been transformed to sample points on an image against
+      /// the image's dimensions to see if the point are even within the image.</p>
+      /// 
+      /// <p>This method will actually "nudge" the endpoints back onto the image if they are found to be
+      /// barely (less than 1 pixel) off the image. This accounts for imperfect detection of finder
+      /// patterns in an image where the QR Code runs all the way to the image border.</p>
+      /// 
+      /// <p>For efficiency, the method will check points from either end of the line until one is found
+      /// to be within the image. Because the set of points are assumed to be linear, this is valid.</p>
+      /// 
+      /// </summary>
+      /// <param name="image">image into which the points should map
+      /// </param>
+      /// <param name="points">actual points in x1,y1,...,xn,yn form
+      /// </param>
+      protected internal static bool checkAndNudgePoints(BitMatrix image, float[] points)
+      {
+         int width = image.Width;
+         int height = image.Height;
+         // Check and nudge points from start until we see some that are OK:
+         bool nudged = true;
+         for (int offset = 0; offset < points.Length && nudged; offset += 2)
+         {
+            //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+            int x = (int)points[offset];
+            //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+            int y = (int)points[offset + 1];
+            if (x < -1 || x > width || y < -1 || y > height)
+            {
+               return false;
+            }
+            nudged = false;
+            if (x == -1)
+            {
+               points[offset] = 0.0f;
+               nudged = true;
+            }
+            else if (x == width)
+            {
+               points[offset] = width - 1;
+               nudged = true;
+            }
+            if (y == -1)
+            {
+               points[offset + 1] = 0.0f;
+               nudged = true;
+            }
+            else if (y == height)
+            {
+               points[offset + 1] = height - 1;
+               nudged = true;
+            }
+         }
+         // Check and nudge points from end:
+         nudged = true;
+         for (int offset = points.Length - 2; offset >= 0 && nudged; offset -= 2)
+         {
+            //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+            int x = (int)points[offset];
+            //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+            int y = (int)points[offset + 1];
+            if (x < -1 || x > width || y < -1 || y > height)
+            {
+               return false;
+            }
+            nudged = false;
+            if (x == -1)
+            {
+               points[offset] = 0.0f;
+               nudged = true;
+            }
+            else if (x == width)
+            {
+               points[offset] = width - 1;
+               nudged = true;
+            }
+            if (y == -1)
+            {
+               points[offset + 1] = 0.0f;
+               nudged = true;
+            }
+            else if (y == height)
+            {
+               points[offset + 1] = height - 1;
+               nudged = true;
+            }
+         }
+
+         return true;
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/common/HybridBinarizer.cs

@@ -0,0 +1,288 @@
+/*
+* Copyright 2009 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+namespace ZXing.Common
+{
+   /// <summary> This class implements a local thresholding algorithm, which while slower than the
+   /// GlobalHistogramBinarizer, is fairly efficient for what it does. It is designed for
+   /// high frequency images of barcodes with black data on white backgrounds. For this application,
+   /// it does a much better job than a global blackpoint with severe shadows and gradients.
+   /// However it tends to produce artifacts on lower frequency images and is therefore not
+   /// a good general purpose binarizer for uses outside ZXing.
+   /// 
+   /// This class extends GlobalHistogramBinarizer, using the older histogram approach for 1D readers,
+   /// and the newer local approach for 2D readers. 1D decoding using a per-row histogram is already
+   /// inherently local, and only fails for horizontal gradients. We can revisit that problem later,
+   /// but for now it was not a win to use local blocks for 1D.
+   /// 
+   /// This Binarizer is the default for the unit tests and the recommended class for library users.
+   /// 
+   /// </summary>
+   /// <author>  dswitkin@google.com (Daniel Switkin)
+   /// </author>
+   /// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source 
+   /// </author>
+   public sealed class HybridBinarizer : GlobalHistogramBinarizer
+   {
+      override public BitMatrix BlackMatrix
+      {
+         get
+         {
+            binarizeEntireImage();
+            return matrix;
+         }
+      }
+
+      // This class uses 5x5 blocks to compute local luminance, where each block is 8x8 pixels.
+      // So this is the smallest dimension in each axis we can accept.
+      private const int BLOCK_SIZE_POWER = 3;
+      private const int BLOCK_SIZE = 1 << BLOCK_SIZE_POWER; // ...0100...00
+      private const int BLOCK_SIZE_MASK = BLOCK_SIZE - 1;   // ...0011...11
+      private const int MINIMUM_DIMENSION = 40;
+      private const int MIN_DYNAMIC_RANGE = 24;
+
+      private BitMatrix matrix = null;
+
+      public HybridBinarizer(LuminanceSource source)
+         : base(source)
+      {
+      }
+
+      public override Binarizer createBinarizer(LuminanceSource source)
+      {
+         return new HybridBinarizer(source);
+      }
+
+      /// <summary>
+      /// Calculates the final BitMatrix once for all requests. This could be called once from the
+      /// constructor instead, but there are some advantages to doing it lazily, such as making
+      /// profiling easier, and not doing heavy lifting when callers don't expect it.
+      /// </summary>
+      private void binarizeEntireImage()
+      {
+         if (matrix == null)
+         {
+            LuminanceSource source = LuminanceSource;
+            int width = source.Width;
+            int height = source.Height;
+            if (width >= MINIMUM_DIMENSION && height >= MINIMUM_DIMENSION)
+            {
+               byte[] luminances = source.Matrix;
+
+               int subWidth = width >> BLOCK_SIZE_POWER;
+               if ((width & BLOCK_SIZE_MASK) != 0)
+               {
+                  subWidth++;
+               }
+               int subHeight = height >> BLOCK_SIZE_POWER;
+               if ((height & BLOCK_SIZE_MASK) != 0)
+               {
+                  subHeight++;
+               }
+               int[][] blackPoints = calculateBlackPoints(luminances, subWidth, subHeight, width, height);
+
+               var newMatrix = new BitMatrix(width, height);
+               calculateThresholdForBlock(luminances, subWidth, subHeight, width, height, blackPoints, newMatrix);
+               matrix = newMatrix;
+            }
+            else
+            {
+               // If the image is too small, fall back to the global histogram approach.
+               matrix = base.BlackMatrix;
+            }
+         }
+      }
+
+      /// <summary>
+      /// For each 8x8 block in the image, calculate the average black point using a 5x5 grid
+      /// of the blocks around it. Also handles the corner cases (fractional blocks are computed based
+      /// on the last 8 pixels in the row/column which are also used in the previous block).
+      /// </summary>
+      /// <param name="luminances">The luminances.</param>
+      /// <param name="subWidth">Width of the sub.</param>
+      /// <param name="subHeight">Height of the sub.</param>
+      /// <param name="width">The width.</param>
+      /// <param name="height">The height.</param>
+      /// <param name="blackPoints">The black points.</param>
+      /// <param name="matrix">The matrix.</param>
+      private static void calculateThresholdForBlock(byte[] luminances, int subWidth, int subHeight, int width, int height, int[][] blackPoints, BitMatrix matrix)
+      {
+         for (int y = 0; y < subHeight; y++)
+         {
+            int yoffset = y << BLOCK_SIZE_POWER;
+            int maxYOffset = height - BLOCK_SIZE;
+            if (yoffset > maxYOffset)
+            {
+               yoffset = maxYOffset;
+            }
+            for (int x = 0; x < subWidth; x++)
+            {
+               int xoffset = x << BLOCK_SIZE_POWER;
+               int maxXOffset = width - BLOCK_SIZE;
+               if (xoffset > maxXOffset)
+               {
+                  xoffset = maxXOffset;
+               }
+               int left = cap(x, 2, subWidth - 3);
+               int top = cap(y, 2, subHeight - 3);
+               int sum = 0;
+               for (int z = -2; z <= 2; z++)
+               {
+                  int[] blackRow = blackPoints[top + z];
+                  sum += blackRow[left - 2];
+                  sum += blackRow[left - 1];
+                  sum += blackRow[left];
+                  sum += blackRow[left + 1];
+                  sum += blackRow[left + 2];
+               }
+               int average = sum / 25;
+               thresholdBlock(luminances, xoffset, yoffset, average, width, matrix);
+            }
+         }
+      }
+
+      private static int cap(int value, int min, int max)
+      {
+         return value < min ? min : value > max ? max : value;
+      }
+
+      /// <summary>
+      /// Applies a single threshold to an 8x8 block of pixels.
+      /// </summary>
+      /// <param name="luminances">The luminances.</param>
+      /// <param name="xoffset">The xoffset.</param>
+      /// <param name="yoffset">The yoffset.</param>
+      /// <param name="threshold">The threshold.</param>
+      /// <param name="stride">The stride.</param>
+      /// <param name="matrix">The matrix.</param>
+      private static void thresholdBlock(byte[] luminances, int xoffset, int yoffset, int threshold, int stride, BitMatrix matrix)
+      {
+         int offset = (yoffset * stride) + xoffset;
+         for (int y = 0; y < BLOCK_SIZE; y++, offset += stride)
+         {
+            for (int x = 0; x < BLOCK_SIZE; x++)
+            {
+               int pixel = luminances[offset + x] & 0xff;
+               // Comparison needs to be <= so that black == 0 pixels are black even if the threshold is 0.
+               matrix[xoffset + x, yoffset + y] = (pixel <= threshold);
+            }
+         }
+      }
+
+      /// <summary>
+      /// Calculates a single black point for each 8x8 block of pixels and saves it away.
+      /// See the following thread for a discussion of this algorithm:
+      /// http://groups.google.com/group/zxing/browse_thread/thread/d06efa2c35a7ddc0
+      /// </summary>
+      /// <param name="luminances">The luminances.</param>
+      /// <param name="subWidth">Width of the sub.</param>
+      /// <param name="subHeight">Height of the sub.</param>
+      /// <param name="width">The width.</param>
+      /// <param name="height">The height.</param>
+      /// <returns></returns>
+      private static int[][] calculateBlackPoints(byte[] luminances, int subWidth, int subHeight, int width, int height)
+      {
+         int[][] blackPoints = new int[subHeight][];
+         for (int i = 0; i < subHeight; i++)
+         {
+            blackPoints[i] = new int[subWidth];
+         }
+
+         for (int y = 0; y < subHeight; y++)
+         {
+            int yoffset = y << BLOCK_SIZE_POWER;
+            int maxYOffset = height - BLOCK_SIZE;
+            if (yoffset > maxYOffset)
+            {
+               yoffset = maxYOffset;
+            }
+            for (int x = 0; x < subWidth; x++)
+            {
+               int xoffset = x << BLOCK_SIZE_POWER;
+               int maxXOffset = width - BLOCK_SIZE;
+               if (xoffset > maxXOffset)
+               {
+                  xoffset = maxXOffset;
+               }
+               int sum = 0;
+               int min = 0xFF;
+               int max = 0;
+               for (int yy = 0, offset = yoffset * width + xoffset; yy < BLOCK_SIZE; yy++, offset += width)
+               {
+                  for (int xx = 0; xx < BLOCK_SIZE; xx++)
+                  {
+                     int pixel = luminances[offset + xx] & 0xFF;
+                     // still looking for good contrast
+                     sum += pixel;
+                     if (pixel < min)
+                     {
+                        min = pixel;
+                     }
+                     if (pixel > max)
+                     {
+                        max = pixel;
+                     }
+                  }
+                  // short-circuit min/max tests once dynamic range is met
+                  if (max - min > MIN_DYNAMIC_RANGE)
+                  {
+                     // finish the rest of the rows quickly
+                     for (yy++, offset += width; yy < BLOCK_SIZE; yy++, offset += width)
+                     {
+                        for (int xx = 0; xx < BLOCK_SIZE; xx++)
+                        {
+                           sum += luminances[offset + xx] & 0xFF;
+                        }
+                     }
+                  }
+               }
+
+               // The default estimate is the average of the values in the block.
+               int average = sum >> (BLOCK_SIZE_POWER * 2);
+               if (max - min <= MIN_DYNAMIC_RANGE)
+               {
+                  // If variation within the block is low, assume this is a block with only light or only
+                  // dark pixels. In that case we do not want to use the average, as it would divide this
+                  // low contrast area into black and white pixels, essentially creating data out of noise.
+                  //
+                  // The default assumption is that the block is light/background. Since no estimate for
+                  // the level of dark pixels exists locally, use half the min for the block.
+                  average = min >> 1;
+
+                  if (y > 0 && x > 0)
+                  {
+                     // Correct the "white background" assumption for blocks that have neighbors by comparing
+                     // the pixels in this block to the previously calculated black points. This is based on
+                     // the fact that dark barcode symbology is always surrounded by some amount of light
+                     // background for which reasonable black point estimates were made. The bp estimated at
+                     // the boundaries is used for the interior.
+
+                     // The (min < bp) is arbitrary but works better than other heuristics that were tried.
+                     int averageNeighborBlackPoint = (blackPoints[y - 1][x] + (2 * blackPoints[y][x - 1]) +
+                         blackPoints[y - 1][x - 1]) >> 2;
+                     if (min < averageNeighborBlackPoint)
+                     {
+                        average = averageNeighborBlackPoint;
+                     }
+                  }
+               }
+               blackPoints[y][x] = average;
+            }
+         }
+         return blackPoints;
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/common/PerspectiveTransform.cs

@@ -0,0 +1,159 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+namespace ZXing.Common
+{
+   /// <summary> <p>This class implements a perspective transform in two dimensions. Given four source and four
+   /// destination points, it will compute the transformation implied between them. The code is based
+   /// directly upon section 3.4.2 of George Wolberg's "Digital Image Warping"; see pages 54-56.</p>
+   /// 
+   /// </summary>
+   /// <author>  Sean Owen
+   /// </author>
+   /// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source 
+   /// </author>
+   public sealed class PerspectiveTransform
+   {
+      private float a11;
+      private float a12;
+      private float a13;
+      private float a21;
+      private float a22;
+      private float a23;
+      private float a31;
+      private float a32;
+      private float a33;
+
+      private PerspectiveTransform(float a11, float a21, float a31, float a12, float a22, float a32, float a13, float a23, float a33)
+      {
+         this.a11 = a11;
+         this.a12 = a12;
+         this.a13 = a13;
+         this.a21 = a21;
+         this.a22 = a22;
+         this.a23 = a23;
+         this.a31 = a31;
+         this.a32 = a32;
+         this.a33 = a33;
+      }
+
+      public static PerspectiveTransform quadrilateralToQuadrilateral(float x0, float y0, float x1, float y1, float x2, float y2, float x3, float y3, float x0p, float y0p, float x1p, float y1p, float x2p, float y2p, float x3p, float y3p)
+      {
+
+         PerspectiveTransform qToS = quadrilateralToSquare(x0, y0, x1, y1, x2, y2, x3, y3);
+         PerspectiveTransform sToQ = squareToQuadrilateral(x0p, y0p, x1p, y1p, x2p, y2p, x3p, y3p);
+         return sToQ.times(qToS);
+      }
+
+      public void transformPoints(float[] points)
+      {
+         int max = points.Length;
+         float a11 = this.a11;
+         float a12 = this.a12;
+         float a13 = this.a13;
+         float a21 = this.a21;
+         float a22 = this.a22;
+         float a23 = this.a23;
+         float a31 = this.a31;
+         float a32 = this.a32;
+         float a33 = this.a33;
+         for (int i = 0; i < max; i += 2)
+         {
+            float x = points[i];
+            float y = points[i + 1];
+            float denominator = a13 * x + a23 * y + a33;
+            points[i] = (a11 * x + a21 * y + a31) / denominator;
+            points[i + 1] = (a12 * x + a22 * y + a32) / denominator;
+         }
+      }
+
+      /// <summary>Convenience method, not optimized for performance. </summary>
+      public void transformPoints(float[] xValues, float[] yValues)
+      {
+         int n = xValues.Length;
+         for (int i = 0; i < n; i++)
+         {
+            float x = xValues[i];
+            float y = yValues[i];
+            float denominator = a13 * x + a23 * y + a33;
+            xValues[i] = (a11 * x + a21 * y + a31) / denominator;
+            yValues[i] = (a12 * x + a22 * y + a32) / denominator;
+         }
+      }
+
+      public static PerspectiveTransform squareToQuadrilateral(float x0, float y0,
+                                                               float x1, float y1,
+                                                               float x2, float y2,
+                                                               float x3, float y3)
+      {
+         float dx3 = x0 - x1 + x2 - x3;
+         float dy3 = y0 - y1 + y2 - y3;
+         if (dx3 == 0.0f && dy3 == 0.0f)
+         {
+            // Affine
+            return new PerspectiveTransform(x1 - x0, x2 - x1, x0,
+                                            y1 - y0, y2 - y1, y0,
+                                            0.0f, 0.0f, 1.0f);
+         }
+         else
+         {
+            float dx1 = x1 - x2;
+            float dx2 = x3 - x2;
+            float dy1 = y1 - y2;
+            float dy2 = y3 - y2;
+            float denominator = dx1*dy2 - dx2*dy1;
+            float a13 = (dx3*dy2 - dx2*dy3)/denominator;
+            float a23 = (dx1*dy3 - dx3*dy1)/denominator;
+            return new PerspectiveTransform(x1 - x0 + a13*x1, x3 - x0 + a23*x3, x0,
+                                            y1 - y0 + a13*y1, y3 - y0 + a23*y3, y0,
+                                            a13, a23, 1.0f);
+         }
+      }
+
+      public static PerspectiveTransform quadrilateralToSquare(float x0, float y0, float x1, float y1, float x2, float y2, float x3, float y3)
+      {
+         // Here, the adjoint serves as the inverse:
+         return squareToQuadrilateral(x0, y0, x1, y1, x2, y2, x3, y3).buildAdjoint();
+      }
+
+      internal PerspectiveTransform buildAdjoint()
+      {
+         // Adjoint is the transpose of the cofactor matrix:
+         return new PerspectiveTransform(a22 * a33 - a23 * a32, 
+            a23 * a31 - a21 * a33, 
+            a21 * a32 - a22 * a31, 
+            a13 * a32 - a12 * a33, 
+            a11 * a33 - a13 * a31, 
+            a12 * a31 - a11 * a32, 
+            a12 * a23 - a13 * a22, 
+            a13 * a21 - a11 * a23, 
+            a11 * a22 - a12 * a21);
+      }
+
+      internal PerspectiveTransform times(PerspectiveTransform other)
+      {
+         return new PerspectiveTransform(a11 * other.a11 + a21 * other.a12 + a31 * other.a13, 
+            a11 * other.a21 + a21 * other.a22 + a31 * other.a23, 
+            a11 * other.a31 + a21 * other.a32 + a31 * other.a33, 
+            a12 * other.a11 + a22 * other.a12 + a32 * other.a13, 
+            a12 * other.a21 + a22 * other.a22 + a32 * other.a23, 
+            a12 * other.a31 + a22 * other.a32 + a32 * other.a33, 
+            a13 * other.a11 + a23 * other.a12 + a33 * other.a13, 
+            a13 * other.a21 + a23 * other.a22 + a33 * other.a23, 
+            a13 * other.a31 + a23 * other.a32 + a33 * other.a33);
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/common/StringUtils.cs

@@ -0,0 +1,266 @@
+/*
+ * Copyright (C) 2010 ZXing authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace ZXing.Common
+{
+   /// <summary>
+   /// Common string-related functions.
+   /// </summary>
+   /// <author>Sean Owen</author>
+   /// <author>Alex Dupre</author>
+   public static class StringUtils
+   {
+#if (WINDOWS_PHONE70 || WINDOWS_PHONE71 || WINDOWS_PHONE80 || SILVERLIGHT4 || SILVERLIGHT5 || NETFX_CORE || PORTABLE)
+      private const String PLATFORM_DEFAULT_ENCODING = "UTF-8";
+#else
+      private static String PLATFORM_DEFAULT_ENCODING = Encoding.Default.WebName;
+#endif
+      public static String SHIFT_JIS = "SJIS";
+      public static String GB2312 = "GB2312";
+      private const String EUC_JP = "EUC-JP";
+      private const String UTF8 = "UTF-8";
+      private const String ISO88591 = "ISO-8859-1";
+      private static readonly bool ASSUME_SHIFT_JIS =
+         String.Compare(SHIFT_JIS, PLATFORM_DEFAULT_ENCODING, StringComparison.OrdinalIgnoreCase) == 0 ||
+         String.Compare(EUC_JP, PLATFORM_DEFAULT_ENCODING, StringComparison.OrdinalIgnoreCase) == 0;
+
+      /// <summary>
+      /// Guesses the encoding.
+      /// </summary>
+      /// <param name="bytes">bytes encoding a string, whose encoding should be guessed</param>
+      /// <param name="hints">decode hints if applicable</param>
+      /// <returns>name of guessed encoding; at the moment will only guess one of:
+      /// {@link #SHIFT_JIS}, {@link #UTF8}, {@link #ISO88591}, or the platform
+      /// default encoding if none of these can possibly be correct</returns>
+      public static String guessEncoding(byte[] bytes, IDictionary<DecodeHintType, object> hints)
+      {
+         if (hints != null && hints.ContainsKey(DecodeHintType.CHARACTER_SET))
+         {
+            String characterSet = (String)hints[DecodeHintType.CHARACTER_SET];
+            if (characterSet != null)
+            {
+               return characterSet;
+            }
+         }
+
+         // For now, merely tries to distinguish ISO-8859-1, UTF-8 and Shift_JIS,
+         // which should be by far the most common encodings.
+         int length = bytes.Length;
+         bool canBeISO88591 = true;
+         bool canBeShiftJIS = true;
+         bool canBeUTF8 = true;
+         int utf8BytesLeft = 0;
+         //int utf8LowChars = 0;
+         int utf2BytesChars = 0;
+         int utf3BytesChars = 0;
+         int utf4BytesChars = 0;
+         int sjisBytesLeft = 0;
+         //int sjisLowChars = 0;
+         int sjisKatakanaChars = 0;
+         //int sjisDoubleBytesChars = 0;
+         int sjisCurKatakanaWordLength = 0;
+         int sjisCurDoubleBytesWordLength = 0;
+         int sjisMaxKatakanaWordLength = 0;
+         int sjisMaxDoubleBytesWordLength = 0;
+         //int isoLowChars = 0;
+         //int isoHighChars = 0;
+         int isoHighOther = 0;
+
+         bool utf8bom = bytes.Length > 3 &&
+             bytes[0] == 0xEF &&
+             bytes[1] == 0xBB &&
+             bytes[2] == 0xBF;
+
+         for (int i = 0;
+              i < length && (canBeISO88591 || canBeShiftJIS || canBeUTF8);
+              i++)
+         {
+
+            int value = bytes[i] & 0xFF;
+
+            // UTF-8 stuff
+            if (canBeUTF8)
+            {
+               if (utf8BytesLeft > 0)
+               {
+                  if ((value & 0x80) == 0)
+                  {
+                     canBeUTF8 = false;
+                  }
+                  else
+                  {
+                     utf8BytesLeft--;
+                  }
+               }
+               else if ((value & 0x80) != 0)
+               {
+                  if ((value & 0x40) == 0)
+                  {
+                     canBeUTF8 = false;
+                  }
+                  else
+                  {
+                     utf8BytesLeft++;
+                     if ((value & 0x20) == 0)
+                     {
+                        utf2BytesChars++;
+                     }
+                     else
+                     {
+                        utf8BytesLeft++;
+                        if ((value & 0x10) == 0)
+                        {
+                           utf3BytesChars++;
+                        }
+                        else
+                        {
+                           utf8BytesLeft++;
+                           if ((value & 0x08) == 0)
+                           {
+                              utf4BytesChars++;
+                           }
+                           else
+                           {
+                              canBeUTF8 = false;
+                           }
+                        }
+                     }
+                  }
+               } //else {
+               //utf8LowChars++;
+               //}
+            }
+
+            // ISO-8859-1 stuff
+            if (canBeISO88591)
+            {
+               if (value > 0x7F && value < 0xA0)
+               {
+                  canBeISO88591 = false;
+               }
+               else if (value > 0x9F)
+               {
+                  if (value < 0xC0 || value == 0xD7 || value == 0xF7)
+                  {
+                     isoHighOther++;
+                  } //else {
+                  //isoHighChars++;
+                  //}
+               } //else {
+               //isoLowChars++;
+               //}
+            }
+
+            // Shift_JIS stuff
+            if (canBeShiftJIS)
+            {
+               if (sjisBytesLeft > 0)
+               {
+                  if (value < 0x40 || value == 0x7F || value > 0xFC)
+                  {
+                     canBeShiftJIS = false;
+                  }
+                  else
+                  {
+                     sjisBytesLeft--;
+                  }
+               }
+               else if (value == 0x80 || value == 0xA0 || value > 0xEF)
+               {
+                  canBeShiftJIS = false;
+               }
+               else if (value > 0xA0 && value < 0xE0)
+               {
+                  sjisKatakanaChars++;
+                  sjisCurDoubleBytesWordLength = 0;
+                  sjisCurKatakanaWordLength++;
+                  if (sjisCurKatakanaWordLength > sjisMaxKatakanaWordLength)
+                  {
+                     sjisMaxKatakanaWordLength = sjisCurKatakanaWordLength;
+                  }
+               }
+               else if (value > 0x7F)
+               {
+                  sjisBytesLeft++;
+                  //sjisDoubleBytesChars++;
+                  sjisCurKatakanaWordLength = 0;
+                  sjisCurDoubleBytesWordLength++;
+                  if (sjisCurDoubleBytesWordLength > sjisMaxDoubleBytesWordLength)
+                  {
+                     sjisMaxDoubleBytesWordLength = sjisCurDoubleBytesWordLength;
+                  }
+               }
+               else
+               {
+                  //sjisLowChars++;
+                  sjisCurKatakanaWordLength = 0;
+                  sjisCurDoubleBytesWordLength = 0;
+               }
+            }
+         }
+
+         if (canBeUTF8 && utf8BytesLeft > 0)
+         {
+            canBeUTF8 = false;
+         }
+         if (canBeShiftJIS && sjisBytesLeft > 0)
+         {
+            canBeShiftJIS = false;
+         }
+
+         // Easy -- if there is BOM or at least 1 valid not-single byte character (and no evidence it can't be UTF-8), done
+         if (canBeUTF8 && (utf8bom || utf2BytesChars + utf3BytesChars + utf4BytesChars > 0))
+         {
+            return UTF8;
+         }
+         // Easy -- if assuming Shift_JIS or at least 3 valid consecutive not-ascii characters (and no evidence it can't be), done
+         if (canBeShiftJIS && (ASSUME_SHIFT_JIS || sjisMaxKatakanaWordLength >= 3 || sjisMaxDoubleBytesWordLength >= 3))
+         {
+            return SHIFT_JIS;
+         }
+         // Distinguishing Shift_JIS and ISO-8859-1 can be a little tough for short words. The crude heuristic is:
+         // - If we saw
+         //   - only two consecutive katakana chars in the whole text, or
+         //   - at least 10% of bytes that could be "upper" not-alphanumeric Latin1,
+         // - then we conclude Shift_JIS, else ISO-8859-1
+         if (canBeISO88591 && canBeShiftJIS)
+         {
+            return (sjisMaxKatakanaWordLength == 2 && sjisKatakanaChars == 2) || isoHighOther * 10 >= length
+                ? SHIFT_JIS : ISO88591;
+         }
+
+         // Otherwise, try in order ISO-8859-1, Shift JIS, UTF-8 and fall back to default platform encoding
+         if (canBeISO88591)
+         {
+            return ISO88591;
+         }
+         if (canBeShiftJIS)
+         {
+            return SHIFT_JIS;
+         }
+         if (canBeUTF8)
+         {
+            return UTF8;
+         }
+         // Otherwise, we take a wild guess with platform encoding
+         return PLATFORM_DEFAULT_ENCODING;
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/common/detector/MathUtils.cs

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2012 ZXing authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+using System;
+
+namespace ZXing.Common.Detector
+{
+   public static class MathUtils
+   {
+      /// <summary>
+      /// Ends up being a bit faster than {@link Math#round(float)}. This merely rounds its
+      /// argument to the nearest int, where x.5 rounds up to x+1.
+      /// </summary>
+      /// <param name="d">The d.</param>
+      /// <returns></returns>
+      public static int round(float d)
+      {
+         return (int)(d + 0.5f);
+      }
+
+      public static float distance(float aX, float aY, float bX, float bY)
+      {
+         float xDiff = aX - bX;
+         float yDiff = aY - bY;
+         return (float)Math.Sqrt(xDiff * xDiff + yDiff * yDiff);
+      }
+
+      public static float distance(int aX, int aY, int bX, int bY)
+      {
+         int xDiff = aX - bX;
+         int yDiff = aY - bY;
+         return (float)Math.Sqrt(xDiff * xDiff + yDiff * yDiff);
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/GenericGF.cs → shadowsocks-csharp/3rd/zxing/common/reedsolomon/GenericGF.cs

@@ -28,7 +28,16 @@ namespace ZXing.Common.ReedSolomon
    /// <author>Sean Owen</author>
    public sealed class GenericGF
    {
+      public static GenericGF AZTEC_DATA_12 = new GenericGF(0x1069, 4096, 1); // x^12 + x^6 + x^5 + x^3 + 1
+      public static GenericGF AZTEC_DATA_10 = new GenericGF(0x409, 1024, 1); // x^10 + x^3 + 1
+      public static GenericGF AZTEC_DATA_6 = new GenericGF(0x43, 64, 1); // x^6 + x + 1
+      public static GenericGF AZTEC_PARAM = new GenericGF(0x13, 16, 1); // x^4 + x + 1
       public static GenericGF QR_CODE_FIELD_256 = new GenericGF(0x011D, 256, 0); // x^8 + x^4 + x^3 + x^2 + 1
+      public static GenericGF DATA_MATRIX_FIELD_256 = new GenericGF(0x012D, 256, 1); // x^8 + x^5 + x^3 + x^2 + 1
+      public static GenericGF AZTEC_DATA_8 = DATA_MATRIX_FIELD_256;
+      public static GenericGF MAXICODE_FIELD_64 = AZTEC_DATA_6;
+
+      private const int INITIALIZATION_THRESHOLD = 0;
 
       private int[] expTable;
       private int[] logTable;
@@ -37,6 +46,7 @@ namespace ZXing.Common.ReedSolomon
       private readonly int size;
       private readonly int primitive;
       private readonly int generatorBase;
+      private bool initialized = false;
 
       /// <summary>
       /// Create a representation of GF(size) using the given primitive polynomial.
@@ -54,6 +64,14 @@ namespace ZXing.Common.ReedSolomon
          this.size = size;
          this.generatorBase = genBase;
 
+         if (size <= INITIALIZATION_THRESHOLD)
+         {
+            initialize();
+         }
+      }
+
+      private void initialize()
+      {
          expTable = new int[size];
          logTable = new int[size];
          int x = 1;
@@ -74,16 +92,35 @@ namespace ZXing.Common.ReedSolomon
          // logTable[0] == 0 but this should never be used
          zero = new GenericGFPoly(this, new int[] { 0 });
          one = new GenericGFPoly(this, new int[] { 1 });
+         initialized = true;
+      }
+
+      private void checkInit()
+      {
+         if (!initialized)
+         {
+            initialize();
+         }
       }
 
       internal GenericGFPoly Zero
       {
          get
          {
+            checkInit();
             return zero;
          }
       }
 
+      internal GenericGFPoly One
+      {
+         get
+         {
+            checkInit();
+            return one;
+         }
+      }
+
       /// <summary>
       /// Builds the monomial.
       /// </summary>
@@ -92,6 +129,8 @@ namespace ZXing.Common.ReedSolomon
       /// <returns>the monomial representing coefficient * x^degree</returns>
       internal GenericGFPoly buildMonomial(int degree, int coefficient)
       {
+         checkInit();
+
          if (degree < 0)
          {
             throw new ArgumentException();
@@ -120,9 +159,26 @@ namespace ZXing.Common.ReedSolomon
       /// <returns>2 to the power of a in GF(size)</returns>
       internal int exp(int a)
       {
+         checkInit();
+
          return expTable[a];
       }
 
+      /// <summary>
+      /// Logs the specified a.
+      /// </summary>
+      /// <param name="a">A.</param>
+      /// <returns>base 2 log of a in GF(size)</returns>
+      internal int log(int a)
+      {
+         checkInit();
+
+         if (a == 0)
+         {
+            throw new ArgumentException();
+         }
+         return logTable[a];
+      }
 
       /// <summary>
       /// Inverses the specified a.
@@ -130,6 +186,8 @@ namespace ZXing.Common.ReedSolomon
       /// <returns>multiplicative inverse of a</returns>
       internal int inverse(int a)
       {
+         checkInit();
+
          if (a == 0)
          {
             throw new ArithmeticException();
@@ -145,6 +203,8 @@ namespace ZXing.Common.ReedSolomon
       /// <returns>product of a and b in GF(size)</returns>
       internal int multiply(int a, int b)
       {
+         checkInit();
+
          if (a == 0 || b == 0)
          {
             return 0;
@@ -153,11 +213,30 @@ namespace ZXing.Common.ReedSolomon
       }
 
       /// <summary>
+      /// Gets the size.
+      /// </summary>
+      public int Size
+      {
+         get { return size; }
+      }
+
+      /// <summary>
       /// Gets the generator base.
       /// </summary>
       public int GeneratorBase
       {
          get { return generatorBase; }
       }
+
+      /// <summary>
+      /// Returns a <see cref="System.String"/> that represents this instance.
+      /// </summary>
+      /// <returns>
+      /// A <see cref="System.String"/> that represents this instance.
+      /// </returns>
+      override public String ToString()
+      {
+         return "GF(0x" + primitive.ToString("X") + ',' + size + ')';
+      }
    }
 }

shadowsocks-csharp/3rd/zxing/GenericGFPoly.cs → shadowsocks-csharp/3rd/zxing/common/reedsolomon/GenericGFPoly.cs

@@ -59,7 +59,7 @@ namespace ZXing.Common.ReedSolomon
             }
             if (firstNonZero == coefficientsLength)
             {
-               this.coefficients = new int[]{0};
+               this.coefficients = field.Zero.coefficients;
             }
             else
             {
@@ -112,6 +112,36 @@ namespace ZXing.Common.ReedSolomon
          return coefficients[coefficients.Length - 1 - degree];
       }
 
+      /// <summary>
+      /// evaluation of this polynomial at a given point
+      /// </summary>
+      /// <param name="a">A.</param>
+      /// <returns>evaluation of this polynomial at a given point</returns>
+      internal int evaluateAt(int a)
+      {
+         int result = 0;
+         if (a == 0)
+         {
+            // Just return the x^0 coefficient
+            return getCoefficient(0);
+         }
+         int size = coefficients.Length;
+         if (a == 1)
+         {
+            // Just the sum of the coefficients
+            foreach (var coefficient in coefficients)
+            {
+               result = GenericGF.addOrSubtract(result, coefficient);
+            }
+            return result;
+         }
+         result = coefficients[0];
+         for (int i = 1; i < size; i++)
+         {
+            result = GenericGF.addOrSubtract(field.multiply(a, result), coefficients[i]);
+         }
+         return result;
+      }
 
       internal GenericGFPoly addOrSubtract(GenericGFPoly other)
       {
@@ -176,6 +206,24 @@ namespace ZXing.Common.ReedSolomon
          return new GenericGFPoly(field, product);
       }
 
+      internal GenericGFPoly multiply(int scalar)
+      {
+         if (scalar == 0)
+         {
+            return field.Zero;
+         }
+         if (scalar == 1)
+         {
+            return this;
+         }
+         int size = coefficients.Length;
+         int[] product = new int[size];
+         for (int i = 0; i < size; i++)
+         {
+            product[i] = field.multiply(coefficients[i], scalar);
+         }
+         return new GenericGFPoly(field, product);
+      }
 
       internal GenericGFPoly multiplyByMonomial(int degree, int coefficient)
       {
@@ -226,5 +274,58 @@ namespace ZXing.Common.ReedSolomon
          return new GenericGFPoly[] { quotient, remainder };
       }
 
+      public override String ToString()
+      {
+         StringBuilder result = new StringBuilder(8 * Degree);
+         for (int degree = Degree; degree >= 0; degree--)
+         {
+            int coefficient = getCoefficient(degree);
+            if (coefficient != 0)
+            {
+               if (coefficient < 0)
+               {
+                  result.Append(" - ");
+                  coefficient = -coefficient;
+               }
+               else
+               {
+                  if (result.Length > 0)
+                  {
+                     result.Append(" + ");
+                  }
+               }
+               if (degree == 0 || coefficient != 1)
+               {
+                  int alphaPower = field.log(coefficient);
+                  if (alphaPower == 0)
+                  {
+                     result.Append('1');
+                  }
+                  else if (alphaPower == 1)
+                  {
+                     result.Append('a');
+                  }
+                  else
+                  {
+                     result.Append("a^");
+                     result.Append(alphaPower);
+                  }
+               }
+               if (degree != 0)
+               {
+                  if (degree == 1)
+                  {
+                     result.Append('x');
+                  }
+                  else
+                  {
+                     result.Append("x^");
+                     result.Append(degree);
+                  }
+               }
+            }
+         }
+         return result.ToString();
+      }
    }
 }

shadowsocks-csharp/3rd/zxing/common/reedsolomon/ReedSolomonDecoder.cs

@@ -0,0 +1,227 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+namespace ZXing.Common.ReedSolomon
+{
+   /// <summary> <p>Implements Reed-Solomon decoding, as the name implies.</p>
+   /// 
+   /// <p>The algorithm will not be explained here, but the following references were helpful
+   /// in creating this implementation:</p>
+   /// 
+   /// <ul>
+   /// <li>Bruce Maggs.
+   /// <a href="http://www.cs.cmu.edu/afs/cs.cmu.edu/project/pscico-guyb/realworld/www/rs_decode.ps">
+   /// "Decoding Reed-Solomon Codes"</a> (see discussion of Forney's Formula)</li>
+   /// <li>J.I. Hall. <a href="www.mth.msu.edu/~jhall/classes/codenotes/GRS.pdf">
+   /// "Chapter 5. Generalized Reed-Solomon Codes"</a>
+   /// (see discussion of Euclidean algorithm)</li>
+   /// </ul>
+   /// 
+   /// <p>Much credit is due to William Rucklidge since portions of this code are an indirect
+   /// port of his C++ Reed-Solomon implementation.</p>
+   /// 
+   /// </summary>
+   /// <author>Sean Owen</author>
+   /// <author>William Rucklidge</author>
+   /// <author>sanfordsquires</author>
+   public sealed class ReedSolomonDecoder
+   {
+      private readonly GenericGF field;
+
+      public ReedSolomonDecoder(GenericGF field)
+      {
+         this.field = field;
+      }
+
+      /// <summary>
+      ///   <p>Decodes given set of received codewords, which include both data and error-correction
+      /// codewords. Really, this means it uses Reed-Solomon to detect and correct errors, in-place,
+      /// in the input.</p>
+      /// </summary>
+      /// <param name="received">data and error-correction codewords</param>
+      /// <param name="twoS">number of error-correction codewords available</param>
+      /// <returns>false: decoding fails</returns>
+      public bool decode(int[] received, int twoS)
+      {
+         var poly = new GenericGFPoly(field, received);
+         var syndromeCoefficients = new int[twoS];
+         var noError = true;
+         for (var i = 0; i < twoS; i++)
+         {
+            var eval = poly.evaluateAt(field.exp(i + field.GeneratorBase));
+            syndromeCoefficients[syndromeCoefficients.Length - 1 - i] = eval;
+            if (eval != 0)
+            {
+               noError = false;
+            }
+         }
+         if (noError)
+         {
+            return true;
+         }
+         var syndrome = new GenericGFPoly(field, syndromeCoefficients);
+
+         var sigmaOmega = runEuclideanAlgorithm(field.buildMonomial(twoS, 1), syndrome, twoS);
+         if (sigmaOmega == null)
+            return false;
+
+         var sigma = sigmaOmega[0];
+         var errorLocations = findErrorLocations(sigma);
+         if (errorLocations == null)
+            return false;
+
+         var omega = sigmaOmega[1];
+         var errorMagnitudes = findErrorMagnitudes(omega, errorLocations);
+         for (var i = 0; i < errorLocations.Length; i++)
+         {
+            var position = received.Length - 1 - field.log(errorLocations[i]);
+            if (position < 0)
+            {
+               // throw new ReedSolomonException("Bad error location");
+               return false;
+            }
+            received[position] = GenericGF.addOrSubtract(received[position], errorMagnitudes[i]);
+         }
+
+         return true;
+      }
+
+      internal GenericGFPoly[] runEuclideanAlgorithm(GenericGFPoly a, GenericGFPoly b, int R)
+      {
+         // Assume a's degree is >= b's
+         if (a.Degree < b.Degree)
+         {
+            GenericGFPoly temp = a;
+            a = b;
+            b = temp;
+         }
+
+         GenericGFPoly rLast = a;
+         GenericGFPoly r = b;
+         GenericGFPoly tLast = field.Zero;
+         GenericGFPoly t = field.One;
+
+         // Run Euclidean algorithm until r's degree is less than R/2
+         while (r.Degree >= R / 2)
+         {
+            GenericGFPoly rLastLast = rLast;
+            GenericGFPoly tLastLast = tLast;
+            rLast = r;
+            tLast = t;
+
+            // Divide rLastLast by rLast, with quotient in q and remainder in r
+            if (rLast.isZero)
+            {
+               // Oops, Euclidean algorithm already terminated?
+               // throw new ReedSolomonException("r_{i-1} was zero");
+               return null;
+            }
+            r = rLastLast;
+            GenericGFPoly q = field.Zero;
+            int denominatorLeadingTerm = rLast.getCoefficient(rLast.Degree);
+            int dltInverse = field.inverse(denominatorLeadingTerm);
+            while (r.Degree >= rLast.Degree && !r.isZero)
+            {
+               int degreeDiff = r.Degree - rLast.Degree;
+               int scale = field.multiply(r.getCoefficient(r.Degree), dltInverse);
+               q = q.addOrSubtract(field.buildMonomial(degreeDiff, scale));
+               r = r.addOrSubtract(rLast.multiplyByMonomial(degreeDiff, scale));
+            }
+
+            t = q.multiply(tLast).addOrSubtract(tLastLast);
+
+            if (r.Degree >= rLast.Degree)
+            {
+               // throw new IllegalStateException("Division algorithm failed to reduce polynomial?");
+               return null;
+            }
+         }
+
+         int sigmaTildeAtZero = t.getCoefficient(0);
+         if (sigmaTildeAtZero == 0)
+         {
+            // throw new ReedSolomonException("sigmaTilde(0) was zero");
+            return null;
+         }
+
+         int inverse = field.inverse(sigmaTildeAtZero);
+         GenericGFPoly sigma = t.multiply(inverse);
+         GenericGFPoly omega = r.multiply(inverse);
+         return new GenericGFPoly[] { sigma, omega };
+      }
+
+      private int[] findErrorLocations(GenericGFPoly errorLocator)
+      {
+         // This is a direct application of Chien's search
+         int numErrors = errorLocator.Degree;
+         if (numErrors == 1)
+         {
+            // shortcut
+            return new int[] { errorLocator.getCoefficient(1) };
+         }
+         int[] result = new int[numErrors];
+         int e = 0;
+         for (int i = 1; i < field.Size && e < numErrors; i++)
+         {
+            if (errorLocator.evaluateAt(i) == 0)
+            {
+               result[e] = field.inverse(i);
+               e++;
+            }
+         }
+         if (e != numErrors)
+         {
+            // throw new ReedSolomonException("Error locator degree does not match number of roots");
+            return null;
+         }
+         return result;
+      }
+
+      private int[] findErrorMagnitudes(GenericGFPoly errorEvaluator, int[] errorLocations)
+      {
+         // This is directly applying Forney's Formula
+         int s = errorLocations.Length;
+         int[] result = new int[s];
+         for (int i = 0; i < s; i++)
+         {
+            int xiInverse = field.inverse(errorLocations[i]);
+            int denominator = 1;
+            for (int j = 0; j < s; j++)
+            {
+               if (i != j)
+               {
+                  //denominator = field.multiply(denominator,
+                  //    GenericGF.addOrSubtract(1, field.multiply(errorLocations[j], xiInverse)));
+                  // Above should work but fails on some Apple and Linux JDKs due to a Hotspot bug.
+                  // Below is a funny-looking workaround from Steven Parkes
+                  int term = field.multiply(errorLocations[j], xiInverse);
+                  int termPlus1 = (term & 0x1) == 0 ? term | 1 : term & ~1;
+                  denominator = field.multiply(denominator, termPlus1);
+
+                  // removed in java version, not sure if this is right
+                  // denominator = field.multiply(denominator, GenericGF.addOrSubtract(1, field.multiply(errorLocations[j], xiInverse)));
+               }
+            }
+            result[i] = field.multiply(errorEvaluator.evaluateAt(xiInverse), field.inverse(denominator));
+            if (field.GeneratorBase != 0)
+            {
+               result[i] = field.multiply(result[i], xiInverse);
+            }
+         }
+         return result;
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/qrcode/QRCodeReader.cs

@@ -0,0 +1,255 @@
+/*
+ * Copyright 2007 ZXing authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+using System;
+using System.Collections.Generic;
+
+using ZXing.Common;
+using ZXing.QrCode.Internal;
+
+namespace ZXing.QrCode
+{
+   /// <summary>
+   /// This implementation can detect and decode QR Codes in an image.
+   /// <author>Sean Owen</author>
+   /// </summary>
+   public class QRCodeReader
+   {
+      private static readonly ResultPoint[] NO_POINTS = new ResultPoint[0];
+
+      private readonly Decoder decoder = new Decoder();
+
+      /// <summary>
+      /// Gets the decoder.
+      /// </summary>
+      /// <returns></returns>
+      protected Decoder getDecoder()
+      {
+         return decoder;
+      }
+
+      /// <summary>
+      /// Locates and decodes a QR code in an image.
+      ///
+      /// <returns>a String representing the content encoded by the QR code</returns>
+      /// </summary>
+      public Result decode(BinaryBitmap image)
+      {
+         return decode(image, null);
+      }
+
+      /// <summary>
+      /// Locates and decodes a barcode in some format within an image. This method also accepts
+      /// hints, each possibly associated to some data, which may help the implementation decode.
+      /// </summary>
+      /// <param name="image">image of barcode to decode</param>
+      /// <param name="hints">passed as a <see cref="IDictionary{TKey, TValue}"/> from <see cref="DecodeHintType"/>
+      /// to arbitrary data. The
+      /// meaning of the data depends upon the hint type. The implementation may or may not do
+      /// anything with these hints.</param>
+      /// <returns>
+      /// String which the barcode encodes
+      /// </returns>
+      public Result decode(BinaryBitmap image, IDictionary<DecodeHintType, object> hints)
+      {
+         DecoderResult decoderResult;
+         ResultPoint[] points;
+         if (image == null || image.BlackMatrix == null)
+         {
+            // something is wrong with the image
+            return null;
+         }
+         if (hints != null && hints.ContainsKey(DecodeHintType.PURE_BARCODE))
+         {
+            var bits = extractPureBits(image.BlackMatrix);
+            if (bits == null)
+               return null;
+            decoderResult = decoder.decode(bits, hints);
+            points = NO_POINTS;
+         }
+         else
+         {
+            var detectorResult = new Detector(image.BlackMatrix).detect(hints);
+            if (detectorResult == null)
+               return null;
+            decoderResult = decoder.decode(detectorResult.Bits, hints);
+            points = detectorResult.Points;
+         }
+         if (decoderResult == null)
+            return null;
+
+         // If the code was mirrored: swap the bottom-left and the top-right points.
+         var data = decoderResult.Other as QRCodeDecoderMetaData;
+         if (data != null)
+         {
+            data.applyMirroredCorrection(points);
+         }
+
+         var result = new Result(decoderResult.Text, decoderResult.RawBytes, points, BarcodeFormat.QR_CODE);
+         var byteSegments = decoderResult.ByteSegments;
+         if (byteSegments != null)
+         {
+            result.putMetadata(ResultMetadataType.BYTE_SEGMENTS, byteSegments);
+         }
+         var ecLevel = decoderResult.ECLevel;
+         if (ecLevel != null)
+         {
+            result.putMetadata(ResultMetadataType.ERROR_CORRECTION_LEVEL, ecLevel);
+         }
+         if (decoderResult.StructuredAppend)
+         {
+            result.putMetadata(ResultMetadataType.STRUCTURED_APPEND_SEQUENCE, decoderResult.StructuredAppendSequenceNumber);
+            result.putMetadata(ResultMetadataType.STRUCTURED_APPEND_PARITY, decoderResult.StructuredAppendParity);
+         }
+         return result;
+      }
+
+      /// <summary>
+      /// Resets any internal state the implementation has after a decode, to prepare it
+      /// for reuse.
+      /// </summary>
+      public void reset()
+      {
+         // do nothing
+      }
+
+      /// <summary>
+      /// This method detects a code in a "pure" image -- that is, pure monochrome image
+      /// which contains only an unrotated, unskewed, image of a code, with some white border
+      /// around it. This is a specialized method that works exceptionally fast in this special
+      /// case.
+      /// 
+      /// <seealso cref="ZXing.Datamatrix.DataMatrixReader.extractPureBits(BitMatrix)" />
+      /// </summary>
+      private static BitMatrix extractPureBits(BitMatrix image)
+      {
+         int[] leftTopBlack = image.getTopLeftOnBit();
+         int[] rightBottomBlack = image.getBottomRightOnBit();
+         if (leftTopBlack == null || rightBottomBlack == null)
+         {
+            return null;
+         }
+
+         float moduleSize;
+         if (!QRCodeReader.moduleSize(leftTopBlack, image, out moduleSize))
+            return null;
+
+         int top = leftTopBlack[1];
+         int bottom = rightBottomBlack[1];
+         int left = leftTopBlack[0];
+         int right = rightBottomBlack[0];
+
+         // Sanity check!
+         if (left >= right || top >= bottom)
+         {
+            return null;
+         }
+
+         if (bottom - top != right - left)
+         {
+            // Special case, where bottom-right module wasn't black so we found something else in the last row
+            // Assume it's a square, so use height as the width
+            right = left + (bottom - top);
+         }
+
+         int matrixWidth = (int)Math.Round((right - left + 1) / moduleSize);
+         int matrixHeight = (int)Math.Round((bottom - top + 1) / moduleSize);
+         if (matrixWidth <= 0 || matrixHeight <= 0)
+         {
+            return null;
+         }
+         if (matrixHeight != matrixWidth)
+         {
+            // Only possibly decode square regions
+            return null;
+         }
+
+         // Push in the "border" by half the module width so that we start
+         // sampling in the middle of the module. Just in case the image is a
+         // little off, this will help recover.
+         int nudge = (int)(moduleSize / 2.0f);
+         top += nudge;
+         left += nudge;
+
+         // But careful that this does not sample off the edge
+         int nudgedTooFarRight = left + (int)((matrixWidth - 1) * moduleSize) - (right - 1);
+         if (nudgedTooFarRight > 0)
+         {
+            if (nudgedTooFarRight > nudge)
+            {
+               // Neither way fits; abort
+               return null;
+            }
+            left -= nudgedTooFarRight;
+         }
+         int nudgedTooFarDown = top + (int)((matrixHeight - 1) * moduleSize) - (bottom - 1);
+         if (nudgedTooFarDown > 0)
+         {
+            if (nudgedTooFarDown > nudge)
+            {
+               // Neither way fits; abort
+               return null;
+            }
+            top -= nudgedTooFarDown;
+         }
+
+         // Now just read off the bits
+         BitMatrix bits = new BitMatrix(matrixWidth, matrixHeight);
+         for (int y = 0; y < matrixHeight; y++)
+         {
+            int iOffset = top + (int)(y * moduleSize);
+            for (int x = 0; x < matrixWidth; x++)
+            {
+               if (image[left + (int)(x * moduleSize), iOffset])
+               {
+                  bits[x, y] = true;
+               }
+            }
+         }
+         return bits;
+      }
+
+      private static bool moduleSize(int[] leftTopBlack, BitMatrix image, out float msize)
+      {
+         int height = image.Height;
+         int width = image.Width;
+         int x = leftTopBlack[0];
+         int y = leftTopBlack[1];
+         bool inBlack = true;
+         int transitions = 0;
+         while (x < width && y < height)
+         {
+            if (inBlack != image[x, y])
+            {
+               if (++transitions == 5)
+               {
+                  break;
+               }
+               inBlack = !inBlack;
+            }
+            x++;
+            y++;
+         }
+         if (x == width || y == height)
+         {
+            msize = 0.0f;
+            return false;
+         }
+         msize = (x - leftTopBlack[0]) / 7.0f;
+         return true;
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/qrcode/decoder/BitMatrixParser.cs

@@ -0,0 +1,281 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using ZXing.Common;
+
+namespace ZXing.QrCode.Internal
+{
+   /// <author>Sean Owen</author>
+   sealed class BitMatrixParser
+   {
+      private readonly BitMatrix bitMatrix;
+      private Version parsedVersion;
+      private FormatInformation parsedFormatInfo;
+      private bool mirrored;
+
+      /// <param name="bitMatrix">{@link BitMatrix} to parse</param>
+      /// <throws>ReaderException if dimension is not >= 21 and 1 mod 4</throws>
+      internal static BitMatrixParser createBitMatrixParser(BitMatrix bitMatrix)
+      {
+         int dimension = bitMatrix.Height;
+         if (dimension < 21 || (dimension & 0x03) != 1)
+         {
+            return null;
+         }
+         return new BitMatrixParser(bitMatrix);
+      }
+
+      private BitMatrixParser(BitMatrix bitMatrix)
+      {
+         // Should only be called from createBitMatrixParser with the important checks before
+         this.bitMatrix = bitMatrix;
+      }
+
+      /// <summary> <p>Reads format information from one of its two locations within the QR Code.</p>
+      /// 
+      /// </summary>
+      /// <returns> {@link FormatInformation} encapsulating the QR Code's format info
+      /// </returns>
+      /// <throws>  ReaderException if both format information locations cannot be parsed as </throws>
+      /// <summary> the valid encoding of format information
+      /// </summary>
+      internal FormatInformation readFormatInformation()
+      {
+         if (parsedFormatInfo != null)
+         {
+            return parsedFormatInfo;
+         }
+
+         // Read top-left format info bits
+         int formatInfoBits1 = 0;
+         for (int i = 0; i < 6; i++)
+         {
+            formatInfoBits1 = copyBit(i, 8, formatInfoBits1);
+         }
+         // .. and skip a bit in the timing pattern ...
+         formatInfoBits1 = copyBit(7, 8, formatInfoBits1);
+         formatInfoBits1 = copyBit(8, 8, formatInfoBits1);
+         formatInfoBits1 = copyBit(8, 7, formatInfoBits1);
+         // .. and skip a bit in the timing pattern ...
+         for (int j = 5; j >= 0; j--)
+         {
+            formatInfoBits1 = copyBit(8, j, formatInfoBits1);
+         }
+         // Read the top-right/bottom-left pattern too
+         int dimension = bitMatrix.Height;
+         int formatInfoBits2 = 0;
+         int jMin = dimension - 7;
+         for (int j = dimension - 1; j >= jMin; j--)
+         {
+            formatInfoBits2 = copyBit(8, j, formatInfoBits2);
+         }
+         for (int i = dimension - 8; i < dimension; i++)
+         {
+            formatInfoBits2 = copyBit(i, 8, formatInfoBits2);
+         }
+
+         parsedFormatInfo = FormatInformation.decodeFormatInformation(formatInfoBits1, formatInfoBits2);
+         if (parsedFormatInfo != null)
+         {
+            return parsedFormatInfo;
+         }
+         return null;
+      }
+
+      /// <summary> <p>Reads version information from one of its two locations within the QR Code.</p>
+      /// 
+      /// </summary>
+      /// <returns> {@link Version} encapsulating the QR Code's version
+      /// </returns>
+      /// <throws>  ReaderException if both version information locations cannot be parsed as </throws>
+      /// <summary> the valid encoding of version information
+      /// </summary>
+      internal Version readVersion()
+      {
+         if (parsedVersion != null)
+         {
+            return parsedVersion;
+         }
+
+         int dimension = bitMatrix.Height;
+
+         int provisionalVersion = (dimension - 17) >> 2;
+         if (provisionalVersion <= 6)
+         {
+            return Version.getVersionForNumber(provisionalVersion);
+         }
+
+         // Read top-right version info: 3 wide by 6 tall
+         int versionBits = 0;
+         int ijMin = dimension - 11;
+         for (int j = 5; j >= 0; j--)
+         {
+            for (int i = dimension - 9; i >= ijMin; i--)
+            {
+               versionBits = copyBit(i, j, versionBits);
+            }
+         }
+
+         parsedVersion = Version.decodeVersionInformation(versionBits);
+         if (parsedVersion != null && parsedVersion.DimensionForVersion == dimension)
+         {
+            return parsedVersion;
+         }
+
+         // Hmm, failed. Try bottom left: 6 wide by 3 tall
+         versionBits = 0;
+         for (int i = 5; i >= 0; i--)
+         {
+            for (int j = dimension - 9; j >= ijMin; j--)
+            {
+               versionBits = copyBit(i, j, versionBits);
+            }
+         }
+
+         parsedVersion = Version.decodeVersionInformation(versionBits);
+         if (parsedVersion != null && parsedVersion.DimensionForVersion == dimension)
+         {
+            return parsedVersion;
+         }
+         return null;
+      }
+
+      private int copyBit(int i, int j, int versionBits)
+      {
+         bool bit = mirrored ? bitMatrix[j, i] : bitMatrix[i, j];
+         return bit ? (versionBits << 1) | 0x1 : versionBits << 1;
+      }
+
+      /// <summary> <p>Reads the bits in the {@link BitMatrix} representing the finder pattern in the
+      /// correct order in order to reconstruct the codewords bytes contained within the
+      /// QR Code.</p>
+      /// 
+      /// </summary>
+      /// <returns> bytes encoded within the QR Code
+      /// </returns>
+      /// <throws>  ReaderException if the exact number of bytes expected is not read </throws>
+      internal byte[] readCodewords()
+      {
+         FormatInformation formatInfo = readFormatInformation();
+         if (formatInfo == null)
+            return null;
+         Version version = readVersion();
+         if (version == null)
+            return null;
+
+         // Get the data mask for the format used in this QR Code. This will exclude
+         // some bits from reading as we wind through the bit matrix.
+         DataMask dataMask = DataMask.forReference(formatInfo.DataMask);
+         int dimension = bitMatrix.Height;
+         dataMask.unmaskBitMatrix(bitMatrix, dimension);
+
+         BitMatrix functionPattern = version.buildFunctionPattern();
+
+         bool readingUp = true;
+         byte[] result = new byte[version.TotalCodewords];
+         int resultOffset = 0;
+         int currentByte = 0;
+         int bitsRead = 0;
+         // Read columns in pairs, from right to left
+         for (int j = dimension - 1; j > 0; j -= 2)
+         {
+            if (j == 6)
+            {
+               // Skip whole column with vertical alignment pattern;
+               // saves time and makes the other code proceed more cleanly
+               j--;
+            }
+            // Read alternatingly from bottom to top then top to bottom
+            for (int count = 0; count < dimension; count++)
+            {
+               int i = readingUp ? dimension - 1 - count : count;
+               for (int col = 0; col < 2; col++)
+               {
+                  // Ignore bits covered by the function pattern
+                  if (!functionPattern[j - col, i])
+                  {
+                     // Read a bit
+                     bitsRead++;
+                     currentByte <<= 1;
+                     if (bitMatrix[j - col, i])
+                     {
+                        currentByte |= 1;
+                     }
+                     // If we've made a whole byte, save it off
+                     if (bitsRead == 8)
+                     {
+                        result[resultOffset++] = (byte)currentByte;
+                        bitsRead = 0;
+                        currentByte = 0;
+                     }
+                  }
+               }
+            }
+            readingUp ^= true; // readingUp = !readingUp; // switch directions
+         }
+         if (resultOffset != version.TotalCodewords)
+         {
+            return null;
+         }
+         return result;
+      }
+
+      /**
+       * Revert the mask removal done while reading the code words. The bit matrix should revert to its original state.
+       */
+      internal void remask()
+      {
+         if (parsedFormatInfo == null)
+         {
+            return; // We have no format information, and have no data mask
+         }
+         DataMask dataMask = DataMask.forReference(parsedFormatInfo.DataMask);
+         int dimension = bitMatrix.Height;
+         dataMask.unmaskBitMatrix(bitMatrix, dimension);
+      }
+
+      /**
+       * Prepare the parser for a mirrored operation.
+       * This flag has effect only on the {@link #readFormatInformation()} and the
+       * {@link #readVersion()}. Before proceeding with {@link #readCodewords()} the
+       * {@link #mirror()} method should be called.
+       * 
+       * @param mirror Whether to read version and format information mirrored.
+       */
+      internal void setMirror(bool mirror)
+      {
+         parsedVersion = null;
+         parsedFormatInfo = null;
+         mirrored = mirror;
+      }
+
+      /** Mirror the bit matrix in order to attempt a second reading. */
+      internal void mirror()
+      {
+         for (int x = 0; x < bitMatrix.Width; x++)
+         {
+            for (int y = x + 1; y < bitMatrix.Height; y++)
+            {
+               if (bitMatrix[x, y] != bitMatrix[y, x])
+               {
+                  bitMatrix.flip(y, x);
+                  bitMatrix.flip(x, y);
+               }
+            }
+         }
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/qrcode/decoder/DataBlock.cs

@@ -0,0 +1,146 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+namespace ZXing.QrCode.Internal
+{
+   /// <summary> <p>Encapsulates a block of data within a QR Code. QR Codes may split their data into
+   /// multiple blocks, each of which is a unit of data and error-correction codewords. Each
+   /// is represented by an instance of this class.</p>
+   /// 
+   /// </summary>
+   /// <author>  Sean Owen
+   /// </author>
+   /// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source 
+   /// </author>
+   internal sealed class DataBlock
+   {
+      private readonly int numDataCodewords;
+      private readonly byte[] codewords;
+
+      private DataBlock(int numDataCodewords, byte[] codewords)
+      {
+         this.numDataCodewords = numDataCodewords;
+         this.codewords = codewords;
+      }
+
+      /// <summary> <p>When QR Codes use multiple data blocks, they are actually interleaved.
+      /// That is, the first byte of data block 1 to n is written, then the second bytes, and so on. This
+      /// method will separate the data into original blocks.</p>
+      /// 
+      /// </summary>
+      /// <param name="rawCodewords">bytes as read directly from the QR Code
+      /// </param>
+      /// <param name="version">version of the QR Code
+      /// </param>
+      /// <param name="ecLevel">error-correction level of the QR Code
+      /// </param>
+      /// <returns> {@link DataBlock}s containing original bytes, "de-interleaved" from representation in the
+      /// QR Code
+      /// </returns>
+      internal static DataBlock[] getDataBlocks(byte[] rawCodewords, Version version, ErrorCorrectionLevel ecLevel)
+      {
+
+         if (rawCodewords.Length != version.TotalCodewords)
+         {
+            throw new System.ArgumentException();
+         }
+
+         // Figure out the number and size of data blocks used by this version and
+         // error correction level
+         Version.ECBlocks ecBlocks = version.getECBlocksForLevel(ecLevel);
+
+         // First count the total number of data blocks
+         int totalBlocks = 0;
+         Version.ECB[] ecBlockArray = ecBlocks.getECBlocks();
+         foreach (var ecBlock in ecBlockArray)
+         {
+            totalBlocks += ecBlock.Count;
+         }
+
+         // Now establish DataBlocks of the appropriate size and number of data codewords
+         DataBlock[] result = new DataBlock[totalBlocks];
+         int numResultBlocks = 0;
+         foreach (var ecBlock in ecBlockArray)
+         {
+            for (int i = 0; i < ecBlock.Count; i++)
+            {
+               int numDataCodewords = ecBlock.DataCodewords;
+               int numBlockCodewords = ecBlocks.ECCodewordsPerBlock + numDataCodewords;
+               result[numResultBlocks++] = new DataBlock(numDataCodewords, new byte[numBlockCodewords]);
+            }
+         }
+
+         // All blocks have the same amount of data, except that the last n
+         // (where n may be 0) have 1 more byte. Figure out where these start.
+         int shorterBlocksTotalCodewords = result[0].codewords.Length;
+         int longerBlocksStartAt = result.Length - 1;
+         while (longerBlocksStartAt >= 0)
+         {
+            int numCodewords = result[longerBlocksStartAt].codewords.Length;
+            if (numCodewords == shorterBlocksTotalCodewords)
+            {
+               break;
+            }
+            longerBlocksStartAt--;
+         }
+         longerBlocksStartAt++;
+
+         int shorterBlocksNumDataCodewords = shorterBlocksTotalCodewords - ecBlocks.ECCodewordsPerBlock;
+         // The last elements of result may be 1 element longer;
+         // first fill out as many elements as all of them have
+         int rawCodewordsOffset = 0;
+         for (int i = 0; i < shorterBlocksNumDataCodewords; i++)
+         {
+            for (int j = 0; j < numResultBlocks; j++)
+            {
+               result[j].codewords[i] = rawCodewords[rawCodewordsOffset++];
+            }
+         }
+         // Fill out the last data block in the longer ones
+         for (int j = longerBlocksStartAt; j < numResultBlocks; j++)
+         {
+            result[j].codewords[shorterBlocksNumDataCodewords] = rawCodewords[rawCodewordsOffset++];
+         }
+         // Now add in error correction blocks
+         int max = result[0].codewords.Length;
+         for (int i = shorterBlocksNumDataCodewords; i < max; i++)
+         {
+            for (int j = 0; j < numResultBlocks; j++)
+            {
+               int iOffset = j < longerBlocksStartAt ? i : i + 1;
+               result[j].codewords[iOffset] = rawCodewords[rawCodewordsOffset++];
+            }
+         }
+         return result;
+      }
+
+      internal int NumDataCodewords
+      {
+         get
+         {
+            return numDataCodewords;
+         }
+      }
+
+      internal byte[] Codewords
+      {
+         get
+         {
+            return codewords;
+         }
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/qrcode/decoder/DataMask.cs

@@ -0,0 +1,165 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using ZXing.Common;
+
+namespace ZXing.QrCode.Internal
+{
+   /// <summary> <p>Encapsulates data masks for the data bits in a QR code, per ISO 18004:2006 6.8. Implementations
+   /// of this class can un-mask a raw BitMatrix. For simplicity, they will unmask the entire BitMatrix,
+   /// including areas used for finder patterns, timing patterns, etc. These areas should be unused
+   /// after the point they are unmasked anyway.</p>
+   /// 
+   /// <p>Note that the diagram in section 6.8.1 is misleading since it indicates that i is column position
+   /// and j is row position. In fact, as the text says, i is row position and j is column position.</p>
+   /// 
+   /// </summary>
+   /// <author>  Sean Owen
+   /// </author>
+   /// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source 
+   /// </author>
+   abstract class DataMask
+   {
+      /// <summary> See ISO 18004:2006 6.8.1</summary>
+      private static readonly DataMask[] DATA_MASKS = new DataMask[]
+                                                         {
+                                                            new DataMask000(),
+                                                            new DataMask001(), 
+                                                            new DataMask010(), 
+                                                            new DataMask011(), 
+                                                            new DataMask100(),
+                                                            new DataMask101(), 
+                                                            new DataMask110(), 
+                                                            new DataMask111()
+                                                         };
+
+      private DataMask()
+      {
+      }
+
+      /// <summary> <p>Implementations of this method reverse the data masking process applied to a QR Code and
+      /// make its bits ready to read.</p>
+      /// 
+      /// </summary>
+      /// <param name="bits">representation of QR Code bits
+      /// </param>
+      /// <param name="dimension">dimension of QR Code, represented by bits, being unmasked
+      /// </param>
+      internal void unmaskBitMatrix(BitMatrix bits, int dimension)
+      {
+         for (int i = 0; i < dimension; i++)
+         {
+            for (int j = 0; j < dimension; j++)
+            {
+               if (isMasked(i, j))
+               {
+                  bits.flip(j, i);
+               }
+            }
+         }
+      }
+
+      internal abstract bool isMasked(int i, int j);
+
+      /// <param name="reference">a value between 0 and 7 indicating one of the eight possible
+      /// data mask patterns a QR Code may use
+      /// </param>
+      /// <returns> {@link DataMask} encapsulating the data mask pattern
+      /// </returns>
+      internal static DataMask forReference(int reference)
+      {
+         if (reference < 0 || reference > 7)
+         {
+            throw new System.ArgumentException();
+         }
+         return DATA_MASKS[reference];
+      }
+
+      /// <summary> 000: mask bits for which (x + y) mod 2 == 0</summary>
+      private sealed class DataMask000 : DataMask
+      {
+         internal override bool isMasked(int i, int j)
+         {
+            return ((i + j) & 0x01) == 0;
+         }
+      }
+
+      /// <summary> 001: mask bits for which x mod 2 == 0</summary>
+      private sealed class DataMask001 : DataMask
+      {
+         internal override bool isMasked(int i, int j)
+         {
+            return (i & 0x01) == 0;
+         }
+      }
+
+      /// <summary> 010: mask bits for which y mod 3 == 0</summary>
+      private sealed class DataMask010 : DataMask
+      {
+         internal override bool isMasked(int i, int j)
+         {
+            return j % 3 == 0;
+         }
+      }
+
+      /// <summary> 011: mask bits for which (x + y) mod 3 == 0</summary>
+      private sealed class DataMask011 : DataMask
+      {
+         internal override bool isMasked(int i, int j)
+         {
+            return (i + j) % 3 == 0;
+         }
+      }
+
+      /// <summary> 100: mask bits for which (x/2 + y/3) mod 2 == 0</summary>
+      private sealed class DataMask100 : DataMask
+      {
+         internal override bool isMasked(int i, int j)
+         {
+            return ((((int)((uint)i >> 1)) + (j / 3)) & 0x01) == 0;
+         }
+      }
+
+      /// <summary> 101: mask bits for which xy mod 2 + xy mod 3 == 0</summary>
+      private sealed class DataMask101 : DataMask
+      {
+         internal override bool isMasked(int i, int j)
+         {
+            int temp = i * j;
+            return (temp & 0x01) + (temp % 3) == 0;
+         }
+      }
+
+      /// <summary> 110: mask bits for which (xy mod 2 + xy mod 3) mod 2 == 0</summary>
+      private sealed class DataMask110 : DataMask
+      {
+         internal override bool isMasked(int i, int j)
+         {
+            int temp = i * j;
+            return (((temp & 0x01) + (temp % 3)) & 0x01) == 0;
+         }
+      }
+
+      /// <summary> 111: mask bits for which ((x+y)mod 2 + xy mod 3) mod 2 == 0</summary>
+      private sealed class DataMask111 : DataMask
+      {
+         internal override bool isMasked(int i, int j)
+         {
+            return ((((i + j) & 0x01) + ((i * j) % 3)) & 0x01) == 0;
+         }
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/qrcode/decoder/DecodedBitStreamParser.cs

@@ -0,0 +1,514 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+using ZXing.Common;
+
+namespace ZXing.QrCode.Internal
+{
+   /// <summary> <p>QR Codes can encode text as bits in one of several modes, and can use multiple modes
+   /// in one QR Code. This class decodes the bits back into text.</p>
+   /// 
+   /// <p>See ISO 18004:2006, 6.4.3 - 6.4.7</p>
+   /// <author>Sean Owen</author>
+   /// </summary>
+   internal static class DecodedBitStreamParser
+   {
+      /// <summary>
+      /// See ISO 18004:2006, 6.4.4 Table 5
+      /// </summary>
+      private static readonly char[] ALPHANUMERIC_CHARS = {
+                                                             '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B',
+                                                             'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
+                                                             'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
+                                                             ' ', '$', '%', '*', '+', '-', '.', '/', ':'
+                                                          };
+      private const int GB2312_SUBSET = 1;
+
+      internal static DecoderResult decode(byte[] bytes,
+                                           Version version,
+                                           ErrorCorrectionLevel ecLevel,
+                                           IDictionary<DecodeHintType, object> hints)
+      {
+         var bits = new BitSource(bytes);
+         var result = new StringBuilder(50);
+         var byteSegments = new List<byte[]>(1);
+         var symbolSequence = -1;
+         var parityData = -1;
+
+         try
+         {
+            // CharacterSetECI currentCharacterSetECI = null;
+            bool fc1InEffect = false;
+            Mode mode;
+            do
+            {
+               // While still another segment to read...
+               if (bits.available() < 4)
+               {
+                  // OK, assume we're done. Really, a TERMINATOR mode should have been recorded here
+                  mode = Mode.TERMINATOR;
+               }
+               else
+               {
+                  try
+                  {
+                     mode = Mode.forBits(bits.readBits(4)); // mode is encoded by 4 bits
+                  }
+                  catch (ArgumentException)
+                  {
+                     return null;
+                  }
+               }
+               if (mode != Mode.TERMINATOR)
+               {
+                  if (mode == Mode.FNC1_FIRST_POSITION || mode == Mode.FNC1_SECOND_POSITION)
+                  {
+                     // We do little with FNC1 except alter the parsed result a bit according to the spec
+                     fc1InEffect = true;
+                  }
+                  else if (mode == Mode.STRUCTURED_APPEND)
+                  {
+                     if (bits.available() < 16)
+                     {
+                        return null;
+                     }
+                     // not really supported; but sequence number and parity is added later to the result metadata
+                     // Read next 8 bits (symbol sequence #) and 8 bits (parity data), then continue
+                     symbolSequence = bits.readBits(8);
+                     parityData = bits.readBits(8);
+                  }
+                  else if (mode == Mode.ECI)
+                  {
+                      /*
+                     // Count doesn't apply to ECI
+                     int value = parseECIValue(bits);
+                     currentCharacterSetECI = CharacterSetECI.getCharacterSetECIByValue(value);
+                     if (currentCharacterSetECI == null)
+                     {
+                        return null;
+                     }
+                       * */
+                  }
+                  else
+                  {
+                     // First handle Hanzi mode which does not start with character count
+                     if (mode == Mode.HANZI)
+                     {
+                        //chinese mode contains a sub set indicator right after mode indicator
+                        int subset = bits.readBits(4);
+                        int countHanzi = bits.readBits(mode.getCharacterCountBits(version));
+                        if (subset == GB2312_SUBSET)
+                        {
+                           if (!decodeHanziSegment(bits, result, countHanzi))
+                              return null;
+                        }
+                     }
+                     else
+                     {
+                        // "Normal" QR code modes:
+                        // How many characters will follow, encoded in this mode?
+                        int count = bits.readBits(mode.getCharacterCountBits(version));
+                        if (mode == Mode.NUMERIC)
+                        {
+                           if (!decodeNumericSegment(bits, result, count))
+                              return null;
+                        }
+                        else if (mode == Mode.ALPHANUMERIC)
+                        {
+                           if (!decodeAlphanumericSegment(bits, result, count, fc1InEffect))
+                              return null;
+                        }
+                        else if (mode == Mode.BYTE)
+                        {
+                           if (!decodeByteSegment(bits, result, count, byteSegments, hints))
+                              return null;
+                        }
+                        else if (mode == Mode.KANJI)
+                        {
+                           if (!decodeKanjiSegment(bits, result, count))
+                              return null;
+                        }
+                        else
+                        {
+                           return null;
+                        }
+                     }
+                  }
+               }
+            } while (mode != Mode.TERMINATOR);
+         }
+         catch (ArgumentException)
+         {
+            // from readBits() calls
+            return null;
+         }
+
+#if WindowsCE
+         var resultString = result.ToString().Replace("\n", "\r\n");
+#else
+         var resultString = result.ToString().Replace("\r\n", "\n").Replace("\n", Environment.NewLine);
+#endif
+         return new DecoderResult(bytes,
+                                  resultString,
+                                  byteSegments.Count == 0 ? null : byteSegments,
+                                  ecLevel == null ? null : ecLevel.ToString(),
+                                  symbolSequence, parityData);
+      }
+
+      /// <summary>
+      /// See specification GBT 18284-2000
+      /// </summary>
+      /// <param name="bits">The bits.</param>
+      /// <param name="result">The result.</param>
+      /// <param name="count">The count.</param>
+      /// <returns></returns>
+      private static bool decodeHanziSegment(BitSource bits,
+                                             StringBuilder result,
+                                             int count)
+      {
+         // Don't crash trying to read more bits than we have available.
+         if (count * 13 > bits.available())
+         {
+            return false;
+         }
+
+         // Each character will require 2 bytes. Read the characters as 2-byte pairs
+         // and decode as GB2312 afterwards
+         byte[] buffer = new byte[2 * count];
+         int offset = 0;
+         while (count > 0)
+         {
+            // Each 13 bits encodes a 2-byte character
+            int twoBytes = bits.readBits(13);
+            int assembledTwoBytes = ((twoBytes / 0x060) << 8) | (twoBytes % 0x060);
+            if (assembledTwoBytes < 0x003BF)
+            {
+               // In the 0xA1A1 to 0xAAFE range
+               assembledTwoBytes += 0x0A1A1;
+            }
+            else
+            {
+               // In the 0xB0A1 to 0xFAFE range
+               assembledTwoBytes += 0x0A6A1;
+            }
+            buffer[offset] = (byte)((assembledTwoBytes >> 8) & 0xFF);
+            buffer[offset + 1] = (byte)(assembledTwoBytes & 0xFF);
+            offset += 2;
+            count--;
+         }
+
+         try
+         {
+            result.Append(Encoding.GetEncoding(StringUtils.GB2312).GetString(buffer, 0, buffer.Length));
+         }
+#if (WINDOWS_PHONE70 || WINDOWS_PHONE71 || SILVERLIGHT4 || SILVERLIGHT5 || NETFX_CORE || MONOANDROID || MONOTOUCH)
+         catch (ArgumentException)
+         {
+            try
+            {
+               // Silverlight only supports a limited number of character sets, trying fallback to UTF-8
+               result.Append(Encoding.GetEncoding("UTF-8").GetString(buffer, 0, buffer.Length));
+            }
+            catch (Exception)
+            {
+               return false;
+            }
+         }
+#endif
+         catch (Exception)
+         {
+            return false;
+         }
+
+         return true;
+      }
+
+      private static bool decodeKanjiSegment(BitSource bits,
+                                             StringBuilder result,
+                                             int count)
+      {
+         // Don't crash trying to read more bits than we have available.
+         if (count * 13 > bits.available())
+         {
+            return false;
+         }
+
+         // Each character will require 2 bytes. Read the characters as 2-byte pairs
+         // and decode as Shift_JIS afterwards
+         byte[] buffer = new byte[2 * count];
+         int offset = 0;
+         while (count > 0)
+         {
+            // Each 13 bits encodes a 2-byte character
+            int twoBytes = bits.readBits(13);
+            int assembledTwoBytes = ((twoBytes / 0x0C0) << 8) | (twoBytes % 0x0C0);
+            if (assembledTwoBytes < 0x01F00)
+            {
+               // In the 0x8140 to 0x9FFC range
+               assembledTwoBytes += 0x08140;
+            }
+            else
+            {
+               // In the 0xE040 to 0xEBBF range
+               assembledTwoBytes += 0x0C140;
+            }
+            buffer[offset] = (byte)(assembledTwoBytes >> 8);
+            buffer[offset + 1] = (byte)assembledTwoBytes;
+            offset += 2;
+            count--;
+         }
+         // Shift_JIS may not be supported in some environments:
+         try
+         {
+            result.Append(Encoding.GetEncoding(StringUtils.SHIFT_JIS).GetString(buffer, 0, buffer.Length));
+         }
+#if (WINDOWS_PHONE70 || WINDOWS_PHONE71 || SILVERLIGHT4 || SILVERLIGHT5 || NETFX_CORE || MONOANDROID || MONOTOUCH)
+         catch (ArgumentException)
+         {
+            try
+            {
+               // Silverlight only supports a limited number of character sets, trying fallback to UTF-8
+               result.Append(Encoding.GetEncoding("UTF-8").GetString(buffer, 0, buffer.Length));
+            }
+            catch (Exception)
+            {
+               return false;
+            }
+         }
+#endif
+         catch (Exception)
+         {
+            return false;
+         }
+         return true;
+      }
+
+      private static bool decodeByteSegment(BitSource bits,
+                                            StringBuilder result,
+                                            int count,
+                                            IList<byte[]> byteSegments,
+                                            IDictionary<DecodeHintType, object> hints)
+      {
+         // Don't crash trying to read more bits than we have available.
+         if (count << 3 > bits.available())
+         {
+            return false;
+         }
+
+         byte[] readBytes = new byte[count];
+         for (int i = 0; i < count; i++)
+         {
+            readBytes[i] = (byte)bits.readBits(8);
+         }
+         String encoding;
+         encoding = StringUtils.guessEncoding(readBytes, hints);
+        
+         try
+         {
+            result.Append(Encoding.GetEncoding(encoding).GetString(readBytes, 0, readBytes.Length));
+         }
+#if (WINDOWS_PHONE70 || WINDOWS_PHONE71 || SILVERLIGHT4 || SILVERLIGHT5 || NETFX_CORE || MONOANDROID || MONOTOUCH)
+         catch (ArgumentException)
+         {
+            try
+            {
+               // Silverlight only supports a limited number of character sets, trying fallback to UTF-8
+               result.Append(Encoding.GetEncoding("UTF-8").GetString(readBytes, 0, readBytes.Length));
+            }
+            catch (Exception)
+            {
+               return false;
+            }
+         }
+#endif
+#if WindowsCE
+         catch (PlatformNotSupportedException)
+         {
+            try
+            {
+               // WindowsCE doesn't support all encodings. But it is device depended.
+               // So we try here the some different ones
+               if (encoding == "ISO-8859-1")
+               {
+                  result.Append(Encoding.GetEncoding(1252).GetString(readBytes, 0, readBytes.Length));
+               }
+               else
+               {
+                  result.Append(Encoding.GetEncoding("UTF-8").GetString(readBytes, 0, readBytes.Length));
+               }
+            }
+            catch (Exception)
+            {
+               return false;
+            }
+         }
+#endif
+         catch (Exception)
+         {
+            return false;
+         }
+         byteSegments.Add(readBytes);
+
+         return true;
+      }
+
+      private static char toAlphaNumericChar(int value)
+      {
+         if (value >= ALPHANUMERIC_CHARS.Length)
+         {
+            //throw FormatException.Instance;
+         }
+         return ALPHANUMERIC_CHARS[value];
+      }
+
+      private static bool decodeAlphanumericSegment(BitSource bits,
+                                                    StringBuilder result,
+                                                    int count,
+                                                    bool fc1InEffect)
+      {
+         // Read two characters at a time
+         int start = result.Length;
+         while (count > 1)
+         {
+            if (bits.available() < 11)
+            {
+               return false;
+            }
+            int nextTwoCharsBits = bits.readBits(11);
+            result.Append(toAlphaNumericChar(nextTwoCharsBits / 45));
+            result.Append(toAlphaNumericChar(nextTwoCharsBits % 45));
+            count -= 2;
+         }
+         if (count == 1)
+         {
+            // special case: one character left
+            if (bits.available() < 6)
+            {
+               return false;
+            }
+            result.Append(toAlphaNumericChar(bits.readBits(6)));
+         }
+
+         // See section 6.4.8.1, 6.4.8.2
+         if (fc1InEffect)
+         {
+            // We need to massage the result a bit if in an FNC1 mode:
+            for (int i = start; i < result.Length; i++)
+            {
+               if (result[i] == '%')
+               {
+                  if (i < result.Length - 1 && result[i + 1] == '%')
+                  {
+                     // %% is rendered as %
+                     result.Remove(i + 1, 1);
+                  }
+                  else
+                  {
+                     // In alpha mode, % should be converted to FNC1 separator 0x1D
+                     result.Remove(i, 1);
+                     result.Insert(i, new[] { (char)0x1D });
+                  }
+               }
+            }
+         }
+
+         return true;
+      }
+
+      private static bool decodeNumericSegment(BitSource bits,
+                                               StringBuilder result,
+                                               int count)
+      {
+         // Read three digits at a time
+         while (count >= 3)
+         {
+            // Each 10 bits encodes three digits
+            if (bits.available() < 10)
+            {
+               return false;
+            }
+            int threeDigitsBits = bits.readBits(10);
+            if (threeDigitsBits >= 1000)
+            {
+               return false;
+            }
+            result.Append(toAlphaNumericChar(threeDigitsBits / 100));
+            result.Append(toAlphaNumericChar((threeDigitsBits / 10) % 10));
+            result.Append(toAlphaNumericChar(threeDigitsBits % 10));
+
+            count -= 3;
+         }
+         if (count == 2)
+         {
+            // Two digits left over to read, encoded in 7 bits
+            if (bits.available() < 7)
+            {
+               return false;
+            }
+            int twoDigitsBits = bits.readBits(7);
+            if (twoDigitsBits >= 100)
+            {
+               return false;
+            }
+            result.Append(toAlphaNumericChar(twoDigitsBits / 10));
+            result.Append(toAlphaNumericChar(twoDigitsBits % 10));
+         }
+         else if (count == 1)
+         {
+            // One digit left over to read
+            if (bits.available() < 4)
+            {
+               return false;
+            }
+            int digitBits = bits.readBits(4);
+            if (digitBits >= 10)
+            {
+               return false;
+            }
+            result.Append(toAlphaNumericChar(digitBits));
+         }
+
+         return true;
+      }
+
+      private static int parseECIValue(BitSource bits)
+      {
+         int firstByte = bits.readBits(8);
+         if ((firstByte & 0x80) == 0)
+         {
+            // just one byte
+            return firstByte & 0x7F;
+         }
+         if ((firstByte & 0xC0) == 0x80)
+         {
+            // two bytes
+            int secondByte = bits.readBits(8);
+            return ((firstByte & 0x3F) << 8) | secondByte;
+         }
+         if ((firstByte & 0xE0) == 0xC0)
+         {
+            // three bytes
+            int secondThirdBytes = bits.readBits(16);
+            return ((firstByte & 0x1F) << 16) | secondThirdBytes;
+         }
+         throw new ArgumentException("Bad ECI bits starting with byte " + firstByte);
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/qrcode/decoder/Decoder.cs

@@ -0,0 +1,195 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System.Collections.Generic;
+
+using ZXing.Common;
+using ZXing.Common.ReedSolomon;
+
+namespace ZXing.QrCode.Internal
+{
+   /// <summary>
+   ///   <p>The main class which implements QR Code decoding -- as opposed to locating and extracting
+   /// the QR Code from an image.</p>
+   /// </summary>
+   /// <author>
+   /// Sean Owen
+   /// </author>
+   public sealed class Decoder
+   {
+      private readonly ReedSolomonDecoder rsDecoder;
+
+      /// <summary>
+      /// Initializes a new instance of the <see cref="Decoder"/> class.
+      /// </summary>
+      public Decoder()
+      {
+         rsDecoder = new ReedSolomonDecoder(GenericGF.QR_CODE_FIELD_256);
+      }
+
+      /// <summary>
+      ///   <p>Convenience method that can decode a QR Code represented as a 2D array of booleans.
+      /// "true" is taken to mean a black module.</p>
+      /// </summary>
+      /// <param name="image">booleans representing white/black QR Code modules</param>
+      /// <param name="hints">The hints.</param>
+      /// <returns>
+      /// text and bytes encoded within the QR Code
+      /// </returns>
+      public DecoderResult decode(bool[][] image, IDictionary<DecodeHintType, object> hints)
+      {
+         var dimension = image.Length;
+         var bits = new BitMatrix(dimension);
+         for (int i = 0; i < dimension; i++)
+         {
+            for (int j = 0; j < dimension; j++)
+            {
+               bits[j, i] = image[i][j];
+            }
+         }
+         return decode(bits, hints);
+      }
+
+      /// <summary>
+      ///   <p>Decodes a QR Code represented as a {@link BitMatrix}. A 1 or "true" is taken to mean a black module.</p>
+      /// </summary>
+      /// <param name="bits">booleans representing white/black QR Code modules</param>
+      /// <param name="hints">The hints.</param>
+      /// <returns>
+      /// text and bytes encoded within the QR Code
+      /// </returns>
+      public DecoderResult decode(BitMatrix bits, IDictionary<DecodeHintType, object> hints)
+      {
+         // Construct a parser and read version, error-correction level
+         var parser = BitMatrixParser.createBitMatrixParser(bits);
+         if (parser == null)
+            return null;
+
+         var result = decode(parser, hints);
+         if (result == null)
+         {
+            // Revert the bit matrix
+            parser.remask();
+
+            // Will be attempting a mirrored reading of the version and format info.
+            parser.setMirror(true);
+
+            // Preemptively read the version.
+            var version = parser.readVersion();
+            if (version == null)
+               return null;
+
+            // Preemptively read the format information.
+            var formatinfo = parser.readFormatInformation();
+            if (formatinfo == null)
+               return null;
+
+            /*
+             * Since we're here, this means we have successfully detected some kind
+             * of version and format information when mirrored. This is a good sign,
+             * that the QR code may be mirrored, and we should try once more with a
+             * mirrored content.
+             */
+            // Prepare for a mirrored reading.
+            parser.mirror();
+
+            result = decode(parser, hints);
+
+            if (result != null)
+            {
+               // Success! Notify the caller that the code was mirrored.
+               result.Other = new QRCodeDecoderMetaData(true);
+            }
+         }
+
+         return result;
+      }
+
+      private DecoderResult decode(BitMatrixParser parser, IDictionary<DecodeHintType, object> hints)
+      {
+         Version version = parser.readVersion();
+         if (version == null)
+            return null;
+         var formatinfo = parser.readFormatInformation();
+         if (formatinfo == null)
+            return null;
+         ErrorCorrectionLevel ecLevel = formatinfo.ErrorCorrectionLevel;
+
+         // Read codewords
+         byte[] codewords = parser.readCodewords();
+         if (codewords == null)
+            return null;
+         // Separate into data blocks
+         DataBlock[] dataBlocks = DataBlock.getDataBlocks(codewords, version, ecLevel);
+
+         // Count total number of data bytes
+         int totalBytes = 0;
+         foreach (var dataBlock in dataBlocks)
+         {
+            totalBytes += dataBlock.NumDataCodewords;
+         }
+         byte[] resultBytes = new byte[totalBytes];
+         int resultOffset = 0;
+
+         // Error-correct and copy data blocks together into a stream of bytes
+         foreach (var dataBlock in dataBlocks)
+         {
+            byte[] codewordBytes = dataBlock.Codewords;
+            int numDataCodewords = dataBlock.NumDataCodewords;
+            if (!correctErrors(codewordBytes, numDataCodewords))
+               return null;
+            for (int i = 0; i < numDataCodewords; i++)
+            {
+               resultBytes[resultOffset++] = codewordBytes[i];
+            }
+         }
+
+         // Decode the contents of that stream of bytes
+         return DecodedBitStreamParser.decode(resultBytes, version, ecLevel, hints);
+      }
+
+      /// <summary>
+      ///   <p>Given data and error-correction codewords received, possibly corrupted by errors, attempts to
+      /// correct the errors in-place using Reed-Solomon error correction.</p>
+      /// </summary>
+      /// <param name="codewordBytes">data and error correction codewords</param>
+      /// <param name="numDataCodewords">number of codewords that are data bytes</param>
+      /// <returns></returns>
+      private bool correctErrors(byte[] codewordBytes, int numDataCodewords)
+      {
+         int numCodewords = codewordBytes.Length;
+         // First read into an array of ints
+         int[] codewordsInts = new int[numCodewords];
+         for (int i = 0; i < numCodewords; i++)
+         {
+            codewordsInts[i] = codewordBytes[i] & 0xFF;
+         }
+         int numECCodewords = codewordBytes.Length - numDataCodewords;
+
+         if (!rsDecoder.decode(codewordsInts, numECCodewords))
+            return false;
+
+         // Copy back into array of bytes -- only need to worry about the bytes that were data
+         // We don't care about errors in the error-correction codewords
+         for (int i = 0; i < numDataCodewords; i++)
+         {
+            codewordBytes[i] = (byte)codewordsInts[i];
+         }
+
+         return true;
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/qrcode/decoder/FormatInformation.cs

@@ -0,0 +1,197 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+
+namespace ZXing.QrCode.Internal
+{
+
+   /// <summary> <p>Encapsulates a QR Code's format information, including the data mask used and
+   /// error correction level.</p>
+   /// 
+   /// </summary>
+   /// <author>  Sean Owen
+   /// </author>
+   /// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source 
+   /// </author>
+   /// <seealso cref="DataMask">
+   /// </seealso>
+   /// <seealso cref="ErrorCorrectionLevel">
+   /// </seealso>
+   sealed class FormatInformation
+   {
+      private const int FORMAT_INFO_MASK_QR = 0x5412;
+
+      /// <summary> See ISO 18004:2006, Annex C, Table C.1</summary>
+      private static readonly int[][] FORMAT_INFO_DECODE_LOOKUP = new int[][]
+                                                                     {
+                                                                        new [] { 0x5412, 0x00 },
+                                                                        new [] { 0x5125, 0x01 },
+                                                                        new [] { 0x5E7C, 0x02 },
+                                                                        new [] { 0x5B4B, 0x03 },
+                                                                        new [] { 0x45F9, 0x04 },
+                                                                        new [] { 0x40CE, 0x05 },
+                                                                        new [] { 0x4F97, 0x06 },
+                                                                        new [] { 0x4AA0, 0x07 },
+                                                                        new [] { 0x77C4, 0x08 },
+                                                                        new [] { 0x72F3, 0x09 },
+                                                                        new [] { 0x7DAA, 0x0A },
+                                                                        new [] { 0x789D, 0x0B },
+                                                                        new [] { 0x662F, 0x0C },
+                                                                        new [] { 0x6318, 0x0D },
+                                                                        new [] { 0x6C41, 0x0E },
+                                                                        new [] { 0x6976, 0x0F },
+                                                                        new [] { 0x1689, 0x10 },
+                                                                        new [] { 0x13BE, 0x11 },
+                                                                        new [] { 0x1CE7, 0x12 },
+                                                                        new [] { 0x19D0, 0x13 },
+                                                                        new [] { 0x0762, 0x14 },
+                                                                        new [] { 0x0255, 0x15 },
+                                                                        new [] { 0x0D0C, 0x16 },
+                                                                        new [] { 0x083B, 0x17 },
+                                                                        new [] { 0x355F, 0x18 },
+                                                                        new [] { 0x3068, 0x19 },
+                                                                        new [] { 0x3F31, 0x1A }, 
+                                                                        new [] { 0x3A06, 0x1B },
+                                                                        new [] { 0x24B4, 0x1C },
+                                                                        new [] { 0x2183, 0x1D },
+                                                                        new [] { 0x2EDA, 0x1E }, 
+                                                                        new [] { 0x2BED, 0x1F }
+                                                                     };
+
+      /// <summary> Offset i holds the number of 1 bits in the binary representation of i</summary>
+      private static readonly int[] BITS_SET_IN_HALF_BYTE = new [] 
+         { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4 };
+
+      private readonly ErrorCorrectionLevel errorCorrectionLevel;
+      private readonly byte dataMask;
+
+      private FormatInformation(int formatInfo)
+      {
+         // Bits 3,4
+         errorCorrectionLevel = ErrorCorrectionLevel.forBits((formatInfo >> 3) & 0x03);
+         // Bottom 3 bits
+         dataMask = (byte)(formatInfo & 0x07);
+      }
+
+      internal static int numBitsDiffering(int a, int b)
+      {
+         a ^= b; // a now has a 1 bit exactly where its bit differs with b's
+         // Count bits set quickly with a series of lookups:
+         return BITS_SET_IN_HALF_BYTE[a & 0x0F] +
+            BITS_SET_IN_HALF_BYTE[(((int)((uint)a >> 4)) & 0x0F)] +
+            BITS_SET_IN_HALF_BYTE[(((int)((uint)a >> 8)) & 0x0F)] +
+            BITS_SET_IN_HALF_BYTE[(((int)((uint)a >> 12)) & 0x0F)] +
+            BITS_SET_IN_HALF_BYTE[(((int)((uint)a >> 16)) & 0x0F)] +
+            BITS_SET_IN_HALF_BYTE[(((int)((uint)a >> 20)) & 0x0F)] +
+            BITS_SET_IN_HALF_BYTE[(((int)((uint)a >> 24)) & 0x0F)] +
+            BITS_SET_IN_HALF_BYTE[(((int)((uint)a >> 28)) & 0x0F)];
+      }
+
+      /// <summary>
+      /// Decodes the format information.
+      /// </summary>
+      /// <param name="maskedFormatInfo1">format info indicator, with mask still applied</param>
+      /// <param name="maskedFormatInfo2">The masked format info2.</param>
+      /// <returns>
+      /// information about the format it specifies, or <code>null</code>
+      /// if doesn't seem to match any known pattern
+      /// </returns>
+      internal static FormatInformation decodeFormatInformation(int maskedFormatInfo1, int maskedFormatInfo2)
+      {
+         FormatInformation formatInfo = doDecodeFormatInformation(maskedFormatInfo1, maskedFormatInfo2);
+         if (formatInfo != null)
+         {
+            return formatInfo;
+         }
+         // Should return null, but, some QR codes apparently
+         // do not mask this info. Try again by actually masking the pattern
+         // first
+         return doDecodeFormatInformation(maskedFormatInfo1 ^ FORMAT_INFO_MASK_QR,
+                                          maskedFormatInfo2 ^ FORMAT_INFO_MASK_QR);
+      }
+
+      private static FormatInformation doDecodeFormatInformation(int maskedFormatInfo1, int maskedFormatInfo2)
+      {
+         // Find the int in FORMAT_INFO_DECODE_LOOKUP with fewest bits differing
+         int bestDifference = Int32.MaxValue;
+         int bestFormatInfo = 0;
+         foreach (var decodeInfo in FORMAT_INFO_DECODE_LOOKUP)
+         {
+            int targetInfo = decodeInfo[0];
+            if (targetInfo == maskedFormatInfo1 || targetInfo == maskedFormatInfo2)
+            {
+               // Found an exact match
+               return new FormatInformation(decodeInfo[1]);
+            }
+            int bitsDifference = numBitsDiffering(maskedFormatInfo1, targetInfo);
+            if (bitsDifference < bestDifference)
+            {
+               bestFormatInfo = decodeInfo[1];
+               bestDifference = bitsDifference;
+            }
+            if (maskedFormatInfo1 != maskedFormatInfo2)
+            {
+               // also try the other option
+               bitsDifference = numBitsDiffering(maskedFormatInfo2, targetInfo);
+               if (bitsDifference < bestDifference)
+               {
+                  bestFormatInfo = decodeInfo[1];
+                  bestDifference = bitsDifference;
+               }
+            }
+         }
+         // Hamming distance of the 32 masked codes is 7, by construction, so <= 3 bits
+         // differing means we found a match
+         if (bestDifference <= 3)
+         {
+            return new FormatInformation(bestFormatInfo);
+         }
+         return null;
+      }
+
+      internal ErrorCorrectionLevel ErrorCorrectionLevel
+      {
+         get
+         {
+            return errorCorrectionLevel;
+         }
+      }
+
+      internal byte DataMask
+      {
+         get
+         {
+            return dataMask;
+         }
+      }
+
+      public override int GetHashCode()
+      {
+         return (errorCorrectionLevel.ordinal() << 3) | dataMask;
+      }
+
+      public override bool Equals(Object o)
+      {
+         if (!(o is FormatInformation))
+         {
+            return false;
+         }
+         var other = (FormatInformation)o;
+         return errorCorrectionLevel == other.errorCorrectionLevel && dataMask == other.dataMask;
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/Mode.cs → shadowsocks-csharp/3rd/zxing/qrcode/decoder/Mode.cs

@@ -41,7 +41,41 @@ namespace ZXing.QrCode.Internal
       /// <summary>
       /// 
       /// </summary>
+      public static readonly Mode TERMINATOR = new Mode(new int[] { 0, 0, 0 }, 0x00, "TERMINATOR"); // Not really a mode...
+      /// <summary>
+      /// 
+      /// </summary>
+      public static readonly Mode NUMERIC = new Mode(new int[] { 10, 12, 14 }, 0x01, "NUMERIC");
+      /// <summary>
+      /// 
+      /// </summary>
+      public static readonly Mode ALPHANUMERIC = new Mode(new int[] { 9, 11, 13 }, 0x02, "ALPHANUMERIC");
+      /// <summary>
+      /// 
+      /// </summary>
+      public static readonly Mode STRUCTURED_APPEND = new Mode(new int[] { 0, 0, 0 }, 0x03, "STRUCTURED_APPEND"); // Not supported
+      /// <summary>
+      /// 
+      /// </summary>
       public static readonly Mode BYTE = new Mode(new int[] { 8, 16, 16 }, 0x04, "BYTE");
+      /// <summary>
+      /// 
+      /// </summary>
+      public static readonly Mode ECI = new Mode(null, 0x07, "ECI"); // character counts don't apply
+      /// <summary>
+      /// 
+      /// </summary>
+      public static readonly Mode KANJI = new Mode(new int[] { 8, 10, 12 }, 0x08, "KANJI");
+      /// <summary>
+      /// 
+      /// </summary>
+      public static readonly Mode FNC1_FIRST_POSITION = new Mode(null, 0x05, "FNC1_FIRST_POSITION");
+      /// <summary>
+      /// 
+      /// </summary>
+      public static readonly Mode FNC1_SECOND_POSITION = new Mode(null, 0x09, "FNC1_SECOND_POSITION");
+      /// <summary>See GBT 18284-2000; "Hanzi" is a transliteration of this mode name.</summary>
+      public static readonly Mode HANZI = new Mode(new int[] { 8, 10, 12 }, 0x0D, "HANZI");
 
       private readonly int[] characterCountBitsForVersions;
       private readonly int bits;
@@ -66,8 +100,27 @@ namespace ZXing.QrCode.Internal
       {
          switch (bits)
          {
+            case 0x0:
+               return TERMINATOR;
+            case 0x1:
+               return NUMERIC;
+            case 0x2:
+               return ALPHANUMERIC;
+            case 0x3:
+               return STRUCTURED_APPEND;
             case 0x4:
                return BYTE;
+            case 0x5:
+               return FNC1_FIRST_POSITION;
+            case 0x7:
+               return ECI;
+            case 0x8:
+               return KANJI;
+            case 0x9:
+               return FNC1_SECOND_POSITION;
+            case 0xD:
+               // 0xD is defined in GBT 18284-2000, may not be supported in foreign country
+               return HANZI;
             default:
                throw new ArgumentException();
          }
@@ -111,5 +164,16 @@ namespace ZXing.QrCode.Internal
             return bits;
          }
       }
+
+      /// <summary>
+      /// Returns a <see cref="System.String"/> that represents this instance.
+      /// </summary>
+      /// <returns>
+      /// A <see cref="System.String"/> that represents this instance.
+      /// </returns>
+      public override String ToString()
+      {
+         return name;
+      }
    }
 }

shadowsocks-csharp/3rd/zxing/qrcode/decoder/QRCodeDecoderMetaData.cs

@@ -0,0 +1,60 @@
+/*
+ * Copyright 2013 ZXing authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+namespace ZXing.QrCode.Internal
+{
+   /// <summary>
+   /// Meta-data container for QR Code decoding. Instances of this class may be used to convey information back to the
+   /// decoding caller. Callers are expected to process this.
+   /// </summary>
+   public sealed class QRCodeDecoderMetaData
+   {
+      private readonly bool mirrored;
+
+      /// <summary>
+      /// Initializes a new instance of the <see cref="QRCodeDecoderMetaData"/> class.
+      /// </summary>
+      /// <param name="mirrored">if set to <c>true</c> [mirrored].</param>
+      public QRCodeDecoderMetaData(bool mirrored)
+      {
+         this.mirrored = mirrored;
+      }
+
+      /// <summary>
+      /// true if the QR Code was mirrored. 
+      /// </summary>
+      public bool IsMirrored
+      {
+         get { return mirrored; }
+      }
+
+      /// <summary>
+      /// Apply the result points' order correction due to mirroring.
+      /// </summary>
+      /// <param name="points">Array of points to apply mirror correction to.</param>
+      public void applyMirroredCorrection(ResultPoint[] points)
+      {
+         if (!mirrored || points == null || points.Length < 3)
+         {
+            return;
+         }
+         ResultPoint bottomLeft = points[0];
+         points[0] = points[2];
+         points[2] = bottomLeft;
+         // No need to 'fix' top-left and alignment pattern.
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/qrcode/decoder/Version.cs

@@ -0,0 +1,424 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+
+using ZXing.Common;
+
+namespace ZXing.QrCode.Internal
+{
+   /// <summary>
+   /// See ISO 18004:2006 Annex D
+   /// </summary>
+   /// <author>Sean Owen</author>
+   public sealed class Version
+   {
+      /// <summary> See ISO 18004:2006 Annex D.
+      /// Element i represents the raw version bits that specify version i + 7
+      /// </summary>
+      private static readonly int[] VERSION_DECODE_INFO = new[]
+                                                             {
+                                                                0x07C94, 0x085BC, 0x09A99, 0x0A4D3, 0x0BBF6,
+                                                                0x0C762, 0x0D847, 0x0E60D, 0x0F928, 0x10B78,
+                                                                0x1145D, 0x12A17, 0x13532, 0x149A6, 0x15683, 
+                                                                0x168C9, 0x177EC, 0x18EC4, 0x191E1, 0x1AFAB, 
+                                                                0x1B08E, 0x1CC1A, 0x1D33F, 0x1ED75, 0x1F250, 
+                                                                0x209D5, 0x216F0, 0x228BA, 0x2379F, 0x24B0B, 
+                                                                0x2542E, 0x26A64, 0x27541, 0x28C69
+                                                             };
+
+      private static readonly Version[] VERSIONS = buildVersions();
+
+      private readonly int versionNumber;
+      private readonly int[] alignmentPatternCenters;
+      private readonly ECBlocks[] ecBlocks;
+      private readonly int totalCodewords;
+
+      private Version(int versionNumber, int[] alignmentPatternCenters, params ECBlocks[] ecBlocks)
+      {
+         this.versionNumber = versionNumber;
+         this.alignmentPatternCenters = alignmentPatternCenters;
+         this.ecBlocks = ecBlocks;
+         int total = 0;
+         int ecCodewords = ecBlocks[0].ECCodewordsPerBlock;
+         ECB[] ecbArray = ecBlocks[0].getECBlocks();
+         foreach (var ecBlock in ecbArray)
+         {
+            total += ecBlock.Count * (ecBlock.DataCodewords + ecCodewords);
+         }
+         this.totalCodewords = total;
+      }
+
+      /// <summary>
+      /// Gets the version number.
+      /// </summary>
+      public int VersionNumber
+      {
+         get
+         {
+            return versionNumber;
+         }
+
+      }
+
+      /// <summary>
+      /// Gets the alignment pattern centers.
+      /// </summary>
+      public int[] AlignmentPatternCenters
+      {
+         get
+         {
+            return alignmentPatternCenters;
+         }
+
+      }
+
+      /// <summary>
+      /// Gets the total codewords.
+      /// </summary>
+      public int TotalCodewords
+      {
+         get
+         {
+            return totalCodewords;
+         }
+
+      }
+
+      /// <summary>
+      /// Gets the dimension for version.
+      /// </summary>
+      public int DimensionForVersion
+      {
+         get
+         {
+            return 17 + 4 * versionNumber;
+         }
+
+      }
+
+      /// <summary>
+      /// Gets the EC blocks for level.
+      /// </summary>
+      /// <param name="ecLevel">The ec level.</param>
+      /// <returns></returns>
+      public ECBlocks getECBlocksForLevel(ErrorCorrectionLevel ecLevel)
+      {
+         return ecBlocks[ecLevel.ordinal()];
+      }
+
+      /// <summary> <p>Deduces version information purely from QR Code dimensions.</p>
+      /// 
+      /// </summary>
+      /// <param name="dimension">dimension in modules
+      /// </param>
+      /// <returns><see cref="Version" /> for a QR Code of that dimension or null</returns>
+      public static Version getProvisionalVersionForDimension(int dimension)
+      {
+         if (dimension % 4 != 1)
+         {
+            return null;
+         }
+         try
+         {
+            return getVersionForNumber((dimension - 17) >> 2);
+         }
+         catch (ArgumentException)
+         {
+            return null;
+         }
+      }
+
+      /// <summary>
+      /// Gets the version for number.
+      /// </summary>
+      /// <param name="versionNumber">The version number.</param>
+      /// <returns></returns>
+      public static Version getVersionForNumber(int versionNumber)
+      {
+         if (versionNumber < 1 || versionNumber > 40)
+         {
+            throw new ArgumentException();
+         }
+         return VERSIONS[versionNumber - 1];
+      }
+
+      internal static Version decodeVersionInformation(int versionBits)
+      {
+         int bestDifference = Int32.MaxValue;
+         int bestVersion = 0;
+         for (int i = 0; i < VERSION_DECODE_INFO.Length; i++)
+         {
+            int targetVersion = VERSION_DECODE_INFO[i];
+            // Do the version info bits match exactly? done.
+            if (targetVersion == versionBits)
+            {
+               return getVersionForNumber(i + 7);
+            }
+            // Otherwise see if this is the closest to a real version info bit string
+            // we have seen so far
+            int bitsDifference = FormatInformation.numBitsDiffering(versionBits, targetVersion);
+            if (bitsDifference < bestDifference)
+            {
+               bestVersion = i + 7;
+               bestDifference = bitsDifference;
+            }
+         }
+         // We can tolerate up to 3 bits of error since no two version info codewords will
+         // differ in less than 8 bits.
+         if (bestDifference <= 3)
+         {
+            return getVersionForNumber(bestVersion);
+         }
+         // If we didn't find a close enough match, fail
+         return null;
+      }
+
+      /// <summary> See ISO 18004:2006 Annex E</summary>
+      internal BitMatrix buildFunctionPattern()
+      {
+         int dimension = DimensionForVersion;
+         BitMatrix bitMatrix = new BitMatrix(dimension);
+
+         // Top left finder pattern + separator + format
+         bitMatrix.setRegion(0, 0, 9, 9);
+         // Top right finder pattern + separator + format
+         bitMatrix.setRegion(dimension - 8, 0, 8, 9);
+         // Bottom left finder pattern + separator + format
+         bitMatrix.setRegion(0, dimension - 8, 9, 8);
+
+         // Alignment patterns
+         int max = alignmentPatternCenters.Length;
+         for (int x = 0; x < max; x++)
+         {
+            int i = alignmentPatternCenters[x] - 2;
+            for (int y = 0; y < max; y++)
+            {
+               if ((x == 0 && (y == 0 || y == max - 1)) || (x == max - 1 && y == 0))
+               {
+                  // No alignment patterns near the three finder paterns
+                  continue;
+               }
+               bitMatrix.setRegion(alignmentPatternCenters[y] - 2, i, 5, 5);
+            }
+         }
+
+         // Vertical timing pattern
+         bitMatrix.setRegion(6, 9, 1, dimension - 17);
+         // Horizontal timing pattern
+         bitMatrix.setRegion(9, 6, dimension - 17, 1);
+
+         if (versionNumber > 6)
+         {
+            // Version info, top right
+            bitMatrix.setRegion(dimension - 11, 0, 3, 6);
+            // Version info, bottom left
+            bitMatrix.setRegion(0, dimension - 11, 6, 3);
+         }
+
+         return bitMatrix;
+      }
+
+      /// <summary> <p>Encapsulates a set of error-correction blocks in one symbol version. Most versions will
+      /// use blocks of differing sizes within one version, so, this encapsulates the parameters for
+      /// each set of blocks. It also holds the number of error-correction codewords per block since it
+      /// will be the same across all blocks within one version.</p>
+      /// </summary>
+      public sealed class ECBlocks
+      {
+         private readonly int ecCodewordsPerBlock;
+         private readonly ECB[] ecBlocks;
+
+         internal ECBlocks(int ecCodewordsPerBlock, params ECB[] ecBlocks)
+         {
+            this.ecCodewordsPerBlock = ecCodewordsPerBlock;
+            this.ecBlocks = ecBlocks;
+         }
+
+         /// <summary>
+         /// Gets the EC codewords per block.
+         /// </summary>
+         public int ECCodewordsPerBlock
+         {
+            get
+            {
+               return ecCodewordsPerBlock;
+            }
+         }
+
+         /// <summary>
+         /// Gets the num blocks.
+         /// </summary>
+         public int NumBlocks
+         {
+            get
+            {
+               int total = 0;
+               foreach (var ecBlock in ecBlocks)
+               {
+                  total += ecBlock.Count;
+               }
+               return total;
+            }
+         }
+
+         /// <summary>
+         /// Gets the total EC codewords.
+         /// </summary>
+         public int TotalECCodewords
+         {
+            get
+            {
+               return ecCodewordsPerBlock * NumBlocks;
+            }
+         }
+
+         /// <summary>
+         /// Gets the EC blocks.
+         /// </summary>
+         /// <returns></returns>
+         public ECB[] getECBlocks()
+         {
+            return ecBlocks;
+         }
+      }
+
+      /// <summary> <p>Encapsualtes the parameters for one error-correction block in one symbol version.
+      /// This includes the number of data codewords, and the number of times a block with these
+      /// parameters is used consecutively in the QR code version's format.</p>
+      /// </summary>
+      public sealed class ECB
+      {
+         private readonly int count;
+         private readonly int dataCodewords;
+
+         internal ECB(int count, int dataCodewords)
+         {
+            this.count = count;
+            this.dataCodewords = dataCodewords;
+         }
+
+         /// <summary>
+         /// Gets the count.
+         /// </summary>
+         public int Count
+         {
+            get
+            {
+               return count;
+            }
+
+         }
+         /// <summary>
+         /// Gets the data codewords.
+         /// </summary>
+         public int DataCodewords
+         {
+            get
+            {
+               return dataCodewords;
+            }
+
+         }
+      }
+
+      /// <summary>
+      /// Returns a <see cref="System.String"/> that represents this instance.
+      /// </summary>
+      /// <returns>
+      /// A <see cref="System.String"/> that represents this instance.
+      /// </returns>
+      public override String ToString()
+      {
+         return Convert.ToString(versionNumber);
+      }
+
+      /// <summary> See ISO 18004:2006 6.5.1 Table 9</summary>
+      private static Version[] buildVersions()
+      {
+         return new Version[]{
+            new Version(1, new int[]{}, 
+               new ECBlocks(7, new ECB(1, 19)), 
+               new ECBlocks(10, new ECB(1, 16)), 
+               new ECBlocks(13, new ECB(1, 13)), 
+               new ECBlocks(17, new ECB(1, 9))), 
+            new Version(2, new int[]{6, 18}, 
+               new ECBlocks(10, new ECB(1, 34)), 
+               new ECBlocks(16, new ECB(1, 28)), 
+               new ECBlocks(22, new ECB(1, 22)), 
+               new ECBlocks(28, new ECB(1, 16))), 
+            new Version(3, new int[]{6, 22}, 
+               new ECBlocks(15, new ECB(1, 55)), 
+               new ECBlocks(26, new ECB(1, 44)), 
+               new ECBlocks(18, new ECB(2, 17)), 
+               new ECBlocks(22, new ECB(2, 13))),
+            new Version(4, new int[]{6, 26}, 
+               new ECBlocks(20, new ECB(1, 80)), 
+               new ECBlocks(18, new ECB(2, 32)), 
+               new ECBlocks(26, new ECB(2, 24)), 
+               new ECBlocks(16, new ECB(4, 9))),
+            new Version(5, new int[]{6, 30}, 
+               new ECBlocks(26, new ECB(1, 108)), 
+               new ECBlocks(24, new ECB(2, 43)), 
+               new ECBlocks(18, new ECB(2, 15), 
+                  new ECB(2, 16)), 
+               new ECBlocks(22, new ECB(2, 11), 
+                  new ECB(2, 12))),
+            new Version(6, new int[]{6, 34}, 
+               new ECBlocks(18, new ECB(2, 68)), 
+               new ECBlocks(16, new ECB(4, 27)),
+               new ECBlocks(24, new ECB(4, 19)), 
+               new ECBlocks(28, new ECB(4, 15))), 
+            new Version(7, new int[]{6, 22, 38}, 
+               new ECBlocks(20, new ECB(2, 78)), 
+               new ECBlocks(18, new ECB(4, 31)),
+               new ECBlocks(18, new ECB(2, 14), 
+                  new ECB(4, 15)),
+               new ECBlocks(26, new ECB(4, 13), 
+                  new ECB(1, 14))),
+            new Version(8, new int[]{6, 24, 42}, 
+               new ECBlocks(24, new ECB(2, 97)), 
+               new ECBlocks(22, new ECB(2, 38), 
+                  new ECB(2, 39)), 
+               new ECBlocks(22, new ECB(4, 18), 
+                  new ECB(2, 19)),
+               new ECBlocks(26, new ECB(4, 14),
+                  new ECB(2, 15))),
+            new Version(9, new int[]{6, 26, 46},
+               new ECBlocks(30, new ECB(2, 116)), 
+               new ECBlocks(22, new ECB(3, 36), 
+                  new ECB(2, 37)),
+               new ECBlocks(20, new ECB(4, 16), 
+                  new ECB(4, 17)), 
+               new ECBlocks(24, new ECB(4, 12),
+                  new ECB(4, 13))),
+            new Version(10, new int[]{6, 28, 50}, 
+               new ECBlocks(18, new ECB(2, 68), 
+                  new ECB(2, 69)), 
+               new ECBlocks(26, new ECB(4, 43),
+                  new ECB(1, 44)),
+               new ECBlocks(24, new ECB(6, 19), 
+                  new ECB(2, 20)),
+               new ECBlocks(28, new ECB(6, 15),
+                  new ECB(2, 16))), 
+            new Version(11, new int[]{6, 30, 54}, new ECBlocks(20, new ECB(4, 81)), 
+				new ECBlocks(30, new ECB(1, 50), new ECB(4, 51)), new ECBlocks(28, new ECB(4, 22), new ECB(4, 23)), new ECBlocks(24, new ECB(3, 12), new ECB(8, 13))), new Version(12, new int[]{6, 32, 58}, new ECBlocks(24, new ECB(2, 92), new ECB(2, 93)), new ECBlocks(22, new ECB(6, 36), new ECB(2, 37)), new ECBlocks(26, new ECB(4, 20), new ECB(6, 21)), new ECBlocks(28, new ECB(7, 14), new ECB(4, 15))), new Version(13, new int[]{6, 34, 62}, new ECBlocks(26, new ECB(4, 107)), new ECBlocks(22, new ECB(8, 37), new ECB(1, 38)), new ECBlocks(24, new ECB(8, 20), new ECB(4, 21)), new ECBlocks(22, new ECB(12, 11), new ECB(4, 12))), new Version(14, new int[]{6, 26, 46, 66}, new ECBlocks(30, new ECB(3, 115), new ECB(1, 116)), new ECBlocks(24, new ECB(4, 40), new ECB(5, 41)), new ECBlocks(20, new ECB(11, 16), new ECB(5, 17)), new ECBlocks(24, new ECB(11, 12), new ECB(5, 13))), new Version(15, new int[]{6, 26, 48, 70}, new ECBlocks(22, new ECB(5, 87), new ECB(1, 88)), new ECBlocks(24, new ECB(5, 41), new ECB(5, 42)), new ECBlocks(30, new ECB(5, 24), new ECB(7, 25)), new ECBlocks(24, new ECB(11, 12), new ECB(7, 13))), new Version(16, new int[]{6, 26, 50, 74}, new ECBlocks(24, new ECB(5, 98), new ECB(1, 99)), new ECBlocks(28, new ECB(7, 45), new ECB(3, 46)), new ECBlocks(24, new ECB(15, 19), new ECB(2, 20)), new ECBlocks(30, new ECB(3, 15), new ECB(13, 16))), new Version(17, new int[]{6, 30, 54, 78}, new ECBlocks(28, new ECB(1, 107), new ECB(5, 108)), new ECBlocks(28, new ECB(10, 46), new ECB(1, 47)), new ECBlocks(28, new ECB(1, 22), new ECB(15, 23)), new ECBlocks(28, new ECB(2, 14), new ECB(17, 15))), new Version(18, new int[]{6, 30, 56, 82}, new ECBlocks(30, new ECB(5, 120), new ECB(1, 121)), new ECBlocks(26, new ECB(9, 43), new ECB(4, 44)), new ECBlocks(28, new ECB(17, 22), new ECB(1, 23)), new ECBlocks(28, new ECB(2, 14), new ECB(19, 15))), new Version(19, new int[]{6, 30, 58, 86}, new ECBlocks(28, new ECB(3, 113), new ECB(4, 114)), new ECBlocks(26, new ECB(3, 44), new ECB(11, 45)), new ECBlocks(26, new ECB(17, 21), 
+				new ECB(4, 22)), new ECBlocks(26, new ECB(9, 13), new ECB(16, 14))), new Version(20, new int[]{6, 34, 62, 90}, new ECBlocks(28, new ECB(3, 107), new ECB(5, 108)), new ECBlocks(26, new ECB(3, 41), new ECB(13, 42)), new ECBlocks(30, new ECB(15, 24), new ECB(5, 25)), new ECBlocks(28, new ECB(15, 15), new ECB(10, 16))), new Version(21, new int[]{6, 28, 50, 72, 94}, new ECBlocks(28, new ECB(4, 116), new ECB(4, 117)), new ECBlocks(26, new ECB(17, 42)), new ECBlocks(28, new ECB(17, 22), new ECB(6, 23)), new ECBlocks(30, new ECB(19, 16), new ECB(6, 17))), new Version(22, new int[]{6, 26, 50, 74, 98}, new ECBlocks(28, new ECB(2, 111), new ECB(7, 112)), new ECBlocks(28, new ECB(17, 46)), new ECBlocks(30, new ECB(7, 24), new ECB(16, 25)), new ECBlocks(24, new ECB(34, 13))), new Version(23, new int[]{6, 30, 54, 74, 102}, new ECBlocks(30, new ECB(4, 121), new ECB(5, 122)), new ECBlocks(28, new ECB(4, 47), new ECB(14, 48)), new ECBlocks(30, new ECB(11, 24), new ECB(14, 25)), new ECBlocks(30, new ECB(16, 15), new ECB(14, 16))), new Version(24, new int[]{6, 28, 54, 80, 106}, new ECBlocks(30, new ECB(6, 117), new ECB(4, 118)), new ECBlocks(28, new ECB(6, 45), new ECB(14, 46)), new ECBlocks(30, new ECB(11, 24), new ECB(16, 25)), new ECBlocks(30, new ECB(30, 16), new ECB(2, 17))), new Version(25, new int[]{6, 32, 58, 84, 110}, new ECBlocks(26, new ECB(8, 106), new ECB(4, 107)), new ECBlocks(28, new ECB(8, 47), new ECB(13, 48)), new ECBlocks(30, new ECB(7, 24), new ECB(22, 25)), new ECBlocks(30, new ECB(22, 15), new ECB(13, 16))), new Version(26, new int[]{6, 30, 58, 86, 114}, new ECBlocks(28, new ECB(10, 114), new ECB(2, 115)), new ECBlocks(28, new ECB(19, 46), new ECB(4, 47)), new ECBlocks(28, new ECB(28, 22), new ECB(6, 23)), new ECBlocks(30, new ECB(33, 16), new ECB(4, 17))), new Version(27, new int[]{6, 34, 62, 90, 118}, new ECBlocks(30, new ECB(8, 122), new ECB(4, 123)), new ECBlocks(28, new ECB(22, 45), new ECB(3, 46)), new ECBlocks(30, new ECB(8, 23), new ECB(26, 24)), new ECBlocks(30, new ECB(12, 15), 
+				new ECB(28, 16))), new Version(28, new int[]{6, 26, 50, 74, 98, 122}, new ECBlocks(30, new ECB(3, 117), new ECB(10, 118)), new ECBlocks(28, new ECB(3, 45), new ECB(23, 46)), new ECBlocks(30, new ECB(4, 24), new ECB(31, 25)), new ECBlocks(30, new ECB(11, 15), new ECB(31, 16))), new Version(29, new int[]{6, 30, 54, 78, 102, 126}, new ECBlocks(30, new ECB(7, 116), new ECB(7, 117)), new ECBlocks(28, new ECB(21, 45), new ECB(7, 46)), new ECBlocks(30, new ECB(1, 23), new ECB(37, 24)), new ECBlocks(30, new ECB(19, 15), new ECB(26, 16))), new Version(30, new int[]{6, 26, 52, 78, 104, 130}, new ECBlocks(30, new ECB(5, 115), new ECB(10, 116)), new ECBlocks(28, new ECB(19, 47), new ECB(10, 48)), new ECBlocks(30, new ECB(15, 24), new ECB(25, 25)), new ECBlocks(30, new ECB(23, 15), new ECB(25, 16))), new Version(31, new int[]{6, 30, 56, 82, 108, 134}, new ECBlocks(30, new ECB(13, 115), new ECB(3, 116)), new ECBlocks(28, new ECB(2, 46), new ECB(29, 47)), new ECBlocks(30, new ECB(42, 24), new ECB(1, 25)), new ECBlocks(30, new ECB(23, 15), new ECB(28, 16))), new Version(32, new int[]{6, 34, 60, 86, 112, 138}, new ECBlocks(30, new ECB(17, 115)), new ECBlocks(28, new ECB(10, 46), new ECB(23, 47)), new ECBlocks(30, new ECB(10, 24), new ECB(35, 25)), new ECBlocks(30, new ECB(19, 15), new ECB(35, 16))), new Version(33, new int[]{6, 30, 58, 86, 114, 142}, new ECBlocks(30, new ECB(17, 115), new ECB(1, 116)), new ECBlocks(28, new ECB(14, 46), new ECB(21, 47)), new ECBlocks(30, new ECB(29, 24), new ECB(19, 25)), new ECBlocks(30, new ECB(11, 15), new ECB(46, 16))), new Version(34, new int[]{6, 34, 62, 90, 118, 146}, new ECBlocks(30, new ECB(13, 115), new ECB(6, 116)), new ECBlocks(28, new ECB(14, 46), new ECB(23, 47)), new ECBlocks(30, new ECB(44, 24), new ECB(7, 25)), new ECBlocks(30, new ECB(59, 16), new ECB(1, 17))), new Version(35, new int[]{6, 30, 54, 78, 102, 126, 150}, new ECBlocks(30, new ECB(12, 121), new ECB(7, 122)), new ECBlocks(28, new ECB(12, 47), new ECB(26, 48)), new ECBlocks(30, new ECB(39, 24), new 
+				ECB(14, 25)), new ECBlocks(30, new ECB(22, 15), new ECB(41, 16))), new Version(36, new int[]{6, 24, 50, 76, 102, 128, 154}, new ECBlocks(30, new ECB(6, 121), new ECB(14, 122)), new ECBlocks(28, new ECB(6, 47), new ECB(34, 48)), new ECBlocks(30, new ECB(46, 24), new ECB(10, 25)), new ECBlocks(30, new ECB(2, 15), new ECB(64, 16))), new Version(37, new int[]{6, 28, 54, 80, 106, 132, 158}, new ECBlocks(30, new ECB(17, 122), new ECB(4, 123)), new ECBlocks(28, new ECB(29, 46), new ECB(14, 47)), new ECBlocks(30, new ECB(49, 24), new ECB(10, 25)), new ECBlocks(30, new ECB(24, 15), new ECB(46, 16))), new Version(38, new int[]{6, 32, 58, 84, 110, 136, 162}, new ECBlocks(30, new ECB(4, 122), new ECB(18, 123)), new ECBlocks(28, new ECB(13, 46), new ECB(32, 47)), new ECBlocks(30, new ECB(48, 24), new ECB(14, 25)), new ECBlocks(30, new ECB(42, 15), new ECB(32, 16))), new Version(39, new int[]{6, 26, 54, 82, 110, 138, 166}, new ECBlocks(30, new ECB(20, 117), new ECB(4, 118)), new ECBlocks(28, new ECB(40, 47), new ECB(7, 48)), new ECBlocks(30, new ECB(43, 24), new ECB(22, 25)), new ECBlocks(30, new ECB(10, 15), new ECB(67, 16))), new Version(40, new int[]{6, 30, 58, 86, 114, 142, 170}, new ECBlocks(30, new ECB(19, 118), new ECB(6, 119)), new ECBlocks(28, new ECB(18, 47), new ECB(31, 48)), new ECBlocks(30, new ECB(34, 24), new ECB(34, 25)), new ECBlocks(30, new ECB(20, 15), new ECB(61, 16)))};
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/qrcode/detector/AlignmentPattern.cs

@@ -0,0 +1,68 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+
+namespace ZXing.QrCode.Internal
+{
+   /// <summary> <p>Encapsulates an alignment pattern, which are the smaller square patterns found in
+   /// all but the simplest QR Codes.</p>
+   /// 
+   /// </summary>
+   /// <author>  Sean Owen
+   /// </author>
+   /// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source 
+   /// </author>
+   public sealed class AlignmentPattern : ResultPoint
+   {
+      private float estimatedModuleSize;
+
+      internal AlignmentPattern(float posX, float posY, float estimatedModuleSize)
+         : base(posX, posY)
+      {
+         this.estimatedModuleSize = estimatedModuleSize;
+      }
+
+      /// <summary> <p>Determines if this alignment pattern "about equals" an alignment pattern at the stated
+      /// position and size -- meaning, it is at nearly the same center with nearly the same size.</p>
+      /// </summary>
+      internal bool aboutEquals(float moduleSize, float i, float j)
+      {
+         if (Math.Abs(i - Y) <= moduleSize && Math.Abs(j - X) <= moduleSize)
+         {
+            float moduleSizeDiff = Math.Abs(moduleSize - estimatedModuleSize);
+            return moduleSizeDiff <= 1.0f || moduleSizeDiff <= estimatedModuleSize;
+         }
+         return false;
+      }
+
+      /// <summary>
+      /// Combines this object's current estimate of a finder pattern position and module size
+      /// with a new estimate. It returns a new {@code FinderPattern} containing an average of the two.
+      /// </summary>
+      /// <param name="i">The i.</param>
+      /// <param name="j">The j.</param>
+      /// <param name="newModuleSize">New size of the module.</param>
+      /// <returns></returns>
+      internal AlignmentPattern combineEstimate(float i, float j, float newModuleSize)
+      {
+         float combinedX = (X + j) / 2.0f;
+         float combinedY = (Y + i) / 2.0f;
+         float combinedModuleSize = (estimatedModuleSize + newModuleSize) / 2.0f;
+         return new AlignmentPattern(combinedX, combinedY, combinedModuleSize);
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/qrcode/detector/AlignmentPatternFinder.cs

@@ -0,0 +1,324 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+using System.Collections.Generic;
+
+using ZXing.Common;
+
+namespace ZXing.QrCode.Internal
+{
+   /// <summary> <p>This class attempts to find alignment patterns in a QR Code. Alignment patterns look like finder
+   /// patterns but are smaller and appear at regular intervals throughout the image.</p>
+   /// 
+   /// <p>At the moment this only looks for the bottom-right alignment pattern.</p>
+   /// 
+   /// <p>This is mostly a simplified copy of {@link FinderPatternFinder}. It is copied,
+   /// pasted and stripped down here for maximum performance but does unfortunately duplicate
+   /// some code.</p>
+   /// 
+   /// <p>This class is thread-safe but not reentrant. Each thread must allocate its own object.</p>
+   /// 
+   /// </summary>
+   /// <author>  Sean Owen
+   /// </author>
+   /// <author>www.Redivivus.in (suraj.supekar@redivivus.in) - Ported from ZXING Java Source 
+   /// </author>
+   sealed class AlignmentPatternFinder
+   {
+      private readonly BitMatrix image;
+      private readonly IList<AlignmentPattern> possibleCenters;
+      private readonly int startX;
+      private readonly int startY;
+      private readonly int width;
+      private readonly int height;
+      private readonly float moduleSize;
+      private readonly int[] crossCheckStateCount;
+      private readonly ResultPointCallback resultPointCallback;
+
+      /// <summary> <p>Creates a finder that will look in a portion of the whole image.</p>
+      /// 
+      /// </summary>
+      /// <param name="image">image to search
+      /// </param>
+      /// <param name="startX">left column from which to start searching
+      /// </param>
+      /// <param name="startY">top row from which to start searching
+      /// </param>
+      /// <param name="width">width of region to search
+      /// </param>
+      /// <param name="height">height of region to search
+      /// </param>
+      /// <param name="moduleSize">estimated module size so far
+      /// </param>
+      internal AlignmentPatternFinder(BitMatrix image, int startX, int startY, int width, int height, float moduleSize, ResultPointCallback resultPointCallback)
+      {
+         this.image = image;
+         this.possibleCenters = new List<AlignmentPattern>(5);
+         this.startX = startX;
+         this.startY = startY;
+         this.width = width;
+         this.height = height;
+         this.moduleSize = moduleSize;
+         this.crossCheckStateCount = new int[3];
+         this.resultPointCallback = resultPointCallback;
+      }
+
+      /// <summary> <p>This method attempts to find the bottom-right alignment pattern in the image. It is a bit messy since
+      /// it's pretty performance-critical and so is written to be fast foremost.</p>
+      /// 
+      /// </summary>
+      /// <returns> {@link AlignmentPattern} if found
+      /// </returns>
+      internal AlignmentPattern find()
+      {
+         int startX = this.startX;
+         int height = this.height;
+         int maxJ = startX + width;
+         int middleI = startY + (height >> 1);
+         // We are looking for black/white/black modules in 1:1:1 ratio;
+         // this tracks the number of black/white/black modules seen so far
+         int[] stateCount = new int[3];
+         for (int iGen = 0; iGen < height; iGen++)
+         {
+            // Search from middle outwards
+            int i = middleI + ((iGen & 0x01) == 0 ? ((iGen + 1) >> 1) : -((iGen + 1) >> 1));
+            stateCount[0] = 0;
+            stateCount[1] = 0;
+            stateCount[2] = 0;
+            int j = startX;
+            // Burn off leading white pixels before anything else; if we start in the middle of
+            // a white run, it doesn't make sense to count its length, since we don't know if the
+            // white run continued to the left of the start point
+            while (j < maxJ && !image[j, i])
+            {
+               j++;
+            }
+            int currentState = 0;
+            while (j < maxJ)
+            {
+               if (image[j, i])
+               {
+                  // Black pixel
+                  if (currentState == 1)
+                  {
+                     // Counting black pixels
+                     stateCount[currentState]++;
+                  }
+                  else
+                  {
+                     // Counting white pixels
+                     if (currentState == 2)
+                     {
+                        // A winner?
+                        if (foundPatternCross(stateCount))
+                        {
+                           // Yes
+                           AlignmentPattern confirmed = handlePossibleCenter(stateCount, i, j);
+                           if (confirmed != null)
+                           {
+                              return confirmed;
+                           }
+                        }
+                        stateCount[0] = stateCount[2];
+                        stateCount[1] = 1;
+                        stateCount[2] = 0;
+                        currentState = 1;
+                     }
+                     else
+                     {
+                        stateCount[++currentState]++;
+                     }
+                  }
+               }
+               else
+               {
+                  // White pixel
+                  if (currentState == 1)
+                  {
+                     // Counting black pixels
+                     currentState++;
+                  }
+                  stateCount[currentState]++;
+               }
+               j++;
+            }
+            if (foundPatternCross(stateCount))
+            {
+               AlignmentPattern confirmed = handlePossibleCenter(stateCount, i, maxJ);
+               if (confirmed != null)
+               {
+                  return confirmed;
+               }
+            }
+         }
+
+         // Hmm, nothing we saw was observed and confirmed twice. If we had
+         // any guess at all, return it.
+         if (possibleCenters.Count != 0)
+         {
+            return possibleCenters[0];
+         }
+
+         return null;
+      }
+
+      /// <summary> Given a count of black/white/black pixels just seen and an end position,
+      /// figures the location of the center of this black/white/black run.
+      /// </summary>
+      private static float? centerFromEnd(int[] stateCount, int end)
+      {
+         var result = (end - stateCount[2]) - stateCount[1] / 2.0f;
+         if (Single.IsNaN(result))
+            return null;
+         return result;
+      }
+
+      /// <param name="stateCount">count of black/white/black pixels just read
+      /// </param>
+      /// <returns> true iff the proportions of the counts is close enough to the 1/1/1 ratios
+      /// used by alignment patterns to be considered a match
+      /// </returns>
+      private bool foundPatternCross(int[] stateCount)
+      {
+         float maxVariance = moduleSize / 2.0f;
+         for (int i = 0; i < 3; i++)
+         {
+            if (Math.Abs(moduleSize - stateCount[i]) >= maxVariance)
+            {
+               return false;
+            }
+         }
+         return true;
+      }
+
+      /// <summary>
+      ///   <p>After a horizontal scan finds a potential alignment pattern, this method
+      /// "cross-checks" by scanning down vertically through the center of the possible
+      /// alignment pattern to see if the same proportion is detected.</p>
+      /// </summary>
+      /// <param name="startI">row where an alignment pattern was detected</param>
+      /// <param name="centerJ">center of the section that appears to cross an alignment pattern</param>
+      /// <param name="maxCount">maximum reasonable number of modules that should be
+      /// observed in any reading state, based on the results of the horizontal scan</param>
+      /// <param name="originalStateCountTotal">The original state count total.</param>
+      /// <returns>
+      /// vertical center of alignment pattern, or null if not found
+      /// </returns>
+      private float? crossCheckVertical(int startI, int centerJ, int maxCount, int originalStateCountTotal)
+      {
+         int maxI = image.Height;
+         int[] stateCount = crossCheckStateCount;
+         stateCount[0] = 0;
+         stateCount[1] = 0;
+         stateCount[2] = 0;
+
+         // Start counting up from center
+         int i = startI;
+         while (i >= 0 && image[centerJ, i] && stateCount[1] <= maxCount)
+         {
+            stateCount[1]++;
+            i--;
+         }
+         // If already too many modules in this state or ran off the edge:
+         if (i < 0 || stateCount[1] > maxCount)
+         {
+            return null;
+         }
+         while (i >= 0 && !image[centerJ, i] && stateCount[0] <= maxCount)
+         {
+            stateCount[0]++;
+            i--;
+         }
+         if (stateCount[0] > maxCount)
+         {
+            return null;
+         }
+
+         // Now also count down from center
+         i = startI + 1;
+         while (i < maxI && image[centerJ, i] && stateCount[1] <= maxCount)
+         {
+            stateCount[1]++;
+            i++;
+         }
+         if (i == maxI || stateCount[1] > maxCount)
+         {
+            return null;
+         }
+         while (i < maxI && !image[centerJ, i] && stateCount[2] <= maxCount)
+         {
+            stateCount[2]++;
+            i++;
+         }
+         if (stateCount[2] > maxCount)
+         {
+            return null;
+         }
+
+         int stateCountTotal = stateCount[0] + stateCount[1] + stateCount[2];
+         if (5 * Math.Abs(stateCountTotal - originalStateCountTotal) >= 2 * originalStateCountTotal)
+         {
+            return null;
+         }
+
+         return foundPatternCross(stateCount) ? centerFromEnd(stateCount, i) : null;
+      }
+
+      /// <summary> <p>This is called when a horizontal scan finds a possible alignment pattern. It will
+      /// cross check with a vertical scan, and if successful, will see if this pattern had been
+      /// found on a previous horizontal scan. If so, we consider it confirmed and conclude we have
+      /// found the alignment pattern.</p>
+      /// 
+      /// </summary>
+      /// <param name="stateCount">reading state module counts from horizontal scan
+      /// </param>
+      /// <param name="i">row where alignment pattern may be found
+      /// </param>
+      /// <param name="j">end of possible alignment pattern in row
+      /// </param>
+      /// <returns> {@link AlignmentPattern} if we have found the same pattern twice, or null if not
+      /// </returns>
+      private AlignmentPattern handlePossibleCenter(int[] stateCount, int i, int j)
+      {
+         int stateCountTotal = stateCount[0] + stateCount[1] + stateCount[2];
+         float? centerJ = centerFromEnd(stateCount, j);
+         if (centerJ == null)
+            return null;
+         float? centerI = crossCheckVertical(i, (int)centerJ, 2 * stateCount[1], stateCountTotal);
+         if (centerI != null)
+         {
+            float estimatedModuleSize = (stateCount[0] + stateCount[1] + stateCount[2]) / 3.0f;
+            foreach (var center in possibleCenters)
+            {
+               // Look for about the same center and module size:
+               if (center.aboutEquals(estimatedModuleSize, centerI.Value, centerJ.Value))
+               {
+                  return center.combineEstimate(centerI.Value, centerJ.Value, estimatedModuleSize);
+               }
+            }
+            // Hadn't found this before; save it
+            var point = new AlignmentPattern(centerJ.Value, centerI.Value, estimatedModuleSize);
+            possibleCenters.Add(point);
+            if (resultPointCallback != null)
+            {
+               resultPointCallback(point);
+            }
+         }
+         return null;
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/qrcode/detector/Detector.cs

@@ -0,0 +1,429 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+using System.Collections.Generic;
+
+using ZXing.Common;
+using ZXing.Common.Detector;
+
+namespace ZXing.QrCode.Internal
+{
+   /// <summary>
+   /// <p>Encapsulates logic that can detect a QR Code in an image, even if the QR Code
+   /// is rotated or skewed, or partially obscured.</p>
+   /// </summary>
+   /// <author>Sean Owen</author>
+   public class Detector
+   {
+      private readonly BitMatrix image;
+      private ResultPointCallback resultPointCallback;
+
+      /// <summary>
+      /// Initializes a new instance of the <see cref="Detector"/> class.
+      /// </summary>
+      /// <param name="image">The image.</param>
+      public Detector(BitMatrix image)
+      {
+         this.image = image;
+      }
+
+      /// <summary>
+      /// Gets the image.
+      /// </summary>
+      virtual protected internal BitMatrix Image
+      {
+         get
+         {
+            return image;
+         }
+      }
+
+      /// <summary>
+      /// Gets the result point callback.
+      /// </summary>
+      virtual protected internal ResultPointCallback ResultPointCallback
+      {
+         get
+         {
+            return resultPointCallback;
+         }
+      }
+
+      /// <summary>
+      ///   <p>Detects a QR Code in an image, simply.</p>
+      /// </summary>
+      /// <returns>
+      ///   <see cref="DetectorResult"/> encapsulating results of detecting a QR Code
+      /// </returns>
+      public virtual DetectorResult detect()
+      {
+         return detect(null);
+      }
+
+      /// <summary>
+      ///   <p>Detects a QR Code in an image, simply.</p>
+      /// </summary>
+      /// <param name="hints">optional hints to detector</param>
+      /// <returns>
+      ///   <see cref="DetectorResult"/> encapsulating results of detecting a QR Code
+      /// </returns>
+      public virtual DetectorResult detect(IDictionary<DecodeHintType, object> hints)
+      {
+         resultPointCallback = hints == null || !hints.ContainsKey(DecodeHintType.NEED_RESULT_POINT_CALLBACK) ? null : (ResultPointCallback)hints[DecodeHintType.NEED_RESULT_POINT_CALLBACK];
+
+         FinderPatternFinder finder = new FinderPatternFinder(image, resultPointCallback);
+         FinderPatternInfo info = finder.find(hints);
+         if (info == null)
+            return null;
+
+         return processFinderPatternInfo(info);
+      }
+
+      /// <summary>
+      /// Processes the finder pattern info.
+      /// </summary>
+      /// <param name="info">The info.</param>
+      /// <returns></returns>
+      protected internal virtual DetectorResult processFinderPatternInfo(FinderPatternInfo info)
+      {
+         FinderPattern topLeft = info.TopLeft;
+         FinderPattern topRight = info.TopRight;
+         FinderPattern bottomLeft = info.BottomLeft;
+
+         float moduleSize = calculateModuleSize(topLeft, topRight, bottomLeft);
+         if (moduleSize < 1.0f)
+         {
+            return null;
+         }
+         int dimension;
+         if (!computeDimension(topLeft, topRight, bottomLeft, moduleSize, out dimension))
+            return null;
+         Internal.Version provisionalVersion = Internal.Version.getProvisionalVersionForDimension(dimension);
+         if (provisionalVersion == null)
+            return null;
+         int modulesBetweenFPCenters = provisionalVersion.DimensionForVersion - 7;
+
+         AlignmentPattern alignmentPattern = null;
+         // Anything above version 1 has an alignment pattern
+         if (provisionalVersion.AlignmentPatternCenters.Length > 0)
+         {
+
+            // Guess where a "bottom right" finder pattern would have been
+            float bottomRightX = topRight.X - topLeft.X + bottomLeft.X;
+            float bottomRightY = topRight.Y - topLeft.Y + bottomLeft.Y;
+
+            // Estimate that alignment pattern is closer by 3 modules
+            // from "bottom right" to known top left location
+            //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+            float correctionToTopLeft = 1.0f - 3.0f / (float)modulesBetweenFPCenters;
+            //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+            int estAlignmentX = (int)(topLeft.X + correctionToTopLeft * (bottomRightX - topLeft.X));
+            //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+            int estAlignmentY = (int)(topLeft.Y + correctionToTopLeft * (bottomRightY - topLeft.Y));
+
+            // Kind of arbitrary -- expand search radius before giving up
+            for (int i = 4; i <= 16; i <<= 1)
+            {
+               alignmentPattern = findAlignmentInRegion(moduleSize, estAlignmentX, estAlignmentY, (float)i);
+               if (alignmentPattern == null)
+                  continue;
+               break;
+            }
+            // If we didn't find alignment pattern... well try anyway without it
+         }
+
+         PerspectiveTransform transform = createTransform(topLeft, topRight, bottomLeft, alignmentPattern, dimension);
+
+         BitMatrix bits = sampleGrid(image, transform, dimension);
+         if (bits == null)
+            return null;
+
+         ResultPoint[] points;
+         if (alignmentPattern == null)
+         {
+            points = new ResultPoint[] { bottomLeft, topLeft, topRight };
+         }
+         else
+         {
+            points = new ResultPoint[] { bottomLeft, topLeft, topRight, alignmentPattern };
+         }
+         return new DetectorResult(bits, points);
+      }
+
+      private static PerspectiveTransform createTransform(ResultPoint topLeft, ResultPoint topRight, ResultPoint bottomLeft, ResultPoint alignmentPattern, int dimension)
+      {
+         //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+         float dimMinusThree = (float)dimension - 3.5f;
+         float bottomRightX;
+         float bottomRightY;
+         float sourceBottomRightX;
+         float sourceBottomRightY;
+         if (alignmentPattern != null)
+         {
+            bottomRightX = alignmentPattern.X;
+            bottomRightY = alignmentPattern.Y;
+            sourceBottomRightX = sourceBottomRightY = dimMinusThree - 3.0f;
+         }
+         else
+         {
+            // Don't have an alignment pattern, just make up the bottom-right point
+            bottomRightX = (topRight.X - topLeft.X) + bottomLeft.X;
+            bottomRightY = (topRight.Y - topLeft.Y) + bottomLeft.Y;
+            sourceBottomRightX = sourceBottomRightY = dimMinusThree;
+         }
+
+         return PerspectiveTransform.quadrilateralToQuadrilateral(
+            3.5f,
+            3.5f,
+            dimMinusThree,
+            3.5f,
+            sourceBottomRightX,
+            sourceBottomRightY,
+            3.5f,
+            dimMinusThree,
+            topLeft.X,
+            topLeft.Y,
+            topRight.X,
+            topRight.Y,
+            bottomRightX,
+            bottomRightY,
+            bottomLeft.X,
+            bottomLeft.Y);
+      }
+
+      private static BitMatrix sampleGrid(BitMatrix image, PerspectiveTransform transform, int dimension)
+      {
+         GridSampler sampler = GridSampler.Instance;
+         return sampler.sampleGrid(image, dimension, dimension, transform);
+      }
+
+      /// <summary> <p>Computes the dimension (number of modules on a size) of the QR Code based on the position
+      /// of the finder patterns and estimated module size.</p>
+      /// </summary>
+      private static bool computeDimension(ResultPoint topLeft, ResultPoint topRight, ResultPoint bottomLeft, float moduleSize, out int dimension)
+      {
+         int tltrCentersDimension = MathUtils.round(ResultPoint.distance(topLeft, topRight) / moduleSize);
+         int tlblCentersDimension = MathUtils.round(ResultPoint.distance(topLeft, bottomLeft) / moduleSize);
+         dimension = ((tltrCentersDimension + tlblCentersDimension) >> 1) + 7;
+         switch (dimension & 0x03)
+         {
+            // mod 4
+            case 0:
+               dimension++;
+               break;
+            // 1? do nothing
+            case 2:
+               dimension--;
+               break;
+            case 3:
+               return true;
+         }
+         return true;
+      }
+
+      /// <summary> <p>Computes an average estimated module size based on estimated derived from the positions
+      /// of the three finder patterns.</p>
+      /// </summary>
+      protected internal virtual float calculateModuleSize(ResultPoint topLeft, ResultPoint topRight, ResultPoint bottomLeft)
+      {
+         // Take the average
+         return (calculateModuleSizeOneWay(topLeft, topRight) + calculateModuleSizeOneWay(topLeft, bottomLeft)) / 2.0f;
+      }
+
+      /// <summary> <p>Estimates module size based on two finder patterns -- it uses
+      /// {@link #sizeOfBlackWhiteBlackRunBothWays(int, int, int, int)} to figure the
+      /// width of each, measuring along the axis between their centers.</p>
+      /// </summary>
+      private float calculateModuleSizeOneWay(ResultPoint pattern, ResultPoint otherPattern)
+      {
+         //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+         float moduleSizeEst1 = sizeOfBlackWhiteBlackRunBothWays((int)pattern.X, (int)pattern.Y, (int)otherPattern.X, (int)otherPattern.Y);
+         //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+         float moduleSizeEst2 = sizeOfBlackWhiteBlackRunBothWays((int)otherPattern.X, (int)otherPattern.Y, (int)pattern.X, (int)pattern.Y);
+         if (Single.IsNaN(moduleSizeEst1))
+         {
+            return moduleSizeEst2 / 7.0f;
+         }
+         if (Single.IsNaN(moduleSizeEst2))
+         {
+            return moduleSizeEst1 / 7.0f;
+         }
+         // Average them, and divide by 7 since we've counted the width of 3 black modules,
+         // and 1 white and 1 black module on either side. Ergo, divide sum by 14.
+         return (moduleSizeEst1 + moduleSizeEst2) / 14.0f;
+      }
+
+      /// <summary> See {@link #sizeOfBlackWhiteBlackRun(int, int, int, int)}; computes the total width of
+      /// a finder pattern by looking for a black-white-black run from the center in the direction
+      /// of another point (another finder pattern center), and in the opposite direction too.
+      /// </summary>
+      private float sizeOfBlackWhiteBlackRunBothWays(int fromX, int fromY, int toX, int toY)
+      {
+
+         float result = sizeOfBlackWhiteBlackRun(fromX, fromY, toX, toY);
+
+         // Now count other way -- don't run off image though of course
+         float scale = 1.0f;
+         int otherToX = fromX - (toX - fromX);
+         if (otherToX < 0)
+         {
+            //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+            scale = (float)fromX / (float)(fromX - otherToX);
+            otherToX = 0;
+         }
+         else if (otherToX >= image.Width)
+         {
+            //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+            scale = (float)(image.Width - 1 - fromX) / (float)(otherToX - fromX);
+            otherToX = image.Width - 1;
+         }
+         //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+         int otherToY = (int)(fromY - (toY - fromY) * scale);
+
+         scale = 1.0f;
+         if (otherToY < 0)
+         {
+            //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+            scale = (float)fromY / (float)(fromY - otherToY);
+            otherToY = 0;
+         }
+         else if (otherToY >= image.Height)
+         {
+            //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+            scale = (float)(image.Height - 1 - fromY) / (float)(otherToY - fromY);
+            otherToY = image.Height - 1;
+         }
+         //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+         otherToX = (int)(fromX + (otherToX - fromX) * scale);
+
+         result += sizeOfBlackWhiteBlackRun(fromX, fromY, otherToX, otherToY);
+         return result - 1.0f; // -1 because we counted the middle pixel twice
+      }
+
+      /// <summary> <p>This method traces a line from a point in the image, in the direction towards another point.
+      /// It begins in a black region, and keeps going until it finds white, then black, then white again.
+      /// It reports the distance from the start to this point.</p>
+      /// 
+      /// <p>This is used when figuring out how wide a finder pattern is, when the finder pattern
+      /// may be skewed or rotated.</p>
+      /// </summary>
+      private float sizeOfBlackWhiteBlackRun(int fromX, int fromY, int toX, int toY)
+      {
+         // Mild variant of Bresenham's algorithm;
+         // see http://en.wikipedia.org/wiki/Bresenham's_line_algorithm
+         bool steep = Math.Abs(toY - fromY) > Math.Abs(toX - fromX);
+         if (steep)
+         {
+            int temp = fromX;
+            fromX = fromY;
+            fromY = temp;
+            temp = toX;
+            toX = toY;
+            toY = temp;
+         }
+
+         int dx = Math.Abs(toX - fromX);
+         int dy = Math.Abs(toY - fromY);
+         int error = -dx >> 1;
+         int xstep = fromX < toX ? 1 : -1;
+         int ystep = fromY < toY ? 1 : -1;
+
+         // In black pixels, looking for white, first or second time.
+         int state = 0;
+         // Loop up until x == toX, but not beyond
+         int xLimit = toX + xstep;
+         for (int x = fromX, y = fromY; x != xLimit; x += xstep)
+         {
+            int realX = steep ? y : x;
+            int realY = steep ? x : y;
+
+            // Does current pixel mean we have moved white to black or vice versa?
+            // Scanning black in state 0,2 and white in state 1, so if we find the wrong
+            // color, advance to next state or end if we are in state 2 already
+            if ((state == 1) == image[realX, realY])
+            {
+               if (state == 2)
+               {
+                  return MathUtils.distance(x, y, fromX, fromY);
+               }
+               state++;
+            }
+            error += dy;
+            if (error > 0)
+            {
+               if (y == toY)
+               {
+
+
+                  break;
+               }
+               y += ystep;
+               error -= dx;
+            }
+         }
+         // Found black-white-black; give the benefit of the doubt that the next pixel outside the image
+         // is "white" so this last point at (toX+xStep,toY) is the right ending. This is really a
+         // small approximation; (toX+xStep,toY+yStep) might be really correct. Ignore this.
+         if (state == 2)
+         {
+            return MathUtils.distance(toX + xstep, toY, fromX, fromY);
+         }
+         // else we didn't find even black-white-black; no estimate is really possible
+         return Single.NaN;
+
+      }
+
+      /// <summary>
+      ///   <p>Attempts to locate an alignment pattern in a limited region of the image, which is
+      /// guessed to contain it. This method uses {@link AlignmentPattern}.</p>
+      /// </summary>
+      /// <param name="overallEstModuleSize">estimated module size so far</param>
+      /// <param name="estAlignmentX">x coordinate of center of area probably containing alignment pattern</param>
+      /// <param name="estAlignmentY">y coordinate of above</param>
+      /// <param name="allowanceFactor">number of pixels in all directions to search from the center</param>
+      /// <returns>
+      ///   <see cref="AlignmentPattern"/> if found, or null otherwise
+      /// </returns>
+      protected AlignmentPattern findAlignmentInRegion(float overallEstModuleSize, int estAlignmentX, int estAlignmentY, float allowanceFactor)
+      {
+         // Look for an alignment pattern (3 modules in size) around where it
+         // should be
+         //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+         int allowance = (int)(allowanceFactor * overallEstModuleSize);
+         int alignmentAreaLeftX = Math.Max(0, estAlignmentX - allowance);
+         int alignmentAreaRightX = Math.Min(image.Width - 1, estAlignmentX + allowance);
+         if (alignmentAreaRightX - alignmentAreaLeftX < overallEstModuleSize * 3)
+         {
+            return null;
+         }
+
+         int alignmentAreaTopY = Math.Max(0, estAlignmentY - allowance);
+         int alignmentAreaBottomY = Math.Min(image.Height - 1, estAlignmentY + allowance);
+
+         var alignmentFinder = new AlignmentPatternFinder(
+            image,
+            alignmentAreaLeftX,
+            alignmentAreaTopY,
+            alignmentAreaRightX - alignmentAreaLeftX,
+            alignmentAreaBottomY - alignmentAreaTopY,
+            overallEstModuleSize,
+            resultPointCallback);
+
+         return alignmentFinder.find();
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/qrcode/detector/FinderPattern.cs

@@ -0,0 +1,107 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+
+namespace ZXing.QrCode.Internal
+{
+   /// <summary>
+   /// <p>Encapsulates a finder pattern, which are the three square patterns found in
+   /// the corners of QR Codes. It also encapsulates a count of similar finder patterns,
+   /// as a convenience to the finder's bookkeeping.</p>
+   /// </summary>
+   /// <author>Sean Owen</author>
+   public sealed class FinderPattern : ResultPoint
+   {
+      private readonly float estimatedModuleSize;
+      private int count;
+
+      internal FinderPattern(float posX, float posY, float estimatedModuleSize)
+         : this(posX, posY, estimatedModuleSize, 1)
+      {
+         this.estimatedModuleSize = estimatedModuleSize;
+         this.count = 1;
+      }
+
+      internal FinderPattern(float posX, float posY, float estimatedModuleSize, int count)
+         : base(posX, posY)
+      {
+         this.estimatedModuleSize = estimatedModuleSize;
+         this.count = count;
+      }
+
+      /// <summary>
+      /// Gets the size of the estimated module.
+      /// </summary>
+      /// <value>
+      /// The size of the estimated module.
+      /// </value>
+      public float EstimatedModuleSize
+      {
+         get
+         {
+            return estimatedModuleSize;
+         }
+      }
+
+      internal int Count
+      {
+         get
+         {
+            return count;
+         }
+      }
+
+      /*
+      internal void incrementCount()
+      {
+         this.count++;
+      }
+      */
+
+      /// <summary> <p>Determines if this finder pattern "about equals" a finder pattern at the stated
+      /// position and size -- meaning, it is at nearly the same center with nearly the same size.</p>
+      /// </summary>
+      internal bool aboutEquals(float moduleSize, float i, float j)
+      {
+         if (Math.Abs(i - Y) <= moduleSize && Math.Abs(j - X) <= moduleSize)
+         {
+            float moduleSizeDiff = Math.Abs(moduleSize - estimatedModuleSize);
+            return moduleSizeDiff <= 1.0f || moduleSizeDiff <= estimatedModuleSize;
+
+         }
+         return false;
+      }
+
+      /// <summary>
+      /// Combines this object's current estimate of a finder pattern position and module size
+      /// with a new estimate. It returns a new {@code FinderPattern} containing a weighted average
+      /// based on count.
+      /// </summary>
+      /// <param name="i">The i.</param>
+      /// <param name="j">The j.</param>
+      /// <param name="newModuleSize">New size of the module.</param>
+      /// <returns></returns>
+      internal FinderPattern combineEstimate(float i, float j, float newModuleSize)
+      {
+         int combinedCount = count + 1;
+         float combinedX = (count * X + j) / combinedCount;
+         float combinedY = (count * Y + i) / combinedCount;
+         float combinedModuleSize = (count * estimatedModuleSize + newModuleSize) / combinedCount;
+         return new FinderPattern(combinedX, combinedY, combinedModuleSize, combinedCount);
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/qrcode/detector/FinderPatternFinder.cs

@@ -0,0 +1,808 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+using System.Collections.Generic;
+
+using ZXing.Common;
+
+namespace ZXing.QrCode.Internal
+{
+   /// <summary>
+   /// <p>This class attempts to find finder patterns in a QR Code. Finder patterns are the square
+   /// markers at three corners of a QR Code.</p>
+   /// 
+   /// <p>This class is thread-safe but not reentrant. Each thread must allocate its own object.
+   /// </summary>
+   /// <author>Sean Owen</author>
+   public class FinderPatternFinder
+   {
+      private const int CENTER_QUORUM = 2;
+      /// <summary>
+      /// 1 pixel/module times 3 modules/center
+      /// </summary>
+      protected internal const int MIN_SKIP = 3; 
+      /// <summary>
+      /// support up to version 10 for mobile clients
+      /// </summary>
+      protected internal const int MAX_MODULES = 57;
+      private const int INTEGER_MATH_SHIFT = 8;
+
+      private readonly BitMatrix image;
+      private List<FinderPattern> possibleCenters;
+      private bool hasSkipped;
+      private readonly int[] crossCheckStateCount;
+      private readonly ResultPointCallback resultPointCallback;
+
+      /// <summary>
+      /// <p>Creates a finder that will search the image for three finder patterns.</p>
+      /// </summary>
+      /// <param name="image">image to search</param>
+      public FinderPatternFinder(BitMatrix image)
+         : this(image, null)
+      {
+      }
+
+      /// <summary>
+      /// Initializes a new instance of the <see cref="FinderPatternFinder"/> class.
+      /// </summary>
+      /// <param name="image">The image.</param>
+      /// <param name="resultPointCallback">The result point callback.</param>
+      public FinderPatternFinder(BitMatrix image, ResultPointCallback resultPointCallback)
+      {
+         this.image = image;
+         this.possibleCenters = new List<FinderPattern>();
+         this.crossCheckStateCount = new int[5];
+         this.resultPointCallback = resultPointCallback;
+      }
+
+      /// <summary>
+      /// Gets the image.
+      /// </summary>
+      virtual protected internal BitMatrix Image
+      {
+         get
+         {
+            return image;
+         }
+      }
+
+      /// <summary>
+      /// Gets the possible centers.
+      /// </summary>
+      virtual protected internal List<FinderPattern> PossibleCenters
+      {
+         get
+         {
+            return possibleCenters;
+         }
+      }
+
+      internal virtual FinderPatternInfo find(IDictionary<DecodeHintType, object> hints)
+      {
+         bool tryHarder = hints != null && hints.ContainsKey(DecodeHintType.TRY_HARDER);
+         bool pureBarcode = hints != null && hints.ContainsKey(DecodeHintType.PURE_BARCODE);
+         int maxI = image.Height;
+         int maxJ = image.Width;
+         // We are looking for black/white/black/white/black modules in
+         // 1:1:3:1:1 ratio; this tracks the number of such modules seen so far
+
+         // Let's assume that the maximum version QR Code we support takes up 1/4 the height of the
+         // image, and then account for the center being 3 modules in size. This gives the smallest
+         // number of pixels the center could be, so skip this often. When trying harder, look for all
+         // QR versions regardless of how dense they are.
+         int iSkip = (3 * maxI) / (4 * MAX_MODULES);
+         if (iSkip < MIN_SKIP || tryHarder)
+         {
+            iSkip = MIN_SKIP;
+         }
+
+         bool done = false;
+         int[] stateCount = new int[5];
+         for (int i = iSkip - 1; i < maxI && !done; i += iSkip)
+         {
+            // Get a row of black/white values
+            stateCount[0] = 0;
+            stateCount[1] = 0;
+            stateCount[2] = 0;
+            stateCount[3] = 0;
+            stateCount[4] = 0;
+            int currentState = 0;
+            for (int j = 0; j < maxJ; j++)
+            {
+               if (image[j, i])
+               {
+                  // Black pixel
+                  if ((currentState & 1) == 1)
+                  {
+                     // Counting white pixels
+                     currentState++;
+                  }
+                  stateCount[currentState]++;
+               }
+               else
+               {
+                  // White pixel
+                  if ((currentState & 1) == 0)
+                  {
+                     // Counting black pixels
+                     if (currentState == 4)
+                     {
+                        // A winner?
+                        if (foundPatternCross(stateCount))
+                        {
+                           // Yes
+                           bool confirmed = handlePossibleCenter(stateCount, i, j, pureBarcode);
+                           if (confirmed)
+                           {
+                              // Start examining every other line. Checking each line turned out to be too
+                              // expensive and didn't improve performance.
+                              iSkip = 2;
+                              if (hasSkipped)
+                              {
+                                 done = haveMultiplyConfirmedCenters();
+                              }
+                              else
+                              {
+                                 int rowSkip = findRowSkip();
+                                 if (rowSkip > stateCount[2])
+                                 {
+                                    // Skip rows between row of lower confirmed center
+                                    // and top of presumed third confirmed center
+                                    // but back up a bit to get a full chance of detecting
+                                    // it, entire width of center of finder pattern
+
+                                    // Skip by rowSkip, but back off by stateCount[2] (size of last center
+                                    // of pattern we saw) to be conservative, and also back off by iSkip which
+                                    // is about to be re-added
+                                    i += rowSkip - stateCount[2] - iSkip;
+                                    j = maxJ - 1;
+                                 }
+                              }
+                           }
+                           else
+                           {
+                              stateCount[0] = stateCount[2];
+                              stateCount[1] = stateCount[3];
+                              stateCount[2] = stateCount[4];
+                              stateCount[3] = 1;
+                              stateCount[4] = 0;
+                              currentState = 3;
+                              continue;
+                           }
+                           // Clear state to start looking again
+                           currentState = 0;
+                           stateCount[0] = 0;
+                           stateCount[1] = 0;
+                           stateCount[2] = 0;
+                           stateCount[3] = 0;
+                           stateCount[4] = 0;
+                        }
+                        else
+                        {
+                           // No, shift counts back by two
+                           stateCount[0] = stateCount[2];
+                           stateCount[1] = stateCount[3];
+                           stateCount[2] = stateCount[4];
+                           stateCount[3] = 1;
+                           stateCount[4] = 0;
+                           currentState = 3;
+                        }
+                     }
+                     else
+                     {
+                        stateCount[++currentState]++;
+                     }
+                  }
+                  else
+                  {
+                     // Counting white pixels
+                     stateCount[currentState]++;
+                  }
+               }
+            }
+            if (foundPatternCross(stateCount))
+            {
+               bool confirmed = handlePossibleCenter(stateCount, i, maxJ, pureBarcode);
+               if (confirmed)
+               {
+                  iSkip = stateCount[0];
+                  if (hasSkipped)
+                  {
+                     // Found a third one
+                     done = haveMultiplyConfirmedCenters();
+                  }
+               }
+            }
+         }
+
+         FinderPattern[] patternInfo = selectBestPatterns();
+         if (patternInfo == null)
+            return null;
+
+         ResultPoint.orderBestPatterns(patternInfo);
+
+         return new FinderPatternInfo(patternInfo);
+      }
+
+      /// <summary> Given a count of black/white/black/white/black pixels just seen and an end position,
+      /// figures the location of the center of this run.
+      /// </summary>
+      private static float? centerFromEnd(int[] stateCount, int end)
+      {
+         var result = (end - stateCount[4] - stateCount[3]) - stateCount[2] / 2.0f;
+         if (Single.IsNaN(result))
+            return null;
+         return result;
+      }
+
+      /// <param name="stateCount">count of black/white/black/white/black pixels just read
+      /// </param>
+      /// <returns> true iff the proportions of the counts is close enough to the 1/1/3/1/1 ratios
+      /// used by finder patterns to be considered a match
+      /// </returns>
+      protected internal static bool foundPatternCross(int[] stateCount)
+      {
+         int totalModuleSize = 0;
+         for (int i = 0; i < 5; i++)
+         {
+            int count = stateCount[i];
+            if (count == 0)
+            {
+               return false;
+            }
+            totalModuleSize += count;
+         }
+         if (totalModuleSize < 7)
+         {
+            return false;
+         }
+         int moduleSize = (totalModuleSize << INTEGER_MATH_SHIFT) / 7;
+         int maxVariance = moduleSize / 2;
+         // Allow less than 50% variance from 1-1-3-1-1 proportions
+         return Math.Abs(moduleSize - (stateCount[0] << INTEGER_MATH_SHIFT)) < maxVariance &&
+             Math.Abs(moduleSize - (stateCount[1] << INTEGER_MATH_SHIFT)) < maxVariance &&
+             Math.Abs(3 * moduleSize - (stateCount[2] << INTEGER_MATH_SHIFT)) < 3 * maxVariance &&
+             Math.Abs(moduleSize - (stateCount[3] << INTEGER_MATH_SHIFT)) < maxVariance &&
+             Math.Abs(moduleSize - (stateCount[4] << INTEGER_MATH_SHIFT)) < maxVariance;
+      }
+
+      private int[] CrossCheckStateCount
+      {
+         get
+         {
+            crossCheckStateCount[0] = 0;
+            crossCheckStateCount[1] = 0;
+            crossCheckStateCount[2] = 0;
+            crossCheckStateCount[3] = 0;
+            crossCheckStateCount[4] = 0;
+            return crossCheckStateCount;
+         }
+      }
+
+      /// <summary>
+      /// After a vertical and horizontal scan finds a potential finder pattern, this method
+      /// "cross-cross-cross-checks" by scanning down diagonally through the center of the possible
+      /// finder pattern to see if the same proportion is detected.
+      /// </summary>
+      /// <param name="startI">row where a finder pattern was detected</param>
+      /// <param name="centerJ">center of the section that appears to cross a finder pattern</param>
+      /// <param name="maxCount">maximum reasonable number of modules that should be observed in any reading state, based on the results of the horizontal scan</param>
+      /// <param name="originalStateCountTotal">The original state count total.</param>
+      /// <returns>true if proportions are withing expected limits</returns>
+      private bool crossCheckDiagonal(int startI, int centerJ, int maxCount, int originalStateCountTotal)
+      {
+         int maxI = image.Height;
+         int maxJ = image.Width;
+         int[] stateCount = CrossCheckStateCount;
+
+         // Start counting up, left from center finding black center mass
+         int i = 0;
+         while (startI - i >= 0 && image[centerJ - i, startI - i])
+         {
+            stateCount[2]++;
+            i++;
+         }
+
+         if ((startI - i < 0) || (centerJ - i < 0))
+         {
+            return false;
+         }
+
+         // Continue up, left finding white space
+         while ((startI - i >= 0) && (centerJ - i >= 0) && !image[centerJ - i, startI - i] && stateCount[1] <= maxCount)
+         {
+            stateCount[1]++;
+            i++;
+         }
+
+         // If already too many modules in this state or ran off the edge:
+         if ((startI - i < 0) || (centerJ - i < 0) || stateCount[1] > maxCount)
+         {
+            return false;
+         }
+
+         // Continue up, left finding black border
+         while ((startI - i >= 0) && (centerJ - i >= 0) && image[centerJ - i, startI - i] && stateCount[0] <= maxCount)
+         {
+            stateCount[0]++;
+            i++;
+         }
+         if (stateCount[0] > maxCount)
+         {
+            return false;
+         }
+
+         // Now also count down, right from center
+         i = 1;
+         while ((startI + i < maxI) && (centerJ + i < maxJ) && image[centerJ + i, startI + i])
+         {
+            stateCount[2]++;
+            i++;
+         }
+
+         // Ran off the edge?
+         if ((startI + i >= maxI) || (centerJ + i >= maxJ))
+         {
+            return false;
+         }
+
+         while ((startI + i < maxI) && (centerJ + i < maxJ) && !image[centerJ + i, startI + i] && stateCount[3] < maxCount)
+         {
+            stateCount[3]++;
+            i++;
+         }
+
+         if ((startI + i >= maxI) || (centerJ + i >= maxJ) || stateCount[3] >= maxCount)
+         {
+            return false;
+         }
+
+         while ((startI + i < maxI) && (centerJ + i < maxJ) && image[centerJ + i, startI + i] && stateCount[4] < maxCount)
+         {
+            stateCount[4]++;
+            i++;
+         }
+
+         if (stateCount[4] >= maxCount)
+         {
+            return false;
+         }
+
+         // If we found a finder-pattern-like section, but its size is more than 100% different than
+         // the original, assume it's a false positive
+         int stateCountTotal = stateCount[0] + stateCount[1] + stateCount[2] + stateCount[3] + stateCount[4];
+         return Math.Abs(stateCountTotal - originalStateCountTotal) < 2*originalStateCountTotal &&
+                foundPatternCross(stateCount);
+      }
+
+      /// <summary>
+      ///   <p>After a horizontal scan finds a potential finder pattern, this method
+      /// "cross-checks" by scanning down vertically through the center of the possible
+      /// finder pattern to see if the same proportion is detected.</p>
+      /// </summary>
+      /// <param name="startI">row where a finder pattern was detected</param>
+      /// <param name="centerJ">center of the section that appears to cross a finder pattern</param>
+      /// <param name="maxCount">maximum reasonable number of modules that should be
+      /// observed in any reading state, based on the results of the horizontal scan</param>
+      /// <param name="originalStateCountTotal">The original state count total.</param>
+      /// <returns>
+      /// vertical center of finder pattern, or null if not found
+      /// </returns>
+      private float? crossCheckVertical(int startI, int centerJ, int maxCount, int originalStateCountTotal)
+      {
+         int maxI = image.Height;
+         int[] stateCount = CrossCheckStateCount;
+
+         // Start counting up from center
+         int i = startI;
+         while (i >= 0 && image[centerJ, i])
+         {
+            stateCount[2]++;
+            i--;
+         }
+         if (i < 0)
+         {
+            return null;
+         }
+         while (i >= 0 && !image[centerJ, i] && stateCount[1] <= maxCount)
+         {
+            stateCount[1]++;
+            i--;
+         }
+         // If already too many modules in this state or ran off the edge:
+         if (i < 0 || stateCount[1] > maxCount)
+         {
+            return null;
+         }
+         while (i >= 0 && image[centerJ, i] && stateCount[0] <= maxCount)
+         {
+            stateCount[0]++;
+            i--;
+         }
+         if (stateCount[0] > maxCount)
+         {
+            return null;
+         }
+
+         // Now also count down from center
+         i = startI + 1;
+         while (i < maxI && image[centerJ, i])
+         {
+            stateCount[2]++;
+            i++;
+         }
+         if (i == maxI)
+         {
+            return null;
+         }
+         while (i < maxI && !image[centerJ, i] && stateCount[3] < maxCount)
+         {
+            stateCount[3]++;
+            i++;
+         }
+         if (i == maxI || stateCount[3] >= maxCount)
+         {
+            return null;
+         }
+         while (i < maxI && image[centerJ, i] && stateCount[4] < maxCount)
+         {
+            stateCount[4]++;
+            i++;
+         }
+         if (stateCount[4] >= maxCount)
+         {
+            return null;
+         }
+
+         // If we found a finder-pattern-like section, but its size is more than 40% different than
+         // the original, assume it's a false positive
+         int stateCountTotal = stateCount[0] + stateCount[1] + stateCount[2] + stateCount[3] + stateCount[4];
+         if (5 * Math.Abs(stateCountTotal - originalStateCountTotal) >= 2 * originalStateCountTotal)
+         {
+            return null;
+         }
+
+         return foundPatternCross(stateCount) ? centerFromEnd(stateCount, i) : null;
+      }
+
+      /// <summary> <p>Like {@link #crossCheckVertical(int, int, int, int)}, and in fact is basically identical,
+      /// except it reads horizontally instead of vertically. This is used to cross-cross
+      /// check a vertical cross check and locate the real center of the alignment pattern.</p>
+      /// </summary>
+      private float? crossCheckHorizontal(int startJ, int centerI, int maxCount, int originalStateCountTotal)
+      {
+         int maxJ = image.Width;
+         int[] stateCount = CrossCheckStateCount;
+
+         int j = startJ;
+         while (j >= 0 && image[j, centerI])
+         {
+            stateCount[2]++;
+            j--;
+         }
+         if (j < 0)
+         {
+            return null;
+         }
+         while (j >= 0 && !image[j, centerI] && stateCount[1] <= maxCount)
+         {
+            stateCount[1]++;
+            j--;
+         }
+         if (j < 0 || stateCount[1] > maxCount)
+         {
+            return null;
+         }
+         while (j >= 0 && image[j, centerI] && stateCount[0] <= maxCount)
+         {
+            stateCount[0]++;
+            j--;
+         }
+         if (stateCount[0] > maxCount)
+         {
+            return null;
+         }
+
+         j = startJ + 1;
+         while (j < maxJ && image[j, centerI])
+         {
+            stateCount[2]++;
+            j++;
+         }
+         if (j == maxJ)
+         {
+            return null;
+         }
+         while (j < maxJ && !image[j, centerI] && stateCount[3] < maxCount)
+         {
+            stateCount[3]++;
+            j++;
+         }
+         if (j == maxJ || stateCount[3] >= maxCount)
+         {
+            return null;
+         }
+         while (j < maxJ && image[j, centerI] && stateCount[4] < maxCount)
+         {
+            stateCount[4]++;
+            j++;
+         }
+         if (stateCount[4] >= maxCount)
+         {
+            return null;
+         }
+
+         // If we found a finder-pattern-like section, but its size is significantly different than
+         // the original, assume it's a false positive
+         int stateCountTotal = stateCount[0] + stateCount[1] + stateCount[2] + stateCount[3] + stateCount[4];
+         if (5 * Math.Abs(stateCountTotal - originalStateCountTotal) >= originalStateCountTotal)
+         {
+            return null;
+         }
+
+         return foundPatternCross(stateCount) ? centerFromEnd(stateCount, j) : null;
+      }
+
+      /// <summary>
+      ///   <p>This is called when a horizontal scan finds a possible alignment pattern. It will
+      /// cross check with a vertical scan, and if successful, will, ah, cross-cross-check
+      /// with another horizontal scan. This is needed primarily to locate the real horizontal
+      /// center of the pattern in cases of extreme skew.
+      /// And then we cross-cross-cross check with another diagonal scan.</p>
+      /// If that succeeds the finder pattern location is added to a list that tracks
+      /// the number of times each location has been nearly-matched as a finder pattern.
+      /// Each additional find is more evidence that the location is in fact a finder
+      /// pattern center
+      /// </summary>
+      /// <param name="stateCount">reading state module counts from horizontal scan</param>
+      /// <param name="i">row where finder pattern may be found</param>
+      /// <param name="j">end of possible finder pattern in row</param>
+      /// <param name="pureBarcode">if set to <c>true</c> [pure barcode].</param>
+      /// <returns>
+      /// true if a finder pattern candidate was found this time
+      /// </returns>
+      protected bool handlePossibleCenter(int[] stateCount, int i, int j, bool pureBarcode)
+      {
+         int stateCountTotal = stateCount[0] + stateCount[1] + stateCount[2] + stateCount[3] +
+             stateCount[4];
+         float? centerJ = centerFromEnd(stateCount, j);
+         if (centerJ == null)
+            return false;
+         float? centerI = crossCheckVertical(i, (int)centerJ.Value, stateCount[2], stateCountTotal);
+         if (centerI != null)
+         {
+            // Re-cross check
+            centerJ = crossCheckHorizontal((int)centerJ.Value, (int)centerI.Value, stateCount[2], stateCountTotal);
+            if (centerJ != null &&
+               (!pureBarcode || crossCheckDiagonal((int) centerI, (int) centerJ, stateCount[2], stateCountTotal)))
+            {
+               float estimatedModuleSize = stateCountTotal / 7.0f;
+               bool found = false;
+               for (int index = 0; index < possibleCenters.Count; index++)
+               {
+                  var center = possibleCenters[index];
+                  // Look for about the same center and module size:
+                  if (center.aboutEquals(estimatedModuleSize, centerI.Value, centerJ.Value))
+                  {
+                     possibleCenters.RemoveAt(index);
+                     possibleCenters.Insert(index, center.combineEstimate(centerI.Value, centerJ.Value, estimatedModuleSize));
+
+                     found = true;
+                     break;
+                  }
+               }
+               if (!found)
+               {
+                  var point = new FinderPattern(centerJ.Value, centerI.Value, estimatedModuleSize);
+
+                  possibleCenters.Add(point);
+                  if (resultPointCallback != null)
+                  {
+
+                     resultPointCallback(point);
+                  }
+               }
+               return true;
+            }
+         }
+         return false;
+      }
+
+      /// <returns> number of rows we could safely skip during scanning, based on the first
+      /// two finder patterns that have been located. In some cases their position will
+      /// allow us to infer that the third pattern must lie below a certain point farther
+      /// down in the image.
+      /// </returns>
+      private int findRowSkip()
+      {
+         int max = possibleCenters.Count;
+         if (max <= 1)
+         {
+            return 0;
+         }
+         ResultPoint firstConfirmedCenter = null;
+         foreach (var center in possibleCenters)
+         {
+            if (center.Count >= CENTER_QUORUM)
+            {
+               if (firstConfirmedCenter == null)
+               {
+                  firstConfirmedCenter = center;
+               }
+               else
+               {
+                  // We have two confirmed centers
+                  // How far down can we skip before resuming looking for the next
+                  // pattern? In the worst case, only the difference between the
+                  // difference in the x / y coordinates of the two centers.
+                  // This is the case where you find top left last.
+                  hasSkipped = true;
+                  //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
+                  return (int)(Math.Abs(firstConfirmedCenter.X - center.X) - Math.Abs(firstConfirmedCenter.Y - center.Y)) / 2;
+               }
+            }
+         }
+         return 0;
+      }
+
+      /// <returns> true iff we have found at least 3 finder patterns that have been detected
+      /// at least {@link #CENTER_QUORUM} times each, and, the estimated module size of the
+      /// candidates is "pretty similar"
+      /// </returns>
+      private bool haveMultiplyConfirmedCenters()
+      {
+         int confirmedCount = 0;
+         float totalModuleSize = 0.0f;
+         int max = possibleCenters.Count;
+         foreach (var pattern in possibleCenters)
+         {
+            if (pattern.Count >= CENTER_QUORUM)
+            {
+               confirmedCount++;
+               totalModuleSize += pattern.EstimatedModuleSize;
+            }
+         }
+         if (confirmedCount < 3)
+         {
+            return false;
+         }
+         // OK, we have at least 3 confirmed centers, but, it's possible that one is a "false positive"
+         // and that we need to keep looking. We detect this by asking if the estimated module sizes
+         // vary too much. We arbitrarily say that when the total deviation from average exceeds
+         // 5% of the total module size estimates, it's too much.
+         float average = totalModuleSize / max;
+         float totalDeviation = 0.0f;
+         for (int i = 0; i < max; i++)
+         {
+            var pattern = possibleCenters[i];
+            totalDeviation += Math.Abs(pattern.EstimatedModuleSize - average);
+         }
+         return totalDeviation <= 0.05f * totalModuleSize;
+      }
+
+      /// <returns> the 3 best {@link FinderPattern}s from our list of candidates. The "best" are
+      /// those that have been detected at least {@link #CENTER_QUORUM} times, and whose module
+      /// size differs from the average among those patterns the least
+      /// </returns>
+      private FinderPattern[] selectBestPatterns()
+      {
+         int startSize = possibleCenters.Count;
+         if (startSize < 3)
+         {
+            // Couldn't find enough finder patterns
+            return null;
+         }
+
+         // Filter outlier possibilities whose module size is too different
+         if (startSize > 3)
+         {
+            // But we can only afford to do so if we have at least 4 possibilities to choose from
+            float totalModuleSize = 0.0f;
+            float square = 0.0f;
+            foreach (var center in possibleCenters)
+            {
+               float size = center.EstimatedModuleSize;
+               totalModuleSize += size;
+               square += size * size;
+            }
+            float average = totalModuleSize / startSize;
+            float stdDev = (float)Math.Sqrt(square / startSize - average * average);
+
+            possibleCenters.Sort(new FurthestFromAverageComparator(average));
+
+            float limit = Math.Max(0.2f * average, stdDev);
+
+            for (int i = 0; i < possibleCenters.Count && possibleCenters.Count > 3; i++)
+            {
+               FinderPattern pattern = possibleCenters[i];
+               if (Math.Abs(pattern.EstimatedModuleSize - average) > limit)
+               {
+                  possibleCenters.RemoveAt(i);
+                  i--;
+               }
+            }
+         }
+
+         if (possibleCenters.Count > 3)
+         {
+            // Throw away all but those first size candidate points we found.
+
+            float totalModuleSize = 0.0f;
+            foreach (var possibleCenter in possibleCenters)
+            {
+               totalModuleSize += possibleCenter.EstimatedModuleSize;
+            }
+
+            float average = totalModuleSize / possibleCenters.Count;
+
+            possibleCenters.Sort(new CenterComparator(average));
+
+            //possibleCenters.subList(3, possibleCenters.Count).clear();
+            possibleCenters = possibleCenters.GetRange(0, 3);
+         }
+
+         return new[]
+                   {
+                      possibleCenters[0],
+                      possibleCenters[1],
+                      possibleCenters[2]
+                   };
+      }
+
+      /// <summary>
+      /// Orders by furthest from average
+      /// </summary>
+      private sealed class FurthestFromAverageComparator : IComparer<FinderPattern>
+      {
+         private readonly float average;
+
+         public FurthestFromAverageComparator(float f)
+         {
+            average = f;
+         }
+
+         public int Compare(FinderPattern x, FinderPattern y)
+         {
+            float dA = Math.Abs(y.EstimatedModuleSize - average);
+            float dB = Math.Abs(x.EstimatedModuleSize - average);
+            return dA < dB ? -1 : dA == dB ? 0 : 1;
+         }
+      }
+
+      /// <summary> <p>Orders by {@link FinderPattern#getCount()}, descending.</p></summary>
+      private sealed class CenterComparator : IComparer<FinderPattern>
+      {
+         private readonly float average;
+
+         public CenterComparator(float f)
+         {
+            average = f;
+         }
+
+         public int Compare(FinderPattern x, FinderPattern y)
+         {
+            if (y.Count == x.Count)
+            {
+               float dA = Math.Abs(y.EstimatedModuleSize - average);
+               float dB = Math.Abs(x.EstimatedModuleSize - average);
+               return dA < dB ? 1 : dA == dB ? 0 : -1;
+            }
+            return y.Count - x.Count;
+         }
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/qrcode/detector/FinderPatternInfo.cs

@@ -0,0 +1,74 @@
+/*
+* Copyright 2007 ZXing authors
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+namespace ZXing.QrCode.Internal
+{
+   /// <summary>
+   /// <p>Encapsulates information about finder patterns in an image, including the location of
+   /// the three finder patterns, and their estimated module size.</p>
+   /// </summary>
+   /// <author>Sean Owen</author>
+   public sealed class FinderPatternInfo
+   {
+      private readonly FinderPattern bottomLeft;
+      private readonly FinderPattern topLeft;
+      private readonly FinderPattern topRight;
+
+      /// <summary>
+      /// Initializes a new instance of the <see cref="FinderPatternInfo"/> class.
+      /// </summary>
+      /// <param name="patternCenters">The pattern centers.</param>
+      public FinderPatternInfo(FinderPattern[] patternCenters)
+      {
+         this.bottomLeft = patternCenters[0];
+         this.topLeft = patternCenters[1];
+         this.topRight = patternCenters[2];
+      }
+
+      /// <summary>
+      /// Gets the bottom left.
+      /// </summary>
+      public FinderPattern BottomLeft
+      {
+         get
+         {
+            return bottomLeft;
+         }
+      }
+
+      /// <summary>
+      /// Gets the top left.
+      /// </summary>
+      public FinderPattern TopLeft
+      {
+         get
+         {
+            return topLeft;
+         }
+      }
+
+      /// <summary>
+      /// Gets the top right.
+      /// </summary>
+      public FinderPattern TopRight
+      {
+         get
+         {
+            return topRight;
+         }
+      }
+   }
+}

shadowsocks-csharp/3rd/zxing/Encoder.cs → shadowsocks-csharp/3rd/zxing/qrcode/encoder/Encoder.cs

@@ -30,6 +30,15 @@ namespace ZXing.QrCode.Internal
    public static class Encoder
    {
 
+      // The original table is defined in the table 5 of JISX0510:2004 (p.19).
+      private static readonly int[] ALPHANUMERIC_TABLE = {
+         -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,  // 0x00-0x0f
+         -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,  // 0x10-0x1f
+         36, -1, -1, -1, 37, 38, -1, -1, -1, -1, 39, 40, -1, 41, 42, 43,  // 0x20-0x2f
+         0,   1,  2,  3,  4,  5,  6,  7,  8,  9, 44, -1, -1, -1, -1, -1,  // 0x30-0x3f
+         -1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,  // 0x40-0x4f
+         25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, -1, -1, -1, -1, -1,  // 0x50-0x5f
+      };
 
       internal static String DEFAULT_BYTE_MODE_ENCODING = "ISO-8859-1";
 
@@ -52,15 +61,32 @@ namespace ZXing.QrCode.Internal
       /// Note that there is no way to encode bytes in MODE_KANJI. We might want to add EncodeWithMode()
       /// with which clients can specify the encoding mode. For now, we don't need the functionality.
       /// </summary>
-      /// <param name="content">text to encode</param>
-      /// <param name="ecLevel">error correction level to use</param>
-      /// <returns><see cref="QRCode"/> representing the encoded QR code</returns>
+      /// <param name="content">The content.</param>
+      /// <param name="ecLevel">The ec level.</param>
       public static QRCode encode(String content, ErrorCorrectionLevel ecLevel)
       {
+         return encode(content, ecLevel, null);
+      }
+
+      /// <summary>
+      /// Encodes the specified content.
+      /// </summary>
+      /// <param name="content">The content.</param>
+      /// <param name="ecLevel">The ec level.</param>
+      /// <param name="hints">The hints.</param>
+      /// <returns></returns>
+      public static QRCode encode(String content,
+                                ErrorCorrectionLevel ecLevel,
+                                IDictionary<EncodeHintType, object> hints)
+      {
          // Determine what character encoding has been specified by the caller, if any
 #if !SILVERLIGHT || WINDOWS_PHONE
-         String encoding = DEFAULT_BYTE_MODE_ENCODING;
-         //bool generateECI = !DEFAULT_BYTE_MODE_ENCODING.Equals(encoding);
+         String encoding = hints == null || !hints.ContainsKey(EncodeHintType.CHARACTER_SET) ? null : (String)hints[EncodeHintType.CHARACTER_SET];
+         if (encoding == null)
+         {
+            encoding = DEFAULT_BYTE_MODE_ENCODING;
+         }
+         bool generateECI = !DEFAULT_BYTE_MODE_ENCODING.Equals(encoding);
 #else
          // Silverlight supports only UTF-8 and UTF-16 out-of-the-box
          const string encoding = "UTF-8";
@@ -71,27 +97,12 @@ namespace ZXing.QrCode.Internal
 
          // Pick an encoding mode appropriate for the content. Note that this will not attempt to use
          // multiple modes / segments even if that were more efficient. Twould be nice.
-         Mode mode = Mode.BYTE;
+         Mode mode = chooseMode(content, encoding);
 
          // This will store the header information, like mode and
          // length, as well as "header" segments like an ECI segment.
          BitArray headerBits = new BitArray();
 
-         /*
-          // Append ECI segment if applicable
-         if (mode == Mode.BYTE && generateECI)
-         {
-            CharacterSetECI eci = CharacterSetECI.getCharacterSetECIByName(encoding);
-            if (eci != null)
-            {
-               var eciIsExplicitDisabled = (hints != null && hints.ContainsKey(EncodeHintType.DISABLE_ECI) ? (bool)hints[EncodeHintType.DISABLE_ECI] : false);
-               if (!eciIsExplicitDisabled)
-               {
-                  appendECI(eci, headerBits);
-               }
-            }
-         }
-          * */
 
          // (With ECI in place,) Write the mode marker
          appendModeInfo(mode, headerBits);
@@ -156,6 +167,42 @@ namespace ZXing.QrCode.Internal
          return qrCode;
       }
 
+      /// <summary>
+      /// Gets the alphanumeric code.
+      /// </summary>
+      /// <param name="code">The code.</param>
+      /// <returns>the code point of the table used in alphanumeric mode or
+      /// -1 if there is no corresponding code in the table.</returns>
+      internal static int getAlphanumericCode(int code)
+      {
+         if (code < ALPHANUMERIC_TABLE.Length)
+         {
+            return ALPHANUMERIC_TABLE[code];
+         }
+         return -1;
+      }
+
+      /// <summary>
+      /// Chooses the mode.
+      /// </summary>
+      /// <param name="content">The content.</param>
+      /// <returns></returns>
+      public static Mode chooseMode(String content)
+      {
+         return chooseMode(content, null);
+      }
+
+      /// <summary>
+      /// Choose the best mode by examining the content. Note that 'encoding' is used as a hint;
+      /// if it is Shift_JIS, and the input is only double-byte Kanji, then we return {@link Mode#KANJI}.
+      /// </summary>
+      /// <param name="content">The content.</param>
+      /// <param name="encoding">The encoding.</param>
+      /// <returns></returns>
+      private static Mode chooseMode(String content, String encoding)
+      {
+         return Mode.BYTE;
+      }
 
       private static int chooseMaskPattern(BitArray bits,
                                            ErrorCorrectionLevel ecLevel,
@@ -199,7 +246,7 @@ namespace ZXing.QrCode.Internal
                return version;
             }
          }
-         throw new Exception("Data too big");
+         throw new WriterException("Data too big");
       }
 
       /// <summary>
@@ -212,7 +259,7 @@ namespace ZXing.QrCode.Internal
          int capacity = numDataBytes << 3;
          if (bits.Size > capacity)
          {
-             throw new Exception("data bits cannot fit in the QR Code" + bits.Size + " > " +
+            throw new WriterException("data bits cannot fit in the QR Code" + bits.Size + " > " +
                 capacity);
          }
          for (int i = 0; i < 4 && bits.Size < capacity; ++i)
@@ -237,7 +284,7 @@ namespace ZXing.QrCode.Internal
          }
          if (bits.Size != capacity)
          {
-             throw new Exception("Bits size does not equal capacity");
+            throw new WriterException("Bits size does not equal capacity");
          }
       }
 
@@ -261,7 +308,7 @@ namespace ZXing.QrCode.Internal
       {
          if (blockID >= numRSBlocks)
          {
-             throw new Exception("Block ID too large");
+            throw new WriterException("Block ID too large");
          }
          // numRsBlocksInGroup2 = 196 % 5 = 1
          int numRsBlocksInGroup2 = numTotalBytes % numRSBlocks;
@@ -284,13 +331,13 @@ namespace ZXing.QrCode.Internal
          if (numEcBytesInGroup1 != numEcBytesInGroup2)
          {
 
-             throw new Exception("EC bytes mismatch");
+            throw new WriterException("EC bytes mismatch");
          }
          // 5 = 4 + 1.
          if (numRSBlocks != numRsBlocksInGroup1 + numRsBlocksInGroup2)
          {
 
-             throw new Exception("RS blocks mismatch");
+            throw new WriterException("RS blocks mismatch");
          }
          // 196 = (13 + 26) * 4 + (14 + 26) * 1
          if (numTotalBytes !=
@@ -299,7 +346,7 @@ namespace ZXing.QrCode.Internal
                  ((numDataBytesInGroup2 + numEcBytesInGroup2) *
                      numRsBlocksInGroup2))
          {
-             throw new Exception("Total bytes mismatch");
+            throw new WriterException("Total bytes mismatch");
          }
 
          if (blockID < numRsBlocksInGroup1)
@@ -335,7 +382,7 @@ namespace ZXing.QrCode.Internal
          if (bits.SizeInBytes != numDataBytes)
          {
 
-             throw new Exception("Number of bits and data bytes does not match");
+            throw new WriterException("Number of bits and data bytes does not match");
          }
 
          // Step 1.  Divide data bytes into blocks and generate error correction bytes for them. We'll
@@ -369,7 +416,7 @@ namespace ZXing.QrCode.Internal
          if (numDataBytes != dataBytesOffset)
          {
 
-             throw new Exception("Data bytes does not match offset");
+            throw new WriterException("Data bytes does not match offset");
          }
 
          BitArray result = new BitArray();
@@ -400,7 +447,7 @@ namespace ZXing.QrCode.Internal
          }
          if (numTotalBytes != result.SizeInBytes)
          {  // Should be same.
-             throw new Exception("Interleaving error: " + numTotalBytes + " and " +
+            throw new WriterException("Interleaving error: " + numTotalBytes + " and " +
                 result.SizeInBytes + " differ.");
          }
 
@@ -450,7 +497,7 @@ namespace ZXing.QrCode.Internal
          int numBits = mode.getCharacterCountBits(version);
          if (numLetters >= (1 << numBits))
          {
-             throw new Exception(numLetters + " is bigger than " + ((1 << numBits) - 1));
+            throw new WriterException(numLetters + " is bigger than " + ((1 << numBits) - 1));
          }
          bits.appendBits(numLetters, numBits);
       }
@@ -467,12 +514,45 @@ namespace ZXing.QrCode.Internal
                               BitArray bits,
                               String encoding)
       {
-               if (mode.Equals(Mode.BYTE))
-                  append8BitBytes(content, bits, encoding);
-                  else
-                      throw new Exception("Invalid mode: " + mode);
+        if (mode.Equals(Mode.BYTE))
+            append8BitBytes(content, bits, encoding);
+            else
+                throw new WriterException("Invalid mode: " + mode);
       }
 
+      internal static void appendNumericBytes(String content, BitArray bits)
+      {
+         int length = content.Length;
+
+         int i = 0;
+         while (i < length)
+         {
+            int num1 = content[i] - '0';
+            if (i + 2 < length)
+            {
+               // Encode three numeric letters in ten bits.
+               int num2 = content[i + 1] - '0';
+               int num3 = content[i + 2] - '0';
+               bits.appendBits(num1 * 100 + num2 * 10 + num3, 10);
+               i += 3;
+            }
+            else if (i + 1 < length)
+            {
+               // Encode two numeric letters in seven bits.
+               int num2 = content[i + 1] - '0';
+               bits.appendBits(num1 * 10 + num2, 7);
+               i += 2;
+            }
+            else
+            {
+               // Encode one numeric letter in four bits.
+               bits.appendBits(num1, 4);
+               i++;
+            }
+         }
+      }
+
+
       internal static void append8BitBytes(String content, BitArray bits, String encoding)
       {
          byte[] bytes;
@@ -504,7 +584,7 @@ namespace ZXing.QrCode.Internal
 #endif
          catch (Exception uee)
          {
-             throw new Exception(uee.Message, uee);
+            throw new WriterException(uee.Message, uee);
          }
          foreach (byte b in bytes)
          {
@@ -512,15 +592,5 @@ namespace ZXing.QrCode.Internal
          }
       }
 
-
-       /*
-      private static void appendECI(CharacterSetECI eci, BitArray bits)
-      {
-         bits.appendBits(Mode.ECI.Bits, 4);
-
-         // This is correct for values up to 127, which is all we need now.
-         bits.appendBits(eci.Value, 8);
-      }
-        * */
    }
 }

shadowsocks-csharp/3rd/zxing/MatrixUtil.cs → shadowsocks-csharp/3rd/zxing/qrcode/encoder/MatrixUtil.cs

@@ -14,7 +14,6 @@
 * limitations under the License.
 */
 
-using System;
 using ZXing.Common;
 
 namespace ZXing.QrCode.Internal
@@ -310,7 +309,7 @@ namespace ZXing.QrCode.Internal
          // All bits should be consumed.
          if (bitIndex != dataBits.Size)
          {
-            throw new Exception("Not all bits consumed: " + bitIndex + '/' + dataBits.Size);
+            throw new WriterException("Not all bits consumed: " + bitIndex + '/' + dataBits.Size);
          }
       }
 
@@ -366,9 +365,6 @@ namespace ZXing.QrCode.Internal
       /// <returns></returns>
       public static int calculateBCHCode(int value, int poly)
       {
-         if (poly == 0)
-            throw new ArgumentException("0 polynominal", "poly");
-
          // If poly is "1 1111 0010 0101" (version info poly), msbSetInPoly is 13. We'll subtract 1
          // from 13 to make it 12.
          int msbSetInPoly = findMSBSet(poly);
@@ -394,7 +390,7 @@ namespace ZXing.QrCode.Internal
       {
          if (!QRCode.isValidMaskPattern(maskPattern))
          {
-             throw new Exception("Invalid mask pattern");
+            throw new WriterException("Invalid mask pattern");
          }
          int typeInfo = (ecLevel.Bits << 3) | maskPattern;
          bits.appendBits(typeInfo, 5);
@@ -409,7 +405,7 @@ namespace ZXing.QrCode.Internal
          if (bits.Size != 15)
          {
             // Just in case.
-             throw new Exception("should not happen but we got: " + bits.Size);
+            throw new WriterException("should not happen but we got: " + bits.Size);
          }
       }
 
@@ -428,7 +424,7 @@ namespace ZXing.QrCode.Internal
          if (bits.Size != 18)
          {
             // Just in case.
-             throw new Exception("should not happen but we got: " + bits.Size);
+            throw new WriterException("should not happen but we got: " + bits.Size);
          }
       }
 
@@ -472,7 +468,7 @@ namespace ZXing.QrCode.Internal
       {
          if (matrix[8, matrix.Height - 8] == 0)
          {
-             throw new Exception();
+            throw new WriterException();
          }
          matrix[8, matrix.Height - 8] = 1;
       }
@@ -483,7 +479,7 @@ namespace ZXing.QrCode.Internal
          {
             if (!isEmpty(matrix[xStart + x, yStart]))
             {
-                throw new Exception();
+               throw new WriterException();
             }
             matrix[xStart + x, yStart] = 0;
          }
@@ -495,7 +491,7 @@ namespace ZXing.QrCode.Internal
          {
             if (!isEmpty(matrix[xStart, yStart + y]))
             {
-                throw new Exception();
+               throw new WriterException();
             }
             matrix[xStart, yStart + y] = 0;
          }

shadowsocks-csharp/3rd/zxing/QRCode.cs → shadowsocks-csharp/3rd/zxing/qrcode/encoder/QRCode.cs

@@ -21,7 +21,7 @@ namespace ZXing.QrCode.Internal
 {
    /// <author>satorux@google.com (Satoru Takabayashi) - creator</author>
    /// <author>dswitkin@google.com (Daniel Switkin) - ported from C++</author>
-   public class QRCode
+   public sealed class QRCode
    {
       /// <summary>
       /// 
@@ -77,6 +77,40 @@ namespace ZXing.QrCode.Internal
       public ByteMatrix Matrix { get; set; }
 
       /// <summary>
+      /// Returns a <see cref="System.String"/> that represents this instance.
+      /// </summary>
+      /// <returns>
+      /// A <see cref="System.String"/> that represents this instance.
+      /// </returns>
+      public override String ToString()
+      {
+         var result = new StringBuilder(200);
+         result.Append("<<\n");
+         result.Append(" mode: ");
+         result.Append(Mode);
+         result.Append("\n ecLevel: ");
+         result.Append(ECLevel);
+         result.Append("\n version: ");
+         if (Version == null)
+            result.Append("null");
+         else
+            result.Append(Version);
+         result.Append("\n maskPattern: ");
+         result.Append(MaskPattern);
+         if (Matrix == null)
+         {
+            result.Append("\n matrix: null\n");
+         }
+         else
+         {
+            result.Append("\n matrix:\n");
+            result.Append(Matrix.ToString());
+         }
+         result.Append(">>\n");
+         return result.ToString();
+      }
+
+      /// <summary>
       /// Check if "mask_pattern" is valid.
       /// </summary>
       /// <param name="maskPattern">The mask pattern.</param>

shadowsocks-csharp/Controller/GfwListUpdater.cs

@@ -0,0 +1,68 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Net;
+using System.IO;
+using Shadowsocks.Properties;
+using SimpleJson;
+using Shadowsocks.Util;
+
+namespace Shadowsocks.Controller
+{
+    public class GFWListUpdater
+    {
+        private const string GFWLIST_URL = "https://autoproxy-gfwlist.googlecode.com/svn/trunk/gfwlist.txt";
+
+        private static string PAC_FILE = PACServer.PAC_FILE;
+
+        public event EventHandler UpdateCompleted;
+
+        public event ErrorEventHandler Error;
+
+        private void http_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
+        {
+            try
+            {
+                List<string> lines = ParseResult(e.Result);
+
+                string abpContent = Utils.UnGzip(Resources.abp_js);
+                abpContent = abpContent.Replace("__RULES__", SimpleJson.SimpleJson.SerializeObject(lines));
+                File.WriteAllText(PAC_FILE, abpContent, Encoding.UTF8);
+                if (UpdateCompleted != null)
+                {
+                    UpdateCompleted(this, new EventArgs());
+                }
+            }
+            catch (Exception ex)
+            {
+                if (Error != null)
+                {
+                    Error(this, new ErrorEventArgs(ex));
+                }
+            }
+        }
+
+        public void UpdatePACFromGFWList()
+        {
+            WebClient http = new WebClient();
+            http.Proxy = new WebProxy(IPAddress.Loopback.ToString(), 8123);
+            http.DownloadStringCompleted += http_DownloadStringCompleted;
+            http.DownloadStringAsync(new Uri(GFWLIST_URL));
+        }
+
+        public List<string> ParseResult(string response)
+        {
+            byte[] bytes = Convert.FromBase64String(response);
+            string content = Encoding.ASCII.GetString(bytes);
+            string[] lines = content.Split(new char[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries);
+            List<string> valid_lines = new List<string>(lines.Length);
+            foreach (string line in lines)
+            {
+                if (line.StartsWith("!") || line.StartsWith("["))
+                    continue;
+                valid_lines.Add(line);
+            }
+            return valid_lines;
+        }
+    }
+}

shadowsocks-csharp/Controller/PACServer.cs

@@ -1,5 +1,6 @@
 using Shadowsocks.Model;
 using Shadowsocks.Properties;
+using Shadowsocks.Util;
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
@@ -14,7 +15,7 @@ namespace Shadowsocks.Controller
     class PACServer
     {
         private static int PORT = 8093;
-        private static string PAC_FILE = "pac.txt";
+        public static string PAC_FILE = "pac.txt";
         private static Configuration config;
 
         Socket _listener;
@@ -130,19 +131,7 @@ namespace Shadowsocks.Controller
             }
             else
             {
-                byte[] pacGZ = Resources.proxy_pac_txt;
-                byte[] buffer = new byte[1024];  // builtin pac gzip size: maximum 100K
-                MemoryStream sb = new MemoryStream();
-                int n;
-                using (GZipStream input = new GZipStream(new MemoryStream(pacGZ),
-                    CompressionMode.Decompress, false))
-                {
-                    while((n = input.Read(buffer, 0, buffer.Length)) > 0)
-                    {
-                        sb.Write(buffer, 0, n);
-                    }
-                    return System.Text.Encoding.UTF8.GetString(sb.ToArray());
-                }
+                return Utils.UnGzip(Resources.proxy_pac_txt);
             }
         }
 
@@ -175,7 +164,7 @@ Connection: Close
 ", System.Text.Encoding.UTF8.GetBytes(pac).Length) + pac;
                     byte[] response = System.Text.Encoding.UTF8.GetBytes(text);
                     conn.BeginSend(response, 0, response.Length, 0, new AsyncCallback(SendCallback), conn);
-                    Util.Util.ReleaseMemory();
+                    Util.Utils.ReleaseMemory();
                 }
                 else
                 {

shadowsocks-csharp/Controller/PolipoRunner.cs

@@ -12,6 +12,20 @@ namespace Shadowsocks.Controller
     class PolipoRunner
     {
         private Process _process;
+        private static string temppath;
+
+        static PolipoRunner()
+        {
+            temppath = Path.GetTempPath();
+            try
+            {
+                FileManager.UncompressFile(temppath + "/ss_polipo.exe", Resources.polipo_exe);
+            }
+            catch (IOException e)
+            {
+                Logging.LogUsefulException(e);
+            }
+        }
 
         public void Start(Configuration configuration)
         {
@@ -31,12 +45,10 @@ namespace Shadowsocks.Controller
                         Console.WriteLine(e.ToString());
                     }
                 }
-                string temppath = Path.GetTempPath();
                 string polipoConfig = Resources.polipo_config; 
                 polipoConfig = polipoConfig.Replace("__SOCKS_PORT__", server.local_port.ToString());
                 polipoConfig = polipoConfig.Replace("__POLIPO_BIND_IP__", configuration.shareOverLan ? "0.0.0.0" : "127.0.0.1");
                 FileManager.ByteArrayToFile(temppath + "/polipo.conf", System.Text.Encoding.UTF8.GetBytes(polipoConfig));
-                FileManager.UncompressFile(temppath + "/ss_polipo.exe", Resources.polipo_exe);
 
                 _process = new Process();
                 // Configure the process using the StartInfo properties.

shadowsocks-csharp/Controller/ShadowsocksController.cs

@@ -21,6 +21,7 @@ namespace Shadowsocks.Controller
         private PACServer pacServer;
         private Configuration _config;
         private PolipoRunner polipoRunner;
+        private GFWListUpdater gfwListUpdater;
         private bool stopped = false;
 
         private bool _systemProxyIsDirty = false;
@@ -38,6 +39,10 @@ namespace Shadowsocks.Controller
         // when user clicked Edit PAC, and PAC file has already created
         public event EventHandler<PathEventArgs> PACFileReadyToOpen;
 
+        public event EventHandler UpdatePACFromGFWListCompleted;
+
+        public event ErrorEventHandler UpdatePACFromGFWListError;
+
         public event ErrorEventHandler Errored;
 
         public ShadowsocksController()
@@ -75,6 +80,23 @@ namespace Shadowsocks.Controller
             SaveConfig(_config);
         }
 
+        public bool AddServerBySSURL(string ssURL)
+        {
+            try
+            {
+                var server = new Server(ssURL);
+                _config.configs.Add(server);
+                _config.index = _config.configs.Count - 1;
+                SaveConfig(_config);
+                return true;
+            }
+            catch (Exception e)
+            {
+                Logging.LogUsefulException(e);
+                return false;
+            }
+        }
+
         public void ToggleEnable(bool enabled)
         {
             _config.enabled = enabled;
@@ -151,6 +173,14 @@ namespace Shadowsocks.Controller
             return "ss://" + base64;
         }
 
+        public void UpdatePACFromGFWList()
+        {
+            if (gfwListUpdater != null)
+            {
+                gfwListUpdater.UpdatePACFromGFWList();
+            }
+        }
+
         protected void Reload()
         {
             // some logic in configuration updated the config when saving, we need to read it again
@@ -165,6 +195,12 @@ namespace Shadowsocks.Controller
                 pacServer = new PACServer();
                 pacServer.PACFileChanged += pacServer_PACFileChanged;
             }
+            if (gfwListUpdater == null)
+            {
+                gfwListUpdater = new GFWListUpdater();
+                gfwListUpdater.UpdateCompleted += pacServer_PACUpdateCompleted;
+                gfwListUpdater.Error += pacServer_PACUpdateError;
+            }
 
             pacServer.Stop();
 
@@ -208,7 +244,7 @@ namespace Shadowsocks.Controller
             }
 
             UpdateSystemProxy();
-            Util.Util.ReleaseMemory();
+            Util.Utils.ReleaseMemory();
         }
 
 
@@ -242,6 +278,18 @@ namespace Shadowsocks.Controller
             UpdateSystemProxy();
         }
 
+        private void pacServer_PACUpdateCompleted(object sender, EventArgs e)
+        {
+            if (UpdatePACFromGFWListCompleted != null)
+                UpdatePACFromGFWListCompleted(this, e);
+        }
+
+        private void pacServer_PACUpdateError(object sender, ErrorEventArgs e)
+        {
+            if (UpdatePACFromGFWListError != null)
+                UpdatePACFromGFWListError(this, e);
+        }
+
         private void StartReleasingMemory()
         {
             _ramThread = new Thread(new ThreadStart(ReleaseMemory));
@@ -253,7 +301,7 @@ namespace Shadowsocks.Controller
         {
             while (true)
             {
-                Util.Util.ReleaseMemory();
+                Util.Utils.ReleaseMemory();
                 Thread.Sleep(30 * 1000);
             }
         }

shadowsocks-csharp/Controller/SystemProxy.cs

@@ -4,6 +4,7 @@ using System;
 using System.Collections.Generic;
 using System.Runtime.InteropServices;
 using System.Text;
+using System.IO;
 
 namespace Shadowsocks.Controller
 {
@@ -47,10 +48,11 @@ namespace Shadowsocks.Controller
                 //Must Notify IE first, or the connections do not chanage
                 CopyProxySettingFromLan();
             }
-            catch (Exception)
+            catch (Exception e)
             {
-                MessageBox.Show("can not change registry!");
-                throw;
+                Logging.LogUsefulException(e);
+                // TODO this should be moved into views
+                MessageBox.Show(I18N.GetString("Failed to update registry"));
             }
         }
 
@@ -67,10 +69,11 @@ namespace Shadowsocks.Controller
                 SystemProxy.NotifyIE();
                 CopyProxySettingFromLan();
             }
-            catch (Exception)
+            catch (Exception e)
             {
-                MessageBox.Show("can not change registry!");
-                throw;
+                Logging.LogUsefulException(e);
+                // TODO this should be moved into views
+                MessageBox.Show(I18N.GetString("Failed to update registry"));
             }
         }
 
@@ -79,18 +82,24 @@ namespace Shadowsocks.Controller
             RegistryKey registry =
                 Registry.CurrentUser.OpenSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings\\Connections",
                     true);
-            var defulatValue = registry.GetValue("DefaultConnectionSettings");
-            var connections = registry.GetValueNames();
-            foreach (String each in connections){
-                if (!(each.Equals("DefaultConnectionSettings")
-                    || each.Equals("LAN Connection")
-                    || each.Equals("SavedLegacySettings")))
+            var defaultValue = registry.GetValue("DefaultConnectionSettings");
+            try
+            {
+                var connections = registry.GetValueNames();
+                foreach (String each in connections)
                 {
-                    //set all the connections's proxy as the lan
-                    registry.SetValue(each, defulatValue);
+                    if (!(each.Equals("DefaultConnectionSettings")
+                        || each.Equals("LAN Connection")
+                        || each.Equals("SavedLegacySettings")))
+                    {
+                        //set all the connections's proxy as the lan
+                        registry.SetValue(each, defaultValue);
+                    }
                 }
+                SystemProxy.NotifyIE();
+            } catch (IOException e) {
+                Logging.LogUsefulException(e);
             }
-            NotifyIE();
         }
 
         private static String GetTimestamp(DateTime value)

shadowsocks-csharp/Controller/UpdateChecker.cs

@@ -17,12 +17,13 @@ namespace Shadowsocks.Controller
         public string LatestVersionURL;
         public event EventHandler NewVersionFound;
 
-        public const string Version = "2.1.6";
+        public const string Version = "2.2";
 
         public void CheckUpdate()
         {
             // TODO test failures
             WebClient http = new WebClient();
+            http.Proxy = new WebProxy(IPAddress.Loopback.ToString(), 8123);
             http.DownloadStringCompleted += http_DownloadStringCompleted;
             http.DownloadStringAsync(new Uri(UpdateURL));
         }

shadowsocks-csharp/Data/cn.txt

@@ -3,12 +3,13 @@ Enable=启用代理
 Mode=代理模式
 PAC=PAC 模式
 Global=全局模式
-Servers=服务器选择
+Servers=服务器
 Edit Servers...=编辑服务器...
 Start on Boot=开机启动
 Share over LAN=在局域网共享代理
 Edit PAC File...=编辑 PAC 文件...
 Show QRCode...=显示二维码...
+Scan QRCode from Screen...=扫描屏幕上的二维码...
 Show Logs...=显示日志...
 About...=关于...
 Quit=退出
@@ -39,3 +40,9 @@ Shadowsocks is here=Shadowsocks 在这里
 You can turn on/off Shadowsocks in the context menu=可以在右键菜单中开关 Shadowsocks
 Enabled=已启用代理
 Disabled=已禁用代理
+Update PAC from GFWList=从 GFWList 更新 PAC
+Failed to update PAC file =更新 PAC 文件失败
+PAC updated=更新 PAC 成功
+No QRCode found. Try to zoom in or move it to the center of the screen.=找不到二维码，尝试把它放大或者移动到靠近屏幕中间的位置
+Failed to decode QRCode=无法解析二维码
+Failed to update registry=无法修改注册表

shadowsocks-csharp/Model/Configuration.cs

@@ -94,15 +94,7 @@ namespace Shadowsocks.Model
 
         public static Server GetDefaultServer()
         {
-            return new Server()
-            {
-                server = "",
-                server_port = 8388,
-                local_port = 1080,
-                method = "aes-256-cfb",
-                password = "",
-                remarks = ""
-            };
+            return new Server();
         }
 
         private static void Assert(bool condition)

shadowsocks-csharp/Model/Server.cs

@@ -5,6 +5,7 @@ using System.IO;
 using System.Diagnostics;
 using SimpleJson;
 using Shadowsocks.Controller;
+using System.Text.RegularExpressions;
 
 namespace Shadowsocks.Model
 {
@@ -33,5 +34,41 @@ namespace Shadowsocks.Model
                 return remarks + " (" + server + ":" + server_port + ")";
             }
         }
+
+        public Server()
+        {
+            this.server = "";
+            this.server_port = 8388;
+            this.local_port = 1080;
+            this.method = "aes-256-cfb";
+            this.password = "";
+            this.remarks = "";
+        }
+
+        public Server(string ssURL) : this()
+        {
+            string[] r1 = Regex.Split(ssURL, "ss://", RegexOptions.IgnoreCase);
+            string base64 = r1[1].ToString();
+            byte[] bytes = null;
+            for (var i = 0; i < 3; i++) {
+                try
+                {
+                    bytes = System.Convert.FromBase64String(base64);
+                }
+                catch (FormatException)
+                {
+                    base64 += "=";
+                }
+            }
+            if (bytes == null)
+            {
+                throw new FormatException();
+            }
+            string[] parts = Encoding.UTF8.GetString(bytes).Split(new char[2] { ':', '@' });
+            this.method = parts[0].ToString();
+            this.password = parts[1].ToString();
+            this.server = parts[2].ToString();
+            this.server_port = int.Parse(parts[3].ToString());
+        }
     }
 }

shadowsocks-csharp/Program.cs

@@ -18,7 +18,7 @@ namespace Shadowsocks
         [STAThread]
         static void Main()
         {
-            Util.Util.ReleaseMemory();
+            Util.Utils.ReleaseMemory();
             using (Mutex mutex = new Mutex(false, "Global\\" + "71981632-A427-497F-AB91-241CD227EC1F"))
             {
                 Application.EnableVisualStyles();

shadowsocks-csharp/Properties/Resources.Designer.cs

@@ -61,17 +61,28 @@ namespace Shadowsocks.Properties {
         }
         
         /// <summary>
+        ///   Looks up a localized resource of type System.Byte[].
+        /// </summary>
+        internal static byte[] abp_js {
+            get {
+                object obj = ResourceManager.GetObject("abp_js", resourceCulture);
+                return ((byte[])(obj));
+            }
+        }
+        
+        /// <summary>
         ///   Looks up a localized string similar to Shadowsocks=Shadowsocks
         ///Enable=启用代理
         ///Mode=代理模式
         ///PAC=PAC 模式
         ///Global=全局模式
-        ///Servers=服务器选择
+        ///Servers=服务器
         ///Edit Servers...=编辑服务器...
-        ///Start on Boot=自动启动
+        ///Start on Boot=开机启动
         ///Share over LAN=在局域网共享代理
         ///Edit PAC File...=编辑 PAC 文件...
         ///Show QRCode...=显示二维码...
+        ///Scan QRCode from Screen...=扫描屏幕上的二维码...
         ///Show Logs...=显示日志...
         ///About...=关于...
         ///Quit=退出
@@ -89,9 +100,7 @@ namespace Shadowsocks.Properties {
         ///Cancel=取消
         ///New server=未配置的服务器
         ///QRCode=二维码
-        ///Shadowsocks Error: {0}=Shadowsocks 错误: {0}
-        ///Port already in use=端口已被占用
-        ///Il [rest of string was truncated]&quot;;.
+        ///Shadowsocks Error: {0}=Shadowsocks [rest of string was truncated]&quot;;.
         /// </summary>
         internal static string cn {
             get {

shadowsocks-csharp/Properties/Resources.resx

@@ -118,6 +118,9 @@
     <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
   <assembly alias="System.Windows.Forms" name="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
+  <data name="abp_js" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\Data\abp.js.gz;System.Byte[], mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </data>
   <data name="cn" type="System.Resources.ResXFileRef, System.Windows.Forms">
     <value>..\data\cn.txt;System.String, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089;utf-8</value>
   </data>

shadowsocks-csharp/Util/Util.cs

@@ -1,12 +1,14 @@
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.IO;
+using System.IO.Compression;
 using System.Runtime.InteropServices;
 using System.Text;
 
 namespace Shadowsocks.Util
 {
-    public class Util
+    public class Utils
     {
         public static void ReleaseMemory()
         {
@@ -22,6 +24,24 @@ namespace Shadowsocks.Util
                 (UIntPtr)0xFFFFFFFF, (UIntPtr)0xFFFFFFFF);
         }
 
+        public static string UnGzip(byte[] buf)
+        {
+            byte[] buffer = new byte[1024];
+            int n;
+            using (MemoryStream sb = new MemoryStream())
+            {
+                using (GZipStream input = new GZipStream(new MemoryStream(buf),
+                    CompressionMode.Decompress, false))
+                {
+                    while ((n = input.Read(buffer, 0, buffer.Length)) > 0)
+                    {
+                        sb.Write(buffer, 0, n);
+                    }
+                }
+                return System.Text.Encoding.UTF8.GetString(sb.ToArray());
+            }
+        }
+
         [DllImport("kernel32.dll")]
         [return: MarshalAs(UnmanagedType.Bool)]
         private static extern bool SetProcessWorkingSetSize(IntPtr process,

shadowsocks-csharp/View/MenuViewController.cs

@@ -7,6 +7,9 @@ using System.Diagnostics;
 using System.Drawing;
 using System.Text;
 using System.Windows.Forms;
+using ZXing;
+using ZXing.Common;
+using ZXing.QrCode;
 
 namespace Shadowsocks.View
 {
@@ -32,6 +35,7 @@ namespace Shadowsocks.View
         private MenuItem globalModeItem;
         private MenuItem PACModeItem;
         private ConfigForm configForm;
+        private string _urlToOpen;
 
         public MenuViewController(ShadowsocksController controller)
         {
@@ -45,6 +49,8 @@ namespace Shadowsocks.View
             controller.ShareOverLANStatusChanged += controller_ShareOverLANStatusChanged;
             controller.EnableGlobalChanged += controller_EnableGlobalChanged;
             controller.Errored += controller_Errored;
+            controller.UpdatePACFromGFWListCompleted += controller_UpdatePACFromGFWListCompleted;
+            controller.UpdatePACFromGFWListError += controller_UpdatePACFromGFWListError;
 
             _notifyIcon = new NotifyIcon();
             UpdateTrayIcon();
@@ -132,14 +138,16 @@ namespace Shadowsocks.View
                 }),
                 this.ServersItem = CreateMenuGroup("Servers", new MenuItem[] {
                     this.SeperatorItem = new MenuItem("-"),
-                    this.ConfigItem = CreateMenuItem("Edit Servers...", new EventHandler(this.Config_Click))
+                    this.ConfigItem = CreateMenuItem("Edit Servers...", new EventHandler(this.Config_Click)),
+                    CreateMenuItem("Show QRCode...", new EventHandler(this.QRCodeItem_Click)),
+                    CreateMenuItem("Scan QRCode from Screen...", new EventHandler(this.ScanQRCodeItem_Click))
                 }),
                 new MenuItem("-"),
                 this.AutoStartupItem = CreateMenuItem("Start on Boot", new EventHandler(this.AutoStartupItem_Click)),
                 this.ShareOverLANItem = CreateMenuItem("Share over LAN", new EventHandler(this.ShareOverLANItem_Click)),
                 CreateMenuItem("Edit PAC File...", new EventHandler(this.EditPACFileItem_Click)),
+                CreateMenuItem("Update PAC from GFWList", new EventHandler(this.UpdatePACFromGFWListItem_Click)),
                 new MenuItem("-"),
-                CreateMenuItem("Show QRCode...", new EventHandler(this.QRCodeItem_Click)),
                 CreateMenuItem("Show Logs...", new EventHandler(this.ShowLogItem_Click)),
                 CreateMenuItem("About...", new EventHandler(this.AboutItem_Click)),
                 new MenuItem("-"),
@@ -176,19 +184,36 @@ namespace Shadowsocks.View
             System.Diagnostics.Process.Start("explorer.exe", argument);
         }
 
+        void ShowBalloonTip(string title, string content, ToolTipIcon icon, int timeout)
+        {
+            _notifyIcon.BalloonTipTitle = title;
+            _notifyIcon.BalloonTipText = content;
+            _notifyIcon.BalloonTipIcon = icon;
+            _notifyIcon.ShowBalloonTip(timeout);
+        }
+
+        void controller_UpdatePACFromGFWListError(object sender, System.IO.ErrorEventArgs e)
+        {
+            ShowBalloonTip(I18N.GetString("Failed to update PAC file"), e.GetException().Message, ToolTipIcon.Error, 5000);
+            Logging.LogUsefulException(e.GetException());
+        }
+
+        void controller_UpdatePACFromGFWListCompleted(object sender, EventArgs e)
+        {
+            ShowBalloonTip(I18N.GetString("Shadowsocks"), I18N.GetString("PAC updated"), ToolTipIcon.Info, 1000);
+        }
+
         void updateChecker_NewVersionFound(object sender, EventArgs e)
         {
-            _notifyIcon.BalloonTipTitle = String.Format(I18N.GetString("Shadowsocks {0} Update Found"), updateChecker.LatestVersionNumber);
-            _notifyIcon.BalloonTipText = I18N.GetString("Click here to download");
-            _notifyIcon.BalloonTipIcon = ToolTipIcon.Info;
+            ShowBalloonTip(String.Format(I18N.GetString("Shadowsocks {0} Update Found"), updateChecker.LatestVersionNumber), I18N.GetString("Click here to download"), ToolTipIcon.Info, 5000);
             _notifyIcon.BalloonTipClicked += notifyIcon1_BalloonTipClicked;
-            _notifyIcon.ShowBalloonTip(5000);
             _isFirstRun = false;
         }
 
         void notifyIcon1_BalloonTipClicked(object sender, EventArgs e)
         {
             System.Diagnostics.Process.Start(updateChecker.LatestVersionURL);
+            _notifyIcon.BalloonTipClicked -= notifyIcon1_BalloonTipClicked;
         }
 
 
@@ -206,8 +231,10 @@ namespace Shadowsocks.View
         private void UpdateServersMenu()
         {
             var items = ServersItem.MenuItems;
-
-            items.Clear();
+            while (items[0] != SeperatorItem)
+            {
+                items.RemoveAt(0);
+            }
 
             Configuration configuration = controller.GetConfiguration();
             for (int i = 0; i < configuration.configs.Count; i++)
@@ -216,10 +243,8 @@ namespace Shadowsocks.View
                 MenuItem item = new MenuItem(server.FriendlyName());
                 item.Tag = i;
                 item.Click += AServerItem_Click;
-                items.Add(item);
+                items.Add(i, item);
             }
-            items.Add(SeperatorItem);
-            items.Add(ConfigItem);
 
             if (configuration.index >= 0 && configuration.index < configuration.configs.Count)
             {
@@ -244,7 +269,7 @@ namespace Shadowsocks.View
         void configForm_FormClosed(object sender, FormClosedEventArgs e)
         {
             configForm = null;
-            Util.Util.ReleaseMemory();
+            Util.Utils.ReleaseMemory();
             ShowFirstTimeBalloon();
         }
 
@@ -311,6 +336,11 @@ namespace Shadowsocks.View
             controller.TouchPACFile();
         }
 
+        private void UpdatePACFromGFWListItem_Click(object sender, EventArgs e)
+        {
+            controller.UpdatePACFromGFWList();
+        }
+
         private void AServerItem_Click(object sender, EventArgs e)
         {
             MenuItem item = (MenuItem)sender;
@@ -332,10 +362,104 @@ namespace Shadowsocks.View
             qrCodeForm.Show();
         }
 
+        private void ScanQRCodeItem_Click(object sender, EventArgs e)
+        {
+            foreach (Screen screen in Screen.AllScreens)
+            {
+                using (Bitmap fullImage = new Bitmap(screen.Bounds.Width,
+                                                screen.Bounds.Height))
+                {
+                    using (Graphics g = Graphics.FromImage(fullImage))
+                    {
+                        g.CopyFromScreen(screen.Bounds.X,
+                                         screen.Bounds.Y,
+                                         0, 0,
+                                         fullImage.Size,
+                                         CopyPixelOperation.SourceCopy);
+                    }
+                    int maxTry = 10;
+                    for (int i = 0; i < maxTry; i++)
+                    {
+                        int marginLeft = (int)((double)fullImage.Width * i / 2.5 / maxTry);
+                        int marginTop = (int)((double)fullImage.Height * i / 2.5 / maxTry);
+                        Rectangle cropRect = new Rectangle(marginLeft, marginTop, fullImage.Width - marginLeft * 2, fullImage.Height - marginTop * 2);
+                        Bitmap target = new Bitmap(screen.Bounds.Width, screen.Bounds.Height);
+
+                        double imageScale = (double)screen.Bounds.Width / (double)cropRect.Width;
+                        using (Graphics g = Graphics.FromImage(target))
+                        {
+                            g.DrawImage(fullImage, new Rectangle(0, 0, target.Width, target.Height),
+                                            cropRect,
+                                            GraphicsUnit.Pixel);
+                        }
+                        var source = new BitmapLuminanceSource(target);
+                        var bitmap = new BinaryBitmap(new HybridBinarizer(source));
+                        QRCodeReader reader = new QRCodeReader();
+                        var result = reader.decode(bitmap);
+                        if (result != null)
+                        {
+                            var success = controller.AddServerBySSURL(result.Text);
+                            QRCodeSplashForm splash = new QRCodeSplashForm();
+                            if (success)
+                            {
+                                splash.FormClosed += splash_FormClosed;
+                            }
+                            else if (result.Text.StartsWith("http://") || result.Text.StartsWith("https://"))
+                            {
+                                _urlToOpen = result.Text;
+                                splash.FormClosed += openURLFromQRCode;
+                            }
+                            else
+                            {
+                                MessageBox.Show(I18N.GetString("Failed to decode QRCode"));
+                                return;
+                            }
+                            double minX = Int32.MaxValue, minY = Int32.MaxValue, maxX = 0, maxY = 0;
+                            foreach (ResultPoint point in result.ResultPoints)
+                            {
+                                minX = Math.Min(minX, point.X);
+                                minY = Math.Min(minY, point.Y);
+                                maxX = Math.Max(maxX, point.X);
+                                maxY = Math.Max(maxY, point.Y);
+                            }
+                            minX /= imageScale;
+                            minY /= imageScale;
+                            maxX /= imageScale;
+                            maxY /= imageScale;
+                            // make it 20% larger
+                            double margin = (maxX - minX) * 0.20f;
+                            minX += -margin + marginLeft;
+                            maxX += margin + marginLeft;
+                            minY += -margin + marginTop;
+                            maxY += margin + marginTop;
+                            splash.Location = new Point(screen.Bounds.X, screen.Bounds.Y);
+                            // we need a panel because a window has a minimal size
+                            // TODO: test on high DPI
+                            splash.TargetRect = new Rectangle((int)minX + screen.Bounds.X, (int)minY + screen.Bounds.Y, (int)maxX - (int)minX, (int)maxY - (int)minY);
+                            splash.Size = new Size(fullImage.Width, fullImage.Height);
+                            splash.Show();
+                            return;
+                        }
+                    }
+                }
+            }
+            MessageBox.Show(I18N.GetString("No QRCode found. Try to zoom in or move it to the center of the screen."));
+        }
+
+        void splash_FormClosed(object sender, FormClosedEventArgs e)
+        {
+            ShowConfigForm();
+        }
+
+        void openURLFromQRCode(object sender, FormClosedEventArgs e)
+        {
+            Process.Start(_urlToOpen);
+        }
+
 		private void AutoStartupItem_Click(object sender, EventArgs e) {
 			AutoStartupItem.Checked = !AutoStartupItem.Checked;
 			if (!AutoStartup.Set(AutoStartupItem.Checked)) {
-				MessageBox.Show("Failed to edit registry");
+				MessageBox.Show(I18N.GetString("Failed to update registry"));
 			}
 		}
     }

shadowsocks-csharp/View/QRCodeForm.Designer.cs

@@ -34,7 +34,7 @@
             // 
             // pictureBox1
             // 
-            this.pictureBox1.Location = new System.Drawing.Point(9, 9);
+            this.pictureBox1.Location = new System.Drawing.Point(10, 10);
             this.pictureBox1.Margin = new System.Windows.Forms.Padding(0);
             this.pictureBox1.Name = "pictureBox1";
             this.pictureBox1.Size = new System.Drawing.Size(210, 210);
@@ -55,7 +55,7 @@
             this.MaximizeBox = false;
             this.MinimizeBox = false;
             this.Name = "QRCodeForm";
-            this.Padding = new System.Windows.Forms.Padding(9);
+            this.Padding = new System.Windows.Forms.Padding(10);
             this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
             this.Text = "QRCode";
             this.Load += new System.EventHandler(this.QRCodeForm_Load);

shadowsocks-csharp/View/QRCodeForm.cs

@@ -30,7 +30,7 @@ namespace Shadowsocks.View
             string qrText = ssconfig;
             QRCode code = ZXing.QrCode.Internal.Encoder.encode(qrText, ErrorCorrectionLevel.M);
             ByteMatrix m = code.Matrix;
-            int blockSize = Math.Max(200 / m.Height, 1);
+            int blockSize = Math.Max(pictureBox1.Height / m.Height, 1);
             Bitmap drawArea = new Bitmap((m.Width * blockSize), (m.Height * blockSize));
             using (Graphics g = Graphics.FromImage(drawArea))
             {

shadowsocks-csharp/View/QRCodeSplashForm.cs

@@ -0,0 +1,302 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Text;
+using System.Windows.Forms;
+using System.Drawing.Imaging;
+using System.Runtime.InteropServices;
+using System.Diagnostics;
+
+
+namespace Shadowsocks.View
+{
+    public class QRCodeSplashForm : PerPixelAlphaForm
+    {
+        public Rectangle TargetRect;
+
+        public QRCodeSplashForm()
+        {
+            this.Load += QRCodeSplashForm_Load;
+            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;
+            this.BackColor = System.Drawing.Color.White;
+            this.ClientSize = new System.Drawing.Size(1, 1);
+            this.ControlBox = false;
+            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
+            this.MaximizeBox = false;
+            this.MinimizeBox = false;
+            this.Name = "QRCodeSplashForm";
+            this.ShowIcon = false;
+            this.ShowInTaskbar = false;
+            this.SizeGripStyle = System.Windows.Forms.SizeGripStyle.Hide;
+            this.StartPosition = System.Windows.Forms.FormStartPosition.Manual;
+            this.TopMost = true;
+        }
+
+        private Timer timer;
+        private int flashStep;
+        private static double FPS = 1.0 / 15 * 1000; // System.Windows.Forms.Timer resolution is 15ms
+        private static double ANIMATION_TIME = 0.5;
+        private static int ANIMATION_STEPS = (int)(ANIMATION_TIME * FPS);
+        Stopwatch sw;
+        int x;
+        int y;
+        int w;
+        int h;
+        Bitmap bitmap;
+        Graphics g;
+        Pen pen;
+        SolidBrush brush;
+
+        private void QRCodeSplashForm_Load(object sender, EventArgs e)
+        {
+            SetStyle(ControlStyles.SupportsTransparentBackColor, true);
+            this.BackColor = Color.Transparent;
+            flashStep = 0;
+            x = 0;
+            y = 0;
+            w = Width;
+            h = Height;
+            sw = Stopwatch.StartNew();
+            timer = new Timer();
+            timer.Interval = (int)(ANIMATION_TIME * 1000 / ANIMATION_STEPS);
+            timer.Tick += timer_Tick;
+            timer.Start();
+            bitmap = new Bitmap(Width, Height, PixelFormat.Format32bppArgb);
+            g = Graphics.FromImage(bitmap);
+            pen = new Pen(Color.Red, 3);
+            brush = new SolidBrush(Color.FromArgb(30, Color.Red));
+        }
+
+        protected override CreateParams CreateParams
+        {
+            get
+            {
+                CreateParams cp = base.CreateParams;
+                cp.ExStyle |= 0x00080000; // This form has to have the WS_EX_LAYERED extended style
+                return cp;
+            }
+        }
+
+        void timer_Tick(object sender, EventArgs e)
+        {
+            double percent = (double)sw.ElapsedMilliseconds / 1000.0 / (double)ANIMATION_TIME;
+            if (percent < 1)
+            {
+                // ease out
+                percent = 1 - Math.Pow((1 - percent), 4);
+                x = (int)(TargetRect.X * percent);
+                y = (int)(TargetRect.Y * percent);
+                w = (int)(TargetRect.Width * percent + this.Size.Width * (1 - percent));
+                h = (int)(TargetRect.Height * percent + this.Size.Height * (1 - percent));
+                //codeRectView.Location = new Point(x, y);
+                //codeRectView.Size = new Size(w, h);
+                pen.Color = Color.FromArgb((int)(255 * percent), Color.Red);
+                brush.Color = Color.FromArgb((int)(30 * percent), Color.Red);
+                g.Clear(Color.Transparent);
+                g.FillRectangle(brush, x, y, w, h);
+                g.DrawRectangle(pen, x, y, w, h);
+                SetBitmap(bitmap);
+            }
+            else
+            {
+                if (flashStep == 0)
+                {
+                    timer.Interval = 100;
+                    g.Clear(Color.Transparent);
+                    SetBitmap(bitmap);
+                }
+                else if (flashStep == 1)
+                {
+                    timer.Interval = 50;
+                    g.FillRectangle(brush, x, y, w, h);
+                    g.DrawRectangle(pen, x, y, w, h);
+                    SetBitmap(bitmap);
+                }
+                else if (flashStep == 1)
+                {
+                    g.Clear(Color.Transparent);
+                    SetBitmap(bitmap);
+                }
+                else if (flashStep == 2)
+                {
+                    g.FillRectangle(brush, x, y, w, h);
+                    g.DrawRectangle(pen, x, y, w, h);
+                    SetBitmap(bitmap);
+                }
+                else if (flashStep == 3)
+                {
+                    g.Clear(Color.Transparent);
+                    SetBitmap(bitmap);
+                }
+                else if (flashStep == 4)
+                {
+                    g.FillRectangle(brush, x, y, w, h);
+                    g.DrawRectangle(pen, x, y, w, h);
+                    SetBitmap(bitmap);
+                }
+                else
+                {
+                    sw.Stop();
+                    timer.Stop();
+                    pen.Dispose();
+                    brush.Dispose();
+                    bitmap.Dispose();
+                    this.Close();
+                }
+                flashStep++;
+            }
+        }
+    }
+
+
+    // class that exposes needed win32 gdi functions.
+    class Win32
+    {
+
+        [StructLayout(LayoutKind.Sequential)]
+        public struct Point
+        {
+            public Int32 x;
+            public Int32 y;
+
+            public Point(Int32 x, Int32 y) { this.x = x; this.y = y; }
+        }
+
+
+        [StructLayout(LayoutKind.Sequential)]
+        public struct Size
+        {
+            public Int32 cx;
+            public Int32 cy;
+
+            public Size(Int32 cx, Int32 cy) { this.cx = cx; this.cy = cy; }
+        }
+
+
+        [StructLayout(LayoutKind.Sequential, Pack = 1)]
+        struct ARGB
+        {
+            public byte Blue;
+            public byte Green;
+            public byte Red;
+            public byte Alpha;
+        }
+
+
+        [StructLayout(LayoutKind.Sequential, Pack = 1)]
+        public struct BLENDFUNCTION
+        {
+            public byte BlendOp;
+            public byte BlendFlags;
+            public byte SourceConstantAlpha;
+            public byte AlphaFormat;
+        }
+
+
+        public const Int32 ULW_COLORKEY = 0x00000001;
+        public const Int32 ULW_ALPHA = 0x00000002;
+        public const Int32 ULW_OPAQUE = 0x00000004;
+
+        public const byte AC_SRC_OVER = 0x00;
+        public const byte AC_SRC_ALPHA = 0x01;
+
+
+        [DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]
+        public static extern int UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst, ref Point pptDst, ref Size psize, IntPtr hdcSrc, ref Point pprSrc, Int32 crKey, ref BLENDFUNCTION pblend, Int32 dwFlags);
+
+        [DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]
+        public static extern IntPtr GetDC(IntPtr hWnd);
+
+        [DllImport("user32.dll", ExactSpelling = true)]
+        public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);
+
+        [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
+        public static extern IntPtr CreateCompatibleDC(IntPtr hDC);
+
+        [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
+        public static extern int DeleteDC(IntPtr hdc);
+
+        [DllImport("gdi32.dll", ExactSpelling = true)]
+        public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject);
+
+        [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
+        public static extern int DeleteObject(IntPtr hObject);
+    }
+
+
+    public class PerPixelAlphaForm : Form
+    {
+        // http://www.codeproject.com/Articles/1822/Per-Pixel-Alpha-Blend-in-C
+        // Rui Lopes
+
+        public PerPixelAlphaForm()
+        {
+            // This form should not have a border or else Windows will clip it.
+            FormBorderStyle = FormBorderStyle.None;
+        }
+
+        public void SetBitmap(Bitmap bitmap)
+        {
+            SetBitmap(bitmap, 255);
+        }
+
+
+        /// <para>Changes the current bitmap with a custom opacity level.  Here is where all happens!</para>
+        public void SetBitmap(Bitmap bitmap, byte opacity)
+        {
+            if (bitmap.PixelFormat != PixelFormat.Format32bppArgb)
+                throw new ApplicationException("The bitmap must be 32ppp with alpha-channel.");
+
+            // The idea of this is very simple,
+            // 1. Create a compatible DC with screen;
+            // 2. Select the bitmap with 32bpp with alpha-channel in the compatible DC;
+            // 3. Call the UpdateLayeredWindow.
+
+            IntPtr screenDc = Win32.GetDC(IntPtr.Zero);
+            IntPtr memDc = Win32.CreateCompatibleDC(screenDc);
+            IntPtr hBitmap = IntPtr.Zero;
+            IntPtr oldBitmap = IntPtr.Zero;
+
+            try
+            {
+                hBitmap = bitmap.GetHbitmap(Color.FromArgb(0));  // grab a GDI handle from this GDI+ bitmap
+                oldBitmap = Win32.SelectObject(memDc, hBitmap);
+
+                Win32.Size size = new Win32.Size(bitmap.Width, bitmap.Height);
+                Win32.Point pointSource = new Win32.Point(0, 0);
+                Win32.Point topPos = new Win32.Point(Left, Top);
+                Win32.BLENDFUNCTION blend = new Win32.BLENDFUNCTION();
+                blend.BlendOp = Win32.AC_SRC_OVER;
+                blend.BlendFlags = 0;
+                blend.SourceConstantAlpha = opacity;
+                blend.AlphaFormat = Win32.AC_SRC_ALPHA;
+
+                Win32.UpdateLayeredWindow(Handle, screenDc, ref topPos, ref size, memDc, ref pointSource, 0, ref blend, Win32.ULW_ALPHA);
+            }
+            finally
+            {
+                Win32.ReleaseDC(IntPtr.Zero, screenDc);
+                if (hBitmap != IntPtr.Zero)
+                {
+                    Win32.SelectObject(memDc, oldBitmap);
+                    //Windows.DeleteObject(hBitmap); // The documentation says that we have to use the Windows.DeleteObject... but since there is no such method I use the normal DeleteObject from Win32 GDI and it's working fine without any resource leak.
+                    Win32.DeleteObject(hBitmap);
+                }
+                Win32.DeleteDC(memDc);
+            }
+        }
+
+
+        protected override CreateParams CreateParams
+        {
+            get
+            {
+                CreateParams cp = base.CreateParams;
+                cp.ExStyle |= 0x00080000; // This form has to have the WS_EX_LAYERED extended style
+                return cp;
+            }
+        }
+    }
+}

shadowsocks-csharp/shadowsocks-csharp.csproj

@@ -70,22 +70,62 @@
     <Reference Include="System.XML" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="3rd\zxing\BarcodeFormat.cs" />
+    <Compile Include="3rd\zxing\BaseLuminanceSource.cs" />
+    <Compile Include="3rd\zxing\Binarizer.cs" />
+    <Compile Include="3rd\zxing\BinaryBitmap.cs" />
+    <Compile Include="3rd\zxing\BitmapLuminanceSource.cs" />
+    <Compile Include="3rd\zxing\common\BitArray.cs" />
+    <Compile Include="3rd\zxing\common\BitMatrix.cs" />
+    <Compile Include="3rd\zxing\common\BitSource.cs" />
+    <Compile Include="3rd\zxing\common\DecoderResult.cs" />
+    <Compile Include="3rd\zxing\common\DefaultGridSampler.cs" />
+    <Compile Include="3rd\zxing\common\DetectorResult.cs" />
+    <Compile Include="3rd\zxing\common\detector\MathUtils.cs" />
+    <Compile Include="3rd\zxing\common\GlobalHistogramBinarizer.cs" />
+    <Compile Include="3rd\zxing\common\GridSampler.cs" />
+    <Compile Include="3rd\zxing\common\HybridBinarizer.cs" />
+    <Compile Include="3rd\zxing\common\PerspectiveTransform.cs" />
+    <Compile Include="3rd\zxing\common\reedsolomon\GenericGF.cs" />
+    <Compile Include="3rd\zxing\common\reedsolomon\GenericGFPoly.cs" />
+    <Compile Include="3rd\zxing\common\reedsolomon\ReedSolomonDecoder.cs" />
+    <Compile Include="3rd\zxing\common\reedsolomon\ReedSolomonEncoder.cs" />
+    <Compile Include="3rd\zxing\common\StringUtils.cs" />
+    <Compile Include="3rd\zxing\DecodeHintType.cs" />
+    <Compile Include="3rd\zxing\EncodeHintType.cs" />
+    <Compile Include="3rd\zxing\LuminanceSource.cs" />
+    <Compile Include="3rd\zxing\qrcode\decoder\BitMatrixParser.cs" />
+    <Compile Include="3rd\zxing\qrcode\decoder\DataBlock.cs" />
+    <Compile Include="3rd\zxing\qrcode\decoder\DataMask.cs" />
+    <Compile Include="3rd\zxing\qrcode\decoder\DecodedBitStreamParser.cs" />
+    <Compile Include="3rd\zxing\qrcode\decoder\Decoder.cs" />
+    <Compile Include="3rd\zxing\qrcode\decoder\ErrorCorrectionLevel.cs" />
+    <Compile Include="3rd\zxing\qrcode\decoder\FormatInformation.cs" />
+    <Compile Include="3rd\zxing\qrcode\decoder\Mode.cs" />
+    <Compile Include="3rd\zxing\qrcode\decoder\QRCodeDecoderMetaData.cs" />
+    <Compile Include="3rd\zxing\qrcode\decoder\Version.cs" />
+    <Compile Include="3rd\zxing\qrcode\detector\AlignmentPattern.cs" />
+    <Compile Include="3rd\zxing\qrcode\detector\AlignmentPatternFinder.cs" />
+    <Compile Include="3rd\zxing\qrcode\detector\Detector.cs" />
+    <Compile Include="3rd\zxing\qrcode\detector\FinderPattern.cs" />
+    <Compile Include="3rd\zxing\qrcode\detector\FinderPatternFinder.cs" />
+    <Compile Include="3rd\zxing\qrcode\detector\FinderPatternInfo.cs" />
+    <Compile Include="3rd\zxing\qrcode\encoder\BlockPair.cs" />
+    <Compile Include="3rd\zxing\qrcode\encoder\ByteMatrix.cs" />
+    <Compile Include="3rd\zxing\qrcode\encoder\Encoder.cs" />
+    <Compile Include="3rd\zxing\qrcode\encoder\MaskUtil.cs" />
+    <Compile Include="3rd\zxing\qrcode\encoder\MatrixUtil.cs" />
+    <Compile Include="3rd\zxing\qrcode\encoder\QRCode.cs" />
     <Compile Include="3rd\SimpleJson.cs" />
-    <Compile Include="3rd\zxing\BitArray.cs" />
-    <Compile Include="3rd\zxing\BlockPair.cs" />
-    <Compile Include="3rd\zxing\ByteMatrix.cs" />
-    <Compile Include="3rd\zxing\Encoder.cs" />
-    <Compile Include="3rd\zxing\ErrorCorrectionLevel.cs" />
-    <Compile Include="3rd\zxing\GenericGF.cs" />
-    <Compile Include="3rd\zxing\GenericGFPoly.cs" />
-    <Compile Include="3rd\zxing\MaskUtil.cs" />
-    <Compile Include="3rd\zxing\MatrixUtil.cs" />
-    <Compile Include="3rd\zxing\Mode.cs" />
-    <Compile Include="3rd\zxing\QRCode.cs" />
-    <Compile Include="3rd\zxing\ReedSolomonEncoder.cs" />
-    <Compile Include="3rd\zxing\Version.cs" />
+    <Compile Include="3rd\zxing\qrcode\QRCodeReader.cs" />
+    <Compile Include="3rd\zxing\Result.cs" />
+    <Compile Include="3rd\zxing\ResultMetadataType.cs" />
+    <Compile Include="3rd\zxing\ResultPoint.cs" />
+    <Compile Include="3rd\zxing\ResultPointCallback.cs" />
+    <Compile Include="3rd\zxing\WriterException.cs" />
     <Compile Include="Controller\AutoStartup.cs" />
     <Compile Include="Controller\FileManager.cs" />
+    <Compile Include="Controller\GFWListUpdater.cs" />
     <Compile Include="Controller\I18N.cs" />
     <Compile Include="Controller\Logging.cs" />
     <Compile Include="Controller\UpdateChecker.cs" />
@@ -101,6 +141,11 @@
     <Compile Include="Controller\PACServer.cs" />
     <Compile Include="Model\Server.cs" />
     <Compile Include="Model\Configuration.cs" />
+    <Compile Include="Properties\Resources.Designer.cs">
+      <AutoGen>True</AutoGen>
+      <DesignTime>True</DesignTime>
+      <DependentUpon>Resources.resx</DependentUpon>
+    </Compile>
     <Compile Include="Util\Util.cs" />
     <Compile Include="View\ConfigForm.cs">
       <SubType>Form</SubType>
@@ -121,20 +166,18 @@
     <Compile Include="View\QRCodeForm.Designer.cs">
       <DependentUpon>QRCodeForm.cs</DependentUpon>
     </Compile>
+    <Compile Include="View\QRCodeSplashForm.cs">
+      <SubType>Form</SubType>
+    </Compile>
     <EmbeddedResource Include="View\ConfigForm.resx">
       <DependentUpon>ConfigForm.cs</DependentUpon>
       <SubType>Designer</SubType>
     </EmbeddedResource>
     <EmbeddedResource Include="Properties\Resources.resx">
       <Generator>ResXFileCodeGenerator</Generator>
-      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
       <SubType>Designer</SubType>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
     </EmbeddedResource>
-    <Compile Include="Properties\Resources.Designer.cs">
-      <AutoGen>True</AutoGen>
-      <DependentUpon>Resources.resx</DependentUpon>
-      <DesignTime>True</DesignTime>
-    </Compile>
     <EmbeddedResource Include="View\QRCodeForm.resx">
       <DependentUpon>QRCodeForm.cs</DependentUpon>
     </EmbeddedResource>
@@ -142,6 +185,7 @@
     <None Include="app.manifest">
       <SubType>Designer</SubType>
     </None>
+    <None Include="Data\abp.js.gz" />
     <None Include="Data\libsscrypto.dll.gz" />
     <None Include="Data\polipo.exe.gz" />
     <None Include="Data\proxy.pac.txt.gz" />