Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / MS / Internal / Ink / InkSerializedFormat / LZCodec.cs / 1305600 / LZCodec.cs
using MS.Utility; using System; using System.Runtime.InteropServices; using System.Security; using System.Globalization; using System.Windows; using System.Windows.Input; using System.Windows.Ink; using MS.Internal.Ink.InkSerializedFormat; using MS.Internal.Ink; using System.Collections.Generic; using System.Diagnostics; using SR = MS.Internal.PresentationCore.SR; using SRID = MS.Internal.PresentationCore.SRID; namespace MS.Internal.Ink.InkSerializedFormat { ////// LZCodec /// internal class LZCodec { ////// LZCodec /// internal LZCodec() { } ////// Uncompress /// /// /// ///internal byte[] Uncompress(byte[] input, int inputIndex) { //first things first Debug.Assert(input != null); Debug.Assert(input.Length > 1); Debug.Assert(inputIndex < input.Length); Debug.Assert(inputIndex >= 0); List output = new List (); BitStreamWriter writer = new BitStreamWriter(output); BitStreamReader reader = new BitStreamReader(input, inputIndex); //decode int index = 0, countBytes = 0, start = 0; byte byte1 = 0, byte2 = 0; _maxMatchLength = FirstMaxMatchLength; // initialize the ring buffer for (index = 0; index < RingBufferLength - _maxMatchLength; index++) { _ringBuffer[index] = 0; } //initialize decoding globals _flags = 0; _currentRingBufferPosition = RingBufferLength - _maxMatchLength; while (!reader.EndOfStream) { byte1 = reader.ReadByte(Native.BitsPerByte); // High order byte counts the number of bits used in the low order // byte. if (((_flags >>= 1) & 0x100) == 0) { // Set bit mask describing the next 8 bytes. _flags = (((int)byte1) | 0xff00); byte1 = reader.ReadByte(Native.BitsPerByte); } if ((_flags & 1) != 0) { // Just store the literal byte in the buffer. writer.Write(byte1, Native.BitsPerByte); _ringBuffer[_currentRingBufferPosition++] = byte1; _currentRingBufferPosition &= RingBufferLength - 1; } else { // Extract the offset and count to copy from the ring buffer. byte2 = reader.ReadByte(Native.BitsPerByte); countBytes = (int)byte2; start = (countBytes & 0xf0) << 4 | (int)byte1; countBytes = (countBytes & 0x0f) + MaxLiteralLength; for (index = 0; index <= countBytes; index++) { byte1 = _ringBuffer[(start + index) & (RingBufferLength - 1)]; writer.Write(byte1, Native.BitsPerByte); _ringBuffer[_currentRingBufferPosition++] = byte1; _currentRingBufferPosition &= RingBufferLength - 1; } } } return output.ToArray(); } /// /// Privates /// private byte[] _ringBuffer = new byte[RingBufferLength]; private int _maxMatchLength = 0; private int _flags = 0; private int _currentRingBufferPosition = 0; ////// Statics / constants /// private static readonly int FirstMaxMatchLength = 0x10; private static readonly int RingBufferLength = 4069; private static readonly int MaxLiteralLength = 2; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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