Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / wpf / src / Core / CSharp / MS / Internal / Ink / InkSerializedFormat / LZCodec.cs / 1 / 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. 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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- CodeSnippetCompileUnit.cs
- DecoratedNameAttribute.cs
- BasicCellRelation.cs
- PrintDocument.cs
- EncoderFallback.cs
- FontFaceLayoutInfo.cs
- CompositeControl.cs
- ObjectStateFormatter.cs
- HttpValueCollection.cs
- TdsParserStateObject.cs
- WindowsGrip.cs
- UpdateTracker.cs
- VersionConverter.cs
- Button.cs
- ListViewContainer.cs
- RuleAttributes.cs
- ApplicationDirectory.cs
- EntityDataSourceMemberPath.cs
- ControlParameter.cs
- EntityObject.cs
- QilDataSource.cs
- XmlSchemaComplexType.cs
- SimpleWorkerRequest.cs
- IISUnsafeMethods.cs
- DataObjectMethodAttribute.cs
- WindowsNonControl.cs
- DBSchemaTable.cs
- KeyProperty.cs
- EventListener.cs
- ObjectViewEntityCollectionData.cs
- HttpApplication.cs
- CultureSpecificCharacterBufferRange.cs
- InvokeMethodActivity.cs
- CfgParser.cs
- Margins.cs
- ProcessHost.cs
- MobileErrorInfo.cs
- DocumentGridContextMenu.cs
- CompositeKey.cs
- ModelTreeEnumerator.cs
- TypeBuilderInstantiation.cs
- ParserOptions.cs
- BinaryCommonClasses.cs
- RawMouseInputReport.cs
- PathGeometry.cs
- ObjectStateEntryDbUpdatableDataRecord.cs
- HttpVersion.cs
- WindowsContainer.cs
- _ConnectOverlappedAsyncResult.cs
- EnvironmentPermission.cs
- NumberEdit.cs
- ViewGenResults.cs
- ConfigurationElementProperty.cs
- CodeLinePragma.cs
- NamespaceList.cs
- EntitySet.cs
- HandlerFactoryWrapper.cs
- LiteralControl.cs
- XmlDataSource.cs
- XmlSchemaCompilationSettings.cs
- DataGridTableCollection.cs
- RuntimeIdentifierPropertyAttribute.cs
- RowBinding.cs
- DataKey.cs
- FormCollection.cs
- SQLStringStorage.cs
- SharedPerformanceCounter.cs
- ZipIOExtraField.cs
- DSASignatureDeformatter.cs
- ItemsChangedEventArgs.cs
- SecurityDocument.cs
- PathBox.cs
- DictionaryGlobals.cs
- ReceiveContextCollection.cs
- ChannelManager.cs
- ZipPackage.cs
- BindableAttribute.cs
- HeaderCollection.cs
- PersonalizationAdministration.cs
- RequestQueue.cs
- ReferencedCollectionType.cs
- Dictionary.cs
- webbrowsersite.cs
- IMembershipProvider.cs
- RelationshipType.cs
- ShaderEffect.cs
- Select.cs
- FontSource.cs
- MultiDataTrigger.cs
- ToolStripPanel.cs
- WmpBitmapEncoder.cs
- WmlImageAdapter.cs
- FontEmbeddingManager.cs
- EventToken.cs
- AxParameterData.cs
- BamlTreeNode.cs
- ControllableStoryboardAction.cs
- DebugHandleTracker.cs
- DynamicILGenerator.cs
- CodeRegionDirective.cs