Code:
/ 4.0 / 4.0 / 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. 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
- RegexTree.cs
- WindowsStreamSecurityBindingElement.cs
- CustomSignedXml.cs
- InstanceOwnerQueryResult.cs
- SrgsRulesCollection.cs
- Debug.cs
- SamlAction.cs
- CapabilitiesRule.cs
- DataSourceCacheDurationConverter.cs
- SqlErrorCollection.cs
- KeyInterop.cs
- DelegatedStream.cs
- Win32Exception.cs
- ComponentConverter.cs
- InvokeCompletedEventArgs.cs
- SchemaCollectionCompiler.cs
- WindowShowOrOpenTracker.cs
- InitiatorSessionSymmetricMessageSecurityProtocol.cs
- SplitterPanel.cs
- TdsRecordBufferSetter.cs
- TextRangeSerialization.cs
- OdbcParameterCollection.cs
- SizeAnimation.cs
- MenuItemCollection.cs
- DataGridCommandEventArgs.cs
- DetailsView.cs
- SplashScreen.cs
- InputMethodStateTypeInfo.cs
- BaseCodePageEncoding.cs
- XsdCachingReader.cs
- DataTableReader.cs
- objectquery_tresulttype.cs
- manifestimages.cs
- SmtpLoginAuthenticationModule.cs
- ToolStripScrollButton.cs
- XmlRawWriter.cs
- XmlSchemaSimpleTypeRestriction.cs
- List.cs
- ClickablePoint.cs
- cookie.cs
- ProcessingInstructionAction.cs
- PageThemeParser.cs
- TableAdapterManagerHelper.cs
- TextEditorContextMenu.cs
- PrtTicket_Editor.cs
- ChooseAction.cs
- ListBindableAttribute.cs
- InternalTypeHelper.cs
- ToolStripPanelCell.cs
- XmlSchemaImport.cs
- SmiXetterAccessMap.cs
- BufferedWebEventProvider.cs
- CqlIdentifiers.cs
- MetadataArtifactLoaderComposite.cs
- EpmAttributeNameBuilder.cs
- BaseTreeIterator.cs
- AgileSafeNativeMemoryHandle.cs
- TypefaceCollection.cs
- bidPrivateBase.cs
- ScrollBar.cs
- Exception.cs
- LinqDataSourceDeleteEventArgs.cs
- _IPv4Address.cs
- SystemGatewayIPAddressInformation.cs
- ExceptionUtil.cs
- UIElementParagraph.cs
- ContentPropertyAttribute.cs
- ApplicationInfo.cs
- CustomAttributeSerializer.cs
- SchemaImporter.cs
- login.cs
- SqlProfileProvider.cs
- ClientBuildManagerCallback.cs
- SymbolTable.cs
- EventSinkHelperWriter.cs
- RowType.cs
- StylusPointPropertyUnit.cs
- IndentedWriter.cs
- TileModeValidation.cs
- XmlSchemaComplexContentExtension.cs
- DoubleAverageAggregationOperator.cs
- GridItemCollection.cs
- XamlLoadErrorInfo.cs
- TransactionScope.cs
- DataSourceControlBuilder.cs
- SpeakCompletedEventArgs.cs
- InfoCardRSAPKCS1KeyExchangeFormatter.cs
- ObjectIDGenerator.cs
- DragCompletedEventArgs.cs
- Schema.cs
- EventToken.cs
- ObjectNotFoundException.cs
- TraceEventCache.cs
- TextBoxRenderer.cs
- XmlSchemaElement.cs
- isolationinterop.cs
- ViewCellSlot.cs
- ParsedAttributeCollection.cs
- StringOutput.cs
- XPathDocumentNavigator.cs