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
- Highlights.cs
- SourceSwitch.cs
- ControlLocalizer.cs
- LiteralTextContainerControlBuilder.cs
- PersonalizationState.cs
- TriggerBase.cs
- PeerUnsafeNativeMethods.cs
- AssemblyHelper.cs
- PropertyGroupDescription.cs
- ItemCollectionEditor.cs
- PhonemeConverter.cs
- XmlSiteMapProvider.cs
- RC2.cs
- ClientUtils.cs
- XmlSerializableReader.cs
- DataGridViewMethods.cs
- FlowDocumentPageViewerAutomationPeer.cs
- FlowLayoutSettings.cs
- File.cs
- xmlglyphRunInfo.cs
- SiblingIterators.cs
- EntitySetBaseCollection.cs
- TreeWalker.cs
- CompilerError.cs
- TextEditorSpelling.cs
- Table.cs
- _ListenerRequestStream.cs
- MouseButton.cs
- MiniConstructorInfo.cs
- NegationPusher.cs
- DataRecord.cs
- LineVisual.cs
- BinaryObjectReader.cs
- StringValueSerializer.cs
- WindowsBrush.cs
- ConfigurationSchemaErrors.cs
- Exceptions.cs
- _SslState.cs
- TdsParser.cs
- LocalizationParserHooks.cs
- Control.cs
- DataListItemEventArgs.cs
- XmlMessageFormatter.cs
- BitmapEffectOutputConnector.cs
- ForceCopyBuildProvider.cs
- BoolExpressionVisitors.cs
- ChangeTracker.cs
- ToolStripSplitStackLayout.cs
- XmlImplementation.cs
- GlyphsSerializer.cs
- ListViewDesigner.cs
- ExtendedPropertyDescriptor.cs
- WebPartTracker.cs
- SqlProcedureAttribute.cs
- UntypedNullExpression.cs
- ProjectionPruner.cs
- NameValueSectionHandler.cs
- CompressionTransform.cs
- WindowPatternIdentifiers.cs
- CodeNamespaceCollection.cs
- DoubleAnimationClockResource.cs
- StreamWriter.cs
- FragmentQuery.cs
- EventListenerClientSide.cs
- CorrelationToken.cs
- OdbcPermission.cs
- AsyncCompletedEventArgs.cs
- DrawListViewColumnHeaderEventArgs.cs
- TypeUnloadedException.cs
- CheckedListBox.cs
- _DigestClient.cs
- WebBrowserNavigatingEventHandler.cs
- Error.cs
- ListViewSortEventArgs.cs
- RuntimeCompatibilityAttribute.cs
- AssemblyResourceLoader.cs
- Clipboard.cs
- DesignTimeResourceProviderFactoryAttribute.cs
- StringFunctions.cs
- ComboBoxItem.cs
- Calendar.cs
- BuildResult.cs
- DiagnosticTrace.cs
- DataReaderContainer.cs
- ButtonAutomationPeer.cs
- Int32AnimationUsingKeyFrames.cs
- Ipv6Element.cs
- TextBox.cs
- RepeaterItemCollection.cs
- ADMembershipProvider.cs
- ZeroOpNode.cs
- BindingGroup.cs
- SystemKeyConverter.cs
- AddressingVersion.cs
- ExpressionVisitor.cs
- NameObjectCollectionBase.cs
- DataObjectPastingEventArgs.cs
- AppearanceEditorPart.cs
- Variant.cs
- ActivityDesignerResources.cs