Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Base / MS / Internal / IO / Packaging / DeflateEmulationStream.cs / 1 / DeflateEmulationStream.cs
//------------------------------------------------------------------------------ // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // Implementation of a helper class that provides a fully functional Stream on a restricted functionality // Compression stream (System.IO.Compression.DeflateStream). // // History: // 10/05/2005: BruceMac: Split out from CompressEmulationStream //----------------------------------------------------------------------------- using System; using System.IO; using System.IO.Compression; // for DeflateStream using System.Diagnostics; using System.IO.Packaging; using System.Windows; namespace MS.Internal.IO.Packaging { //----------------------------------------------------- // // Internal Members // //----------------------------------------------------- ////// Emulates a fully functional stream using restricted functionality DeflateStream /// internal class DeflateEmulationTransform : IDeflateTransform { ////// Extract from DeflateStream to temp stream /// ///Caller is responsible for correctly positioning source and sink stream pointers before calling. public void Decompress(Stream source, Stream sink) { // for non-empty stream create deflate stream that can // actually decompress using (DeflateStream deflateStream = new DeflateStream( source, // source of compressed data CompressionMode.Decompress, // compress or decompress true)) // leave base stream open when the deflate stream is closed { int bytesRead = 0; do { bytesRead = deflateStream.Read(Buffer, 0, Buffer.Length); if (bytesRead > 0) sink.Write(Buffer, 0, bytesRead); } while (bytesRead > 0); } } ////// Compress from the temp stream into the base stream /// ///Caller is responsible for correctly positioning source and sink stream pointers before calling. public void Compress(Stream source, Stream sink) { // create deflate stream that can actually compress or decompress using (DeflateStream deflateStream = new DeflateStream( sink, // destination for compressed data CompressionMode.Compress, // compress or decompress true)) // leave base stream open when the deflate stream is closed { // persist to deflated stream from working stream int bytesRead = 0; do { bytesRead = source.Read(Buffer, 0, Buffer.Length); if (bytesRead > 0) deflateStream.Write(Buffer, 0, bytesRead); } while (bytesRead > 0); } // truncate if necessary and possible if (sink.CanSeek) sink.SetLength(sink.Position); } //------------------------------------------------------ // // Private Properties // //----------------------------------------------------- private byte[] Buffer { get { if (_buffer == null) _buffer = new byte[0x1000]; // 4k return _buffer; } } //------------------------------------------------------ // // Private Members // //------------------------------------------------------ private byte[] _buffer; // alloc and re-use to reduce memory fragmentation // this is safe because we are not thread-safe } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. //------------------------------------------------------------------------------ // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // Implementation of a helper class that provides a fully functional Stream on a restricted functionality // Compression stream (System.IO.Compression.DeflateStream). // // History: // 10/05/2005: BruceMac: Split out from CompressEmulationStream //----------------------------------------------------------------------------- using System; using System.IO; using System.IO.Compression; // for DeflateStream using System.Diagnostics; using System.IO.Packaging; using System.Windows; namespace MS.Internal.IO.Packaging { //----------------------------------------------------- // // Internal Members // //----------------------------------------------------- ////// Emulates a fully functional stream using restricted functionality DeflateStream /// internal class DeflateEmulationTransform : IDeflateTransform { ////// Extract from DeflateStream to temp stream /// ///Caller is responsible for correctly positioning source and sink stream pointers before calling. public void Decompress(Stream source, Stream sink) { // for non-empty stream create deflate stream that can // actually decompress using (DeflateStream deflateStream = new DeflateStream( source, // source of compressed data CompressionMode.Decompress, // compress or decompress true)) // leave base stream open when the deflate stream is closed { int bytesRead = 0; do { bytesRead = deflateStream.Read(Buffer, 0, Buffer.Length); if (bytesRead > 0) sink.Write(Buffer, 0, bytesRead); } while (bytesRead > 0); } } ////// Compress from the temp stream into the base stream /// ///Caller is responsible for correctly positioning source and sink stream pointers before calling. public void Compress(Stream source, Stream sink) { // create deflate stream that can actually compress or decompress using (DeflateStream deflateStream = new DeflateStream( sink, // destination for compressed data CompressionMode.Compress, // compress or decompress true)) // leave base stream open when the deflate stream is closed { // persist to deflated stream from working stream int bytesRead = 0; do { bytesRead = source.Read(Buffer, 0, Buffer.Length); if (bytesRead > 0) deflateStream.Write(Buffer, 0, bytesRead); } while (bytesRead > 0); } // truncate if necessary and possible if (sink.CanSeek) sink.SetLength(sink.Position); } //------------------------------------------------------ // // Private Properties // //----------------------------------------------------- private byte[] Buffer { get { if (_buffer == null) _buffer = new byte[0x1000]; // 4k return _buffer; } } //------------------------------------------------------ // // Private Members // //------------------------------------------------------ private byte[] _buffer; // alloc and re-use to reduce memory fragmentation // this is safe because we are not thread-safe } } // 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
- CompareValidator.cs
- RegexFCD.cs
- _TimerThread.cs
- ThreadStartException.cs
- JavascriptCallbackMessageInspector.cs
- FontFaceLayoutInfo.cs
- xmlfixedPageInfo.cs
- ProcessHostConfigUtils.cs
- XmlReflectionImporter.cs
- Cursors.cs
- RijndaelManaged.cs
- CriticalExceptions.cs
- LayoutEngine.cs
- TypeBuilder.cs
- DataColumnCollection.cs
- SqlConnectionManager.cs
- InputProviderSite.cs
- SqlConnectionPoolGroupProviderInfo.cs
- CqlLexerHelpers.cs
- HttpException.cs
- Region.cs
- TextRangeAdaptor.cs
- MailWriter.cs
- FixUp.cs
- RedirectionProxy.cs
- NetworkStream.cs
- WebPartAddingEventArgs.cs
- Constraint.cs
- PageContentCollection.cs
- CompositeScriptReferenceEventArgs.cs
- DataGridGeneralPage.cs
- DateTimeOffsetStorage.cs
- ChineseLunisolarCalendar.cs
- XmlSchemaInferenceException.cs
- LambdaCompiler.Address.cs
- PinProtectionHelper.cs
- Encoding.cs
- SpecialNameAttribute.cs
- SiteMapNodeItem.cs
- EventMap.cs
- NavigationWindow.cs
- RangeContentEnumerator.cs
- RequestCache.cs
- ToolBar.cs
- ClientSponsor.cs
- CodeAttributeDeclaration.cs
- AQNBuilder.cs
- MultipartContentParser.cs
- MimePart.cs
- DataSourceXmlClassAttribute.cs
- FieldBuilder.cs
- IndexerHelper.cs
- Process.cs
- ConnectionPoolManager.cs
- CodeTypeMemberCollection.cs
- TraversalRequest.cs
- XmlSchemaSearchPattern.cs
- BulletChrome.cs
- IdentifierCollection.cs
- SelectorAutomationPeer.cs
- WindowsRichEditRange.cs
- SqlStatistics.cs
- WMICapabilities.cs
- DiscoveryMessageProperty.cs
- Condition.cs
- COSERVERINFO.cs
- OSFeature.cs
- DropDownList.cs
- TextElementEditingBehaviorAttribute.cs
- ActiveDocumentEvent.cs
- SafeRightsManagementPubHandle.cs
- Ipv6Element.cs
- ZipIOCentralDirectoryFileHeader.cs
- XmlSchemaRedefine.cs
- TextElementEnumerator.cs
- ListViewInsertedEventArgs.cs
- DbProviderConfigurationHandler.cs
- ViewBox.cs
- SelectedGridItemChangedEvent.cs
- HtmlLink.cs
- DesignSurfaceCollection.cs
- ExtensionCollection.cs
- _NativeSSPI.cs
- CodeTypeDeclaration.cs
- DbConnectionStringCommon.cs
- WorkflowInstanceAbortedRecord.cs
- Repeater.cs
- TreeViewEvent.cs
- ServiceObjectContainer.cs
- DecodeHelper.cs
- DBConnection.cs
- Rfc4050KeyFormatter.cs
- LayoutExceptionEventArgs.cs
- GenerateHelper.cs
- WorkflowControlClient.cs
- RadioButtonFlatAdapter.cs
- ParameterBuilder.cs
- ListSortDescription.cs
- IMembershipProvider.cs
- RuntimeConfigLKG.cs