Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / IO / Packaging / CompoundFile / CompressionTransform.cs / 1305600 / CompressionTransform.cs
//------------------------------------------------------------------------------ // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // This class implements IDataTransform for the Compression transform. // // History: // 06/04/2002: BruceMac: Initial implementation. // 05/29/2003: LGolding: Ported to WCP tree. // 05/17/2005: BruceMac: Port to Office-compatible block-based format // 05/30/2005: BruceMac: Moved to System.IO.Packaging namespace // 12/14/2005: BruceMac: Moved to MS.Internal.IO.Packaging.CompoundFile namespace // //----------------------------------------------------------------------------- using System; using System.Collections; // for IDictionary using System.IO; // for Stream using System.IO.Packaging; using System.Globalization; // for CultureInfo using System.Windows; // ExceptionStringTable using MS.Internal.IO.Packaging; // CompoundFileEmulationStream using MS.Internal.IO.Packaging.CompoundFile; //using System.Windows; namespace MS.Internal.IO.Packaging.CompoundFile { ////// CompressionTransform for use in Compound File DataSpaces /// internal class CompressionTransform : IDataTransform { #region IDataTransform ////// Transform readiness /// public bool IsReady { get { return true; } } ////// No configuration parameters for this transform /// public bool FixedSettings { get { return true; } } ////// Returns the type name identifier string. /// public object TransformIdentifier { get { return CompressionTransform.ClassTransformIdentifier; } } ////// Expose the transform identifier for the use of the DataSpaceManager. /// internal static string ClassTransformIdentifier { get { return "{86DE7F2B-DDCE-486d-B016-405BBE82B8BC}"; } } //----------------------------------------------------- // // Public Methods // //----------------------------------------------------- ////// Given output stream returns stream for encoding/decoding /// /// the encoded stream that this transform acts on /// Dictionary object used to store any additional context information ///the stream that implements the transform ////// This method is used only by the DataSpaceManager, so we declare it as an explicit /// interface implementation to hide it from the public interface. /// Stream IDataTransform.GetTransformedStream( Stream encodedStream, IDictionary transformContext ) { Stream tempStream = new SparseMemoryStream(_lowWaterMark, _highWaterMark); tempStream = new CompressEmulationStream(encodedStream, tempStream, 0, new CompoundFileDeflateTransform()); // return a VersionedStream that works with the VersionedStreamOwner // to verify/update our FormatVersion info return new VersionedStream(tempStream, _versionedStreamOwner); } #endregion ////// constructor /// /// environment ///this should only be used by the DataSpaceManager class public CompressionTransform(TransformEnvironment myEnvironment) { _transformEnvironment = myEnvironment; // Create a wrapper that manages persistence and comparison of FormatVersion // in our InstanceData stream. We can read/write to this stream as needed (though CompressionTransform // does not because we don't house any non-FormatVersion data in the instance data stream). // We need to give out our current code version so it can compare with any file version as appropriate. _versionedStreamOwner = new VersionedStreamOwner( _transformEnvironment.GetPrimaryInstanceData(), new FormatVersion(_featureName, _minimumReaderVersion, _minimumUpdaterVersion, _currentFeatureVersion)); } //------------------------------------------------------ // // Private Data // //----------------------------------------------------- private TransformEnvironment _transformEnvironment; private VersionedStreamOwner _versionedStreamOwner; // our instance data stream wrapped private static readonly string _featureName = "Microsoft.Metadata.CompressionTransform"; private static readonly VersionPair _currentFeatureVersion = new VersionPair(1, 0); private static readonly VersionPair _minimumReaderVersion = new VersionPair(1, 0); private static readonly VersionPair _minimumUpdaterVersion = new VersionPair(1, 0); private const long _lowWaterMark = 0x19000; // we definitely would like to keep everything under 100 KB in memory private const long _highWaterMark = 0xA00000; // we would like to keep everything over 10 MB on disk } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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