Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / wpf / src / Base / MS / Internal / IO / Packaging / CompoundFile / VersionedStream.cs / 1 / VersionedStream.cs
//------------------------------------------------------------------------------ // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // This class provides file versioning support for streams provided by // IDataTransform implementations. // // History: // 02/21/2006: BruceMac: Initial implementation. // //----------------------------------------------------------------------------- using System; using System.IO; // for Stream using System.Windows; // ExceptionStringTable using System.Globalization; // for CultureInfo namespace MS.Internal.IO.Packaging.CompoundFile { ////// Maintains a FormatVersion for this stream and any number of sibling streams that semantically /// share the same version information (which is only persisted in one of the streams). /// internal class VersionedStream : Stream { //----------------------------------------------------- // // Public Methods // //----------------------------------------------------- #region Stream Methods ////// Return the bytes requested from the container /// public override int Read(byte[] buffer, int offset, int count) { CheckDisposed(); // ReadAttempt accepts an optional boolean. If this is true, that means // we are expecting a legal FormatVersion to exist and that it is readable by our // code version. We do not want to force this check if we are empty. _versionOwner.ReadAttempt(_stream.Length > 0); return _stream.Read(buffer, offset, count); } ////// Write /// public override void Write(byte[] buffer, int offset, int count) { CheckDisposed(); _versionOwner.WriteAttempt(); _stream.Write(buffer, offset, count); } ////// ReadByte /// public override int ReadByte() { CheckDisposed(); // ReadAttempt accepts an optional boolean. If this is true, that means // we are expecting a legal FormatVersion to exist and that it is readable by our // code version. We do not want to force this check if we are empty. _versionOwner.ReadAttempt(_stream.Length > 0); return _stream.ReadByte(); } ////// WriteByte /// public override void WriteByte(byte b) { CheckDisposed(); _versionOwner.WriteAttempt(); _stream.WriteByte(b); } ////// Seek /// /// offset /// origin ///zero public override long Seek(long offset, SeekOrigin origin) { CheckDisposed(); return _stream.Seek(offset, origin); } ////// SetLength /// public override void SetLength(long newLength) { CheckDisposed(); if (newLength < 0) throw new ArgumentOutOfRangeException("newLength"); _versionOwner.WriteAttempt(); _stream.SetLength(newLength); } ////// Flush /// public override void Flush() { CheckDisposed(); _stream.Flush(); } #endregion Stream Methods //------------------------------------------------------ // // Public Properties // //----------------------------------------------------- #region Stream Properties ////// Current logical position within the stream /// public override long Position { get { CheckDisposed(); return _stream.Position; } set { Seek(value, SeekOrigin.Begin); } } ////// Length /// public override long Length { get { CheckDisposed(); return _stream.Length; } } ////// Is stream readable? /// ///returns false when called on disposed stream public override bool CanRead { get { return (_stream != null) && _stream.CanRead && _versionOwner.IsReadable; } } ////// Is stream seekable - should be handled by our owner /// ///returns false when called on disposed stream public override bool CanSeek { get { return (_stream != null) && _stream.CanSeek && _versionOwner.IsReadable; } } ////// Is stream writeable? /// ///returns false when called on disposed stream public override bool CanWrite { get { return (_stream != null) && _stream.CanWrite && _versionOwner.IsUpdatable; } } #endregion //------------------------------------------------------ // // Internal Methods // //------------------------------------------------------ ////// Constructor to use for any stream that shares versioning information with another stream /// but is not the one that houses the FormatVersion data itself. /// /// /// internal VersionedStream(Stream baseStream, VersionedStreamOwner versionOwner) { if (baseStream == null) throw new ArgumentNullException("baseStream"); if (versionOwner == null) throw new ArgumentNullException("versionOwner"); _stream = baseStream; _versionOwner = versionOwner; } //----------------------------------------------------- // // Protected Methods // //------------------------------------------------------ ////// Constructor for use by our subclass VersionedStreamOwner. /// /// protected VersionedStream(Stream baseStream) { if (baseStream == null) throw new ArgumentNullException("baseStream"); _stream = baseStream; // we are actually a VersionedStreamOwner _versionOwner = (VersionedStreamOwner)this; } ////// Sometimes our subclass needs to read/write directly to the stream /// ///Don't use CheckDisposed() here as we need to return null if we are disposed protected Stream BaseStream { get { return _stream; } } ////// Dispose(bool) /// /// protected override void Dispose(bool disposing) { try { if (disposing && (_stream != null)) { _stream.Close(); } } finally { _stream = null; base.Dispose(disposing); } } ////// Call this before accepting any public API call (except some Stream calls that /// are allowed to respond even when Closed /// protected void CheckDisposed() { if (_stream == null) throw new ObjectDisposedException(null, SR.Get(SRID.StreamObjectDisposed)); } //----------------------------------------------------- // // Private Fields // //----------------------------------------------------- private VersionedStreamOwner _versionOwner; private Stream _stream; // null indicates Disposed state } } // 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: // This class provides file versioning support for streams provided by // IDataTransform implementations. // // History: // 02/21/2006: BruceMac: Initial implementation. // //----------------------------------------------------------------------------- using System; using System.IO; // for Stream using System.Windows; // ExceptionStringTable using System.Globalization; // for CultureInfo namespace MS.Internal.IO.Packaging.CompoundFile { ////// Maintains a FormatVersion for this stream and any number of sibling streams that semantically /// share the same version information (which is only persisted in one of the streams). /// internal class VersionedStream : Stream { //----------------------------------------------------- // // Public Methods // //----------------------------------------------------- #region Stream Methods ////// Return the bytes requested from the container /// public override int Read(byte[] buffer, int offset, int count) { CheckDisposed(); // ReadAttempt accepts an optional boolean. If this is true, that means // we are expecting a legal FormatVersion to exist and that it is readable by our // code version. We do not want to force this check if we are empty. _versionOwner.ReadAttempt(_stream.Length > 0); return _stream.Read(buffer, offset, count); } ////// Write /// public override void Write(byte[] buffer, int offset, int count) { CheckDisposed(); _versionOwner.WriteAttempt(); _stream.Write(buffer, offset, count); } ////// ReadByte /// public override int ReadByte() { CheckDisposed(); // ReadAttempt accepts an optional boolean. If this is true, that means // we are expecting a legal FormatVersion to exist and that it is readable by our // code version. We do not want to force this check if we are empty. _versionOwner.ReadAttempt(_stream.Length > 0); return _stream.ReadByte(); } ////// WriteByte /// public override void WriteByte(byte b) { CheckDisposed(); _versionOwner.WriteAttempt(); _stream.WriteByte(b); } ////// Seek /// /// offset /// origin ///zero public override long Seek(long offset, SeekOrigin origin) { CheckDisposed(); return _stream.Seek(offset, origin); } ////// SetLength /// public override void SetLength(long newLength) { CheckDisposed(); if (newLength < 0) throw new ArgumentOutOfRangeException("newLength"); _versionOwner.WriteAttempt(); _stream.SetLength(newLength); } ////// Flush /// public override void Flush() { CheckDisposed(); _stream.Flush(); } #endregion Stream Methods //------------------------------------------------------ // // Public Properties // //----------------------------------------------------- #region Stream Properties ////// Current logical position within the stream /// public override long Position { get { CheckDisposed(); return _stream.Position; } set { Seek(value, SeekOrigin.Begin); } } ////// Length /// public override long Length { get { CheckDisposed(); return _stream.Length; } } ////// Is stream readable? /// ///returns false when called on disposed stream public override bool CanRead { get { return (_stream != null) && _stream.CanRead && _versionOwner.IsReadable; } } ////// Is stream seekable - should be handled by our owner /// ///returns false when called on disposed stream public override bool CanSeek { get { return (_stream != null) && _stream.CanSeek && _versionOwner.IsReadable; } } ////// Is stream writeable? /// ///returns false when called on disposed stream public override bool CanWrite { get { return (_stream != null) && _stream.CanWrite && _versionOwner.IsUpdatable; } } #endregion //------------------------------------------------------ // // Internal Methods // //------------------------------------------------------ ////// Constructor to use for any stream that shares versioning information with another stream /// but is not the one that houses the FormatVersion data itself. /// /// /// internal VersionedStream(Stream baseStream, VersionedStreamOwner versionOwner) { if (baseStream == null) throw new ArgumentNullException("baseStream"); if (versionOwner == null) throw new ArgumentNullException("versionOwner"); _stream = baseStream; _versionOwner = versionOwner; } //----------------------------------------------------- // // Protected Methods // //------------------------------------------------------ ////// Constructor for use by our subclass VersionedStreamOwner. /// /// protected VersionedStream(Stream baseStream) { if (baseStream == null) throw new ArgumentNullException("baseStream"); _stream = baseStream; // we are actually a VersionedStreamOwner _versionOwner = (VersionedStreamOwner)this; } ////// Sometimes our subclass needs to read/write directly to the stream /// ///Don't use CheckDisposed() here as we need to return null if we are disposed protected Stream BaseStream { get { return _stream; } } ////// Dispose(bool) /// /// protected override void Dispose(bool disposing) { try { if (disposing && (_stream != null)) { _stream.Close(); } } finally { _stream = null; base.Dispose(disposing); } } ////// Call this before accepting any public API call (except some Stream calls that /// are allowed to respond even when Closed /// protected void CheckDisposed() { if (_stream == null) throw new ObjectDisposedException(null, SR.Get(SRID.StreamObjectDisposed)); } //----------------------------------------------------- // // Private Fields // //----------------------------------------------------- private VersionedStreamOwner _versionOwner; private Stream _stream; // null indicates Disposed state } } // 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
- ProviderCommandInfoUtils.cs
- MouseButton.cs
- ObjectSet.cs
- FileVersionInfo.cs
- Popup.cs
- TransformCollection.cs
- DataGridViewRowPrePaintEventArgs.cs
- VectorAnimation.cs
- CookieParameter.cs
- AddressHeaderCollectionElement.cs
- TableLayoutPanelCellPosition.cs
- safelink.cs
- _NetRes.cs
- WebBrowserHelper.cs
- TagPrefixInfo.cs
- keycontainerpermission.cs
- CacheOutputQuery.cs
- UInt16Converter.cs
- followingquery.cs
- LoginCancelEventArgs.cs
- ReadOnlyMetadataCollection.cs
- CmsInterop.cs
- Annotation.cs
- ObjectTypeMapping.cs
- DuplexChannelFactory.cs
- RayHitTestParameters.cs
- EntityDataSourceDesigner.cs
- KnownColorTable.cs
- InvokeProviderWrapper.cs
- PersonalizationProviderHelper.cs
- RepeaterItemCollection.cs
- DefaultObjectMappingItemCollection.cs
- XmlSchemaExternal.cs
- XmlObjectSerializer.cs
- SecurityAlgorithmSuite.cs
- ImageCollectionEditor.cs
- DataGridViewCellMouseEventArgs.cs
- JoinSymbol.cs
- ComEventsInfo.cs
- MemoryFailPoint.cs
- IteratorDescriptor.cs
- BypassElement.cs
- HttpRequest.cs
- XPathAncestorIterator.cs
- NetworkStream.cs
- HierarchicalDataSourceDesigner.cs
- IssuanceLicense.cs
- JulianCalendar.cs
- BamlResourceContent.cs
- ActivityCodeDomSerializer.cs
- DataGridViewAutoSizeModeEventArgs.cs
- DisplayNameAttribute.cs
- ResetableIterator.cs
- BooleanToVisibilityConverter.cs
- ActiveXHelper.cs
- HandlerBase.cs
- DataGridViewSelectedCellsAccessibleObject.cs
- FormViewCommandEventArgs.cs
- SchemaComplexType.cs
- CachedFontFamily.cs
- WindowHideOrCloseTracker.cs
- SignedInfo.cs
- VirtualDirectoryMapping.cs
- GridViewSortEventArgs.cs
- OutOfMemoryException.cs
- InputBindingCollection.cs
- HttpFormatExtensions.cs
- ViewBox.cs
- SqlProcedureAttribute.cs
- SkewTransform.cs
- ToolStripComboBox.cs
- CommonXSendMessage.cs
- StreamSecurityUpgradeAcceptorAsyncResult.cs
- ThicknessAnimationBase.cs
- XmlProcessingInstruction.cs
- ToolStripGrip.cs
- LinkUtilities.cs
- Parallel.cs
- SqlBulkCopyColumnMappingCollection.cs
- TemplateAction.cs
- CacheMemory.cs
- RuleAction.cs
- XmlSchemaSubstitutionGroup.cs
- DrawingDrawingContext.cs
- PassportAuthenticationModule.cs
- ExtractorMetadata.cs
- ElementsClipboardData.cs
- CopyNodeSetAction.cs
- Polygon.cs
- UrlMappingsSection.cs
- HttpCacheVaryByContentEncodings.cs
- ToolStripSplitStackLayout.cs
- OutKeywords.cs
- IPGlobalProperties.cs
- ProgressBarBrushConverter.cs
- SortDescription.cs
- ZipIOCentralDirectoryBlock.cs
- DataTableTypeConverter.cs
- QualifiedCellIdBoolean.cs
- Variant.cs