Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / fx / src / Xml / System / Xml / Core / ReadContentAsBinaryHelper.cs / 1 / ReadContentAsBinaryHelper.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- using System.Diagnostics; namespace System.Xml { internal class ReadContentAsBinaryHelper { // Private enums enum State { None, InReadContent, InReadElementContent, } // Fields XmlReader reader; State state; int valueOffset; bool isEnd; bool canReadValueChunk; char[] valueChunk; int valueChunkLength; IncrementalReadDecoder decoder; Base64Decoder base64Decoder; BinHexDecoder binHexDecoder; // Constants const int ChunkSize = 256; // Constructor internal ReadContentAsBinaryHelper( XmlReader reader ) { this.reader = reader; this.canReadValueChunk = reader.CanReadValueChunk; if ( canReadValueChunk ) { valueChunk = new char[ChunkSize]; } } // Static methods internal static ReadContentAsBinaryHelper CreateOrReset( ReadContentAsBinaryHelper helper, XmlReader reader ) { if ( helper == null ) { return new ReadContentAsBinaryHelper( reader ); } else { helper.Reset(); return helper; } } // Internal methods internal int ReadContentAsBase64( byte[] buffer, int index, int count ) { // check arguments if ( buffer == null ) { throw new ArgumentNullException( "buffer" ); } if ( count < 0 ) { throw new ArgumentOutOfRangeException( "count" ); } if ( index < 0 ) { throw new ArgumentOutOfRangeException( "index" ); } if ( buffer.Length - index < count ) { throw new ArgumentOutOfRangeException( "count" ); } switch ( state ) { case State.None: if ( !reader.CanReadContentAs() ) { throw reader.CreateReadContentAsException( "ReadContentAsBase64" ); } if ( !Init() ) { return 0; } break; case State.InReadContent: // if we have a correct decoder, go read if ( decoder == base64Decoder ) { // read more binary data return ReadContentAsBinary( buffer, index, count ); } break; case State.InReadElementContent: throw new InvalidOperationException( Res.GetString( Res.Xml_MixingBinaryContentMethods ) ); default: Debug.Assert( false ); return 0; } Debug.Assert( state == State.InReadContent ); // setup base64 decoder InitBase64Decoder(); // read more binary data return ReadContentAsBinary( buffer, index, count ); } internal int ReadContentAsBinHex( byte[] buffer, int index, int count ) { // check arguments if ( buffer == null ) { throw new ArgumentNullException( "buffer" ); } if ( count < 0 ) { throw new ArgumentOutOfRangeException( "count" ); } if ( index < 0 ) { throw new ArgumentOutOfRangeException( "index" ); } if ( buffer.Length - index < count ) { throw new ArgumentOutOfRangeException( "count" ); } switch ( state ) { case State.None: if ( !reader.CanReadContentAs() ) { throw reader.CreateReadContentAsException( "ReadContentAsBinHex" ); } if ( !Init() ) { return 0; } break; case State.InReadContent: // if we have a correct decoder, go read if ( decoder == binHexDecoder ) { // read more binary data return ReadContentAsBinary( buffer, index, count ); } break; case State.InReadElementContent: throw new InvalidOperationException( Res.GetString( Res.Xml_MixingBinaryContentMethods ) ); default: Debug.Assert( false ); return 0; } Debug.Assert( state == State.InReadContent ); // setup binhex decoder InitBinHexDecoder(); // read more binary data return ReadContentAsBinary( buffer, index, count ); } internal int ReadElementContentAsBase64( byte[] buffer, int index, int count ) { // check arguments if ( buffer == null ) { throw new ArgumentNullException( "buffer" ); } if ( count < 0 ) { throw new ArgumentOutOfRangeException( "count" ); } if ( index < 0 ) { throw new ArgumentOutOfRangeException( "index" ); } if ( buffer.Length - index < count ) { throw new ArgumentOutOfRangeException( "count" ); } switch ( state ) { case State.None: if ( reader.NodeType != XmlNodeType.Element ) { throw reader.CreateReadElementContentAsException( "ReadElementContentAsBase64" ); } if ( !InitOnElement() ) { return 0; } break; case State.InReadContent: throw new InvalidOperationException( Res.GetString( Res.Xml_MixingBinaryContentMethods ) ); case State.InReadElementContent: // if we have a correct decoder, go read if ( decoder == base64Decoder ) { // read more binary data return ReadElementContentAsBinary( buffer, index, count ); } break; default: Debug.Assert( false ); return 0; } Debug.Assert( state == State.InReadElementContent ); // setup base64 decoder InitBase64Decoder(); // read more binary data return ReadElementContentAsBinary( buffer, index, count ); } internal int ReadElementContentAsBinHex( byte[] buffer, int index, int count ) { // check arguments if ( buffer == null ) { throw new ArgumentNullException( "buffer" ); } if ( count < 0 ) { throw new ArgumentOutOfRangeException( "count" ); } if ( index < 0 ) { throw new ArgumentOutOfRangeException( "index" ); } if ( buffer.Length - index < count ) { throw new ArgumentOutOfRangeException( "count" ); } switch ( state ) { case State.None: if ( reader.NodeType != XmlNodeType.Element ) { throw reader.CreateReadElementContentAsException( "ReadElementContentAsBinHex" ); } if ( !InitOnElement() ) { return 0; } break; case State.InReadContent: throw new InvalidOperationException( Res.GetString( Res.Xml_MixingBinaryContentMethods ) ); case State.InReadElementContent: // if we have a correct decoder, go read if ( decoder == binHexDecoder ) { // read more binary data return ReadElementContentAsBinary( buffer, index, count ); } break; default: Debug.Assert( false ); return 0; } Debug.Assert( state == State.InReadElementContent ); // setup binhex decoder InitBinHexDecoder(); // read more binary data return ReadElementContentAsBinary( buffer, index, count ); } internal void Finish() { if ( state != State.None ) { while ( MoveToNextContentNode( true ) ) ; if ( state == State.InReadElementContent ) { if ( reader.NodeType != XmlNodeType.EndElement ) { throw new XmlException( Res.Xml_InvalidNodeType, reader.NodeType.ToString(), reader as IXmlLineInfo ); } // move off the EndElement reader.Read(); } } Reset(); } internal void Reset() { state = State.None; isEnd = false; valueOffset = 0; } // Private methods private bool Init() { // make sure we are on a content node if ( !MoveToNextContentNode( false ) ) { return false; } state = State.InReadContent; isEnd = false; return true; } private bool InitOnElement() { Debug.Assert( reader.NodeType == XmlNodeType.Element ); bool isEmpty = reader.IsEmptyElement; // move to content or off the empty element reader.Read(); if ( isEmpty ) { return false; } // make sure we are on a content node if ( !MoveToNextContentNode( false ) ) { if ( reader.NodeType != XmlNodeType.EndElement ) { throw new XmlException( Res.Xml_InvalidNodeType, reader.NodeType.ToString(), reader as IXmlLineInfo ); } // move off end element reader.Read(); return false; } state = State.InReadElementContent; isEnd = false; return true; } private void InitBase64Decoder() { if ( base64Decoder == null ) { base64Decoder = new Base64Decoder(); } else { base64Decoder.Reset(); } decoder = base64Decoder; } private void InitBinHexDecoder() { if ( binHexDecoder == null ) { binHexDecoder = new BinHexDecoder(); } else { binHexDecoder.Reset(); } decoder = binHexDecoder; } private int ReadContentAsBinary( byte[] buffer, int index, int count ) { Debug.Assert( decoder != null ); if ( isEnd ) { Reset(); return 0; } decoder.SetNextOutputBuffer( buffer, index, count ); for (;;) { // use streaming ReadValueChunk if the reader supports it if ( canReadValueChunk ) { for (;;) { if ( valueOffset < valueChunkLength ) { int decodedCharsCount = decoder.Decode( valueChunk, valueOffset, valueChunkLength - valueOffset ); valueOffset += decodedCharsCount; } if ( decoder.IsFull ) { return decoder.DecodedCount; } Debug.Assert( valueOffset == valueChunkLength ); if ( ( valueChunkLength = reader.ReadValueChunk( valueChunk, 0, ChunkSize ) ) == 0 ) { break; } valueOffset = 0; } } else { // read what is reader.Value string value = reader.Value; int decodedCharsCount = decoder.Decode( value, valueOffset, value.Length - valueOffset ); valueOffset += decodedCharsCount; if ( decoder.IsFull ) { return decoder.DecodedCount; } } valueOffset = 0; // move to next textual node in the element content; throw on sub elements if ( !MoveToNextContentNode( true ) ) { isEnd = true; return decoder.DecodedCount; } } } private int ReadElementContentAsBinary( byte[] buffer, int index, int count ) { if ( count == 0 ) { return 0; } // read binary int decoded = ReadContentAsBinary( buffer, index, count ); if ( decoded > 0 ) { return decoded; } // if 0 bytes returned check if we are on a closing EndElement, throw exception if not if ( reader.NodeType != XmlNodeType.EndElement ) { throw new XmlException( Res.Xml_InvalidNodeType, reader.NodeType.ToString(), reader as IXmlLineInfo ); } // move off the EndElement reader.Read(); state = State.None; return 0; } bool MoveToNextContentNode( bool moveIfOnContentNode ) { do { switch ( reader.NodeType ) { case XmlNodeType.Attribute: return !moveIfOnContentNode; case XmlNodeType.Text: case XmlNodeType.Whitespace: case XmlNodeType.SignificantWhitespace: case XmlNodeType.CDATA: if ( !moveIfOnContentNode ) { return true; } break; case XmlNodeType.ProcessingInstruction: case XmlNodeType.Comment: case XmlNodeType.EndEntity: // skip comments, pis and end entity nodes break; case XmlNodeType.EntityReference: if ( reader.CanResolveEntity ) { reader.ResolveEntity(); break; } goto default; default: return false; } moveIfOnContentNode = false; } while ( reader.Read() ); return false; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- using System.Diagnostics; namespace System.Xml { internal class ReadContentAsBinaryHelper { // Private enums enum State { None, InReadContent, InReadElementContent, } // Fields XmlReader reader; State state; int valueOffset; bool isEnd; bool canReadValueChunk; char[] valueChunk; int valueChunkLength; IncrementalReadDecoder decoder; Base64Decoder base64Decoder; BinHexDecoder binHexDecoder; // Constants const int ChunkSize = 256; // Constructor internal ReadContentAsBinaryHelper( XmlReader reader ) { this.reader = reader; this.canReadValueChunk = reader.CanReadValueChunk; if ( canReadValueChunk ) { valueChunk = new char[ChunkSize]; } } // Static methods internal static ReadContentAsBinaryHelper CreateOrReset( ReadContentAsBinaryHelper helper, XmlReader reader ) { if ( helper == null ) { return new ReadContentAsBinaryHelper( reader ); } else { helper.Reset(); return helper; } } // Internal methods internal int ReadContentAsBase64( byte[] buffer, int index, int count ) { // check arguments if ( buffer == null ) { throw new ArgumentNullException( "buffer" ); } if ( count < 0 ) { throw new ArgumentOutOfRangeException( "count" ); } if ( index < 0 ) { throw new ArgumentOutOfRangeException( "index" ); } if ( buffer.Length - index < count ) { throw new ArgumentOutOfRangeException( "count" ); } switch ( state ) { case State.None: if ( !reader.CanReadContentAs() ) { throw reader.CreateReadContentAsException( "ReadContentAsBase64" ); } if ( !Init() ) { return 0; } break; case State.InReadContent: // if we have a correct decoder, go read if ( decoder == base64Decoder ) { // read more binary data return ReadContentAsBinary( buffer, index, count ); } break; case State.InReadElementContent: throw new InvalidOperationException( Res.GetString( Res.Xml_MixingBinaryContentMethods ) ); default: Debug.Assert( false ); return 0; } Debug.Assert( state == State.InReadContent ); // setup base64 decoder InitBase64Decoder(); // read more binary data return ReadContentAsBinary( buffer, index, count ); } internal int ReadContentAsBinHex( byte[] buffer, int index, int count ) { // check arguments if ( buffer == null ) { throw new ArgumentNullException( "buffer" ); } if ( count < 0 ) { throw new ArgumentOutOfRangeException( "count" ); } if ( index < 0 ) { throw new ArgumentOutOfRangeException( "index" ); } if ( buffer.Length - index < count ) { throw new ArgumentOutOfRangeException( "count" ); } switch ( state ) { case State.None: if ( !reader.CanReadContentAs() ) { throw reader.CreateReadContentAsException( "ReadContentAsBinHex" ); } if ( !Init() ) { return 0; } break; case State.InReadContent: // if we have a correct decoder, go read if ( decoder == binHexDecoder ) { // read more binary data return ReadContentAsBinary( buffer, index, count ); } break; case State.InReadElementContent: throw new InvalidOperationException( Res.GetString( Res.Xml_MixingBinaryContentMethods ) ); default: Debug.Assert( false ); return 0; } Debug.Assert( state == State.InReadContent ); // setup binhex decoder InitBinHexDecoder(); // read more binary data return ReadContentAsBinary( buffer, index, count ); } internal int ReadElementContentAsBase64( byte[] buffer, int index, int count ) { // check arguments if ( buffer == null ) { throw new ArgumentNullException( "buffer" ); } if ( count < 0 ) { throw new ArgumentOutOfRangeException( "count" ); } if ( index < 0 ) { throw new ArgumentOutOfRangeException( "index" ); } if ( buffer.Length - index < count ) { throw new ArgumentOutOfRangeException( "count" ); } switch ( state ) { case State.None: if ( reader.NodeType != XmlNodeType.Element ) { throw reader.CreateReadElementContentAsException( "ReadElementContentAsBase64" ); } if ( !InitOnElement() ) { return 0; } break; case State.InReadContent: throw new InvalidOperationException( Res.GetString( Res.Xml_MixingBinaryContentMethods ) ); case State.InReadElementContent: // if we have a correct decoder, go read if ( decoder == base64Decoder ) { // read more binary data return ReadElementContentAsBinary( buffer, index, count ); } break; default: Debug.Assert( false ); return 0; } Debug.Assert( state == State.InReadElementContent ); // setup base64 decoder InitBase64Decoder(); // read more binary data return ReadElementContentAsBinary( buffer, index, count ); } internal int ReadElementContentAsBinHex( byte[] buffer, int index, int count ) { // check arguments if ( buffer == null ) { throw new ArgumentNullException( "buffer" ); } if ( count < 0 ) { throw new ArgumentOutOfRangeException( "count" ); } if ( index < 0 ) { throw new ArgumentOutOfRangeException( "index" ); } if ( buffer.Length - index < count ) { throw new ArgumentOutOfRangeException( "count" ); } switch ( state ) { case State.None: if ( reader.NodeType != XmlNodeType.Element ) { throw reader.CreateReadElementContentAsException( "ReadElementContentAsBinHex" ); } if ( !InitOnElement() ) { return 0; } break; case State.InReadContent: throw new InvalidOperationException( Res.GetString( Res.Xml_MixingBinaryContentMethods ) ); case State.InReadElementContent: // if we have a correct decoder, go read if ( decoder == binHexDecoder ) { // read more binary data return ReadElementContentAsBinary( buffer, index, count ); } break; default: Debug.Assert( false ); return 0; } Debug.Assert( state == State.InReadElementContent ); // setup binhex decoder InitBinHexDecoder(); // read more binary data return ReadElementContentAsBinary( buffer, index, count ); } internal void Finish() { if ( state != State.None ) { while ( MoveToNextContentNode( true ) ) ; if ( state == State.InReadElementContent ) { if ( reader.NodeType != XmlNodeType.EndElement ) { throw new XmlException( Res.Xml_InvalidNodeType, reader.NodeType.ToString(), reader as IXmlLineInfo ); } // move off the EndElement reader.Read(); } } Reset(); } internal void Reset() { state = State.None; isEnd = false; valueOffset = 0; } // Private methods private bool Init() { // make sure we are on a content node if ( !MoveToNextContentNode( false ) ) { return false; } state = State.InReadContent; isEnd = false; return true; } private bool InitOnElement() { Debug.Assert( reader.NodeType == XmlNodeType.Element ); bool isEmpty = reader.IsEmptyElement; // move to content or off the empty element reader.Read(); if ( isEmpty ) { return false; } // make sure we are on a content node if ( !MoveToNextContentNode( false ) ) { if ( reader.NodeType != XmlNodeType.EndElement ) { throw new XmlException( Res.Xml_InvalidNodeType, reader.NodeType.ToString(), reader as IXmlLineInfo ); } // move off end element reader.Read(); return false; } state = State.InReadElementContent; isEnd = false; return true; } private void InitBase64Decoder() { if ( base64Decoder == null ) { base64Decoder = new Base64Decoder(); } else { base64Decoder.Reset(); } decoder = base64Decoder; } private void InitBinHexDecoder() { if ( binHexDecoder == null ) { binHexDecoder = new BinHexDecoder(); } else { binHexDecoder.Reset(); } decoder = binHexDecoder; } private int ReadContentAsBinary( byte[] buffer, int index, int count ) { Debug.Assert( decoder != null ); if ( isEnd ) { Reset(); return 0; } decoder.SetNextOutputBuffer( buffer, index, count ); for (;;) { // use streaming ReadValueChunk if the reader supports it if ( canReadValueChunk ) { for (;;) { if ( valueOffset < valueChunkLength ) { int decodedCharsCount = decoder.Decode( valueChunk, valueOffset, valueChunkLength - valueOffset ); valueOffset += decodedCharsCount; } if ( decoder.IsFull ) { return decoder.DecodedCount; } Debug.Assert( valueOffset == valueChunkLength ); if ( ( valueChunkLength = reader.ReadValueChunk( valueChunk, 0, ChunkSize ) ) == 0 ) { break; } valueOffset = 0; } } else { // read what is reader.Value string value = reader.Value; int decodedCharsCount = decoder.Decode( value, valueOffset, value.Length - valueOffset ); valueOffset += decodedCharsCount; if ( decoder.IsFull ) { return decoder.DecodedCount; } } valueOffset = 0; // move to next textual node in the element content; throw on sub elements if ( !MoveToNextContentNode( true ) ) { isEnd = true; return decoder.DecodedCount; } } } private int ReadElementContentAsBinary( byte[] buffer, int index, int count ) { if ( count == 0 ) { return 0; } // read binary int decoded = ReadContentAsBinary( buffer, index, count ); if ( decoded > 0 ) { return decoded; } // if 0 bytes returned check if we are on a closing EndElement, throw exception if not if ( reader.NodeType != XmlNodeType.EndElement ) { throw new XmlException( Res.Xml_InvalidNodeType, reader.NodeType.ToString(), reader as IXmlLineInfo ); } // move off the EndElement reader.Read(); state = State.None; return 0; } bool MoveToNextContentNode( bool moveIfOnContentNode ) { do { switch ( reader.NodeType ) { case XmlNodeType.Attribute: return !moveIfOnContentNode; case XmlNodeType.Text: case XmlNodeType.Whitespace: case XmlNodeType.SignificantWhitespace: case XmlNodeType.CDATA: if ( !moveIfOnContentNode ) { return true; } break; case XmlNodeType.ProcessingInstruction: case XmlNodeType.Comment: case XmlNodeType.EndEntity: // skip comments, pis and end entity nodes break; case XmlNodeType.EntityReference: if ( reader.CanResolveEntity ) { reader.ResolveEntity(); break; } goto default; default: return false; } moveIfOnContentNode = false; } while ( reader.Read() ); return false; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- BinaryWriter.cs
- ScrollPattern.cs
- FreezableCollection.cs
- ChannelEndpointElement.cs
- ToolStripSettings.cs
- DateTimeConstantAttribute.cs
- SamlAdvice.cs
- ProfilePropertyNameValidator.cs
- AlternateView.cs
- DeadCharTextComposition.cs
- ParamArrayAttribute.cs
- DelegatedStream.cs
- X509ChainElement.cs
- AddInActivator.cs
- EnumConverter.cs
- Journaling.cs
- MonthChangedEventArgs.cs
- BindingValueChangedEventArgs.cs
- ColorBlend.cs
- AutoScrollHelper.cs
- WebPartConnectionsCancelVerb.cs
- Errors.cs
- ListViewDataItem.cs
- CompModHelpers.cs
- HelpKeywordAttribute.cs
- JumpPath.cs
- SendKeys.cs
- EventProviderBase.cs
- RangeValidator.cs
- GridViewHeaderRowPresenter.cs
- CreateParams.cs
- Component.cs
- TypeDelegator.cs
- DragEvent.cs
- ColorAnimationBase.cs
- ErrorFormatter.cs
- FormViewUpdateEventArgs.cs
- VirtualPath.cs
- PrintDocument.cs
- SequenceDesigner.cs
- ContextBase.cs
- WizardForm.cs
- ObservableCollection.cs
- MissingSatelliteAssemblyException.cs
- PanelStyle.cs
- ICspAsymmetricAlgorithm.cs
- FunctionQuery.cs
- OrderedDictionary.cs
- DynamicContractTypeBuilder.cs
- XmlSchemaSimpleTypeList.cs
- HttpModuleCollection.cs
- TextModifierScope.cs
- WebPartDisplayModeCancelEventArgs.cs
- RectAnimationUsingKeyFrames.cs
- Size3DConverter.cs
- GeometryHitTestResult.cs
- TemplatedEditableDesignerRegion.cs
- ColumnHeaderConverter.cs
- TaskSchedulerException.cs
- OperandQuery.cs
- NumberFunctions.cs
- ToolStripProfessionalLowResolutionRenderer.cs
- ScaleTransform.cs
- IndicCharClassifier.cs
- SizeAnimation.cs
- IISUnsafeMethods.cs
- ValueQuery.cs
- DoubleAnimationUsingKeyFrames.cs
- X509Chain.cs
- EmbeddedMailObject.cs
- ExecutionPropertyManager.cs
- BufferedGraphicsManager.cs
- HtmlElementErrorEventArgs.cs
- ErasingStroke.cs
- SqlDataRecord.cs
- ConnectorRouter.cs
- Range.cs
- GridViewPageEventArgs.cs
- DataRelationPropertyDescriptor.cs
- DurableOperationAttribute.cs
- DictionaryChange.cs
- CqlErrorHelper.cs
- ComAdminWrapper.cs
- PrivacyNoticeBindingElementImporter.cs
- CompilationLock.cs
- SqlDataAdapter.cs
- TextTreeTextElementNode.cs
- CodeDomConfigurationHandler.cs
- WindowsScroll.cs
- AlphaSortedEnumConverter.cs
- MasterPageCodeDomTreeGenerator.cs
- StackOverflowException.cs
- CorrelationKeyCalculator.cs
- RightsManagementInformation.cs
- ChineseLunisolarCalendar.cs
- MultiByteCodec.cs
- ping.cs
- ToolStripControlHost.cs
- WebPartAuthorizationEventArgs.cs
- DockingAttribute.cs