Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / ndp / fx / src / Net / System / Net / SecureProtocols / _FixedSizeReader.cs / 1 / _FixedSizeReader.cs
/*++ Copyright (c) 2000 Microsoft Corporation Module Name: _FixedSizeReader.cs Abstract: The class is a simple wrapper on top of a read stream. It will read the exact number of bytes requested. It operates either [....] or async. Author: Alexei Vopilov Aug 18 2003 Revision History: --*/ namespace System.Net { using System; using System.IO; using System.Threading; // // Reads a fixed size packet from a stream, can disover EOF as 0 bytes read from stream // internal class FixedSizeReader { private static readonly AsyncCallback _ReadCallback = new AsyncCallback(ReadCallback); private readonly Stream _Transport; private AsyncProtocolRequest _Request; private int _TotalRead; public FixedSizeReader(Stream transport) { _Transport = transport; } // // Returns 0 on legitimate EOF or if 0 bytes was requested, otheriwse reads as directed or throws // Returns count on success // public int ReadPacket(byte[] buffer, int offset, int count) { int tempCount = count; do { int bytes = _Transport.Read(buffer, offset, tempCount); if (bytes == 0) { if (tempCount != count) { throw new IOException(SR.GetString(SR.net_io_eof)); } return 0; } tempCount -= bytes; offset += bytes; }while (tempCount != 0); return count; } // // Completes "_Request" with 0 if 0 bytes was requested or legitimate EOF received // Otheriwse, reads as directed or completes "_Request" with an Exception or throws right here // public void AsyncReadPacket(AsyncProtocolRequest request) { _Request = request; _TotalRead = 0; StartReading(); } // // Loops while subsequest completions are [....] // private void StartReading() { while (true) { IAsyncResult ar = _Transport.BeginRead(_Request.Buffer, _Request.Offset+_TotalRead, _Request.Count-_TotalRead, _ReadCallback, this); if (!ar.CompletedSynchronously) { #if DEBUG _Request._DebugAsyncChain = ar; #endif break; } int bytes = _Transport.EndRead(ar); if (CheckCompletionBeforeNextRead(bytes)) { break; } } } // // // private bool CheckCompletionBeforeNextRead(int bytes) { if (bytes == 0) { // 0 bytes was requested or EOF in the beginning of a frame, the caller should decide whether it's OK if(_TotalRead == 0) { _Request.CompleteRequest(0); return true; } // EOF in the middle of a frame, bummer! throw new IOException(SR.GetString(SR.net_io_eof)); } GlobalLog.Assert(_TotalRead + bytes <= _Request.Count, "FixedSizeReader::CheckCompletion()|State got out of range. Total:{0} Count:{1}", _TotalRead + bytes, _Request.Count); if ((_TotalRead+=bytes) == _Request.Count) { _Request.CompleteRequest(_Request.Count); return true; } return false; } // // // private static void ReadCallback(IAsyncResult transportResult) { GlobalLog.Assert(transportResult.AsyncState is FixedSizeReader, "ReadCallback|State type is wrong, expected FixedSizeReader."); if (transportResult.CompletedSynchronously) { return; } FixedSizeReader reader = (FixedSizeReader)transportResult.AsyncState; AsyncProtocolRequest request = reader._Request; // Async completion try { int bytes = reader._Transport.EndRead(transportResult); if (reader.CheckCompletionBeforeNextRead(bytes)) { return; } reader.StartReading(); } catch (Exception e) { if (request.IsUserCompleted) throw; request.CompleteWithError(e); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. /*++ Copyright (c) 2000 Microsoft Corporation Module Name: _FixedSizeReader.cs Abstract: The class is a simple wrapper on top of a read stream. It will read the exact number of bytes requested. It operates either [....] or async. Author: Alexei Vopilov Aug 18 2003 Revision History: --*/ namespace System.Net { using System; using System.IO; using System.Threading; // // Reads a fixed size packet from a stream, can disover EOF as 0 bytes read from stream // internal class FixedSizeReader { private static readonly AsyncCallback _ReadCallback = new AsyncCallback(ReadCallback); private readonly Stream _Transport; private AsyncProtocolRequest _Request; private int _TotalRead; public FixedSizeReader(Stream transport) { _Transport = transport; } // // Returns 0 on legitimate EOF or if 0 bytes was requested, otheriwse reads as directed or throws // Returns count on success // public int ReadPacket(byte[] buffer, int offset, int count) { int tempCount = count; do { int bytes = _Transport.Read(buffer, offset, tempCount); if (bytes == 0) { if (tempCount != count) { throw new IOException(SR.GetString(SR.net_io_eof)); } return 0; } tempCount -= bytes; offset += bytes; }while (tempCount != 0); return count; } // // Completes "_Request" with 0 if 0 bytes was requested or legitimate EOF received // Otheriwse, reads as directed or completes "_Request" with an Exception or throws right here // public void AsyncReadPacket(AsyncProtocolRequest request) { _Request = request; _TotalRead = 0; StartReading(); } // // Loops while subsequest completions are [....] // private void StartReading() { while (true) { IAsyncResult ar = _Transport.BeginRead(_Request.Buffer, _Request.Offset+_TotalRead, _Request.Count-_TotalRead, _ReadCallback, this); if (!ar.CompletedSynchronously) { #if DEBUG _Request._DebugAsyncChain = ar; #endif break; } int bytes = _Transport.EndRead(ar); if (CheckCompletionBeforeNextRead(bytes)) { break; } } } // // // private bool CheckCompletionBeforeNextRead(int bytes) { if (bytes == 0) { // 0 bytes was requested or EOF in the beginning of a frame, the caller should decide whether it's OK if(_TotalRead == 0) { _Request.CompleteRequest(0); return true; } // EOF in the middle of a frame, bummer! throw new IOException(SR.GetString(SR.net_io_eof)); } GlobalLog.Assert(_TotalRead + bytes <= _Request.Count, "FixedSizeReader::CheckCompletion()|State got out of range. Total:{0} Count:{1}", _TotalRead + bytes, _Request.Count); if ((_TotalRead+=bytes) == _Request.Count) { _Request.CompleteRequest(_Request.Count); return true; } return false; } // // // private static void ReadCallback(IAsyncResult transportResult) { GlobalLog.Assert(transportResult.AsyncState is FixedSizeReader, "ReadCallback|State type is wrong, expected FixedSizeReader."); if (transportResult.CompletedSynchronously) { return; } FixedSizeReader reader = (FixedSizeReader)transportResult.AsyncState; AsyncProtocolRequest request = reader._Request; // Async completion try { int bytes = reader._Transport.EndRead(transportResult); if (reader.CheckCompletionBeforeNextRead(bytes)) { return; } reader.StartReading(); } catch (Exception e) { if (request.IsUserCompleted) throw; request.CompleteWithError(e); } } } } // 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
- DataGridRow.cs
- DocumentApplication.cs
- CodeDesigner.cs
- EnterpriseServicesHelper.cs
- ControlCommandSet.cs
- FrameworkEventSource.cs
- WebCodeGenerator.cs
- Scene3D.cs
- SynchronizedInputPattern.cs
- CollectionChangeEventArgs.cs
- SyndicationFeedFormatter.cs
- RoutedCommand.cs
- TabItemWrapperAutomationPeer.cs
- FrameSecurityDescriptor.cs
- PrintDocument.cs
- GeneralTransform3D.cs
- TextEditorSelection.cs
- DoubleAnimationClockResource.cs
- TraceXPathNavigator.cs
- Thickness.cs
- TextTreeTextNode.cs
- FixedSchema.cs
- CleanUpVirtualizedItemEventArgs.cs
- RowCache.cs
- ComboBox.cs
- ContentElementAutomationPeer.cs
- CultureInfoConverter.cs
- _CookieModule.cs
- MultilineStringConverter.cs
- SqlDataSourceSelectingEventArgs.cs
- LoginCancelEventArgs.cs
- XmlSecureResolver.cs
- AutoCompleteStringCollection.cs
- ToolStripDropTargetManager.cs
- LazyTextWriterCreator.cs
- ListenUriMode.cs
- HashMembershipCondition.cs
- StateDesigner.CommentLayoutGlyph.cs
- versioninfo.cs
- DataDocumentXPathNavigator.cs
- XsltOutput.cs
- HMACRIPEMD160.cs
- AuthenticationService.cs
- InlineUIContainer.cs
- WebServiceEnumData.cs
- EventSourceCreationData.cs
- XmlObjectSerializerContext.cs
- MessageDispatch.cs
- CardSpaceException.cs
- TextEffectResolver.cs
- SerializationAttributes.cs
- GridView.cs
- AxisAngleRotation3D.cs
- EventProviderWriter.cs
- XPathExpr.cs
- DockPattern.cs
- Contracts.cs
- SafeWaitHandle.cs
- ObjectConverter.cs
- ListViewTableRow.cs
- HtmlImageAdapter.cs
- SerializationAttributes.cs
- SQLDateTimeStorage.cs
- XmlDictionary.cs
- brushes.cs
- ApplicationTrust.cs
- ObjectDataProvider.cs
- Attribute.cs
- InvokeHandlers.cs
- CancellationHandlerDesigner.cs
- LiteralDesigner.cs
- ResourceDescriptionAttribute.cs
- ChannelFactory.cs
- XmlStringTable.cs
- UdpAnnouncementEndpoint.cs
- XmlSchemaComplexContent.cs
- ProxyDataContractResolver.cs
- _MultipleConnectAsync.cs
- CodeParameterDeclarationExpressionCollection.cs
- TextDecorationLocationValidation.cs
- RelativeSource.cs
- initElementDictionary.cs
- ToolStripDesignerUtils.cs
- DependsOnAttribute.cs
- EdmSchemaAttribute.cs
- CaseExpr.cs
- CounterNameConverter.cs
- FixedSOMPage.cs
- DataObjectFieldAttribute.cs
- DataRecordInfo.cs
- PerformanceCounterPermission.cs
- DataContractAttribute.cs
- TimeoutTimer.cs
- ObjectDataSourceView.cs
- GridViewColumn.cs
- filewebresponse.cs
- StylusSystemGestureEventArgs.cs
- RequestResizeEvent.cs
- SkewTransform.cs
- CheckBoxList.cs