Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / 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
- Pair.cs
- OrderedDictionary.cs
- MemoryMappedView.cs
- objectquery_tresulttype.cs
- LogSwitch.cs
- RemoteWebConfigurationHostServer.cs
- MsmqHostedTransportManager.cs
- CodeAttributeArgumentCollection.cs
- ToolStripDropDownItem.cs
- ReferenceEqualityComparer.cs
- IriParsingElement.cs
- EnumType.cs
- SafeCertificateContext.cs
- OverflowException.cs
- TextServicesCompartmentEventSink.cs
- NotifyInputEventArgs.cs
- ContextBase.cs
- Calendar.cs
- FlowLayoutSettings.cs
- ThreadStartException.cs
- ISFTagAndGuidCache.cs
- DataGridViewCellErrorTextNeededEventArgs.cs
- DynamicDiscoveryDocument.cs
- RC2.cs
- UriSectionData.cs
- QilFactory.cs
- Stylesheet.cs
- ObjectView.cs
- translator.cs
- Int16Converter.cs
- safemediahandle.cs
- PointIndependentAnimationStorage.cs
- ExtensionsSection.cs
- PackageFilter.cs
- SecurityState.cs
- NegatedConstant.cs
- RedirectionProxy.cs
- ValueProviderWrapper.cs
- WebCategoryAttribute.cs
- ISessionStateStore.cs
- TdsParserHelperClasses.cs
- Frame.cs
- FieldNameLookup.cs
- ProfilePropertyNameValidator.cs
- TreeNode.cs
- XsltSettings.cs
- TypeConverterValueSerializer.cs
- SiteMapNodeCollection.cs
- NamedObject.cs
- WorkflowApplicationCompletedException.cs
- RectConverter.cs
- CssTextWriter.cs
- DashStyles.cs
- FileSystemInfo.cs
- coordinatorscratchpad.cs
- ComboBox.cs
- Transactions.cs
- ItemList.cs
- EventManager.cs
- XmlSchemaAppInfo.cs
- DataTableReader.cs
- _AuthenticationState.cs
- XmlDigitalSignatureProcessor.cs
- GeneralTransform3DTo2D.cs
- UserControlParser.cs
- ComponentGuaranteesAttribute.cs
- StdValidatorsAndConverters.cs
- ExtensionDataObject.cs
- PropertyGeneratedEventArgs.cs
- DriveNotFoundException.cs
- SchemaNotation.cs
- SpecularMaterial.cs
- ReadOnlyObservableCollection.cs
- AttributeQuery.cs
- DynamicResourceExtensionConverter.cs
- XmlNodeReader.cs
- TabletDeviceInfo.cs
- DropSource.cs
- XmlDeclaration.cs
- TextReturnReader.cs
- SystemGatewayIPAddressInformation.cs
- RangeBase.cs
- BufferBuilder.cs
- RelationshipEndMember.cs
- Utils.cs
- _ListenerAsyncResult.cs
- HttpPostProtocolImporter.cs
- PersonalizationProviderCollection.cs
- path.cs
- LocalizationParserHooks.cs
- RelationshipWrapper.cs
- SubpageParagraph.cs
- SortFieldComparer.cs
- BitArray.cs
- Common.cs
- PTUtility.cs
- SctClaimSerializer.cs
- _LoggingObject.cs
- NameValueCollection.cs
- ExternalCalls.cs