Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / Mail / BufferedReadStream.cs / 1 / BufferedReadStream.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net { using System; using System.IO; internal class BufferedReadStream : DelegatedStream { byte[] storedBuffer; int storedLength; int storedOffset; bool readMore; internal BufferedReadStream(Stream stream) : this(stream, false) { } internal BufferedReadStream(Stream stream, bool readMore) : base(stream) { this.readMore = readMore; } public override bool CanWrite { get { return false; } } public override bool CanSeek { get { return false; } } public override IAsyncResult BeginRead(byte[] buffer, int offset, int count, AsyncCallback callback, object state) { ReadAsyncResult result = new ReadAsyncResult(this, callback, state); result.Read(buffer, offset, count); return result; } public override int EndRead(IAsyncResult asyncResult) { int read = ReadAsyncResult.End(asyncResult); return read; } public override int Read(byte[] buffer, int offset, int count) { int read = 0; if (this.storedOffset < this.storedLength) { read = Math.Min(count, this.storedLength - this.storedOffset); Buffer.BlockCopy(this.storedBuffer, this.storedOffset, buffer, offset, read); this.storedOffset += read; if (read == count || !this.readMore) { return read; } offset += read; count -= read; } return read + base.Read(buffer, offset, count); } public override int ReadByte() { if (this.storedOffset < this.storedLength) { return (int)this.storedBuffer[this.storedOffset++]; } else { return base.ReadByte(); } } internal void Push(byte[] buffer, int offset, int count) { if (count == 0) return; if (this.storedOffset == this.storedLength) { if (this.storedBuffer == null || this.storedBuffer.Length < count) { this.storedBuffer = new byte[count]; } this.storedOffset = 0; this.storedLength = count; } else { // if there's room to just insert before existing data if (count <= this.storedOffset) { this.storedOffset -= count; } // if there's room in the buffer but need to shift things over else if (count <= this.storedBuffer.Length - this.storedLength + this.storedOffset) { Buffer.BlockCopy(this.storedBuffer, this.storedOffset, this.storedBuffer, count, this.storedLength - this.storedOffset); this.storedLength += count - this.storedOffset; this.storedOffset = 0; } else { byte[] newBuffer = new byte[count + this.storedLength - this.storedOffset]; Buffer.BlockCopy(this.storedBuffer, this.storedOffset, newBuffer, count, this.storedLength - this.storedOffset); this.storedLength += count - this.storedOffset; this.storedOffset = 0; this.storedBuffer = newBuffer; } } Buffer.BlockCopy(buffer, offset, this.storedBuffer, this.storedOffset, count); } class ReadAsyncResult : LazyAsyncResult { BufferedReadStream parent; int read; static AsyncCallback onRead = new AsyncCallback(OnRead); internal ReadAsyncResult(BufferedReadStream parent, AsyncCallback callback, object state) : base(null,state,callback) { this.parent = parent; } internal void Read(byte[] buffer, int offset, int count){ if (parent.storedOffset < parent.storedLength) { this.read = Math.Min(count, parent.storedLength - parent.storedOffset); Buffer.BlockCopy(parent.storedBuffer, parent.storedOffset, buffer, offset, this.read); parent.storedOffset += this.read; if (this.read == count || !this.parent.readMore) { this.InvokeCallback(); return; } count -= this.read; offset += this.read; } IAsyncResult result = parent.BaseStream.BeginRead(buffer, offset, count, onRead, this); if (result.CompletedSynchronously) { // this.read += parent.BaseStream.EndRead(result); InvokeCallback(); } } internal static int End(IAsyncResult result) { ReadAsyncResult thisPtr = (ReadAsyncResult)result; thisPtr.InternalWaitForCompletion(); return thisPtr.read; } static void OnRead(IAsyncResult result) { if (!result.CompletedSynchronously) { ReadAsyncResult thisPtr = (ReadAsyncResult)result.AsyncState; try { thisPtr.read += thisPtr.parent.BaseStream.EndRead(result); thisPtr.InvokeCallback(); } catch (Exception e) { if (thisPtr.IsCompleted) throw; thisPtr.InvokeCallback(e); } catch { if (thisPtr.IsCompleted) throw; thisPtr.InvokeCallback(new Exception(SR.GetString(SR.net_nonClsCompliantException))); } } } } } }
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- HttpHandlerAction.cs
- FormViewInsertEventArgs.cs
- RuntimeTrackingProfile.cs
- Single.cs
- MergePropertyDescriptor.cs
- TextAction.cs
- SmtpNegotiateAuthenticationModule.cs
- LookupNode.cs
- SessionPageStatePersister.cs
- FormViewCommandEventArgs.cs
- RoleManagerEventArgs.cs
- WebContentFormatHelper.cs
- SemanticResultKey.cs
- ReliabilityContractAttribute.cs
- SqlUdtInfo.cs
- ArgumentValidation.cs
- PageRanges.cs
- RoleService.cs
- SingleConverter.cs
- NamespaceImport.cs
- ListDataBindEventArgs.cs
- DesignerTextViewAdapter.cs
- IERequestCache.cs
- UnauthorizedWebPart.cs
- SchemaTableOptionalColumn.cs
- PngBitmapDecoder.cs
- SiteMapHierarchicalDataSourceView.cs
- InputReportEventArgs.cs
- ContractsBCL.cs
- TextTreeTextBlock.cs
- InputLanguageSource.cs
- WpfMemberInvoker.cs
- SignatureHelper.cs
- SystemIPGlobalProperties.cs
- BindingWorker.cs
- SystemIPGlobalStatistics.cs
- ManagedFilter.cs
- SkipStoryboardToFill.cs
- SamlNameIdentifierClaimResource.cs
- FixedSOMPageConstructor.cs
- BuilderPropertyEntry.cs
- ISAPIWorkerRequest.cs
- ErasingStroke.cs
- Margins.cs
- KeySpline.cs
- Helper.cs
- NetworkAddressChange.cs
- ItemCollection.cs
- InputLanguageManager.cs
- HttpContext.cs
- ProtocolsConfigurationEntry.cs
- RichTextBox.cs
- FragmentQueryProcessor.cs
- Repeater.cs
- ButtonChrome.cs
- WorkflowNamespace.cs
- coordinatorscratchpad.cs
- DataGridClipboardHelper.cs
- DataGridViewCell.cs
- XpsPartBase.cs
- DbBuffer.cs
- ExternalException.cs
- SlipBehavior.cs
- FileIOPermission.cs
- SessionChannels.cs
- CellParagraph.cs
- QueryOperationResponseOfT.cs
- ServicePointManagerElement.cs
- RunWorkerCompletedEventArgs.cs
- CalendarBlackoutDatesCollection.cs
- XmlAttributeOverrides.cs
- _AutoWebProxyScriptHelper.cs
- WebUtil.cs
- ProtectedProviderSettings.cs
- EntityContainerEmitter.cs
- DaylightTime.cs
- InputReferenceExpression.cs
- TextEditorTables.cs
- AsyncDataRequest.cs
- AsyncPostBackTrigger.cs
- TableTextElementCollectionInternal.cs
- ConstructorNeedsTagAttribute.cs
- XmlSerializer.cs
- SqlConnectionPoolGroupProviderInfo.cs
- DecoderReplacementFallback.cs
- FileClassifier.cs
- RequestDescription.cs
- CursorInteropHelper.cs
- FileIOPermission.cs
- TemplateControlCodeDomTreeGenerator.cs
- WebProxyScriptElement.cs
- _UriSyntax.cs
- Monitor.cs
- OwnerDrawPropertyBag.cs
- EntityDescriptor.cs
- Menu.cs
- PropertyGridView.cs
- OleDbConnectionInternal.cs
- ParserHooks.cs
- WebRequestModulesSection.cs