Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / ManagedLibraries / Remoting / Channels / CORE / StreamHelper.cs / 1305376 / StreamHelper.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== //============================================================ // // File: StreamHelper.cs // // Summary: Helper methods for streams. // //=========================================================== using System; using System.IO; using System.Runtime.Remoting; using System.Threading; namespace System.Runtime.Remoting.Channels { internal static class StreamHelper { private static AsyncCallback _asyncCopyStreamReadCallback = new AsyncCallback(AsyncCopyStreamReadCallback); private static AsyncCallback _asyncCopyStreamWriteCallback = new AsyncCallback(AsyncCopyStreamWriteCallback); internal static void CopyStream(Stream source, Stream target) { if (source == null) return; // see if this is a ChunkedMemoryStream (we can do a direct write) ChunkedMemoryStream chunkedMemStream = source as ChunkedMemoryStream; if (chunkedMemStream != null) { chunkedMemStream.WriteTo(target); } else { // see if this is a MemoryStream (we can do a direct write) MemoryStream memContentStream = source as MemoryStream; if (memContentStream != null) { memContentStream.WriteTo(target); } else { // otherwise, we need to copy the data through an intermediate buffer byte[] buffer = CoreChannel.BufferPool.GetBuffer(); int bufferSize = buffer.Length; int readCount = source.Read(buffer, 0, bufferSize); while (readCount > 0) { target.Write(buffer, 0, readCount); readCount = source.Read(buffer, 0, bufferSize); } CoreChannel.BufferPool.ReturnBuffer(buffer); } } } // CopyStream internal static void BufferCopy(byte[] source, int srcOffset, byte[] dest, int destOffset, int count) { if (count > 8) { Buffer.BlockCopy(source, srcOffset, dest, destOffset, count); } else { for (int co = 0; co < count; co++) dest[destOffset + co] = source[srcOffset + co]; } } // BufferCopy internal static IAsyncResult BeginAsyncCopyStream( Stream source, Stream target, bool asyncRead, bool asyncWrite, bool closeSource, bool closeTarget, AsyncCallback callback, Object state) { AsyncCopyStreamResult streamState = new AsyncCopyStreamResult(callback, state); byte[] buffer = CoreChannel.BufferPool.GetBuffer(); streamState.Source = source; streamState.Target = target; streamState.Buffer = buffer; streamState.AsyncRead = asyncRead; streamState.AsyncWrite = asyncWrite; streamState.CloseSource = closeSource; streamState.CloseTarget = closeTarget; try { AsyncCopyReadHelper(streamState); } catch (Exception e) { streamState.SetComplete(null, e); } return streamState; } // BeginAsyncCopyStream internal static void EndAsyncCopyStream(IAsyncResult iar) { AsyncCopyStreamResult asyncResult = (AsyncCopyStreamResult)iar; if (!iar.IsCompleted) { iar.AsyncWaitHandle.WaitOne(); } if (asyncResult.Exception != null) { throw asyncResult.Exception; } } // EndAsyncCopyStream private static void AsyncCopyReadHelper(AsyncCopyStreamResult streamState) { // There is no try-catch here because the calling method always has a try-catch. if (streamState.AsyncRead) { byte[] buffer = streamState.Buffer; streamState.Source.BeginRead(buffer, 0, buffer.Length, _asyncCopyStreamReadCallback, streamState); } else { byte[] buffer = streamState.Buffer; int bytesRead = streamState.Source.Read(buffer, 0, buffer.Length); if (bytesRead == 0) { streamState.SetComplete(null, null); } else if (bytesRead < 0) { throw new RemotingException( CoreChannel.GetResourceString("Remoting_Stream_UnknownReadError")); } else { AsyncCopyWriteHelper(streamState, bytesRead); } } } // AsyncCopyReadHelper private static void AsyncCopyWriteHelper(AsyncCopyStreamResult streamState, int bytesRead) { // There is no try-catch here because the calling method always has a try-catch. if (streamState.AsyncWrite) { byte[] buffer = streamState.Buffer; streamState.Target.BeginWrite(buffer, 0, bytesRead, _asyncCopyStreamWriteCallback, streamState); } else { byte[] buffer = streamState.Buffer; streamState.Target.Write(buffer, 0, bytesRead); AsyncCopyReadHelper(streamState); } } // AsyncCopyWriteHelper private static void AsyncCopyStreamReadCallback(IAsyncResult iar) { AsyncCopyStreamResult state = (AsyncCopyStreamResult)iar.AsyncState; try { Stream source = state.Source; int bytesRead = source.EndRead(iar); if (bytesRead == 0) { state.SetComplete(null, null); } else if (bytesRead < 0) { throw new RemotingException( CoreChannel.GetResourceString("Remoting_Stream_UnknownReadError")); } else { AsyncCopyWriteHelper(state, bytesRead); } } catch (Exception e) { state.SetComplete(null, e); } } // AsyncCopyStreamReadCallback private static void AsyncCopyStreamWriteCallback(IAsyncResult iar) { AsyncCopyStreamResult state = (AsyncCopyStreamResult)iar.AsyncState; try { state.Target.EndWrite(iar); AsyncCopyReadHelper(state); } catch (Exception e) { state.SetComplete(null, e); } } // AsyncCopyStreamWriteCallback } // class StreamHelper internal class AsyncCopyStreamResult : BasicAsyncResult { internal Stream Source; internal Stream Target; internal byte[] Buffer; internal bool AsyncRead; internal bool AsyncWrite; internal bool CloseSource; internal bool CloseTarget; internal AsyncCopyStreamResult(AsyncCallback callback, Object state) : base(callback, state) { } internal override void CleanupOnComplete() { if (Buffer != null) CoreChannel.BufferPool.ReturnBuffer(Buffer); if (CloseSource) Source.Close(); if (CloseTarget) Target.Close(); } // CleanupOnComplete } // class AsyncCopyStreamResult } // namespace System.Runtime.Remoting.Channels // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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