Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / Mail / MimePart.cs / 1305376 / MimePart.cs
using System; using System.IO; using System.Text; using System.Collections; using System.Globalization; using System.Net.Mail; namespace System.Net.Mime { ////// Summary description for MimePart. /// internal class MimePart: MimeBasePart,IDisposable { Stream stream = null; bool streamSet = false; bool streamUsedOnce = false; AsyncCallback readCallback; AsyncCallback writeCallback; const int maxBufferSize = 0x4400; //seems optimal for send based on perf analysis internal MimePart() { } public void Dispose(){ if (stream != null) { stream.Close(); } } internal Stream Stream { get { return stream; } } internal ContentDisposition ContentDisposition{ get{ return contentDisposition; } set{ contentDisposition = value; if(value == null){ ((HeaderCollection)Headers).InternalRemove(MailHeaderInfo.GetString(MailHeaderID.ContentDisposition)); } else{ contentDisposition.PersistIfNeeded((HeaderCollection)Headers,true); } } } internal TransferEncoding TransferEncoding { get { if (Headers[MailHeaderInfo.GetString(MailHeaderID.ContentTransferEncoding)].Equals("base64", StringComparison.OrdinalIgnoreCase)) return TransferEncoding.Base64; else if(Headers[MailHeaderInfo.GetString(MailHeaderID.ContentTransferEncoding)].Equals("quoted-printable", StringComparison.OrdinalIgnoreCase)) return TransferEncoding.QuotedPrintable; else if(Headers[MailHeaderInfo.GetString(MailHeaderID.ContentTransferEncoding)].Equals("7bit", StringComparison.OrdinalIgnoreCase)) return TransferEncoding.SevenBit; else return TransferEncoding.Unknown; } set { //QFE 4554 if (value == TransferEncoding.Base64) { Headers[MailHeaderInfo.GetString(MailHeaderID.ContentTransferEncoding)] = "base64"; } else if (value == TransferEncoding.QuotedPrintable) { Headers[MailHeaderInfo.GetString(MailHeaderID.ContentTransferEncoding)] = "quoted-printable"; } else if (value == TransferEncoding.SevenBit) { Headers[MailHeaderInfo.GetString(MailHeaderID.ContentTransferEncoding)] = "7bit"; } else { throw new NotSupportedException(SR.GetString(SR.MimeTransferEncodingNotSupported, value)); } } } internal void SetContent(Stream stream){ if (stream == null) { throw new ArgumentNullException("stream"); } if (streamSet) { this.stream.Close(); this.stream = null; streamSet = false; } this.stream = stream; streamSet = true; streamUsedOnce = false; TransferEncoding = TransferEncoding.Base64; } internal void SetContent(Stream stream, string name, string mimeType) { if (stream == null) { throw new ArgumentNullException("stream"); } if (mimeType != null && mimeType != string.Empty) { contentType = new ContentType(mimeType); } if (name != null && name != string.Empty) { ContentType.Name = name; } SetContent(stream); } internal void SetContent(Stream stream, ContentType contentType) { if (stream == null) { throw new ArgumentNullException("stream"); } this.contentType = contentType; SetContent(stream); } internal void Complete(IAsyncResult result, Exception e){ //if we already completed and we got called again, //it mean's that there was an exception in the callback and we //should just rethrow it. MimePartContext context = (MimePartContext)result.AsyncState; if (context.completed) { throw e; } try{ if(context.outputStream != null){ context.outputStream.Close(); } } catch(Exception ex){ if (e == null) { e = ex; } } context.completed = true; context.result.InvokeCallback(e); } internal void ReadCallback(IAsyncResult result) { if (result.CompletedSynchronously ) { return; } ((MimePartContext)result.AsyncState).completedSynchronously = false; try { ReadCallbackHandler(result); } catch(Exception e){ Complete(result,e); } } internal void ReadCallbackHandler(IAsyncResult result){ MimePartContext context = (MimePartContext)result.AsyncState; context.bytesLeft = Stream.EndRead(result); if (context.bytesLeft > 0) { IAsyncResult writeResult = context.outputStream.BeginWrite(context.buffer, 0, context.bytesLeft, writeCallback, context); if (writeResult.CompletedSynchronously) { WriteCallbackHandler(writeResult); } } else { Complete(result,null); } } internal void WriteCallback(IAsyncResult result) { if (result.CompletedSynchronously ) { return; } ((MimePartContext)result.AsyncState).completedSynchronously = false; try { WriteCallbackHandler(result); } catch (Exception e) { Complete(result,e); } } internal void WriteCallbackHandler(IAsyncResult result){ MimePartContext context = (MimePartContext)result.AsyncState; context.outputStream.EndWrite(result); IAsyncResult readResult = Stream.BeginRead(context.buffer, 0, context.buffer.Length, readCallback, context); if (readResult.CompletedSynchronously) { ReadCallbackHandler(readResult); } } internal Stream GetEncodedStream(Stream stream){ Stream outputStream = stream; if (TransferEncoding == TransferEncoding.Base64) { outputStream = new Base64Stream(outputStream, new Base64WriteStateInfo()); } else if (TransferEncoding == TransferEncoding.QuotedPrintable) { outputStream = new QuotedPrintableStream(outputStream,true); } else if (TransferEncoding == TransferEncoding.SevenBit) { outputStream = new SevenBitStream(outputStream); } return outputStream; } internal void ContentStreamCallbackHandler(IAsyncResult result){ MimePartContext context = (MimePartContext)result.AsyncState; Stream outputStream = context.writer.EndGetContentStream(result); context.outputStream = GetEncodedStream(outputStream); readCallback = new AsyncCallback(ReadCallback); writeCallback = new AsyncCallback(WriteCallback); IAsyncResult readResult = Stream.BeginRead(context.buffer, 0, context.buffer.Length,readCallback, context); if (readResult.CompletedSynchronously) { ReadCallbackHandler(readResult); } } internal void ContentStreamCallback(IAsyncResult result) { if (result.CompletedSynchronously ) { return; } ((MimePartContext)result.AsyncState).completedSynchronously = false; try{ ContentStreamCallbackHandler(result); } catch (Exception e) { Complete(result,e); } } internal class MimePartContext { internal MimePartContext(BaseWriter writer, LazyAsyncResult result) { this.writer = writer; this.result = result; buffer = new byte[maxBufferSize]; } internal Stream outputStream; internal LazyAsyncResult result; internal int bytesLeft; internal BaseWriter writer; internal byte[] buffer; internal bool completed; internal bool completedSynchronously = true; } internal override IAsyncResult BeginSend(BaseWriter writer, AsyncCallback callback, object state) { writer.WriteHeaders(Headers); MimePartAsyncResult result = new MimePartAsyncResult(this, state, callback); MimePartContext context = new MimePartContext(writer, result); ResetStream(); streamUsedOnce = true; IAsyncResult contentResult = writer.BeginGetContentStream(new AsyncCallback(ContentStreamCallback),context); if (contentResult.CompletedSynchronously) { ContentStreamCallbackHandler(contentResult); } return result; } internal override void Send(BaseWriter writer) { if (Stream != null) { byte[] buffer = new byte[maxBufferSize]; writer.WriteHeaders(Headers); Stream outputStream = writer.GetContentStream(); outputStream = GetEncodedStream(outputStream); int read; ResetStream(); streamUsedOnce = true; while ((read = Stream.Read(buffer, 0, maxBufferSize)) > 0) { outputStream.Write(buffer, 0, read); } outputStream.Close(); } } //Ensures that if we've used the stream once, we will either reset it to the origin, or throw. internal void ResetStream(){ if (streamUsedOnce) { if (Stream.CanSeek) { Stream.Seek(0,SeekOrigin.Begin); streamUsedOnce = false; } else{ throw new InvalidOperationException(SR.GetString(SR.MimePartCantResetStream)); } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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