Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / Mail / MailWriter.cs / 1305376 / MailWriter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net.Mail { using System; using System.Collections; using System.IO; using System.Text; using System.Collections.Specialized; using System.Net.Mime; internal class MailWriter:BaseWriter { static byte[] CRLF = new byte[] { (byte)'\r', (byte)'\n' }; //this is the maximum default line length that can actually be written. When encoding //headers, the line length is more conservative to account for things like folding. //in MailWriter, all encoding has already been done so this will only fold lines //that are NOT encoded already, which means being less conservative is ok. static int writerDefaultLineLength = 76; Stream contentStream; bool isInContent; int lineLength; EventHandler onCloseHandler; Stream stream; BufferBuilder bufferBuilder = new BufferBuilder(); static AsyncCallback onWrite = new AsyncCallback(OnWrite); ////// ctor. /// /// Underlying stream internal MailWriter(Stream stream) : this(stream, writerDefaultLineLength) { } ////// ctor. /// /// Underlying stream /// Preferred line length internal MailWriter(Stream stream, int lineLength) { if (stream == null) throw new ArgumentNullException("stream"); if (lineLength < 0) throw new ArgumentOutOfRangeException("lineLength"); this.stream = stream; this.lineLength = lineLength; this.onCloseHandler = new EventHandler(OnClose); } ////// Closes underlying stream. /// internal override void Close() { // this.stream.Write(CRLF,0,2); this.stream.Close(); } internal IAsyncResult BeginGetContentStream(ContentTransferEncoding contentTransferEncoding, AsyncCallback callback, object state) { MultiAsyncResult multiResult = new MultiAsyncResult(this, callback, state); Stream s = GetContentStream(contentTransferEncoding, multiResult); if (!(multiResult.Result is Exception)) multiResult.Result = s; multiResult.CompleteSequence(); return multiResult; } internal override IAsyncResult BeginGetContentStream(AsyncCallback callback, object state) { return BeginGetContentStream(ContentTransferEncoding.SevenBit, callback, state); } internal override Stream EndGetContentStream(IAsyncResult result) { object o = MultiAsyncResult.End(result); if(o is Exception){ throw (Exception) o; } return (Stream)o; } internal Stream GetContentStream(ContentTransferEncoding contentTransferEncoding) { return GetContentStream(contentTransferEncoding, null); } internal override Stream GetContentStream() { return GetContentStream(ContentTransferEncoding.SevenBit); } Stream GetContentStream(ContentTransferEncoding contentTransferEncoding, MultiAsyncResult multiResult) { if (this.isInContent) throw new InvalidOperationException(SR.GetString(SR.MailWriterIsInContent)); this.isInContent = true; this.bufferBuilder.Append(CRLF); Flush(multiResult); Stream stream = this.stream; if (contentTransferEncoding == ContentTransferEncoding.SevenBit) stream = new SevenBitStream(stream); else if (contentTransferEncoding == ContentTransferEncoding.QuotedPrintable) stream = new QuotedPrintableStream(stream, this.lineLength); else if (contentTransferEncoding == ContentTransferEncoding.Base64) stream = new Base64Stream(stream, this.lineLength); ClosableStream cs = new ClosableStream(stream, this.onCloseHandler); this.contentStream = cs; return cs; } internal override void WriteHeader(string name, string value) { if (name == null) throw new ArgumentNullException("name"); if (value == null) throw new ArgumentNullException("value"); if (this.isInContent) throw new InvalidOperationException(SR.GetString(SR.MailWriterIsInContent)); this.bufferBuilder.Append(name); this.bufferBuilder.Append(": "); WriteAndFold(value);//, name.Length + 2); this.bufferBuilder.Append(CRLF); } internal override void WriteHeaders(NameValueCollection headers) { if (headers == null) throw new ArgumentNullException("headers"); if (this.isInContent) throw new InvalidOperationException(SR.GetString(SR.MailWriterIsInContent)); foreach (string key in headers) { string[] values = headers.GetValues(key); foreach (string value in values) WriteHeader(key, value); } } // helper methods ////// Called when the current stream is closed. Allows us to /// prepare for the next message part. /// /// Sender of the close event /// Event args (not used) void OnClose(object sender, EventArgs args) { System.Diagnostics.Debug.Assert(this.contentStream == sender); this.contentStream.Flush(); this.contentStream = null; } static void OnWrite(IAsyncResult result) { if (!result.CompletedSynchronously) { MultiAsyncResult multiResult = (MultiAsyncResult)result.AsyncState; MailWriter thisPtr = (MailWriter)multiResult.Context; try { thisPtr.stream.EndWrite(result); multiResult.Leave(); } catch (Exception e) { multiResult.Leave(e); } } } void Flush(MultiAsyncResult multiResult) { if (this.bufferBuilder.Length > 0) { if (multiResult != null) { multiResult.Enter(); IAsyncResult result = this.stream.BeginWrite(this.bufferBuilder.GetBuffer(), 0, this.bufferBuilder.Length, onWrite, multiResult); if (result.CompletedSynchronously) { this.stream.EndWrite(result); multiResult.Leave(); } } else { this.stream.Write(this.bufferBuilder.GetBuffer(), 0, this.bufferBuilder.Length); } this.bufferBuilder.Reset(); } } void WriteAndFold(string value) { //only fold if line does not contain a soft CRLF. This is for non-byte-encoded headers and //the message body if (value.Length < writerDefaultLineLength || value.Contains("\r\n")) { bufferBuilder.Append(value); return; } int i = 0; int j = value.Length; while (j - i > writerDefaultLineLength){ int whiteSpace = value.LastIndexOf(' ', i + writerDefaultLineLength - 1, writerDefaultLineLength-1); if (whiteSpace > -1) { bufferBuilder.Append(value, i, whiteSpace-i); bufferBuilder.Append(CRLF); i = whiteSpace; } else { bufferBuilder.Append(value, i, writerDefaultLineLength); i += writerDefaultLineLength; } } if (i < j){ bufferBuilder.Append(value, i, j-i); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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