Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Net / System / Net / Mail / MimeWriter.cs / 1 / MimeWriter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net.Mime { using System; using System.Collections; using System.IO; using System.Text; using System.Collections.Specialized; ////// Provides an abstraction for writing a MIME multi-part /// message. /// internal class MimeWriter:BaseWriter { static int DefaultLineLength = 78; static byte[] DASHDASH= new byte[] { (byte)'-', (byte)'-' }; static byte[] CRLF = new byte[] { (byte)'\r', (byte)'\n' }; byte[] boundaryBytes; BufferBuilder bufferBuilder = new BufferBuilder(); Stream contentStream; bool isInContent; int lineLength; EventHandler onCloseHandler; Stream stream; bool writeBoundary = true; string preface; static AsyncCallback onWrite = new AsyncCallback(OnWrite); internal MimeWriter(Stream stream, string boundary) : this(stream, boundary, null, DefaultLineLength) { } /* // Consider removing. internal MimeWriter(Stream stream, string boundary, int lineLength) : this(stream, boundary, null, lineLength) { } */ /* // Consider removing. internal MimeWriter(Stream stream, string boundary, string preface) : this(stream, boundary, preface, DefaultLineLength) { } */ internal MimeWriter(Stream stream, string boundary, string preface, int lineLength) { if (stream == null) throw new ArgumentNullException("stream"); if (boundary == null) throw new ArgumentNullException("boundary"); if (lineLength < 40) throw new ArgumentOutOfRangeException("lineLength", lineLength, SR.GetString(SR.MailWriterLineLengthTooSmall)); this.stream = stream; this.lineLength = lineLength; this.onCloseHandler = new EventHandler(OnClose); this.boundaryBytes = Encoding.ASCII.GetBytes(boundary); this.preface = preface; } internal IAsyncResult BeginClose(AsyncCallback callback, object state) { MultiAsyncResult multiResult = new MultiAsyncResult(this, callback, state); Close(multiResult); multiResult.CompleteSequence(); return multiResult; } internal void EndClose(IAsyncResult result) { MultiAsyncResult.End(result); this.stream.Close(); } internal override void Close() { Close(null); this.stream.Close(); } void Close(MultiAsyncResult multiResult) { this.bufferBuilder.Append(CRLF); this.bufferBuilder.Append(DASHDASH); this.bufferBuilder.Append(this.boundaryBytes); this.bufferBuilder.Append(DASHDASH); this.bufferBuilder.Append(CRLF); Flush(multiResult); } 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) { if (this.isInContent) throw new InvalidOperationException(SR.GetString(SR.MailWriterIsInContent)); this.isInContent = true; return GetContentStream(contentTransferEncoding, null); } internal override Stream GetContentStream() { return GetContentStream(ContentTransferEncoding.SevenBit); } Stream GetContentStream(ContentTransferEncoding contentTransferEncoding, MultiAsyncResult multiResult) { CheckBoundary(); 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)); CheckBoundary(); 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"); foreach (string key in headers) WriteHeader(key,headers[key]); } // 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) { if (this.contentStream != sender) return; // may have called WriteHeader this.contentStream.Flush(); this.contentStream = null; this.writeBoundary = true; this.isInContent = false; } ////// Writes the boundary sequence if required. /// void CheckBoundary() { if (this.preface != null) { this.bufferBuilder.Append(this.preface); this.preface = null; } if (this.writeBoundary) { this.bufferBuilder.Append(CRLF); this.bufferBuilder.Append(DASHDASH); this.bufferBuilder.Append(this.boundaryBytes); this.bufferBuilder.Append(CRLF); this.writeBoundary = false; } } static void OnWrite(IAsyncResult result) { if (!result.CompletedSynchronously) { MultiAsyncResult multiResult = (MultiAsyncResult)result.AsyncState; MimeWriter thisPtr = (MimeWriter)multiResult.Context; try { thisPtr.stream.EndWrite(result); multiResult.Leave(); } catch (Exception e) { multiResult.Leave(e); } catch { multiResult.Leave(new Exception(SR.GetString(SR.net_nonClsCompliantException))); } } } 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, int startLength) { for (int i = 0, l = 0, s = 0; ; i++) { if (i == value.Length) { if (i - s > 0) { this.bufferBuilder.Append(value, s, i - s); } break; } if (value[i] == ' ' || value[i] == '\t') { if (i - s >= this.lineLength - startLength) { startLength = 0; if (l == s) { l = i; } this.bufferBuilder.Append(value, s, l - s); this.bufferBuilder.Append(CRLF); s = l; } l = i; } } } } }
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