//
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// ResponseStream.cs
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// Copied from System.Net.ResponseStream
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//
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// Author:
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// Gonzalo Paniagua Javier (gonzalo@novell.com)
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//
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// Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.IO;
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using System.Net;
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using System.Net.Sockets;
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using System.Text;
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using System.Runtime.InteropServices;
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namespace WebSocketSharp.Net {
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// FIXME: Does this buffer the response until Close?
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// Update: we send a single packet for the first non-chunked Write
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// What happens when we set content-length to X and write X-1 bytes then close?
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// what if we don't set content-length at all?
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class ResponseStream : Stream
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{
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HttpListenerResponse response;
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bool ignore_errors;
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bool disposed;
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bool trailer_sent;
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System.IO.Stream stream;
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internal ResponseStream (System.IO.Stream stream, HttpListenerResponse response, bool ignore_errors)
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{
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this.response = response;
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this.ignore_errors = ignore_errors;
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this.stream = stream;
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}
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public override bool CanRead {
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get { return false; }
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}
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public override bool CanSeek {
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get { return false; }
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}
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public override bool CanWrite {
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get { return true; }
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}
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public override long Length {
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get { throw new NotSupportedException (); }
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}
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public override long Position {
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get { throw new NotSupportedException (); }
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set { throw new NotSupportedException (); }
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}
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public override void Close ()
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{
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if (disposed == false) {
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disposed = true;
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byte [] bytes = null;
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MemoryStream ms = GetHeaders (true);
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bool chunked = response.SendChunked;
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if (ms != null) {
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long start = ms.Position;
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if (chunked && !trailer_sent) {
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bytes = GetChunkSizeBytes (0, true);
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ms.Position = ms.Length;
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ms.Write (bytes, 0, bytes.Length);
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}
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InternalWrite (ms.GetBuffer (), (int) start, (int) (ms.Length - start));
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trailer_sent = true;
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} else if (chunked && !trailer_sent) {
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bytes = GetChunkSizeBytes (0, true);
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InternalWrite (bytes, 0, bytes.Length);
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trailer_sent = true;
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}
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response.Close ();
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}
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}
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MemoryStream GetHeaders (bool closing)
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{
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if (response.HeadersSent)
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return null;
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MemoryStream ms = new MemoryStream ();
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response.SendHeaders (closing, ms);
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return ms;
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}
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public override void Flush ()
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{
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}
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static byte [] crlf = new byte [] { 13, 10 };
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static byte [] GetChunkSizeBytes (int size, bool final)
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{
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string str = String.Format ("{0:x}\r\n{1}", size, final ? "\r\n" : "");
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return Encoding.ASCII.GetBytes (str);
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}
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internal void InternalWrite (byte [] buffer, int offset, int count)
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{
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if (ignore_errors) {
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try {
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stream.Write (buffer, offset, count);
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} catch { }
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} else {
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stream.Write (buffer, offset, count);
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}
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}
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public override void Write (byte [] buffer, int offset, int count)
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{
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if (disposed)
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throw new ObjectDisposedException (GetType ().ToString ());
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byte [] bytes = null;
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MemoryStream ms = GetHeaders (false);
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bool chunked = response.SendChunked;
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if (ms != null) {
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long start = ms.Position; // After the possible preamble for the encoding
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ms.Position = ms.Length;
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if (chunked) {
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bytes = GetChunkSizeBytes (count, false);
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ms.Write (bytes, 0, bytes.Length);
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}
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int new_count = Math.Min (count, 16384 - (int) ms.Position + (int) start);
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ms.Write (buffer, offset, new_count);
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count -= new_count;
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offset += new_count;
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InternalWrite (ms.GetBuffer (), (int) start, (int) (ms.Length - start));
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ms.SetLength (0);
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ms.Capacity = 0; // 'dispose' the buffer in ms.
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} else if (chunked) {
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bytes = GetChunkSizeBytes (count, false);
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InternalWrite (bytes, 0, bytes.Length);
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}
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if (count > 0)
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InternalWrite (buffer, offset, count);
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if (chunked)
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InternalWrite (crlf, 0, 2);
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}
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public override IAsyncResult BeginWrite (byte [] buffer, int offset, int count,
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AsyncCallback cback, object state)
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{
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if (disposed)
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throw new ObjectDisposedException (GetType ().ToString ());
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byte [] bytes = null;
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MemoryStream ms = GetHeaders (false);
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bool chunked = response.SendChunked;
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if (ms != null) {
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long start = ms.Position;
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ms.Position = ms.Length;
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if (chunked) {
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bytes = GetChunkSizeBytes (count, false);
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ms.Write (bytes, 0, bytes.Length);
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}
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ms.Write (buffer, offset, count);
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buffer = ms.GetBuffer ();
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offset = (int) start;
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count = (int) (ms.Position - start);
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} else if (chunked) {
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bytes = GetChunkSizeBytes (count, false);
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InternalWrite (bytes, 0, bytes.Length);
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}
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return stream.BeginWrite (buffer, offset, count, cback, state);
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}
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public override void EndWrite (IAsyncResult ares)
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{
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if (disposed)
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throw new ObjectDisposedException (GetType ().ToString ());
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if (ignore_errors) {
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try {
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stream.EndWrite (ares);
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if (response.SendChunked)
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stream.Write (crlf, 0, 2);
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} catch { }
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} else {
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stream.EndWrite (ares);
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if (response.SendChunked)
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stream.Write (crlf, 0, 2);
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}
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}
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public override int Read ([In,Out] byte[] buffer, int offset, int count)
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{
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throw new NotSupportedException ();
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}
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public override IAsyncResult BeginRead (byte [] buffer, int offset, int count,
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AsyncCallback cback, object state)
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{
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throw new NotSupportedException ();
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}
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public override int EndRead (IAsyncResult ares)
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{
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throw new NotSupportedException ();
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}
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public override long Seek (long offset, SeekOrigin origin)
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{
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throw new NotSupportedException ();
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}
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public override void SetLength (long value)
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{
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throw new NotSupportedException ();
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}
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}
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}
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