mcs/class/System/System.Net/ResponseStream.cs

   1 //
   2 // System.Net.ResponseStream
   3 //
   4 // Author:
   5 //      Gonzalo Paniagua Javier (gonzalo@novell.com)
   6 //
   7 // Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 #if NET_2_0 && SECURITY_DEP
  30
  31 using System.IO;
  32 using System.Net.Sockets;
  33 using System.Text;
  34 using System.Runtime.InteropServices;
  35 namespace System.Net {
  36         // FIXME: Does this buffer the response until Close?
  37         // Update: we send a single packet for the first non-chunked Write
  38         // What happens when we set content-length to X and write X-1 bytes then close?
  39         // what if we don't set content-length at all?
  40         class ResponseStream : Stream
  41         {
  42                 HttpListenerResponse response;
  43                 bool ignore_errors;
  44                 bool disposed;
  45                 bool trailer_sent;
  46                 Stream stream;
  47
  48                 internal ResponseStream (Stream stream, HttpListenerResponse response, bool ignore_errors)
  49                 {
  50                         this.response = response;
  51                         this.ignore_errors = ignore_errors;
  52                         this.stream = stream;
  53                 }
  54
  55                 public override bool CanRead {
  56                         get { return false; }
  57                 }
  58
  59                 public override bool CanSeek {
  60                         get { return false; }
  61                 }
  62
  63                 public override bool CanWrite {
  64                         get { return true; }
  65                 }
  66
  67                 public override long Length {
  68                         get { throw new NotSupportedException (); }
  69                 }
  70
  71                 public override long Position {
  72                         get { throw new NotSupportedException (); }
  73                         set { throw new NotSupportedException (); }
  74                 }
  75
  76
  77                 public override void Close ()
  78                 {
  79                         if (disposed == false) {
  80                                 disposed = true;
  81                                 byte [] bytes = null;
  82                                 MemoryStream ms = GetHeaders (true);
  83                                 bool chunked = response.SendChunked;
  84                                 if (ms != null) {
  85                                         long start = ms.Position;
  86                                         if (chunked && !trailer_sent) {
  87                                                 bytes = GetChunkSizeBytes (0, true);
  88                                                 ms.Position = ms.Length;
  89                                                 ms.Write (bytes, 0, bytes.Length);
  90                                         }
  91                                         InternalWrite (ms.GetBuffer (), (int) start, (int) (ms.Length - start));
  92                                         trailer_sent = true;
  93                                 } else if (chunked && !trailer_sent) {
  94                                         bytes = GetChunkSizeBytes (0, true);
  95                                         InternalWrite (bytes, 0, bytes.Length);
  96                                         trailer_sent = true;
  97                                 }
  98                                 response.Close ();
  99                         }
 100                 }
 101
 102                 MemoryStream GetHeaders (bool closing)
 103                 {
 104                         if (response.HeadersSent)
 105                                 return null;
 106                         MemoryStream ms = new MemoryStream ();
 107                         response.SendHeaders (closing, ms);
 108                         return ms;
 109                 }
 110
 111                 public override void Flush ()
 112                 {
 113                 }
 114
 115                 static byte [] crlf = new byte [] { 13, 10 };
 116                 static byte [] GetChunkSizeBytes (int size, bool final)
 117                 {
 118                         string str = String.Format ("{0:x}\r\n{1}", size, final ? "\r\n" : "");
 119                         return Encoding.ASCII.GetBytes (str);
 120                 }
 121
 122                 internal void InternalWrite (byte [] buffer, int offset, int count)
 123                 {
 124                         if (ignore_errors) {
 125                                 try {
 126                                         stream.Write (buffer, offset, count);
 127                                 } catch { }
 128                         } else {
 129                                 stream.Write (buffer, offset, count);
 130                         }
 131                 }
 132
 133                 public override void Write (byte [] buffer, int offset, int count)
 134                 {
 135                         if (disposed)
 136                                 throw new ObjectDisposedException (GetType ().ToString ());
 137
 138                         byte [] bytes = null;
 139                         MemoryStream ms = GetHeaders (false);
 140                         bool chunked = response.SendChunked;
 141                         if (ms != null) {
 142                                 long start = ms.Position; // After the possible preamble for the encoding
 143                                 ms.Position = ms.Length;
 144                                 if (chunked) {
 145                                         bytes = GetChunkSizeBytes (count, false);
 146                                         ms.Write (bytes, 0, bytes.Length);
 147                                 }
 148
 149                                 int new_count = Math.Min (count, 16384 - (int) ms.Position + (int) start);
 150                                 ms.Write (buffer, offset, new_count);
 151                                 count -= new_count;
 152                                 offset += new_count;
 153                                 InternalWrite (ms.GetBuffer (), (int) start, (int) (ms.Length - start));
 154                                 ms.SetLength (0);
 155                                 ms.Capacity = 0; // 'dispose' the buffer in ms.
 156                         } else if (chunked) {
 157                                 bytes = GetChunkSizeBytes (count, false);
 158                                 InternalWrite (bytes, 0, bytes.Length);
 159                         }
 160
 161                         if (count > 0)
 162                                 InternalWrite (buffer, offset, count);
 163                         if (chunked)
 164                                 InternalWrite (crlf, 0, 2);
 165                 }
 166
 167                 public override IAsyncResult BeginWrite (byte [] buffer, int offset, int count,
 168                                                         AsyncCallback cback, object state)
 169                 {
 170                         if (disposed)
 171                                 throw new ObjectDisposedException (GetType ().ToString ());
 172
 173                         byte [] bytes = null;
 174                         MemoryStream ms = GetHeaders (false);
 175                         bool chunked = response.SendChunked;
 176                         if (ms != null) {
 177                                 long start = ms.Position;
 178                                 ms.Position = ms.Length;
 179                                 if (chunked) {
 180                                         bytes = GetChunkSizeBytes (count, false);
 181                                         ms.Write (bytes, 0, bytes.Length);
 182                                 }
 183                                 ms.Write (buffer, offset, count);
 184                                 buffer = ms.GetBuffer ();
 185                                 offset = (int) start;
 186                                 count = (int) (ms.Position - start);
 187                         } else if (chunked) {
 188                                 bytes = GetChunkSizeBytes (count, false);
 189                                 InternalWrite (bytes, 0, bytes.Length);
 190                         }
 191
 192                         return stream.BeginWrite (buffer, offset, count, cback, state);
 193                 }
 194
 195                 public override void EndWrite (IAsyncResult ares)
 196                 {
 197                         if (disposed)
 198                                 throw new ObjectDisposedException (GetType ().ToString ());
 199
 200                         if (ignore_errors) {
 201                                 try {
 202                                         stream.EndWrite (ares);
 203                                         if (response.SendChunked)
 204                                                 stream.Write (crlf, 0, 2);
 205                                 } catch { }
 206                         } else {
 207                                 stream.EndWrite (ares);
 208                                 if (response.SendChunked)
 209                                         stream.Write (crlf, 0, 2);
 210                         }
 211                 }
 212
 213                 public override int Read ([In,Out] byte[] buffer, int offset, int count)
 214                 {
 215                         throw new NotSupportedException ();
 216                 }
 217
 218                 public override IAsyncResult BeginRead (byte [] buffer, int offset, int count,
 219                                                         AsyncCallback cback, object state)
 220                 {
 221                         throw new NotSupportedException ();
 222                 }
 223
 224                 public override int EndRead (IAsyncResult ares)
 225                 {
 226                         throw new NotSupportedException ();
 227                 }
 228
 229                 public override long Seek (long offset, SeekOrigin origin)
 230                 {
 231                         throw new NotSupportedException ();
 232                 }
 233
 234                 public override void SetLength (long value)
 235                 {
 236                         throw new NotSupportedException ();
 237                 }
 238         }
 239 }
 240 #endif
 241