mcs/class/System/System.Net/RequestStream.cs

   1 //
   2 // System.Net.RequestStream
   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 #if NET_2_0
  29 using System.IO;
  30 using System.Net.Sockets;
  31 using System.Runtime.InteropServices;
  32 namespace System.Net {
  33         class RequestStream : Stream
  34         {
  35                 byte [] buffer;
  36                 int offset;
  37                 int length;
  38                 long remaining_body;
  39                 bool disposed;
  40                 Stream stream;
  41
  42                 internal RequestStream (Stream stream, byte [] buffer, int offset, int length)
  43                         : this (stream, buffer, offset, length, -1)
  44                 {
  45                 }
  46
  47                 internal RequestStream (Stream stream, byte [] buffer, int offset, int length, long contentlength)
  48                 {
  49                         this.stream = stream;
  50                         this.buffer = buffer;
  51                         this.offset = offset;
  52                         this.length = length;
  53                         this.remaining_body = contentlength;
  54                 }
  55
  56                 public override bool CanRead {
  57                         get { return true; }
  58                 }
  59
  60                 public override bool CanSeek {
  61                         get { return false; }
  62                 }
  63
  64                 public override bool CanWrite {
  65                         get { return false; }
  66                 }
  67
  68                 public override long Length {
  69                         get { throw new NotSupportedException (); }
  70                 }
  71
  72                 public override long Position {
  73                         get { throw new NotSupportedException (); }
  74                         set { throw new NotSupportedException (); }
  75                 }
  76
  77
  78                 public override void Close ()
  79                 {
  80                         disposed = true;
  81                 }
  82
  83                 public override void Flush ()
  84                 {
  85                 }
  86
  87
  88                 // Returns 0 if we can keep reading from the base stream,
  89                 // > 0 if we read something from the buffer.
  90                 // -1 if we had a content length set and we finished reading that many bytes.
  91                 int FillFromBuffer (byte [] buffer, int off, int count)
  92                 {
  93                         if (buffer == null)
  94                                 throw new ArgumentNullException ("buffer");
  95                         if (off < 0)
  96                                 throw new ArgumentOutOfRangeException ("offset", "< 0");
  97                         if (count < 0)
  98                                 throw new ArgumentOutOfRangeException ("count", "< 0");
  99                         int len = buffer.Length;
 100                         if (off > len)
 101                                 throw new ArgumentException ("destination offset is beyond array size");
 102                         if (off > len - count)
 103                                 throw new ArgumentException ("Reading would overrun buffer");
 104
 105                         if (this.remaining_body == 0)
 106                                 return -1;
 107
 108                         if (this.length == 0)
 109                                 return 0;
 110
 111                         int size = Math.Min (this.length, count);
 112                         if (this.remaining_body > 0)
 113                                 size = (int) Math.Min (size, this.remaining_body);
 114
 115                         if (this.offset > this.buffer.Length - size) {
 116                                 size = Math.Min (size, this.buffer.Length - this.offset);
 117                         }
 118                         if (size == 0)
 119                                 return 0;
 120
 121                         Buffer.BlockCopy (this.buffer, this.offset, buffer, off, size);
 122                         this.offset += size;
 123                         this.length -= size;
 124                         if (this.remaining_body > 0)
 125                                 remaining_body -= size;
 126                         return size;
 127                 }
 128
 129                 public override int Read ([In,Out] byte[] buffer, int offset, int count)
 130                 {
 131                         if (disposed)
 132                                 throw new ObjectDisposedException (typeof (RequestStream).ToString ());
 133
 134                         // Call FillFromBuffer to check for buffer boundaries even when remaining_body is 0
 135                         int nread = FillFromBuffer (buffer, offset, count);
 136                         if (nread == -1) { // No more bytes available (Content-Length)
 137                                 return 0;
 138                         } else if (nread > 0) {
 139                                 return nread;
 140                         }
 141
 142                         nread = stream.Read (buffer, offset, count);
 143                         if (nread > 0 && remaining_body > 0)
 144                                 remaining_body -= nread;
 145                         return nread;
 146                 }
 147
 148                 public override IAsyncResult BeginRead (byte [] buffer, int offset, int count,
 149                                                         AsyncCallback cback, object state)
 150                 {
 151                         if (disposed)
 152                                 throw new ObjectDisposedException (typeof (RequestStream).ToString ());
 153
 154                         int nread = FillFromBuffer (buffer, offset, count);
 155                         if (nread > 0 || nread == -1) {
 156                                 HttpStreamAsyncResult ares = new HttpStreamAsyncResult ();
 157                                 ares.Buffer = buffer;
 158                                 ares.Offset = offset;
 159                                 ares.Count = count;
 160                                 ares.Callback = cback;
 161                                 ares.State = state;
 162                                 ares.SynchRead = nread;
 163                                 ares.Complete ();
 164                                 return ares;
 165                         }
 166
 167                         // Avoid reading past the end of the request to allow
 168                         // for HTTP pipelining
 169                         if (remaining_body >= 0 && count > remaining_body)
 170                                 count = (int) Math.Min (Int32.MaxValue, remaining_body);
 171                         return stream.BeginRead (buffer, offset, count, cback, state);
 172                 }
 173
 174                 public override int EndRead (IAsyncResult ares)
 175                 {
 176                         if (disposed)
 177                                 throw new ObjectDisposedException (typeof (RequestStream).ToString ());
 178
 179                         if (ares == null)
 180                                 throw new ArgumentNullException ("async_result");
 181
 182                         if (ares is HttpStreamAsyncResult) {
 183                                 HttpStreamAsyncResult r = (HttpStreamAsyncResult) ares;
 184                                 if (!ares.IsCompleted)
 185                                         ares.AsyncWaitHandle.WaitOne ();
 186                                 return r.SynchRead;
 187                         }
 188
 189                         // Close on exception?
 190                         int nread = stream.EndRead (ares);
 191                         if (remaining_body > 0 && nread > 0)
 192                                 remaining_body -= nread;
 193                         return nread;
 194                 }
 195
 196                 public override long Seek (long offset, SeekOrigin origin)
 197                 {
 198                         throw new NotSupportedException ();
 199                 }
 200
 201                 public override void SetLength (long value)
 202                 {
 203                         throw new NotSupportedException ();
 204                 }
 205
 206                 public override void Write (byte[] buffer, int offset, int count)
 207                 {
 208                         throw new NotSupportedException ();
 209                 }
 210
 211                 public override IAsyncResult BeginWrite (byte [] buffer, int offset, int count,
 212                                                         AsyncCallback cback, object state)
 213                 {
 214                         throw new NotSupportedException ();
 215                 }
 216
 217                 public override void EndWrite (IAsyncResult async_result)
 218                 {
 219                         throw new NotSupportedException ();
 220                 }
 221         }
 222 }
 223 #endif
 224