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