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