mcs/class/System/System.Net/WebConnectionStream.cs

   1 //
   2 // System.Net.WebConnectionStream
   3 //
   4 // Authors:
   5 //      Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //
   7 // (C) 2003 Ximian, Inc (http://www.ximian.com)
   8 // (C) 2004 Novell, Inc (http://www.novell.com)
   9 //
  10
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using System.IO;
  33 using System.Text;
  34 using System.Threading;
  35
  36 namespace System.Net
  37 {
  38         class WebConnectionStream : Stream
  39         {
  40                 static byte [] crlf = new byte [] { 13, 10 };
  41                 bool isRead;
  42                 WebConnection cnc;
  43                 HttpWebRequest request;
  44                 byte [] readBuffer;
  45                 int readBufferOffset;
  46                 int readBufferSize;
  47                 int stream_length; // -1 when CL not present
  48                 int contentLength;
  49                 int totalRead;
  50                 internal long totalWritten;
  51                 bool nextReadCalled;
  52                 int pendingReads;
  53                 int pendingWrites;
  54                 ManualResetEvent pending;
  55                 bool allowBuffering;
  56                 bool sendChunked;
  57                 MemoryStream writeBuffer;
  58                 bool requestWritten;
  59                 byte [] headers;
  60                 bool disposed;
  61                 bool headersSent;
  62                 object locker = new object ();
  63                 bool initRead;
  64                 bool read_eof;
  65                 bool complete_request_written;
  66                 int read_timeout;
  67                 int write_timeout;
  68                 AsyncCallback cb_wrapper; // Calls to ReadCallbackWrapper or WriteCallbacWrapper
  69                 internal bool IgnoreIOErrors;
  70
  71                 public WebConnectionStream (WebConnection cnc)
  72                 {
  73                         isRead = true;
  74                         cb_wrapper = new AsyncCallback (ReadCallbackWrapper);
  75                         pending = new ManualResetEvent (true);
  76                         this.request = cnc.Data.request;
  77                         read_timeout = request.ReadWriteTimeout;
  78                         write_timeout = read_timeout;
  79                         this.cnc = cnc;
  80                         string contentType = cnc.Data.Headers ["Transfer-Encoding"];
  81                         bool chunkedRead = (contentType != null && contentType.IndexOf ("chunked", StringComparison.OrdinalIgnoreCase) != -1);
  82                         string clength = cnc.Data.Headers ["Content-Length"];
  83                         if (!chunkedRead && clength != null && clength != "") {
  84                                 try {
  85                                         contentLength = Int32.Parse (clength);
  86                                         if (contentLength == 0 && !IsNtlmAuth ()) {
  87                                                 ReadAll ();
  88                                         }
  89                                 } catch {
  90                                         contentLength = Int32.MaxValue;
  91                                 }
  92                         } else {
  93                                 contentLength = Int32.MaxValue;
  94                         }
  95
  96                         // Negative numbers?
  97                         if (!Int32.TryParse (clength, out stream_length))
  98                                 stream_length = -1;
  99                 }
 100
 101                 public WebConnectionStream (WebConnection cnc, HttpWebRequest request)
 102                 {
 103                         read_timeout = request.ReadWriteTimeout;
 104                         write_timeout = read_timeout;
 105                         isRead = false;
 106                         cb_wrapper = new AsyncCallback (WriteCallbackWrapper);
 107                         this.cnc = cnc;
 108                         this.request = request;
 109                         allowBuffering = request.InternalAllowBuffering;
 110                         sendChunked = request.SendChunked;
 111                         if (sendChunked)
 112                                 pending = new ManualResetEvent (true);
 113                         else if (allowBuffering)
 114                                 writeBuffer = new MemoryStream ();
 115                 }
 116
 117                 bool IsNtlmAuth ()
 118                 {
 119                         bool isProxy = (request.Proxy != null && !request.Proxy.IsBypassed (request.Address));
 120                         string header_name = (isProxy) ? "Proxy-Authenticate" : "WWW-Authenticate";
 121                         string authHeader = cnc.Data.Headers [header_name];
 122                         return (authHeader != null && authHeader.IndexOf ("NTLM", StringComparison.Ordinal) != -1);
 123                 }
 124
 125                 internal void CheckResponseInBuffer ()
 126                 {
 127                         if (contentLength > 0 && (readBufferSize - readBufferOffset) >= contentLength) {
 128                                 if (!IsNtlmAuth ())
 129                                         ReadAll ();
 130                         }
 131                 }
 132
 133                 internal HttpWebRequest Request {
 134                         get { return request; }
 135                 }
 136
 137                 internal WebConnection Connection {
 138                         get { return cnc; }
 139                 }
 140                 public override bool CanTimeout {
 141                         get { return true; }
 142                 }
 143
 144                 public override int ReadTimeout {
 145                         get {
 146                                 return read_timeout;
 147                         }
 148
 149                         set {
 150                                 if (value < -1)
 151                                         throw new ArgumentOutOfRangeException ("value");
 152                                 read_timeout = value;
 153                         }
 154                 }
 155
 156                 public override int WriteTimeout {
 157                         get {
 158                                 return write_timeout;
 159                         }
 160
 161                         set {
 162                                 if (value < -1)
 163                                         throw new ArgumentOutOfRangeException ("value");
 164                                 write_timeout = value;
 165                         }
 166                 }
 167
 168                 internal bool CompleteRequestWritten {
 169                         get { return complete_request_written; }
 170                 }
 171
 172                 internal bool SendChunked {
 173                         set { sendChunked = value; }
 174                 }
 175
 176                 internal byte [] ReadBuffer {
 177                         set { readBuffer = value; }
 178                 }
 179
 180                 internal int ReadBufferOffset {
 181                         set { readBufferOffset = value;}
 182                 }
 183
 184                 internal int ReadBufferSize {
 185                         set { readBufferSize = value; }
 186                 }
 187
 188                 internal byte[] WriteBuffer {
 189                         get { return writeBuffer.GetBuffer (); }
 190                 }
 191
 192                 internal int WriteBufferLength {
 193                         get { return writeBuffer != null ? (int) writeBuffer.Length : (-1); }
 194                 }
 195
 196                 internal void ForceCompletion ()
 197                 {
 198                         if (!nextReadCalled) {
 199                                 if (contentLength == Int32.MaxValue)
 200                                         contentLength = 0;
 201                                 nextReadCalled = true;
 202                                 cnc.NextRead ();
 203                         }
 204                 }
 205
 206                 internal void CheckComplete ()
 207                 {
 208                         bool nrc = nextReadCalled;
 209                         if (!nrc && readBufferSize - readBufferOffset == contentLength) {
 210                                 nextReadCalled = true;
 211                                 cnc.NextRead ();
 212                         }
 213                 }
 214
 215                 internal void ReadAll ()
 216                 {
 217                         if (!isRead || read_eof || totalRead >= contentLength || nextReadCalled) {
 218                                 if (isRead && !nextReadCalled) {
 219                                         nextReadCalled = true;
 220                                         cnc.NextRead ();
 221                                 }
 222                                 return;
 223                         }
 224
 225                         pending.WaitOne ();
 226                         lock (locker) {
 227                                 if (totalRead >= contentLength)
 228                                         return;
 229
 230                                 byte [] b = null;
 231                                 int diff = readBufferSize - readBufferOffset;
 232                                 int new_size;
 233
 234                                 if (contentLength == Int32.MaxValue) {
 235                                         MemoryStream ms = new MemoryStream ();
 236                                         byte [] buffer = null;
 237                                         if (readBuffer != null && diff > 0) {
 238                                                 ms.Write (readBuffer, readBufferOffset, diff);
 239                                                 if (readBufferSize >= 8192)
 240                                                         buffer = readBuffer;
 241                                         }
 242
 243                                         if (buffer == null)
 244                                                 buffer = new byte [8192];
 245
 246                                         int read;
 247                                         while ((read = cnc.Read (request, buffer, 0, buffer.Length)) != 0)
 248                                                 ms.Write (buffer, 0, read);
 249
 250                                         b = ms.GetBuffer ();
 251                                         new_size = (int) ms.Length;
 252                                         contentLength = new_size;
 253                                 } else {
 254                                         new_size = contentLength - totalRead;
 255                                         b = new byte [new_size];
 256                                         if (readBuffer != null && diff > 0) {
 257                                                 if (diff > new_size)
 258                                                         diff = new_size;
 259
 260                                                 Buffer.BlockCopy (readBuffer, readBufferOffset, b, 0, diff);
 261                                         }
 262
 263                                         int remaining = new_size - diff;
 264                                         int r = -1;
 265                                         while (remaining > 0 && r != 0) {
 266                                                 r = cnc.Read (request, b, diff, remaining);
 267                                                 remaining -= r;
 268                                                 diff += r;
 269                                         }
 270                                 }
 271
 272                                 readBuffer = b;
 273                                 readBufferOffset = 0;
 274                                 readBufferSize = new_size;
 275                                 totalRead = 0;
 276                                 nextReadCalled = true;
 277                         }
 278
 279                         cnc.NextRead ();
 280                 }
 281
 282                 void WriteCallbackWrapper (IAsyncResult r)
 283                 {
 284                         WebAsyncResult result = r as WebAsyncResult;
 285                         if (result != null && result.AsyncWriteAll)
 286                                 return;
 287
 288                         if (r.AsyncState != null) {
 289                                 result = (WebAsyncResult) r.AsyncState;
 290                                 result.InnerAsyncResult = r;
 291                                 result.DoCallback ();
 292                         } else {
 293                                 try {
 294                                         EndWrite (r);
 295                                 } catch {
 296                                 }
 297                         }
 298                 }
 299
 300                 void ReadCallbackWrapper (IAsyncResult r)
 301                 {
 302                         WebAsyncResult result;
 303                         if (r.AsyncState != null) {
 304                                 result = (WebAsyncResult) r.AsyncState;
 305                                 result.InnerAsyncResult = r;
 306                                 result.DoCallback ();
 307                         } else {
 308                                 try {
 309                                         EndRead (r);
 310                                 } catch {
 311                                 }
 312                         }
 313                 }
 314
 315                 public override int Read (byte [] buffer, int offset, int size)
 316                 {
 317                         AsyncCallback cb = cb_wrapper;
 318                         WebAsyncResult res = (WebAsyncResult) BeginRead (buffer, offset, size, cb, null);
 319                         if (!res.IsCompleted && !res.WaitUntilComplete (ReadTimeout, false)) {
 320                                 nextReadCalled = true;
 321                                 cnc.Close (true);
 322                                 throw new WebException ("The operation has timed out.", WebExceptionStatus.Timeout);
 323                         }
 324
 325                         return EndRead (res);
 326                 }
 327
 328                 public override IAsyncResult BeginRead (byte [] buffer, int offset, int size,
 329                                                         AsyncCallback cb, object state)
 330                 {
 331                         if (!isRead)
 332                                 throw new NotSupportedException ("this stream does not allow reading");
 333
 334                         if (buffer == null)
 335                                 throw new ArgumentNullException ("buffer");
 336
 337                         int length = buffer.Length;
 338                         if (offset < 0 || length < offset)
 339                                 throw new ArgumentOutOfRangeException ("offset");
 340                         if (size < 0 || (length - offset) < size)
 341                                 throw new ArgumentOutOfRangeException ("size");
 342
 343                         lock (locker) {
 344                                 pendingReads++;
 345                                 pending.Reset ();
 346                         }
 347
 348                         WebAsyncResult result = new WebAsyncResult (cb, state, buffer, offset, size);
 349                         if (totalRead >= contentLength) {
 350                                 result.SetCompleted (true, -1);
 351                                 result.DoCallback ();
 352                                 return result;
 353                         }
 354
 355                         int remaining = readBufferSize - readBufferOffset;
 356                         if (remaining > 0) {
 357                                 int copy = (remaining > size) ? size : remaining;
 358                                 Buffer.BlockCopy (readBuffer, readBufferOffset, buffer, offset, copy);
 359                                 readBufferOffset += copy;
 360                                 offset += copy;
 361                                 size -= copy;
 362                                 totalRead += copy;
 363                                 if (size == 0 || totalRead >= contentLength) {
 364                                         result.SetCompleted (true, copy);
 365                                         result.DoCallback ();
 366                                         return result;
 367                                 }
 368                                 result.NBytes = copy;
 369                         }
 370
 371                         if (cb != null)
 372                                 cb = cb_wrapper;
 373
 374                         if (contentLength != Int32.MaxValue && contentLength - totalRead < size)
 375                                 size = contentLength - totalRead;
 376
 377                         if (!read_eof) {
 378                                 result.InnerAsyncResult = cnc.BeginRead (request, buffer, offset, size, cb, result);
 379                         } else {
 380                                 result.SetCompleted (true, result.NBytes);
 381                                 result.DoCallback ();
 382                         }
 383                         return result;
 384                 }
 385
 386                 public override int EndRead (IAsyncResult r)
 387                 {
 388                         WebAsyncResult result = (WebAsyncResult) r;
 389                         if (result.EndCalled) {
 390                                 int xx = result.NBytes;
 391                                 return (xx >= 0) ? xx : 0;
 392                         }
 393
 394                         result.EndCalled = true;
 395
 396                         if (!result.IsCompleted) {
 397                                 int nbytes = -1;
 398                                 try {
 399                                         nbytes = cnc.EndRead (request, result);
 400                                 } catch (Exception exc) {
 401                                         lock (locker) {
 402                                                 pendingReads--;
 403                                                 if (pendingReads == 0)
 404                                                         pending.Set ();
 405                                         }
 406
 407                                         nextReadCalled = true;
 408                                         cnc.Close (true);
 409                                         result.SetCompleted (false, exc);
 410                                         result.DoCallback ();
 411                                         throw;
 412                                 }
 413
 414                                 if (nbytes < 0) {
 415                                         nbytes = 0;
 416                                         read_eof = true;
 417                                 }
 418
 419                                 totalRead += nbytes;
 420                                 result.SetCompleted (false, nbytes + result.NBytes);
 421                                 result.DoCallback ();
 422                                 if (nbytes == 0)
 423                                         contentLength = totalRead;
 424                         }
 425
 426                         lock (locker) {
 427                                 pendingReads--;
 428                                 if (pendingReads == 0)
 429                                         pending.Set ();
 430                         }
 431
 432                         if (totalRead >= contentLength && !nextReadCalled)
 433                                 ReadAll ();
 434
 435                         int nb = result.NBytes;
 436                         return (nb >= 0) ? nb : 0;
 437                 }
 438
 439                 void WriteRequestAsyncCB (IAsyncResult r)
 440                 {
 441                         WebAsyncResult result = (WebAsyncResult) r.AsyncState;
 442                         try {
 443                                 cnc.EndWrite2 (request, r);
 444                                 result.SetCompleted (false, 0);
 445                                 if (!initRead) {
 446                                         initRead = true;
 447                                         WebConnection.InitRead (cnc);
 448                                 }
 449                         } catch (Exception e) {
 450                                 KillBuffer ();
 451                                 nextReadCalled = true;
 452                                 cnc.Close (true);
 453                                 if (e is System.Net.Sockets.SocketException)
 454                                         e = new IOException ("Error writing request", e);
 455                                 result.SetCompleted (false, e);
 456                         }
 457                         complete_request_written = true;
 458                         result.DoCallback ();
 459                 }
 460
 461                 public override IAsyncResult BeginWrite (byte [] buffer, int offset, int size,
 462                                                         AsyncCallback cb, object state)
 463                 {
 464                         if (request.Aborted)
 465                                 throw new WebException ("The request was canceled.", null, WebExceptionStatus.RequestCanceled);
 466
 467                         if (isRead)
 468                                 throw new NotSupportedException ("this stream does not allow writing");
 469
 470                         if (buffer == null)
 471                                 throw new ArgumentNullException ("buffer");
 472
 473                         int length = buffer.Length;
 474                         if (offset < 0 || length < offset)
 475                                 throw new ArgumentOutOfRangeException ("offset");
 476                         if (size < 0 || (length - offset) < size)
 477                                 throw new ArgumentOutOfRangeException ("size");
 478
 479                         if (sendChunked) {
 480                                 lock (locker) {
 481                                         pendingWrites++;
 482                                         pending.Reset ();
 483                                 }
 484                         }
 485
 486                         WebAsyncResult result = new WebAsyncResult (cb, state);
 487                         if (!sendChunked)
 488                                 CheckWriteOverflow (request.ContentLength, totalWritten, size);
 489                         if (allowBuffering && !sendChunked) {
 490                                 if (writeBuffer == null)
 491                                         writeBuffer = new MemoryStream ();
 492                                 writeBuffer.Write (buffer, offset, size);
 493                                 totalWritten += size;
 494                                 if (request.ContentLength > 0 && totalWritten == request.ContentLength) {
 495                                         try {
 496                                                 result.AsyncWriteAll = true;
 497                                                 result.InnerAsyncResult = WriteRequestAsync (new AsyncCallback (WriteRequestAsyncCB), result);
 498                                                 if (result.InnerAsyncResult == null) {
 499                                                         if (!result.IsCompleted)
 500                                                                 result.SetCompleted (true, 0);
 501                                                         result.DoCallback ();
 502                                                 }
 503                                         } catch (Exception exc) {
 504                                                 result.SetCompleted (true, exc);
 505                                                 result.DoCallback ();
 506                                         }
 507                                 } else {
 508                                         result.SetCompleted (true, 0);
 509                                         result.DoCallback ();
 510                                 }
 511                                 return result;
 512                         }
 513
 514                         AsyncCallback callback = null;
 515                         if (cb != null)
 516                                 callback = cb_wrapper;
 517
 518                         if (sendChunked) {
 519                                 WriteRequest ();
 520
 521                                 string cSize = String.Format ("{0:X}\r\n", size);
 522                                 byte [] head = Encoding.ASCII.GetBytes (cSize);
 523                                 int chunkSize = 2 + size + head.Length;
 524                                 byte [] newBuffer = new byte [chunkSize];
 525                                 Buffer.BlockCopy (head, 0, newBuffer, 0, head.Length);
 526                                 Buffer.BlockCopy (buffer, offset, newBuffer, head.Length, size);
 527                                 Buffer.BlockCopy (crlf, 0, newBuffer, head.Length + size, crlf.Length);
 528
 529                                 buffer = newBuffer;
 530                                 offset = 0;
 531                                 size = chunkSize;
 532                         }
 533
 534                         try {
 535                                 result.InnerAsyncResult = cnc.BeginWrite (request, buffer, offset, size, callback, result);
 536                         } catch (Exception) {
 537                                 if (!IgnoreIOErrors)
 538                                         throw;
 539                                 result.SetCompleted (true, 0);
 540                                 result.DoCallback ();
 541                         }
 542                         totalWritten += size;
 543                         return result;
 544                 }
 545
 546                 void CheckWriteOverflow (long contentLength, long totalWritten, long size)
 547                 {
 548                         if (contentLength == -1)
 549                                 return;
 550
 551                         long avail = contentLength - totalWritten;
 552                         if (size > avail) {
 553                                 KillBuffer ();
 554                                 nextReadCalled = true;
 555                                 cnc.Close (true);
 556                                 throw new ProtocolViolationException (
 557                                         "The number of bytes to be written is greater than " +
 558                                         "the specified ContentLength.");
 559                         }
 560                 }
 561
 562                 public override void EndWrite (IAsyncResult r)
 563                 {
 564                         if (r == null)
 565                                 throw new ArgumentNullException ("r");
 566
 567                         WebAsyncResult result = r as WebAsyncResult;
 568                         if (result == null)
 569                                 throw new ArgumentException ("Invalid IAsyncResult");
 570
 571                         if (result.EndCalled)
 572                                 return;
 573
 574                         result.EndCalled = true;
 575                         if (result.AsyncWriteAll) {
 576                                 result.WaitUntilComplete ();
 577                                 if (result.GotException)
 578                                         throw result.Exception;
 579                                 return;
 580                         }
 581
 582                         if (allowBuffering && !sendChunked)
 583                                 return;
 584
 585                         if (result.GotException)
 586                                 throw result.Exception;
 587
 588                         try {
 589                                 cnc.EndWrite2 (request, result.InnerAsyncResult);
 590                                 result.SetCompleted (false, 0);
 591                                 result.DoCallback ();
 592                         } catch (Exception e) {
 593                                 if (IgnoreIOErrors)
 594                                         result.SetCompleted (false, 0);
 595                                 else
 596                                         result.SetCompleted (false, e);
 597                                 result.DoCallback ();
 598                                 if (!IgnoreIOErrors)
 599                                         throw;
 600                         } finally {
 601                                 if (sendChunked) {
 602                                         lock (locker) {
 603                                                 pendingWrites--;
 604                                                 if (pendingWrites == 0)
 605                                                         pending.Set ();
 606                                         }
 607                                 }
 608                         }
 609                 }
 610
 611                 public override void Write (byte [] buffer, int offset, int size)
 612                 {
 613                         AsyncCallback cb = cb_wrapper;
 614                         WebAsyncResult res = (WebAsyncResult) BeginWrite (buffer, offset, size, cb, null);
 615                         if (!res.IsCompleted && !res.WaitUntilComplete (WriteTimeout, false)) {
 616                                 KillBuffer ();
 617                                 nextReadCalled = true;
 618                                 cnc.Close (true);
 619                                 throw new IOException ("Write timed out.");
 620                         }
 621
 622                         EndWrite (res);
 623                 }
 624
 625                 public override void Flush ()
 626                 {
 627                 }
 628
 629                 internal void SetHeaders (byte [] buffer)
 630                 {
 631                         if (headersSent)
 632                                 return;
 633
 634                         headers = buffer;
 635                         long cl = request.ContentLength;
 636                         string method = request.Method;
 637                         bool no_writestream = (method == "GET" || method == "CONNECT" || method == "HEAD" ||
 638                                                 method == "TRACE");
 639                         bool webdav = (method == "PROPFIND" || method == "PROPPATCH" || method == "MKCOL" ||
 640                                        method == "COPY" || method == "MOVE" || method == "LOCK" ||
 641                                        method == "UNLOCK");
 642                         if (sendChunked || cl > -1 || no_writestream || webdav) {
 643                                 WriteHeaders ();
 644                                 if (!initRead) {
 645                                         initRead = true;
 646                                         WebConnection.InitRead (cnc);
 647                                 }
 648                                 if (!sendChunked && cl == 0)
 649                                         requestWritten = true;
 650                         }
 651                 }
 652
 653                 internal bool RequestWritten {
 654                         get { return requestWritten; }
 655                 }
 656
 657                 IAsyncResult WriteRequestAsync (AsyncCallback cb, object state)
 658                 {
 659                         requestWritten = true;
 660                         byte [] bytes = writeBuffer.GetBuffer ();
 661                         int length = (int) writeBuffer.Length;
 662                         // Headers already written to the stream
 663                         return (length > 0) ? cnc.BeginWrite (request, bytes, 0, length, cb, state) : null;
 664                 }
 665
 666                 void WriteHeaders ()
 667                 {
 668                         if (headersSent)
 669                                 return;
 670
 671                         headersSent = true;
 672                         string err_msg = null;
 673                         if (!cnc.Write (request, headers, 0, headers.Length, ref err_msg))
 674                                 throw new WebException ("Error writing request: " + err_msg, null, WebExceptionStatus.SendFailure, null);
 675                 }
 676
 677                 internal void WriteRequest ()
 678                 {
 679                         if (requestWritten)
 680                                 return;
 681
 682                         requestWritten = true;
 683                         if (sendChunked)
 684                                 return;
 685
 686                         if (!allowBuffering || writeBuffer == null)
 687                                 return;
 688
 689                         byte [] bytes = writeBuffer.GetBuffer ();
 690                         int length = (int) writeBuffer.Length;
 691                         if (request.ContentLength != -1 && request.ContentLength < length) {
 692                                 nextReadCalled = true;
 693                                 cnc.Close (true);
 694                                 throw new WebException ("Specified Content-Length is less than the number of bytes to write", null,
 695                                                         WebExceptionStatus.ServerProtocolViolation, null);
 696                         }
 697
 698                         if (!headersSent) {
 699                                 string method = request.Method;
 700                                 bool no_writestream = (method == "GET" || method == "CONNECT" || method == "HEAD" ||
 701                                                         method == "TRACE");
 702                                 if (!no_writestream)
 703                                         request.InternalContentLength = length;
 704                                 request.SendRequestHeaders (true);
 705                         }
 706                         WriteHeaders ();
 707                         if (cnc.Data.StatusCode != 0 && cnc.Data.StatusCode != 100)
 708                                 return;
 709
 710                         IAsyncResult result = null;
 711                         if (length > 0)
 712                                 result = cnc.BeginWrite (request, bytes, 0, length, null, null);
 713
 714                         if (!initRead) {
 715                                 initRead = true;
 716                                 WebConnection.InitRead (cnc);
 717                         }
 718
 719                         if (length > 0)
 720                                 complete_request_written = cnc.EndWrite (request, result);
 721                         else
 722                                 complete_request_written = true;
 723                 }
 724
 725                 internal void InternalClose ()
 726                 {
 727                         disposed = true;
 728                 }
 729
 730                 public override void Close ()
 731                 {
 732                         if (sendChunked) {
 733                                 if (disposed)
 734                                         return;
 735                                 disposed = true;
 736                                 pending.WaitOne ();
 737                                 byte [] chunk = Encoding.ASCII.GetBytes ("0\r\n\r\n");
 738                                 string err_msg = null;
 739                                 cnc.Write (request, chunk, 0, chunk.Length, ref err_msg);
 740                                 return;
 741                         }
 742
 743                         if (isRead) {
 744                                 if (!nextReadCalled) {
 745                                         CheckComplete ();
 746                                         // If we have not read all the contents
 747                                         if (!nextReadCalled) {
 748                                                 nextReadCalled = true;
 749                                                 cnc.Close (true);
 750                                         }
 751                                 }
 752                                 return;
 753                         } else if (!allowBuffering) {
 754                                 complete_request_written = true;
 755                                 if (!initRead) {
 756                                         initRead = true;
 757                                         WebConnection.InitRead (cnc);
 758                                 }
 759                                 return;
 760                         }
 761
 762                         if (disposed || requestWritten)
 763                                 return;
 764
 765                         long length = request.ContentLength;
 766
 767                         if (!sendChunked && length != -1 && totalWritten != length) {
 768                                 IOException io = new IOException ("Cannot close the stream until all bytes are written");
 769                                 nextReadCalled = true;
 770                                 cnc.Close (true);
 771                                 throw new WebException ("Request was cancelled.", io, WebExceptionStatus.RequestCanceled);
 772                         }
 773
 774                         // Commented out the next line to fix xamarin bug #1512
 775                         //WriteRequest ();
 776                         disposed = true;
 777                 }
 778
 779                 internal void KillBuffer ()
 780                 {
 781                         writeBuffer = null;
 782                 }
 783
 784                 public override long Seek (long a, SeekOrigin b)
 785                 {
 786                         throw new NotSupportedException ();
 787                 }
 788
 789                 public override void SetLength (long a)
 790                 {
 791                         throw new NotSupportedException ();
 792                 }
 793
 794                 public override bool CanSeek {
 795                         get { return false; }
 796                 }
 797
 798                 public override bool CanRead {
 799                         get { return !disposed && isRead; }
 800                 }
 801
 802                 public override bool CanWrite {
 803                         get { return !disposed && !isRead; }
 804                 }
 805
 806                 public override long Length {
 807                         get {
 808                                 if (!isRead)
 809                                         throw new NotSupportedException ();
 810                                 return stream_length;
 811                         }
 812                 }
 813
 814                 public override long Position {
 815                         get { throw new NotSupportedException (); }
 816                         set { throw new NotSupportedException (); }
 817                 }
 818         }
 819 }
 820