//
// System.Net.RequestStream
//
// Author:
// Gonzalo Paniagua Javier (gonzalo@novell.com)
//
// Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#if NET_2_0
using System.IO;
using System.Net.Sockets;
using System.Runtime.InteropServices;
namespace System.Net{
class RequestStream : Stream
{
byte [] buffer;
int offset;
int length;
long remaining_body;
bool disposed;
Stream stream;
internal RequestStream (Stream stream, byte [] buffer, int offset, int length)
: this (stream, buffer, offset, length, -1)
{
}
internal RequestStream (Stream stream, byte [] buffer, int offset, int length, long contentlength)
{
this.stream = stream;
this.buffer = buffer;
this.offset = offset;
this.length = length;
this.remaining_body = contentlength;
}
public override bool CanRead {
get { return true; }
}
public override bool CanSeek {
get { return false; }
}
public override bool CanWrite {
get { return false; }
}
public override long Length {
get { throw new NotSupportedException (); }
}
public override long Position {
get { throw new NotSupportedException (); }
set { throw new NotSupportedException (); }
}
public override void Close ()
{
disposed = true;
}
public override void Flush ()
{
}
// Returns 0 if we can keep reading from the base stream,
// > 0 if we read something from the buffer.
// -1 if we had a content length set and we finished reading that many bytes.
int FillFromBuffer (byte [] buffer, int off, int count)
{
if (buffer == null)
throw new ArgumentNullException ("buffer");
if (off < 0)
throw new ArgumentOutOfRangeException ("offset", "< 0");
if (count < 0)
throw new ArgumentOutOfRangeException ("count", "< 0");
int len = buffer.Length;
if (off > len)
throw new ArgumentException ("destination offset is beyond array size");
if (off > len - count)
throw new ArgumentException ("Reading would overrun buffer");
if (this.remaining_body == 0)
return -1;
if (this.length == 0)
return 0;
int size = Math.Min (this.length, count);
if (this.remaining_body > 0)
size = (int) Math.Min (size, this.remaining_body);
if (this.offset > this.buffer.Length - size) {
size = Math.Min (size, this.buffer.Length - this.offset);
}
if (size == 0)
return 0;
Buffer.BlockCopy (this.buffer, this.offset, buffer, off, size);
this.offset += size;
this.length -= size;
if (this.remaining_body > 0)
remaining_body -= size;
return size;
}
public override int Read ([In,Out] byte[] buffer, int offset, int count)
{
if (disposed)
throw new ObjectDisposedException (typeof (RequestStream).ToString ());
// Call FillFromBuffer to check for buffer boundaries even when remaining_body is 0
int nread = FillFromBuffer (buffer, offset, count);
if (nread == -1) { // No more bytes available (Content-Length)
return 0;
} else if (nread > 0) {
return nread;
}
nread = stream.Read (buffer, offset, count);
if (nread > 0 && remaining_body > 0)
remaining_body -= nread;
return nread;
}
public override IAsyncResult BeginRead (byte [] buffer, int offset, int count,
AsyncCallback cback, object state)
{
if (disposed)
throw new ObjectDisposedException (typeof (RequestStream).ToString ());
int nread = FillFromBuffer (buffer, offset, count);
if (nread > 0 || nread == -1) {
HttpStreamAsyncResult ares = new HttpStreamAsyncResult ();
ares.Buffer = buffer;
ares.Offset = offset;
ares.Count = count;
ares.Callback = cback;
ares.State = state;
ares.SynchRead = nread;
ares.Complete ();
return ares;
}
// Avoid reading past the end of the request to allow
// for HTTP pipelining
if (remaining_body >= 0 && count > remaining_body)
count = (int) Math.Min (Int32.MaxValue, remaining_body);
return stream.BeginRead (buffer, offset, count, cback, state);
}
public override int EndRead (IAsyncResult ares)
{
if (disposed)
throw new ObjectDisposedException (typeof (RequestStream).ToString ());
if (ares == null)
throw new ArgumentNullException ("async_result");
if (ares is HttpStreamAsyncResult) {
HttpStreamAsyncResult r = (HttpStreamAsyncResult) ares;
if (!ares.IsCompleted)
ares.AsyncWaitHandle.WaitOne ();
return r.SynchRead;
}
// Close on exception?
int nread = stream.EndRead (ares);
if (remaining_body > 0 && nread > 0)
remaining_body -= nread;
return nread;
}
public override long Seek (long offset, SeekOrigin origin)
{
throw new NotSupportedException ();
}
public override void SetLength (long value)
{
throw new NotSupportedException ();
}
public override void Write (byte[] buffer, int offset, int count)
{
throw new NotSupportedException ();
}
public override IAsyncResult BeginWrite (byte [] buffer, int offset, int count,
AsyncCallback cback, object state)
{
throw new NotSupportedException ();
}
public override void EndWrite (IAsyncResult async_result)
{
throw new NotSupportedException ();
}
}
}
#endif
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