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//
// System.Net.ChunkedInputStream
//
// Authors:
// 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.
using System.IO;
using System.Net.Sockets;
using System.Runtime.InteropServices;
namespace System.Net {
class ChunkedInputStream : RequestStream {
bool disposed;
MonoChunkParser decoder;
HttpListenerContext context;
bool no_more_data;
class ReadBufferState {
public byte [] Buffer;
public int Offset;
public int Count;
public int InitialCount;
public HttpStreamAsyncResult Ares;
public ReadBufferState (byte [] buffer, int offset, int count,
HttpStreamAsyncResult ares)
{
Buffer = buffer;
Offset = offset;
Count = count;
InitialCount = count;
Ares = ares;
}
}
public ChunkedInputStream (HttpListenerContext context, Stream stream,
byte [] buffer, int offset, int length)
: base (stream, buffer, offset, length)
{
this.context = context;
WebHeaderCollection coll = (WebHeaderCollection) context.Request.Headers;
decoder = new MonoChunkParser (coll);
}
public MonoChunkParser Decoder {
get { return decoder; }
set { decoder = value; }
}
public override int Read ([In,Out] byte [] buffer, int offset, int count)
{
IAsyncResult ares = BeginRead (buffer, offset, count, null, null);
return EndRead (ares);
}
public override IAsyncResult BeginRead (byte [] buffer, int offset, int count,
AsyncCallback cback, object state)
{
if (disposed)
throw new ObjectDisposedException (GetType ().ToString ());
if (buffer == null)
throw new ArgumentNullException ("buffer");
int len = buffer.Length;
if (offset < 0 || offset > len)
throw new ArgumentOutOfRangeException ("offset exceeds the size of buffer");
if (count < 0 || offset > len - count)
throw new ArgumentOutOfRangeException ("offset+size exceeds the size of buffer");
HttpStreamAsyncResult ares = new HttpStreamAsyncResult ();
ares.Callback = cback;
ares.State = state;
if (no_more_data) {
ares.Complete ();
return ares;
}
int nread = decoder.Read (buffer, offset, count);
offset += nread;
count -= nread;
if (count == 0) {
// got all we wanted, no need to bother the decoder yet
ares.Count = nread;
ares.Complete ();
return ares;
}
if (!decoder.WantMore) {
no_more_data = nread == 0;
ares.Count = nread;
ares.Complete ();
return ares;
}
ares.Buffer = new byte [8192];
ares.Offset = 0;
ares.Count = 8192;
ReadBufferState rb = new ReadBufferState (buffer, offset, count, ares);
rb.InitialCount += nread;
base.BeginRead (ares.Buffer, ares.Offset, ares.Count, OnRead, rb);
return ares;
}
void OnRead (IAsyncResult base_ares)
{
ReadBufferState rb = (ReadBufferState) base_ares.AsyncState;
HttpStreamAsyncResult ares = rb.Ares;
try {
int nread = base.EndRead (base_ares);
decoder.Write (ares.Buffer, ares.Offset, nread);
nread = decoder.Read (rb.Buffer, rb.Offset, rb.Count);
rb.Offset += nread;
rb.Count -= nread;
if (rb.Count == 0 || !decoder.WantMore || nread == 0) {
no_more_data = !decoder.WantMore && nread == 0;
ares.Count = rb.InitialCount - rb.Count;
ares.Complete ();
return;
}
ares.Offset = 0;
ares.Count = Math.Min (8192, decoder.ChunkLeft + 6);
base.BeginRead (ares.Buffer, ares.Offset, ares.Count, OnRead, rb);
} catch (Exception e) {
context.Connection.SendError (e.Message, 400);
ares.Complete (e);
}
}
public override int EndRead (IAsyncResult ares)
{
if (disposed)
throw new ObjectDisposedException (GetType ().ToString ());
HttpStreamAsyncResult my_ares = ares as HttpStreamAsyncResult;
if (ares == null)
throw new ArgumentException ("Invalid IAsyncResult", "ares");
if (!ares.IsCompleted)
ares.AsyncWaitHandle.WaitOne ();
if (my_ares.Error != null)
throw new HttpListenerException (400, "I/O operation aborted: " + my_ares.Error.Message);
return my_ares.Count;
}
public override void Close ()
{
if (!disposed) {
disposed = true;
base.Close ();
}
}
}
}
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