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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.ExceptionServices;
using System.Text;
using System.Threading.Tasks;
namespace SocketHttpListener.Net
{
// Licensed to the .NET Foundation under one or more agreements.
// See the LICENSE file in the project root for more information.
//
// System.Net.ResponseStream
//
// 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.
//
internal partial class HttpRequestStream : Stream
{
private byte[] _buffer;
private int _offset;
private int _length;
private long _remainingBody;
protected bool _closed;
private Stream _stream;
internal HttpRequestStream(Stream stream, byte[] buffer, int offset, int length)
: this(stream, buffer, offset, length, -1)
{
}
internal HttpRequestStream(Stream stream, byte[] buffer, int offset, int length, long contentlength)
{
_stream = stream;
_buffer = buffer;
_offset = offset;
_length = length;
_remainingBody = contentlength;
}
// 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.
private int FillFromBuffer(byte[] buffer, int offset, int count)
{
if (_remainingBody == 0)
return -1;
if (_length == 0)
return 0;
int size = Math.Min(_length, count);
if (_remainingBody > 0)
size = (int)Math.Min(size, _remainingBody);
if (_offset > _buffer.Length - size)
{
size = Math.Min(size, _buffer.Length - _offset);
}
if (size == 0)
return 0;
Buffer.BlockCopy(_buffer, _offset, buffer, offset, size);
_offset += size;
_length -= size;
if (_remainingBody > 0)
_remainingBody -= size;
return size;
}
protected virtual int ReadCore(byte[] buffer, int offset, int size)
{
// Call FillFromBuffer to check for buffer boundaries even when remaining_body is 0
int nread = FillFromBuffer(buffer, offset, size);
if (nread == -1)
{ // No more bytes available (Content-Length)
return 0;
}
else if (nread > 0)
{
return nread;
}
if (_remainingBody > 0)
{
size = (int)Math.Min(_remainingBody, (long)size);
}
nread = _stream.Read(buffer, offset, size);
if (_remainingBody > 0)
{
if (nread == 0)
{
throw new Exception("Bad request");
}
//Debug.Assert(nread <= _remainingBody);
_remainingBody -= nread;
}
return nread;
}
protected virtual IAsyncResult BeginReadCore(byte[] buffer, int offset, int size, AsyncCallback cback, object state)
{
if (size == 0 || _closed)
{
HttpStreamAsyncResult ares = new HttpStreamAsyncResult(this);
ares._callback = cback;
ares._state = state;
ares.Complete();
return ares;
}
int nread = FillFromBuffer(buffer, offset, size);
if (nread > 0 || nread == -1)
{
HttpStreamAsyncResult ares = new HttpStreamAsyncResult(this);
ares._buffer = buffer;
ares._offset = offset;
ares._count = size;
ares._callback = cback;
ares._state = state;
ares._synchRead = Math.Max(0, nread);
ares.Complete();
return ares;
}
// Avoid reading past the end of the request to allow
// for HTTP pipelining
if (_remainingBody >= 0 && size > _remainingBody)
{
size = (int)Math.Min(_remainingBody, (long)size);
}
return _stream.BeginRead(buffer, offset, size, cback, state);
}
public override int EndRead(IAsyncResult asyncResult)
{
if (asyncResult == null)
throw new ArgumentNullException(nameof(asyncResult));
if (asyncResult is HttpStreamAsyncResult r)
{
if (!ReferenceEquals(this, r._parent))
{
throw new ArgumentException("Invalid async result");
}
if (r._endCalled)
{
throw new InvalidOperationException("invalid end call");
}
r._endCalled = true;
if (!asyncResult.IsCompleted)
{
asyncResult.AsyncWaitHandle.WaitOne();
}
return r._synchRead;
}
if (_closed)
return 0;
int nread = 0;
try
{
nread = _stream.EndRead(asyncResult);
}
catch (IOException e) when (e.InnerException is ArgumentException || e.InnerException is InvalidOperationException)
{
throw e.InnerException;
}
if (_remainingBody > 0)
{
if (nread == 0)
{
throw new Exception("Bad request");
}
_remainingBody -= nread;
}
return nread;
}
}
}
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