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//
// MonoChunkStream.cs
//
// Author:
// Martin Baulig <mabaul@microsoft.com>
//
// Copyright (c) 2018 Xamarin Inc. (http://www.xamarin.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;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace System.Net
{
class MonoChunkStream : WebReadStream
{
protected WebHeaderCollection Headers {
get;
}
protected MonoChunkParser Decoder {
get;
}
public MonoChunkStream (WebOperation operation, Stream innerStream,
WebHeaderCollection headers)
: base (operation, innerStream)
{
Headers = headers;
Decoder = new MonoChunkParser (headers);
}
protected override async Task<int> ProcessReadAsync (
byte[] buffer, int offset, int size,
CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested ();
if (Decoder.DataAvailable)
return Decoder.Read (buffer, offset, size);
int ret = 0;
byte[] moreBytes = null;
while (ret == 0 && Decoder.WantMore) {
int localSize = Decoder.ChunkLeft;
if (localSize <= 0) // not read chunk size yet
localSize = 1024;
else if (localSize > 16384)
localSize = 16384;
if (moreBytes == null || moreBytes.Length < localSize)
moreBytes = new byte[localSize];
ret = await InnerStream.ReadAsync (
moreBytes, 0, localSize, cancellationToken).ConfigureAwait (false);
if (ret <= 0)
return ret;
Decoder.Write (moreBytes, 0, ret);
ret = Decoder.Read (buffer, offset, size);
}
return ret;
}
internal override async Task FinishReading (CancellationToken cancellationToken)
{
await base.FinishReading (cancellationToken).ConfigureAwait (false);
cancellationToken.ThrowIfCancellationRequested ();
/*
* We are expecting the chunk trailer, but no more data.
*/
if (Decoder.DataAvailable)
ThrowExpectingChunkTrailer ();
/*
* Need to loop here since there might be header fields after
* the chunk trailer.
*/
while (Decoder.WantMore) {
var buffer = new byte[256];
int ret = await InnerStream.ReadAsync (
buffer, 0, buffer.Length, cancellationToken).ConfigureAwait (false);
if (ret <= 0)
ThrowExpectingChunkTrailer ();
Decoder.Write (buffer, 0, ret);
ret = Decoder.Read (buffer, 0, 1);
if (ret != 0)
ThrowExpectingChunkTrailer ();
}
}
static void ThrowExpectingChunkTrailer ()
{
throw new WebException (
"Expecting chunk trailer.", null,
WebExceptionStatus.ServerProtocolViolation, null);
}
}
}
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