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//
// ContentDecodeStream.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.IO.Compression;
using System.Threading;
using System.Threading.Tasks;
namespace System.Net
{
class ContentDecodeStream : WebReadStream
{
internal enum Mode
{
GZip,
Deflate
}
public static ContentDecodeStream Create (
WebOperation operation, Stream innerStream, Mode mode)
{
Stream decodeStream;
if (mode == Mode.GZip)
decodeStream = new GZipStream (innerStream, CompressionMode.Decompress);
else
decodeStream = new DeflateStream (innerStream, CompressionMode.Decompress);
return new ContentDecodeStream (operation, decodeStream, innerStream);
}
Stream OriginalInnerStream {
get;
}
ContentDecodeStream (WebOperation operation, Stream decodeStream,
Stream originalInnerStream)
: base (operation, decodeStream)
{
/*
* We pass the GZipStream/DeflateStream to the base .ctor,
* so it can Dispose() it when we're done.
*
* Save the original inner stream here for FinishReading().
*/
OriginalInnerStream = originalInnerStream;
}
protected override Task<int> ProcessReadAsync (
byte[] buffer, int offset, int size,
CancellationToken cancellationToken)
{
return InnerStream.ReadAsync (buffer, offset, size, cancellationToken);
}
internal override Task FinishReading (CancellationToken cancellationToken)
{
/*
* Call FinishReading() on the original inner stream.
*
* Since GZipStream/DeflateStream knows the exact number of
* bytes that it wants to receive from it, it may not have
* read the chunk trailer yet.
*/
if (OriginalInnerStream is WebReadStream innerReadStream)
return innerReadStream.FinishReading (cancellationToken);
return Task.CompletedTask;
}
}
}
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