93 lines
2.9 KiB
C#
93 lines
2.9 KiB
C#
//
|
|
// 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;
|
|
}
|
|
}
|
|
}
|
|
|