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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Runtime.CompilerServices;
using System.Threading;
using System.Threading.Tasks;
namespace System.IO.Compression
{
public class GZipStream : Stream
{
private DeflateStream _deflateStream;
public GZipStream(Stream stream, CompressionMode mode): this(stream, mode, leaveOpen: false)
{
}
public GZipStream(Stream stream, CompressionMode mode, bool leaveOpen)
{
_deflateStream = new DeflateStream(stream, mode, leaveOpen, ZLibNative.GZip_DefaultWindowBits);
}
// Implies mode = Compress
public GZipStream(Stream stream, CompressionLevel compressionLevel): this(stream, compressionLevel, leaveOpen: false)
{
}
// Implies mode = Compress
public GZipStream(Stream stream, CompressionLevel compressionLevel, bool leaveOpen)
{
_deflateStream = new DeflateStream(stream, compressionLevel, leaveOpen, ZLibNative.GZip_DefaultWindowBits);
}
public override bool CanRead => _deflateStream?.CanRead ?? false;
public override bool CanWrite => _deflateStream?.CanWrite ?? false;
public override bool CanSeek => _deflateStream?.CanSeek ?? false;
public override long Length
{
get { throw new NotSupportedException(SR.NotSupported); }
}
public override long Position
{
get { throw new NotSupportedException(SR.NotSupported); }
set { throw new NotSupportedException(SR.NotSupported); }
}
public override void Flush()
{
CheckDeflateStream();
_deflateStream.Flush();
return;
}
public override long Seek(long offset, SeekOrigin origin)
{
throw new NotSupportedException(SR.NotSupported);
}
public override void SetLength(long value)
{
throw new NotSupportedException(SR.NotSupported);
}
public override int ReadByte()
{
CheckDeflateStream();
return _deflateStream.ReadByte();
}
#if netstandard17
public override IAsyncResult BeginRead(byte[] array, int offset, int count, AsyncCallback asyncCallback, object asyncState) =>
TaskToApm.Begin(WriteAsync(array, offset, count, CancellationToken.None), asyncCallback, asyncState);
public override int EndRead(IAsyncResult asyncResult) =>
TaskToApm.End<int>(asyncResult);
#endif
public override int Read(byte[] array, int offset, int count)
{
CheckDeflateStream();
return _deflateStream.Read(array, offset, count);
}
#if netstandard17
public override IAsyncResult BeginWrite(byte[] array, int offset, int count, AsyncCallback asyncCallback, object asyncState) =>
TaskToApm.Begin(WriteAsync(array, offset, count, CancellationToken.None), asyncCallback, asyncState);
public override void EndWrite(IAsyncResult asyncResult) =>
TaskToApm.End(asyncResult);
#endif
public override void Write(byte[] array, int offset, int count)
{
CheckDeflateStream();
_deflateStream.Write(array, offset, count);
}
protected override void Dispose(bool disposing)
{
try
{
if (disposing && _deflateStream != null)
{
_deflateStream.Dispose();
}
_deflateStream = null;
}
finally
{
base.Dispose(disposing);
}
}
public Stream BaseStream => _deflateStream?.BaseStream;
public override Task<int> ReadAsync(byte[] array, int offset, int count, CancellationToken cancellationToken)
{
CheckDeflateStream();
return _deflateStream.ReadAsync(array, offset, count, cancellationToken);
}
public override Task WriteAsync(byte[] array, int offset, int count, CancellationToken cancellationToken)
{
CheckDeflateStream();
return _deflateStream.WriteAsync(array, offset, count, cancellationToken);
}
public override Task FlushAsync(CancellationToken cancellationToken)
{
CheckDeflateStream();
return _deflateStream.FlushAsync(cancellationToken);
}
public override Task CopyToAsync(Stream destination, int bufferSize, CancellationToken cancellationToken)
{
CheckDeflateStream();
return _deflateStream.CopyToAsync(destination, bufferSize, cancellationToken);
}
private void CheckDeflateStream()
{
if (_deflateStream == null)
{
ThrowStreamClosedException();
}
}
[MethodImpl(MethodImplOptions.NoInlining)]
private static void ThrowStreamClosedException()
{
throw new ObjectDisposedException(null, SR.ObjectDisposed_StreamClosed);
}
}
}
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