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// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
namespace WixToolset.Dtf.Compression.Zip
{
using System;
using System.IO;
/// <summary>
/// Used to trick a DeflateStream into reading from or writing to
/// a series of (chunked) streams instead of a single steream.
/// </summary>
internal class ConcatStream : Stream
{
private Stream source;
private long position;
private long length;
private Action<ConcatStream> nextStreamHandler;
public ConcatStream(Action<ConcatStream> nextStreamHandler)
{
if (nextStreamHandler == null)
{
throw new ArgumentNullException("nextStreamHandler");
}
this.nextStreamHandler = nextStreamHandler;
this.length = Int64.MaxValue;
}
public Stream Source
{
get { return this.source; }
set { this.source = value; }
}
public override bool CanRead
{
get { return true; }
}
public override bool CanWrite
{
get { return true; }
}
public override bool CanSeek
{
get { return false; }
}
public override long Length
{
get
{
return this.length;
}
}
public override long Position
{
get { return this.position; }
set { throw new NotSupportedException(); }
}
public override int Read(byte[] buffer, int offset, int count)
{
if (this.source == null)
{
this.nextStreamHandler(this);
}
count = (int) Math.Min(count, this.length - this.position);
int bytesRemaining = count;
while (bytesRemaining > 0)
{
if (this.source == null)
{
throw new InvalidOperationException();
}
int partialCount = (int) Math.Min(bytesRemaining,
this.source.Length - this.source.Position);
if (partialCount == 0)
{
this.nextStreamHandler(this);
continue;
}
partialCount = this.source.Read(
buffer, offset + count - bytesRemaining, partialCount);
bytesRemaining -= partialCount;
this.position += partialCount;
}
return count;
}
public override void Write(byte[] buffer, int offset, int count)
{
if (this.source == null)
{
this.nextStreamHandler(this);
}
int bytesRemaining = count;
while (bytesRemaining > 0)
{
if (this.source == null)
{
throw new InvalidOperationException();
}
int partialCount = (int) Math.Min(bytesRemaining,
Math.Max(0, this.length - this.source.Position));
if (partialCount == 0)
{
this.nextStreamHandler(this);
continue;
}
this.source.Write(
buffer, offset + count - bytesRemaining, partialCount);
bytesRemaining -= partialCount;
this.position += partialCount;
}
}
public override void Flush()
{
if (this.source != null)
{
this.source.Flush();
}
}
public override long Seek(long offset, SeekOrigin origin)
{
throw new NotSupportedException();
}
public override void SetLength(long value)
{
this.length = value;
}
public override void Close()
{
if (this.source != null)
{
this.source.Close();
}
}
}
}
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