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114 lines (94 loc) · 2.88 KB
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// OffsetStream.cs
// ------------------------------------------------------------------
//
// Copyright (c) 2009 Dino Chiesa
// All rights reserved.
//
// This code module is part of DotNetZip, a zipfile class library.
//
// ------------------------------------------------------------------
//
// This code is licensed under the Microsoft Public License.
// See the file License.txt for the license details.
// More info on: http://dotnetzip.codeplex.com
//
// ------------------------------------------------------------------
//
// last saved (in emacs):
// Time-stamp: <2009-August-27 12:50:35>
//
// ------------------------------------------------------------------
//
// This module defines logic for handling reading of zip archives embedded
// into larger streams. The initial position of the stream serves as
// the base offset for all future Seek() operations.
//
// ------------------------------------------------------------------
using System;
using System.IO;
namespace Ionic.Zip
{
internal class OffsetStream : System.IO.Stream, System.IDisposable
{
private Int64 _originalPosition;
private Stream _innerStream;
public OffsetStream(Stream s)
: base()
{
_originalPosition = s.Position;
_innerStream = s;
}
public override int Read(byte[] buffer, int offset, int count)
{
return _innerStream.Read(buffer, offset, count);
}
public override void Write(byte[] buffer, int offset, int count)
{
throw new NotImplementedException();
}
public override bool CanRead
{
get { return _innerStream.CanRead; }
}
public override bool CanSeek
{
get { return _innerStream.CanSeek; }
}
public override bool CanWrite
{
get { return false; }
}
public override void Flush()
{
_innerStream.Flush();
}
public override long Length
{
get
{
return _innerStream.Length;
}
}
public override long Position
{
get { return _innerStream.Position - _originalPosition; }
set { _innerStream.Position = _originalPosition + value; }
}
public override long Seek(long offset, System.IO.SeekOrigin origin)
{
return _innerStream.Seek(_originalPosition + offset, origin) - _originalPosition;
}
public override void SetLength(long value)
{
throw new NotImplementedException();
}
void IDisposable.Dispose()
{
Close();
}
public override void Close()
{
base.Close();
}
}
}