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#define DOTNET20
#define UNMANAGED
#define COMPRESS
using System.IO;
using System;
namespace SevenZip
{
/// <summary>
/// The Stream extension class to emulate the archive part of a stream.
/// </summary>
internal class ArchiveEmulationStreamProxy : Stream, IDisposable
{
/// <summary>
/// Gets the file offset.
/// </summary>
public int Offset { get; private set; }
/// <summary>
/// The source wrapped stream.
/// </summary>
public Stream Source { get; private set; }
/// <summary>
/// Initializes a new instance of the ArchiveEmulationStream class.
/// </summary>
/// <param name="stream">The stream to wrap.</param>
/// <param name="offset">The stream offset.</param>
public ArchiveEmulationStreamProxy(Stream stream, int offset)
{
Source = stream;
Offset = offset;
Source.Position = offset;
}
public override bool CanRead
{
get { return Source.CanRead; }
}
public override bool CanSeek
{
get { return Source.CanSeek; }
}
public override bool CanWrite
{
get { return Source.CanWrite; }
}
public override void Flush()
{
Source.Flush();
}
public override long Length
{
get { return Source.Length - Offset; }
}
public override long Position
{
get
{
return Source.Position - Offset;
}
set
{
Source.Position = value;
}
}
public override int Read(byte[] buffer, int offset, int count)
{
return Source.Read(buffer, offset, count);
}
public override long Seek(long offset, SeekOrigin origin)
{
return Source.Seek(origin == SeekOrigin.Begin ? offset + Offset : offset,
origin) - Offset;
}
public override void SetLength(long value)
{
Source.SetLength(value);
}
public override void Write(byte[] buffer, int offset, int count)
{
Source.Write(buffer, offset, count);
}
public new void Dispose()
{
Source.Dispose();
}
public override void Close()
{
Source.Close();
}
}
}
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