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