#region Disclaimer / License
// Copyright (C) 2010, Jackie Ng
// http://trac.osgeo.org/mapguide/wiki/maestro, jumpinjackie@gmail.com
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
#endregion
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using OSGeo.MapGuide.MaestroAPI.IO;
namespace OSGeo.MapGuide.MaestroAPI.Native
{
///
/// Represents a method that returns a instance
///
///
public delegate MgByteReader GetByteReaderMethod();
///
/// A read-only adapter for the
/// class.
///
public class MgReadOnlyStream : ReadOnlyRewindableStream
{
private MgByteReader _reader;
///
/// Creates a new instance
///
///
public MgReadOnlyStream(GetByteReaderMethod method)
{
_reader = method();
}
~MgReadOnlyStream()
{
Dispose(false);
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
_reader.Dispose();
}
base.Dispose(disposing);
}
public override void Flush()
{
}
public override long Length
{
//NOTE: MgByteReader only returns remaining length! Should we
//be keeping track of position and adding on this value?
get { return _reader.GetLength(); }
}
public override bool CanRewind
{
get { return _reader.IsRewindable(); }
}
public override void Rewind()
{
if (!CanRewind)
throw new InvalidOperationException("This stream is not rewindable"); //LOCALIZEME
_reader.Rewind();
}
public override int Read(byte[] buffer, int offset, int count)
{
int read = 0;
//For good times, please always have the offset as 0
if (offset == 0)
{
read = _reader.Read(buffer, count);
}
else //So you want to play the hard way eh? Bad performance for you!
{
byte[] b = new byte[count];
read = _reader.Read(b, count);
Array.Copy(b, 0, buffer, offset, read);
}
return read;
}
}
}