GARbro-mirror/ArcFormats/ImagePMP.cs

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//! \file ImagePMP.cs
//! \date Thu Apr 30 20:39:26 2015
//! \brief ScenePlayer compressed bitmap.
//
// Copyright (C) 2015 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using System.ComponentModel.Composition;
using System.IO;
using System.Text;
using GameRes.Compression;
using GameRes.Utility;
namespace GameRes.Formats.ScenePlayer
{
[Export(typeof(ImageFormat))]
public class PmpFormat : BmpFormat
{
public override string Tag { get { return "PMP"; } }
public override string Description { get { return "ScenePlayer compressed bitmap format"; } }
public override uint Signature { get { return 0; } }
public override void Write (Stream file, ImageData image)
{
using (var output = new XoredStream (file, 0x21, true))
using (var zstream = new ZLibStream (output, CompressionMode.Compress, CompressionLevel.Level9))
base.Write (zstream, image);
}
public override ImageMetaData ReadMetaData (Stream stream)
{
int first = stream.ReadByte() ^ 0x21;
if (first != 0x78) // doesn't look like zlib stream
return null;
stream.Position = 0;
using (var input = new XoredStream (stream, 0x21, true))
using (var zstream = new ZLibStream (input, CompressionMode.Decompress))
return base.ReadMetaData (zstream);
}
public override ImageData Read (Stream stream, ImageMetaData info)
{
using (var input = new XoredStream (stream, 0x21, true))
using (var zstream = new ZLibStream (input, CompressionMode.Decompress))
return base.Read (zstream, info);
}
}
public class XoredStream : Stream
{
private Stream m_stream;
private byte m_key;
private bool m_should_dispose;
public Stream BaseStream { get { return m_stream; } }
public override bool CanRead { get { return m_stream.CanRead; } }
public override bool CanSeek { get { return m_stream.CanSeek; } }
public override bool CanWrite { get { return m_stream.CanWrite; } }
public override long Length { get { return m_stream.Length; } }
public override long Position
{
get { return m_stream.Position; }
set { m_stream.Position = value; }
}
public XoredStream (Stream stream, byte key, bool leave_open = false)
{
m_stream = stream;
m_key = key;
m_should_dispose = !leave_open;
}
#region System.IO.Stream methods
public override void Flush()
{
m_stream.Flush();
}
public override long Seek (long offset, SeekOrigin origin)
{
return m_stream.Seek (offset, origin);
}
public override void SetLength (long length)
{
m_stream.SetLength (length);
}
public override int Read (byte[] buffer, int offset, int count)
{
int read = m_stream.Read (buffer, offset, count);
for (int i = 0; i < read; ++i)
{
buffer[offset+i] ^= m_key;
}
return read;
}
public override int ReadByte ()
{
int b = m_stream.ReadByte();
if (-1 != b)
{
b ^= m_key;
}
return b;
}
byte[] write_buf;
public override void Write (byte[] buffer, int offset, int count)
{
if (null == write_buf || write_buf.Length < count)
write_buf = new byte[count];
for (int i = 0; i < count; ++i)
{
write_buf[i] = (byte)(buffer[offset+i] ^ m_key);
}
m_stream.Write (write_buf, 0, count);
}
public override void WriteByte (byte value)
{
m_stream.WriteByte ((byte)(value ^ m_key));
}
#endregion
#region IDisposable Members
bool disposed = false;
protected override void Dispose (bool disposing)
{
if (!disposed)
{
if (disposing && m_should_dispose)
{
m_stream.Dispose();
}
disposed = true;
base.Dispose (disposing);
}
}
#endregion
}
}