211 lines
7.1 KiB
C#

//! \file ImageSPC.cs
//! \date Tue Mar 08 19:05:11 2016
//! \brief CRI MiddleWare compressed multi-frame image.
//
// Copyright (C) 2016 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;
using System.ComponentModel.Composition;
using System.IO;
using GameRes.Compression;
namespace GameRes.Formats.Cri
{
[Export(typeof(ImageFormat))]
public class SpcFormat : XtxFormat
{
public override string Tag { get { return "SPC"; } }
public override string Description { get { return "CRI MiddleWare compressed texture format"; } }
public override uint Signature { get { return 0; } }
public SpcFormat ()
{
Signatures = new uint[] { 0 };
}
public override ImageMetaData ReadMetaData (Stream stream)
{
uint unpacked_size = FormatCatalog.ReadSignature (stream);
if (unpacked_size <= 0x20 || unpacked_size > 0x5000000) // ~83MB
return null;
using (var lzss = new LzssStream (stream, LzssMode.Decompress, true))
using (var input = new SeekableStream (lzss))
return base.ReadMetaData (input);
}
public override ImageData Read (Stream stream, ImageMetaData info)
{
stream.Position = 4;
using (var lzss = new LzssStream (stream, LzssMode.Decompress, true))
using (var input = new SeekableStream (lzss))
return base.Read (input, info);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("SpcFormat.Write not implemented");
}
}
public class SeekableStream : Stream
{
Stream m_source;
Stream m_buffer;
bool m_should_dispose;
bool m_source_depleted;
long m_read_pos;
public SeekableStream (Stream input, bool leave_open = false)
{
m_source = input;
m_should_dispose = !leave_open;
m_read_pos = 0;
if (m_source.CanSeek)
{
m_buffer = m_source;
m_source_depleted = true;
}
else
{
m_buffer = new MemoryStream();
m_source_depleted = false;
}
}
#region IO.Stream Members
public override bool CanRead { get { return m_buffer.CanRead; } }
public override bool CanSeek { get { return true; } }
public override bool CanWrite { get { return false; } }
public override long Length
{
get
{
if (!m_source_depleted)
{
m_buffer.Seek (0, SeekOrigin.End);
m_source.CopyTo (m_buffer);
m_source_depleted = true;
}
return m_buffer.Length;
}
}
public override long Position
{
get { return m_read_pos; }
set { m_read_pos = value; }
}
public override int Read (byte[] buffer, int offset, int count)
{
int read, total_read = 0;
if (m_source_depleted)
{
m_buffer.Position = m_read_pos;
total_read = m_buffer.Read (buffer, offset, count);
m_read_pos += total_read;
return total_read;
}
if (m_read_pos < m_buffer.Length)
{
int available = (int)Math.Min (m_buffer.Length-m_read_pos, count);
m_buffer.Position = m_read_pos;
total_read = m_buffer.Read (buffer, offset, available);
m_read_pos += total_read;
count -= total_read;
if (0 == count)
return total_read;
offset += total_read;
}
else if (count > 0)
{
m_buffer.Seek (0, SeekOrigin.End);
while (m_read_pos > m_buffer.Length)
{
int available = (int)Math.Min (m_read_pos - m_buffer.Length, count);
read = m_source.Read (buffer, offset, available);
if (0 == read)
{
m_source_depleted = true;
return 0;
}
m_buffer.Write (buffer, offset, read);
}
}
read = m_source.Read (buffer, offset, count);
m_read_pos += read;
m_buffer.Write (buffer, offset, read);
return total_read + read;
}
public override void Flush()
{
}
public override long Seek (long offset, SeekOrigin origin)
{
if (SeekOrigin.Begin == origin)
m_read_pos = offset;
else if (SeekOrigin.Current == origin)
m_read_pos += offset;
else
m_read_pos = Length + offset;
return m_read_pos;
}
public override void SetLength (long length)
{
throw new NotSupportedException ("SeekableStream.SetLength method is not supported");
}
public override void Write (byte[] buffer, int offset, int count)
{
throw new NotSupportedException ("SeekableStream.Write method is not supported");
}
public override void WriteByte (byte value)
{
throw new NotSupportedException ("SeekableStream.WriteByte method is not supported");
}
#endregion
#region IDisposable Members
bool _disposed = false;
protected override void Dispose (bool disposing)
{
if (_disposed)
return;
if (disposing)
{
if (m_should_dispose)
m_source.Dispose();
if (m_buffer != m_source)
m_buffer.Dispose();
}
_disposed = true;
base.Dispose (disposing);
}
#endregion
}
}