GARbro-mirror/ArcFormats/BellDa/ImageCP.cs

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//! \file ImageCP.cs
//! \date 2018 Jun 11
//! \brief BELL-DA LZSS-compressed bitmap.
//
// Copyright (C) 2018 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.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using GameRes.Compression;
namespace GameRes.Formats.BellDa
{
[Export(typeof(ImageFormat))]
public class CpFormat : ImageFormat
{
public override string Tag { get { return "BMP/CP"; } }
public override string Description { get { return "BELL-DA compressed bitmap"; } }
public override uint Signature { get { return 0; } }
public CpFormat ()
{
Signatures = new uint[] { 0x42FD5043, 0 };
}
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
var header = file.ReadHeader (5);
if (!header.AsciiEqual (0, "CP") || (header[2] & 0xC0) != 0xC0 ||
!header.AsciiEqual (3, "BM"))
return null;
using (var bmp = OpenCompressed (file))
return Bmp.ReadMetaData (bmp);
}
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
using (var bmp = OpenCompressed (file))
return Bmp.Read (bmp, info);
}
internal IBinaryStream OpenCompressed (IBinaryStream file)
{
Stream input = new StreamRegion (file.AsStream, 2, true);
input = new PackedStream<CpLzssDecompressor> (input);
return new BinaryStream (input, file.Name);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("CpFormat.Write not implemented");
}
}
internal class CpLzssDecompressor : Decompressor
{
Stream m_input;
public override void Initialize (Stream input)
{
m_input = input;
}
protected override IEnumerator<int> Unpack ()
{
byte[] frame = new byte[0x1000];
int frame_pos = 1;
const int frame_mask = 0xFFF;
for (;;)
{
int ctl = m_input.ReadByte();
if (-1 == ctl)
yield break;
for (int bit = 0x80; bit != 0; bit >>= 1)
{
if (0 != (ctl & bit))
{
int b = m_input.ReadByte();
if (-1 == b)
yield break;
frame[frame_pos++ & frame_mask] = (byte)b;
m_buffer[m_pos++] = (byte)b;
if (0 == --m_length)
yield return m_pos;
}
else
{
int hi = m_input.ReadByte();
if (-1 ==hi)
yield break;
int lo = m_input.ReadByte();
if (-1 == lo)
yield break;
int offset = hi << 4 | lo >> 4;
for (int count = 2 + (lo & 0xF); count > 0; --count)
{
byte v = frame[offset++ & frame_mask];
frame[frame_pos++ & frame_mask] = v;
m_buffer[m_pos++] = v;
if (0 == --m_length)
yield return m_pos;
}
}
}
}
}
}
}