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GARbro-mirror/ArcFormats/RiddleSoft/ImageGCP.cs
2017-11-07 15:43:23 +04:00

187 lines
6.5 KiB
C#

//! \file ImageGCP.cs
//! \date Fri Feb 20 14:26:51 2015
//! \brief GCP image format implementation.
//
// 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;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using System.Text;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using GameRes.Utility;
namespace GameRes.Formats.Riddle
{
internal class GcpMetaData : ImageMetaData
{
public int DataSize;
public int PackedSize;
}
[Export(typeof(ImageFormat))]
public class GcpFormat : ImageFormat
{
public override string Tag { get { return "GCP"; } }
public override string Description { get { return "Riddle Soft compressed bitmap"; } }
public override uint Signature { get { return 0x31504d43u; } } // 'CMP1'
public override void Write (Stream file, ImageData image)
{
throw new NotImplementedException ("GcpFormat.Write not implemented");
}
public override ImageMetaData ReadMetaData (IBinaryStream stream)
{
var header = stream.ReadHeader (12);
int data_size = header.ToInt32 (4);
int pack_size = header.ToInt32 (8);
if (data_size < 54)
return null;
var reader = new CmpReader (stream.AsStream, pack_size, 0x22); // BMP header
reader.Unpack();
var bmp = reader.Data;
if (bmp[0] != 'B' || bmp[1] != 'M')
return null;
int width = LittleEndian.ToInt32 (bmp, 0x12);
int height = LittleEndian.ToInt32 (bmp, 0x16);
int bpp = LittleEndian.ToInt16 (bmp, 0x1c);
return new GcpMetaData
{
Width = (uint)width,
Height = (uint)height,
BPP = bpp,
DataSize = data_size,
PackedSize = pack_size,
};
}
public override ImageData Read (IBinaryStream stream, ImageMetaData info)
{
var meta = (GcpMetaData)info;
stream.Position = 12;
var reader = new CmpReader (stream.AsStream, meta.PackedSize, meta.DataSize);
reader.Unpack();
// 24bpp bitmaps have non-standard stride
if (24 == meta.BPP && 0 != (meta.Width & 3)
&& (meta.Height * meta.Width * 3 + 54) == meta.DataSize)
{
int stride = (int)meta.Width * 3;
var pixels = new byte[stride * (int)meta.Height];
Buffer.BlockCopy (reader.Data, 54, pixels, 0, pixels.Length);
return ImageData.CreateFlipped (meta, PixelFormats.Bgr24, null, pixels, stride);
}
using (var bmp = new MemoryStream (reader.Data))
{
var decoder = new BmpBitmapDecoder (bmp,
BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
BitmapSource frame = decoder.Frames[0];
frame.Freeze();
return new ImageData (frame, info);
}
}
}
internal class CmpReader
{
Stream m_input;
byte[] m_output;
int m_src_count = 0;
int m_src_total;
public byte[] Data { get { return m_output; } }
public CmpReader (Stream file, int src_size, int dst_size)
{
m_input = file;
m_output = new byte[dst_size];
m_src_total = src_size;
}
public void Unpack ()
{
int dst = 0;
var shift = new byte[0x800];
int edi = 0x7ef;
for (int i = 0; i < edi; ++i)
shift[i] = 0x20;
while (dst < m_output.Length)
{
int bit = GetBits (1);
if (-1 == bit)
break;
if (1 == bit)
{
int data = GetBits (8);
if (-1 == data)
break;
m_output[dst++] = (byte)data;
shift[edi++] = (byte)data;
edi &= 0x7ff;
}
else
{
int offset = GetBits (11); // [esp+10]
if (-1 == offset)
break;
int count = GetBits (4);
if (-1 == count)
break;
count += 2;
for (int i = 0; i < count; ++i)
{
byte data = shift[(offset + i) & 0x7ff];
m_output[dst++] = data;
shift[edi++] = data;
edi &= 0x7ff;
if (m_output.Length == dst)
return;
}
}
}
}
int m_bits = 0;
int m_cached_bits = 0;
int GetBits (int count)
{
while (m_cached_bits < count)
{
if (m_src_count++ >= m_src_total)
return -1;
int b = m_input.ReadByte();
if (-1 == b)
return -1;
m_bits = (m_bits << 8) | b;
m_cached_bits += 8;
}
int mask = (1 << count) - 1;
m_cached_bits -= count;
return (m_bits >> m_cached_bits) & mask;
}
}
}