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added EGN, rare compressed bitmap format.

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morkt 2015-06-17 17:38:04 +04:00
parent ac5a7cd173
commit 147ef67c7d
1 changed files with 194 additions and 0 deletions
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ArcFormats/ImageEGN.cs Normal file
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//! \file ImageEGN.cs
//! \date Tue Jun 16 12:53:40 2015
//! \brief EGN compressed image format.
//
// 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.ComponentModel.Composition;
using System.IO;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using GameRes.Utility;
namespace GameRes.Formats.Unknown
{
internal class EgnMetaData : ImageMetaData
{
public int Mode;
public int Flag;
public int DataOffset;
public int UnpackedSize;
}
[Export(typeof(ImageFormat))]
public class EgnFormat : BmpFormat
{
public override string Tag { get { return "EGN"; } }
public override string Description { get { return "LZSS-compressed BMP image"; } }
public override uint Signature { get { return 0; } }
public override ImageMetaData ReadMetaData (Stream stream)
{
using (var input = new ArcView.Reader (stream))
{
int signature = ~input.ReadInt32();
int mode = (signature & 0x70) >> 4; // v6
if (0 != (mode & 4))
return null;
int flag = signature & 0xF; // v7
int data_size, data_offset;
if (0 != (signature & 0x80))
{
data_offset = 4;
data_size = Binary.BigEndian (signature) & 0xFFFFFF;
}
else
{
data_offset = 8;
data_size = Binary.BigEndian (input.ReadInt32());
}
if (data_size <= 0 || data_size > 0xFFFFFF) // arbitrary max BMP size
return null;
var reader = new Reader (input, 0x36, mode, flag); // size of BMP header
reader.Unpack();
using (var bmp = new MemoryStream (reader.Data))
{
var info = base.ReadMetaData (bmp);
if (null == info)
return null;
return new EgnMetaData
{
Width = info.Width,
Height = info.Height,
BPP = info.BPP,
Mode = mode,
Flag = flag,
DataOffset = data_offset,
UnpackedSize = data_size,
};
}
}
}
public override ImageData Read (Stream stream, ImageMetaData info)
{
var meta = info as EgnMetaData;
if (null == meta)
throw new ArgumentException ("EgnFormat.Read should be supplied with EgnMetaData", "info");
stream.Position = meta.DataOffset;
using (var input = new ArcView.Reader (stream))
{
var reader = new Reader (input, meta.UnpackedSize, meta.Mode, meta.Flag);
reader.Unpack();
using (var bmp = new MemoryStream (reader.Data))
return base.Read (bmp, info);
}
}
internal class Reader
{
BinaryReader m_input;
int m_mode;
int m_flag;
byte[] m_output;
public byte[] Data { get { return m_output; } }
public Reader (BinaryReader input, int output_size, int mode, int flag)
{
m_input = input;
m_mode = mode;
m_flag = flag;
m_output = new byte[output_size];
}
public void Unpack ()
{
switch (m_mode)
{
case 0:
UnpackV0();
break;
case 1:
case 2:
case 3:
throw new NotSupportedException ("Not supported EGN compression");
default:
throw new InvalidFormatException();
}
}
void UnpackV0 () // sub_4047AF
{
int count_shift = ShiftTable[2 * m_flag];
int offset_mask = (1 << count_shift) - 1;
int base_offset = ShiftTable[2 * m_flag + 1];
byte v12 = 0;
int dst = 0;
byte v8 = 0;
while (dst < m_output.Length)
{
v8 >>= 1;
if (0 == v8)
{
v12 = m_input.ReadByte();
v8 = 0x80;
}
if (0 != (v8 & v12))
{
m_output[dst++] = m_input.ReadByte();
}
else
{
ushort v4 = Binary.BigEndian (m_input.ReadUInt16());
int count = base_offset + (v4 >> count_shift);
int src = dst - (v4 & offset_mask);
do
{
if (src >= 0)
m_output[dst] = m_output[src];
else
m_output[dst] = 0;
++src;
++dst;
--count;
}
while (count > 0 && dst < m_output.Length);
}
}
}
static readonly byte[] ShiftTable = new byte[]
{
0x0C, 0x03, 0x0B, 0x03, 0x0A, 0x03, 0x09, 0x03, 0x06, 0x03, 0x05, 0x03, 0x06, 0x02, 0x05, 0x02,
0x08, 0x04, 0x07, 0x04, 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01, 0x00, 0x00, 0x00, 0x00,
};
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("EgnFormat.Write not implemented");
}
}
}