GARbro-mirror/ArcFormats/BlueGale/ImageZBM.cs

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//! \file ImageZBM.cs
//! \date Sun Jan 10 00:41:42 2016
//! \brief BlueGale image format.
//
// 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 GameRes.Utility;
using System;
using System.ComponentModel.Composition;
using System.IO;
namespace GameRes.Formats.BlueGale
{
internal class ZbmMetaData : ImageMetaData
{
public int UnpackedSize;
public int DataOffset;
}
[Export(typeof(ImageFormat))]
public class ZbmFormat : ImageFormat
{
public override string Tag { get { return "ZBM/BLUEGALE"; } }
public override string Description { get { return "BlueGale compressed image format"; } }
public override uint Signature { get { return 0x5F706D61; } } // 'amp_'
public ZbmFormat ()
{
Extensions = new string[] { "zbm" };
}
public override ImageMetaData ReadMetaData (Stream stream)
{
stream.Position = 4;
using (var reader = new ArcView.Reader (stream))
{
int version = reader.ReadInt16();
if (version != 1)
return null;
int unpacked_size = reader.ReadInt32();
int data_offset = reader.ReadInt32();
if (unpacked_size < 0x36 || data_offset < stream.Position)
return null;
var header = new byte[0x20];
stream.Position = data_offset;
Unpack (stream, header);
Decrypt (header);
if ('B' != header[0] || 'M' != header[1])
return null;
return new ZbmMetaData
{
Width = LittleEndian.ToUInt32 (header, 0x12),
Height = LittleEndian.ToUInt32 (header, 0x16),
BPP = LittleEndian.ToInt16 (header, 0x1C),
UnpackedSize = unpacked_size,
DataOffset = data_offset,
};
}
}
public override ImageData Read (Stream stream, ImageMetaData info)
{
var meta = (ZbmMetaData)info;
var data = new byte[meta.UnpackedSize];
stream.Position = meta.DataOffset;
Unpack (stream, data);
Decrypt (data);
using (var bmp = new MemoryStream (data))
return Bmp.Read (bmp, info);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("ZbmFormat.Write not implemented");
}
internal static void Unpack (Stream input, byte[] output, int dst = 0)
{
using (var bits = new MsbBitStream (input, true))
{
bits.GetNextBit();
while (dst < output.Length)
{
int count = bits.GetBits (8);
if (-1 == count)
break;
if (count > 0x7F)
{
int offset = bits.GetBits (10);
if (-1 == offset)
throw new EndOfStreamException();
count = Math.Min (count & 0x7F, output.Length-dst);
Binary.CopyOverlapped (output, dst-offset, dst, count);
dst += count;
}
else
{
if (0 == count)
break;
for (int i = 0 ; i < count && dst < output.Length; i++)
{
int v = bits.GetBits (8);
if (-1 == v)
throw new EndOfStreamException();
output[dst++] = (byte)v;
}
}
}
}
}
static void Decrypt (byte[] data)
{
if (('B'^0xFF) == data[0] && ('M'^0xFF) == data[1])
{
int encrypted = Math.Min (100, data.Length);
for (int i = 0; i < encrypted; ++i)
data[i] ^= 0xFF;
}
}
}
}