GARbro-mirror/ArcFormats/Abel/ImageGPS.cs

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//! \file ImageGPS.cs
//! \date Sat Feb 20 14:13:10 2016
//! \brief ADVEngine compressed bitmap.
//
// 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.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using GameRes.Compression;
using GameRes.Utility;
namespace GameRes.Formats.Abel
{
internal class GpsMetaData : ImageMetaData
{
public byte Compression;
public int PackedSize;
public int UnpackedSize;
}
[Export(typeof(ImageFormat))]
public class GpsFormat : BmpFormat
{
public override string Tag { get { return "GPS"; } }
public override string Description { get { return "ADVEngine compressed bitmap"; } }
public override uint Signature { get { return 0x535047; } } // 'GPS'
public override bool CanWrite { get { return false; } }
public GpsFormat ()
{
Extensions = new string[] { "gps", "cmp" };
}
public override ImageMetaData ReadMetaData (Stream stream)
{
var header = new byte[0x29];
if (header.Length != stream.Read (header, 0, header.Length))
return null;
var gps = new GpsMetaData
{
Width = LittleEndian.ToUInt32 (header, 0x19),
Height = LittleEndian.ToUInt32 (header, 0x1D),
Compression = header[0x10],
UnpackedSize = LittleEndian.ToInt32 (header, 0x11),
PackedSize = LittleEndian.ToInt32 (header, 0x15),
};
// read BMP header
using (var input = OpenGpsStream (stream, gps.Compression, 0x54))
{
var bmp_info = base.ReadMetaData (input);
if (null == bmp_info)
return null;
gps.BPP = bmp_info.BPP;
return gps;
}
}
public override ImageData Read (Stream stream, ImageMetaData info)
{
var gps = (GpsMetaData)info;
stream.Position = 0x29;
using (var input = OpenGpsStream (stream, gps.Compression, gps.UnpackedSize))
return base.Read (input, info);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("GpsFormat.Write not implemented");
}
Stream OpenGpsStream (Stream input, byte compression, int unpacked_size)
{
if (0 == compression)
return new StreamRegion (input, 0x29, true);
else if (1 == compression)
return OpenRLEStream (input, unpacked_size);
else if (2 == compression)
return new LzssStream (input, LzssMode.Decompress, true);
else if (3 == compression)
{
using (var lzss = new LzssStream (input, LzssMode.Decompress, true))
return OpenRLEStream (lzss, unpacked_size);
}
else
throw new InvalidFormatException();
}
Stream OpenRLEStream (Stream input, int output_size)
{
var output = new byte[output_size];
UnpackRLE (input, output);
return new MemoryStream (output);
}
void UnpackRLE (Stream input, byte[] output)
{
int dst = 0;
while (dst < output.Length)
{
int count = Math.Min (3, output.Length-dst);
count = input.Read (output, dst, count);
if (count < 3)
break;
count = input.ReadByte();
if (-1 == count)
break;
dst += 3;
if (count > 1)
{
count = Math.Min ((count-1) * 3, output.Length-dst);
Binary.CopyOverlapped (output, dst-3, dst, count);
dst += count;
}
}
}
}
}