mirror of
https://github.com/crskycode/GARbro.git
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134 lines
4.7 KiB
C#
134 lines
4.7 KiB
C#
//! \file ImageJMG.cs
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//! \date 2022 Jun 11
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//! \brief JAMES engine encrypted image.
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//
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// Copyright (C) 2022 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using GameRes.Utility;
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using System.ComponentModel.Composition;
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using System.IO;
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// [981105][Berserker] Situation
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// [991109][Berserker] Situation 2
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namespace GameRes.Formats.James
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{
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public enum Obfuscation
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{
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None,
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RotateWords,
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ReverseBits
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}
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public class JmgMetaData : ImageMetaData
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{
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public Obfuscation Method;
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public ImageMetaData BmpInfo;
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}
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[Export(typeof(ImageFormat))]
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public class JmgFormat : ImageFormat
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{
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public override string Tag { get { return "JMG"; } }
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public override string Description { get { return "JAMES engine obfuscated bitmap"; } }
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public override uint Signature { get { return 0; } }
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public override ImageMetaData ReadMetaData (IBinaryStream file)
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{
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var header = file.ReadHeader (2);
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Obfuscation method;
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if (header[0] == 0xD4 && header[1] == 0x24)
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method = Obfuscation.RotateWords;
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else if (header[0] == 0xB2 && header[1] == 0x42)
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method = Obfuscation.ReverseBits;
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else
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return null;
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using (var input = OpenAsBitmap (file, 0x40, method))
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{
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var info = Bmp.ReadMetaData (input);
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if (null == info)
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return null;
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return new JmgMetaData
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{
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Width = info.Width,
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Height = info.Height,
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BPP = info.BPP,
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Method = method,
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BmpInfo = info,
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};
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}
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}
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IBinaryStream OpenAsBitmap (IBinaryStream input, int length, Obfuscation method)
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{
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input.Position = 0;
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var data = input.ReadBytes (length);
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Deobfuscate (data, 0, length, method);
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return new BinMemoryStream (data, input.Name);
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}
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public override ImageData Read (IBinaryStream file, ImageMetaData info)
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{
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var meta = (JmgMetaData)info;
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using (var bmp = OpenAsBitmap (file, (int)file.Length, meta.Method))
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return Bmp.Read (bmp, meta.BmpInfo);
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}
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void Deobfuscate (byte[] data, int pos, int length, Obfuscation method)
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{
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switch (method)
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{
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case Obfuscation.RotateWords: RotateWords (data, pos, length); break;
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case Obfuscation.ReverseBits: ReverseBits (data, pos, length); break;
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}
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}
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void RotateWords (byte[] data, int pos, int length)
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{
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for (int i = 0; i < length; i += 2)
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{
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ushort w = LittleEndian.ToUInt16 (data, pos+i);
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w = (ushort)(w >> 12 | w << 4);
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LittleEndian.Pack (w, data, pos+i);
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}
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}
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void ReverseBits (byte[] data, int pos, int length)
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{
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for (int i = 0; i < length; i += 2)
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{
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int v = LittleEndian.ToUInt16 (data, pos+i);
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v = (v & 0xAAAA) >> 1 | (v & 0x5555) << 1;
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v = (v & 0xCCCC) >> 2 | (v & 0x3333) << 2;
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v = (v & 0xF0F0) >> 4 | (v & 0x0F0F) << 4;
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v = (v & 0xFF00) >> 8 | (v & 0x00FF) << 8;
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LittleEndian.Pack ((ushort)v, data, pos+i);
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}
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}
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public override void Write (Stream file, ImageData image)
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{
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throw new System.NotImplementedException ("JmgFormat.Write not implemented");
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}
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}
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}
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