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322 lines
11 KiB
C#
322 lines
11 KiB
C#
//! \file ImageMCG.cs
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//! \date Mon Jul 13 17:58:33 2015
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//! \brief F&C Co. image format.
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//
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// Copyright (C) 2015 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 System;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.IO;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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using GameRes.Formats.Strings;
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using GameRes.Utility;
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namespace GameRes.Formats.FC01
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{
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internal class McgMetaData : ImageMetaData
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{
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public int DataOffset;
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public int PackedSize;
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public int Version;
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}
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internal class McgOptions : ResourceOptions
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{
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public byte Key;
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}
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[Serializable]
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public class McgScheme : ResourceScheme
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{
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public Dictionary<string, byte> KnownKeys;
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}
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[Export(typeof(ImageFormat))]
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public class McgFormat : ImageFormat
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{
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public override string Tag { get { return "MCG"; } }
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public override string Description { get { return "F&C Co. image format"; } }
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public override uint Signature { get { return 0x2047434D; } } // 'MCG'
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public static Dictionary<string, byte> KnownKeys = new Dictionary<string, byte>();
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public override ResourceScheme Scheme
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{
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get { return new McgScheme { KnownKeys = KnownKeys }; }
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set { KnownKeys = ((McgScheme)value).KnownKeys; }
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}
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public override ImageMetaData ReadMetaData (IBinaryStream stream)
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{
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var header = stream.ReadHeader (0x40);
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if (header[5] != '.')
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return null;
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int version = header[4] * 100 + header[6] * 10 + header[7] - 0x14D0;
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if (version != 200 && version != 101)
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throw new NotSupportedException ("Not supported MCG format version");
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int header_size = header.ToInt32 (0x10);
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if (header_size < 0x40)
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return null;
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int bpp = header.ToInt32 (0x24);
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if (24 != bpp && 8 != bpp)
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throw new NotSupportedException ("Not supported MCG image bitdepth");
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int packed_size = header.ToInt32 (0x38);
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return new McgMetaData
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{
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Width = header.ToUInt32 (0x1c),
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Height = header.ToUInt32 (0x20),
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OffsetX = header.ToInt32 (0x14),
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OffsetY = header.ToInt32 (0x18),
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BPP = bpp,
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DataOffset = header_size,
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PackedSize = packed_size,
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Version = version,
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};
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}
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// cache key value so that dialog does not pop up on every file accessed.
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byte? LastKey = null;
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public override ImageData Read (IBinaryStream stream, ImageMetaData info)
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{
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var meta = (McgMetaData)info;
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byte key = Properties.Settings.Default.MCGLastKey;
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if (101 == meta.Version)
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{
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if (null == LastKey)
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{
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var options = Query<McgOptions> (arcStrings.ArcImageEncrypted);
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key = options.Key;
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}
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else
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key = LastKey.Value;
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}
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var reader = new McgDecoder (stream, meta, key);
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reader.Unpack();
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if (reader.Key != 0)
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LastKey = reader.Key;
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return ImageData.Create (info, reader.Format, reader.Palette, reader.Data, reader.Stride);
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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 ("McgFormat.Write not implemented");
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}
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public override ResourceOptions GetDefaultOptions ()
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{
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return new McgOptions { Key = Properties.Settings.Default.MCGLastKey };
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}
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public override ResourceOptions GetOptions (object widget)
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{
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var w = widget as GUI.WidgetMCG;
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if (null != w)
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Properties.Settings.Default.MCGLastKey = w.GetKey ();
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return GetDefaultOptions();
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}
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public override object GetAccessWidget ()
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{
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return new GUI.WidgetMCG();
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}
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}
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// mcg decompression // graphic.unt @ 100047B0
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internal class McgDecoder
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{
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byte[] m_input;
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byte[] m_output;
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int m_width;
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int m_height;
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int m_pixels;
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byte m_key;
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IBinaryStream m_file;
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McgMetaData m_info;
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public byte Key { get { return m_key; } }
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public byte[] Data { get { return m_output; } }
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public int Stride { get; private set; }
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public PixelFormat Format { get; private set; }
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public BitmapPalette Palette { get; private set; }
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public McgDecoder (IBinaryStream input, McgMetaData info, byte key)
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{
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m_file = input;
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m_info = info;
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m_width = (int)info.Width;
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m_height = (int)info.Height;
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m_pixels = m_width*m_height;
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m_key = key;
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Stride = m_width * m_info.BPP / 8;
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if (101 == m_info.Version)
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Stride = (Stride + 3) & -4;
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if (24 == m_info.BPP)
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Format = PixelFormats.Bgr24;
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else if (8 == m_info.BPP)
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Format = PixelFormats.Indexed8;
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else
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throw new InvalidFormatException();
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}
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static readonly byte[] ChannelOrder = { 1, 0, 2 };
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public void Unpack ()
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{
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m_file.Position = m_info.DataOffset;
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int input_size = m_info.PackedSize;
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if (0 == input_size)
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input_size = (int)m_file.Length;
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input_size -= m_info.DataOffset;
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if (8 == m_info.BPP)
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{
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Palette = ImageFormat.ReadPalette (m_file.AsStream);
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input_size -= 0x400;
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}
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m_input = m_file.ReadBytes (input_size);
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if (m_input.Length != input_size)
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throw new InvalidFormatException ("Unexpected end of file");
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if (200 == m_info.Version)
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UnpackV200();
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else
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UnpackV101();
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}
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void UnpackV101 ()
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{
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if (m_key != 0)
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{
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MrgOpener.Decrypt (m_input, 0, m_input.Length-1, m_key);
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}
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#if DEBUG
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else // bruteforce key *in debug build only*
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{
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for (int key = 1; key < 256; ++key)
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{
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var copy = m_input.Clone() as byte[];
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MrgOpener.Decrypt (copy, 0, copy.Length-1, (byte)key);
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using (var input = new BinMemoryStream (copy))
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using (var lzss = new MrgLzssReader (input, m_input.Length, Stride * m_height))
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{
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lzss.Unpack();
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if (input.Length - input.Position <= 1)
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{
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m_output = lzss.Data;
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m_key = (byte)key;
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return;
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}
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}
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}
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}
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#endif
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using (var input = new BinMemoryStream (m_input))
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using (var lzss = new MrgLzssReader (input, m_input.Length, Stride * m_height))
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{
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lzss.Unpack();
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// data remaining within input stream indicates invalid encryption key
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if (input.Length - input.Position > 1)
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{
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m_key = 0;
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}
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m_output = lzss.Data;
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}
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}
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void UnpackV200 ()
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{
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m_output = new byte[m_pixels*3];
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var reader = new MrgDecoder (m_input, 0, (uint)m_pixels);
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do
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{
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reader.ResetKey (m_key);
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try
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{
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for (int i = 0; i < 3; ++i)
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{
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reader.Unpack();
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var plane = reader.Data;
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int src = 0;
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for (int j = ChannelOrder[i]; j < m_output.Length; j += 3)
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{
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m_output[j] = plane[src++];
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}
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}
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// Trace.WriteLine (string.Format ("Found matching key {0:X2}", key), "[MCG]");
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}
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catch (InvalidFormatException)
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{
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m_key++;
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continue;
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}
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Transform();
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Properties.Settings.Default.MCGLastKey = m_key;
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return;
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}
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while (m_key != Properties.Settings.Default.MCGLastKey);
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throw new UnknownEncryptionScheme();
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}
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void Transform ()
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{
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int dst = 0;
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for (int y = m_height-1; y > 0; --y) // @@1a
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{
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for (int x = Stride-3; x > 0; --x) // @@1b
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{
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int p0 = m_output[dst];
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int py = m_output[dst+Stride] - p0;
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int px = m_output[dst+3] - p0;
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p0 = Math.Abs (px + py);
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py = Math.Abs (py);
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px = Math.Abs (px);
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byte pv;
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if (p0 >= px && py >= px)
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pv = m_output[dst+Stride];
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else if (p0 < py)
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pv = m_output[dst];
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else
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pv = m_output[dst+3];
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m_output[dst+Stride+3] += (byte)(pv + 0x80);
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++dst;
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}
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dst += 3;
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}
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dst = 0;
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for (uint i = 0; i < m_pixels; ++i)
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{
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sbyte b = -128;
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sbyte r = -128;
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b += (sbyte)m_output[dst];
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r += (sbyte)m_output[dst+2];
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int g = m_output[dst+1] - ((b + r) >> 2);
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m_output[dst++] = (byte)(b + g);
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m_output[dst++] = (byte)g;
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m_output[dst++] = (byte)(r + g);
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}
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}
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}
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}
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