(Legacy): implemented MGO images.

Legacy/Legacy.csproj

@@ -44,6 +44,7 @@
     <Reference Include="System" />
     <Reference Include="System.ComponentModel.Composition" />
     <Reference Include="System.Core" />
+    <Reference Include="System.Xaml" />
     <Reference Include="System.Xml.Linq" />
     <Reference Include="System.Data.DataSetExtensions" />
     <Reference Include="Microsoft.CSharp" />
@@ -67,6 +68,7 @@
     <Compile Include="Dice\ImageRBP.cs" />
     <Compile Include="Factor\ArcRES.cs" />
     <Compile Include="Kurumi\ArcMPK.cs" />
+    <Compile Include="Melody\ImageMGO.cs" />
     <Compile Include="Mink\ImageGDF.cs" />
     <Compile Include="Nabe\ImageYPF.cs" />
     <Compile Include="Nanami\ArcBMM.cs" />

Legacy/Melody/ImageMGO.cs

@@ -0,0 +1,153 @@
+//! \file       ImageMGO.cs
+//! \date       2017 Dec 31
+//! \brief      Melody compressed image.
+//
+// Copyright (C) 2017 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 System.Windows.Media.Imaging;
+using GameRes.Compression;
+
+namespace GameRes.Formats.Melody
+{
+    internal class MgoMetaData : ImageMetaData
+    {
+        public int  UnpackedSize;
+        public int  BmpOffset;
+    }
+
+    [Export(typeof(ImageFormat))]
+    public class MgoFormat : ImageFormat
+    {
+        public override string         Tag { get { return "MGO"; } }
+        public override string Description { get { return "Melody compressed bitmap"; } }
+        public override uint     Signature { get { return 0x424F474D; } } // 'MGOB'
+
+        public override ImageMetaData ReadMetaData (IBinaryStream file)
+        {
+            var header = file.ReadHeader (12);
+            if (header.ToInt32 (4) != 5)
+                return null;
+            using (var lzss = new PackedStream<LzssDecompressor> (file.AsStream, true))
+            using (var stream = new SeekableStream (lzss))
+            using (var mgo = new BinaryStream (stream, file.Name))
+            {
+                var name = mgo.ReadCString();
+                mgo.Position = ((int)(mgo.Position - 1) & ~3) + 4;
+                int count = mgo.ReadInt32();
+                mgo.Seek (count * 0x10, SeekOrigin.Current);
+                int bmp_position = (int)mgo.Position;
+                var bmp_header = mgo.ReadBytes (0x36);
+                if (!bmp_header.AsciiEqual ("BM"))
+                    return null;
+                return new MgoMetaData {
+                    Width = bmp_header.ToUInt32 (0x12),
+                    Height = bmp_header.ToUInt32 (0x16),
+                    BPP = bmp_header.ToInt32 (0x1C),
+                    UnpackedSize = header.ToInt32 (8),
+                    BmpOffset = bmp_position,
+                };
+            }
+        }
+
+        public override ImageData Read (IBinaryStream file, ImageMetaData info)
+        {
+            var meta = (MgoMetaData)info;
+            file.Position = 12;
+            using (var lzss = new PackedStream<LzssDecompressor> (file.AsStream, true))
+            {
+                var header = new byte[meta.BmpOffset];
+                lzss.Read (header, 0, header.Length);
+                var decoder = new BmpBitmapDecoder (lzss,
+                    BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
+                var frame = decoder.Frames[0];
+                frame.Freeze();
+                return new ImageData (frame, info);
+            }
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("MgoFormat.Write not implemented");
+        }
+    }
+
+    internal class LzssDecompressor : Decompressor
+    {
+        LsbBitStream        m_input;
+
+        public override void Initialize (Stream input)
+        {
+            m_input = new LsbBitStream (input, true);
+        }
+
+        protected override IEnumerator<int> Unpack ()
+        {
+            byte[] frame = new byte[0x1000];
+            int frame_pos = 1;
+            for (;;)
+            {
+                int ctl = m_input.GetNextBit();
+                if (-1 == ctl)
+                    yield break;
+                if (ctl != 0)
+                {
+                    byte v = (byte)m_input.GetBits (8);
+                    m_buffer[m_pos++] = frame[frame_pos++ & 0xFFF] = v;
+                    if (0 == --m_length)
+                        yield return m_pos;
+                }
+                else
+                {
+                    int offset = m_input.GetBits (12);
+                    if (-1 == offset)
+                        yield break;
+                    int count = m_input.GetBits (4) + 2;
+                    while (count --> 0)
+                    {
+                        byte v = frame[offset++ & 0xFFF];
+                        m_buffer[m_pos++] = frame[frame_pos++ & 0xFFF] = v;
+                        if (0 == --m_length)
+                            yield return m_pos;
+                    }
+                }
+            }
+        }
+
+        #region IDisposable Members
+        bool m_disposed = false;
+        protected override void Dispose (bool disposing)
+        {
+            if (!m_disposed)
+            {
+                base.Dispose (disposing);
+                if (disposing && m_input != null)
+                    m_input.Dispose();
+                m_disposed = true;
+            }
+        }
+        #endregion
+    }
+}