multi-frame HG-3 images could be opened as archives now.

ArcFormats/ArcFormats.csproj

@@ -65,6 +65,8 @@
     <Compile Include="ArcDX.cs" />
     <Compile Include="ArcMiris.cs" />
     <Compile Include="BitStream.cs" />
+    <Compile Include="CatSystem\ArcHG3.cs" />
+    <Compile Include="Cherry\ArcMyk.cs" />
     <Compile Include="Debonosu\ArcPAK.cs" />
     <Compile Include="elf\ImageG24.cs" />
     <Compile Include="elf\ImageGP8.cs" />

ArcFormats/CatSystem/ArcHG3.cs

@@ -0,0 +1,106 @@
+//! \file       ArcHG3.cs
+//! \date       Mon Oct 12 22:34:11 2015
+//! \brief      CatSystem2 image resource.
+//
+// Copyright (C) 2015 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;
+using GameRes.Utility;
+using GameRes.Compression;
+
+namespace GameRes.Formats.CatSystem
+{
+    [Export(typeof(ArchiveFormat))]
+    public class Hg3Opener : ArchiveFormat
+    {
+        public override string         Tag { get { return "HG3"; } }
+        public override string Description { get { return "CatSystem2 engine multi-image"; } }
+        public override uint     Signature { get { return 0x332d4748; } } // 'HG-3'
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool     CanCreate { get { return false; } }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            var base_name = Path.GetFileNameWithoutExtension (file.Name);
+            var dir = new List<Entry>();
+            long offset = 0xC;
+            int i = 0;
+            while (offset+0x14 < file.MaxOffset && file.View.AsciiEqual (offset+8, "stdinfo"))
+            {
+                uint section_size = file.View.ReadUInt32 (offset);
+                if (0 == section_size)
+                    section_size = (uint)(file.MaxOffset - offset);
+                uint stdinfo_size = file.View.ReadUInt32 (offset+0x10);
+                if (file.View.AsciiEqual (offset+8+stdinfo_size, "img0000"))
+                {
+                    var entry = new Entry
+                    {
+                        Name = string.Format ("{0}#{1:D4}.tga", base_name, i),
+                        Type = "image",
+                        Offset = offset + 8,
+                        Size = section_size - 8,
+                    };
+                    dir.Add (entry);
+                }
+                offset += section_size;
+                ++i;
+            }
+            if (dir.Count < 2)
+                return null;
+            return new ArcFile (file, this, dir);
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            // emulate TGA image
+            var offset = entry.Offset+8;
+            var info = new Hg3MetaData
+            {
+                HeaderSize = arc.File.View.ReadUInt32 (offset),
+                Width   = arc.File.View.ReadUInt32 (offset+8),
+                Height  = arc.File.View.ReadUInt32 (offset+0xC),
+                BPP     = arc.File.View.ReadInt32 (offset+0x10),
+                OffsetX = arc.File.View.ReadInt32 (offset+0x14),
+                OffsetY = arc.File.View.ReadInt32 (offset+0x18),
+                CanvasWidth = arc.File.View.ReadUInt32 (offset+0x1C),
+                CanvasHeight = arc.File.View.ReadUInt32 (offset+0x20),
+            };
+            using (var input = arc.File.CreateStream (entry.Offset, entry.Size))
+            using (var reader = new Hg3Reader (input, info))
+            {
+                var pixels = reader.Unpack();
+                var header = new byte[0x12];
+                header[2] = 2;
+                LittleEndian.Pack ((short)info.OffsetX, header, 8);
+                LittleEndian.Pack ((short)info.OffsetY, header, 0xa);
+                LittleEndian.Pack ((ushort)info.Width,  header, 0xc);
+                LittleEndian.Pack ((ushort)info.Height, header, 0xe);
+                header[0x10] = (byte)info.BPP;
+                return new PrefixStream (header, new MemoryStream (pixels));
+            }
+        }
+    }
+}