implemented AI6WIN ARC archives and AKB images.

ArcFormats/ArcFormats.csproj

@@ -79,6 +79,8 @@
     <Compile Include="Propeller\ArcMGR.cs" />
     <Compile Include="Propeller\ArcMPK.cs" />
     <Compile Include="Propeller\ImageMGR.cs" />
+    <Compile Include="Silky\ArcAi6Win.cs" />
+    <Compile Include="Silky\ImageAKB.cs" />
     <Compile Include="StudioEgo\ArcPAK0.cs" />
     <Compile Include="TechnoBrain\ImageIPH.cs" />
     <Compile Include="ArcDX.cs" />

ArcFormats/Silky/ArcAi6Win.cs

@@ -0,0 +1,98 @@
+//! \file       ArcAi6Win.cs
+//! \date       Sat Nov 28 12:44:51 2015
+//! \brief      Ai6Win engine resource archive
+//
+// 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.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.IO;
+using GameRes.Compression;
+using GameRes.Utility;
+
+namespace GameRes.Formats.Silky
+{
+    [Export(typeof(ArchiveFormat))]
+    public class Ai6Opener : ArchiveFormat
+    {
+        public override string         Tag { get { return "ARC/AI6WIN"; } }
+        public override string Description { get { return "AI6WIN engine resource archive"; } }
+        public override uint     Signature { get { return 0; } }
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool     CanCreate { get { return false; } }
+
+        public Ai6Opener ()
+        {
+            Extensions = new string[] { "arc" };
+        }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            int count = file.View.ReadInt32 (0);
+            if (!IsSaneCount (count))
+                return null;
+            long index_offset = 4;
+            uint index_size = (uint)(count * (0x104 + 8));
+            if (index_size > file.View.Reserve (index_offset, index_size))
+                return null;
+            var name_buffer = new byte[0x104];
+            var dir = new List<Entry>();
+            for (int i = 0; i < count; ++i)
+            {
+                file.View.Read (index_offset, name_buffer, 0, (uint)name_buffer.Length);
+                int name_length = 0;
+                while (name_length < name_buffer.Length && 0 != name_buffer[name_length])
+                    ++name_length;
+                if (0 == name_length)
+                    return null;
+                byte key = (byte)(name_length+1);
+                for (int j = 0; j < name_length; ++j)
+                {
+                    name_buffer[j] -= key--;
+                    if (name_buffer[j]  < 0x20)
+                        return null;
+                }
+                var name = Encodings.cp932.GetString (name_buffer, 0, name_length);
+                index_offset += 0x104;
+                var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
+                entry.Size          = Binary.BigEndian (file.View.ReadUInt32 (index_offset));
+                entry.UnpackedSize  = Binary.BigEndian (file.View.ReadUInt32 (index_offset+4));
+                entry.Offset        = Binary.BigEndian (file.View.ReadUInt32 (index_offset+8));
+                if (entry.Offset < index_size+4 || !entry.CheckPlacement (file.MaxOffset))
+                    return null;
+                entry.IsPacked = entry.Size != entry.UnpackedSize;
+                dir.Add (entry);
+                index_offset += 12;
+            }
+            return new ArcFile (file, this, dir);
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var pent = entry as PackedEntry;
+            if (null == pent || !pent.IsPacked)
+                return base.OpenEntry (arc, entry);
+            var input = arc.File.CreateStream (entry.Offset, entry.Size);
+            return new LzssStream (input);
+        }
+    }
+}

ArcFormats/Silky/ImageAKB.cs

@@ -0,0 +1,139 @@
+//! \file       ImageAKB.cs
+//! \date       Sat Nov 28 13:09:20 2015
+//! \brief      Ai6Win engine image format.
+//
+// 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 GameRes.Compression;
+using GameRes.Utility;
+using System;
+using System.ComponentModel.Composition;
+using System.IO;
+using System.Windows.Media;
+
+namespace GameRes.Formats.Silky
+{
+    internal class AkbMetaData : ImageMetaData
+    {
+        public byte[]   Background;
+        public int      InnerWidth;
+        public int      InnerHeight;
+    }
+
+    [Export(typeof(ImageFormat))]
+    public class AkbFormat : ImageFormat
+    {
+        public override string         Tag { get { return "AKB"; } }
+        public override string Description { get { return "AI6WIN engine image format"; } }
+        public override uint     Signature { get { return 0x20424B41; } } // 'AKB '
+
+        public override ImageMetaData ReadMetaData (Stream stream)
+        {
+            using (var reader = new ArcView.Reader (stream))
+            {
+                reader.ReadInt32();
+                var info = new AkbMetaData();
+                info.Width = reader.ReadUInt16();
+                info.Height = reader.ReadUInt16();
+                int flags = reader.ReadInt32() & 0xFFFF;
+                info.BPP = 0 == flags ? 32 : 24;
+                info.Background = reader.ReadBytes (4);
+                info.OffsetX = reader.ReadInt32();
+                info.OffsetY = reader.ReadInt32();
+                info.InnerWidth = reader.ReadInt32() - info.OffsetX;
+                info.InnerHeight = reader.ReadInt32() - info.OffsetY;
+                if (info.InnerWidth > info.Width || info.InnerHeight > info.Height)
+                    return null;
+                return info;
+            }
+        }
+
+        public override ImageData Read (Stream stream, ImageMetaData info)
+        {
+            var meta = (AkbMetaData)info;
+            int pixel_size = meta.BPP / 8;
+            int stride = (int)meta.Width * pixel_size;
+            byte[] image;
+            if (meta.InnerWidth != 0 && meta.InnerHeight != 0)
+            {
+                stream.Position = 0x20;
+                int inner_stride = meta.InnerWidth * pixel_size;
+                var pixels = new byte[meta.InnerHeight * inner_stride];
+                using (var lz = new LzssStream (stream, LzssMode.Decompress, true))
+                {
+                    for (int dst = pixels.Length - inner_stride; dst >= 0; dst -= inner_stride)
+                    {
+                        if (inner_stride != lz.Read (pixels, dst, inner_stride))
+                            throw new InvalidFormatException();
+                    }
+                }
+                int src = 0;
+                for (int i = pixel_size; i < inner_stride; ++i)
+                    pixels[i] += pixels[src++];
+                src = 0;
+                for (int i = inner_stride; i < pixels.Length; ++i)
+                    pixels[i] += pixels[src++];
+                if (meta.InnerWidth != meta.Width || meta.InnerHeight != meta.Height)
+                {
+                    image = CreateBackground (meta);
+                    src = 0;
+                    int dst = meta.OffsetY * stride + meta.OffsetX * pixel_size;
+                    for (int y = 0; y < meta.InnerHeight; ++y)
+                    {
+                        Buffer.BlockCopy (pixels, src, image, dst, inner_stride);
+                        dst += stride;
+                        src += inner_stride;
+                    }
+                }
+                else
+                {
+                    image = pixels;
+                }
+            }
+            else
+            {
+                image = CreateBackground (meta);
+            }
+            var format = 24 == meta.BPP ? PixelFormats.Bgr24 : PixelFormats.Bgra32;
+            return ImageData.Create (info, format, null, image, stride);
+        }
+
+        private byte[] CreateBackground (AkbMetaData info)
+        {
+            int pixel_size = info.BPP / 8;
+            int stride = (int)info.Width * pixel_size;
+            var pixels = new byte[stride * (int)info.Height];
+            if (0 != LittleEndian.ToInt32 (info.Background, 0))
+            {
+                for (int i = 0; i < stride; i += pixel_size)
+                    Buffer.BlockCopy (info.Background, 0, pixels, i, pixel_size);
+                Binary.CopyOverlapped (pixels, 0, stride, pixels.Length-stride);
+            }
+            return pixels;
+        }
+
+        public override void Write (Stream file, ImageData image)
+        {
+            throw new System.NotImplementedException ("AkbFormat.Write not implemented");
+        }
+    }
+}

supported.html

@@ -533,6 +533,10 @@ Tama Tama ~Tonari no Kanojo...<br/>
 Tama Tama Christmas Box<br/>
 </td></tr>
 <tr><td>*.mag</td><td>-</td><td>No</td></tr>
+<tr class="odd"><td>*.arc</td><td>-</td><td>No</td><td rowspan="2">AI6WIN</td><td rowspan="2">
+Gakuen Saimin Reido<br/>
+</td></tr>
+<tr class="odd"><td>*.akb</td><td><tt>AKB</tt></td><td>No</td></tr>
 </table>
 <p><a name="note-1" class="footnote">1</a> Non-encrypted only</p>
 </body>