(Kaguya): implemented AF01 archive.

ArcFormats/ArcFormats.csproj

@@ -228,6 +228,7 @@
     <Compile Include="Interheart\ArcFPK2.cs" />
     <Compile Include="Interheart\ImageCandy.cs" />
     <Compile Include="Ivory\ArcSG.cs" />
+    <Compile Include="Kaguya\ArcAF.cs" />
     <Compile Include="Kaguya\ArcPL00.cs" />
     <Compile Include="Kaguya\ArcPL10.cs" />
     <Compile Include="Kaguya\ArcPLT.cs" />

ArcFormats/Kaguya/ArcAF.cs

@@ -0,0 +1,133 @@
+//! \file       ArcAF.cs
+//! \date       Sun Apr 02 09:01:51 2017
+//! \brief      Atelier Kaguya resource archive.
+//
+// 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;
+
+namespace GameRes.Formats.Kaguya
+{
+    [Export(typeof(ArchiveFormat))]
+    public class AfOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "ARC/AF01"; } }
+        public override string Description { get { return "Atelier Kaguya resource archive"; } }
+        public override uint     Signature { get { return 0x31304641; } } // 'AF01'
+        public override bool  IsHierarchic { get { return true; } }
+        public override bool      CanWrite { get { return false; } }
+
+        const int MaxFileNameLength = 0x100;
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            uint index_offset = file.View.ReadUInt32 (8);
+            if (index_offset >= file.MaxOffset - 8)
+                return null;
+            using (var index = file.CreateStream (index_offset + 8))
+            {
+                long data_offset = 12;
+                var name_buffer = new byte[MaxFileNameLength];
+                var dir = new List<Entry>();
+                while (index.PeekByte() != -1)
+                {
+                    int name_length = index.ReadInt32();
+                    if (name_length <= 0 || name_length > name_buffer.Length)
+                        return null;
+                    if (name_length != index.Read (name_buffer, 0, name_length))
+                        return null;
+                    var name = DecryptString (name_buffer, name_length);
+                    name = name.TrimStart ('\\', '/');
+                    var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
+                    int flags = index.ReadInt16();
+                    entry.IsPacked = 1 == flags;
+                    data_offset += 4 + name_length + 6;
+                    if (entry.IsPacked)
+                        data_offset += 4;
+                    entry.Offset = data_offset;
+                    entry.Size = index.ReadUInt32();
+                    entry.UnpackedSize = index.ReadUInt32();
+                    if (!entry.IsPacked)
+                        entry.Size = entry.UnpackedSize;
+                    if (!entry.CheckPlacement (file.MaxOffset))
+                        return null;
+                    dir.Add (entry);
+                    data_offset += entry.Size;
+                }
+                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 arc.File.CreateStream (entry.Offset, entry.Size);
+            using (var input = arc.File.CreateStream (entry.Offset, entry.Size))
+            {
+                var output = new byte[pent.UnpackedSize];
+                LzUnpack (input, output);
+                return new BinMemoryStream (output);
+            }
+        }
+
+        string DecryptString (byte[] name, int length)
+        {
+            for (int i = 0; i < length; ++i)
+                name[i] ^= 0xFF;
+            return Encodings.cp932.GetString (name, 0, length);
+        }
+
+        void LzUnpack (Stream input, byte[] output)
+        {
+            var frame = new byte[0x1000];
+            int frame_pos = 1;
+            int dst = 0;
+            using (var bits = new MsbBitStream (input))
+            {
+                while (dst < output.Length)
+                {
+                    if (0 != bits.GetNextBit ())
+                    {
+                        byte b = (byte)bits.GetBits (8);
+                        output[dst++] = b;
+                        frame[frame_pos++ & 0xFFF] = b;
+                    }
+                    else
+                    {
+                        int offset = bits.GetBits (12);
+                        int count = bits.GetBits (4) + 2;
+                        for (int i = 0; i < count; ++i)
+                        {
+                            byte b = frame[(offset + i) & 0xFFF];
+                            output[dst++] = b;
+                            frame[frame_pos++ & 0xFFF] = b;
+                        }
+                    }
+                }
+            }
+        }
+    }
+}