(Legacy): implemented VCT archives.

Legacy/Legacy.csproj

@@ -114,6 +114,7 @@
     <Compile Include="System21\ImageBET.cs" />
     <Compile Include="SystemAqua\ArcDAT.cs" />
     <Compile Include="Tsd\ArcMCD.cs" />
+    <Compile Include="Unison\ArcVCT.cs" />
     <Compile Include="Unknown\ArcDAT.cs" />
     <Compile Include="Uran\ArcNCL.cs" />
     <Compile Include="Uran\ArcPHS.cs" />

Legacy/Unison/ArcVCT.cs

@@ -0,0 +1,138 @@
+//! \file       ArcVCT.cs
+//! \date       2018 Feb 17
+//! \brief      Unison Shift resource archive.
+//
+// Copyright (C) 2018 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;
+
+// [000225][Unison Shift] Moe ~Moegiiro no Machi~
+
+namespace GameRes.Formats.Unison
+{
+    [Export(typeof(ArchiveFormat))]
+    public class VctOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "VCT"; } }
+        public override string Description { get { return "Unison Shift resource archive"; } }
+        public override uint     Signature { get { return 0; } }
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            int idx_count = file.View.ReadByte (0);
+            if (0 == idx_count)
+                return null;
+            int index_offset = 1 + idx_count * 3;
+            int count = file.View.ReadInt32 (index_offset);
+            if (!IsSaneCount (count))
+                return null;
+            index_offset += 4;
+            uint index_size = (uint)count * 0x20;
+            if (index_size > file.View.Reserve (index_offset, index_size))
+                return null;
+
+            var dir = new List<Entry> (count);
+            for (int i = 0; i < count; ++i)
+            {
+                string name = file.View.ReadString (index_offset, 0x14).TrimEnd();
+                string ext  = file.View.ReadString (index_offset+0x14, 3);
+                if (!string.IsNullOrWhiteSpace (ext))
+                    name += '.' + ext;
+                var entry = FormatCatalog.Instance.Create<Entry> (name);
+                entry.Offset = file.View.ReadUInt32 (index_offset+0x18);
+                entry.Size   = file.View.ReadUInt32 (index_offset+0x1C);
+                if (!entry.CheckPlacement (file.MaxOffset))
+                    return null;
+                dir.Add (entry);
+                index_offset += 0x20;
+            }
+            return new ArcFile (file, this, dir);
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            if (!arc.File.View.AsciiEqual (entry.Offset, "LZS\0"))
+                return base.OpenEntry (arc, entry);
+            using (var input = arc.File.CreateStream (entry.Offset, entry.Size))
+            {
+                var data = LzsUnpack (input);
+                if (data.AsciiEqual ("BM") && 32 == data.ToUInt16 (0x1C))
+                    FixBitmapAlpha (data);
+                return new BinMemoryStream (data, entry.Name);
+            }
+        }
+
+        byte[] LzsUnpack (IBinaryStream input)
+        {
+            input.ReadInt32();
+            int unpacked_size = input.ReadInt32();
+            int packed_size = input.ReadInt32();
+            int ctl_size = input.ReadInt32();
+            var ctl = input.ReadBytes (ctl_size);
+            var output = new byte[unpacked_size];
+            var frame = new byte[0x1000];
+            int frame_pos = 1;
+            int src = 0;
+            int dst = 0;
+            int bits = 2;
+            while (dst < unpacked_size)
+            {
+                bits >>= 1;
+                if (1 == bits)
+                {
+                    bits = ctl[src++] | 0x100;
+                }
+                if (0 != (bits & 1))
+                {
+                    output[dst++] = frame[frame_pos++ & 0xFFF] = input.ReadUInt8();
+                }
+                else
+                {
+                    int offset = input.ReadUInt16();
+                    int count = (offset >> 12) + 2;
+                    while (count --> 0)
+                    {
+                        byte b = frame[offset++ & 0xFFF];
+                        output[dst++] = frame[frame_pos++ & 0xFFF] = b;
+                    }
+                }
+            }
+            return output;
+        }
+
+        void FixBitmapAlpha (byte[] bmp)
+        {
+            for (int pos = bmp.ToInt32 (0xA); pos < bmp.Length; pos += 4)
+            {
+                byte r = bmp[pos];
+                bmp[pos] = bmp[pos+2];
+                bmp[pos+2] = r;
+                bmp[pos+3] ^= 0xFF;
+            }
+        }
+    }
+}