Add support Digital Works PS2 PAC

ArcFormats/ArcFormats.csproj

@@ -131,6 +131,7 @@
     <Compile Include="Artemis\ImageNekoPNG.cs" />
     <Compile Include="CsWare\AudioWAV.cs" />
     <Compile Include="CsWare\ImageGDT.cs" />
+    <Compile Include="DigitalWorks\ArcPACPS2.cs" />
     <Compile Include="DxLib\HuffmanDecoder.cs" />
     <Compile Include="DxLib\WidgetDXA.xaml.cs">
       <DependentUpon>WidgetDXA.xaml</DependentUpon>
@@ -1335,4 +1336,4 @@ xcopy "$(ProjectDir)\Resources\Formats.dat" "$(TargetDir)\GameData\" /D /Y &gt;N
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
+</Project>

ArcFormats/DigitalWorks/ArcPACPS2.cs

@@ -0,0 +1,98 @@
+//! \file       ArcPACPS2.cs
+//! \date       2018 Sep 18
+//! \brief      Digital Works PS2 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.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.IO;
+using GameRes.Compression;
+
+namespace GameRes.Formats.DigitalWorks
+{
+    [Export(typeof(ArchiveFormat))]
+    public class PacPS2Opener : ArchiveFormat
+    {
+        public override string         Tag { get { return "PAC/PS2"; } }
+        public override string Description { get { return "Digital Works PS2 resource archive"; } }
+        public override uint     Signature { get { return 0x434150; } } // 'PAC'
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool      CanWrite { get { return false; } }
+
+        /**
+         Target games:
+        Cafe Little Wish SLPM-65294
+        F Fanatic SLPM-65296
+         */
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            uint filename_index = file.View.ReadUInt32(4);
+            int count = file.View.ReadInt32(8);
+            uint index_offset = 0x0C;
+            
+            if (!IsSaneCount (count))
+                return null;
+
+            var dir = new List<Entry> (count);
+            int i = 0;
+            while (i < count)
+            {
+                var name = file.View.ReadString (filename_index + i * 0x40, 0x40);
+                var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
+                entry.Offset = file.View.ReadUInt32 (index_offset + i * 8);
+                entry.Size   = file.View.ReadUInt32 (index_offset + i * 8 + 4);
+                if (!entry.CheckPlacement (file.MaxOffset))
+                    return null;
+                dir.Add (entry);
+                i++;
+            }
+            return new ArcFile (file, this, dir);    
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var pent = entry as PackedEntry;
+            if (null == pent)
+                return base.OpenEntry (arc, entry);
+            if (!pent.IsPacked)
+            {
+                if (!arc.File.View.AsciiEqual (entry.Offset, "LZS\0"))
+                    return base.OpenEntry (arc, entry);
+                pent.IsPacked = true;
+                pent.UnpackedSize = arc.File.View.ReadUInt32 (entry.Offset+4);
+            }
+            var input = arc.File.CreateStream (entry.Offset+8, entry.Size-8);
+            bool embedded_lzs = (input.Signature & ~0xF0u) == 0x535A4C0F; // 'LZS'
+            var lzs = new LzssStream (input);
+            if (embedded_lzs)
+            {
+                var header = new byte[8];
+                lzs.Read (header, 0, 8);
+                pent.UnpackedSize = header.ToUInt32 (4);
+                lzs = new LzssStream (lzs);
+            }
+            return lzs;
+        }
+    }
+}