implemented X[iks] resource archive format.

ArcFormats/ArcFormats.csproj

@@ -91,6 +91,7 @@
     <Compile Include="ArcGSP.cs" />
     <Compile Include="ArcGsPack.cs" />
     <Compile Include="ArcIFL.cs" />
+    <Compile Include="ArcIKS.cs" />
     <Compile Include="ArcInnGrey.cs" />
     <Compile Include="ArcINT.cs" />
     <Compile Include="ArcISA.cs" />

ArcFormats/ArcIKS.cs

@@ -0,0 +1,124 @@
+//! \file       ArcIKS.cs
+//! \date       Wed Jul 08 07:07:09 2015
+//! \brief      [IKS] archives implementation.
+//
+// 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.Linq;
+using System.Security.Cryptography;
+using GameRes.Utility;
+
+namespace GameRes.Formats.X
+{
+    [Export(typeof(ArchiveFormat))]
+    public class IksOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "IKS"; } }
+        public override string Description { get { return "X[iks] resource archive"; } }
+        public override uint     Signature { get { return 0x5253504E; } } // 'NPSR'
+        public override bool  IsHierarchic { get { return false; } }
+        public override bool     CanCreate { get { return false; } }
+
+        public static Dictionary<string, byte> KnownKeys = new Dictionary<string, byte>() {
+            { "Shikkan ~Hazukashimerareta Karada, Oreta Kokoro~", 0x66 },
+        };
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            int count = file.View.ReadInt32 (4);
+            if (count <= 0 || count > 0xfffff)
+                return null;
+            uint index_offset = 0x10;
+            uint index_size = (uint)(0x28 * count);
+            if (index_size > file.View.Reserve (index_offset, index_size))
+                return null;
+            long data_offset = index_offset + index_size;
+            var dir = new List<Entry> (count);
+            var name_buffer = new byte[0x18];
+            for (int i = 0; i < count; ++i)
+            {
+                byte name_length = Math.Min ((byte)0x17, file.View.ReadByte (index_offset));
+                if (name_length > name_buffer.Length)
+                    return null;
+                file.View.Read (index_offset+1, name_buffer, 0, name_length);
+                string name = Encodings.cp932.GetString (name_buffer, 0, name_length);
+                var entry = FormatCatalog.Instance.CreateEntry (name);
+                entry.Offset = file.View.ReadUInt32 (index_offset+0x20);
+                entry.Size   = file.View.ReadUInt32 (index_offset+0x1C);
+                if (entry.Offset < data_offset || !entry.CheckPlacement (file.MaxOffset))
+                    return null;
+                dir.Add (entry);
+                index_offset += 0x28;
+            }
+            return new ArcFile (file, this, dir);
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            byte key = KnownKeys.First().Value;
+            var input = arc.File.CreateStream (entry.Offset, entry.Size);
+            return new CryptoStream (input, new XorTransform (key), CryptoStreamMode.Read);
+        }
+    }
+
+    public sealed class XorTransform : ICryptoTransform
+    {
+        private const int BlockSize = 256;
+        private byte m_key;
+
+        public bool          CanReuseTransform { get { return true; } }
+        public bool CanTransformMultipleBlocks { get { return true; } }
+        public int              InputBlockSize { get { return BlockSize; } }
+        public int             OutputBlockSize { get { return BlockSize; } }
+
+        public XorTransform (byte key)
+        {
+            m_key = key;
+        }
+
+        public int TransformBlock (byte[] inputBuffer, int inputOffset, int inputCount,
+                                   byte[] outputBuffer, int outputOffset)
+        {
+            for (int i = 0; i < inputCount; ++i)
+            {
+                outputBuffer[outputOffset++] = (byte)(m_key ^ inputBuffer[inputOffset+i]);
+            }
+            return inputCount;
+        }
+
+        public byte[] TransformFinalBlock (byte[] inputBuffer, int inputOffset, int inputCount)
+        {
+            byte[] outputBuffer = new byte[inputCount];
+            TransformBlock (inputBuffer, inputOffset, inputCount, outputBuffer, 0);
+            return outputBuffer;
+        }
+
+        public void Dispose ()
+        {
+            System.GC.SuppressFinalize (this);
+        }
+    }
+}

ArcFormats/Properties/AssemblyInfo.cs

@@ -32,5 +32,5 @@ using System.Runtime.InteropServices;
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion ("1.0.7.74")]
-[assembly: AssemblyFileVersion ("1.0.7.74")]
+[assembly: AssemblyVersion ("1.0.7.75")]
+[assembly: AssemblyFileVersion ("1.0.7.75")]

supported.html

@@ -238,6 +238,7 @@ Jokei Kazoku ~Inbou~<br/>
 </td></tr>
 <tr><td>*.gcc</td><td><tt>G24n</tt><br/><tt>G24m</tt><br/><tt>R24n</tt><br/><tt>R24m</tt></td><td>No</td></tr>
 <tr class="odd"><td>*.arc</td><td>-</td><td>No</td><td>Tumugi</td><td>Kimi no Omoi, Sono Negai</td></tr>
+<tr><td>*.iks</td><td><tt>NPSR</tt></td><td>No</td><td>X[iks]</td><td>Shikkan ~Hazukashimerareta Karada, Oreta Kokoro~</td></tr>
 </table>
 <p><a name="note-1">[1]</a> Non-encrypted only</p>
 </body>