implemented PKG archive variation.

ArcFormats/ArcFormats.csproj

@@ -548,6 +548,7 @@
     <Compile Include="Xuse\ArcXuse.cs" />
     <Compile Include="YaneSDK\ArcDAT.cs" />
     <Compile Include="Yatagarasu\ArcPKG.cs" />
+    <Compile Include="Yatagarasu\ArcPKG2.cs" />
     <Compile Include="Youkai\ArcDAT.cs" />
     <Compile Include="Yox\ArcYOX.cs" />
     <Compile Include="Yuka\ArcYKC.cs" />

ArcFormats/Yatagarasu/ArcPKG.cs

@@ -23,7 +23,6 @@
 // IN THE SOFTWARE.
 //
 
-using System;
 using System.Collections.Generic;
 using System.ComponentModel.Composition;
 using System.IO;

ArcFormats/Yatagarasu/ArcPKG2.cs

@@ -0,0 +1,154 @@
+//! \file       ArcPKG2.cs
+//! \date       Wed Apr 12 03:03:20 2017
+//! \brief      Yatagarasu resource archive with different encryption method.
+//
+// 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;
+using System.Linq;
+
+namespace GameRes.Formats.Yatagarasu
+{
+    [Export(typeof(ArchiveFormat))]
+    public class Pkg2Opener : ArchiveFormat
+    {
+        public override string         Tag { get { return "PKG/2"; } }
+        public override string Description { get { return "Yatagarasu resource archive v2"; } }
+        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)
+        {
+            if (!file.Name.HasExtension (".pkg"))
+                return null;
+            uint first_key = file.View.ReadUInt32 (0) ^ (uint)file.MaxOffset;
+            foreach (var key in KnownKeys.Values.Where (k => k[0] == first_key))
+            {
+                int count = (int)(file.View.ReadUInt32 (4) ^ key[0]);
+                if (!IsSaneCount (count))
+                    continue;
+                try
+                {
+                    var arc = ReadIndex (file, key, count);
+                    if (arc != null)
+                        return arc;
+                }
+                catch { /* ignore parse errors caused by incorrect key */ }
+            }
+            return null;
+        }
+
+        ArcFile ReadIndex (ArcView file, uint[] key, int count)
+        {
+            using (var input = file.CreateStream (8, (uint)count * 0x80u))
+            using (var dec = new ByteStringEncryptedStream (input, GetKeyBytes (key)))
+            using (var index = new BinaryStream (dec, file.Name))
+            {
+                var dir = new List<Entry> (count);
+                for (int i = 0; i < count; ++i)
+                {
+                    var name = index.ReadCString (0x74);
+                    if (0 == name.Length)
+                        return null;
+                    var entry = FormatCatalog.Instance.Create<Pkg2Entry> (name);
+                    entry.Size = index.ReadUInt32();
+                    entry.Offset = index.ReadUInt32();
+                    entry.EncryptedSize = index.ReadUInt32();
+                    if (!entry.CheckPlacement (file.MaxOffset))
+                        return null;
+                    dir.Add (entry);
+                }
+                return new Pkg2Archive (file, this, dir, key);
+            }
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var pkg_arc = (Pkg2Archive)arc;
+            var pkg_ent = (Pkg2Entry)entry;
+            var data = new byte[(pkg_ent.Size + 3) & ~3];
+            arc.File.View.Read (pkg_ent.Offset, data, 0, pkg_ent.Size);
+
+            uint encrypted_size = pkg_ent.EncryptedSize;
+            if (0 == encrypted_size || encrypted_size > pkg_ent.Size)
+                encrypted_size = pkg_ent.Size;
+            unsafe
+            {
+                fixed (byte* data8 = data)
+                {
+                    uint* data32 = (uint*)data8;
+                    uint count = (encrypted_size + 3) / 4;
+                    uint mask = (entry.Size / 4) & 7;
+                    for (uint i = 0; i < count; ++i)
+                        data32[i] ^= pkg_arc.Key[i & mask];
+                }
+            }
+            return new BinMemoryStream (data, 0, (int)entry.Size);
+        }
+
+        static byte[] GetKeyBytes (uint[] key)
+        {
+            var bytes = new byte[sizeof(uint) * key.Length];
+            Buffer.BlockCopy (key, 0, bytes, 0, bytes.Length);
+            return bytes;
+        }
+
+        PkgScheme m_scheme = new PkgScheme { KnownKeys = new Dictionary<string, uint[]>() };
+
+        public IDictionary<string, uint[]> KnownKeys
+        {
+            get { return m_scheme.KnownKeys; }
+        }
+
+        public override ResourceScheme Scheme
+        {
+            get { return m_scheme; }
+            set { m_scheme = (PkgScheme)value; }
+        }
+    }
+
+    internal class Pkg2Archive : ArcFile
+    {
+        public readonly uint[] Key;
+
+        public Pkg2Archive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, uint[] key)
+            : base (arc, impl, dir)
+        {
+            Key = key;
+        }
+    }
+
+    internal class Pkg2Entry : Entry
+    {
+        public uint EncryptedSize;
+    }
+
+    [Serializable]
+    public class PkgScheme : ResourceScheme
+    {
+        public IDictionary<string, uint[]>  KnownKeys;
+    }
+}