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implemented ecrypted ACTGS archives.
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morkt
parent
444a15b94a
commit
77459967fa
79
ArcFormats/Actgs/ArcCG.cs
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79
ArcFormats/Actgs/ArcCG.cs
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@ -0,0 +1,79 @@
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//! \file ArcCG.cs
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//! \date 2018 Jan 09
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//! \brief ACTGS engine encrypted archive.
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//
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// Copyright (C) 2018 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.Linq;
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namespace GameRes.Formats.Actgs
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{
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[Export(typeof(ArchiveFormat))]
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public class CgOpener : DatOpener
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{
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public override string Tag { get { return "CG/ACTGS"; } }
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public override string Description { get { return "ACTGS engine resource archive"; } }
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public override uint Signature { get { return 0; } }
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public override bool IsHierarchic { get { return false; } }
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public override bool CanWrite { get { return false; } }
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public override ArcFile TryOpen (ArcView file)
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{
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var key = FindKey (file);
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if (null == key)
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return null;
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uint signature_key = key.ToUInt32 (0);
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int count = (int)(file.View.ReadUInt32 (0) ^ signature_key);
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if (!IsSaneCount (count))
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return null;
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uint index_size = 32 * (uint)count;
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using (var enc = file.CreateStream (0x10, index_size))
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using (var input = new ByteStringEncryptedStream (enc, key))
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using (var index = new BinaryStream (input, file.Name))
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{
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var reader = new IndexReader (file.MaxOffset);
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var dir = reader.Read (index, count);
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if (null == dir)
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return null;
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return new ActressArchive (file, this, dir, key);
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}
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}
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byte[] FindKey (ArcView file)
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{
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var pattern = file.View.ReadBytes (4, 8);
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return Array.Find (KnownKeys, k => KeySequence (k).Skip (4).Take (8).SequenceEqual (pattern));
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}
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internal static IEnumerable<byte> KeySequence (byte[] key)
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{
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for (;;)
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{
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for (int i = 0; i < key.Length; ++i)
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yield return key[i];
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}
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}
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}
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}
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@ -64,7 +64,7 @@ namespace GameRes.Formats.Actgs
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Extensions = new string[] { "dat" };
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}
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public static byte[][] KnownKeys = { };
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internal static byte[][] KnownKeys = { };
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public override ArcFile TryOpen (ArcView file)
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{
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@ -74,40 +74,34 @@ namespace GameRes.Formats.Actgs
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if (0 != (file.View.ReadInt32 (4) | file.View.ReadInt32 (8) | file.View.ReadInt32 (12)))
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return null;
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const int entry_size = 0x20;
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var index = new byte[count * entry_size];
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if (index.Length != file.View.Read (0x10, index, 0, (uint)index.Length))
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return null;
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uint first_offset = 0x10u + (uint)index.Length;
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uint actual_offset = LittleEndian.ToUInt32 (index, 0);
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byte[] key = null;
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if (actual_offset != first_offset)
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uint index_length = (uint)(count * entry_size);
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IBinaryStream input = file.CreateStream (0x10, index_length);
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try
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{
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key = FindKey (first_offset, actual_offset);
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uint first_offset = 0x10u + index_length;
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uint actual_offset = input.Signature;
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byte[] key = null;
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if (actual_offset != first_offset)
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{
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key = FindKey (first_offset, actual_offset);
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if (null == key)
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return null;
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var decrypted = new ByteStringEncryptedStream (input.AsStream, key);
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input = new BinaryStream (decrypted, file.Name);
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}
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var reader = new IndexReader (file.MaxOffset);
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var dir = reader.Read (input, count);
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if (null == dir)
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return null;
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if (null == key)
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return null;
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Decrypt (index, 0, index.Length, key);
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return new ArcFile (file, this, dir);
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else
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return new ActressArchive (file, this, dir, key);
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}
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int index_offset = 0;
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var dir = new List<Entry> (count);
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for (int i = 0; i < count; ++i)
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finally
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{
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var name = Binary.GetCString (index, index_offset+8, 0x18);
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if (0 == name.Length)
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return null;
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var entry = FormatCatalog.Instance.Create<Entry> (name);
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entry.Offset = LittleEndian.ToUInt32 (index, index_offset);
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entry.Size = LittleEndian.ToUInt32 (index, index_offset+4);
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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dir.Add (entry);
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index_offset += 0x20;
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input.Dispose();
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}
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if (null == key)
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return new ArcFile (file, this, dir);
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else
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return new ActressArchive (file, this, dir, key);
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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@ -148,7 +142,7 @@ namespace GameRes.Formats.Actgs
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return Array.Find (KnownKeys, k => k.Take (4).SequenceEqual (pattern));
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}
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static void Decrypt (byte[] data, int index, int length, byte[] key)
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internal static void Decrypt (byte[] data, int index, int length, byte[] key)
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{
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for (int i = 0; i < length; ++i)
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{
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@ -162,4 +156,42 @@ namespace GameRes.Formats.Actgs
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set { KnownKeys = ((ActressScheme)value).KnownKeys; }
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}
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}
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internal sealed class IndexReader
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{
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long m_arc_length;
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List<Entry> m_dir = new List<Entry>();
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public IndexReader (long arc_length)
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{
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m_arc_length = arc_length;
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}
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public List<Entry> Read (IBinaryStream input, int count)
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{
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m_dir.Clear();
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if (m_dir.Capacity < count)
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m_dir.Capacity = count;
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try
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{
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for (int i = 0; i < count; ++i)
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{
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uint offset = input.ReadUInt32();
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uint size = input.ReadUInt32();
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var name = input.ReadCString (0x18);
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var entry = FormatCatalog.Instance.Create<Entry> (name);
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entry.Offset = offset;
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entry.Size = size;
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if (!entry.CheckPlacement (m_arc_length))
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return null;
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m_dir.Add (entry);
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}
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return m_dir;
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}
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catch
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{
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return null;
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}
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}
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}
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}
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@ -78,6 +78,7 @@
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<Compile Include="Abogado\ArcDSK.cs" />
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<Compile Include="Abogado\AudioADP.cs" />
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<Compile Include="Abogado\ImageKG.cs" />
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<Compile Include="Actgs\ArcCG.cs" />
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<Compile Include="Actgs\ArcDAT.cs" />
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<Compile Include="AdvSys\ArcAdvSys3.cs" />
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<Compile Include="AdvSys\ImageGWD.cs" />
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