diff --git a/ArcFormats/Actgs/ArcCG.cs b/ArcFormats/Actgs/ArcCG.cs new file mode 100644 index 00000000..3b5834c7 --- /dev/null +++ b/ArcFormats/Actgs/ArcCG.cs @@ -0,0 +1,79 @@ +//! \file ArcCG.cs +//! \date 2018 Jan 09 +//! \brief ACTGS engine encrypted 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.Linq; + +namespace GameRes.Formats.Actgs +{ + [Export(typeof(ArchiveFormat))] + public class CgOpener : DatOpener + { + public override string Tag { get { return "CG/ACTGS"; } } + public override string Description { get { return "ACTGS engine 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) + { + var key = FindKey (file); + if (null == key) + return null; + uint signature_key = key.ToUInt32 (0); + int count = (int)(file.View.ReadUInt32 (0) ^ signature_key); + if (!IsSaneCount (count)) + return null; + uint index_size = 32 * (uint)count; + using (var enc = file.CreateStream (0x10, index_size)) + using (var input = new ByteStringEncryptedStream (enc, key)) + using (var index = new BinaryStream (input, file.Name)) + { + var reader = new IndexReader (file.MaxOffset); + var dir = reader.Read (index, count); + if (null == dir) + return null; + return new ActressArchive (file, this, dir, key); + } + } + + byte[] FindKey (ArcView file) + { + var pattern = file.View.ReadBytes (4, 8); + return Array.Find (KnownKeys, k => KeySequence (k).Skip (4).Take (8).SequenceEqual (pattern)); + } + + internal static IEnumerable KeySequence (byte[] key) + { + for (;;) + { + for (int i = 0; i < key.Length; ++i) + yield return key[i]; + } + } + } +} diff --git a/ArcFormats/Actgs/ArcDAT.cs b/ArcFormats/Actgs/ArcDAT.cs index 7ae1f8f7..80ea7c03 100644 --- a/ArcFormats/Actgs/ArcDAT.cs +++ b/ArcFormats/Actgs/ArcDAT.cs @@ -64,7 +64,7 @@ namespace GameRes.Formats.Actgs Extensions = new string[] { "dat" }; } - public static byte[][] KnownKeys = { }; + internal static byte[][] KnownKeys = { }; public override ArcFile TryOpen (ArcView file) { @@ -74,40 +74,34 @@ namespace GameRes.Formats.Actgs if (0 != (file.View.ReadInt32 (4) | file.View.ReadInt32 (8) | file.View.ReadInt32 (12))) return null; const int entry_size = 0x20; - var index = new byte[count * entry_size]; - if (index.Length != file.View.Read (0x10, index, 0, (uint)index.Length)) - return null; - - uint first_offset = 0x10u + (uint)index.Length; - uint actual_offset = LittleEndian.ToUInt32 (index, 0); - byte[] key = null; - if (actual_offset != first_offset) + uint index_length = (uint)(count * entry_size); + IBinaryStream input = file.CreateStream (0x10, index_length); + try { - key = FindKey (first_offset, actual_offset); + uint first_offset = 0x10u + index_length; + uint actual_offset = input.Signature; + byte[] key = null; + if (actual_offset != first_offset) + { + key = FindKey (first_offset, actual_offset); + if (null == key) + return null; + var decrypted = new ByteStringEncryptedStream (input.AsStream, key); + input = new BinaryStream (decrypted, file.Name); + } + var reader = new IndexReader (file.MaxOffset); + var dir = reader.Read (input, count); + if (null == dir) + return null; if (null == key) - return null; - Decrypt (index, 0, index.Length, key); + return new ArcFile (file, this, dir); + else + return new ActressArchive (file, this, dir, key); } - - int index_offset = 0; - var dir = new List (count); - for (int i = 0; i < count; ++i) + finally { - var name = Binary.GetCString (index, index_offset+8, 0x18); - if (0 == name.Length) - return null; - var entry = FormatCatalog.Instance.Create (name); - entry.Offset = LittleEndian.ToUInt32 (index, index_offset); - entry.Size = LittleEndian.ToUInt32 (index, index_offset+4); - if (!entry.CheckPlacement (file.MaxOffset)) - return null; - dir.Add (entry); - index_offset += 0x20; + input.Dispose(); } - if (null == key) - return new ArcFile (file, this, dir); - else - return new ActressArchive (file, this, dir, key); } public override Stream OpenEntry (ArcFile arc, Entry entry) @@ -148,7 +142,7 @@ namespace GameRes.Formats.Actgs return Array.Find (KnownKeys, k => k.Take (4).SequenceEqual (pattern)); } - static void Decrypt (byte[] data, int index, int length, byte[] key) + internal static void Decrypt (byte[] data, int index, int length, byte[] key) { for (int i = 0; i < length; ++i) { @@ -162,4 +156,42 @@ namespace GameRes.Formats.Actgs set { KnownKeys = ((ActressScheme)value).KnownKeys; } } } + + internal sealed class IndexReader + { + long m_arc_length; + List m_dir = new List(); + + public IndexReader (long arc_length) + { + m_arc_length = arc_length; + } + + public List Read (IBinaryStream input, int count) + { + m_dir.Clear(); + if (m_dir.Capacity < count) + m_dir.Capacity = count; + try + { + for (int i = 0; i < count; ++i) + { + uint offset = input.ReadUInt32(); + uint size = input.ReadUInt32(); + var name = input.ReadCString (0x18); + var entry = FormatCatalog.Instance.Create (name); + entry.Offset = offset; + entry.Size = size; + if (!entry.CheckPlacement (m_arc_length)) + return null; + m_dir.Add (entry); + } + return m_dir; + } + catch + { + return null; + } + } + } } diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj index d98775fc..e3c1ef5f 100644 --- a/ArcFormats/ArcFormats.csproj +++ b/ArcFormats/ArcFormats.csproj @@ -78,6 +78,7 @@ +