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2017-01-25 09:47:04 +04:00
//! \file ArcTAC.cs
//! \date Wed Jan 25 04:41:35 2017
//! \brief TanukiSoft resource archive.
//
// 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.Text;
using GameRes.Compression;
using GameRes.Cryptography;
namespace GameRes.Formats.Tanuki
{
[Export(typeof(ArchiveFormat))]
public class TacOpener : ArchiveFormat
{
public override string Tag { get { return "TAC"; } }
public override string Description { get { return "TanukiSoft resource archive"; } }
public override uint Signature { get { return 0x63724154; } } // 'TArc'
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
static readonly byte[] IndexKey = Encoding.ASCII.GetBytes ("TLibArchiveData");
public override ArcFile TryOpen (ArcView file)
{
int version;
if (file.View.AsciiEqual (4, "1.00"))
version = 100;
else if (file.View.AsciiEqual (4, "1.10"))
version = 110;
else
return null;
int count = file.View.ReadInt32 (0x14);
if (!IsSaneCount (count))
return null;
int bucket_count = file.View.ReadInt32 (0x18);
uint index_size = file.View.ReadUInt32 (0x1C);
long index_offset = version >= 110 ? 0x2C : 0x24;
long base_offset = index_offset + index_size;
var blowfish = new Blowfish (IndexKey);
var packed_bytes = file.View.ReadBytes (index_offset, index_size);
blowfish.Decipher (packed_bytes, packed_bytes.Length & ~7);
using (var input = new MemoryStream (packed_bytes))
using (var unpacked = new ZLibStream (input, CompressionMode.Decompress))
using (var index = new BinaryReader (unpacked))
{
var dir_table = new List<TacBucket> (bucket_count);
for (int i = 0; i < bucket_count; ++i)
{
var entry = new TacBucket();
entry.Hash = index.ReadUInt16();
entry.Count = index.ReadUInt16();
entry.Index = index.ReadInt32();
dir_table.Add (entry);
}
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
var entry = new TacEntry();
entry.Hash = index.ReadUInt64();
entry.IsPacked = index.ReadInt32() != 0;
entry.UnpackedSize = index.ReadUInt32();
entry.Offset = base_offset + index.ReadUInt32();
entry.Size = index.ReadUInt32();
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
}
var buffer = new byte[8];
foreach (var bucket in dir_table)
{
for (int i = 0; i < bucket.Count; ++i)
{
var entry = dir[bucket.Index+i] as TacEntry;
entry.Hash = entry.Hash << 16 | bucket.Hash;
entry.Name = string.Format ("{0:X16}", entry.Hash);
if (entry.IsPacked)
continue;
entry.Key = Encoding.ASCII.GetBytes (string.Format ("{0}_tlib_secure_", entry.Hash));
var bf = new Blowfish (entry.Key);
file.View.Read (entry.Offset, buffer, 0, 8);
bf.Decipher (buffer, 8);
var res = AutoEntry.DetectFileType (buffer.ToUInt32 (0));
if (res != null)
entry.ChangeType (res);
if ("image" == entry.Type)
entry.EncryptedSize = Math.Min (10240, entry.Size);
else
entry.EncryptedSize = entry.Size;
}
}
return new ArcFile (file, this, dir);
}
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var tent = entry as TacEntry;
if (null == tent)
return base.OpenEntry (arc, entry);
if (tent.IsPacked)
{
var input = arc.File.CreateStream (entry.Offset, entry.Size);
return new ZLibStream (input, CompressionMode.Decompress);
}
var bf = new Blowfish (tent.Key);
if (tent.EncryptedSize < tent.Size)
{
var header = arc.File.View.ReadBytes (tent.Offset, tent.EncryptedSize);
bf.Decipher (header, header.Length);
var rest = arc.File.CreateStream (tent.Offset+tent.EncryptedSize, tent.Size-tent.EncryptedSize);
return new PrefixStream (header, rest);
}
else if (0 == (tent.Size & 7))
{
var input = arc.File.CreateStream (tent.Offset, tent.Size);
return new InputCryptoStream (input, bf.CreateDecryptor());
}
else
{
var data = arc.File.View.ReadBytes (tent.Offset, tent.Size);
bf.Decipher (data, data.Length & ~7);
return new BinMemoryStream (data);
}
}
}
internal class TacEntry : PackedEntry
{
public ulong Hash;
public byte[] Key;
public uint EncryptedSize;
}
internal class TacBucket
{
public ushort Hash;
public int Count;
public int Index;
}
}