mirror of
https://github.com/crskycode/GARbro.git
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454 lines
16 KiB
C#
454 lines
16 KiB
C#
//! \file ArcDX.cs
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//! \date Thu Oct 08 00:18:56 2015
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//! \brief DxLib engine archives with 'DX' signature.
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//
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// Copyright (C) 2015-2016 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.IO;
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using System.Linq;
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using GameRes.Utility;
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namespace GameRes.Formats.DxLib
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{
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internal class DxArchive : ArcFile
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{
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public readonly byte[] Key;
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public DxArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, byte[] key)
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: base (arc, impl, dir)
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{
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Key = key;
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}
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}
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[Serializable]
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public class DxScheme : ResourceScheme
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{
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public IList<byte[]> KnownKeys;
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}
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[Export(typeof(ArchiveFormat))]
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public class DxOpener : ArchiveFormat
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{
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public override string Tag { get { return "DXA"; } }
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public override string Description { get { return "DxLib engine resource archive"; } }
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public override uint Signature { get { return 0; } }
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public override bool IsHierarchic { get { return true; } }
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public override bool CanCreate { get { return false; } }
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public DxOpener ()
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{
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Extensions = new string[] { "dxa", "hud", "usi", "med", "dat" };
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Signatures = new uint[] { 0x19EF8ED4, 0xA9FCCEDD, 0x0AEE0FD3, 0x5523F211, 0x5524F211, 0 };
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}
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public static IList<byte[]> KnownKeys = new List<byte[]>();
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public override ArcFile TryOpen (ArcView file)
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{
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if (file.MaxOffset < 0x1C)
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return null;
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uint signature = file.View.ReadUInt32 (0);
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foreach (var key in KnownKeys)
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{
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uint sig_key = LittleEndian.ToUInt32 (key, 0);
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uint sig_test = signature ^ sig_key;
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int version = (int)(sig_test >> 16);
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if (0x5844 == (sig_test & 0xFFFF) && version <= 4) // 'DX'
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{
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var dir = ReadIndex (file, version, key);
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if (null != dir)
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{
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if (KnownKeys[0] != key)
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{
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// move last used key to the top of the known keys list
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KnownKeys.Remove (key);
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KnownKeys.Insert (0, key);
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}
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return new DxArchive (file, this, dir, key);
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}
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return null;
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}
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}
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return GuessKey (file);
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}
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ArcFile GuessKey (ArcView file)
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{
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if (file.MaxOffset > uint.MaxValue)
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return null;
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var key = new byte[12];
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for (short version = 4; version >= 1; --version)
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{
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file.View.Read (0, key, 0, 12);
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key[0] ^= (byte)'D';
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key[1] ^= (byte)'X';
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key[2] ^= (byte)version;
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int base_offset = version > 3 ? 0x1C : 0x18;
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key[8] ^= (byte)base_offset;
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uint key0 = LittleEndian.ToUInt32 (key, 0);
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uint index_offset = file.View.ReadUInt32 (12) ^ key0;
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if (index_offset <= base_offset || index_offset >= file.MaxOffset)
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continue;
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uint index_size = (uint)(file.MaxOffset - index_offset);
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if (index_size > 0xFFFFFF)
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continue;
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key[4] ^= (byte)index_size;
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key[5] ^= (byte)(index_size >> 8);
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key[6] ^= (byte)(index_size >> 16);
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try
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{
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var dir = ReadIndex (file, version, key);
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if (null != dir)
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{
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KnownKeys.Insert (0, key);
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return new DxArchive (file, this, dir, key);
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}
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}
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catch { /* ignore parse errors */ }
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}
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return null;
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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Stream input = arc.File.CreateStream (entry.Offset, entry.Size);
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var dx_arc = arc as DxArchive;
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if (null == dx_arc)
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return input;
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input = new EncryptedStream (input, entry.Offset, dx_arc.Key);
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var dx_ent = entry as PackedEntry;
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if (null == dx_ent || !dx_ent.IsPacked)
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return input;
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using (input)
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{
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var data = Unpack (input);
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return new MemoryStream (data);
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}
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}
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byte[] Unpack (Stream stream)
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{
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using (var input = new ArcView.Reader (stream))
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{
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uint unpacked_size = input.ReadUInt32();
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int remaining = input.ReadInt32() - 9;
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var output = new byte[unpacked_size];
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byte control_code = input.ReadByte();
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int dst = 0;
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while (remaining > 0)
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{
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byte b = input.ReadByte();
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--remaining;
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if (b != control_code)
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{
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output[dst++] = b;
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continue;
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}
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b = input.ReadByte();
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--remaining;
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if (b == control_code)
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{
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output[dst++] = b;
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continue;
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}
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if (b > control_code)
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--b;
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int count = b >> 3;
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if (0 != (b & 4))
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{
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count |= input.ReadByte() << 5;
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--remaining;
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}
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count += 4;
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int offset;
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switch (b & 3)
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{
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case 0:
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offset = input.ReadByte();
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--remaining;
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break;
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case 1:
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offset = input.ReadUInt16();
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remaining -= 2;
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break;
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case 2:
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offset = input.ReadUInt16();
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offset |= input.ReadByte() << 16;
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remaining -= 3;
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break;
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default:
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throw new InvalidFormatException ("DX decompression failed");
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}
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++offset;
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Binary.CopyOverlapped (output, dst - offset, dst, count);
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dst += count;
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}
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return output;
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}
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}
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List<Entry> ReadIndex (ArcView file, int version, byte[] key)
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{
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var header = file.View.ReadBytes (4, 0x18);
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if (0x18 != header.Length)
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return null;
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Decrypt (header, 0, header.Length, 4, key);
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var dx = new DxHeader {
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IndexSize = LittleEndian.ToUInt32 (header, 0),
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BaseOffset = LittleEndian.ToUInt32 (header, 4),
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IndexOffset = LittleEndian.ToUInt32 (header, 8),
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FileTable = LittleEndian.ToUInt32 (header, 0x0c),
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DirTable = LittleEndian.ToUInt32 (header, 0x10),
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};
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if (dx.DirTable >= dx.IndexSize || dx.FileTable >= dx.IndexSize)
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return null;
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using (var encrypted = file.CreateStream (dx.IndexOffset, dx.IndexSize))
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using (var index = new EncryptedStream (encrypted, dx.IndexOffset, key))
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using (var reader = new IndexReader (dx, version, index))
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{
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return reader.Read();
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}
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}
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internal static void Decrypt (byte[] data, int index, int count, long offset, byte[] key)
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{
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int key_pos = (int)(offset % key.Length);
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for (int i = 0; i < count; ++i)
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{
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data[index+i] ^= key[key_pos++];
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if (key.Length == key_pos)
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key_pos = 0;
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}
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}
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public static byte[] CreateKey (string keyword)
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{
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byte[] key;
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if (string.IsNullOrEmpty (keyword))
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{
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key = Enumerable.Repeat<byte> (0xAA, 12).ToArray();
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}
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else
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{
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key = new byte[12];
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int char_count = Math.Min (keyword.Length, 12);
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int length = Encodings.cp932.GetBytes (keyword, 0, char_count, key, 0);
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if (length < 12)
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Binary.CopyOverlapped (key, 0, length, 12-length);
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}
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key[0] ^= 0xFF;
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key[1] = Binary.RotByteR (key[1], 4);
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key[2] ^= 0x8A;
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key[3] = (byte)~Binary.RotByteR (key[3], 4);
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key[4] ^= 0xFF;
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key[5] ^= 0xAC;
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key[6] ^= 0xFF;
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key[7] = (byte)~Binary.RotByteR (key[7], 3);
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key[8] = Binary.RotByteL (key[8], 3);
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key[9] ^= 0x7F;
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key[10] = (byte)(Binary.RotByteR (key[10], 4) ^ 0xD6);
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key[11] ^= 0xCC;
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return key;
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}
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public override ResourceScheme Scheme
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{
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get { return new DxScheme { KnownKeys = KnownKeys }; }
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set { KnownKeys = ((DxScheme)value).KnownKeys; }
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}
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}
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internal class DxHeader
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{
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public long BaseOffset;
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public long IndexOffset;
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public uint IndexSize;
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public uint FileTable;
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public uint DirTable;
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}
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internal class DxDirectory
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{
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public int DirOffset;
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public int ParentDirOffset;
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public int FileCount;
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public int FileTable;
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}
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internal sealed class IndexReader : IDisposable
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{
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readonly int m_version;
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readonly int m_entry_size;
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DxHeader m_header;
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BinaryReader m_input;
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List<Entry> m_dir = new List<Entry>();
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public List<Entry> Dir { get { return m_dir; } }
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public IndexReader (DxHeader header, int version, Stream input)
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{
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m_version = version;
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m_entry_size = m_version >= 2 ? 0x2C : 0x28;
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m_header = header;
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m_input = new ArcView.Reader (input);
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}
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public List<Entry> Read ()
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{
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ReadFileTable ("", 0);
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return m_dir;
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}
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DxDirectory ReadDirEntry ()
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{
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var dir = new DxDirectory();
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dir.DirOffset = m_input.ReadInt32();
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dir.ParentDirOffset = m_input.ReadInt32();
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dir.FileCount = m_input.ReadInt32();
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dir.FileTable = m_input.ReadInt32();
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return dir;
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}
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void ReadFileTable (string root, uint table_offset)
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{
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m_input.BaseStream.Position = m_header.DirTable + table_offset;
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var dir = ReadDirEntry();
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if (dir.DirOffset != -1 && dir.ParentDirOffset != -1)
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{
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m_input.BaseStream.Position = m_header.FileTable + dir.DirOffset;
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root = Path.Combine (root, ExtractFileName (m_input.ReadUInt32()));
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}
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long current_pos = m_header.FileTable + dir.FileTable;
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for (int i = 0; i < dir.FileCount; ++i)
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{
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m_input.BaseStream.Position = current_pos;
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uint name_offset = m_input.ReadUInt32();
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uint attr = m_input.ReadUInt32();
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m_input.BaseStream.Seek (0x18, SeekOrigin.Current);
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uint offset = m_input.ReadUInt32();
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if (0 != (attr & 0x10)) // FILE_ATTRIBUTE_DIRECTORY
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{
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if (0 == offset || table_offset == offset)
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throw new InvalidFormatException ("Infinite recursion in DXA directory index");
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ReadFileTable (root, offset);
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}
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else
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{
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uint size = m_input.ReadUInt32();
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int packed_size = -1;
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if (m_version >= 2)
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packed_size = m_input.ReadInt32();
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var entry = FormatCatalog.Instance.Create<PackedEntry> (Path.Combine (root, ExtractFileName (name_offset)));
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entry.Offset = m_header.BaseOffset + offset;
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entry.UnpackedSize = size;
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entry.IsPacked = -1 != packed_size;
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if (entry.IsPacked)
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entry.Size = (uint)packed_size;
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else
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entry.Size = size;
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m_dir.Add (entry);
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}
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current_pos += m_entry_size;
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}
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}
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string ExtractFileName (uint table_offset)
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{
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m_input.BaseStream.Position = table_offset;
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int name_offset = m_input.ReadUInt16() * 4 + 4;
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m_input.BaseStream.Position = table_offset + name_offset;
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return m_input.BaseStream.ReadCString();
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}
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#region IDisposable Members
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bool disposed = false;
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public void Dispose ()
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{
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if (!disposed)
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{
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m_input.Dispose();
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disposed = true;
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}
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}
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#endregion
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}
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internal class EncryptedStream : ProxyStream
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{
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private int m_base_pos;
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private byte[] m_key;
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public EncryptedStream (Stream stream, long base_position, byte[] key, bool leave_open = false)
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: base (stream, leave_open)
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{
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m_key = key;
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m_base_pos = (int)(base_position % m_key.Length);
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}
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public override int Read (byte[] buffer, int offset, int count)
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{
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var key_pos = m_base_pos + Position;
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int read = BaseStream.Read (buffer, offset, count);
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if (read > 0)
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DxOpener.Decrypt (buffer, offset, count, key_pos, m_key);
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return read;
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}
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public override int ReadByte ()
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{
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int key_pos = (int)((m_base_pos + Position) % m_key.Length);
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int b = BaseStream.ReadByte();
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if (-1 != b)
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{
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b ^= m_key[key_pos];
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}
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return b;
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}
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public override void Write (byte[] buffer, int offset, int count)
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{
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int key_pos = (int)((m_base_pos + Position) % m_key.Length);
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byte[] write_buf = new byte[count];
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for (int i = 0; i < count; ++i)
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{
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write_buf[i] = (byte)(buffer[offset+i] ^ m_key[key_pos++]);
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if (m_key.Length == key_pos)
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key_pos = 0;
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}
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BaseStream.Write (write_buf, 0, count);
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}
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public override void WriteByte (byte value)
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{
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int key_pos = (int)((m_base_pos + Position) % m_key.Length);
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BaseStream.WriteByte ((byte)(value ^ m_key[key_pos]));
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}
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}
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}
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