mirror of
https://github.com/crskycode/GARbro.git
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437 lines
15 KiB
C#
437 lines
15 KiB
C#
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//! \file ArcDX.cs
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//! \date Thu Oct 08 00:18:56 2015
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//! \brief Encrypted Flatz archives with 'DX' signature.
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//
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// Copyright (C) 2015 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 GameRes.Utility;
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namespace GameRes.Formats.Flat
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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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[Export(typeof(ArchiveFormat))]
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public class DatOpener : ArchiveFormat
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{
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public override string Tag { get { return "DAT/FLAT"; } }
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public override string Description { get { return "Flat DX 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 DatOpener ()
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{
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Signatures = new uint[] { 0x19EF8ED4 }; // the only recognized encryption scheme
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}
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static readonly string[] KnownKeys = new string[]
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{
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"omanco", // Cross Quartz
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};
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public override ArcFile TryOpen (ArcView file)
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{
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int signature = file.View.ReadUInt16 (0);
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int version = file.View.ReadUInt16 (2);
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var key = new byte[12];
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foreach (var key_str in KnownKeys)
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{
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GetKeyBytes (key_str, key);
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int xor_id = key[0] | (key[1] << 8);
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int xor_ver = key[2] | (key[3] << 8);
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if ((signature ^ xor_id) != 0x5844) // 'DX'
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continue;
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xor_ver ^= version;
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if (xor_ver < 1 || xor_ver > 4)
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continue;
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var dir = ReadIndex (file, xor_ver, key);
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if (null != dir)
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return new DxArchive (file, this, dir, key);
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break;
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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 = new byte[0x18];
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if (0x18 != file.View.Read (4, header, 0, 0x18))
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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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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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private static void GetKeyBytes (string key, byte[] dst)
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{
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int key_length = Math.Min (dst.Length, key.Length);
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key_length = Encodings.cp932.GetBytes (key, 0, key_length, dst, 0);
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int j = 0;
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for (int i = key_length; i < dst.Length; ++i)
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{
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dst[i] = dst[j++];
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}
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dst[0] = (byte)~dst[0];
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dst[1] = (byte)((dst[1] >> 4) | (dst[1] << 4));
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dst[2] = (byte)(dst[2] ^ 0x8A);
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dst[3] = (byte)(~((dst[3] >> 4) | (dst[3] << 4)));
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dst[4] = (byte)~dst[4];
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dst[5] = (byte)(dst[5] ^ 0xAC);
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dst[6] = (byte)~dst[6];
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dst[7] = (byte)(~((dst[7] >> 3) | (dst[7] << 5)));
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dst[8] = (byte)((dst[8] >> 5) | (dst[8] << 3));
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dst[9] = (byte)(dst[9] ^ 0x7F);
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dst[10] = (byte)(((dst[10] >> 4) | (dst[10] << 4)) ^ 0xD6);
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dst[11] = (byte)(dst[11] ^ 0xCC);
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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 = 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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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> (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 : Stream
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{
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private Stream m_stream;
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private int m_base_pos;
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private byte[] m_key;
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private bool m_should_dispose;
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public Stream BaseStream { get { return m_stream; } }
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public override bool CanRead { get { return m_stream.CanRead; } }
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public override bool CanSeek { get { return m_stream.CanSeek; } }
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public override bool CanWrite { get { return m_stream.CanWrite; } }
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public override long Length { get { return m_stream.Length; } }
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public override long Position
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{
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get { return m_stream.Position; }
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set { m_stream.Position = value; }
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}
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public EncryptedStream (Stream input, long base_position, byte[] key)
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{
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m_stream = input;
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m_key = key;
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m_base_pos = (int)(base_position % m_key.Length);
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m_should_dispose = true;
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}
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#region System.IO.Stream methods
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public override void Flush()
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{
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m_stream.Flush();
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}
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public override long Seek (long offset, SeekOrigin origin)
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{
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return m_stream.Seek (offset, origin);
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}
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public override void SetLength (long length)
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{
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m_stream.SetLength (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;
|
||
|
|
int read = m_stream.Read (buffer, offset, count);
|
||
|
|
if (read > 0)
|
||
|
|
DatOpener.Decrypt (buffer, offset, count, key_pos, m_key);
|
||
|
|
return read;
|
||
|
|
}
|
||
|
|
|
||
|
|
public override int ReadByte ()
|
||
|
|
{
|
||
|
|
int key_pos = (int)((m_base_pos + Position) % m_key.Length);
|
||
|
|
int b = m_stream.ReadByte();
|
||
|
|
if (-1 != b)
|
||
|
|
{
|
||
|
|
b ^= m_key[key_pos];
|
||
|
|
}
|
||
|
|
return b;
|
||
|
|
}
|
||
|
|
|
||
|
|
public override void Write (byte[] buffer, int offset, int count)
|
||
|
|
{
|
||
|
|
int key_pos = (int)((m_base_pos + Position) % m_key.Length);
|
||
|
|
byte[] write_buf = new byte[count];
|
||
|
|
for (int i = 0; i < count; ++i)
|
||
|
|
{
|
||
|
|
write_buf[i] = (byte)(buffer[offset+i] ^ m_key[key_pos++]);
|
||
|
|
if (m_key.Length == key_pos)
|
||
|
|
key_pos = 0;
|
||
|
|
}
|
||
|
|
m_stream.Write (write_buf, 0, count);
|
||
|
|
}
|
||
|
|
|
||
|
|
public override void WriteByte (byte value)
|
||
|
|
{
|
||
|
|
int key_pos = (int)((m_base_pos + Position) % m_key.Length);
|
||
|
|
m_stream.WriteByte ((byte)(value ^ m_key[key_pos]));
|
||
|
|
}
|
||
|
|
#endregion
|
||
|
|
|
||
|
|
#region IDisposable Members
|
||
|
|
bool disposed = false;
|
||
|
|
protected override void Dispose (bool disposing)
|
||
|
|
{
|
||
|
|
if (!disposed)
|
||
|
|
{
|
||
|
|
if (disposing && m_should_dispose)
|
||
|
|
{
|
||
|
|
m_stream.Dispose();
|
||
|
|
}
|
||
|
|
disposed = true;
|
||
|
|
base.Dispose (disposing);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
#endregion
|
||
|
|
}
|
||
|
|
}
|