mirror of
https://github.com/crskycode/GARbro.git
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241 lines
9.4 KiB
C#
241 lines
9.4 KiB
C#
//! \file ArcWAG.cs
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//! \date Tue Aug 11 08:28:28 2015
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//! \brief Xuse/Eternal resource archive.
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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 System.Text.RegularExpressions;
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using GameRes.Utility;
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namespace GameRes.Formats.Xuse
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{
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internal class WagArchive : ArcFile
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{
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public readonly byte[] Key;
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public WagArchive (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 WagOpener : ArchiveFormat
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{
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public override string Tag { get { return "WAG"; } }
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public override string Description { get { return "Xuse/Eternal resource archive"; } }
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public override uint Signature { get { return 0x40474157; } } // 'WAG@'
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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 WagOpener ()
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{
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Extensions = new string[] { "wag", "4ag" };
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Signatures = new uint[] { 0x40474157, 0x34464147 }; // 'GAF4'
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}
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public override ArcFile TryOpen (ArcView file)
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{
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if (0x0300 != file.View.ReadUInt16 (4))
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return null;
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int count = file.View.ReadInt32 (0x46);
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if (!IsSaneCount (count))
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return null;
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byte[] title = new byte[0x40];
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if (0x40 != file.View.Read (6, title, 0, 0x40))
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return null;
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int title_length = Array.IndexOf<byte> (title, 0);
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if (-1 == title_length)
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title_length = title.Length;
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string arc_filename = Path.GetFileName (file.Name).ToLowerInvariant();
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byte[] bin_filename = Encodings.cp932.GetBytes (arc_filename);
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byte[] name_key = GenerateKey (bin_filename);
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uint key_sum = (uint)name_key.Select (x => (int)x).Sum();
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uint index_offset = 0x200 + key_sum;
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for (int i = 0; i < name_key.Length; ++i)
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{
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index_offset ^= name_key[i];
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index_offset = Binary.RotR (index_offset, 1);
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}
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for (int i = 0; i < name_key.Length; ++i)
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{
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index_offset ^= name_key[i];
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index_offset = Binary.RotR (index_offset, 1);
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}
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index_offset %= 0x401;
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index_offset += 0x4A;
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byte[] index = file.View.ReadBytes (index_offset, (uint)(4*count));
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if (index.Length != 4*count)
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return null;
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byte[] index_key = new byte[index.Length];
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for (int i = 0; i < index_key.Length; ++i)
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{
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int v = name_key[(i+1) % name_key.Length] ^ (name_key[i % name_key.Length] + (i & 0xFF));
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index_key[i] = (byte)(count + v);
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}
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Decrypt (index_offset, index_key, index);
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var dir = new List<Entry> (count);
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int current_offset = 0;
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uint next_offset = LittleEndian.ToUInt32 (index, current_offset);
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byte[] data_key = GenerateKey (title, 0, title_length);
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string base_filename = Path.GetFileNameWithoutExtension (arc_filename);
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byte[] chunk_buf = new byte[8];
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byte[] filename_buf = new byte[0x40];
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for (int i = 0; i < count; ++i)
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{
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current_offset += 4;
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uint entry_offset = next_offset;
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if (entry_offset >= file.MaxOffset)
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return null;
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if (i + 1 == count)
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next_offset = (uint)file.MaxOffset;
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else
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next_offset = LittleEndian.ToUInt32 (index, current_offset);
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uint entry_size = next_offset - entry_offset;
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if (8 != file.View.Read (entry_offset, chunk_buf, 0, 8))
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return null;
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Decrypt (entry_offset, data_key, chunk_buf);
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if (!Binary.AsciiEqual (chunk_buf, "DSET"))
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return null;
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uint chunk_offset = entry_offset + 10;
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int chunk_count = LittleEndian.ToInt32 (chunk_buf, 4);
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string filename = null;
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string type = null;
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for (int chunk = 0; chunk < chunk_count; ++chunk)
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{
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if (8 != file.View.Read (chunk_offset, chunk_buf, 0, 8))
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return null;
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Decrypt (chunk_offset, data_key, chunk_buf);
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int chunk_size = LittleEndian.ToInt32 (chunk_buf, 4);
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if (chunk_size <= 0)
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return null;
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if (Binary.AsciiEqual (chunk_buf, "PICT"))
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{
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if (null == type)
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{
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type = "image";
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entry_offset = chunk_offset + 0x10;
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entry_size = (uint)chunk_size - 6;
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}
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}
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else if (null == filename && Binary.AsciiEqual (chunk_buf, "FTAG"))
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{
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if (chunk_size > filename_buf.Length)
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filename_buf = new byte[chunk_size];
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if (chunk_size != file.View.Read (chunk_offset+10, filename_buf, 0, (uint)chunk_size))
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return null;
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Decrypt (chunk_offset+10, data_key, filename_buf, 0, chunk_size-2);
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filename = Encodings.cp932.GetString (filename_buf, 0, chunk_size-2);
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}
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chunk_offset += 10 + (uint)chunk_size;
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}
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Entry entry;
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if (!string.IsNullOrEmpty (filename))
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{
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filename = DriveRe.Replace (filename, "");
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entry = FormatCatalog.Instance.Create<Entry> (filename);
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}
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else
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{
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entry = new Entry {
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Name = string.Format ("{0}#{1:D4}", base_filename, i),
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Type = type ?? ""
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};
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}
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entry.Offset = entry_offset;
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entry.Size = entry_size;
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dir.Add (entry);
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}
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return new WagArchive (file, this, dir, data_key);
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}
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static readonly Regex DriveRe = new Regex (@"^(?:.+:)?\\+");
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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var warc = arc as WagArchive;
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if (null == warc)
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return arc.File.CreateStream (entry.Offset, entry.Size);
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var data = new byte[entry.Size];
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arc.File.View.Read (entry.Offset, data, 0, entry.Size);
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Decrypt ((uint)entry.Offset, warc.Key, data);
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return new MemoryStream (data);
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}
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private byte[] GenerateKey (byte[] keyword)
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{
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return GenerateKey (keyword, 0, keyword.Length);
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}
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private byte[] GenerateKey (byte[] keyword, int index, int length)
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{
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int hash = 0;
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for (int i = 0; i < length; ++i)
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hash = (((sbyte)keyword[i+index] + i) ^ hash) + length;
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int key_length = (hash & 0xFF) + 0x40;
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for (int i = 0; i < length; ++i)
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hash += (sbyte)keyword[i+index];
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byte[] key = new byte[key_length--];
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key[1] = (byte)(hash >> 8);
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hash &= 0xF;
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key[0] = (byte)hash;
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key[2] = 0x46;
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key[3] = 0x88;
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for (int i = 4; i < key_length; ++i)
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{
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hash += (((sbyte)keyword[i % length] ^ hash) + i) & 0xFF;
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key[i] = (byte)hash;
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}
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return key;
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}
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private void Decrypt (uint offset, byte[] key, byte[] index)
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{
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Decrypt (offset, key, index, 0, index.Length);
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}
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private void Decrypt (uint offset, byte[] key, byte[] index, int pos, int length)
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{
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uint key_last = (uint)key.Length-1;
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for (uint i = 0; i < length; ++i)
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index[pos+i] ^= key[(offset + i) % key_last];
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}
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}
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}
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