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(FC01): implemented AGSI archives.
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morkt
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5468ef58f7
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a8e7249a10
196
ArcFormats/FC01/ArcPAK.cs
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196
ArcFormats/FC01/ArcPAK.cs
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//! \file ArcPAK.cs
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//! \date 2018 Feb 27
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//! \brief AGSI resource archive.
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//
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// Copyright (C) 2018 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.Security.Cryptography;
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using GameRes.Compression;
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using GameRes.Cryptography;
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using GameRes.Utility;
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// Advanced Game Script Interpreter
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namespace GameRes.Formats.FC01
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{
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internal class AgsiEntry : PackedEntry
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{
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public int Method;
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public bool IsEncrypted;
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public bool IsSpecial;
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}
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internal class AgsiArchive : ArcFile
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{
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public readonly byte[] Key;
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public AgsiArchive (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 PakOpener : ArchiveFormat
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{
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public override string Tag { get { return "PAK/AGSI"; } }
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public override string Description { get { return "AGSI engine resource archive"; } }
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public override uint Signature { get { return 0x24A02028; } }
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public override bool IsHierarchic { get { return false; } }
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public override bool CanWrite { get { return false; } }
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static readonly Dictionary<string, byte[]> KnownKeys = new Dictionary<string,byte[]> {
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{ "01.pak", new byte[] { 0x4A, 0xC9, 0x75, 0x62, 0x39, 0xC1, 0xBE, 0x54 } },
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{ "02.pak", new byte[] { 0xC9, 0x46, 0x32, 0x69, 0x7B, 0xD2, 0x58, 0x54 } },
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{ "03.pak", new byte[] { 0x33, 0x34, 0x37, 0x38, 0x73, 0x68, 0x61, 0x6F } }, // "3478shao"
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{ "04.pak", new byte[] { 0x73, 0x69, 0x6F, 0x62, 0x6E, 0x72, 0x61, 0x68 } }, // "siobnrah"
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{ "05.pak", new byte[] { 0xB5, 0x37, 0x70, 0x38, 0x3D, 0x62, 0x48, 0xD1 } },
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{ "06.pak", new byte[] { 0x4F, 0x7D, 0x40, 0x24, 0x57, 0xCD, 0x68, 0x6E } },
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};
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public override ArcFile TryOpen (ArcView file)
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{
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var header = file.View.ReadBytes (0, 12);
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byte k1 = file.View.ReadByte (file.MaxOffset-9);
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byte k2 = file.View.ReadByte (file.MaxOffset-6);
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DecryptHeader (header, k1, k2);
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if (!header.AsciiEqual ("PACK"))
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return null;
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int count = header.ToInt32 (4);
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int entry_size = header.ToInt32 (8);
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if (!IsSaneCount (count) || entry_size <= 0x10)
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return null;
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int index_size = count * entry_size;
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var index = file.View.ReadBytes (12, (uint)index_size);
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Decrypt (index, 0, index_size, 7524u);
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long data_offset = 12 + index_size;
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int index_offset = 0;
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int name_length = entry_size - 0x10;
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var dir = new List<Entry> (count);
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for (int i = 0; i < count; ++i)
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{
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var name = Binary.GetCString (index, index_offset+0x10, name_length);
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var entry = FormatCatalog.Instance.Create<AgsiEntry> (name);
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entry.UnpackedSize = index.ToUInt32 (index_offset);
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entry.Size = index.ToUInt32 (index_offset+4);
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entry.Method = index.ToInt32 (index_offset+8);
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entry.Offset = index.ToUInt32 (index_offset+0xC) + data_offset;
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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entry.IsPacked = entry.Method != 0;
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entry.IsEncrypted = entry.Method >= 3 && (entry.Method <= 5 || entry.Method == 7);
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entry.IsSpecial = name.Equals ("Copyright.Dat", StringComparison.OrdinalIgnoreCase);
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dir.Add (entry);
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index_offset += entry_size;
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}
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var arc_name = Path.GetFileName (file.Name).ToLowerInvariant();
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byte[] key;
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if (!KnownKeys.TryGetValue (arc_name, out key) || key == null)
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return new ArcFile (file, this, dir);
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return new AgsiArchive (file, this, dir, key);
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}
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public override Stream OpenEntry (ArcFile arc, Entry entry)
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{
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var aent = entry as AgsiEntry;
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if (null == aent || 0 == aent.Method)
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return base.OpenEntry (arc, entry);
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var aarc = arc as AgsiArchive;
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Stream input;
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if (aent.IsEncrypted && aarc != null && aarc.Key != null)
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{
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uint enc_size = entry.Size;
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if (enc_size > 1024)
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{
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enc_size = 1032;
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}
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using (var des = DES.Create())
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{
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des.Key = aarc.Key;
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des.Mode = CipherMode.ECB;
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des.Padding = PaddingMode.Zeros;
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using (var enc = arc.File.CreateStream (entry.Offset, enc_size))
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using (var dec = new InputCryptoStream (enc, des.CreateDecryptor()))
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{
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var output = new byte[enc_size];
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dec.Read (output, 0, output.Length);
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int header_size;
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if (!aent.IsSpecial)
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header_size = output.ToInt32 (output.Length-4);
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else
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header_size = (int)aent.UnpackedSize;
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if (!aent.IsSpecial && entry.Size > enc_size)
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{
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var header = new byte[header_size];
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Buffer.BlockCopy (output, 0, header, 0, header_size);
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input = arc.File.CreateStream (entry.Offset + enc_size, entry.Size - enc_size);
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input = new PrefixStream (header, input);
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}
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else
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input = new BinMemoryStream (output, 0, header_size, entry.Name);
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}
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}
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}
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else
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input = arc.File.CreateStream (entry.Offset, entry.Size);
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switch (aent.Method)
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{
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case 6:
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case 7:
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input = new LzssStream (input);
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break;
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}
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return input;
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}
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void DecryptHeader (byte[] header, byte k1, byte k2)
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{
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int shift = k2 & 7;
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if (0 == shift)
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shift = 1;
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for (int i = 0; i < header.Length; ++i)
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{
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byte x = Binary.RotByteL (header[i], shift);
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header[i] = (byte)(x ^ k1++);
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}
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}
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void Decrypt (byte[] data, int pos, int length, uint seed)
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{
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var rnd = new MersenneTwister (seed);
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for (int i = 0; i < length; ++i)
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{
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uint key = rnd.Rand();
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int shift = (int)key & 7;
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if (0 == shift)
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shift = 1;
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byte x = Binary.RotByteL (data[pos+i], shift);
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data[pos+i] = (byte)(key ^ x);
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}
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}
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}
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}
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