mirror of
https://github.com/crskycode/GARbro.git
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484 lines
18 KiB
C#
484 lines
18 KiB
C#
//! \file ArcLPK.cs
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//! \date Mon Feb 16 17:21:47 2015
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//! \brief Lucifen Easy Game System archive implementation.
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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;
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using GameRes.Compression;
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using GameRes.Formats.Properties;
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using GameRes.Formats.Strings;
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using GameRes.Utility;
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namespace GameRes.Formats.Lucifen
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{
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internal class LuciEntry : PackedEntry
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{
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public byte Flag;
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}
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internal class LuciArchive : ArcFile
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{
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public LpkInfo Info;
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public EncryptionScheme Scheme;
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public LuciArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, EncryptionScheme scheme, LpkInfo info)
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: base (arc, impl, dir)
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{
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Info = info;
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Scheme = scheme;
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}
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}
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[Serializable]
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public class EncryptionScheme
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{
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public LpkOpener.Key BaseKey;
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public byte ContentXor;
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public uint RotatePattern;
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public bool ImportGameInit;
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}
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[Serializable]
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public class LpkScheme : ResourceScheme
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{
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public Dictionary<string, EncryptionScheme> KnownSchemes;
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public Dictionary<string, Dictionary<string, LpkOpener.Key>> KnownKeys;
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}
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internal class LuciOptions : ResourceOptions
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{
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public string Scheme;
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}
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internal class LpkInfo
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{
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public bool AlignedOffset;
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public bool Flag1;
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public bool IsEncrypted;
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public bool PackedEntries;
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public bool WholeCrypt;
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public uint Key;
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public byte[] Prefix;
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}
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[Export(typeof(ArchiveFormat))]
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public class LpkOpener : ArchiveFormat
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{
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public override string Tag { get { return "LPK"; } }
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public override string Description { get { return "Lucifen system resource archive"; } }
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public override uint Signature { get { return 0x314b504c; } } // 'LPK1'
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public override bool IsHierarchic { get { return true; } }
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public override bool CanWrite { get { return false; } }
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[Serializable]
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public class Key
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{
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public uint Key1, Key2;
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public Key (uint k1, uint k2)
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{
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Key1 = k1;
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Key2 = k2;
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}
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}
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static readonly EncryptionScheme DefaultScheme = new EncryptionScheme {
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BaseKey = new Key (0xA5B9AC6B, 0x9A639DE5), ContentXor = 0x5d, RotatePattern = 0x31746285,
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ImportGameInit = true
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};
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public static Dictionary<string, EncryptionScheme> KnownSchemes = new Dictionary<string, EncryptionScheme> { { "Default", DefaultScheme } };
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static Dictionary<string, Dictionary<string, Key>> KnownKeys = new Dictionary<string, Dictionary<string, Key>>();
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EncryptionScheme CurrentScheme = DefaultScheme;
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Dictionary<string, Key> CurrentFileMap = new Dictionary<string, Key>();
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public override ArcFile TryOpen (ArcView file)
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{
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string name = Path.GetFileName (file.Name).ToUpperInvariant();
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if (string.IsNullOrEmpty (name))
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return null;
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Key file_key = null;
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var basename = Encodings.cp932.GetBytes (Path.GetFileNameWithoutExtension (name));
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if (name != "SCRIPT.LPK")
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CurrentFileMap.TryGetValue (name, out file_key);
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try
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{
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var arc = Open (basename, file, CurrentScheme, file_key);
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if (null != arc)
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return arc;
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}
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catch { /* unknown encryption, ignore parse errors */ }
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var new_scheme = QueryEncryptionScheme();
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if (new_scheme == CurrentScheme && !CurrentScheme.ImportGameInit)
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return null;
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CurrentScheme = new_scheme;
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if (name != "SCRIPT.LPK" && CurrentScheme.ImportGameInit)
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{
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if (0 == CurrentFileMap.Count)
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ImportKeys (file.Name);
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}
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if (CurrentFileMap.Count > 0 && !CurrentFileMap.TryGetValue (name, out file_key))
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return null;
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return Open (basename, file, CurrentScheme, file_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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if (0 == entry.Size)
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return Stream.Null;
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var larc = arc as LuciArchive;
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var lent = entry as LuciEntry;
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Stream input = arc.File.CreateStream (entry.Offset, entry.Size);
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if (null == larc || null == lent)
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return input;
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byte[] data;
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using (input)
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{
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if (lent.IsPacked)
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{
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using (var reader = new LzssReader (input, (int)lent.Size, (int)lent.UnpackedSize))
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{
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reader.Unpack();
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data = reader.Data;
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}
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}
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else
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{
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data = new byte[lent.Size];
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input.Read (data, 0, data.Length);
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}
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}
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if (larc.Info.WholeCrypt)
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{
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DecryptContent (data, larc.Scheme.ContentXor);
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}
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if (larc.Info.IsEncrypted)
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{
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int count = Math.Min (data.Length, 0x100);
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if (count != 0)
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DecryptEntry (data, count, larc.Info.Key, larc.Scheme.RotatePattern);
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}
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input = new MemoryStream (data);
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if (null != larc.Info.Prefix)
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return new PrefixStream (larc.Info.Prefix, input);
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else
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return input;
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}
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static void DecryptContent (byte[] data, byte key)
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{
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for (int i = 0; i < data.Length; ++i)
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{
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int v = data[i] ^ key;
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data[i] = Binary.RotByteR ((byte)v, 4);
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}
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}
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static unsafe void DecryptEntry (byte[] data, int length, uint key, uint pattern)
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{
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fixed (byte* buf_raw = data)
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{
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uint* encoded = (uint*)buf_raw;
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length /= 4;
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for (int i = 0; i < length; ++i)
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{
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encoded[i] ^= key;
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pattern = Binary.RotR (pattern, 4);
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key = Binary.RotL (key, (int)pattern);
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}
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}
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}
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static unsafe void DecryptIndex (byte[] data, int length, uint key, uint pattern)
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{
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fixed (byte* buf_raw = data)
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{
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uint* encoded = (uint*)buf_raw;
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length /= 4;
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for (int i = 0; i < length; ++i)
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{
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encoded[i] ^= key;
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pattern = Binary.RotL (pattern, 4);
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key = Binary.RotR (key, (int)pattern);
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}
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}
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}
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ArcFile Open (byte[] basename, ArcView file, EncryptionScheme scheme, Key key)
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{
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uint key1 = scheme.BaseKey.Key1;
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uint key2 = scheme.BaseKey.Key2;
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for (int b = 0, e = basename.Length-1; e >= 0; ++b, --e)
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{
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key1 ^= basename[e];
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key2 ^= basename[b];
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key1 = Binary.RotR (key1, 7);
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key2 = Binary.RotL (key2, 7);
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}
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if (null != key)
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{
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key1 ^= key.Key1;
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key2 ^= key.Key2;
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}
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uint code = file.View.ReadUInt32 (4) ^ key2;
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int index_size = (int)(code & 0xffffff);
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byte flags = (byte)(code >> 24);
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if (0 != (flags & 1))
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index_size = (index_size << 11) - 8;
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if (index_size < 5 || index_size >= file.MaxOffset)
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return null;
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var index = new byte[index_size];
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if (index_size != file.View.Read (8, index, 0, (uint)index_size))
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return null;
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DecryptIndex (index, index_size, key2, scheme.RotatePattern);
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var lpk_info = new LpkInfo
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{
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AlignedOffset = 0 != (flags & 1),
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Flag1 = 0 != (flags & 2),
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IsEncrypted = 0 != (flags & 4),
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PackedEntries = 0 != (flags & 8),
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WholeCrypt = 0 != (flags & 0x10),
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Key = key1
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};
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var reader = new IndexReader (lpk_info);
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var dir = reader.Read (index);
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if (null == dir)
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return null;
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// this condition is fishy, probably patch files have additional bitflag set
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if (lpk_info.WholeCrypt && Binary.AsciiEqual (basename, "PATCH"))
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lpk_info.WholeCrypt = false;
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return new LuciArchive (file, this, dir, scheme, reader.Info);
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}
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static readonly byte[] ScriptName = Encoding.ASCII.GetBytes ("SCRIPT");
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void ImportKeys (string source_name)
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{
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var script_lpk = VFS.CombinePath (Path.GetDirectoryName (source_name), "SCRIPT.LPK");
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using (var script_file = VFS.OpenView (script_lpk))
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using (var script_arc = Open (ScriptName, script_file, CurrentScheme, null))
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{
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if (null == script_arc)
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throw new UnknownEncryptionScheme();
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var entry = script_arc.Dir.FirstOrDefault (e => e.Name.Equals ("gameinit.sob", StringComparison.InvariantCultureIgnoreCase));
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if (null == entry)
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throw new FileNotFoundException ("Missing 'gameinit.sob' entry in SCRIPT.LPK");
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using (var gameinit = script_arc.OpenEntry (entry))
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{
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var init_data = new byte[gameinit.Length];
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gameinit.Read (init_data, 0, init_data.Length);
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if (!ParseGameInit (init_data))
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throw new UnknownEncryptionScheme();
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}
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}
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}
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bool ParseGameInit (byte[] sob)
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{
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CurrentFileMap.Clear();
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if (!Binary.AsciiEqual (sob, "SOB0"))
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return false;
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int offset = LittleEndian.ToInt32 (sob, 4) + 8;
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if (offset <= 0 || offset >= sob.Length)
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return false;
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unsafe
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{
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fixed (byte* buf_raw = sob)
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{
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uint* p = (uint*)(buf_raw + offset);
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uint index_len = *p;
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if (offset+8+(int)index_len >= sob.Length)
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return false;
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p += 2;
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uint* last = p + index_len / 4 - 28;
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while (p < last)
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{
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if (p[0] == 0x28 && p[1] == 0 && p[2] != 0 && p[3] == 8 &&
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p[4] == 1 && p[5] == 8 && p[6] == 1 && p[7] == 8 &&
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p[8] != 0 && p[9] == 8 && p[10] != 0 && p[11] == 5 &&
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p[17] == 0x28 && p[18] == 0 && p[19] != 0 && p[20] == 8 &&
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p[21] != 0 && p[22] == 8 && p[23] == 0xffffffff && p[24] == 8 &&
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p[25] == 1 && p[26] == 8 && p[27] == 1 && p[28] == 5)
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{
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byte* lpk = (byte*)p + p[21] - p[2] + 0x34;
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int name_index = (int)(lpk - buf_raw);
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if (name_index < 0 || name_index >= sob.Length)
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{
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++p;
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continue;
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}
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string name = Binary.GetCString (sob, name_index, sob.Length-name_index);
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name = name.ToUpperInvariant();
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CurrentFileMap[name] = new Key (p[8], p[10]);
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p += 0x22;
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} else
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++p;
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}
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return CurrentFileMap.Count > 0;
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}
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}
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}
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public override ResourceOptions GetDefaultOptions ()
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{
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return new LuciOptions { Scheme = Settings.Default.LPKScheme };
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}
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public override object GetAccessWidget ()
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{
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return new GUI.WidgetLPK();
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}
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EncryptionScheme QueryEncryptionScheme ()
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{
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CurrentFileMap.Clear();
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var options = Query<LuciOptions> (arcStrings.ArcEncryptedNotice);
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if (null == options)
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return DefaultScheme;
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string title = options.Scheme;
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Dictionary<string, Key> file_map;
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if (KnownKeys.TryGetValue (title, out file_map))
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CurrentFileMap = new Dictionary<string, Key> (file_map);
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return KnownSchemes[title];
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}
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public override ResourceScheme Scheme
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{
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get { return new LpkScheme { KnownSchemes = KnownSchemes, KnownKeys = KnownKeys }; }
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set
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{
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var scheme = (LpkScheme)value;
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KnownSchemes = scheme.KnownSchemes;
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KnownKeys = scheme.KnownKeys;
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foreach (var key in KnownSchemes.Keys.Where (x => null == KnownSchemes[x]).ToArray())
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{
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KnownSchemes[key] = DefaultScheme;
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}
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}
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}
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}
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internal class IndexReader
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{
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byte[] m_index;
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LpkInfo m_info;
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List<Entry> m_dir;
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byte[] m_name;
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int m_index_width;
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int m_entries_offset;
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public LpkInfo Info { get { return m_info; } }
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public int EntrySize { get; private set; }
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public IndexReader (LpkInfo info)
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{
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if (!info.Flag1)
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throw new NotSupportedException ("Not supported LPK index format");
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m_info = info;
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EntrySize = m_info.PackedEntries ? 13 : 9;
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}
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public List<Entry> Read (byte[] index)
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{
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m_index = index;
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int count = LittleEndian.ToInt32 (m_index, 0);
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if (count <= 0 || count > 0xfffff)
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return null;
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int index_offset = 4;
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int prefix_length = m_index[index_offset++];
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if (0 != prefix_length)
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{
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m_info.Prefix = new byte[prefix_length];
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Buffer.BlockCopy (m_index, index_offset, m_info.Prefix, 0, prefix_length);
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index_offset += prefix_length;
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}
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m_index_width = 0 != m_index[index_offset++] ? 4 : 2;
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int letter_table_length = LittleEndian.ToInt32 (m_index, index_offset);
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index_offset += 4;
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m_entries_offset = index_offset + letter_table_length;
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if (m_entries_offset >= m_index.Length)
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return null;
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if ((m_index.Length - m_entries_offset) / EntrySize < count)
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EntrySize = (m_index.Length - m_entries_offset) / count;
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if (EntrySize < 8 || m_info.PackedEntries && EntrySize < 12)
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return null;
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m_dir = new List<Entry> (count);
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m_name = new byte[260];
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TraverseIndex (index_offset, 0);
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return m_dir.Count == count ? m_dir : null;
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}
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void TraverseIndex (int index_offset, int name_length)
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{
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if (index_offset < 0 || index_offset >= m_index.Length)
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throw new InvalidFormatException ("Error parsing LPK index");
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if (name_length >= m_name.Length)
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throw new InvalidFormatException ("Entry filename is too long");
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int entries = m_index[index_offset++];
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for (int i = 0; i < entries; ++i)
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{
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byte next_letter = m_index[index_offset++];
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int next_offset = 4 == m_index_width ? LittleEndian.ToInt32 (m_index, index_offset)
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: (int)LittleEndian.ToUInt16 (m_index, index_offset);
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m_name[name_length] = next_letter;
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index_offset += m_index_width;;
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if (0 != next_letter)
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TraverseIndex (index_offset+next_offset, name_length+1);
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else
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AddEntry (name_length, next_offset);
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}
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}
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void AddEntry (int name_length, int entry_num)
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{
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if (name_length < 1)
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throw new InvalidFormatException ("Invalid LPK entry name");
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string name = Encodings.cp932.GetString (m_name, 0, name_length);
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var entry = FormatCatalog.Instance.Create<LuciEntry> (name);
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int entry_pos = m_entries_offset + EntrySize * entry_num;
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if (entry_pos+EntrySize > m_index.Length)
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throw new InvalidFormatException ("Invalid LPK entry index");
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if (0 != (EntrySize & 1))
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entry.Flag = m_index[entry_pos++];
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long offset = LittleEndian.ToUInt32 (m_index, entry_pos);
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entry.Offset = m_info.AlignedOffset ? offset << 11 : offset;
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entry.Size = LittleEndian.ToUInt32 (m_index, entry_pos+4);
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entry.UnpackedSize = entry.Size;
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if (m_info.PackedEntries)
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{
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uint unpacked_size = LittleEndian.ToUInt32 (m_index, entry_pos+8);
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entry.IsPacked = unpacked_size != 0;
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if (entry.IsPacked)
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entry.UnpackedSize = unpacked_size;
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}
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m_dir.Add (entry);
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}
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}
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}
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