mirror of
https://github.com/crskycode/GARbro.git
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246 lines
9.0 KiB
C#
246 lines
9.0 KiB
C#
//! \file ArcARC.cs
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//! \date Sat Sep 19 22:24:12 2015
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//! \brief RPM engine resource archive.
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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 System.Text;
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using GameRes.Compression;
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using GameRes.Formats.Strings;
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using GameRes.Formats.Properties;
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using GameRes.Utility;
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namespace GameRes.Formats.Rpm
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{
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public class RpmOptions : ResourceOptions
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{
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public EncryptionScheme Scheme;
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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 string Keyword;
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public int NameLength;
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public EncryptionScheme (string key, int name_length = 32)
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{
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Keyword = key;
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NameLength = name_length;
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}
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}
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[Serializable]
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public class ArcScheme : ResourceScheme
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{
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public Dictionary<string, EncryptionScheme> KnownSchemes;
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}
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[Export(typeof(ArchiveFormat))]
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public class ArcOpener : ArchiveFormat
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{
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public override string Tag { get { return "ARC/RPM"; } }
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public override string Description { get { return "RPM engine resource archive"; } }
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public override uint Signature { get { return 0; } }
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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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public ArcOpener ()
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{
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Extensions = new string[] { "arc" };
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}
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public static Dictionary<string, EncryptionScheme> KnownSchemes = new Dictionary<string, EncryptionScheme>();
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public override ResourceScheme Scheme
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{
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get { return new ArcScheme { KnownSchemes = KnownSchemes }; }
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set { KnownSchemes = ((ArcScheme)value).KnownSchemes; }
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}
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/// <summary>Minimum entry length across all possible archive schemes.</summary>
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const int MinEntryLength = 0x24;
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public override ArcFile TryOpen (ArcView file)
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{
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int count = file.View.ReadInt32 (0);
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if (!IsSaneCount (count) || 8 + count * MinEntryLength >= file.MaxOffset)
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return null;
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uint is_compressed = file.View.ReadUInt32 (4);
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if (is_compressed > 1) // should be either 0 or 1
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return null;
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var scheme = GuessScheme (file, count);
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// additional filename extension check avoids dialog popup on false positives
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if (null == scheme && KnownSchemes.Count > 0 && file.Name.HasExtension (".arc"))
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scheme = QueryScheme();
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if (null == scheme)
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return null;
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// special case for "instdata.arc" archives
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if (scheme.Keyword != "inst"
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&& VFS.IsPathEqualsToFileName (file.Name, "instdata.arc"))
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scheme = new EncryptionScheme ("inst", scheme.NameLength);
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int index_size = count * (scheme.NameLength + 12);
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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, scheme.Keyword);
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uint data_offset = LittleEndian.ToUInt32 (index, scheme.NameLength + 8);
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if (data_offset != 8 + index_size)
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return null;
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int index_offset = 0;
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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, scheme.NameLength);
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index_offset += scheme.NameLength;
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var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
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entry.UnpackedSize = LittleEndian.ToUInt32 (index, index_offset);
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entry.Size = LittleEndian.ToUInt32 (index, index_offset+4);
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entry.Offset = LittleEndian.ToUInt32 (index, index_offset+8);
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entry.IsPacked = is_compressed != 0;
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if (0 != entry.Size)
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{
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if (entry.Offset < data_offset || !entry.CheckPlacement (file.MaxOffset))
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return null;
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}
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dir.Add (entry);
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index_offset += 12;
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}
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return new ArcFile (file, this, dir);
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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 input = arc.File.CreateStream (entry.Offset, entry.Size);
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var packed = entry as PackedEntry;
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if (null == packed || !packed.IsPacked)
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return input;
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return new LzssStream (input);
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}
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EncryptionScheme GuessScheme (ArcView file, int count)
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{
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int[] possible_sizes = { 0x20, 0x18 };
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byte[] first_entry = new byte[possible_sizes[0] + 12];
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if (first_entry.Length != file.View.Read (8, first_entry, 0, (uint)first_entry.Length))
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return null;
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byte[] key_bits = new byte[4];
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byte[] actual_offset = new byte[4];
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foreach (var name_length in possible_sizes)
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{
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int first_offset = 8 + count * (name_length + 12);
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if (first_offset >= file.MaxOffset)
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continue;
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LittleEndian.Pack (first_offset, actual_offset, 0);
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int i;
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for (i = 0; i < 4; ++i)
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{
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key_bits[i] = (byte)(first_entry[name_length+8+i] - actual_offset[i]);
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}
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int first_match = ReverseFind (first_entry, name_length-4, key_bits);
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if (first_match < 4)
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continue;
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int second_match = ReverseFind (first_entry, first_match-4, key_bits);
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if (second_match <= 0)
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continue;
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int key_length = first_match - second_match;
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byte[] key = new byte[key_length];
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for (i = 0; i < key_length; ++i)
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{
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byte sym = (byte)-first_entry[second_match+i];
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if (sym < 0x21 || sym > 0x7E)
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break;
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key[(second_match+i) % key_length] = sym;
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}
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if (i == key_length)
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return new EncryptionScheme (Encoding.ASCII.GetString (key), name_length);
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}
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return null;
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}
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static int ReverseFind (byte[] array, int pos, byte[] pattern)
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{
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int pattern_end_pos = pattern.Length-1;
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int pattern_pos = pattern_end_pos;
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for (int i = pos + pattern_pos; i >= 0; --i)
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{
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if (array[i] == pattern[pattern_pos])
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{
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if (0 == pattern_pos)
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return i;
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--pattern_pos;
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}
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else if (pattern_end_pos != pattern_pos)
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{
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i += pattern_end_pos - pattern_pos;
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pattern_pos = pattern_end_pos;
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}
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}
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return -1;
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}
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private void DecryptIndex (byte[] data, string 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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data[i] += (byte)key[i % key.Length];
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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 RpmOptions {
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Scheme = GetScheme (Settings.Default.RPMScheme),
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};
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}
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public override object GetAccessWidget ()
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{
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return new WidgetARC();
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}
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EncryptionScheme QueryScheme ()
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{
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var options = Query<RpmOptions> (arcStrings.RPMEncryptedNotice);
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return options.Scheme;
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}
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static EncryptionScheme GetScheme (string title)
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{
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EncryptionScheme scheme = null;
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KnownSchemes.TryGetValue (title, out scheme);
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return scheme;
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}
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}
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}
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