mirror of
https://github.com/crskycode/GARbro.git
synced 2024-11-27 15:44:00 +08:00
899 lines
35 KiB
C#
899 lines
35 KiB
C#
//! \file ArcXP3.cs
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//! \date Wed Jul 16 13:58:17 2014
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//! \brief KiriKiri engine archive implementation.
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//
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using System;
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using System.IO;
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using System.IO.MemoryMappedFiles;
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using System.Text;
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using System.Linq;
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using System.Collections.Generic;
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using System.ComponentModel.Composition;
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using System.Runtime.InteropServices;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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using System.Diagnostics;
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using GameRes.Utility;
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using ZLibNet;
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using GameRes.Formats.Strings;
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using GameRes.Formats.Properties;
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namespace GameRes.Formats.KiriKiri
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{
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public struct Xp3Segment
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{
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public bool IsCompressed;
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public long Offset;
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public uint Size;
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public uint PackedSize;
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}
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public class Xp3Entry : PackedEntry
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{
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List<Xp3Segment> m_segments = new List<Xp3Segment>();
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public bool IsEncrypted { get; set; }
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public ICrypt Cipher { get; set; }
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public ICollection<Xp3Segment> Segments { get { return m_segments; } }
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public uint Hash { get; set; }
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}
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// Archive version 1: encrypt file first, then calculate checksum
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// version 2: calculate checksum, then encrypt
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[Export(typeof(ArchiveFormat))]
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public class Xp3Opener : ArchiveFormat
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{
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public override string Tag { get { return "XP3"; } }
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public override string Description { get { return arcStrings.XP3Description; } }
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public override uint Signature { get { return 0x0d335058; } }
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public override bool IsHierarchic { get { return true; } }
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public override bool CanCreate { get { return true; } }
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private static readonly ICrypt NoCryptAlgorithm = new NoCrypt();
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public static readonly Dictionary<string, ICrypt> KnownSchemes = new Dictionary<string, ICrypt> {
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{ arcStrings.ArcNoEncryption, NoCryptAlgorithm },
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{ "Fate/Stay Night", new FateCrypt() },
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{ "Swan Song", new SwanSongCrypt() },
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{ "Cafe Sourire", new XorCrypt (0xcd) },
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{ "Seirei Tenshou", new SeitenCrypt() },
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{ "Okiba ga Nai!", new OkibaCrypt() },
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};
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public override ArcFile TryOpen (ArcView file)
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{
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if (!file.View.AsciiEqual (0, "XP3\x0d\x0a\x20\x0a\x1a\x8b\x67\x01"))
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return null;
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long dir_offset = file.View.ReadInt64 (0x0b);
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if (0x17 == dir_offset)
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{
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if (1 != file.View.ReadUInt32 (0x13))
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return null;
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if (0x80 != file.View.ReadUInt32 (0x17))
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return null;
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dir_offset = file.View.ReadInt64 (0x20);
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}
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if (dir_offset >= file.MaxOffset)
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return null;
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int header_type = file.View.ReadByte (dir_offset);
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if (0 != header_type && 1 != header_type)
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return null;
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Stream header_stream;
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if (0 == header_type) // read unpacked header
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{
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long header_size = file.View.ReadInt64 (dir_offset+1);
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if (header_size > uint.MaxValue)
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return null;
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header_stream = file.CreateStream (dir_offset+9, (uint)header_size);
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}
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else // read packed header
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{
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long packed_size = file.View.ReadInt64 (dir_offset+1);
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if (packed_size > uint.MaxValue)
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return null;
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long header_size = file.View.ReadInt64 (dir_offset+9);
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using (var input = file.CreateStream (dir_offset+17, (uint)packed_size))
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header_stream = ZLibCompressor.DeCompress (input);
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}
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var crypt_algorithm = new Lazy<ICrypt> (QueryCryptAlgorithm);
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var dir = new List<Entry>();
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dir_offset = 0;
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using (var header = new BinaryReader (header_stream, Encoding.Unicode))
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{
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while (-1 != header.PeekChar())
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{
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uint entry_signature = header.ReadUInt32();
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if (0x656c6946 != entry_signature) // "File"
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{
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break;
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}
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long entry_size = header.ReadInt64();
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dir_offset += 12 + entry_size;
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var entry = new Xp3Entry();
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while (entry_size > 0)
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{
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uint section = header.ReadUInt32();
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long section_size = header.ReadInt64();
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entry_size -= 12;
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if (section_size > entry_size)
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break;
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entry_size -= section_size;
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long next_section_pos = header.BaseStream.Position + section_size;
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switch (section)
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{
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case 0x6f666e69: // "info"
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{
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if (entry.Size != 0 || !string.IsNullOrEmpty (entry.Name))
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{
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goto NextEntry; // ambiguous entry, ignore
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}
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entry.IsEncrypted = 0 != header.ReadUInt32();
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long file_size = header.ReadInt64();
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long packed_size = header.ReadInt64();
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if (file_size > uint.MaxValue || packed_size > uint.MaxValue)
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{
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goto NextEntry;
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}
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entry.IsPacked = file_size != packed_size;
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entry.Size = (uint)packed_size;
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entry.UnpackedSize = (uint)file_size;
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int name_size = header.ReadInt16();
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if (name_size > 0x100 || name_size <= 0)
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{
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goto NextEntry;
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}
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if (entry.IsEncrypted)
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entry.Cipher = crypt_algorithm.Value;
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else
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entry.Cipher = NoCryptAlgorithm;
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char[] name = header.ReadChars (name_size);
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entry.Name = new string (name);
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entry.Type = FormatCatalog.Instance.GetTypeFromName (entry.Name);
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break;
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}
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case 0x6d676573: // "segm"
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{
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int segment_count = (int)(section_size / 0x1c);
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if (segment_count > 0)
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{
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for (int i = 0; i < segment_count; ++i)
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{
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bool compressed = 0 != header.ReadInt32();
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long segment_offset = header.ReadInt64();
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long segment_size = header.ReadInt64();
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long segment_packed_size = header.ReadInt64();
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if (segment_offset > file.MaxOffset || segment_size > file.MaxOffset
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|| segment_packed_size > file.MaxOffset)
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{
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goto NextEntry;
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}
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var segment = new Xp3Segment {
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IsCompressed = compressed,
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Offset = segment_offset,
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Size = (uint)segment_size,
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PackedSize = (uint)segment_packed_size
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};
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entry.Segments.Add (segment);
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}
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entry.Offset = entry.Segments.First().Offset;
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}
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break;
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}
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case 0x726c6461: // "adlr"
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if (4 == section_size)
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entry.Hash = header.ReadUInt32();
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break;
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default: // unknown section
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break;
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}
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header.BaseStream.Position = next_section_pos;
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}
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if (!string.IsNullOrEmpty (entry.Name) && entry.Segments.Any())
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{
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dir.Add (entry);
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Trace.WriteLine (string.Format ("{0,-16} {3:X8} {1,11} {2,12}", entry.Name,
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entry.IsEncrypted ? "[encrypted]" : "",
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entry.Segments.First().IsCompressed ? "[compressed]" : "",
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entry.Hash));
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}
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NextEntry:
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header.BaseStream.Position = dir_offset;
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}
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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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var xp3_entry = entry as Xp3Entry;
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if (null == xp3_entry)
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return arc.File.CreateStream (entry.Offset, entry.Size);
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if (1 == xp3_entry.Segments.Count && !xp3_entry.IsEncrypted)
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{
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var segment = xp3_entry.Segments.First();
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if (segment.IsCompressed)
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return new ZLibStream (arc.File.CreateStream (segment.Offset, segment.PackedSize),
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CompressionMode.Decompress);
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else
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return arc.File.CreateStream (segment.Offset, segment.Size);
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}
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return new Xp3Stream (arc.File, xp3_entry);
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}
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public override ResourceOptions GetOptions ()
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{
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return new ResourceOptions {
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Widget = new GUI.CreateXP3Widget()
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};
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}
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ICrypt QueryCryptAlgorithm ()
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{
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var widget = new GUI.WidgetXP3();
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var args = new ParametersRequestEventArgs
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{
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Notice = arcStrings.ArcEncryptedNotice,
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InputWidget = widget,
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};
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FormatCatalog.Instance.InvokeParametersRequest (this, args);
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if (!args.InputResult)
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throw new OperationCanceledException();
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return widget.GetScheme();
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}
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public static ICrypt GetScheme (string scheme)
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{
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ICrypt algorithm = NoCryptAlgorithm;
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if (!string.IsNullOrEmpty (scheme))
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{
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KnownSchemes.TryGetValue (scheme, out algorithm);
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}
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return algorithm;
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}
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static uint GetFileCheckSum (Stream src)
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{
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// compute file checksum via adler32.
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// src's file pointer should be reset to zero.
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var sum = new Adler32();
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byte[] buf = new byte[64*1024];
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for (;;)
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{
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int read = src.Read (buf, 0, buf.Length);
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if (0 == read) break;
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sum.Update (buf, 0, read);
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}
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return sum.Value;
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}
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static readonly byte[] s_xp3_header = {
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(byte)'X', (byte)'P', (byte)'3', 0x0d, 0x0a, 0x20, 0x0a, 0x1a, 0x8b, 0x67, 0x01
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};
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public override void Create (Stream output, IEnumerable<Entry> list, ResourceOptions options)
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{
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int version = Settings.Default.XP3Version;
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ICrypt scheme = NoCryptAlgorithm;
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bool compress_header = Settings.Default.XP3CompressHeader;
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bool compress_contents = Settings.Default.XP3CompressContents;
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bool retain_dirs = Settings.Default.XP3RetainStructure;
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var widget = options.Widget as GUI.CreateXP3Widget;
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if (null != widget)
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{
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scheme = widget.EncryptionWidget.GetScheme();
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}
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bool use_encryption = scheme != NoCryptAlgorithm;
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using (var writer = new BinaryWriter (output, Encoding.ASCII, true))
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{
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writer.Write (s_xp3_header);
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if (2 == version)
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{
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writer.Write ((long)0x17);
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writer.Write ((int)1);
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writer.Write ((byte)0x80);
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writer.Write ((long)0);
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}
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long index_pos_offset = writer.BaseStream.Position;
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writer.BaseStream.Seek (8, SeekOrigin.Current);
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var used_names = new HashSet<string>();
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var dir = new List<Xp3Entry>();
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long current_offset = writer.BaseStream.Position;
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foreach (var entry in list)
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{
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string name = entry.Name;
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if (!retain_dirs)
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name = Path.GetFileName (name);
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else
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name = name.Replace (@"\", "/");
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if (!used_names.Add (name))
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{
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Trace.WriteLine ("duplicate name", entry.Name);
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continue;
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}
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var xp3entry = new Xp3Entry {
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Name = name,
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IsEncrypted = use_encryption,
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Cipher = scheme,
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};
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bool compress = compress_contents && ShouldCompressFile (entry);
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if (!use_encryption)
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RawFileCopy (entry.Name, xp3entry, output, compress);
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else
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EncryptedFileCopy (entry.Name, xp3entry, output, compress);
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dir.Add (xp3entry);
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}
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long index_pos = writer.BaseStream.Position;
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writer.BaseStream.Position = index_pos_offset;
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writer.Write (index_pos);
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writer.BaseStream.Position = index_pos;
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using (var header = new BinaryWriter (new MemoryStream (dir.Count*0x58), Encoding.Unicode))
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{
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long dir_pos = 0;
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foreach (var entry in dir)
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{
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header.BaseStream.Position = dir_pos;
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header.Write ((uint)0x656c6946); // "File"
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long header_size_pos = header.BaseStream.Position;
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header.Write ((long)0);
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header.Write ((uint)0x6f666e69); // "info"
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header.Write ((long)(4+8+8+2 + entry.Name.Length*2));
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header.Write ((uint)(use_encryption ? 0x80000000 : 0));
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header.Write ((long)entry.UnpackedSize);
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header.Write ((long)entry.Size);
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header.Write ((short)entry.Name.Length);
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foreach (char c in entry.Name)
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header.Write (c);
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header.Write ((uint)0x6d676573); // "segm"
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header.Write ((long)0x1c);
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var segment = entry.Segments.First();
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header.Write ((int)(segment.IsCompressed ? 1 : 0));
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header.Write ((long)segment.Offset);
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header.Write ((long)segment.Size);
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header.Write ((long)segment.PackedSize);
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header.Write ((uint)0x726c6461); // "adlr"
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header.Write ((long)4);
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header.Write ((uint)entry.Hash);
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dir_pos = header.BaseStream.Position;
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long header_size = dir_pos - header_size_pos - 8;
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header.BaseStream.Position = header_size_pos;
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header.Write (header_size);
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}
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header.BaseStream.Position = 0;
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writer.Write ((byte)(compress_header ? 1 : 0));
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long unpacked_dir_size = header.BaseStream.Length;
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if (compress_header)
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{
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long packed_dir_size_pos = writer.BaseStream.Position;
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writer.Write ((long)0);
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writer.Write (unpacked_dir_size);
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long dir_start = writer.BaseStream.Position;
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using (var zstream = new ZLibStream (writer.BaseStream, CompressionMode.Compress, true))
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header.BaseStream.CopyTo (zstream);
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long packed_dir_size = writer.BaseStream.Position - dir_start;
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writer.BaseStream.Position = packed_dir_size_pos;
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writer.Write (packed_dir_size);
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}
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else
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{
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writer.Write (unpacked_dir_size);
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header.BaseStream.CopyTo (writer.BaseStream);
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}
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}
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}
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output.Seek (0, SeekOrigin.End);
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}
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void RawFileCopy (string name, Xp3Entry xp3entry, Stream output, bool compress)
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{
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using (var file = File.Open (name, FileMode.Open, FileAccess.Read))
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{
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if (file.Length > uint.MaxValue)
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throw new FileSizeException();
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uint unpacked_size = (uint)file.Length;
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xp3entry.UnpackedSize = (uint)unpacked_size;
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xp3entry.Size = (uint)unpacked_size;
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var segment = new Xp3Segment {
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IsCompressed = compress,
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Offset = output.Position,
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Size = unpacked_size,
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PackedSize = unpacked_size
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};
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if (compress)
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{
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using (var zstream = new ZLibStream (output, CompressionMode.Compress, true))
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{
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xp3entry.Hash = CheckedCopy (file, zstream);
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zstream.Flush();
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segment.PackedSize = (uint)zstream.TotalOut;
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}
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}
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else
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{
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xp3entry.Hash = CheckedCopy (file, output);
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}
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xp3entry.Segments.Add (segment);
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}
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}
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void EncryptedFileCopy (string name, Xp3Entry xp3entry, Stream output, bool compress)
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{
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var file = File.Open (name, FileMode.Open, FileAccess.Read);
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using (var map = MemoryMappedFile.CreateFromFile (file, null, 0,
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MemoryMappedFileAccess.Read, null, HandleInheritability.None, false))
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{
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if (file.Length > int.MaxValue)
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throw new FileSizeException();
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uint unpacked_size = (uint)file.Length;
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xp3entry.UnpackedSize = (uint)unpacked_size;
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xp3entry.Size = (uint)unpacked_size;
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using (var view = map.CreateViewAccessor (0, unpacked_size, MemoryMappedFileAccess.Read))
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{
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var segment = new Xp3Segment {
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IsCompressed = compress,
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Offset = output.Position,
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Size = unpacked_size,
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PackedSize = unpacked_size,
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};
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xp3entry.Segments.Add (segment);
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bool need_output_dispose = false;
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if (compress)
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{
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output = new ZLibStream (output, CompressionMode.Compress, true);
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need_output_dispose = true;
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}
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unsafe
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{
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byte[] read_buffer = new byte[81920];
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byte* ptr = view.GetPointer (0);
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try
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{
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var checksum = new Adler32();
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if (!xp3entry.Cipher.HashAfterCrypt)
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xp3entry.Hash = checksum.Update (ptr, (int)unpacked_size);
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int offset = 0;
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int remaining = (int)unpacked_size;
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while (remaining > 0)
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{
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int amount = Math.Min (remaining, read_buffer.Length);
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remaining -= amount;
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Marshal.Copy ((IntPtr)(ptr+offset), read_buffer, 0, amount);
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xp3entry.Cipher.Encrypt (xp3entry, offset, read_buffer, 0, amount);
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if (xp3entry.Cipher.HashAfterCrypt)
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checksum.Update (read_buffer, 0, amount);
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output.Write (read_buffer, 0, amount);
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offset += amount;
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}
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if (xp3entry.Cipher.HashAfterCrypt)
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xp3entry.Hash = checksum.Value;
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if (compress)
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{
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output.Flush();
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segment.PackedSize = (uint)(output as ZLibStream).TotalOut;
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}
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}
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finally
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{
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view.SafeMemoryMappedViewHandle.ReleasePointer();
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if (need_output_dispose)
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output.Dispose();
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}
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}
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}
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}
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}
|
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|
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uint CheckedCopy (Stream src, Stream dst)
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{
|
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var checksum = new Adler32();
|
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var read_buffer = new byte[81920];
|
|
for (;;)
|
|
{
|
|
int read = src.Read (read_buffer, 0, read_buffer.Length);
|
|
if (0 == read)
|
|
break;
|
|
checksum.Update (read_buffer, 0, read);
|
|
dst.Write (read_buffer, 0, read);
|
|
}
|
|
return checksum.Value;
|
|
}
|
|
|
|
bool ShouldCompressFile (Entry entry)
|
|
{
|
|
if ("image" == entry.Type || "archive" == entry.Type)
|
|
return false;
|
|
var ext = Path.GetExtension (entry.Name);
|
|
if (!string.IsNullOrEmpty (ext) && ext.Equals (".ogg", StringComparison.OrdinalIgnoreCase))
|
|
return false;
|
|
return true;
|
|
}
|
|
}
|
|
|
|
public class Xp3Stream : Stream
|
|
{
|
|
ArcView m_file;
|
|
Xp3Entry m_entry;
|
|
IEnumerator<Xp3Segment> m_segment;
|
|
Stream m_stream;
|
|
long m_offset = 0;
|
|
bool m_eof = false;
|
|
|
|
public override bool CanRead { get { return true; } }
|
|
public override bool CanSeek { get { return false; } }
|
|
public override bool CanWrite { get { return false; } }
|
|
public override long Length { get { return m_entry.UnpackedSize; } }
|
|
public override long Position
|
|
{
|
|
get { return m_offset; }
|
|
set { throw new NotSupportedException ("Xp3Stream.Position not supported."); }
|
|
}
|
|
|
|
public Xp3Stream (ArcView file, Xp3Entry entry)
|
|
{
|
|
m_file = file;
|
|
m_entry = entry;
|
|
m_segment = entry.Segments.GetEnumerator();
|
|
NextSegment();
|
|
}
|
|
|
|
private void NextSegment ()
|
|
{
|
|
if (!m_segment.MoveNext())
|
|
{
|
|
m_eof = true;
|
|
return;
|
|
}
|
|
if (null != m_stream)
|
|
m_stream.Dispose();
|
|
var segment = m_segment.Current;
|
|
if (segment.IsCompressed)
|
|
m_stream = new ZLibStream (m_file.CreateStream (segment.Offset, segment.PackedSize),
|
|
CompressionMode.Decompress);
|
|
else
|
|
m_stream = m_file.CreateStream (segment.Offset, segment.Size);
|
|
}
|
|
|
|
public override int Read (byte[] buffer, int offset, int count)
|
|
{
|
|
int total = 0;
|
|
while (!m_eof && count > 0)
|
|
{
|
|
int read = m_stream.Read (buffer, offset, count);
|
|
m_entry.Cipher.Decrypt (m_entry, m_offset, buffer, offset, read);
|
|
m_offset += read;
|
|
total += read;
|
|
offset += read;
|
|
count -= read;
|
|
if (0 != count)
|
|
NextSegment();
|
|
}
|
|
return total;
|
|
}
|
|
|
|
public override int ReadByte ()
|
|
{
|
|
int b = -1;
|
|
while (!m_eof)
|
|
{
|
|
b = m_stream.ReadByte();
|
|
if (-1 != b)
|
|
{
|
|
b = m_entry.Cipher.Decrypt (m_entry, m_offset++, (byte)b);
|
|
break;
|
|
}
|
|
NextSegment();
|
|
}
|
|
return b;
|
|
}
|
|
|
|
public override void Flush ()
|
|
{
|
|
}
|
|
|
|
public override long Seek (long offset, SeekOrigin origin)
|
|
{
|
|
throw new NotSupportedException ("Xp3Stream.Seek method is not supported");
|
|
}
|
|
|
|
public override void SetLength (long length)
|
|
{
|
|
throw new NotSupportedException ("Xp3Stream.SetLength method is not supported");
|
|
}
|
|
|
|
public override void Write (byte[] buffer, int offset, int count)
|
|
{
|
|
throw new NotSupportedException ("Xp3Stream.Write method is not supported");
|
|
}
|
|
|
|
public override void WriteByte (byte value)
|
|
{
|
|
throw new NotSupportedException("Xp3Stream.WriteByte method is not supported");
|
|
}
|
|
|
|
#region IDisposable Members
|
|
bool disposed = false;
|
|
protected override void Dispose (bool disposing)
|
|
{
|
|
if (!disposed)
|
|
{
|
|
m_file = null;
|
|
if (null != m_stream)
|
|
{
|
|
m_stream.Dispose();
|
|
m_stream = null;
|
|
}
|
|
disposed = true;
|
|
base.Dispose (disposing);
|
|
}
|
|
}
|
|
#endregion
|
|
}
|
|
|
|
public abstract class ICrypt
|
|
{
|
|
/// <summary>
|
|
/// whether Adler32 checksum should be calculated after contents have been encrypted.
|
|
/// </summary>
|
|
public virtual bool HashAfterCrypt { get { return false; } }
|
|
|
|
public abstract byte Decrypt (Xp3Entry entry, long offset, byte value);
|
|
|
|
public virtual void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
for (int i = 0; i < count; ++i)
|
|
values[pos+i] = this.Decrypt (entry, offset+i, values[pos+i]);
|
|
}
|
|
|
|
public virtual void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
throw new NotImplementedException ("Encryption method not implemented");
|
|
}
|
|
}
|
|
|
|
public class NoCrypt : ICrypt
|
|
{
|
|
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
|
|
{
|
|
return value;
|
|
}
|
|
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
return;
|
|
}
|
|
public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
return;
|
|
}
|
|
}
|
|
|
|
internal class FateCrypt : ICrypt
|
|
{
|
|
public override bool HashAfterCrypt { get { return true; } }
|
|
|
|
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
|
|
{
|
|
byte result = (byte)(value ^ 0x36);
|
|
if (0x13 == offset)
|
|
result ^= 1;
|
|
else if (0x2ea29 == offset)
|
|
result ^= 3;
|
|
return result;
|
|
}
|
|
|
|
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
values[pos+i] ^= 0x36;
|
|
}
|
|
if (offset > 0x2ea29)
|
|
return;
|
|
if (offset + count > 0x2ea29)
|
|
values[pos+0x2ea29-offset] ^= 3;
|
|
if (offset > 0x13)
|
|
return;
|
|
if (offset + count > 0x13)
|
|
values[pos+0x13-offset] ^= 1;
|
|
}
|
|
|
|
public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
Decrypt (entry, offset, values, pos, count);
|
|
}
|
|
}
|
|
|
|
internal class XorCrypt : ICrypt
|
|
{
|
|
private byte m_key;
|
|
|
|
public byte Key
|
|
{
|
|
get { return m_key; }
|
|
set { m_key = value; }
|
|
}
|
|
|
|
public XorCrypt (uint key)
|
|
{
|
|
m_key = (byte)key;
|
|
}
|
|
|
|
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
|
|
{
|
|
return (byte)(value ^ m_key);
|
|
}
|
|
|
|
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
values[pos+i] ^= m_key;
|
|
}
|
|
}
|
|
|
|
public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
Decrypt (entry, offset, values, pos, count);
|
|
}
|
|
}
|
|
|
|
internal class SwanSongCrypt : ICrypt
|
|
{
|
|
static private byte Adjust (uint hash, out int shift)
|
|
{
|
|
int cl = (int)(hash & 0xff);
|
|
if (0 == cl) cl = 0x0f;
|
|
shift = cl & 7;
|
|
int ch = (int)((hash >> 8) & 0xff);
|
|
if (0 == ch) ch = 0xf0;
|
|
return (byte)ch;
|
|
}
|
|
|
|
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
|
|
{
|
|
int shift;
|
|
byte xor = Adjust (entry.Hash, out shift);
|
|
uint data = (uint)(value ^ xor);
|
|
return (byte)((data >> shift) | (data << (8 - shift)));
|
|
}
|
|
|
|
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
int shift;
|
|
byte xor = Adjust (entry.Hash, out shift);
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
uint data = (uint)(values[pos+i] ^ xor);
|
|
values[pos+i] = (byte)((data >> shift) | (data << (8 - shift)));
|
|
}
|
|
}
|
|
|
|
public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
int shift;
|
|
byte xor = Adjust (entry.Hash, out shift);
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
uint data = values[pos+i];
|
|
data = (byte)((data << shift) | (data >> (8 - shift)));
|
|
values[pos+i] = (byte)(data ^ xor);
|
|
}
|
|
}
|
|
}
|
|
|
|
internal class SeitenCrypt : ICrypt
|
|
{
|
|
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
|
|
{
|
|
uint key = entry.Hash ^ (uint)offset;
|
|
if (0 != (key & 2))
|
|
{
|
|
int ecx = (int)key & 0x18;
|
|
value ^= (byte)((key >> ecx) | (key >> (ecx & 8)));
|
|
}
|
|
if (0 != (key & 4))
|
|
{
|
|
value += (byte)key;
|
|
}
|
|
if (0 != (key & 8))
|
|
{
|
|
value -= (byte)(key >> (int)(key & 0x10));
|
|
}
|
|
return value;
|
|
}
|
|
|
|
public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
uint key = entry.Hash ^ (uint)offset;
|
|
if (0 != (key & 8))
|
|
{
|
|
values[pos+i] += (byte)(key >> (int)(key & 0x10));
|
|
}
|
|
if (0 != (key & 4))
|
|
{
|
|
values[pos+i] -= (byte)key;
|
|
}
|
|
if (0 != (key & 2))
|
|
{
|
|
int ecx = (int)key & 0x18;
|
|
values[pos+i] ^= (byte)((key >> ecx) | (key >> (ecx & 8)));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
internal class OkibaCrypt : ICrypt
|
|
{
|
|
public override byte Decrypt (Xp3Entry entry, long offset, byte value)
|
|
{
|
|
if (offset < 0x65)
|
|
return (byte)(value ^ (byte)(entry.Hash >> 4));
|
|
uint key = entry.Hash;
|
|
// 0,1,2,3 -> 1,0,3,2
|
|
key = ((key & 0xff0000) << 8) | ((key & 0xff000000) >> 8)
|
|
| ((key & 0xff00) >> 8) | ((key & 0xff) << 8);
|
|
key >>= 8 * ((int)(offset - 0x65) & 3);
|
|
return (byte)(value ^ (byte)key);
|
|
}
|
|
|
|
public override void Decrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
int i = 0;
|
|
if (offset < 0x65)
|
|
{
|
|
uint key = entry.Hash >> 4;
|
|
int limit = Math.Min (count, (int)(0x65 - offset));
|
|
for (; i < limit; ++i)
|
|
{
|
|
values[pos+i] ^= (byte)key;
|
|
++offset;
|
|
}
|
|
}
|
|
if (i < count)
|
|
{
|
|
offset -= 0x65;
|
|
uint key = entry.Hash;
|
|
key = ((key & 0xff0000) << 8) | ((key & 0xff000000) >> 8)
|
|
| ((key & 0xff00) >> 8) | ((key & 0xff) << 8);
|
|
do
|
|
{
|
|
values[pos+i] ^= (byte)(key >> (8 * ((int)offset & 3)));
|
|
++offset;
|
|
}
|
|
while (++i < count);
|
|
}
|
|
}
|
|
|
|
public override void Encrypt (Xp3Entry entry, long offset, byte[] values, int pos, int count)
|
|
{
|
|
Decrypt (entry, offset, values, pos, count);
|
|
}
|
|
}
|
|
}
|