mirror of
https://github.com/crskycode/GARbro.git
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254 lines
9.1 KiB
C#
254 lines
9.1 KiB
C#
//! \file ArcDAT.cs
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//! \date 2017 Oct 27
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//! \brief RepiPack resource archive.
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//
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// Copyright (C) 2017 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.Cryptography;
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using GameRes.Utility;
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namespace GameRes.Formats.Littlewitch
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{
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[Serializable]
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public class RepiScheme : ResourceScheme
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{
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public IDictionary<string, uint[]> KnownSchemes;
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}
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internal class RepiEntry : PackedEntry
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{
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public bool HasEncryptionKey;
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public byte[] CreateKey ()
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{
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var name_bytes = Name.ToLowerShiftJis();
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int name_length = name_bytes.Length;
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var md5 = new MD5();
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Array.Reverse (name_bytes);
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var key = new byte[1024];
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int key_pos = 0;
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for (int i = 0; i < 64; ++i)
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{
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int name_pos = i % name_length;
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md5.Update (name_bytes, name_pos, name_length - name_pos);
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md5.Final();
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Buffer.BlockCopy (md5.State, 0, key, key_pos, 16);
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key_pos += 16;
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}
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return key;
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}
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}
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[Export(typeof(ArchiveFormat))]
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public class DatOpener : ArchiveFormat
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{
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public override string Tag { get { return "DAT/RepiPack"; } }
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public override string Description { get { return "Littlewitch engine resource archive"; } }
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public override uint Signature { get { return 0x69706552; } } // 'Repi'
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public override bool IsHierarchic { get { return false; } }
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public override bool CanWrite { get { return false; } }
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static readonly string ListFileName = "littlewitch.lst";
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public override ArcFile TryOpen (ArcView file)
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{
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if (!file.View.AsciiEqual (4, "Pack"))
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return null;
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int version = file.View.ReadInt32 (8);
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if (version != 5)
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return null;
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uint name_length = file.View.ReadUInt32 (0xC);
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if (name_length < 4)
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return null;
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uint name_key = file.View.ReadUInt32 (0x10);
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var key = FindKey (file.Name, name_key);
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if (null == key)
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return null;
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int count = file.View.ReadInt32 (0x10 + name_length);
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if (!IsSaneCount (count))
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return null;
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var index = file.View.ReadBytes (0x14 + name_length, (uint)count * 0x20);
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int pos = 0;
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var dir = new List<Entry> (count);
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var name_builder = new StringBuilder();
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for (int i = 0; i < count; ++i)
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{
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DecryptData (index, pos, 0x20, key[2], key[1]);
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var entry = EntryFromMd5 (index, pos, name_builder);
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entry.Offset = index.ToUInt32 (pos+0x10);
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entry.Size = index.ToUInt32 (pos+0x14);
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entry.UnpackedSize = index.ToUInt32 (pos+0x18);
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if (!entry.CheckPlacement (file.MaxOffset))
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return null;
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entry.IsPacked = entry.Size != entry.UnpackedSize;
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dir.Add (entry);
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pos += 0x20;
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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 rent = entry as RepiEntry;
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if (null == rent || !rent.HasEncryptionKey)
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return arc.File.CreateStream (entry.Offset, entry.Size);
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var key = rent.CreateKey();
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uint enc_length = Math.Min ((uint)key.Length, entry.Size);
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byte[] encrypted = arc.File.View.ReadBytes (entry.Offset, enc_length);
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DecryptEntry (encrypted, key);
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Stream input;
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if (enc_length == entry.Size)
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{
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input = new BinMemoryStream (encrypted, entry.Name);
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}
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else
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{
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input = arc.File.CreateStream (entry.Offset + enc_length, entry.Size - enc_length);
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input = new PrefixStream (encrypted, input);
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}
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if (rent.IsPacked)
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{
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input = new LzssStream (input);
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}
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return input;
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}
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static void DecryptEntry (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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data[i] ^= key[i];
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}
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}
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static unsafe void DecryptData (byte[] data, int pos, int length, uint key, uint seed)
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{
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if (pos < 0 || pos + length > data.Length)
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throw new ArgumentOutOfRangeException ("pos", "Invalid byte array index.");
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fixed (byte* data8 = &data[pos])
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{
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uint* data32 = (uint*)data8;
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for (int count = length / 4; count > 0; --count)
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{
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*data32 ^= key;
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key += Binary.RotL (*data32, 16) ^ seed;
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data32++;
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}
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}
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}
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RepiEntry EntryFromMd5 (byte[] data, int pos, StringBuilder builder)
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{
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var key = new CowArray<byte> (data, pos, 16).ToArray();
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string name;
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if (KnownNames.TryGetValue (key, out name))
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{
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var entry = FormatCatalog.Instance.Create<RepiEntry> (name);
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entry.HasEncryptionKey = true;
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return entry;
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}
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builder.Clear();
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for (int i = 0; i < 16; ++i)
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{
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builder.AppendFormat ("{0:x2}", key[i]);
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}
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return new RepiEntry { Name = builder.ToString() };
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}
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static uint[] FindKey (string arc_name, uint arc_key)
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{
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arc_name = Path.GetFileName (arc_name);
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var name_bytes = Encodings.cp932.GetBytes (arc_name);
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arc_key ^= name_bytes.ToUInt32 (0);
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return DatScheme.KnownSchemes.Values.FirstOrDefault (k => k[0] == arc_key);
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}
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static RepiScheme DatScheme = new RepiScheme { KnownSchemes = new Dictionary<string, uint[]>() };
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public override ResourceScheme Scheme
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{
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get { return DatScheme; }
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set { DatScheme = (RepiScheme)value; }
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}
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internal Dictionary<byte[], string> KnownNames { get { return s_known_file_names.Value; } }
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static Lazy<Dictionary<byte[], string>> s_known_file_names = new Lazy<Dictionary<byte[], string>> (ReadFileList);
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static Dictionary<byte[], string> ReadFileList ()
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{
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var dict = new Dictionary<byte[], string> (new Md5Comparer());
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try
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{
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var md5 = new MD5();
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FormatCatalog.Instance.ReadFileList (ListFileName, name => {
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var name_bytes = name.ToLowerShiftJis();
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var hash = md5.ComputeHash (name_bytes);
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dict[hash] = name;
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});
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}
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catch (Exception X)
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{
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System.Diagnostics.Trace.WriteLine (X.Message, "[RepiPack]");
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}
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return dict;
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}
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}
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internal class Md5Comparer : IEqualityComparer<byte[]>
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{
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public bool Equals (byte[] left, byte[] right)
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{
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if (left == null || right == null)
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return left == right;
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if (left.Length != right.Length)
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return false;
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for (int i = 0; i < left.Length; ++i)
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{
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if (left[i] != right[i])
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return false;
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}
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return true;
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}
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public int GetHashCode (byte[] key)
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{
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if (null == key)
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throw new ArgumentNullException ("key");
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if (key.Length < 16)
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throw new ArgumentException ("Invalid key length.", "key");
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var hash = key.ToInt32 (0);
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hash ^= key.ToInt32 (4);
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hash ^= key.ToInt32 (8);
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hash ^= key.ToInt32 (12);
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return hash;
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}
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}
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}
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