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327 lines
11 KiB
C#
327 lines
11 KiB
C#
//! \file ArcVF.cs
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//! \date Wed Jun 08 00:27:36 2016
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//! \brief LiveMaker resource archive.
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//
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// Copyright (C) 2016-2019 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.Diagnostics;
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using System.IO;
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using System.Linq;
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using GameRes.Compression;
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namespace GameRes.Formats.LiveMaker
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{
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[Export(typeof(ArchiveFormat))]
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public class VffOpener : ArchiveFormat
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{
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public override string Tag { get { return "DAT/vf"; } }
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public override string Description { get { return "LiveMaker resource archive"; } }
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public override uint Signature { get { return 0x666676; } } // 'vff'
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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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public VffOpener ()
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{
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Extensions = new string[] { "dat" };
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Signatures = new uint[] { 0x666676, 0 };
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}
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public override ArcFile TryOpen (ArcView file)
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{
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uint base_offset = 0;
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ArcView index_file = file;
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try
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{
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// possible filesystem structure:
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// game.dat -- main archive body
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// game.ext -- [optional] separate index (could be included into the main body)
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// game.001 -- [optional] extra parts
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// game.002
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// ...
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uint signature = index_file.View.ReadUInt32 (0);
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if (file.Name.HasExtension (".exe")
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&& (0x5A4D == (signature & 0xFFFF))) // 'MZ'
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{
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base_offset = SkipExeData (index_file);
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signature = index_file.View.ReadUInt32 (base_offset);
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}
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else if (!file.Name.HasExtension (".dat"))
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{
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return null;
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}
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else if (0x666676 != signature)
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{
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var ext_filename = Path.ChangeExtension (file.Name, ".ext");
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if (!VFS.FileExists (ext_filename))
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return null;
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index_file = VFS.OpenView (ext_filename);
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signature = index_file.View.ReadUInt32 (0);
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}
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if (0x666676 != signature)
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return null;
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int count = index_file.View.ReadInt32 (base_offset+6);
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if (!IsSaneCount (count))
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return null;
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var dir = ReadIndex (index_file, base_offset, count);
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if (null == dir)
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return null;
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long max_offset = file.MaxOffset;
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var parts = new List<ArcView>();
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try
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{
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for (int i = 1; i < 100; ++i)
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{
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var ext = string.Format (".{0:D3}", i);
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var part_filename = Path.ChangeExtension (file.Name, ext);
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if (!VFS.FileExists (part_filename))
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break;
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var arc_file = VFS.OpenView (part_filename);
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max_offset += arc_file.MaxOffset;
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parts.Add (arc_file);
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}
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}
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catch
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{
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foreach (var part in parts)
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part.Dispose();
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throw;
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}
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if (0 == parts.Count)
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return new ArcFile (file, this, dir);
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return new MultiFileArchive (file, this, dir, parts);
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}
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finally
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{
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if (index_file != file)
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index_file.Dispose();
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}
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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 vff = arc as MultiFileArchive;
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Stream input = null;
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if (vff != null)
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input = vff.OpenStream (entry);
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else
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input = arc.File.CreateStream (entry.Offset, entry.Size);
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var pent = entry as VfEntry;
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if (null == pent)
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return input;
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if (pent.IsScrambled)
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{
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byte[] data;
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using (input)
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{
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if (entry.Size <= 8)
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return Stream.Null;
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data = ReshuffleStream (input);
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}
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input = new BinMemoryStream (data, entry.Name);
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}
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if (pent.IsPacked)
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input = new ZLibStream (input, CompressionMode.Decompress);
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return input;
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}
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List<Entry> ReadIndex (ArcView file, uint base_offset, int count)
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{
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uint index_offset = base_offset+0xA;
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var name_buffer = new byte[0x100];
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var rnd = new TpRandom (0x75D6EE39u);
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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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uint name_length = file.View.ReadUInt32 (index_offset);
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index_offset += 4;
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if (0 == name_length || name_length > name_buffer.Length)
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return null;
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if (name_length != file.View.Read (index_offset, name_buffer, 0, name_length))
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return null;
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index_offset += name_length;
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var name = DecryptName (name_buffer, (int)name_length, rnd);
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dir.Add (Create<VfEntry> (name));
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}
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rnd.Reset();
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long offset = base_offset + (file.View.ReadInt64 (index_offset) ^ (int)rnd.GetRand32());
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foreach (var entry in dir)
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{
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index_offset += 8;
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long next_offset = base_offset + (file.View.ReadInt64 (index_offset) ^ (int)rnd.GetRand32());
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entry.Offset = offset;
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entry.Size = (uint)(next_offset - offset);
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offset = next_offset;
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}
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index_offset += 8;
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foreach (VfEntry entry in dir)
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{
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byte flags = file.View.ReadByte (index_offset++);
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entry.IsPacked = 0 == flags || 3 == flags;
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entry.IsScrambled = 2 == flags || 3 == flags;
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}
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return dir;
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}
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string DecryptName (byte[] name_buf, int name_length, TpRandom key)
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{
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for (int i = 0; i < name_length; ++i)
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{
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name_buf[i] ^= (byte)key.GetRand32();
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}
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return Encodings.cp932.GetString (name_buf, 0, name_length);
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}
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uint SkipExeData (ArcView file)
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{
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var exe = new ExeFile (file);
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return (uint)exe.Overlay.Offset;
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}
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byte[] ReshuffleStream (Stream input)
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{
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var header = new byte[8];
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input.Read (header, 0, 8);
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int chunk_size = header.ToInt32 (0);
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uint seed = header.ToUInt32 (4) ^ 0xF8EAu;
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int input_length = (int)input.Length - 8;
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var output = new byte[input_length];
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int count = (input_length - 1) / chunk_size + 1;
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int dst = 0;
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foreach (int i in RandomSequence (count, seed))
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{
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int position = i * chunk_size;
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input.Position = 8 + position;
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int length = Math.Min (chunk_size, input_length - position);
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input.Read (output, dst, length);
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dst += length;
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}
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return output;
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}
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static IEnumerable<int> RandomSequence (int count, uint seed)
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{
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var tp = new TpScramble (seed);
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var order = Enumerable.Range (0, count).ToList<int>();
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var seq = new int[order.Count];
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for (int i = 0; order.Count > 1; ++i)
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{
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int n = tp.GetInt32 (0, order.Count - 2);
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seq[order[n]] = i;
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order.RemoveAt (n);
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}
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seq[order[0]] = count - 1;
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return seq;
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}
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}
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internal class VfEntry : PackedEntry
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{
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public bool IsScrambled;
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}
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internal class TpRandom
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{
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uint m_seed;
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uint m_current;
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public TpRandom (uint seed)
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{
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m_seed = seed;
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m_current = 0;
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}
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public uint GetRand32 ()
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{
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m_current += m_current << 2;
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m_current += m_seed;
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return m_current;
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}
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public void Reset ()
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{
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m_current = 0;
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}
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}
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internal class TpScramble
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{
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uint[] m_state = new uint[5];
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const uint FactorA = 2111111111;
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const uint FactorB = 1492;
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const uint FactorC = 1776;
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const uint FactorD = 5115;
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public TpScramble (uint seed)
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{
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Init (seed);
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}
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public void Init (uint seed)
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{
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uint hash = seed != 0 ? seed : 0xFFFFFFFFu;
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for (int i = 0; i < 5; ++i)
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{
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hash ^= hash << 13;
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hash ^= hash >> 17;
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hash ^= hash << 5;
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m_state[i] = hash;
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}
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for (int i = 0; i < 19; ++i)
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{
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GetUInt32();
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}
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}
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public int GetInt32 (int first, int last)
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{
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var num = GetDouble();
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return (int)(first + (long)(num * (last - first + 1)));
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}
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double GetDouble ()
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{
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return (double)GetUInt32() / 0x100000000L;
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}
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uint GetUInt32 ()
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{
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ulong v = FactorA * (ulong)m_state[3]
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+ FactorB * (ulong)m_state[2]
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+ FactorC * (ulong)m_state[1]
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+ FactorD * (ulong)m_state[0] + m_state[4];
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m_state[3] = m_state[2];
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m_state[2] = m_state[1];
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m_state[1] = m_state[0];
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m_state[4] = (uint)(v >> 32);
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return m_state[0] = (uint)v;
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}
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}
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}
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