GARbro-mirror/ArcFormats/LiveMaker/ArcVF.cs

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//! \file ArcVF.cs
//! \date Wed Jun 08 00:27:36 2016
//! \brief LiveMaker resource archive.
//
// Copyright (C) 2016 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.Diagnostics;
using System.IO;
using GameRes.Compression;
namespace GameRes.Formats.LiveMaker
{
[Export(typeof(ArchiveFormat))]
public class VffOpener : ArchiveFormat
{
public override string Tag { get { return "DAT/vf"; } }
public override string Description { get { return "LiveMaker resource archive"; } }
public override uint Signature { get { return 0x666676; } } // 'vff'
public override bool IsHierarchic { get { return true; } }
public override bool CanWrite { get { return false; } }
public VffOpener ()
{
Extensions = new string[] { "dat" };
Signatures = new uint[] { 0x666676, 0 };
}
public override ArcFile TryOpen (ArcView file)
{
uint base_offset = 0;
ArcView index_file = file;
ArcView extra_file = null;
try
{
// possible filesystem structure:
// game.dat -- main archive body
// game.001 -- [optional] extra part
// game.ext -- [optional] separate index (could be included into the main body)
uint signature = index_file.View.ReadUInt32 (0);
if (file.Name.EndsWith (".exe", StringComparison.InvariantCultureIgnoreCase)
&& (0x5A4D == (signature & 0xFFFF))) // 'MZ'
{
base_offset = SkipExeData (index_file);
signature = index_file.View.ReadUInt32 (base_offset);
}
else if (!file.Name.EndsWith (".dat", StringComparison.InvariantCultureIgnoreCase))
{
return null;
}
else if (0x666676 != signature)
{
var ext_filename = Path.ChangeExtension (file.Name, ".ext");
if (!VFS.FileExists (ext_filename))
return null;
index_file = VFS.OpenView (ext_filename);
signature = index_file.View.ReadUInt32 (0);
}
if (0x666676 != signature)
return null;
int count = index_file.View.ReadInt32 (base_offset+6);
if (!IsSaneCount (count))
return null;
var dir = ReadIndex (index_file, base_offset, count);
if (null == dir)
return null;
long max_offset = file.MaxOffset;
for (int i = 0; i < dir.Count; ++i)
{
if (!dir[i].CheckPlacement (max_offset))
{
if (extra_file != null)
{
// remove entries that don't fit into game.dat+game.001
int discard = dir.Count - i;
Trace.WriteLine (string.Format ("{0} entries didn't fit and were discarded", discard), "[vff]");
dir.RemoveRange (i, discard);
break;
}
var extra_filename = Path.ChangeExtension (file.Name, ".001");
if (!VFS.FileExists (extra_filename))
return null;
extra_file = VFS.OpenView (extra_filename);
max_offset += extra_file.MaxOffset;
if (!dir[i].CheckPlacement (max_offset))
return null;
}
}
if (null == extra_file)
return new ArcFile (file, this, dir);
return new VffArchive (file, this, dir, extra_file);
}
catch
{
if (extra_file != null)
extra_file.Dispose();
throw;
}
finally
{
if (index_file != file)
index_file.Dispose();
}
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var vff = arc as VffArchive;
Stream input = null;
if (vff != null)
input = vff.OpenStream (entry);
else
input = arc.File.CreateStream (entry.Offset, entry.Size);
var pent = entry as PackedEntry;
if (pent != null && pent.IsPacked)
return new ZLibStream (input, CompressionMode.Decompress);
else
return input;
}
List<Entry> ReadIndex (ArcView file, uint base_offset, int count)
{
uint index_offset = base_offset+0xA;
var name_buffer = new byte[0x100];
var rnd = new TpRandom (0x75D6EE39u);
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
uint name_length = file.View.ReadUInt32 (index_offset);
index_offset += 4;
if (0 == name_length || name_length > name_buffer.Length)
return null;
if (name_length != file.View.Read (index_offset, name_buffer, 0, name_length))
return null;
index_offset += name_length;
var name = DecryptName (name_buffer, (int)name_length, rnd);
dir.Add (FormatCatalog.Instance.Create<PackedEntry> (name));
}
rnd.Reset();
long offset = base_offset + (file.View.ReadInt64 (index_offset) ^ (int)rnd.GetRand32());
foreach (var entry in dir)
{
index_offset += 8;
long next_offset = base_offset + (file.View.ReadInt64 (index_offset) ^ (int)rnd.GetRand32());
entry.Offset = offset;
entry.Size = (uint)(next_offset - offset);
offset = next_offset;
}
index_offset += 8;
foreach (PackedEntry entry in dir)
{
entry.IsPacked = 0 == file.View.ReadByte (index_offset++);
}
return dir;
}
string DecryptName (byte[] name_buf, int name_length, TpRandom key)
{
for (int i = 0; i < name_length; ++i)
{
name_buf[i] ^= (byte)key.GetRand32();
}
return Encodings.cp932.GetString (name_buf, 0, name_length);
}
uint SkipExeData (ArcView file)
{
var exe = new ExeFile (file);
return (uint)exe.Overlay.Offset;
}
}
internal class TpRandom
{
uint m_seed;
uint m_current;
public TpRandom (uint seed)
{
m_seed = seed;
m_current = 0;
}
public uint GetRand32 ()
{
m_current += m_current << 2;
m_current += m_seed;
return m_current;
}
public void Reset ()
{
m_current = 0;
}
}
internal class VffArchive : ArcFile
{
readonly ArcView ExtraFile;
public VffArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, ArcView extra_file)
: base (arc, impl, dir)
{
ExtraFile = extra_file;
}
internal Stream OpenStream (Entry entry)
{
if (entry.Offset < File.MaxOffset && entry.Offset+entry.Size > File.MaxOffset)
{
var first_part = File.View.ReadBytes (entry.Offset, entry.Size);
var second_part = ExtraFile.CreateStream (0, entry.Size - (uint)first_part.Length);
return new PrefixStream (first_part, second_part);
}
else if (entry.Offset >= File.MaxOffset)
{
return ExtraFile.CreateStream (entry.Offset, entry.Size);
}
else
return File.CreateStream (entry.Offset, entry.Size);
}
bool _vff_disposed = false;
protected override void Dispose (bool disposing)
{
if (!_vff_disposed)
{
if (disposing && ExtraFile != null)
ExtraFile.Dispose();
_vff_disposed = true;
}
base.Dispose (disposing);
}
}
}