2015-04-10 06:33:00 +04:00

244 lines
8.2 KiB
C#

//! \file ArcNexas.cs
//! \date Sat Mar 14 18:03:04 2015
//! \brief NeXAS enginge resource archives implementation.
//
// Copyright (C) 2015 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.IO;
using System.Linq;
using System.Text;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using GameRes.Formats.Strings;
using GameRes.Utility;
using ZLibNet;
namespace GameRes.Formats.NeXAS
{
public enum Compression
{
None,
Lzss,
Huffman,
Deflate,
DeflateOrNone,
}
public class PacArchive : ArcFile
{
public readonly Compression PackType;
public PacArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, Compression type)
: base (arc, impl, dir)
{
PackType = type;
}
}
[Export(typeof(ArchiveFormat))]
public class PacOpener : ArchiveFormat
{
public override string Tag { get { return "PAC"; } }
public override string Description { get { return "NeXAS engine resource archive"; } }
public override uint Signature { get { return 0x00434150; } } // 'PAC\000'
public override bool IsHierarchic { get { return false; } }
public override bool CanCreate { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
int count = file.View.ReadInt32 (4);
if (count <= 0 || count > 0xfffff)
return null;
int pack_type = file.View.ReadInt32 (8);
uint index_size = file.View.ReadUInt32 (file.MaxOffset-4);
if (index_size >= file.MaxOffset)
return null;
byte[] index_packed = new byte[index_size];
file.View.Read (file.MaxOffset-4-index_size, index_packed, 0, index_size);
for (int i = 0; i < index_packed.Length; ++i)
index_packed[i] = (byte)~index_packed[i];
var index = HuffmanDecode (index_packed, count*0x4c);
var dir = new List<Entry> (count);
int offset = 0;
for (int i = 0; i < count; ++i, offset += 0x4c)
{
int name_length = 0;
while (name_length < 0x40 && 0 != index[offset+name_length])
name_length++;
if (0 == name_length)
continue;
var name = Encodings.cp932.GetString (index, offset, name_length);
var entry = new PackedEntry
{
Name = name,
Type = FormatCatalog.Instance.GetTypeFromName (name),
Offset = LittleEndian.ToUInt32 (index, offset+0x40),
UnpackedSize = LittleEndian.ToUInt32 (index, offset+0x44),
Size = LittleEndian.ToUInt32 (index, offset+0x48),
};
if (!entry.CheckPlacement (file.MaxOffset))
return null;
entry.IsPacked = pack_type != 0 && entry.UnpackedSize != entry.Size;
dir.Add (entry);
}
if (0 == pack_type)
return new ArcFile (file, this, dir);
return new PacArchive (file, this, dir, (Compression)pack_type);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var input = arc.File.CreateStream (entry.Offset, entry.Size);
var pac = arc as PacArchive;
var pent = entry as PackedEntry;
if (null == pac || Compression.None == pac.PackType ||
null == pent || pent.Size == pent.UnpackedSize)
return input;
switch (pac.PackType)
{
case Compression.Lzss:
using (input)
using (var reader = new LzssReader (input, (int)pent.Size, (int)pent.UnpackedSize))
{
reader.Unpack();
return new MemoryStream (reader.Data, false);
}
case Compression.Huffman:
using (input)
{
var packed = new byte[entry.Size];
input.Read (packed, 0, packed.Length);
var unpacked = HuffmanDecode (packed, (int)pent.UnpackedSize);
return new MemoryStream (unpacked, 0, (int)pent.UnpackedSize, false);
}
case Compression.Deflate:
default:
return new ZLibStream (input, CompressionMode.Decompress);
}
}
static private byte[] HuffmanDecode (byte[] packed, int unpacked_size)
{
var dst = new byte[unpacked_size];
var decoder = new HuffmanDecoder (packed, dst);
return decoder.Unpack();
}
}
internal class HuffmanDecoder
{
byte[] m_src;
byte[] m_dst;
ushort[] lhs = new ushort[512];
ushort[] rhs = new ushort[512];
ushort t1032 = 256;
int t0;
int remaining;
int t8;
int t12;
public HuffmanDecoder (byte[] src, byte[] dst)
{
m_src = src;
m_dst = dst;
t0 = 0;
remaining = src.Length;
t8 = 0;
t12 = 0;
}
public byte[] Unpack ()
{
int a2 = 0;
t1032 = 256;
ushort v3 = sub_401540();
ushort v13 = v3; // [sp+0h] [bp-4h]@1
while (a2 < m_dst.Length)
{
ushort v6 = v3;
if ( v6 >= 0x100u )
{
do
{
while ( 0 == t8 )
{
int v8 = m_src[t0++];
int v9 = t12;
t8 += 8;
--remaining;
t12 = v8 | (v9 << 8);
}
int v10 = t12;
int v11 = --t8;
uint v12 = (uint)t12;
t12 = v10 & ~(-1 << v11);
if ( 0 != (((-1 << v11) & v12) >> v11) )
v6 = rhs[v6];
else
v6 = lhs[v6];
}
while ( v6 >= 0x100u );
v3 = v13;
}
m_dst[a2++] = (byte)v6;
}
return m_dst;
}
ushort sub_401540()
{
if ( 0 != GetBits (1) )
{
ushort v4 = t1032++;
lhs[v4] = sub_401540();
rhs[v4] = sub_401540();
return v4;
}
else
{
return (ushort)GetBits (8);
}
}
uint GetBits (int n)
{
while ( n > t8 )
{
int v4 = m_src[t0++];
--remaining;
t12 = v4 | (t12 << 8);
t8 += 8;
}
int v7 = t12;
uint v8 = (uint)t12;
t8 -= n;
t12 = v7 & ~(-1 << t8);
return (uint)(((-1 << t8) & v8) >> t8);
}
}
}