GARbro-mirror/ArcFormats/ArcNexas.cs

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//! \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)
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{
var name = Binary.GetCString (index, offset, 0x40);
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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;
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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 || null == pent || !pent.IsPacked)
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return input;
switch (pac.PackType)
{
case Compression.Lzss:
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using (input)
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using (var reader = new LzssReader (input, (int)pent.Size, (int)pent.UnpackedSize))
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{
reader.Unpack();
return new MemoryStream (reader.Data, false);
}
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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();
}
}
}