GARbro-mirror/ArcFormats/NekoSDK/ArcPAK.cs

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//! \file ArcPAK.cs
//! \date Thu Sep 29 15:17:42 2016
//! \brief NekoSDK NEKOPACK 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.IO;
using GameRes.Compression;
using GameRes.Utility;
namespace GameRes.Formats.NekoSDK
{
[Export(typeof(ArchiveFormat))]
public class PakOpener : ArchiveFormat
{
public override string Tag { get { return "NEKOPACK/4"; } }
public override string Description { get { return "NekoSDK engine resource archive"; } }
public override uint Signature { get { return 0x4F4B454E; } } // 'NEKOPACK'
public override bool IsHierarchic { get { return true; } }
public override bool CanWrite { get { return false; } }
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public PakOpener ()
{
Extensions = new string[] { "pak" };
}
public override ArcFile TryOpen (ArcView file)
{
if (!file.View.AsciiEqual (0, "NEKOPACK4"))
return null;
int version = file.View.ReadByte (9);
uint index_offset, index_end;
if ('A' == version)
{
index_offset = 0xE;
index_end = index_offset + file.View.ReadUInt32 (0xA);
}
else if ('S' == version)
{
index_offset = 0xA;
index_end = index_offset + file.View.ReadUInt32 (0xA) + 12;
}
else
{
return null;
}
var dir = new List<Entry>();
var name_buffer = new byte[0x100];
while (index_offset < index_end)
{
uint name_length = file.View.ReadUInt32 (index_offset);
index_offset += 4;
if (0 == name_length)
break;
if (name_length > name_buffer.Length)
return null;
file.View.Read (index_offset, name_buffer, 0, name_length);
index_offset += name_length;
int key = 0;
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for (uint i = 0; i < name_length; ++i)
key += (sbyte)name_buffer[i];
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var name = Binary.GetCString (name_buffer, 0, (int)name_length);
var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
entry.Offset = file.View.ReadUInt32 (index_offset) ^ (uint)key;
entry.Size = file.View.ReadUInt32 (index_offset+4) ^ (uint)key;
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if (!entry.CheckPlacement (file.MaxOffset))
return null;
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if (name.EndsWith (".alp", StringComparison.InvariantCultureIgnoreCase))
entry.Type = "";
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dir.Add (entry);
index_offset += 8;
}
if (0 == dir.Count)
return null;
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
uint key = entry.Size / 8 + 0x22;
var header = new byte[Math.Min (4, entry.Size)];
arc.File.View.Read (entry.Offset, header, 0, (uint)header.Length);
for (int i = 0; i < header.Length; ++i)
{
header[i] ^= (byte)key;
key <<= 3;
}
var pent = entry as PackedEntry;
if (null != pent && !pent.IsPacked && entry.Size >= 8)
{
pent.IsPacked = true;
pent.UnpackedSize = arc.File.View.ReadUInt32 (entry.Offset+entry.Size-4);
}
Stream input;
if (header.Length == entry.Size)
{
input = new MemoryStream (header);
}
else
{
input = arc.File.CreateStream (entry.Offset+4, entry.Size-8);
input = new PrefixStream (header, input);
}
return new ZLibStream (input, CompressionMode.Decompress);
}
}
}