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NEKOPACK archives implementation.

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morkt 2015-03-13 04:48:45 +04:00
parent 6c3e1ed433
commit 9b4dd096e7
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1
ArcFormats/ArcFormats.csproj
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@ -75,6 +75,7 @@
<Compile Include="ArcLST.cs" />
<Compile Include="ArcMajiro.cs" />
<Compile Include="ArcMGPK.cs" />
<Compile Include="ArcNEKO.cs" />
<Compile Include="ArcNitro.cs" />
<Compile Include="ArcNPA.cs" />
<Compile Include="ArcNSA.cs" />

194
ArcFormats/ArcNEKO.cs Normal file
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@ -0,0 +1,194 @@
//! \file ArcNEKO.cs
//! \date Fri Mar 13 02:27:53 2015
//! \brief Nekopack archive format 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.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using System.Linq;
using GameRes.Utility;
namespace GameRes.Formats.Neko
{
public class NekoArchive : ArcFile
{
public uint Key { get; private set; }
public NekoArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, uint key)
: base (arc, impl, dir)
{
Key = key;
}
}
[Export(typeof(ArchiveFormat))]
public class PakOpener : ArchiveFormat
{
public override string Tag { get { return "NEKO"; } }
public override string Description { get { return "NekoPack resource archive"; } }
public override uint Signature { get { return 0x4f4b454e; } } // "NEKO"
public override bool IsHierarchic { get { return false; } }
public override bool CanCreate { get { return false; } }
public PakOpener ()
{
Extensions = new string[] { "dat" };
}
public override ArcFile TryOpen (ArcView file)
{
if (!file.View.AsciiEqual (4, "PACK"))
return null;
uint id = file.View.ReadUInt32 (8);
int length;
byte[] index = ReadBlock (file.View, id, 0x10, out length);
int total = 0;
long offset = 0x18 + length;
var dir = new List<Entry>();
int index_pos = 0;
for (int remaining = length; remaining > 0;)
{
int count = LittleEndian.ToInt32 (index, index_pos+4);
if (count <= 0 || count > remaining/8-1)
return null;
total += count;
dir.Capacity = total;
index_pos += 8;
for (int j = 0; j < count; ++j)
{
var entry = new Entry
{ Offset = offset, Size = LittleEndian.ToUInt32 (index, index_pos+4) };
if (!entry.CheckPlacement (file.MaxOffset))
return null;
index_pos += 8;
offset += entry.Size + 8;
dir.Add (entry);
}
remaining -= 8 + count * 8;
}
int i = 0;
byte[] buffer = new byte[0x10];
foreach (var entry in dir)
{
file.View.Read (entry.Offset, buffer, 0, 0x10);
uint hash = LittleEndian.ToUInt32 (buffer, 0);
if (0 != hash)
{
ulong key = KeyFromHash (hash);
Decrypt (key, buffer, 8, 8);
}
uint signature = LittleEndian.ToUInt32 (buffer, 8);
var res = FormatCatalog.Instance.LookupSignature (signature);
string ext = "";
if (res.Any())
{
ext = res.First().Extensions.First();
entry.Type = res.First().Type;
}
else if (0x474e4d8a == signature)
ext = "mng";
if (!string.IsNullOrEmpty (ext))
entry.Name = string.Format ("{0:D4}.{1}", i, ext);
else
entry.Name = i.ToString ("D4");
++i;
}
return new NekoArchive (file, this, dir, id);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var pak = arc as NekoArchive;
if (null == pak)
return arc.File.CreateStream (entry.Offset, entry.Size);
int length;
var data = ReadBlock (arc.File.View, pak.Key, entry.Offset, out length);
return new MemoryStream (data, false);
}
static ulong KeyFromHash (uint hash)
{
uint v2 = hash ^ (hash + 1566083941u);
uint v3 = v2 ^ (hash - 899497514u);
ulong result = v3 ^ (v2 - 1894007588u);
return result | (result ^ (v3 + 1812433253u)) << 32;
}
static uint CalcParity (uint a1, uint a2)
{
uint v1 = (a2 ^ ((a2 ^ ((a2 ^ ((a2 ^ a1) + 1566083941u)) - 899497514u)) - 1894007588u)) + 1812433253u;
int v2 = (int)(((a2 ^ ((a2 ^ a1) + 1566083941u)) - 899497514u) >> 27);
return v1 << v2 | v1 >> (32-v2);
}
static ulong Decrypt (ulong key, byte[] buf, int offset, int length)
{
unsafe
{
fixed (byte* data = buf)
{
ulong* first = (ulong*)(data + offset);
ulong* last = first + length/8;
while (first != last)
{
ulong v = *first ^ key;
key = _m_paddw (key, v);
*first++ = v;
}
return key;
}
}
}
static ulong _m_paddw (ulong x, ulong y)
{
ulong mask = 0xffff;
ulong r = ((x & mask) + (y & mask)) & mask;
mask <<= 16;
r |= ((x & mask) + (y & mask)) & mask;
mask <<= 16;
r |= ((x & mask) + (y & mask)) & mask;
mask <<= 16;
r |= ((x & mask) + (y & mask)) & mask;
return r;
}
static byte[] ReadBlock (ArcView.Frame view, uint id, long offset, out int length)
{
uint hash = view.ReadUInt32 (offset);
length = view.ReadInt32 (offset+4);
int aligned_size = (length+7) & ~7;
byte[] buffer = new byte[aligned_size];
view.Read (offset+8, buffer, 0, (uint)length);
if (0 != hash)
{
ulong key = KeyFromHash (hash);
Decrypt (key, buffer, 0, aligned_size);
}
return buffer;
}
}
}