GARbro-mirror/ArcFormats/Ivory/ArcPK.cs

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//! \file ArcPK.cs
//! \date Mon Sep 12 01:39:49 2016
//! \brief 'fPK' 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 GameRes.Utility;
namespace GameRes.Formats.Ivory
{
internal class PkEntry : Entry
{
public int NameOffset;
}
[Export(typeof(ArchiveFormat))]
public class PakOpener : ArchiveFormat
{
public override string Tag { get { return "PK/IVORY"; } }
public override string Description { get { return "Ivory resource archive"; } }
public override uint Signature { get { return 0x204B5066; } } // 'fPK '
public override bool IsHierarchic { get { return true; } }
public override bool CanWrite { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
if (file.MaxOffset != file.View.ReadUInt32 (4))
return null;
long base_offset = 0;
List<Entry> dir = null;
bool got_names = false;
long offset = 8;
while (offset < file.MaxOffset)
{
var id = new AsciiString (file.View.ReadBytes (offset, 4));
uint section_size = file.View.ReadUInt32 (offset+4);
if (0 == section_size)
return null;
uint header_size = file.View.ReadUInt32 (offset+8);
if ("cLST" == id)
{
int count = file.View.ReadInt32 (offset+0x10);
if (!IsSaneCount (count))
return null;
uint key = file.View.ReadUInt32 (offset+0x14);
var clst = file.View.ReadBytes (offset+header_size, section_size - header_size);
Decrypt (clst, key);
dir = new List<Entry> (count);
int index_offset = 0;
for (int i = 0; i < count; ++i)
{
var entry = new PkEntry {
NameOffset = LittleEndian.ToInt32 (clst, index_offset),
Offset = LittleEndian.ToUInt32 (clst, index_offset+4),
Size = LittleEndian.ToUInt32 (clst, index_offset+8),
};
dir.Add (entry);
index_offset += 12;
}
}
else if ("cNAM" == id)
{
if (null == dir)
return null;
uint key = file.View.ReadUInt32 (offset+0x10);
var cnam = file.View.ReadBytes (offset+header_size, section_size - header_size);
Decrypt (cnam, key);
foreach (PkEntry entry in dir)
{
var name = Binary.GetCString (cnam, entry.NameOffset);
entry.Name = name;
if (name.HasExtension (".px"))
entry.Type = "audio";
else
entry.Type = FormatCatalog.Instance.GetTypeFromName (name);
}
got_names = true;
}
else if ("cDAT" == id)
{
base_offset = offset + header_size;
}
offset += section_size;
}
if (null == dir || !got_names || 0 == base_offset)
return null;
foreach (var entry in dir)
{
entry.Offset += base_offset;
if (!entry.CheckPlacement (file.MaxOffset))
return null;
}
return new ArcFile (file, this, dir);
}
internal static void Decrypt (byte[] data, uint seed)
{
int length = data.Length / 4;
if (0 == length)
return;
var ctl = new ushort[32];
var key = new uint[32];
for (int i = 0; i < 32; ++i)
{
uint code = 0;
uint k = seed;
for (int j = 0; j < 16; ++j)
{
code = (k ^ (k >> 1)) << 15 | (code & 0xFFFF) >> 1;
k >>= 2;
}
key[i] = seed;
ctl[i] = (ushort)code;
seed = Binary.RotL (seed, 1);
}
unsafe
{
fixed (byte* data8 = data)
{
uint* data32 = (uint*)data8;
for (int i = 0; i < length; ++i)
{
uint s = *data32;
ushort code = ctl[i & 0x1F];
uint d = 0;
uint v3 = 3;
uint v2 = 2;
uint v1 = 1;
for (int j = 0; j < 16; ++j)
{
if (0 != (code & 1))
{
d |= (s & v1) << 1 | (s >> 1) & (v2 >> 1);
}
else
{
d |= s & v3;
}
code >>= 1;
v3 <<= 2;
v2 <<= 2;
v1 <<= 2;
}
*data32++ = d ^ key[i & 0x1F];
}
}
}
}
}
}