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//! \file ArcQLIE.cs
//! \date Mon Jun 15 04:03:18 2015
//! \brief QLIE engine 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.IO;
using System.Text;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System;
using GameRes.Utility;
namespace GameRes.Formats.Qlie
{
internal class QlieEntry : PackedEntry
{
public bool IsEncrypted;
public uint Hash;
public uint Key;
}
[Export(typeof(ArchiveFormat))]
public class PackOpener : ArchiveFormat
{
public override string Tag { get { return "PACK/QLIE"; } }
public override string Description { get { return "QLIE engine resource archive"; } }
public override uint Signature { get { return 0; } }
public override bool IsHierarchic { get { return true; } }
public override bool CanCreate { get { return false; } }
public PackOpener ()
{
Extensions = new string [] { "pack" };
}
public override ArcFile TryOpen (ArcView file)
{
if (file.MaxOffset <= 0x1c)
return null;
long index_offset = file.MaxOffset - 0x1c;
if (!file.View.AsciiEqual (index_offset, "FilePackVer")
|| !file.View.AsciiEqual (index_offset+0xC, ".0"))
return null;
int pack_version = file.View.ReadByte (index_offset+0xB) - '0';
if (pack_version < 1 || pack_version > 3)
throw new NotSupportedException ("Not supported QLIE archive version");
int count = file.View.ReadInt32 (index_offset+0x10);
if (!IsSaneCount (count))
return null;
index_offset = file.View.ReadInt64 (index_offset+0x14);
if (index_offset < 0 || index_offset >= file.MaxOffset)
return null;
uint pack_key;
if (3 == pack_version)
{
var key_data = new byte[0x100];
file.View.Read (file.MaxOffset-0x41C, key_data, 0, 0x100);
pack_key = GenerateKey (key_data) & 0x0FFFFFFFu;
}
else
pack_key = 0xC4;
var name_buffer = new byte[0x100];
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
int name_length = file.View.ReadUInt16 (index_offset);
if (name_length > name_buffer.Length)
name_buffer = new byte[name_length];
if (name_length != file.View.Read (index_offset+2, name_buffer, 0, (uint)name_length))
return null;
int key = name_length + ((int)pack_key ^ 0x3e);
for (int k = 0; k < name_length; ++k)
name_buffer[k] ^= (byte)(((k + 1) ^ key) + k + 1);
string name = Encodings.cp932.GetString (name_buffer, 0, name_length);
var entry = FormatCatalog.Instance.Create<QlieEntry> (name);
index_offset += 2 + name_length;
entry.Offset = file.View.ReadInt64 (index_offset);
entry.Size = file.View.ReadUInt32 (index_offset+8);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
entry.UnpackedSize = file.View.ReadUInt32 (index_offset+12);
entry.IsPacked = 0 != file.View.ReadInt32 (index_offset+0x10);
entry.IsEncrypted = 0 != file.View.ReadInt32 (index_offset+0x14);
entry.Hash = file.View.ReadUInt32 (index_offset+0x18);
if (3 == pack_version)
entry.Key = pack_key;
else
entry.Key = 0;
dir.Add (entry);
index_offset += 0x1c;
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var qent = entry as QlieEntry;
if (null == qent || (!qent.IsEncrypted && !qent.IsPacked))
return arc.File.CreateStream (entry.Offset, entry.Size);
var data = new byte[entry.Size];
if (entry.Size != arc.File.View.Read (entry.Offset, data, 0, entry.Size))
return arc.File.CreateStream (entry.Offset, entry.Size);
if (qent.IsEncrypted)
Decrypt (data, 0, data.Length, qent.Key);
if (qent.IsPacked)
{
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var unpacked = Decompress (data);
if (null != unpacked)
data = unpacked;
}
return new MemoryStream (data);
}
private void Decrypt (byte[] buffer, int offset, int length, uint key)
{
if (offset < 0)
throw new ArgumentOutOfRangeException ("offset");
if (length > buffer.Length || offset > buffer.Length - length)
throw new ArgumentOutOfRangeException ("length");
ulong hash = 0xA73C5F9DA73C5F9Dul;
ulong xor = ((uint)length + key) ^ 0xFEC9753Eu;
xor |= xor << 32;
unsafe
{
fixed (byte* raw = buffer)
{
ulong* encoded = (ulong*)(raw + offset);
for (int i = 0; i < length / 8; ++i)
{
hash = MMX.PAddD (hash, 0xCE24F523CE24F523ul) ^ xor;
xor = *encoded ^ hash;
*encoded++ = xor;
}
}
}
}
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internal static byte[] Decompress (byte[] input)
{
if (LittleEndian.ToUInt32 (input, 0) != 0xFF435031)
return null;
bool is_16bit = 0 != (input[4] & 1);
var node = new byte[2,256];
var child_node = new byte[256];
int output_length = LittleEndian.ToInt32 (input, 8);
var output = new byte[output_length];
int src = 12;
int dst = 0;
while (src < input.Length)
{
int i, k, count, index;
for (i = 0; i < 256; i++)
node[0,i] = (byte)i;
for (i = 0; i < 256; )
{
count = input[src++];
if (count > 127)
{
int step = count - 127;
i += step;
count = 0;
}
if (i > 255)
break;
count++;
for (k = 0; k < count; k++)
{
node[0,i] = input[src++];
if (node[0,i] != i)
node[1,i] = input[src++];
i++;
}
}
if (is_16bit)
{
count = LittleEndian.ToUInt16 (input, src);
src += 2;
}
else
{
count = LittleEndian.ToInt32 (input, src);
src += 4;
}
k = 0;
for (;;)
{
if (k > 0)
index = child_node[--k];
else
{
if (0 == count)
break;
count--;
index = input[src++];
}
if (node[0,index] == index)
output[dst++] = (byte)index;
else
{
child_node[k++] = node[1,index];
child_node[k++] = node[0,index];
}
}
}
if (dst != output.Length)
return null;
return output;
}
uint GenerateKey (byte[] key_data)
{
ulong hash = 0;
ulong key = 0;
unsafe
{
fixed (byte* data = key_data)
{
ulong* data64 = (ulong*)data;
for (int i = key_data.Length / 8; i > 0; --i)
{
hash = MMX.PAddW (hash, 0x0307030703070307);
key = MMX.PAddW (key, *data64++ ^ hash);
}
}
}
return (uint)(key ^ (key >> 32));
}
}
}