ZenHAX

Is there a way to extract these? I'm looking to extract the files from Dogbyte Games' games. On iOS, it comes in "XPK" file format. On android, it's an obb file. They have the magic of "XPAK". Hmm... I can't find anything about this file. I was able to extract using offzip but I don't know what to do with the extracted files afterwards.
Sample: (Offroad Legends, iOS) https://www.mediafire.com/file/4xi26ah3 ... a.xpk/file

Data is encrypted

Oh. How do I decrypt it?

data xored by 0xAC54DF34 and compressed by Brotli

nice, what coding is that?
wtf me I posted that on "zenhax", home of quickbms.
are you still working on it?

Currently no. I'm busy with my main job .. I can look it in next weekends. Maybe someone else can take a look in more detail about this format

DEV INFO
So. There are 2 types of archives:

xor key > 0xAC54DF34 (2891243316u)

[HEADER V0 + V1]

struct XPAKHeader
{
   uint32_t   dwMagic;
   uint32_t   dwVersion; // 0 / 1 (LZMA)
   uint32_t   dwArchiveSize;
   byte   lpMD5[16]; // only present in versions above 0
   byte   lpLZMAProps[5]; // 4 bytes xored
   uint32_t dwTableZSize; // compressed size of table (xored)
};

[TABLE V0 + V1] (first dword is files count)

struct XPAKTable
{
   uint32_t   dwFileNameLength;
   byte   lpFileName[dwFileNameLength];
   uint32_t   dwFileZSize;
   byte   bFlag; // if value > 3 = data is compressed
};

[HEADER V2]

struct XPAKHeader
{
   uint32_t   dwMagic;
   uint32_t   dwVersion; // 2 (Brotli)
   uint32_t   dwArchiveSize;
   byte   lpMD5[16];
   uint32_t dwZero;
   uint32_t dwTableZSize; // compressed size of table (xored)
};

[TABLE V2] (first dword is files count)

struct XPAKTable
{
   uint32_t   dwFileNameLength;
   byte   lpFileName[dwFileNameLength];
   uint32_t   dwFileZSize;
   byte   bFlag; // flag & 0x40 != 0
};

[DECRYPTION]

void obfuscate(void *lpBuffer, int dwSize)
{
  signed int i; // r3@1
  int count; // r2@1 MAPDST

  i = 0;
  count = dwSize / 4;
  if ( count >= 4 )
    count = 4;
  while ( i < count )
  {
    ++i;
    *(DWORD *)lpBuffer ^= 0xAC54DF34;
    lpBuffer = (char *)lpBuffer + 4;
  }
}

Edited: Done

Done. I must admit, I could not implement a script for QuickBMS so I made batch tool for unpack on C#

[Usage]
    DB.XPAK.Unpacker <m_File> <m_OutDirectory>

[Examples]
    DB.XPAK.Unpacker D:\main.33.com.dogbytegames.zombiesafari.obb D:\Unpacked

Supported V0, V1 and V2 archives. Unpack Only!

If someone needs a packer, then I attach the source code (yeah, I'm a lazy ass ¯\_(ツ)_/¯ )

Thanks! Wow, a lot of info! Works great on Offroad Legends iOS. Found out the PNGs that are actually not PNGs, they're actually PVR textures. Here's an example of Rainbow.

Edit: Would be amazing if I can convert the models. They come in two formats, H3D and GEO. The H3D file looks to be an XML of some sort. The GEO file is not ASCII, and it has the MAGIC of "H3DG".
Another edit: They appear to be Horde3D model files.

Yup. Tool works on all the games from this company of those that I could find.

ALERT! I'm trying to extract the XPK from version 1.0 of Offroad Legends but I get this:
[ERROR]: Unsupported version > 0 < of XPAK archive file!
Can you look into it ?
H e r e : https://www.mediafire.com/file/77rmb8xv ... 9.xpk/file

Added V0 type

Thanks, I was trying to get the old Wheely before it turned into a UAZ, for some reason.

Well done Ekey.

I tried to make a quickbms script based on the source code of the tool (good occasion to spot bugs in my quickbms beta):
http://aluigi.org/bms/dogbyte_xpk.bms

That does the job well too.

I have finished my Horde3D Engine (v5;v6; Offroad Legends; Offroad Legends 2) *.GEO/*.SCENE.XML/*.MATERIAL.XML or *.GEO/*.H3D loader module and I have released the following programs as web updates:

- 3D Object Converter v7.047 (Windows)
- i3DConverter v3.905 (macOS)
- i3DConverter v1.905 (Linux)

How to get the 3D Object Converter v7.047:
Download the 3D Object Converter from http://3doc.i3dconverter.com and install it or download and use the portable version.
After it just use the Help/Check for updates... function to get the v7.047.

How to get the i3DConverter v3.905 macOS:
Download the i3DConverter from http://www.i3dconverter.com and install it.
After it just use the Help/Check for updates... function to get the v3.905.

How to get the i3DConverter v1.905 Linux:
Download the i3DConverter from http://www.i3dconverter.com and install it.
After it just use the Help/Check for updates... function to get the v1.905.