Narikiri Dungeon X

An attempt to create a patch for Narikiri Dungeon X (PSP).
https://docs.google.com/spreadsheets/d/1S1RwcAVeOqBEnIhfU2z7ZVff2C3vqwJ1tvNcy_qHZ6w/edit#gid=0

Hacker Note 1

Here is one interesting snip, might be useful for Narikiri Dungeon X...
If you want to know the file names of the data you extract, check this:

unsigned int hash(const char* string)
{
    unsigned int hash = 0;
    while(*string)
        hash = ((hash << 7) + hash) + (hash << 3) + *string++;
    return hash;
}

The files packed inside the .bin each have one its filenames... ...Except that they don't appear enywhere in the .bin, or any other file in the game.

Some system files do have their names in the ELF (all.dat). Those numbers are not random, they are the hash of the filename string, as per the above hash function.

For example, it's actually pretty trivial to "detach" this game, from Phantasia X, resulting in 2 independent ISO's.

It's just another ELF inside the game (top.prx?)

Then alpha-out the Phantasia X logo from the menu...and voila! The game's engine simply reloads the menu if you still try to access it.

Hacker Note 2

1. Besides the executable, all.dat is the only file of the game
2. Indices are in the executable, offset + size + name hash. So each entry should be 12-bytes, given each member 32-bits
3. Are the "sub-files" padded to start at an LBA? I think so, try searching for both (should take 2 minutes)
4. Just identify the padding in the big file to know where a subfile starts. Then search both offsets and sector in the exe. And you'll find the entry table.
5. Now the game doesn't store names anywhere, but rather generates them at runtime. Then hashes the generated names and looks it up in the index table to find offset and size. If you want to extract the right file names, you need to bruteforce the hashes from the index table with the function above (Hacker Note 1)

Hacker Note 3

The game engine statically links something like libc, so it uses sprintf to generate in runtime file names. For instance sprintf('levels/%d/enemy/%s/model.dat", 7, "bat"); Just a made up case. Then it would hash "levels/5/enemy/bat/model.dat" So theoretically if you know all the folders you can brute force faster Some system files, like the font, have file names directly stored in the execuable Those are easy to get, just run strings on the exe. Hash all, and take the ones existing in the entry table There is also the fact that the hash is a partially reversible function Meaning that a small change in the source string, causes a small change in the resulting hash With all this... the hashes could be all recovered

Hacker Note 4

Other aspects of the game are somewhat easy to hack, like the font It's just a set of gim files. You can't find them using the GE debugger though... Just find the font name in the exe, hash it and get the font from the big file with its offset and size Decode the gim and that's it

Hacker Note 5

Files with MSCF in the header are Microsoft CAB Files and can be extracted in Windows with EXPAND file.cab -F and packed with MAKECAB. For example, Chat files have .bin extension but can be extracted like a CAB file. Furthermore, after extract chat file, the resulting .dat file is a PAK3 file that can be extracted with pakcomposer.

Hacker Note 6

Re-pack scenario/script CAB files with the following:
makecab /D CompressionType=LZX /D CompressionMemory=15 /D ReservePerCabinetSize=8 ar.dat cab.cab

While not required, update CAB identity to 4392. Do this by hex editing CAB file at 0x20 and 0x21 from 00 00 to 28 11.

Hacker Note 6

looks like tss header starts with TSS (of course)
there's some kind of start 0x04 and end 0x14, probably to the bytecode script
pointer to the text block 0XOC
maybe size of the text block 0x18
then you just have to parse the bytecode script looking for stuff, there might be differences across games if they changed it between games
from the notes here, 0x0100A304 is a pointer table (?)
0x40002004 is a "name array", whatever that means
0x00008202 is a direct string
0x10000C04 is some kind of skit thing
0x40000C04 is a different type of skit thing
0x00002004 is some other kind of pointer table
you could reverse engineer the entire bytecode to be able to compile your own event scripts
but imo it's too much work, just look for commands related to text
and leave the byte script alone, edit only pointers and text

Links

• https://talesofnaridanx.weebly.com/downloads.html
• https://www.youtube.com/user/Crevox/videos
• http://www.mediafire.com/file/g83m35bh2ju746s/top_patch_v012.rar/file

Credits

• Thanks to Kajitani-Eizan for some hacker notes
• Thanks to Sky for donating resources to get started
• Thanks to crevox for permission to use their menu patch
• Thanks to kevassa for permission to use their English translation script