ROM Hack wonder boy ultimate collection rom extract from roms.zak

[yyoossk]

Is there any way to extract roms from roms.zak?

 

[switchhunter666]

I'll try

 

[yyoossk]

I'll try

thx!

 

[SmashMan4]

Sorry for the bump, but has there been any progress on this, I noticed the Ratalaika games that use emulation have this file, and I'm trying to figure out how to get the rom files.

 

[Pr3tty F1y]

Sorry for the bump, but has there been any progress on this, I noticed the Ratalaika games that use emulation have this file, and I'm trying to figure out how to get the rom files.

I don't have anything helpful to add, but the LICENSES.TXT file included with the game indicates these compression routines were used:
■lz4 (https://github.com/lz4/lz4)
■lz4hc (https://github.com/lz4/lz4)
■zlib (https://github.com/cloudflare/zlib)

 

[lordelan]

I'm highly interested in this too as the Ninja JajaMaru retro collection also has a roms.zak and I'm dying to get the GBC rom out of there.

 

[gdavies]

Is there a link to the file / game, I will happily have a go at getting the roms out

 

[SylverReZ]

Is there a link to the file / game, I will happily have a go at getting the roms out

Sharing links to ROMs are forbidden. They aren't even hard to find if you do a quick search.

 

[gdavies]

Sharing links to ROMs are forbidden. They aren't even hard to find if you do a quick search.

apologies and have found them, was been lazy but the extension file is an odd one to extract from thats for sure

 

[lordelan]

apologies and have found them, was been lazy but the extension file is an odd one to extract from thats for sure

Sent u a PM. Also, have you already tried these?

I don't have anything helpful to add, but the LICENSES.TXT file included with the game indicates these compression routines were used:
■lz4 (https://github.com/lz4/lz4)
■lz4hc (https://github.com/lz4/lz4)
■zlib (https://github.com/cloudflare/zlib)

 

[gdavies]

yeah they don't really touch it, I have been able to get the machine code out but just looking at other ways at the moment

 

[Pr3tty F1y]

The other problem is that I have zero coding skills and definitely don't know ARM64, but I can tinker.

So a disassembly of the EXEFS definitely references the file and most likely steps through the decompression. I just can't do anything with it:

And futher down inside that sub_7100201960 under the /roms and /roms.zak reference. It clearly deals with what happens if the roms.zak file is empty/has no compressed components. But like I said, I can read the text, but zero ability to make sense of what is actually going on:

 

[lordelan]

The other problem is that I have zero coding skills and definitely don't know ARM64, but I can tinker.

So a disassembly of the EXEFS definitely references the file and most likely steps through the decompression. I just can't do anything with it:

View attachment 357694

And futher down inside that sub_7100201960 under the /roms and /roms.zak reference. It clearly deals with what happens if the roms.zak file is empty/has no compressed components. But like I said, I can read the text, but zero ability to make sense of what is actually going on:
View attachment 357695

At least you're onto something there. Thx for the effort so far!

 

[gdavies]

Ok turns out Scummv tools attempts to extract the files but then seems to revert and stop the process

 

[lordelan]

Isn't there a way (via sys-ftpd or something like that) to access the Switch's memory while the game (temporary) extracts this file in order to access the rom? Or to access the RAM?

 

[gdavies]

That is probably a better way to look at it, just wondering if the switch locks of certain access when a gam is in play, but when I am on my next day off I will have a look into doing it that way

 

[lordelan]

That is probably a better way to look at it, just wondering if the switch locks of certain access when a gam is in play, but when I am on my next day off I will have a look into doing it that way

Nice. Wish you luck!

 

[Pr3tty F1y]

Nice. Wish you luck!

The ROMs can be extracted from RAM in an emulator like Yuzu or Ryujinx, but some exhibit significant graphical corruption PC emulators for the respective systems. Therefore, it's difficult to say if RAM dumps are the same as the raw ROMs in the zak archive or, due to how they are stored in memory, that they're non-original.

To me, this means decompressing the zak archive is the only way to be sure what files were originally packed to see if they are compatible with physical hardware or if they have been somehow modified to run on the Switch emulator but ended up being non-hardware compatible.

 

[gdavies]

The ROMs can be extracted from RAM in an emulator like Yuzu or Ryujinx, but some exhibit significant graphical corruption PC emulators for the respective systems. Therefore, it's difficult to say if RAM dumps are the same as the raw ROMs in the zak archive or, due to how they are stored in memory, that they're non-original.

To me, this means decompressing the zak archive is the only way to be sure what files were originally packed to see if they are compatible with physical hardware or if they have been somehow modified to run on the Switch emulator but ended up being non-hardware compatible.

I found extracting the rooms from pc emulators don’t like to be installed afterwards as they say the room is corrupt but maybe worth a shot as I couldn‘t find a way of decompressing them when I tried yesterday, closest I got was with scummy tools but they just come across stumbling blocks when trying to extract, and not got the time at the moment to look into the coding aspect of it as much as I would like too

 

[yyoossk]

Sorry for the bump, but has there been any progress on this, I noticed the Ratalaika games that use emulation have this file, and I'm trying to figure out how to get the rom files.

I'm sorry, but no matter how much research I did, I couldn't figure it out.

Post automatically merged: Mar 9, 2023

I found extracting the rooms from pc emulators don’t like to be installed afterwards as they say the room is corrupt but maybe worth a shot as I couldn‘t find a way of decompressing them when I tried yesterday, closest I got was with scummy tools but they just come across stumbling blocks when trying to extract, and not got the time at the moment to look into the coding aspect of it as much as I would like too

Thanks for the useful info!

Post automatically merged: Mar 9, 2023

The ROMs can be extracted from RAM in an emulator like Yuzu or Ryujinx, but some exhibit significant graphical corruption PC emulators for the respective systems. Therefore, it's difficult to say if RAM dumps are the same as the raw ROMs in the zak archive or, due to how they are stored in memory, that they're non-original.

To me, this means decompressing the zak archive is the only way to be sure what files were originally packed to see if they are compatible with physical hardware or if they have been somehow modified to run on the Switch emulator but ended up being non-hardware compatible.

Thanks for the useful info!