jaames / game-builder-garage-editor Goto Github PK

This is a special Nodon type that only appears in tutorial levels, so I wonder what happens when it's in regular games?

Edited game files load fine when opening them normally, however when trying to upload them to the online gallery, the game will tell you the data is corrupted. Copying or editing the file in the game (in an attempt to get it to fix the file itself) doesn't make a difference. This limits the usefulness of this save editor quite a lot.

I think this is likely due to a hash somewhere in the savedata not matching the game file after it's been edited. I've located what appears to be a file hash list, but need to figure out how these hashes are generated to be able to check if this is the culprit.

Reference save file (no levels here are edited):
savedata.zip

The relevant files are

• LgcTpb.bin - Table of game files, this contains some kind of hash for each file
• LgcTpbFile_MyGame[ ].bin - Game files, these don't contain a hash
• Other files are unknown / likely irrelevant

LgcTpb.bin contains an array of hashes with the key 343f7f9b (mValueHashCache[].u32), which is an uint32 array containing an element for each game file.

The hashes in the reference save's LgcTpb.bin are:

0x3cc5177a, 0xf88aea9a, 0xcd8c72b1, 0xc4690251, 0xe76f4b06, 0xf35ee1b1, 0xdd6bdd3b, 0x1b893be3

Reverse engineering notes:

• I've already tried checking if these are the crc32 of the file data -- they're not
• Function at 71008cd050 handles parsing LgcTpb.bin
• Function at 71008ce0c0 handles looping through all the mValueHashCache[].u32 array elements in LgcTpb.bin
• Function at 71007a3080 seems to handle adding keys to the game file (or something else?) for upload, including a key called mValueHash

Game thumbnails seem to appear darker here than they are in-game. Looking through the rom it looks like Nintendo is setting gamma correction to 1.5, so I think thumbnails need to be gamma-corrected to .66 to correct for this

There's a lot of unused Nodon types, noted with a comment here:

https://github.com/jaames/game-builder-garage-editor/blob/main/src/objects/Nodon/ActorTypes.ts

Most of these are likely holdovers from Labo Garage, but still might be worth looking into