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BLiNX Person, posted Tue Jan 03, 2023 11:40 pm (74852)

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I've been trying to figure out what compression algorithm is used in Tantalus Interactive's GBA games for a while now. Main reason is because these games have some 3D assets (CRIS engine) and textures that I'd like to rip. I can obtain the models from RAM as the games run, but the textures aren't as easily accessed outside of a few games that didn't have them compressed. Here's what the first 8 bytes do:
- "PACK" and "PKDW" tell the game what kind of section it's about to read
- The 4 byte integer is the length of the section (applies to every kind of section in the RBH files they came from)

lvlrk, posted Mon Mar 06, 2023 2:34 am (75702)

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Code:

# Tantalus Interactive .PACK .PKDW files extractor
# by lvlrk v1.0

endian little

getdstring SIGN 4
if SIGN == "PACK" || SIGN == "PKDW"
   get ZSIZE long
   xmath SIZE "SIZE = ZSIZE * 8"

   get NAME basename
   string NAME  = ".opk" # Output PacK

   comtype lzss0

   clog NAME 8 ZSIZE SIZE
endif

will decompress .PACK or .PKDW files
uncompressed data looks like junk though