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  • 5 months later...
Posted

I don't know if it will help, but I tried to analyze some game files (specifically OPTIONS.BIN), and in them I found traces of zlib as well as gzip. 

52 Offset 1F 8B (.gz) - GZIP
32 Offset 78 01 (zlib No compression(no preset dictionary)
12 Offset 78 5E (zlib Best speed (no preset dictionary)
1 Offset 78 9C (zlib Default Compression (no preset dictionary)
6 Offset 78 DA (zlib Best Compression (no preset dictionary)
41 Offset 78 20 (zlib No Compression (with preset dictionary)
9 Offset 78 7D (zlib Best speed (with preset dictionary)
5 Offset 78 BB (zlib Default Compression (with preset dictionary)
4 Offset 78 F9 (zlib Best Compression (with preset dictionary)
 

which doesn't say anything exactly but you mentioned the use of ZLSS compression, I don't rule out that since i could be wrong because I didn't research much about compression types. I focused on understanding this game's.

On the other hand, I didn't have many results with the bms script (which could help a lot), it has some scripts that I tried to use without success. Maybe the files are compressed one way for the images, and another way for the compiled images, that would explain why there is no header. Something like LZMA that came out years before the game, and is also similar to the LZ77 algorithm according to reliable sources (wikipedia lol), but I hope it is possible to at least outline some alternatives.

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