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cyclone2426, posted Sun Sep 24, 2017 11:16 pm (26797)

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Madden 08 has many DAT files and within those DAT files are a long list of compressed files. It doesnt seem to be anything common as the header is just garbled letters/numbers. It is possible to rip the uncompressed version once the game is running, but it is a hassle to do for each file. I was hoping to get some insight to see if the compression can be figured out so that there could be an easier way to decompress these. And if it is figured out, would it be possible to create something where you could recompress the file to put it back in the game? (Wouldn't be necessary, but interesting nonetheless)

Thanks in advance to anyone who can shed some light on this. I've attached the compressed file and the uncompressed MMAP of one of the files.

aluigi, posted Mon Sep 25, 2017 4:54 pm (26824)

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I don't know what algorithm is used because it's not zlib or deflate, but I suspect there is also some obfuscation there.
From offset 0x87 to 0x8e there is just a sequence of zeroes so it's probably an header zeroes compressed data