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Tetriser, posted Mon Jan 18, 2021 5:26 am (61718)

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iDreams = Infinite Dreams, btw

Games like Sky Force, KRally and Explode Arena on older Symbian on Nokia phones (Series 60 v2, to be exact), which use PAK files without any headers.

This is how it looks like (KRally's in this case):


The question is, are there any extractors or BMS scripts that can interpret these archives?

aluigi, posted Thu May 13, 2021 9:19 am (63982)

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Do you see any interesting information maybe at the end of the archive?
Feel free to upload a sample file for analysis.

Tetriser, posted Thu May 13, 2021 11:36 am (63996)

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aluigi wrote:

Do you see any interesting information maybe at the end of the archive?
Feel free to upload a sample file for analysis.

Unfortunately, nothing


Also here's another PAK (this one is from the original Sky Force)

aluigi, posted Thu May 13, 2021 11:46 am (63998)

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Ok the file was xored with 0xaa.
So everything is ok now but it uses at least two compression algorithms that I can't recognize at the moment (I didn't check further).
In the meantime this is the work-in-progress script, once someone will figure out the two algorithms it will be easy to finish it:

Code:

getdstring ZERO 16
get FILES long
filexor 0xaa
for i = 0 < FILES
    get SOME_CRC long
    get OFFSET long
    get SIZE long
    get ZSIZE threebyte
    get ZIP byte
    if ZIP == 0
        log "" OFFSET SIZE
    elif ZIP == 2
        comtype ???
        math OFFSET   4
        math ZSIZE  - 4
        clog "" OFFSET ZSIZE SIZE
    elif ZIP == 3
        comtype ???
        clog "" OFFSET ZSIZE SIZE
    else
        print "Error: unknown ZIP %ZIP%"
        cleanexit
    endif
next i