libspk - A library for reading virtual files from an archive

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rsoft
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libspk - A library for reading virtual files from an archive

Post by rsoft » July 28th, 2013, 1:29 am

The disks games like Need for Speed 4 and others use mostly contain files that turn out to be archives.
This has, depending on the archive format, several advantages over storing the files directly on the ISO-9660 file system:
  • - Possibility to use longer and more complex file names
    - Ability to "multiplex", effectively increasing the maximum file count
    - Professional looking disk contents, even if you are using plain TIMs for graphics
My particular package/archive format (SPK) currently has the following limitations:
  • - Maximum virtual file size of 0xFFFF bytes (shouldn't be hard to increase)
    - Default file name size of up to 64-3 characters (can be changed at compile-time)
    - A maximum of 255 virtual files
    - No hierarchy/directories
The library (libspk) is designed to allow for the following features:
  • - Fairly low memory footprint
    - Can be "instanciated" to allow for multiple open archives at once
    - Up to 16 concurrently open virtual files (can be changed at compile-time)
    - Portable (requires only fairly standard C functions)
    - Completely static memory usage (doesn't allocate or free memory at run-time)
As of now, it doesn't work with PSY-Q due to the absence of fopen, fread, fseek and ftell, but it shouldn't be too hard to write some compatibility functions for PSY-Q as they don't even have to support the full function set.
It works with Tails92's PSXSDK and natively on Linux with a standard GNU toolchain though.
It's not fully tested but should at least work partially.
You can get the latest version over on GitHub: https://github.com/rsoft-/libspk
It's currently released under GPLv3 but that might change in the future. (Maybe zlib, but I'm not sure as of yet.)

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Shendo
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Re: libspk - A library for reading virtual files from an arc

Post by Shendo » July 28th, 2013, 10:15 am

Nice job. Not only does it get rid of the limitations imposed by the filesystem but you can do a basic protection of your data.
My PS1 consoles: 2 x SCPH-1002, SCPH-5552, SCPH-7002, 4x SCPH-9002, 2 x SCPH-102.
Dev console: SCPH-9002, MM3 - 7 wire modchip, PAL color mod, CH340 serial cable addon.

rsoft
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Re: libspk - A library for reading virtual files from an arc

Post by rsoft » July 28th, 2013, 6:59 pm

Thanks!
But using it as a protection scheme (be it basic or not) is neither encouraged, nor is it effective being used as one as it is an open format.

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