Disk image (ISO) file structure ?

Discussion in 'PSP - Hacking & Homebrew' started by omarrrio, Oct 18, 2015.

  1. omarrrio
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    omarrrio GBAtemp Advanced Fan

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    Hi, i am trying to make a tool that reads the ICON0.png and show it on my solution, but i am unable to find the pointers to said file, any chance someone can help a bro out ?

    Thanks.
     
  2. JamRules

    JamRules ...

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    I assume that it'll change per .iso so you'll have to try parsing the .iso header.

    Not sure how to do it properly but if you can search for the file name,
    above it you'll find the starting LBA and then the file size.

    Starting LBA comes first and is stored in both endian formats.
    The file size in bytes is next, again in both formats.

    [​IMG]

    0xDDD0 * 0x800 = 0x06EE8000 so this is the start of the .png

    [​IMG]

    The size was 0x56AC (22188) bytes so the end is at 0x06EED6AC

    [​IMG]

    You can possibly find a library to do it properly
     
    Last edited by JamRules, Oct 18, 2015
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  3. omarrrio
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    omarrrio GBAtemp Advanced Fan

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    Thanks Jam, i noticed that the Disk image of a PSP game, contains only one file ICON0.PNG, so i'll just IndexOf the string minus a few vytes to get the position and size :D
     
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