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[Jenova's Witness]

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[Vehek]

I'm skipping over most of the detail, but, anyway...

Scan data files for tables that include sector numbers for files of a given format.(I'm not supporting virtual file systems)

But, uh, aren't those what most or all of the Square PSX games worked on here use?

[Jenova's Witness]

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[Gemini]

Which makes this pretty much useless for FFVII.

[sithlord48]

that game is one of the few that has a 3 block save requirement . i was using its saves to test detection of this in bc.

[myst6re]

The only difficulty when you manages disc images is understanding how to generate Sectors footers (EDC? Parity?). But with Final Fantasy, there is another difficulty: if you change a file position, you must update all references to that file, not just the ISO9660, but also in bin files.

[Bosola]

ECC doesn't really matter except for the Sony License sectors.

As for the disc pointers, they're all stored as simple LBA+Size. I remember a project creating a single-disc FF7 simply doing a naive replacement without decompressing any of the .X files.

If all you want to do is reinsert some files, then you should just need an application to seek a sector start and start inserting data with breaks for dummied-out sector footers. I don't think the sync or sector header data should matter if you're playing on an emulator, so you just need to break the data into 2352 byte chunks.

[myst6re]

Oh sure you can play broken isos with an emulator, but if you want burn it and play it in your PS...