Browse filesystem of selected ROM about romniscience HOT 5 CLOSED

So the first thing we'd need implementation-wise is a function in Handler that returns bool and indicates if the given system actually has a filesystem or not.

This would of course need to take a ROMFile as parameter, as some ROMs for a given system might have filesystems when some don't. This could be because they're a different format (raw executables on a system which usually uses optical discs), or something like a DS ROM that just doesn't (homebrew never seems to use NitroFS when commercial ROMs always do).

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As for the functions we'll have to add to Handler to actually do the thing:

byte[] getFile(string filename)
string[] listDir(string filename) //returns names of filenames and subdirectories as a relative path
string[] getPartitions() //This will usually only return a single element which might not even need a name, but it'll have multiple for stuff like Wii

There's probably more that I'll only realise once I actually start programming the thing. Anyway, those three should allow for a usable GUI to easily be constructed.

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Actually, might put those things in a FilesystemHandler interface (or some other good name?), so that one can initialize the filesystem for a single ROM just once and that should all work. Probably? Also, need a bool hasFile(string filename)

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Actually, not Handler, we'll make it part of ROMInfo. Otherwise, this should work. Probably. Maybe?

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I'm doing the thing! Woohoo!

Gonna try and get extraction of files happening at some point this weekend if not tonight.

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