This is the large change in the branch.
This lets us use either the host filesystem or (in the future) a NAND
image exactly the same way, and make sure the IPC emulation code
behaves identically. Less duplicated code.
Note that "FileIO" and "FS" were merged, because it actually doesn't
make a lot of sense to split them: IOS handles requests for both
/dev/fs and files in the same resource manager, and as it turns out,
/dev/fs commands can *also* be sent to non /dev/fs file descriptors!
If we kept /dev/fs and files split, there would be no way to
emulate that correctly. I'm not aware of anything that does that (yet?)
but I think it's important to be correct.
Now that we have a proper filesystem interface, it makes more sense
to return it instead of the emulated IOS device (which isn't
really usable for any purpose other than emulated IPC).
Extract the existing FS code into a HostBackend implementing
the filesystem interface.
Compared to the original code, this uses less static state.
The open host files map is now a member variable
as it should have been. Filesystem handles are now also easier
to savestate. Some variable names and log messages were cleaned up.
Nothing else has been changed.
Add a new FileSystem class that can be used to perform operations
on the emulated Wii filesystem.
This will allow separating the IPC code (reading from and writing to
memory to handle IOS FS commands) and the actual filesystem code
in a much better way.
This also paves the way for implementing another filesystem backend
in the future -- NAND images for more complete emulation, including
filesystem metadata like permissions or file orders, which some games
and homebrew actually care about -- without needing to make any more
changes to the other parts of the codebase, in addition to making
filesystem behaviour tests easier to write.
This adds a lightweight, easy to use std::variant wrapper intended to
be used as a return type for functions that can return either a result
or an error code.
Makes our libraries explicitly link in which libraries they need.
This makes our dependencies explicit and removes the reliance on the
LIBS variable to contain the libraries that they need.
This will create a merge conflict if two PRs try to increment the
cache version at the same time, which makes it noticeable that the
PR that gets merged last needs to increment the cache version again.
We already use this for savestates and the game list cache.
Regression from 1f1dae3.
This problem doesn't happen in DolphinWX as far as I know, but if
you've ran into the problem in DolphinQt2, it will carry over to
DolphinWX because of the shared game list cache.
