I've tested this patch in pcsx2 with several ISOs mostly of different sizes e. It works with non-English filenames, but it uses the same methods of file access as the gz compression type, so it will have whatever known bugs that has.
Performance: I have not carefully measured performance. This is a newly supported format and I've primarily ensured it does not impact existing performance. However, based on performance tests and improvements, some of which incorporated here made with PPSSPP, I'm fairly sure it won't perform poorly. That is, this is already based on an optimized implementation. The first is not even implemented with gz file support. The second did not give a very big improvement on PPSSPP, but did provide a measurable one, and so as I mentioned, I can implement it after this is merged. Neither have seen any significant adoption. This patch will reject files of either type as invalid. This implementation does use a small cache, which is the last-decompressed frame important when games read small numbers of bytes sequentially. It's definitely good for performance, although deflate is fast even without it, of course. If that's not the case, sure, I'd be more than happy to split them out. I also would prefer the two classes be in separate files with their own names. Otherwise, I would recommend the following to answer your question since CisoPlus is not open source. So it won't even appear to work, at least.
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