Injector Maker

[elit]

I have one last question, I almost figured out everything else. I can decompress files from most games using quickbms, but those are also decompressed automatically. To reinject them back correctly I need to compress them before injecting. Quickbms doesnt do a proper job, I could not for example reinject Project CARS 2 files back as stated in my previous post. QuickBMS could not compress them to same(or lower) size and because decompressed size is different Injector Maker also wouldnt do.

Razor's video did showed me part of solution, but it did not explain how can I find out what compression method including parameters were used. His video contain existing arc.ini with already "figured out" parameters which he only adjusted to match crc. I just tried to ask FitGirl on her site but I doubt she will be very helpful.

So my question is:
If you have an original game data pack file which contain compressed game files inside, how do you find out what exact compression method - including parameters, were used to compress them?

Thanks