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Can I determine if a patch is necessary without performing it in IcePatch2

Hi,

I have written a patch client which works OK but I'd like to be able to determine if the patch is necessary before I perform it. Is there anyway I can find out if prepare() detected a checksum mismatch (thorough or otherwise) and avoid calling patch() if not?

I want to be able to offer 'An update is available do you want to install it?' function.

Thanks,

Alex.