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bsdiff uses memory equal to 17 times the size of oldfileso this won't usually work for 4GB files (at least on my 8GB RAM machine).mydiff abc abc2 > patchfileandmypatch abc patchfile > abc3) regardless the size. Also, if I chop into 128 MB chunks, what happens if the first 1GB ofabc== the last (trailing) 1GB ofabc2? When we'll compareabc-first128mbwithabc2-first128mb, no match will be found, so it might not be efficient?