[issue10694] zipfile.py end of central directory detection not robust

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

This change significantly increased the probability of false positive detection in is_zipfile(). It was around 1/2**32, now it is around 1/2**16. It looks small, but not enough small if you test hundreds of thousands files. See issue28494.

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nosy: +serhiy.storchaka

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