[issue36993] zipfile: tuple IndexError on extract

[Berker Peksag]

Berker Peksag <berker.peksag at gmail.com> added the comment:

This report is valid. Serhiy has improved error reporting of the extra field in feccdb2a249a71be330765be77dee57121866779.

counts can indeed be an empty tuple:

    elif ln == 0:
        counts = ()

If I'm reading section 4.5.3 of https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT correctly, I think we need to raise BadZipFile if ln == 0.

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components: +Library (Lib)
nosy: +berker.peksag, serhiy.storchaka
resolution: not a bug -> 
stage: resolved -> needs patch
status: closed -> open
type:  -> behavior
versions:  -Python 3.6

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<https://bugs.python.org/issue36993>
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