John Jolly <jjo...@suse.com> added the comment:

Fix submitted that evaluates the ECD structure and validates the first CD 
entry. The fix also handles empty zipfiles.

IMO the purpose of this API is to *quickly* verify that the file is a valid 
zipfile. With this fix, the API only reads another 46 bytes of data (after a 
seek, of course). This should still qualify as "quick", especially after having 
potentially read 64k of data.

Perhaps a full zip validator would be appropriate in addition to is_zipfile. 
That would be more appropriate as a full feature rather than in this bugfix.

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nosy: +jjolly

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<https://bugs.python.org/issue28494>
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