Re: zip freezes - how to handle corrupt CRC in zip-file

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On Tue, August 14, 2007 5:42 am, ecc wrote:
> i´m reading zip-files with the php zip-functions without a problem.
> Now i
> got and Zip containing an corrupt crc (If i open this file via winzip,
> the
> error is shown).
>
> It looks like the php functions for zip-handeling "zip_entry_read" and
> "ZipArchive::getFrom..." do not quit on a bad crc checksum.... so
> these
> functions read in the file and than are in an infinite loop. Because i
> use
> PHP-GTK2 my tool feezes and the process has to be killed. On an
> web-enviroment this could also a big problem ..... ok, user-zip
> handeling on
> web is not the best idea :-)
>
> I´ve found no way to find out, if an file in the zip file is an valid
> or
> corrupt entry. The output of "ZipArchive::statName" give me no info
> about
> the state of an entry.
>
> Is there any trick out there, how to manage this problem. Maybe this
> is an
> bug or missing feature in the zip extensions. Dont know!

Perhaps checking the consistency with this ZIPARCHIVE::CHECKCONS flag
would help.

This is just a wild guess.

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