[Python-Dev] Fast Implementation for ZIP decryption

[CJ Kucera]

Hello list, resurrecting a rather old thread from here:

http://mail.python.org/pipermail/python-dev/2009-August/091450.html

I've actually come across a use case where faster zipfile decryption
would be very helpful to me (though one could certainly argue that it's
a frivolous case).  I'm writing a map editor for a game whose graphics
datafiles are stored inside an encrypted zipfile.  I've received the
game developer's blessing for my editor to be able to read inside the
zipfile, so legality isn't an issue here, but the pure-Python decryption
currently available in the 'zipfile' module really is dog-slow.

When I have my app load directly from already-uncompressed files on the
HD, it's rare for a map to take more than 1 second to load; when the app
has to use the pure-Python decryption routines to load all the graphics
images, it can take over a minute (and this is on a 3GHz Core 2 Duo).

Bundling the necessary graphics with my app isn't an option, nor is
asking users to crack the zipfile encryption themselves to provide an
uncompressed directory to read from.

So anyway, I'd at least love to have a peek at the C code mentioned in
the thread; if nothing more, perhaps I could bundle it into something
that could be installed optionally by someone who wants it.  Does anyone
still have this code available somewhere?

Thanks a bunch,
CJ

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