A replacement for the builtin zipfile module, with fast, C-based zipfile
decryption

czipfile is a replacement for Python's builtin "zipfile" module, and provides
much faster, C-based zipfile decryption. The code is actually 95% identical to
Python 2.6.5's Lib/zipfile.py, with some very minor modifications to allow it
to compile in Cython, and the _ZipDecrypter class adapted to take advantage of
native C datatypes.