Nadeem Vawda <nadeem.va...@gmail.com> added the comment:

Here is an update patch, which corrects a typo in the previous patch, and adds 
a test to test_zlib.

The test uses a memory-mapped sparse file, so it gets skipped on systems 
without mmap. The alternative would be to allocate a 4+GB buffer of ordinary 
memory, causes heavy swapping on my machine (4GB of RAM). The test also gets 
skipped on 32-bit builds, where the address space is too small for this bug to 
arise.

I'm not sure whether the test can count on the created file actually being 
sparse, so I had the test require the 'largefile' resource, to be on the safe 
side.

----------
Added file: http://bugs.python.org/file20543/zlib-v2.diff

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