I can't imagine anyone depending on this lack-of-feature, but there's no arguing with the technicality of it.  One more small incentive to make the jump to Python 3 then.

Anyway, I've revisited the patch to clean up the logic and control flow, and added another test to ensure that it works even when the EOCD record crosses a chunk boundary.  Also checked that it works on win32, which fortunately it did without modification.