[issue9837] ZipFileExt.read() reads more data than requested

[Black Dew]

Black Dew <blackdew at gmail.com> added the comment:

If i follow the logic in read1() correctly it will do that only for files with very low compression ratios (the original sample where i noticed that problem was actually a chunk of encrypted data inside the zip).

>From the comments referring to "with at most one read() system call" I would also assume it's OS-specific.

Anyway, I've attached a small file that reproduces this behavior on my system (win xp 32bit). When i run it i get "AssertionError: Read returned 4097 bytes (4096 requested)"

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Added file: http://bugs.python.org/file18860/a.py

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