[Python-Dev] [Python-checkins] cpython (2.7): Issue #10276: test_zlib checks that inputs of 2 GB are handled correctly by

Nadeem Vawda nadeem.vawda at gmail.com
Thu May 5 11:43:19 CEST 2011

On Thu, May 5, 2011 at 11:33 AM, Victor Stinner
<victor.stinner at haypocalc.com> wrote:
> Le mercredi 04 mai 2011 à 15:40 -0700, Ethan Furman a écrit :
>> The comment says 'check that inputs of 2 GB are handled correctly' but
>> the file created is 1 byte short of 2Gb.  Is the test wrong, or just
>> wrongly commented?  Or am I not understanding?
> If you write a byte after 2 GB of zeros, the file size is 2 GB+the few
> bytes. This trick is to create quickly a large file: some OSes support
> sparse files, zeros are not written on disk. But on Mac OS X and
> Windows, you really write 2 GB+some bytes.

Ethan's point is that 0x7FFFFFFF is not 2GB - it is (2G-1) bytes. So the
test and the preceding comment are inconsistent.

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