From: Matthew Brett on 9 May 2010 04:28 Hi, I sorry if this is a bad place to ask, but I wanted to find out if the behavior I'm seeing is a bug. I maintain scipy's matlab file readers, and I came across a zlib compressed string that causes a zlib error on decompression, but only with zlib.decompress, not zlib.decompressobj. I saved the original compressed string as a binary file at http://dl.dropbox.com/u/794947/mat.bin Now if I do: import zlib data = open('mat.bin', 'rb').read() out = zlib.decompress(data) I get an error : Error -5 while decompressing data) If instead I do this: out = zlib.decompressobj().decompress(data) I get a usable uncompressed string. I was expecting these two calls to do the same thing. Is that expectation right? If not, is there somewhere I could find out why? Thanks a lot, Matthew
From: Matthew Brett on 9 May 2010 12:25 Hi, Thanks for the reply. > > If instead I do this: > > > out = zlib.decompressobj().decompress(data) > > How about: > > d = zlib.decompressobj() > out = d.decompress(data) + d.flush() Do you mean, that you would then expect the decompressobj method to fail as well? But, no, d.flush() returns the empty string after decompressing ``data``. Thanks again, Matthew
From: Antoine Pitrou on 9 May 2010 13:33 On Sun, 9 May 2010 09:25:16 -0700 (PDT) Matthew Brett <matthew.brett(a)gmail.com> wrote: > > How about: > > > > d = zlib.decompressobj() > > out = d.decompress(data) + d.flush() > > Do you mean, that you would then expect the decompressobj method to > fail as well? Yes. > But, no, d.flush() returns the empty string after decompressing > ``data``. Hmm, then it's a bug. Can you report it to http://bugs.python.org ? Thank you Antoine.
From: Matthew Brett on 9 May 2010 17:19 Hi, > > Do you mean, that you would then expect the decompressobj method to > > fail as well? > > Yes. > > > But, no, d.flush() returns the empty string after decompressing > > ``data``. > > Hmm, then it's a bug. Can you report it tohttp://bugs.python.org? I will - thanks for your advice, Matthew
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