On Mon, Feb 23, 2015 at 8:24 PM, Paul Moore <p.f.mo...@gmail.com> wrote:
> On 23 February 2015 at 19:01, Daniel Holth <dho...@gmail.com> wrote: > > Sounds reasonable. It could be done by just reading the entire file > > contents after the shebang and re-writing them with the necessary > > offset all in RAM, truncating the file if necessary, without involving > > the zipfile module very much; the shebang could have some amount of > > padding by default; the file could just be re-compressed in memory > > depending on your appetite for complexity. > > The biggest problem with that is finding the end of the prefix data. > Frankly it's easier just to write a new prefix then use the zipfile > module to rewrite all of the content. That's what the current code > does writing to a new file. I don't think you need to rewrite all of the contents, if you don't mind poking into zipfile internals: endrec = zipfile._EndRecData(f) prefix_length = endrec[zipfile._ECD_LOCATION] - endrec[zipfile._ECD_SIZE] - endrec[zipfile._ECD_OFFSET] I do something similar to get at the prefix, although I need the zipfile opened anyway, so I use: endrec = zipfile._EndRecData(f) # pylint: disable=protected-access zf = zipfile.ZipFile(f) # endrec is None if reading it failed, but then ZipFile should have # raised an exception... assert endrec prefix_len = zf.start_dir - endrec[zipfile._ECD_OFFSET] # pylint: disable=protected-access Paul > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/thomas%40python.org > -- Thomas Wouters <tho...@python.org> Hi! I'm an email virus! Think twice before sending your email to help me spread!
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