[Python-3000] Providing compress/uncompress functions in gzip

[Anand Balachandran Pillai]

On Fri, Aug 1, 2008 at 7:32 PM, Oleg Broytmann <phd at phd.pp.ru> wrote:
> On Fri, Aug 01, 2008 at 07:27:38PM +0530, Anand Balachandran Pillai wrote:
>> Of these, I have a gripe with gzip - it does not provide a simple
>> way of compressing/uncompressing a string
>
>   It does. It is zlib.compress() and zlib.decompress().

Yes, I know gzip uses zlib for performing compression. But
zlib.compress does not return a string which can be de-compressed
using gzip directly, because the gzip headers are missing.

>>> import gzip
>>> import zlib
>>> s='This is a line of text'
>>> sc=zlib.compress(s)
>>> g=gzip.GzipFile(fileobj=cStringIO.StringIO(sc))
>>> print g.read()
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/lib/python2.4/gzip.py", line 218, in read
    self._read(readsize)
  File "/usr/lib/python2.4/gzip.py", line 261, in _read
    self._read_gzip_header()
  File "/usr/lib/python2.4/gzip.py", line 162, in _read_gzip_header
    raise IOError, 'Not a gzipped file'
IOError: Not a gzipped file

I think being able to send gzip compressed strings directly would be useful
for applications which require to send gzip data over the wire without
having to write to files and read-back.

>
> Oleg.
> --
>     Oleg Broytmann            http://phd.pp.ru/            phd at phd.pp.ru
>           Programmers don't die, they just GOSUB without RETURN.
> _______________________________________________
> Python-3000 mailing list
> Python-3000 at python.org
> http://mail.python.org/mailman/listinfo/python-3000
> Unsubscribe: http://mail.python.org/mailman/options/python-3000/abpillai%40gmail.com
>



-- 
-Anand