zlib and gzip

[Hornberger, Chris]

I got rid of the offsets for a quick test (see code) 

import base64, zlib

def getString(s):
  s = base64.decodestring(s)
  s = zlib.decompress(s ) #, -15)
  return s

def makeString(s):
  s = zlib.compress(s ) #, 9)
  s = base64.encodestring(s)
  return s

initialdata = "this is a test"
print "1)" + initialdata
compresseddata = makeString( initialdata )
print "2)" + compresseddata
uncompressed = getString( compresseddata )
print "3)" + uncompressed

and got the following results:

C:\>comp.py
1)this is a test
2)eJwrycgsVgCiRIWS1OISACYzBRY=

3)this is a test

C:\>



--------------------------
Chris Hornberger
Blackrock - 302.797.2318
chris.hornberger at blackrock.com

Card carrying MSDN member since 2004.
No, really. I've got the card to prove it.


-----Original Message-----
From: python-list-bounces+chris.hornberger=blackrock.com at python.org
[mailto:python-list-bounces+chris.hornberger=blackrock.com at python.org]On
Behalf Of Hornberger, Chris
Sent: Wednesday, May 12, 2004 1:14 PM
To: Bakken, Gregory A; python-list at python.org
Subject: RE: zlib and gzip


Ok, fair enough. Can you supply (if it's non-sensitive information) some samples? 

I'm on this conference call for the next hour or so, so I'm glued to my desk. I have time to tinker. It's just a general status call. I just have to chime in from time to time.

--------------------------
Chris Hornberger
Blackrock - 302.797.2318
chris.hornberger at blackrock.com

Card carrying MSDN member since 2004.
No, really. I've got the card to prove it.


-----Original Message-----
From: Bakken, Gregory A [mailto:gregory_a_bakken at groton.pfizer.com]
Sent: Wednesday, May 12, 2004 1:10 PM
To: Hornberger, Chris; python-list at python.org
Subject: RE: zlib and gzip


The short answer is I don't know.  The longer answer is that I really don't
know the driving force behind the compression/encoding that is being used.
What I am doing is a more downstream process (so I am stuck with the chosen
scheme).

-----Original Message-----
From: Hornberger, Chris [mailto:Chris.Hornberger at blackrock.com]
Sent: Wednesday, May 12, 2004 1:04 PM
To: Greg Bakken; python-list at python.org
Subject: RE: zlib and gzip


Silly questions first: Is it just a matter of 72 column-bounding to make it
email-compliant? (keep in mind I haven't  run your sample code yet, I'm
sitting here perusing while on a conference call - meetings suck!!!)

--------------------------
Chris Hornberger
Blackrock - 302.797.2318
chris.hornberger at blackrock.com

Card carrying MSDN member since 2004.
No, really. I've got the card to prove it.


-----Original Message-----
From: python-list-bounces+chris.hornberger=blackrock.com at python.org
[mailto:python-list-bounces+chris.hornberger=blackrock.com at python.org]On
Behalf Of Greg Bakken
Sent: Wednesday, May 12, 2004 12:57 PM
To: python-list at python.org
Subject: zlib and gzip


I am writing a python program that recieves 'compressed and encoded'
strings from another piece of software.  I can successfully uncompress
and decode the strings via

import base64, zlib
def getString(s):
  s = base64.decodestring(s)
  s = zlib.decompress(s, -15)
  return s

Now, I want to take a 'readable' text string, and compress and encode
it the same way as the other piece of software.  I first tried the
seemingly obvious (but incorrect)

import base64, zlib
def makeString(s):
  s = zlib.compress(s, 9)
  s = base64.encodestring(s)
  return s

I have also tried using the gzip module to do this like

import base64, gzip, StringIO
def makeString(s):
  sio = StringIO.StringIO()
  gzipper = gzip.GzipFile(mode="wb", fileobj=sio)
  gzipper.write(s)
  s = base64.encodestring(sio.getvalue())
  return s

What I would like to be able to do is take a string s, pass it through
the makeString function, and pass the result through the getString
function, and end up with the original string s back.  I have to stick
with the way getString is, so I can handle strings from another
program, so I need to adapt makeString accordingly, but cannot figure
out how.

Greg
-- 
http://mail.python.org/mailman/listinfo/python-list


LEGAL NOTICE
Unless expressly stated otherwise, this message is confidential and may be privileged. It is intended for the addressee(s) only. Access to this E-mail by anyone else is unauthorized. If you are not an addressee, any disclosure or copying of the contents of this E-mail or any action taken (or not taken) in reliance on it is unauthorized and may be unlawful. If you are not an addressee, please inform the sender immediately.

-- 
http://mail.python.org/mailman/listinfo/python-list