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Groups > comp.lang.python > #10329

reading zipfile; problem using raw buffer

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I'm tring to unzip a buffer that is uploaded to django/python.  I can
unzip the file in batch mode just fine, but when I get the buffer I get
a "BadZipfile exception.  I wrote this snippet to try to isolate the
issue but I don't understand what's going on.  I'm guessing that I'm
losing some header/trailer somewhere?

def unittestZipfile(filename):
    buffer = ''
    f = open(filename)
    for i in range(22):
        block = f.read()
        if len(block) == 0: 
            break
        else:
            buffer += block

    print len(buffer)
    tmp = open('tmp.zip', 'w')
    tmp.write(buffer)
    tmp.close()
    zf = zipfile.ZipFile('tmp.zip')
    print dir(zf)
    for name in zf.namelist():
        print name
        print zf.read(name)
____________________________________________________________
2.6.6 (r266:84297, Aug 24 2010, 18:46:32) [MSC v.1500 32 bit (Intel)]
Traceback (most recent call last):
  File
"C:\all\projects\AccMDS30Server\mds30\app\uploaders\xmitzipfile.py",
line 162, in <module>
    unittestZipfile('wk1live7.8to7.11.zip')    
  File
"C:\all\projects\AccMDS30Server\mds30\app\uploaders\xmitzipfile.py",
line 146, in unittestZipfile
    print zf.read(name)
  File "C:\alltools\python26\lib\zipfile.py", line 837, in read
    return self.open(name, "r", pwd).read()
  File "C:\alltools\python26\lib\zipfile.py", line 867, in open
    raise BadZipfile, "Bad magic number for file header"
zipfile.BadZipfile: Bad magic number for file header

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Pipe in the "return" statement Archard Lias <archardlias@googlemail.com> - 2011-07-25 05:00 -0700
  Re: Pipe in the "return" statement Ian Collins <ian-news@hotmail.com> - 2011-07-26 00:03 +1200
    Re: Pipe in the "return" statement Archard Lias <archardlias@googlemail.com> - 2011-07-25 07:16 -0700
      Re: Pipe in the "return" statement Billy Mays <81282ed9a88799d21e77957df2d84bd6514d9af6@myhashismyemail.com> - 2011-07-25 10:31 -0400
        Re: Pipe in the "return" statement Ethan Furman <ethan@stoneleaf.us> - 2011-07-25 13:07 -0700
          Re: Pipe in the "return" statement Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-07-28 08:26 +0200
      Re: Pipe in the "return" statement Oliver Bestwalter <oliver@bestwalter.de> - 2011-07-25 16:35 +0200
        Re: Pipe in the "return" statement Archard Lias <archardlias@googlemail.com> - 2011-07-25 08:05 -0700
      Re: Pipe in the "return" statement John Gordon <gordon@panix.com> - 2011-07-25 14:39 +0000
        Re: Pipe in the "return" statement Archard Lias <archardlias@googlemail.com> - 2011-07-25 08:06 -0700
      Re: Pipe in the "return" statement gwowen <gwowen@gmail.com> - 2011-07-25 07:42 -0700
  Re: Pipe in the "return" statement Christian Heimes <lists@cheimes.de> - 2011-07-25 14:33 +0200
    Re: Pipe in the "return" statement Archard Lias <archardlias@googlemail.com> - 2011-07-25 08:28 -0700
      Re: Pipe in the "return" statement Christian Heimes <lists@cheimes.de> - 2011-07-25 18:11 +0200
        Re: Pipe in the "return" statement Archard Lias <archardlias@googlemail.com> - 2011-07-25 09:30 -0700
  Re: Pipe in the "return" statement TonyO <guinness.tony@gmail.com> - 2011-07-25 05:52 -0700
    Re: Pipe in the "return" statement gwowen <gwowen@gmail.com> - 2011-07-25 06:00 -0700
    Re: Pipe in the "return" statement red floyd <redfloyd@gmail.com> - 2011-07-25 14:04 -0700
      reading  zipfile; problem using raw buffer "Sells, Fred" <fred.sells@adventistcare.org> - 2011-07-26 08:42 -0400
        Re: reading  zipfile; problem using raw buffer Billy Mays <81282ed9a88799d21e77957df2d84bd6514d9af6@myhashismyemail.com> - 2011-07-26 08:49 -0400
      Re: reading  zipfile; problem using raw buffer Peter Otten <__peter__@web.de> - 2011-07-26 15:04 +0200
      RE: reading  zipfile; problem using raw buffer "Sells, Fred" <fred.sells@adventistcare.org> - 2011-07-26 11:22 -0400

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