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Subject: reading  zipfile; problem using raw buffer
Date: Tue, 26 Jul 2011 08:42:25 -0400
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Thread-Topic: reading  zipfile; problem using raw buffer
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From: "Sells, Fred" <fred.sells@adventistcare.org>
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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 =3D ''
    f =3D open(filename)
    for i in range(22):
        block =3D f.read()
        if len(block) =3D=3D 0:=20
            break
        else:
            buffer +=3D block

    print len(buffer)
    tmp =3D open('tmp.zip', 'w')
    tmp.write(buffer)
    tmp.close()
    zf =3D 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')   =20
  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