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Title: ZipInfo shows incorrect file size for large files
Type: Stage:
Components: Library (Lib) Versions: Python 2.3
Status: closed Resolution: out of date
Dependencies: Superseder:
Assigned To: Nosy List: akuchling, christian.heimes, osuchw
Priority: normal Keywords:

Created on 2003-11-25 20:09 by osuchw, last changed 2022-04-11 14:56 by admin. This issue is now closed.

Messages (3)
msg60430 - (view) Author: Waldemar Osuch (osuchw) Date: 2003-11-25 20:09
When dealing with large zipped files I've noticed that
ZipInfo instance was reporting incorrect file size.
I could reproduce the error by:

txtfile = file('bigone.txt','w')
for i in xrange(10**8):
    txtfile.write('%-9s Hello World\n'%i) 

Now I zip the bugger and:
z = zipfile.ZipFile(file('','r'))
fi = z.infolist()[0]

After changing on line 26 from:
structCentralDir = "<4s4B4H3l5HLl"
structCentralDir = "<4s4B4H3L5HLl"

I get:
z = zipfile.ZipFile(file('','r'))
fi = z.infolist()[0]

Sorry for a digression but it would be nice to have
something similar to a module from Twisted distribution
(twisted.python.zipstream) in standard library.
The above module allows to read a zipped file in chunks
using iterator.  It would help tremendously when
dealing with large files.
msg60431 - (view) Author: A.M. Kuchling (akuchling) * (Python committer) Date: 2003-12-23 19:14
Logged In: YES 

This isn't a sufficient fix; doesn't seem to handle files 
whose sizes don't fit into 32 bits.  The ZIP specification
at http://www.pkware.
com/products/enterprise/white_papers/appnote.html#2 describes a 
zip64 format which can handle files larger than this limit; supporting 
it would require more extensive changes to
msg61333 - (view) Author: Christian Heimes (christian.heimes) * (Python committer) Date: 2008-01-20 19:07
Several 32bit related issues were solved a while ago. Please creaet a
new issue if the latest (!) svn checkout fails for you.
Date User Action Args
2022-04-11 14:56:01adminsetgithub: 39603
2008-01-20 19:07:07christian.heimessetstatus: open -> closed
resolution: out of date
messages: + msg61333
nosy: + christian.heimes
2003-11-25 20:09:29osuchwcreate