Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.freenet.ag!news2.euro.net!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path: <davea@davea.name>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.018
X-Spam-Evidence: '*H*': 0.96; '*S*': 0.00; 'python.': 0.02; 'example:': 0.03; 'subject:file': 0.07; 'python': 0.11; 'suggest': 0.14; 'algorithm.': 0.16; 'compression': 0.16; 'words.': 0.16; 'files.': 0.16; 'wrote:': 0.18; 'module': 0.19; 'example': 0.22; 'header:User-Agent:1': 0.23; 'header': 0.24; 'file.': 0.24; 'post': 0.26; 'header:In-Reply-To:1': 0.27; 'getting': 0.31; "d'aprano": 0.31; 'steven': 0.31; 'file': 0.32; 'text': 0.33; 'guess': 0.33; 'plain': 0.33; 'could': 0.34; 'but': 0.35; 'similar': 0.36; 'checks': 0.38; 'to:addr:python-list': 0.38; 'fact': 0.38; 'pm,': 0.38; 'does': 0.39; 'success.': 0.39; 'to:addr:python.org': 0.39; 'enough': 0.39; 'skip:u 10': 0.60; 'simple': 0.61; 'zip': 0.64; 'more': 0.64; 'here': 0.66; 'received:74.208': 0.68; 'fails,': 0.84; 'received:74.208.4.194': 0.84
Date: Fri, 19 Apr 2013 21:50:49 -0400
From: Dave Angel <davea@davea.name>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130308 Thunderbird/17.0.4
MIME-Version: 1.0
To: python-list@python.org
Subject: Re: unzipping a zipx file
References: <mailman.834.1366394500.3114.python-list@python.org> <5171e036$0$29977$c3e8da3$5496439d@news.astraweb.com>
In-Reply-To: <5171e036$0$29977$c3e8da3$5496439d@news.astraweb.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-Provags-ID: V02:K0:OG8SwmCVMAKYWqHV+ISw8tdk6ig9Ae7svB88UCAh6w3 qWSFGyxiSOirtvVlSxOu9LFZfcuv+qh8xJKgncRyPatUsiDPnG Bxoy/1ZG2sgZdUHAqSZhXGeeTcdqI8gNx8L7dh1UQ6dqvk54T3 x/XeH/6I25RKhVw0OGiAjmhVVJlESoS1Q0ina0NOp4W3GzDrmt uoBcTreyosNVm/4tSg7a0j89JnNE23vRRnC1qRzsPq8PbtGNkg 5GsN75NZ8rgN8yWc4j1i/vyaM/n/AwOZ9pTB7RsvtZjEN6HPKP 7thVKQwCU/QRoPExvXDHRXH61vyOXadzwor3AIRteRAPr7y0g= =
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe: <http://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive: <http://mail.python.org/pipermail/python-list/>
List-Post: <mailto:python-list@python.org>
List-Help: <mailto:python-list-request@python.org?subject=help>
List-Subscribe: <http://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups: comp.lang.python
Message-ID: <mailman.845.1366422671.3114.python-list@python.org>
Lines: 30
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1366422671 news.xs4all.nl 2219 [2001:888:2000:d::a6]:54332
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:43945

On 04/19/2013 08:24 PM, Steven D'Aprano wrote:
>
>
     <SNIP>
>
> You are missing that zipx is not the same as zip, and Python very likely
> does not support the zipx compression algorithm.
>
> http://kb.winzip.com/kb/entry/7/
>
> My guess is that the zipx header is similar enough to zip that Python can
> retrieve the file names, but it cannot decompress the files.
> Unfortunately, instead of getting a nice error, it is fooled into
> thinking that it decompressed when in fact you just got junk.
>

The zip header includes a 32bit CRC for each file.  Do you know whether 
the zip module checks that CRC ?
>
> I suggest that you start with a simple example: create a plain text file
> with just a few words. Compress this single file to .zipx, then try to
> decompress it using Python. If it still fails, you will have a simple
> example that you could post here and see if others have more success.
>
>
>


-- 
DaveA