Re: [Boost-bugs] [Boost C++ Libraries] #2318: A particular string for which compressing/uncompressing using iostreams/zlib fails.

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #2318: A particular string for which compressing/uncompressing using iostreams/zlib fails.
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2008-10-14 22:37:55

#2318: A particular string for which compressing/uncompressing using
iostreams/zlib fails.
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  Reporter:  guy_tannenbaum_at_[hidden]  |       Owner:  turkanis 
      Type:  Bugs                      |      Status:  new      
 Milestone:  Boost 1.37.0              |   Component:  iostreams
   Version:  Boost 1.36.0              |    Severity:  Problem  
Resolution:                            |    Keywords:           
---------------------------------------+------------------------------------

Comment(by rbock_at_[hidden]):

 Hi,

 I found the same problem in 1.36. It is rather rare: In 6.5Million
 compressed files in my project, it occurred only 441 times. As mentioned
 by Guy, the size of the damaged zip is a bit peculiar, all sizes I checked
 are multiples of 4096.

 Also, I think it is more related to filtering_istream and
 filtering_istreambuf than zlib_compression, as it works fine if you use
 filtering_ostream or filtering_ostreambuf instead.

 I am going to attach an extended example with similar code which does not
 work, too for the given example string and code which does (using
 filtering_ostream instead of filtering_istream for compression).

 I am also attaching a binary version of the sample data, since reading the
 ascii version did not work for me (I had to replace the lexical_cast by
 atoi to make it work).

 Here is some system information, if this should be required to reproduce
 the problem (and circumvention):

 Ubuntu 8.04 64bit, gcc 4.2.3, boost-1.36, zlib-1g 1.2.3.3

 Please do not hesitate to ask for more information. Personally, I consider
 this a rather severe problem since it can impair data integrity in
 backups. Lucky me, my software is not in production yet :-)


 Regards,

 Roland

-- 
Ticket URL: <http://svn.boost.org/trac/boost/ticket/2318#comment:2>
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