Re: [Boost-bugs] [Boost C++ Libraries] #3352: CRC not correctly computed on x64 during decompression of gzip archive

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #3352: CRC not correctly computed on x64 during decompression of gzip archive
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-08-18 17:44:29

#3352: CRC not correctly computed on x64 during decompression of gzip archive
--------------------------------------+-------------------------------------
 Reporter:  thomas.suckow@…           |       Owner:  turkanis 
     Type:  Bugs                      |      Status:  new      
Milestone:  Boost 1.40.0              |   Component:  iostreams
  Version:  Boost Development Trunk   |    Severity:  Problem  
 Keywords:  x64 64bit gzip iostreams  |  
--------------------------------------+-------------------------------------

Comment(by thomas.suckow@…):

 Line of fault is:

 crc_ += value << (offset_ * 8);

 in gzip.cpp

 When the shift results in a large negative value, the 32bit crc should
 roll over. But long on x64 is 64bit and the result is incorrect.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/3352#comment:1>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.