[debbugs-tracker] bug#24371: closed (Bad value of size with --list)

[GNU bug Tracking System]

Your message dated Mon, 5 Sep 2016 18:45:34 -0700
with message-id <address@hidden>
and subject line Re: bug#24371: Bad value of size with --list
has caused the debbugs.gnu.org bug report #24371,
regarding Bad value of size with --list
to be marked as done.

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24371: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=24371
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--- Begin Message --- Subject: Bad value of size with --list Date: Mon, 5 Sep 2016 11:39:48 +0200 User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

Hi!

The size of the file restored by the option "--list" is incorrect if the file is more big than 4GB.

[/mnt/DATA/TEST]ll
total 8184100
-rw-r--r-- 1 jacques jacques 8380511744 févr. 16  2016 file.bin

[/mnt/DATA/TEST]gzip file.bin

[/mnt/DATA/TEST]gzip -l file.bin.gz
         compressed        uncompressed  ratio uncompressed_name
         2490092407          4085544448  39.1% file.bin

[/mnt/DATA/TEST]gzip -V
gzip 1.6
Copyright (C) 2007, 2010, 2011 Free Software Foundation, Inc.
Copyright (C) 1993 Jean-loup Gailly.
This is free software.  You may redistribute copies of it under the terms of
the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
There is NO WARRANTY, to the extent permitted by law.

Written by Jean-loup Gailly.

[/mnt/DATA/TEST]

best regards

--- End Message ---

> --- Begin Message ---
>
>
>
> Subject: 
>
> Re: bug#24371: Bad value of size with --list
>
>
>
>
> Date: 
>
> Mon, 5 Sep 2016 18:45:34 -0700
>
>
>
>
> On Mon, Sep 5, 2016 at 2:39 AM, messages JB <address@hidden> wrote:
> > Hi!
> >
> > The size of the file restored by the option "--list" is incorrect if the
> > file is more big than 4GB.
> >
> >    [/mnt/DATA/TEST]ll
> >    total 8184100
> >    -rw-r--r-- 1 jacques jacques *8380511744* févr. 16  2016 file.bin
> >
> >    [/mnt/DATA/TEST]gzip file.bin
> >
> >    [/mnt/DATA/TEST]gzip -l file.bin.gz
> >              compressed        uncompressed  ratio uncompressed_name
> >              2490092407 *4085544448*  39.1% file.bin
> >
> >    [/mnt/DATA/TEST]gzip -V
> >    gzip 1.6
>
> Thanks for the report.
>
> However, this is a known and documented limitation in the format, so
> cannot be fixed in gzip. Consider using a tool with a more modern
> format, like xz.
>
> Here is the relevant part of the documentation from "info gzip":
>
>      The ‘gzip’ format represents the input size modulo 2^32, so the
>      uncompressed size and compression ratio are listed incorrectly for
>      uncompressed files 4 GiB and larger.  To work around this problem,
>      you can use the following command to discover a large uncompressed
>      file’s true size:
>
>           zcat file.gz | wc -c
>
> Since there is nothing in gzip that can be changed to address this,
> I'm closing the ticket.
>
>
> --- End Message ---