bug#42965: Wrong uncompressed size with option --list

[Stephen Kitt]

Hi Juan,

Le 21/08/2020 10:24, Juan Diaz a écrit :
> I've seen that with large sized files (14G in this case) when I use
> the "list" option I get wrong uncompressed size and the ratio, of
> course, is wrong. I've tested it with versions 1.10 (last just
> compiled) and 1.5 (system version).

This is a known limitation, described in the gzip manpage (see the BUGS 
section):

The gzip format represents the input size modulo 2^32, so the --list 
option reports incorrect uncompressed sizes and compression ratios for 
uncompressed files 4 GB and larger.

The documented workaround is to decompress the file and measure its 
size:

    zcat file.gz | wc -c

Regards,

Stephen