On Mon, Sep 5, 2016 at 2:39 AM, messages JB <messages...@free.fr> 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.
