Re: [GNU-linux-libre] Freedom issues in lame, cdrkit, SDL, foomatic-filters, freepascal, unzip

[Henry Jensen]

Hello Karl,

As I wrote, it needs improvement :-)

On Mon, 5 Sep 2011 21:26:20 GMT
address@hidden (Karl Berry) wrote:

> 1) That should be 
>         echo '/usr/bin/7z x "$@"' > /usr/bin/unzip
> ($@ only has its magical qualities inside "".)

Right.

> 2) As far as I can tell, there are numerous cmdline and other
>    differences between p7zip and unzip.  If that's so, I think it would
>    be better just to leave unzip as "command not found" than provide a
>    radically incompatible replacement.

It depends. I think it would be better to give the user a minimalistic
unzip that might be incompatible with Info-ZIPs unzip than none at all.
However, I created now a script that makes the unzip replacement a
little more compatible:

#!/bin/bash
Opts=""
cm="x"
while getopts plvtTZ opt
do
   case $opt in
       p) Opts="$Opts -so";;
       v|l) cm="l";;
         t) cm="t";;
       T|Z) ;;
       \?)break;;
   esac
done
shift $((OPTIND-1))
7z $cm $Opts "$@"

As you see, it now supports Info-ZIPs unzip syntax for listing and
testing archives and writing to stdout, -T and -Z are recognized but
ignored. 

But I hope as well, that the issue will be resolved. According to the
note in match.c the copyright statement refers to recmatch(), which
is part of Info-ZIPs unzip since ages.

At http://waterlan.home.xs4all.nl/README.txt I found following note
for wcd, which apparently uses recmatch() as well:


2.3 Recmatch

        I used the regular matching algorithm, recmatch(), of
        Info-Zip's unzip program.

        recmatch() was written by Mark Adler.

        Copyright (C) 1990-1992 Mark Adler, Richard B. Wales, Jean-loup
        Gailly, Kai Uwe Rommel and Igor Mandrichenko.

        Mark Adler (original Zip author; UnZip decompression; writer
        of recmatch() ) and Greg Roelofs (former UnZip
        maintainer/co-author) have given permission to me to
        distribute recmatch() (match.c,match.h) under the GNU General
        Public License conditions as long as there's some sort of
        comment included that indicates it came from Info-ZIP's
        UnZip/Zip and was written by Mark Adler.

           Info-ZIP's home WWW site is at:

           http://www.info-zip.org/

So it seems we should contact Mark Adler.

Regards,

Henry