#!/bin/sh
# zforce: force a gz extension on all gzip files so that gzip will not
# compress them twice.
#
# This can be useful for files with names truncated after a file transfer.
# 12345678901234 is renamed to 12345678901.gz


# Copyright (C) 2002, 2007 Free Software Foundation
# Copyright (C) 1993 Jean-loup Gailly

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

PATH="${GZIP_BINDIR-'/bin'}:$PATH"; export PATH

version="zforce (gzip) 1.3.12
Copyright (C) 2007 Free Software Foundation, Inc.
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."

usage="Usage: $0 [FILE]...
Force a .gz extension on all compressed FILEs so that gzip will
not compress them twice.

Report bugs to <[email protected]>."

if test $# = 0; then
echo "$usage" >&2
exit 1
fi

res=0
for i do
case "$i" in
--h*) exec echo "$usage";;
--v*) exec echo "$version";;
*[-.]z | *[-.]gz | *.t[ag]z) continue;;
esac

if test ! -f "$i" ; then
echo zforce: $i not a file
res=1
continue
fi

if gzip -l < "$i" 2>/dev/null | grep '^\s\+compressed' > /dev/null; then

new="$i.gz"
if mv "$i" "$new"; then
echo $i -- replaced with $new
else
res=$?
fi
fi
done
exit $res