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Diffstat (limited to 'znew.in')
| -rw-r--r-- | znew.in | 157 |
1 files changed, 157 insertions, 0 deletions
@@ -0,0 +1,157 @@ +#!/bin/sh + +# Copyright (C) 1998, 2002, 2004, 2007, 2010-2016 Free Software Foundation, +# Inc. +# 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 3 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. + +version="znew (gzip) @VERSION@ +Copyright (C) 2010-2016 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 [OPTION]... [FILE]... +Recompress files from .Z (compress) format to .gz (gzip) format. + +Options: + + -f Force recompression even if a .gz file already exists. + -t Test the new files before deleting originals. + -v Verbose; display name and statistics for each file compressed. + -9 Use the slowest compression method (optimal compression). + -P Use pipes for the conversion to reduce disk space usage. + -K Keep a .Z file when it is smaller than the .gz file; implies -t. + --help display this help and exit + --version output version information and exit + +Report bugs to <bug-gzip@gnu.org>." + +check=0 +pipe=0 +opt= +files= +keep=0 +res=0 +old=0 +new=0 +block=1024 +# block is the disk block size (best guess, need not be exact) + +# Beware -s or --suffix in $GZIP. +unset GZIP +ext=.gz + +for arg +do + case "$arg" in + --help) exec echo "$usage";; + --version) exec echo "$version";; + -*) opt="$opt $arg"; shift;; + *) break;; + esac +done + +if test $# -eq 0; then + echo >&2 "$0: invalid number of operands; try \`$0 --help' for help" + exit 1 +fi + +opt=`echo "$opt" | sed -e 's/ //g' -e 's/-//g'` +case "$opt" in + *t*) check=1; opt=`echo "$opt" | sed 's/t//g'` +esac +case "$opt" in + *K*) keep=1; check=1; opt=`echo "$opt" | sed 's/K//g'` +esac +case "$opt" in + *P*) pipe=1; opt=`echo "$opt" | sed 's/P//g'` +esac +if test -n "$opt"; then + opt="-$opt" +fi + +for i do + n=`echo "$i" | sed 's/.Z$//'` + if test ! -f "$n.Z" ; then + echo "$n.Z not found" + res=1; continue + fi + test $keep -eq 1 && old=`wc -c < "$n.Z"` + if test $pipe -eq 1; then + if gzip -d < "$n.Z" | gzip $opt > "$n$ext"; then + # Copy file attributes from old file to new one, if possible. + touch -r"$n.Z" -- "$n$ext" 2>/dev/null + chmod --reference="$n.Z" -- "$n$ext" 2>/dev/null + else + echo "error while recompressing $n.Z" + res=1; continue + fi + else + if test $check -eq 1; then + if cp -p "$n.Z" "$n.$$"; then + : + else + echo "cannot backup $n.Z" + res=1; continue + fi + fi + if gzip -d "$n.Z"; then + : + else + test $check -eq 1 && mv "$n.$$" "$n.Z" + echo "error while uncompressing $n.Z" + res=1; continue + fi + if gzip $opt "$n"; then + : + else + if test $check -eq 1; then + mv "$n.$$" "$n.Z" && rm -f "$n" + echo "error while recompressing $n" + else + # compress $n (might be dangerous if disk full) + echo "error while recompressing $n, left uncompressed" + fi + res=1; continue + fi + fi + test $keep -eq 1 && new=`wc -c < "$n$ext"` + if test $keep -eq 1 && test `expr \( $old + $block - 1 \) / $block` -lt \ + `expr \( $new + $block - 1 \) / $block`; then + if test $pipe -eq 1; then + rm -f "$n$ext" + else + mv "$n.$$" "$n.Z" && rm -f "$n$ext" + fi + echo "$n.Z smaller than $n$ext -- unchanged" + + elif test $check -eq 1; then + if gzip -t "$n$ext" ; then + rm -f "$n.$$" "$n.Z" + else + test $pipe -eq 0 && mv "$n.$$" "$n.Z" + rm -f "$n$ext" + echo "error while testing $n$ext, $n.Z unchanged" + res=1; continue + fi + elif test $pipe -eq 1; then + rm -f "$n.Z" + fi +done +exit $res |