codekingpro/portable-devtools

1#!/bin/sh2 3# Copyright (C) 1998, 2002, 2004, 2007, 2010-2025 Free Software Foundation,4# Inc.5# Copyright (C) 1993 Jean-loup Gailly6 7# This program is free software; you can redistribute it and/or modify8# it under the terms of the GNU General Public License as published by9# the Free Software Foundation; either version 3 of the License, or10# (at your option) any later version.11 12# This program is distributed in the hope that it will be useful,13# but WITHOUT ANY WARRANTY; without even the implied warranty of14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the15# GNU General Public License for more details.16 17# You should have received a copy of the GNU General Public License18# along with this program.  If not, see <https://www.gnu.org/licenses/>.19 20LC_ALL=C21export LC_ALL22 23version="znew (gzip) 1.1424Copyright (C) 2025 Free Software Foundation, Inc.25This is free software.  You may redistribute copies of it under the terms of26the GNU General Public License <https://www.gnu.org/licenses/gpl.html>.27There is NO WARRANTY, to the extent permitted by law.28 29Written by Jean-loup Gailly."30 31usage="Usage: $0 [OPTION]... [FILE]...32Recompress files from .Z (compress) format to .gz (gzip) format.33 34Options:35 36  -f     Force recompression even if a .gz file already exists.37  -t     Test the new files before deleting originals.38  -v     Verbose; display name and statistics for each file compressed.39  -9     Use the slowest compression method (optimal compression).40  -P     Use pipes for the conversion to reduce disk space usage.41  -K     Keep a .Z file when it is smaller than the .gz file; implies -t.42      --help     display this help and exit43      --version  output version information and exit44 45Report bugs to <bug-gzip@gnu.org>."46 47check=048pipe=049opt=50files=51keep=052res=053old=054new=055block=102456# block is the disk block size (best guess, need not be exact)57 58# Beware -s or --suffix in $GZIP, which could cause misbehavior59# in gzip 1.13 and earlier.60unset GZIP61ext=.gz62 63for arg64do65  case "$arg" in66  --help)      printf '%s\n' "$usage"   || exit 1; exit;;67  --version)   printf '%s\n' "$version" || exit 1; exit;;68  -*)     opt="$opt $arg"; shift;;69   *)     break;;70  esac71done72 73if test $# -eq 0; then74  echo >&2 "$0: invalid number of operands; try \`$0 --help' for help"75  exit 176fi77 78opt=`printf '%s\n' "$opt" | sed -e 's/ //g' -e 's/-//g'`79case "$opt" in80  *t*) check=1; opt=`printf '%s\n' "$opt" | sed 's/t//g'`81esac82case "$opt" in83  *K*) keep=1; check=1; opt=`printf '%s\n' "$opt" | sed 's/K//g'`84esac85case "$opt" in86  *P*) pipe=1; opt=`printf '%s\n' "$opt" | sed 's/P//g'`87esac88if test -n "$opt"; then89  opt="-$opt"90fi91 92for i do93  n=`printf '%s\n' "$i" | sed 's/.Z$//'`94  if test ! -f "$n.Z" ; then95    printf '%s\n' "$n.Z not found"96    res=1; continue97  fi98  test $keep -eq 1 && old=`wc -c < "$n.Z"`99  if test $pipe -eq 1; then100    if gzip -d < "$n.Z" | gzip $opt > "$n$ext"; then101      # Copy file attributes from old file to new one, if possible.102      touch -r"$n.Z" -- "$n$ext" 2>/dev/null103      chmod --reference="$n.Z" -- "$n$ext" 2>/dev/null104    else105      printf '%s\n' "error while recompressing $n.Z"106      res=1; continue107    fi108  else109    if test $check -eq 1; then110      if cp -p "$n.Z" "$n.$$"; then111        :112      else113        printf '%s\n' "cannot backup $n.Z"114        res=1; continue115      fi116    fi117    if gzip -d "$n.Z"; then118      :119    else120      test $check -eq 1 && mv "$n.$$" "$n.Z"121      printf '%s\n' "error while uncompressing $n.Z"122      res=1; continue123    fi124    if gzip $opt "$n"; then125      :126    else127      if test $check -eq 1; then128        mv "$n.$$" "$n.Z" && rm -f "$n"129        printf '%s\n' "error while recompressing $n"130      else131        # compress $n  (might be dangerous if disk full)132        printf '%s\n' "error while recompressing $n, left uncompressed"133      fi134      res=1; continue135    fi136  fi137  test $keep -eq 1 && new=`wc -c < "$n$ext"`138  if test $keep -eq 1 && test `expr \( $old + $block - 1 \) / $block` -lt \139                              `expr \( $new + $block - 1 \) / $block`; then140    if test $pipe -eq 1; then141      rm -f "$n$ext"142    else143      mv "$n.$$" "$n.Z" && rm -f "$n$ext"144    fi145    printf '%s\n' "$n.Z smaller than $n$ext -- unchanged"146 147  elif test $check -eq 1; then148    if gzip -t "$n$ext" ; then149      rm -f "$n.$$" "$n.Z"150    else151      test $pipe -eq 0 && mv "$n.$$" "$n.Z"152      rm -f "$n$ext"153      printf '%s\n' "error while testing $n$ext, $n.Z unchanged"154      res=1; continue155    fi156  elif test $pipe -eq 1; then157    rm -f "$n.Z"158  fi159done160exit $res161