#!/bin/sh
# sh is buggy on RS/6000 AIX 3.2. Replace above line with #!/bin/ksh

# Copyright (C) 1998, 2002, 2006, 2007, 2009 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 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.

bindir='/bin'
case $1 in
--__bindir) bindir=${2?}; shift; shift;;
esac
PATH=$bindir:$PATH

case "${0##*/}" in
  bz*) def_compr=bzip2 ;;
  lz*) def_compr=lzma  ;;
  xz*) def_compr=xz    ;;
  *)   def_compr=gzip  ;;
esac

case "${0##*/}" in
  *cmp) prog=cmp;  cmp='${CMP-cmp}'  ;;
  *)    prog=diff; cmp='${DIFF-diff}';;
esac

version="${0##*/} (gzip) 1.4
Copyright (C) 2007, 2009-2010 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: $0 [OPTION]... FILE1 [FILE2]
Compare FILE1 to FILE2, using their uncompressed contents if they are
compressed.  If FILE2 is omitted, compare FILE1 to the uncompressed
file FILE1 without compression suffix.  Do comparisons like '$prog' does.

OPTIONs are the same as for '$prog'.

Report bugs to <bug-gzip@gnu.org>."

# sed script to escape all ' for the shell, and then (to handle trailing
# newlines correctly) turn trailing X on last line into '.
escape='
  s/'\''/'\''\\'\'''\''/g
  $s/X$/'\''/
'

while :; do
  case $1 in
  --h*) printf '%s\n' "$usage" || exit 2; exit;;
  --v*) echo "$version" || exit 2; exit;;
  --) shift; break;;
  -*\'*) cmp="$cmp '"`printf '%sX\n' "$1" | sed "$escape"`;;
  -?*) cmp="$cmp '$1'";;
  *) break;;
  esac
  shift
done
cmp="$cmp --"

for file
do
  test "X$file" = X- || <"$file" || exit 2
done

gzip_status=0
exec 3>&1

guess_compr()
{
  case $2 in
  *[-.]bz2)
    eval $1=bzip2
    FILE="${2%[-.]bz2}";;
  *[-.]xz)
    eval $1=xz
    FILE="${2%[-.]xz}";;
  *[-.]lzma)
    eval $1=lzma
    FILE="${2%[-.]lzma}";;
  *[-.]gz*)
    eval $1=gzip
    FILE="${2%[-.]gz*}";;
  *[-.][zZ])
    eval $1=gzip
    FILE="${2%[-.][zZ]}";;
  *[-.]t[ga]z)
    eval $1=gzip
    FILE="${2%[-.]t[ga]z}";;
  -)
    eval $1=$def_compr
    FILE="$2";;
  *)
    eval $1=
    FILE="$2";;
  esac
}

if test $# -eq 1; then
  guess_compr compr "$1"
  if test "$1" = "$FILE"; then
    echo >&2 "$0: $1: unknown compressed file extension"
    exit 2
  fi
  gzip_status=$(
    exec 4>&1
    ($compr -cd -- "$1" 4>&-; echo $? >&4) 3>&- | eval "$cmp" - '"$FILE"' >&3
  )
elif test $# -eq 2; then
	guess_compr compr1 "$1"
	guess_compr compr2 "$2"
	if test -n "$compr1"; then
		if test -n "$compr2"; then
		    if test "$1$2" = --; then
			gzip_status=$(
			  exec 4>&1
			  ($compr1 -cdfq - 4>&-; echo $? >&4) 3>&- |
			    eval "$cmp" - - >&3
			)
		    elif
			# Reject Solaris 8's buggy /bin/bash 2.03.
			echo X |
			 (echo X | eval "$cmp" /dev/fd/5 - >/dev/null 2>&1) \
				5<&0
		    then
			gzip_status=$(
			  exec 4>&1
			  ($compr1 -cdfq -- "$1" 4>&-; echo $? >&4) 3>&- |
			    ( ($compr2 -cdfq -- "$2" 4>&-; echo $? >&4) 3>&- 5<&- </dev/null |
			       eval "$cmp" /dev/fd/5 - >&3) 5<&0
			)
			cmp_status=$?
			case $gzip_status in
			  *[1-9]*) gzip_status=1;;
			  *) gzip_status=0;;
			esac
			(exit $cmp_status)
		    else
			F=$prog
			tmp=
			trap '
			  test -n "$tmp" && rm -f "$tmp"
			  (exit 2); exit 2
			' HUP INT PIPE TERM 0
			if type mktemp >/dev/null 2>&1; then
			  tmp=`mktemp -t -- "$F.XXXXXX"` || exit 2
			else
			  set -C
			  tmp=${TMPDIR-/tmp}/$F.$$
			fi
			$compr2 -cdfq -- "$2" > "$tmp" || exit 2
			gzip_status=$(
			  exec 4>&1
			  ($compr1 -cdfq -- "$1" 4>&-; echo $? >&4) 3>&- |
			    eval "$cmp" - '"$tmp"' >&3
			)
                        cmp_status=$?
			rm -f "$tmp" || gzip_status=$?
			trap - HUP INT PIPE TERM 0
			(exit $cmp_status)
		    fi
	    else
		    gzip_status=$(
		      exec 4>&1
		      ($compr1 -cdfq -- "$1" 4>&-; echo $? >&4) 3>&- |
		        eval "$cmp" - '"$2"' >&3
		    )
	    fi
	else
		if test -n "$compr2"; then
			gzip_status=$(
			  exec 4>&1
			  ($compr2 -cdfq -- "$2" 4>&-; echo $? >&4) 3>&- |
			    eval "$cmp" '"$1"' - >&3
			)
		else
			eval "$cmp" '"$1"' '"$2"'
		fi
	fi
else
	echo >&2 "$0: invalid number of operands; try \`$0 --help' for help"
	exit 2
fi

cmp_status=$?
test "$gzip_status" -eq 0 || exit 2
exit $cmp_status
