#!/bin/sh
# genmd5.sh: Simple posixish md5 generator wrapper
#
# Copyright (c) 1999, 2000, 2001, 2002 Jason R Fink
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#      This product includes software developed by Jason R Fink
# 4. The name of the Author may not be used to endorse or promote products
#    derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY JASON R FINK OF IPSOS-ASI INC,
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
# 
# require: md5 in $PATH
# exit:    on return value
#############################################################################

progname=${0##*/}
toppid=$$
trap "exit 1" 1 2 3 15

bomb()
{
        cat >&2 <<ERRORMESSAGE

ERROR: $@
*** ${progname} aborted! ***
ERRORMESSAGE
        kill ${toppid}
        exit 1
}

DoGen()
{
	if [ $3 -ne "0" ]; then
		md5 $1 > $2 || bomb "Could not gen md5 for ${1}"
	else
		md5 $1 | awk '{print $4}' > $2 || bomb "Could not gen md5 for ${1}"
	fi
}

Usage()
{
	cat <<__usage__
Usage: ${progname} [-f file-to-use] [-F]
Arguments:
    -f The file to get a signature from
    -o Output file (md5 is the default
Flags:"
    -F Create a signature using all of md5 output
__usage__
}

# Main()
FULLMD5FILE=0
OUTFILE="md5"
while [ "$#" -gt "0" ]
do
	case $1 in
		-F)
			FULLMD5FILE=1
			;;
		-f)
			shift
			SRCFILE=$1
			;;
		-o)
			shift
			OUTFILE=$1
			;;
		-usage)
			Usage
			exit 0
			;;
		*)
			echo "Syntax Error"
			Usage
			exit 1
			;;
	esac
	shift
done

DoGen $SRCFILE $OUTFILE $FULLMD5FILE

exit 0