#!/bin/bash
## isoread.sh
## Read only the valid portions of an ISO image from a CD disc
## by parsing the isoinfo output and passing that to a suitable dd
## command
## (c) 2005 James T. Dennis: Published under the BSD Licence

which isoinfo || { echo "isoinfo not found?" 1>&2; exit 1; }
which dd || { echo "dd not found???" 1>&2; exit 127; }
which tr || { echo "tr not found???" 1>&2; exit 127; }
which egrep || { echo "egrep not found???" 1>&2; exit 127; }

eval $(isoinfo -d -i "$1"  2>/dev/null |
         egrep "block[ ]*size|olume[ ]*size" |
         { IFS=":"; read x bs; read x vsize; echo "bs=$bs ; vsize=$vsize" |
	     tr -d " "; })

[ -z "$bs" -o -z "$vsize" ] && {
	echo "Error getting isoinfo $1?" 1>&2; exit 1; }

cmd="dd conv=notrunc,noerror if=$1 bs=$bs count=$vsize"
echo "$cmd" 1>&2
$cmd