source: bootcd/isolinux/syslinux-6.03/utils/bin2hex.pl

#!/usr/bin/perl
## -----------------------------------------------------------------------
##
##   Copyright 2003-2008 H. Peter Anvin - All Rights Reserved
##
##   Permission is hereby granted, free of charge, to any person
##   obtaining a copy of this software and associated documentation
##   files (the "Software"), to deal in the Software without
##   restriction, including without limitation the rights to use,
##   copy, modify, merge, publish, distribute, sublicense, and/or
##   sell copies of the Software, and to permit persons to whom
##   the Software is furnished to do so, subject to the following
##   conditions:
##
##   The above copyright notice and this permission notice shall
##   be included in all copies or substantial portions of the Software.
##
##   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
##   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
##   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
##   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
##   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
##   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
##   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
##   OTHER DEALINGS IN THE SOFTWARE.
##
## -----------------------------------------------------------------------

eval { use bytes; };
eval { binmode STDIN; };

$len = 0;
while ( read(STDIN,$ch,1) ) {
    $cc = ord($ch);
    $s = sprintf("%x", $cc);
    print $s;
    $len += length($s);
    if ( $len > 72 ) {
        print "\n";
        $len = 0;
    } else {
        print " ";
        $len++;
    }
}
print "\n" if ( $len );
print "*\n";
exit 0;