#!/bin/bash

# *****************************************************************

# file: base64.sh

# date: 2007-11-01 13:00

# author: Marko Schulz - <info@tuxnet24.de>

# description: convert string whith base64.

# *****************************************************************

#

# 

# SYNOPSIS

#

# This program action encode a logo.png (binary) to STDOUT (in this case to logo64.txt)

# tux@earth:~$ ./base64.sh -a encode -f ./logo.png > logo64.txt

#

# This program action decode a logo64.txt (ASCII) to STDOUT (in this case to logo.png)

# tux@earth:~$ ./base64.sh -a decode -f ./logo64.txt > logo.png

#

#

# *****************************************************************

# This function display error and usage and end this program...

function f_alert() {

local error=$1

echo -e "\n$( basename $0): convert string whith base64\n"

[ -n "$error" ] && echo -e "\a${error}\n"

echo -e "Usage: $( basename $0 ) -a {encode|decode} -f </PATH/TO/FILE> [ -h ]\n"

echo -e "\t-a the action for ecode or decode"

echo -e "\t-f path to fie name"

echo -e "\t-h display this screen\n"

exit 1

}

# *****************************************************************

# get the cmd arguments...

while getopts f:a:h Optionen 2>/dev/null; do

    case $Optionen in

        f) pFile=$OPTARG  ;;

        a) pAction=$OPTARG ;;

        h) f_alert ;;

        *) f_alert "ERROR: Invalid argument" ;;

    esac

done

# *****************************************************************

# program action...

# error if no file defined...

[ ! -f "$pFile" ] && f_alert "ERROR: No input file defined"

case "$pAction" in

	encode)

		perl -MMIME::Base64 -0777 -ne 'print encode_base64($_)' < $pFile

	;;

	decode)

		perl -MMIME::Base64 -0777 -ne 'print decode_base64($_)' < $pFile

	;;

	*)

		f_alert "ERROR: Invalid argument for action"

	;;

esac

# *****************************************************************

# EOF