#!/usr/bin/python
'''Base64 encoder and decoder.

usage: b64 -d/-e [file]

Base64 string does not include linefeed.
'''
#
# Copyright (c) 2006 Satoshi Fukutomi <info@fuktommy.com>.
# 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.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``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 AUTHORS OR 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.
#

import sys
import base64

def usage():
    sys.exit('usage: b64 -d/-e [file]')


def main():
    try:
        flag = sys.argv[1]
        if flag == '-d':
            mode = 'decode'
        elif flag == '-e':
            mode = 'encode'
        else:
            usage()
        if len(sys.argv) > 2:
            input = file(sys.argv[2], 'rb')
        else:
            input = sys.stdin
    except IndexError:
        usage()

    if mode == 'decode':
        base64.decode(input, sys.stdout)
    else:
        sys.stdout.write(base64.b64encode(input.read()).replace('\n', ''))
        sys.stdout.write('\n')

if __name__ == '__main__':
    main()