#! /usr/bin/env python """Conversions to/from base64 transport encoding as per RFC-1521.""" # Modified 04-Oct-95 by Jack to use binascii module import binascii __all__ = ["encode","decode","encodestring","decodestring"] MAXLINESIZE = 76 # Excluding the CRLF MAXBINSIZE = (MAXLINESIZE/4)*3 def encode(input, output): """Encode a file.""" while 1: s = input.read(MAXBINSIZE) if not s: break while len(s) < MAXBINSIZE: ns = input.read(MAXBINSIZE-len(s)) if not ns: break s = s + ns line = binascii.b2a_base64(s) output.write(line) def decode(input, output): """Decode a file.""" while 1: line = input.readline() if not line: break s = binascii.a2b_base64(line) output.write(s) def encodestring(s): """Encode a string.""" import StringIO f = StringIO.StringIO(s) g = StringIO.StringIO() encode(f, g) return g.getvalue() def decodestring(s): """Decode a string.""" import StringIO f = StringIO.StringIO(s) g = StringIO.StringIO() decode(f, g) return g.getvalue() def test(): """Small test program""" import sys, getopt try: opts, args = getopt.getopt(sys.argv[1:], 'deut') except getopt.error, msg: sys.stdout = sys.stderr print msg print """usage: %s [-d|-e|-u|-t] [file|-] -d, -u: decode -e: encode (default) -t: encode and decode string 'Aladdin:open sesame'"""%sys.argv[0] sys.exit(2) func = encode for o, a in opts: if o == '-e': func = encode if o == '-d': func = decode if o == '-u': func = decode if o == '-t': test1(); return if args and args[0] != '-': func(open(args[0], 'rb'), sys.stdout) else: func(sys.stdin, sys.stdout) def test1(): s0 = "Aladdin:open sesame" s1 = encodestring(s0) s2 = decodestring(s1) print s0, `s1`, s2 if __name__ == '__main__': test()