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- #! /usr/bin/env python
-
- # Conversions to/from base64 transport encoding as per RFC-MIME (Dec 1991
- # version).
-
- # Parameters set by RFC-1421.
- #
- # Modified 04-Oct-95 by Jack to use binascii module
-
- import binascii
-
- MAXLINESIZE = 76 # Excluding the CRLF
- MAXBINSIZE = (MAXLINESIZE/4)*3
-
- # Encode a file.
- def encode(input, output):
- 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)
-
- # Decode a file.
- def decode(input, output):
- while 1:
- line = input.readline()
- if not line: break
- s = binascii.a2b_base64(line)
- output.write(s)
-
- def encodestring(s):
- import StringIO
- f = StringIO.StringIO(s)
- g = StringIO.StringIO()
- encode(f, g)
- return g.getvalue()
-
- def decodestring(s):
- import StringIO
- f = StringIO.StringIO(s)
- g = StringIO.StringIO()
- decode(f, g)
- return g.getvalue()
-
- # Small test program
- def test():
- import sys, getopt
- try:
- opts, args = getopt.getopt(sys.argv[1:], 'deut')
- except getopt.error, msg:
- sys.stdout = sys.stderr
- print msg
- print """usage: basd64 [-d] [-e] [-u] [-t] [file|-]
- -d, -u: decode
- -e: encode (default)
- -t: decode string 'Aladdin:open sesame'"""
- 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()
-