mirror of
https://github.com/python/cpython.git
synced 2025-10-31 02:15:10 +00:00
78 lines
1.6 KiB
Python
Executable file
78 lines
1.6 KiB
Python
Executable file
# Conversions to/from base64 transport encoding as per RFC-MIME (Dec 1991
|
|
# version).
|
|
|
|
# Parameters set by RFX-XXXX.
|
|
#
|
|
# 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]), 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()
|