Mercurial > cpython-lru_cache-weakref

annotate Lib/base64.py @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents 3c6db7165bc3
children ecdd4b468626
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1 #! /usr/bin/env python
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2
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3 # Conversions to/from base64 transport encoding as per RFC-MIME (Dec 1991
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4 # version).
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5
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6 # Parameters set by RFX-1421.
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7 #
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8 # Modified 04-Oct-95 by Jack to use binascii module
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9
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10 import binascii
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11
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12 MAXLINESIZE = 76 # Excluding the CRLF
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13 MAXBINSIZE = (MAXLINESIZE/4)*3
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14
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15 # Encode a file.
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16 def encode(input, output):
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17 while 1:
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18 s = input.read(MAXBINSIZE)
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19 if not s: break
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20 while len(s) < MAXBINSIZE:
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21 ns = input.read(MAXBINSIZE-len(s))
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22 if not ns: break
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23 s = s + ns
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24 line = binascii.b2a_base64(s)
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25 output.write(line)
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26
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27 # Decode a file.
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28 def decode(input, output):
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29 while 1:
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30 line = input.readline()
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31 if not line: break
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32 s = binascii.a2b_base64(line)
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33 output.write(s)
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34
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35 def encodestring(s):
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36 import StringIO
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37 f = StringIO.StringIO(s)
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38 g = StringIO.StringIO()
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39 encode(f, g)
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40 return g.getvalue()
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41
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42 def decodestring(s):
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43 import StringIO
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44 f = StringIO.StringIO(s)
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45 g = StringIO.StringIO()
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46 decode(f, g)
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47 return g.getvalue()
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48
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49 # Small test program
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50 def test():
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51 import sys, getopt
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52 try:
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53 opts, args = getopt.getopt(sys.argv[1:], 'deut')
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54 except getopt.error, msg:
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55 sys.stdout = sys.stderr
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56 print msg
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57 print """usage: basd64 [-d] [-e] [-u] [-t] [file|-]
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58 -d, -u: decode
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59 -e: encode (default)
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60 -t: decode string 'Aladdin:open sesame'"""
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61 sys.exit(2)
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62 func = encode
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63 for o, a in opts:
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64 if o == '-e': func = encode
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65 if o == '-d': func = decode
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66 if o == '-u': func = decode
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67 if o == '-t': test1(); return
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68 if args and args[0] != '-':
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69 func(open(args[0], 'rb'), sys.stdout)
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70 else:
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71 func(sys.stdin, sys.stdout)
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72
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73 def test1():
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74 s0 = "Aladdin:open sesame"
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75 s1 = encodestring(s0)
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76 s2 = decodestring(s1)
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77 print s0, `s1`, s2
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78
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79 if __name__ == '__main__':
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80 test()