Mercurial > cpython-lru_cache-weakref

annotate Lib/base64.py @ 25838:8540887bcec6 2.2

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Backport of 2.183: Fix memory leak in add_subclass() found by NealN with valgrind.
author Guido van Rossum <guido@python.org>
date Fri, 18 Oct 2002 13:42:21 +0000
parents 3716b116fb31
children 3cc0d8fd4e2b
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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-1521."""
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4
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5 # Modified 04-Oct-95 by Jack to use binascii module
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6
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7 import binascii
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8
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9 __all__ = ["encode","decode","encodestring","decodestring"]
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10
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11 MAXLINESIZE = 76 # Excluding the CRLF
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12 MAXBINSIZE = (MAXLINESIZE//4)*3
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13
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14 def encode(input, output):
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15 """Encode a file."""
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16 while 1:
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17 s = input.read(MAXBINSIZE)
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18 if not s: break
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19 while len(s) < MAXBINSIZE:
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20 ns = input.read(MAXBINSIZE-len(s))
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21 if not ns: break
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22 s = s + ns
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23 line = binascii.b2a_base64(s)
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24 output.write(line)
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25
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26 def decode(input, output):
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27 """Decode a file."""
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28 while 1:
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29 line = input.readline()
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30 if not line: break
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31 s = binascii.a2b_base64(line)
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32 output.write(s)
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33
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34 def encodestring(s):
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35 """Encode a string."""
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36 pieces = []
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37 for i in range(0, len(s), MAXBINSIZE):
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38 chunk = s[i : i + MAXBINSIZE]
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39 pieces.append(binascii.b2a_base64(chunk))
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40 return "".join(pieces)
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41
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42 def decodestring(s):
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43 """Decode a string."""
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44 return binascii.a2b_base64(s)
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45
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46 def test():
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47 """Small test program"""
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48 import sys, getopt
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49 try:
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50 opts, args = getopt.getopt(sys.argv[1:], 'deut')
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51 except getopt.error, msg:
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52 sys.stdout = sys.stderr
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53 print msg
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54 print """usage: %s [-d|-e|-u|-t] [file|-]
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55 -d, -u: decode
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56 -e: encode (default)
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57 -t: encode and decode string 'Aladdin:open sesame'"""%sys.argv[0]
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58 sys.exit(2)
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59 func = encode
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60 for o, a in opts:
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61 if o == '-e': func = encode
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62 if o == '-d': func = decode
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63 if o == '-u': func = decode
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64 if o == '-t': test1(); return
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65 if args and args[0] != '-':
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66 func(open(args[0], 'rb'), sys.stdout)
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67 else:
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68 func(sys.stdin, sys.stdout)
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70 def test1():
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71 s0 = "Aladdin:open sesame"
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72 s1 = encodestring(s0)
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73 s2 = decodestring(s1)
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74 print s0, `s1`, s2
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76 if __name__ == '__main__':
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77 test()