Mercurial > cpython-lru_cache-weakref

annotate Lib/quopri.py @ 4566:6403c94de50d legacy-trunk

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Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents 56dba037b8d6
children 4579a7701949
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # Conversions to/from quoted-printable transport encoding as per RFC-XXXX
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2 # (Dec 1991 version).
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3
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4 ESCAPE = '='
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5 MAXLINESIZE = 76
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6 HEX = '0123456789ABCDEF'
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7
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8 def needsquoting(c, quotetabs):
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9 if c == '\t':
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10 return not quotetabs
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11 return c == ESCAPE or not(' ' <= c <= '~')
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12
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13 def quote(c):
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14 if c == ESCAPE:
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15 return ESCAPE * 2
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16 else:
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17 i = ord(c)
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18 return ESCAPE + HEX[i/16] + HEX[i%16]
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19
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20 def encode(input, output, quotetabs):
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21 while 1:
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22 line = input.readline()
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23 if not line: break
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24 new = ''
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25 last = line[-1:]
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26 if last == '\n': line = line[:-1]
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27 else: last = ''
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28 prev = ''
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29 for c in line:
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30 if needsquoting(c, quotetabs):
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31 c = quote(c)
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32 if len(new) + len(c) >= MAXLINESIZE:
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33 output.write(new + ESCAPE + '\n')
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34 new = ''
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35 new = new + c
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36 prev = c
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37 if prev in (' ', '\t'):
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38 output.write(new + ESCAPE + '\n\n')
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39 else:
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40 output.write(new + '\n')
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41
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42 def decode(input, output):
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43 new = ''
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44 while 1:
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45 line = input.readline()
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46 if not line: break
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47 i, n = 0, len(line)
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48 if n > 0 and line[n-1] == '\n':
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49 partial = 0; n = n-1
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50 # Strip trailing whitespace
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51 while n > 0 and line[n-1] in (' ', '\t'):
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52 n = n-1
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53 else:
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54 partial = 1
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55 while i < n:
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56 c = line[i]
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57 if c <> ESCAPE:
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58 new = new + c; i = i+1
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59 elif i+1 == n and not partial:
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60 partial = 1; break
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61 elif i+1 < n and line[i+1] == ESCAPE:
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62 new = new + ESCAPE; i = i+2
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63 elif i+2 < n and ishex(line[i+1]) and ishex(line[i+2]):
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64 new = new + chr(unhex(line[i+1:i+3])); i = i+3
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65 else: # Bad escape sequence -- leave it in
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66 new = new + c; i = i+1
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67 if not partial:
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68 output.write(new + '\n')
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69 new = ''
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70 if new:
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71 output.write(new)
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72
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73 def ishex(c):
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74 return '0' <= c <= '9' or 'a' <= c <= 'f' or 'A' <= c <= 'F'
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75
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76 def unhex(s):
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77 bits = 0
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78 for c in s:
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79 if '0' <= c <= '9':
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80 i = ord('0')
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81 elif 'a' <= c <= 'f':
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82 i = ord('a')-10
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83 elif 'A' <= c <= 'F':
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84 i = ord('A')-10
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85 else:
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86 break
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87 bits = bits*16 + (ord(c) - i)
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88 return bits
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89
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90 def test():
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91 import sys
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92 import getopt
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93 try:
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94 opts, args = getopt.getopt(sys.argv[1:], 'td')
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95 except getopt.error, msg:
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96 sys.stdout = sys.stderr
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97 print msg
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98 print "usage: quopri [-t | -d] [file] ..."
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99 print "-t: quote tabs"
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100 print "-d: decode; default encode"
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101 sys.exit(2)
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102 deco = 0
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103 tabs = 0
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104 for o, a in opts:
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105 if o == '-t': tabs = 1
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106 if o == '-d': deco = 1
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107 if tabs and deco:
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108 sys.stdout = sys.stderr
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109 print "-t and -d are mutually exclusive"
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110 sys.exit(2)
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111 if not args: args = ['-']
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112 sts = 0
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113 for file in args:
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114 if file == '-':
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115 fp = sys.stdin
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116 else:
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117 try:
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118 fp = open(file)
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119 except IOError, msg:
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120 sys.stderr.write("%s: can't open (%s)\n" % (file, msg))
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121 sts = 1
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122 continue
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123 if deco:
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124 decode(fp, sys.stdout)
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125 else:
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126 encode(fp, sys.stdout, tabs)
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127 if fp is not sys.stdin:
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128 fp.close()
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129 if sts:
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130 sys.exit(sts)
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131
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132 if __name__ == '__main__':
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133 test()