Mercurial > cpython-lru_cache-weakref

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

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents 38ef091964f0
children 2e3f244f105f
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1 # Various tools used by MIME-reading or MIME-writing programs.
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2
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3
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4 import os
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5 import rfc822
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6 import string
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7 import tempfile
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8
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9
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10 # A derived class of rfc822.Message that knows about MIME headers and
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11 # contains some hooks for decoding encoded and multipart messages.
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12
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13 class Message(rfc822.Message):
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15 def __init__(self, fp, seekable = 1):
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16 rfc822.Message.__init__(self, fp, seekable)
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17 self.encodingheader = \
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18 self.getheader('content-transfer-encoding')
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19 self.typeheader = \
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20 self.getheader('content-type')
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21 self.parsetype()
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22 self.parseplist()
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23
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24 def parsetype(self):
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25 str = self.typeheader
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26 if str == None:
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27 str = 'text/plain'
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28 if ';' in str:
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29 i = string.index(str, ';')
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30 self.plisttext = str[i:]
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31 str = str[:i]
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32 else:
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33 self.plisttext = ''
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34 fields = string.splitfields(str, '/')
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35 for i in range(len(fields)):
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36 fields[i] = string.lower(string.strip(fields[i]))
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37 self.type = string.joinfields(fields, '/')
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38 self.maintype = fields[0]
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39 self.subtype = string.joinfields(fields[1:], '/')
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40
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41 def parseplist(self):
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42 str = self.plisttext
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43 self.plist = []
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44 while str[:1] == ';':
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45 str = str[1:]
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46 if ';' in str:
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47 # XXX Should parse quotes!
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48 end = string.index(str, ';')
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49 else:
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50 end = len(str)
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51 f = str[:end]
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52 if '=' in f:
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53 i = string.index(f, '=')
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54 f = string.lower(string.strip(f[:i])) + \
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55 '=' + string.strip(f[i+1:])
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56 self.plist.append(string.strip(f))
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57 str = str[end:]
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58
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59 def getplist(self):
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60 return self.plist
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61
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62 def getparam(self, name):
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63 name = string.lower(name) + '='
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64 n = len(name)
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65 for p in self.plist:
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66 if p[:n] == name:
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67 return rfc822.unquote(p[n:])
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68 return None
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69
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70 def getparamnames(self):
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71 result = []
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72 for p in self.plist:
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73 i = string.find(p, '=')
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74 if i >= 0:
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75 result.append(string.lower(p[:i]))
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76 return result
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77
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78 def getencoding(self):
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79 if self.encodingheader == None:
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80 return '7bit'
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81 return string.lower(self.encodingheader)
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82
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83 def gettype(self):
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84 return self.type
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85
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86 def getmaintype(self):
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87 return self.maintype
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88
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89 def getsubtype(self):
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90 return self.subtype
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91
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93
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94
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95 # Utility functions
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96 # -----------------
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97
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98
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99 # Return a random string usable as a multipart boundary.
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100 # The method used is so that it is *very* unlikely that the same
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101 # string of characters will every occur again in the Universe,
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102 # so the caller needn't check the data it is packing for the
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103 # occurrence of the boundary.
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104 #
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105 # The boundary contains dots so you have to quote it in the header.
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106
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107 _prefix = None
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108
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109 def choose_boundary():
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110 global _prefix
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111 import time
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112 import rand
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113 if _prefix == None:
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114 import socket
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115 import os
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116 hostid = socket.gethostbyname(socket.gethostname())
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117 try:
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118 uid = `os.getuid()`
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119 except:
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120 uid = '1'
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121 try:
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122 pid = `os.getpid()`
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123 except:
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124 pid = '1'
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125 seed = `rand.rand()`
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126 _prefix = hostid + '.' + uid + '.' + pid
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127 timestamp = `int(time.time())`
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128 seed = `rand.rand()`
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129 return _prefix + '.' + timestamp + '.' + seed
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130
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131
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132 # Subroutines for decoding some common content-transfer-types
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133
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134 def decode(input, output, encoding):
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135 if encoding == 'base64':
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136 import base64
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137 return base64.decode(input, output)
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138 if encoding == 'quoted-printable':
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139 import quopri
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140 return quopri.decode(input, output)
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141 if encoding in ('uuencode', 'x-uuencode'):
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142 import uu
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143 return uu.decode(input, output)
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144 if decodetab.has_key(encoding):
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145 pipethrough(input, decodetab[encoding], output)
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146 else:
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147 raise ValueError, \
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148 'unknown Content-Transfer-Encoding: %s' % encoding
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149
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150 def encode(input, output, encoding):
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151 if encoding == 'base64':
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152 import base64
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153 return base64.encode(input, output)
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154 if encoding == 'quoted-printable':
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155 import quopri
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156 return quopri.encode(input, output, 0)
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157 if encoding in ('uuencode', 'x-uuencode'):
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158 import uu
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159 return uu.encode(input, output)
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160 if encodetab.has_key(encoding):
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161 pipethrough(input, encodetab[encoding], output)
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162 else:
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163 raise ValueError, \
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164 'unknown Content-Transfer-Encoding: %s' % encoding
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165
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166 # The following is no longer used for standard encodings
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167
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168 # XXX This requires that uudecode and mmencode are in $PATH
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169
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170 uudecode_pipe = '''(
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171 TEMP=/tmp/@uu.$$
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172 sed "s%^begin [0-7][0-7]* .*%begin 600 $TEMP%" | uudecode
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173 cat $TEMP
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174 rm $TEMP
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175 )'''
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176
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177 decodetab = {
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178 'uuencode': uudecode_pipe,
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179 'x-uuencode': uudecode_pipe,
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180 'quoted-printable': 'mmencode -u -q',
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181 'base64': 'mmencode -u -b',
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182 }
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183
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184 encodetab = {
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185 'x-uuencode': 'uuencode tempfile',
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186 'uuencode': 'uuencode tempfile',
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187 'quoted-printable': 'mmencode -q',
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188 'base64': 'mmencode -b',
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189 }
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190
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191 def pipeto(input, command):
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192 pipe = os.popen(command, 'w')
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193 copyliteral(input, pipe)
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194 pipe.close()
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195
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196 def pipethrough(input, command, output):
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197 tempname = tempfile.mktemp()
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198 try:
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199 temp = open(tempname, 'w')
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200 except IOError:
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201 print '*** Cannot create temp file', `tempname`
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202 return
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203 copyliteral(input, temp)
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204 temp.close()
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205 pipe = os.popen(command + ' <' + tempname, 'r')
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206 copybinary(pipe, output)
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207 pipe.close()
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208 os.unlink(tempname)
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209
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210 def copyliteral(input, output):
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211 while 1:
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212 line = input.readline()
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213 if not line: break
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214 output.write(line)
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215
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216 def copybinary(input, output):
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217 BUFSIZE = 8192
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218 while 1:
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219 line = input.read(BUFSIZE)
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220 if not line: break
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221 output.write(line)