Mercurial > cpython-lru_cache-weakref

annotate Lib/xdrlib.py @ 65035:87f4b32905df 2.7

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Cosmetic fix to use print function.
author Hirokazu Yamamoto <ocean-city@m2.ccsnet.ne.jp>
date Fri, 01 Oct 2010 10:48:47 +0000
parents d800d6737556
children d3f9a6d7f6e4 6b18a095c2e7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """Implements (a subset of) Sun XDR -- eXternal Data Representation.
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2
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3 See: RFC 1014
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4
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5 """
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6
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7 import struct
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8 try:
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9 from cStringIO import StringIO as _StringIO
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10 except ImportError:
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11 from StringIO import StringIO as _StringIO
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12
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13 __all__ = ["Error", "Packer", "Unpacker", "ConversionError"]
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14
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15 # exceptions
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16 class Error(Exception):
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17 """Exception class for this module. Use:
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18
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19 except xdrlib.Error, var:
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20 # var has the Error instance for the exception
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21
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22 Public ivars:
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23 msg -- contains the message
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24
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25 """
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26 def __init__(self, msg):
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27 self.msg = msg
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28 def __repr__(self):
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29 return repr(self.msg)
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30 def __str__(self):
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31 return str(self.msg)
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33
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34 class ConversionError(Error):
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35 pass
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37
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38
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39 class Packer:
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40 """Pack various data representations into a buffer."""
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41
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42 def __init__(self):
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43 self.reset()
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44
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45 def reset(self):
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46 self.__buf = _StringIO()
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47
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48 def get_buffer(self):
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49 return self.__buf.getvalue()
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50 # backwards compatibility
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51 get_buf = get_buffer
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52
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53 def pack_uint(self, x):
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54 self.__buf.write(struct.pack('>L', x))
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55
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56 pack_int = pack_uint
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57 pack_enum = pack_int
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58
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59 def pack_bool(self, x):
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60 if x: self.__buf.write('\0\0\0\1')
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61 else: self.__buf.write('\0\0\0\0')
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62
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63 def pack_uhyper(self, x):
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64 self.pack_uint(x>>32 & 0xffffffffL)
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65 self.pack_uint(x & 0xffffffffL)
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66
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67 pack_hyper = pack_uhyper
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68
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69 def pack_float(self, x):
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70 try: self.__buf.write(struct.pack('>f', x))
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71 except struct.error, msg:
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72 raise ConversionError, msg
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73
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74 def pack_double(self, x):
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75 try: self.__buf.write(struct.pack('>d', x))
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76 except struct.error, msg:
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77 raise ConversionError, msg
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78
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79 def pack_fstring(self, n, s):
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80 if n < 0:
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81 raise ValueError, 'fstring size must be nonnegative'
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82 data = s[:n]
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83 n = ((n+3)//4)*4
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84 data = data + (n - len(data)) * '\0'
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85 self.__buf.write(data)
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86
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87 pack_fopaque = pack_fstring
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88
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89 def pack_string(self, s):
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90 n = len(s)
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91 self.pack_uint(n)
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92 self.pack_fstring(n, s)
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93
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94 pack_opaque = pack_string
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95 pack_bytes = pack_string
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96
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97 def pack_list(self, list, pack_item):
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98 for item in list:
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99 self.pack_uint(1)
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100 pack_item(item)
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101 self.pack_uint(0)
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102
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103 def pack_farray(self, n, list, pack_item):
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104 if len(list) != n:
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105 raise ValueError, 'wrong array size'
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106 for item in list:
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107 pack_item(item)
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108
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109 def pack_array(self, list, pack_item):
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110 n = len(list)
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111 self.pack_uint(n)
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112 self.pack_farray(n, list, pack_item)
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114
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115
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116 class Unpacker:
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117 """Unpacks various data representations from the given buffer."""
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118
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119 def __init__(self, data):
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120 self.reset(data)
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121
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122 def reset(self, data):
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123 self.__buf = data
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124 self.__pos = 0
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125
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126 def get_position(self):
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127 return self.__pos
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128
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129 def set_position(self, position):
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130 self.__pos = position
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131
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6f1a120ae9c0 Unpacker.get_buffer(): new method to access the internal buffer of data
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132 def get_buffer(self):
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133 return self.__buf
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Barry Warsaw <barry@python.org>
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134
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135 def done(self):
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136 if self.__pos < len(self.__buf):
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137 raise Error('unextracted data remains')
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138
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139 def unpack_uint(self):
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140 i = self.__pos
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141 self.__pos = j = i+4
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142 data = self.__buf[i:j]
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143 if len(data) < 4:
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144 raise EOFError
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145 x = struct.unpack('>L', data)[0]
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146 try:
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147 return int(x)
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148 except OverflowError:
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149 return x
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150
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151 def unpack_int(self):
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152 i = self.__pos
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153 self.__pos = j = i+4
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154 data = self.__buf[i:j]
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155 if len(data) < 4:
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156 raise EOFError
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157 return struct.unpack('>l', data)[0]
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158
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159 unpack_enum = unpack_int
34632
77b57087fe45 Patch #1049151: adding bool support to xdrlib.py.
Martin v. Löwis <martin@v.loewis.de>
parents: 31515
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160
77b57087fe45 Patch #1049151: adding bool support to xdrlib.py.
Martin v. Löwis <martin@v.loewis.de>
parents: 31515
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161 def unpack_bool(self):
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162 return bool(self.unpack_int())
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163
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164 def unpack_uhyper(self):
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165 hi = self.unpack_uint()
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166 lo = self.unpack_uint()
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167 return long(hi)<<32 | lo
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168
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169 def unpack_hyper(self):
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170 x = self.unpack_uhyper()
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171 if x >= 0x8000000000000000L:
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172 x = x - 0x10000000000000000L
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173 return x
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174
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175 def unpack_float(self):
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176 i = self.__pos
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177 self.__pos = j = i+4
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178 data = self.__buf[i:j]
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179 if len(data) < 4:
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180 raise EOFError
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181 return struct.unpack('>f', data)[0]
4860
5c6fbdc50e1d Use the new struct module's ability to pack and unpack standardized
Guido van Rossum <guido@python.org>
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diff changeset
182
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183 def unpack_double(self):
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184 i = self.__pos
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185 self.__pos = j = i+8
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186 data = self.__buf[i:j]
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187 if len(data) < 8:
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188 raise EOFError
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189 return struct.unpack('>d', data)[0]
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190
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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191 def unpack_fstring(self, n):
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192 if n < 0:
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193 raise ValueError, 'fstring size must be nonnegative'
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194 i = self.__pos
37278
bb1b48516131 Make xdrlib use floor division instead of classic division.
Georg Brandl <georg@python.org>
parents: 35656
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195 j = i + (n+3)//4*4
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196 if j > len(self.__buf):
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197 raise EOFError
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198 self.__pos = j
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199 return self.__buf[i:i+n]
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200
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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201 unpack_fopaque = unpack_fstring
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202
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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203 def unpack_string(self):
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204 n = self.unpack_uint()
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diff changeset
205 return self.unpack_fstring(n)
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parents:
diff changeset
206
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
207 unpack_opaque = unpack_string
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Guido van Rossum <guido@python.org>
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208 unpack_bytes = unpack_string
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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parents:
diff changeset
209
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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210 def unpack_list(self, unpack_item):
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211 list = []
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diff changeset
212 while 1:
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213 x = self.unpack_uint()
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diff changeset
214 if x == 0: break
15543
785155e2cfca Update the code to better reflect recommended style:
Fred Drake <fdrake@acm.org>
parents: 7755
diff changeset
215 if x != 1:
31515
71a294bd7950 Replace backticks with repr() or "%r"
Walter Dörwald <walter@livinglogic.de>
parents: 28089
diff changeset
216 raise ConversionError, '0 or 1 expected, got %r' % (x,)
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217 item = unpack_item()
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diff changeset
218 list.append(item)
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diff changeset
219 return list
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parents:
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220
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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parents:
diff changeset
221 def unpack_farray(self, n, unpack_item):
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diff changeset
222 list = []
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diff changeset
223 for i in range(n):
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diff changeset
224 list.append(unpack_item())
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diff changeset
225 return list
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parents:
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226
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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parents:
diff changeset
227 def unpack_array(self, unpack_item):
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228 n = self.unpack_uint()
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parents: 5665
diff changeset
229 return self.unpack_farray(n, unpack_item)