Mercurial > cpython-lru_cache-weakref

annotate Lib/xdrlib.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents d3f9a6d7f6e4
children
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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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32
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33
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34 class ConversionError(Error):
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35 pass
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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 def pack_int(self, x):
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57 self.__buf.write(struct.pack('>l', x))
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58
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59 pack_enum = pack_int
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60
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61 def pack_bool(self, x):
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62 if x: self.__buf.write('\0\0\0\1')
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63 else: self.__buf.write('\0\0\0\0')
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64
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65 def pack_uhyper(self, x):
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66 self.pack_uint(x>>32 & 0xffffffffL)
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67 self.pack_uint(x & 0xffffffffL)
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68
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69 pack_hyper = pack_uhyper
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70
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71 def pack_float(self, x):
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72 try: self.__buf.write(struct.pack('>f', x))
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73 except struct.error, msg:
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74 raise ConversionError, msg
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75
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76 def pack_double(self, x):
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77 try: self.__buf.write(struct.pack('>d', x))
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78 except struct.error, msg:
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79 raise ConversionError, msg
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80
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81 def pack_fstring(self, n, s):
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82 if n < 0:
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83 raise ValueError, 'fstring size must be nonnegative'
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84 data = s[:n]
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85 n = ((n+3)//4)*4
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86 data = data + (n - len(data)) * '\0'
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87 self.__buf.write(data)
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88
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89 pack_fopaque = pack_fstring
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90
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91 def pack_string(self, s):
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92 n = len(s)
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93 self.pack_uint(n)
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94 self.pack_fstring(n, s)
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95
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96 pack_opaque = pack_string
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97 pack_bytes = pack_string
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98
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99 def pack_list(self, list, pack_item):
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100 for item in list:
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101 self.pack_uint(1)
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102 pack_item(item)
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103 self.pack_uint(0)
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104
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105 def pack_farray(self, n, list, pack_item):
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106 if len(list) != n:
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107 raise ValueError, 'wrong array size'
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108 for item in list:
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109 pack_item(item)
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110
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111 def pack_array(self, list, pack_item):
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112 n = len(list)
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113 self.pack_uint(n)
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114 self.pack_farray(n, list, pack_item)
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115
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116
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117
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118 class Unpacker:
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119 """Unpacks various data representations from the given buffer."""
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120
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121 def __init__(self, data):
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122 self.reset(data)
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123
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124 def reset(self, data):
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125 self.__buf = data
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126 self.__pos = 0
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127
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128 def get_position(self):
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129 return self.__pos
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130
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131 def set_position(self, position):
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132 self.__pos = position
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133
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134 def get_buffer(self):
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135 return self.__buf
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Barry Warsaw <barry@python.org>
parents: 4450
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136
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137 def done(self):
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138 if self.__pos < len(self.__buf):
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139 raise Error('unextracted data remains')
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140
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141 def unpack_uint(self):
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142 i = self.__pos
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143 self.__pos = j = i+4
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144 data = self.__buf[i:j]
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145 if len(data) < 4:
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146 raise EOFError
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147 x = struct.unpack('>L', data)[0]
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148 try:
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149 return int(x)
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150 except OverflowError:
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151 return x
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152
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153 def unpack_int(self):
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154 i = self.__pos
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155 self.__pos = j = i+4
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156 data = self.__buf[i:j]
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157 if len(data) < 4:
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158 raise EOFError
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159 return struct.unpack('>l', data)[0]
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160
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161 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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162
77b57087fe45 Patch #1049151: adding bool support to xdrlib.py.
Martin v. Löwis <martin@v.loewis.de>
parents: 31515
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163 def unpack_bool(self):
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Martin v. Löwis <martin@v.loewis.de>
parents: 31515
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164 return bool(self.unpack_int())
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165
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166 def unpack_uhyper(self):
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167 hi = self.unpack_uint()
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168 lo = self.unpack_uint()
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169 return long(hi)<<32 | lo
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170
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171 def unpack_hyper(self):
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172 x = self.unpack_uhyper()
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173 if x >= 0x8000000000000000L:
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174 x = x - 0x10000000000000000L
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175 return x
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176
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177 def unpack_float(self):
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178 i = self.__pos
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179 self.__pos = j = i+4
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180 data = self.__buf[i:j]
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181 if len(data) < 4:
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182 raise EOFError
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183 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
184
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185 def unpack_double(self):
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186 i = self.__pos
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187 self.__pos = j = i+8
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188 data = self.__buf[i:j]
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189 if len(data) < 8:
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190 raise EOFError
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191 return struct.unpack('>d', data)[0]
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192
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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193 def unpack_fstring(self, n):
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194 if n < 0:
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195 raise ValueError, 'fstring size must be nonnegative'
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196 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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197 j = i + (n+3)//4*4
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198 if j > len(self.__buf):
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199 raise EOFError
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200 self.__pos = j
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201 return self.__buf[i:i+n]
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202
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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203 unpack_fopaque = unpack_fstring
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204
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205 def unpack_string(self):
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206 n = self.unpack_uint()
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diff changeset
207 return self.unpack_fstring(n)
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208
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
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diff changeset
209 unpack_opaque = unpack_string
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
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diff changeset
210 unpack_bytes = unpack_string
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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parents:
diff changeset
211
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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diff changeset
212 def unpack_list(self, unpack_item):
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213 list = []
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diff changeset
214 while 1:
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diff changeset
215 x = self.unpack_uint()
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diff changeset
216 if x == 0: break
15543
785155e2cfca Update the code to better reflect recommended style:
Fred Drake <fdrake@acm.org>
parents: 7755
diff changeset
217 if x != 1:
31515
71a294bd7950 Replace backticks with repr() or "%r"
Walter Dörwald <walter@livinglogic.de>
parents: 28089
diff changeset
218 raise ConversionError, '0 or 1 expected, got %r' % (x,)
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diff changeset
219 item = unpack_item()
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diff changeset
220 list.append(item)
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diff changeset
221 return list
4045
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parents:
diff changeset
222
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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parents:
diff changeset
223 def unpack_farray(self, n, unpack_item):
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diff changeset
224 list = []
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diff changeset
225 for i in range(n):
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diff changeset
226 list.append(unpack_item())
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diff changeset
227 return list
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parents:
diff changeset
228
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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parents:
diff changeset
229 def unpack_array(self, unpack_item):
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diff changeset
230 n = self.unpack_uint()
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parents: 5665
diff changeset
231 return self.unpack_farray(n, unpack_item)