Mercurial > cpython-lru_cache-weakref

annotate Lib/xdrlib.py @ 78069:a8aa77458e12 3.2

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Add c_size_t and c_ssize_t to the ctypes summary table.
author Antoine Pitrou <solipsis@pitrou.net>
date Thu, 12 Jul 2012 20:31:50 +0200
parents bd5e821f201c
children e95e647040de 67053b135ed9
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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 from io import BytesIO
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9
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10 __all__ = ["Error", "Packer", "Unpacker", "ConversionError"]
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11
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12 # exceptions
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13 class Error(Exception):
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14 """Exception class for this module. Use:
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15
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16 except xdrlib.Error, var:
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17 # var has the Error instance for the exception
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18
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19 Public ivars:
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20 msg -- contains the message
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21
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22 """
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23 def __init__(self, msg):
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24 self.msg = msg
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25 def __repr__(self):
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26 return repr(self.msg)
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27 def __str__(self):
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28 return str(self.msg)
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30
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31 class ConversionError(Error):
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32 pass
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35
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36 class Packer:
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37 """Pack various data representations into a buffer."""
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38
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39 def __init__(self):
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40 self.reset()
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41
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42 def reset(self):
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43 self.__buf = BytesIO()
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44
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45 def get_buffer(self):
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46 return self.__buf.getvalue()
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47 # backwards compatibility
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48 get_buf = get_buffer
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49
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50 def pack_uint(self, x):
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51 self.__buf.write(struct.pack('>L', x))
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52
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53 def pack_int(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_enum = pack_int
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57
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58 def pack_bool(self, x):
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59 if x: self.__buf.write(b'\0\0\0\1')
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60 else: self.__buf.write(b'\0\0\0\0')
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61
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62 def pack_uhyper(self, x):
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63 self.pack_uint(x>>32 & 0xffffffff)
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64 self.pack_uint(x & 0xffffffff)
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65
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66 pack_hyper = pack_uhyper
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67
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68 def pack_float(self, x):
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69 try: self.__buf.write(struct.pack('>f', x))
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70 except struct.error as msg:
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71 raise ConversionError(msg)
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72
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73 def pack_double(self, x):
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74 try: self.__buf.write(struct.pack('>d', x))
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75 except struct.error as msg:
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76 raise ConversionError(msg)
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77
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78 def pack_fstring(self, n, s):
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79 if n < 0:
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80 raise ValueError('fstring size must be nonnegative')
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81 data = s[:n]
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82 n = ((n+3)//4)*4
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83 data = data + (n - len(data)) * b'\0'
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84 self.__buf.write(data)
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85
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86 pack_fopaque = pack_fstring
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87
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88 def pack_string(self, s):
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89 n = len(s)
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90 self.pack_uint(n)
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91 self.pack_fstring(n, s)
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92
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93 pack_opaque = pack_string
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94 pack_bytes = pack_string
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95
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96 def pack_list(self, list, pack_item):
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97 for item in list:
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98 self.pack_uint(1)
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99 pack_item(item)
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100 self.pack_uint(0)
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101
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102 def pack_farray(self, n, list, pack_item):
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103 if len(list) != n:
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104 raise ValueError('wrong array size')
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105 for item in list:
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106 pack_item(item)
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107
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108 def pack_array(self, list, pack_item):
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109 n = len(list)
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110 self.pack_uint(n)
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111 self.pack_farray(n, list, pack_item)
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112
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113
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114
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115 class Unpacker:
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116 """Unpacks various data representations from the given buffer."""
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117
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118 def __init__(self, data):
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119 self.reset(data)
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120
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121 def reset(self, data):
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122 self.__buf = data
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123 self.__pos = 0
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124
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125 def get_position(self):
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126 return self.__pos
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127
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128 def set_position(self, position):
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129 self.__pos = position
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130
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131 def get_buffer(self):
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132 return self.__buf
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133
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134 def done(self):
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135 if self.__pos < len(self.__buf):
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136 raise Error('unextracted data remains')
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137
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138 def unpack_uint(self):
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139 i = self.__pos
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140 self.__pos = j = i+4
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141 data = self.__buf[i:j]
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142 if len(data) < 4:
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143 raise EOFError
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144 x = struct.unpack('>L', data)[0]
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145 try:
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146 return int(x)
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147 except OverflowError:
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148 return x
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149
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150 def unpack_int(self):
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151 i = self.__pos
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152 self.__pos = j = i+4
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153 data = self.__buf[i:j]
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154 if len(data) < 4:
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155 raise EOFError
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156 return struct.unpack('>l', data)[0]
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157
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158 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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159
77b57087fe45 Patch #1049151: adding bool support to xdrlib.py.
Martin v. Löwis <martin@v.loewis.de>
parents: 31515
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160 def unpack_bool(self):
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161 return bool(self.unpack_int())
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162
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163 def unpack_uhyper(self):
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164 hi = self.unpack_uint()
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165 lo = self.unpack_uint()
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Guido van Rossum <guido@python.org>
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166 return int(hi)<<32 | lo
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167
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168 def unpack_hyper(self):
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169 x = self.unpack_uhyper()
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170 if x >= 0x8000000000000000:
1c26505c1de6 Rip out 'long' and 'L'-suffixed integer literals.
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171 x = x - 0x10000000000000000
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172 return x
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173
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174 def unpack_float(self):
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175 i = self.__pos
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176 self.__pos = j = i+4
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177 data = self.__buf[i:j]
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178 if len(data) < 4:
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179 raise EOFError
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180 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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181
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182 def unpack_double(self):
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183 i = self.__pos
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184 self.__pos = j = i+8
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185 data = self.__buf[i:j]
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186 if len(data) < 8:
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187 raise EOFError
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188 return struct.unpack('>d', data)[0]
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189
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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190 def unpack_fstring(self, n):
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191 if n < 0:
43020
907a45df1295 Raise statement normalization in Lib/.
Collin Winter <collinw@gmail.com>
parents: 42367
diff changeset
192 raise ValueError('fstring size must be nonnegative')
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193 i = self.__pos
37870
c4341e6c6a03 Fix typical truedivision problem (using the result of division as an index.)
Thomas Wouters <thomas@python.org>
parents: 35656
diff changeset
194 j = i + (n+3)//4*4
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195 if j > len(self.__buf):
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196 raise EOFError
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197 self.__pos = j
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198 return self.__buf[i:i+n]
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199
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200 unpack_fopaque = unpack_fstring
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201
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202 def unpack_string(self):
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203 n = self.unpack_uint()
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204 return self.unpack_fstring(n)
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205
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
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206 unpack_opaque = unpack_string
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Guido van Rossum <guido@python.org>
parents:
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207 unpack_bytes = unpack_string
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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parents:
diff changeset
208
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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diff changeset
209 def unpack_list(self, unpack_item):
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210 list = []
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211 while 1:
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212 x = self.unpack_uint()
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diff changeset
213 if x == 0: break
15543
785155e2cfca Update the code to better reflect recommended style:
Fred Drake <fdrake@acm.org>
parents: 7755
diff changeset
214 if x != 1:
43020
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Collin Winter <collinw@gmail.com>
parents: 42367
diff changeset
215 raise ConversionError('0 or 1 expected, got %r' % (x,))
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216 item = unpack_item()
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diff changeset
217 list.append(item)
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diff changeset
218 return list
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219
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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diff changeset
220 def unpack_farray(self, n, unpack_item):
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diff changeset
221 list = []
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diff changeset
222 for i in range(n):
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diff changeset
223 list.append(unpack_item())
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diff changeset
224 return list
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parents:
diff changeset
225
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
226 def unpack_array(self, unpack_item):
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227 n = self.unpack_uint()
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parents: 5665
diff changeset
228 return self.unpack_farray(n, unpack_item)