Mercurial > cpython-lru_cache-weakref

annotate Lib/xdrlib.py @ 25838:8540887bcec6 2.2

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Backport of 2.183: Fix memory leak in add_subclass() found by NealN with valgrind.
author Guido van Rossum <guido@python.org>
date Fri, 18 Oct 2002 13:42:21 +0000
parents 6f62f5a62a2c
children e0ee009417df
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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:
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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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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 n = ((n+3)/4)*4
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83 data = s[:n]
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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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113
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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
Barry Warsaw <barry@python.org>
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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>
parents: 4450
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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
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160 unpack_bool = unpack_int
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161
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162 def unpack_uhyper(self):
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163 hi = self.unpack_uint()
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164 lo = self.unpack_uint()
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165 return long(hi)<<32 | lo
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166
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167 def unpack_hyper(self):
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168 x = self.unpack_uhyper()
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169 if x >= 0x8000000000000000L:
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170 x = x - 0x10000000000000000L
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171 return x
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172
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173 def unpack_float(self):
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174 i = self.__pos
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175 self.__pos = j = i+4
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176 data = self.__buf[i:j]
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177 if len(data) < 4:
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178 raise EOFError
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179 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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180
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181 def unpack_double(self):
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182 i = self.__pos
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183 self.__pos = j = i+8
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184 data = self.__buf[i:j]
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185 if len(data) < 8:
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186 raise EOFError
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187 return struct.unpack('>d', data)[0]
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188
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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189 def unpack_fstring(self, n):
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190 if n < 0:
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191 raise ValueError, 'fstring size must be nonnegative'
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192 i = self.__pos
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193 j = i + (n+3)/4*4
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194 if j > len(self.__buf):
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195 raise EOFError
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196 self.__pos = j
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197 return self.__buf[i:i+n]
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198
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199 unpack_fopaque = unpack_fstring
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200
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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201 def unpack_string(self):
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202 n = self.unpack_uint()
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203 return self.unpack_fstring(n)
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204
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
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205 unpack_opaque = unpack_string
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Guido van Rossum <guido@python.org>
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206 unpack_bytes = unpack_string
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parents:
diff changeset
207
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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208 def unpack_list(self, unpack_item):
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209 list = []
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210 while 1:
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211 x = self.unpack_uint()
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diff changeset
212 if x == 0: break
15543
785155e2cfca Update the code to better reflect recommended style:
Fred Drake <fdrake@acm.org>
parents: 7755
diff changeset
213 if x != 1:
7755
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diff changeset
214 raise ConversionError, '0 or 1 expected, got ' + `x`
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diff changeset
215 item = unpack_item()
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216 list.append(item)
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diff changeset
217 return list
4045
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parents:
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218
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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diff changeset
219 def unpack_farray(self, n, unpack_item):
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220 list = []
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diff changeset
221 for i in range(n):
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diff changeset
222 list.append(unpack_item())
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diff changeset
223 return list
4045
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parents:
diff changeset
224
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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parents:
diff changeset
225 def unpack_array(self, unpack_item):
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diff changeset
226 n = self.unpack_uint()
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diff changeset
227 return self.unpack_farray(n, unpack_item)
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parents:
diff changeset
228
15874
4c01ee0a8073 Whitespace normalization. Top level of Lib now fixed-point for reindent.py!
Tim Peters <tim.peters@gmail.com>
parents: 15543
diff changeset
229
4045
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Guido van Rossum <guido@python.org>
parents:
diff changeset
230 # test suite
4046
eb9fc404c066 Rename __test() to _test().
Guido van Rossum <guido@python.org>
parents: 4045
diff changeset
231 def _test():
4045
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
232 p = Packer()
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
233 packtest = [
7755
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diff changeset
234 (p.pack_uint, (9,)),
fb4b4d069cc7 Mass check-in after untabifying all files that need it.
Guido van Rossum <guido@python.org>
parents: 5665
diff changeset
235 (p.pack_bool, (None,)),
fb4b4d069cc7 Mass check-in after untabifying all files that need it.
Guido van Rossum <guido@python.org>
parents: 5665
diff changeset
236 (p.pack_bool, ('hello',)),
fb4b4d069cc7 Mass check-in after untabifying all files that need it.
Guido van Rossum <guido@python.org>
parents: 5665
diff changeset
237 (p.pack_uhyper, (45L,)),
fb4b4d069cc7 Mass check-in after untabifying all files that need it.
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parents: 5665
diff changeset
238 (p.pack_float, (1.9,)),
fb4b4d069cc7 Mass check-in after untabifying all files that need it.
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parents: 5665
diff changeset
239 (p.pack_double, (1.9,)),
fb4b4d069cc7 Mass check-in after untabifying all files that need it.
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diff changeset
240 (p.pack_string, ('hello world',)),
fb4b4d069cc7 Mass check-in after untabifying all files that need it.
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parents: 5665
diff changeset
241 (p.pack_list, (range(5), p.pack_uint)),
fb4b4d069cc7 Mass check-in after untabifying all files that need it.
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parents: 5665
diff changeset
242 (p.pack_array, (['what', 'is', 'hapnin', 'doctor'], p.pack_string)),
fb4b4d069cc7 Mass check-in after untabifying all files that need it.
Guido van Rossum <guido@python.org>
parents: 5665
diff changeset
243 ]
4045
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Guido van Rossum <guido@python.org>
parents:
diff changeset
244 succeedlist = [1] * len(packtest)
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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parents:
diff changeset
245 count = 0
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
246 for method, args in packtest:
7755
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diff changeset
247 print 'pack test', count,
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Guido van Rossum <guido@python.org>
parents: 5665
diff changeset
248 try:
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Guido van Rossum <guido@python.org>
parents: 5665
diff changeset
249 apply(method, args)
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Guido van Rossum <guido@python.org>
parents: 5665
diff changeset
250 print 'succeeded'
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Guido van Rossum <guido@python.org>
parents: 5665
diff changeset
251 except ConversionError, var:
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Guido van Rossum <guido@python.org>
parents: 5665
diff changeset
252 print 'ConversionError:', var.msg
fb4b4d069cc7 Mass check-in after untabifying all files that need it.
Guido van Rossum <guido@python.org>
parents: 5665
diff changeset
253 succeedlist[count] = 0
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Guido van Rossum <guido@python.org>
parents: 5665
diff changeset
254 count = count + 1
4045
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Guido van Rossum <guido@python.org>
parents:
diff changeset
255 data = p.get_buffer()
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
256 # now verify
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
257 up = Unpacker(data)
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
258 unpacktest = [
7755
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parents: 5665
diff changeset
259 (up.unpack_uint, (), lambda x: x == 9),
fb4b4d069cc7 Mass check-in after untabifying all files that need it.
Guido van Rossum <guido@python.org>
parents: 5665
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260 (up.unpack_bool, (), lambda x: not x),
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261 (up.unpack_bool, (), lambda x: x),
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262 (up.unpack_uhyper, (), lambda x: x == 45L),
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parents: 5665
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263 (up.unpack_float, (), lambda x: 1.89 < x < 1.91),
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parents: 5665
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264 (up.unpack_double, (), lambda x: 1.89 < x < 1.91),
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parents: 5665
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265 (up.unpack_string, (), lambda x: x == 'hello world'),
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parents: 5665
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266 (up.unpack_list, (up.unpack_uint,), lambda x: x == range(5)),
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Guido van Rossum <guido@python.org>
parents: 5665
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267 (up.unpack_array, (up.unpack_string,),
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Guido van Rossum <guido@python.org>
parents: 5665
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268 lambda x: x == ['what', 'is', 'hapnin', 'doctor']),
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Guido van Rossum <guido@python.org>
parents: 5665
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269 ]
4045
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
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270 count = 0
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
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271 for method, args, pred in unpacktest:
7755
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Guido van Rossum <guido@python.org>
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272 print 'unpack test', count,
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Guido van Rossum <guido@python.org>
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273 try:
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Guido van Rossum <guido@python.org>
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274 if succeedlist[count]:
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275 x = apply(method, args)
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276 print pred(x) and 'succeeded' or 'failed', ':', x
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parents: 5665
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277 else:
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Guido van Rossum <guido@python.org>
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278 print 'skipping'
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Guido van Rossum <guido@python.org>
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279 except ConversionError, var:
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280 print 'ConversionError:', var.msg
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Guido van Rossum <guido@python.org>
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281 count = count + 1
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96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
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282
15874
4c01ee0a8073 Whitespace normalization. Top level of Lib now fixed-point for reindent.py!
Tim Peters <tim.peters@gmail.com>
parents: 15543
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283
4045
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
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284 if __name__ == '__main__':
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eb9fc404c066 Rename __test() to _test().
Guido van Rossum <guido@python.org>
parents: 4045
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285 _test()