Mercurial > cpython-lru_cache-weakref

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

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents b5bbe5220f6b
children fb4b4d069cc7
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
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9 # exceptions
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10 class Error:
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11 """Exception class for this module. Use:
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12
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13 except xdrlib.Error, var:
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14 # var has the Error instance for the exception
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15
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16 Public ivars:
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17 msg -- contains the message
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18
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19 """
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20 def __init__(self, msg):
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21 self.msg = msg
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22 def __repr__(self):
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23 return repr(self.msg)
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24 def __str__(self):
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25 return str(self.msg)
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26
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27
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28 class ConversionError(Error):
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29 pass
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32
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33 class Packer:
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34 """Pack various data representations into a buffer."""
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35
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36 def __init__(self):
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37 self.reset()
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38
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39 def reset(self):
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40 self.__buf = ''
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41
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42 def get_buffer(self):
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43 return self.__buf
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44 # backwards compatibility
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45 get_buf = get_buffer
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46
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47 def pack_uint(self, x):
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48 self.__buf = self.__buf + struct.pack('>L', x)
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49
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50 pack_int = pack_uint
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51 pack_enum = pack_int
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52
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53 def pack_bool(self, x):
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54 if x: self.__buf = self.__buf + '\0\0\0\1'
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55 else: self.__buf = self.__buf + '\0\0\0\0'
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56
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57 def pack_uhyper(self, x):
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58 self.pack_uint(x>>32 & 0xffffffffL)
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59 self.pack_uint(x & 0xffffffffL)
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60
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61 pack_hyper = pack_uhyper
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62
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63 def pack_float(self, x):
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64 try: self.__buf = self.__buf + struct.pack('>f', x)
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65 except struct.error, msg:
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66 raise ConversionError, msg
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67
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68 def pack_double(self, x):
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69 try: self.__buf = self.__buf + struct.pack('>d', x)
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70 except struct.error, msg:
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71 raise ConversionError, msg
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72
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73 def pack_fstring(self, n, s):
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74 if n < 0:
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75 raise ValueError, 'fstring size must be nonnegative'
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76 n = ((n+3)/4)*4
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77 data = s[:n]
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78 data = data + (n - len(data)) * '\0'
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79 self.__buf = self.__buf + data
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80
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81 pack_fopaque = pack_fstring
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82
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83 def pack_string(self, s):
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84 n = len(s)
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85 self.pack_uint(n)
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86 self.pack_fstring(n, s)
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87
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88 pack_opaque = pack_string
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89 pack_bytes = pack_string
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90
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91 def pack_list(self, list, pack_item):
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92 for item in list:
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93 self.pack_uint(1)
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94 pack_item(item)
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95 self.pack_uint(0)
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96
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97 def pack_farray(self, n, list, pack_item):
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98 if len(list) <> n:
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99 raise ValueError, 'wrong array size'
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100 for item in list:
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101 pack_item(item)
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102
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103 def pack_array(self, list, pack_item):
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104 n = len(list)
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105 self.pack_uint(n)
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106 self.pack_farray(n, list, pack_item)
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107
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108
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109
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110 class Unpacker:
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111 """Unpacks various data representations from the given buffer."""
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112
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113 def __init__(self, data):
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114 self.reset(data)
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115
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116 def reset(self, data):
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117 self.__buf = data
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118 self.__pos = 0
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119
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120 def get_position(self):
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121 return self.__pos
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122
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123 def set_position(self, position):
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124 self.__pos = position
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125
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126 def get_buffer(self):
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127 return self.__buf
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128
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129 def done(self):
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130 if self.__pos < len(self.__buf):
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131 raise Error('unextracted data remains')
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132
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133 def unpack_uint(self):
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134 i = self.__pos
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135 self.__pos = j = i+4
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136 data = self.__buf[i:j]
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137 if len(data) < 4:
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138 raise EOFError
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139 x = struct.unpack('>L', data)[0]
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140 try:
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141 return int(x)
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142 except OverflowError:
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143 return x
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144
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145 def unpack_int(self):
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146 i = self.__pos
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147 self.__pos = j = i+4
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148 data = self.__buf[i:j]
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149 if len(data) < 4:
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150 raise EOFError
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151 return struct.unpack('>l', data)[0]
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152
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153 unpack_enum = unpack_int
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154 unpack_bool = unpack_int
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155
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156 def unpack_uhyper(self):
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157 hi = self.unpack_uint()
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158 lo = self.unpack_uint()
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159 return long(hi)<<32 | lo
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160
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161 def unpack_hyper(self):
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162 x = self.unpack_uhyper()
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163 if x >= 0x8000000000000000L:
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164 x = x - 0x10000000000000000L
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165 return x
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166
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167 def unpack_float(self):
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168 i = self.__pos
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169 self.__pos = j = i+4
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170 data = self.__buf[i:j]
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171 if len(data) < 4:
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172 raise EOFError
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173 return struct.unpack('>f', data)[0]
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174
4045
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175 def unpack_double(self):
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176 i = self.__pos
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177 self.__pos = j = i+8
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178 data = self.__buf[i:j]
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179 if len(data) < 8:
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180 raise EOFError
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181 return struct.unpack('>d', data)[0]
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182
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183 def unpack_fstring(self, n):
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184 if n < 0:
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185 raise ValueError, 'fstring size must be nonnegative'
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186 i = self.__pos
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187 j = i + (n+3)/4*4
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188 if j > len(self.__buf):
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189 raise EOFError
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190 self.__pos = j
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191 return self.__buf[i:i+n]
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192
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193 unpack_fopaque = unpack_fstring
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194
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195 def unpack_string(self):
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196 n = self.unpack_uint()
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197 return self.unpack_fstring(n)
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198
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199 unpack_opaque = unpack_string
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200 unpack_bytes = unpack_string
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201
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202 def unpack_list(self, unpack_item):
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203 list = []
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204 while 1:
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205 x = self.unpack_uint()
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206 if x == 0: break
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207 if x <> 1:
4953
da4a497bea3a Raise ConversionError instances the new fangled way, e.g.:
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208 raise ConversionError, '0 or 1 expected, got ' + `x`
4045
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209 item = unpack_item()
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210 list.append(item)
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211 return list
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212
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213 def unpack_farray(self, n, unpack_item):
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214 list = []
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215 for i in range(n):
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216 list.append(unpack_item())
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217 return list
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parents:
diff changeset
218
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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219 def unpack_array(self, unpack_item):
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220 n = self.unpack_uint()
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diff changeset
221 return self.unpack_farray(n, unpack_item)
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parents:
diff changeset
222
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
223
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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diff changeset
224 # test suite
4046
eb9fc404c066 Rename __test() to _test().
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225 def _test():
4045
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226 p = Packer()
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diff changeset
227 packtest = [
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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diff changeset
228 (p.pack_uint, (9,)),
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parents:
diff changeset
229 (p.pack_bool, (None,)),
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parents:
diff changeset
230 (p.pack_bool, ('hello',)),
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parents:
diff changeset
231 (p.pack_uhyper, (45L,)),
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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parents:
diff changeset
232 (p.pack_float, (1.9,)),
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parents:
diff changeset
233 (p.pack_double, (1.9,)),
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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parents:
diff changeset
234 (p.pack_string, ('hello world',)),
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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parents:
diff changeset
235 (p.pack_list, (range(5), p.pack_uint)),
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parents:
diff changeset
236 (p.pack_array, (['what', 'is', 'hapnin', 'doctor'], p.pack_string)),
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
237 ]
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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diff changeset
238 succeedlist = [1] * len(packtest)
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parents:
diff changeset
239 count = 0
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Guido van Rossum <guido@python.org>
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diff changeset
240 for method, args in packtest:
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parents:
diff changeset
241 print 'pack test', count,
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
242 try:
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
243 apply(method, args)
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Guido van Rossum <guido@python.org>
parents:
diff changeset
244 print 'succeeded'
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
245 except ConversionError, var:
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
246 print 'ConversionError:', var.msg
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Guido van Rossum <guido@python.org>
parents:
diff changeset
247 succeedlist[count] = 0
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Guido van Rossum <guido@python.org>
parents:
diff changeset
248 count = count + 1
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Guido van Rossum <guido@python.org>
parents:
diff changeset
249 data = p.get_buffer()
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Guido van Rossum <guido@python.org>
parents:
diff changeset
250 # now verify
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Guido van Rossum <guido@python.org>
parents:
diff changeset
251 up = Unpacker(data)
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Guido van Rossum <guido@python.org>
parents:
diff changeset
252 unpacktest = [
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
253 (up.unpack_uint, (), lambda x: x == 9),
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
254 (up.unpack_bool, (), lambda x: not x),
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
255 (up.unpack_bool, (), lambda x: x),
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
256 (up.unpack_uhyper, (), lambda x: x == 45L),
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Guido van Rossum <guido@python.org>
parents:
diff changeset
257 (up.unpack_float, (), lambda x: 1.89 < x < 1.91),
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
258 (up.unpack_double, (), lambda x: 1.89 < x < 1.91),
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
259 (up.unpack_string, (), lambda x: x == 'hello world'),
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
260 (up.unpack_list, (up.unpack_uint,), lambda x: x == range(5)),
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
261 (up.unpack_array, (up.unpack_string,),
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
262 lambda x: x == ['what', 'is', 'hapnin', 'doctor']),
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
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263 ]
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
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264 count = 0
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Guido van Rossum <guido@python.org>
parents:
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265 for method, args, pred in unpacktest:
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
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266 print 'unpack test', count,
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
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267 try:
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
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268 if succeedlist[count]:
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parents:
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269 x = apply(method, args)
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parents:
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270 print pred(x) and 'succeeded' or 'failed', ':', x
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Guido van Rossum <guido@python.org>
parents:
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271 else:
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Guido van Rossum <guido@python.org>
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272 print 'skipping'
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Guido van Rossum <guido@python.org>
parents:
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273 except ConversionError, var:
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Guido van Rossum <guido@python.org>
parents:
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274 print 'ConversionError:', var.msg
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Guido van Rossum <guido@python.org>
parents:
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275 count = count + 1
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Guido van Rossum <guido@python.org>
parents:
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276
4953
da4a497bea3a Raise ConversionError instances the new fangled way, e.g.:
Barry Warsaw <barry@python.org>
parents: 4860
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277
4045
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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parents:
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278 if __name__ == '__main__':
4046
eb9fc404c066 Rename __test() to _test().
Guido van Rossum <guido@python.org>
parents: 4045
diff changeset
279 _test()