Mercurial > cpython-lru_cache-weakref

annotate Lib/xdrlib.py @ 4566:6403c94de50d legacy-trunk

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Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents 91c696457fd4
children 6f1a120ae9c0
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 This module will conditionally use the _xdrmodule.so module to get
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6 support for those representations we can't do much with from Python.
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7
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8 """
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9
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10 import struct
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11 from types import LongType
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12
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13 # use C layer XDR libraries for some data types if available
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14 try:
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15 import _xdr
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16 except ImportError:
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17 _xdr = None
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18
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19 # this test is done to see if machine representation is the same as
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20 # network representation. if so, we can use module struct for packing
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21 # some data types
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22 _USE_MACHINE_REP = (struct.pack('l', 1) == '\0\0\0\1')
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23
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24 # exceptions
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25 class Error:
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26 """Exception class for this module. Use:
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27
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28 except xdrlib.Error, var:
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29 # var has the Error instance for the exception
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30
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31 Public ivars:
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32 msg -- contains the message
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33
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34 """
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35 def __init__(self, msg):
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36 self.msg = msg
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37 def __repr__(self):
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38 return repr(self.msg)
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39 def __str__(self):
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40 return str(self.msg)
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41
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42
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43 class ConversionError(Error):
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44 pass
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47
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48 class Packer:
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49 """Pack various data representations into a buffer."""
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50
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51 def __init__(self):
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52 self.reset()
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53
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54 def reset(self):
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55 self.__buf = ''
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56
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57 def get_buffer(self):
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58 return self.__buf
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59 # backwards compatibility
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60 get_buf = get_buffer
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61
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62 def pack_uint(self, x):
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63 self.__buf = self.__buf + \
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64 (chr(int(x>>24 & 0xff)) + chr(int(x>>16 & 0xff)) + \
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65 chr(int(x>>8 & 0xff)) + chr(int(x & 0xff)))
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66 if _USE_MACHINE_REP:
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67 def pack_uint(self, x):
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68 if type(x) == LongType:
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69 x = int((x + 0x80000000L) % 0x100000000L - 0x80000000L)
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70 self.__buf = self.__buf + struct.pack('l', x)
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71
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72 pack_int = pack_uint
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73 pack_enum = pack_int
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74
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75 def pack_bool(self, x):
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76 if x: self.__buf = self.__buf + '\0\0\0\1'
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77 else: self.__buf = self.__buf + '\0\0\0\0'
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78
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79 def pack_uhyper(self, x):
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80 self.pack_uint(int(x>>32 & 0xffffffff))
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81 self.pack_uint(int(x & 0xffffffff))
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82
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83 pack_hyper = pack_uhyper
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84
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85 def pack_float(self, x):
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86 raise ConversionError('Not supported')
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87 def pack_double(self, x):
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88 raise ConversionError('Not supported')
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89 # get these from the C layer if available
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90 if _xdr:
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91 def pack_float(self, x):
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92 try: self.__buf = self.__buf + _xdr.pack_float(x)
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93 except _xdr.error, msg:
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94 raise ConversionError(msg)
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95 def pack_double(self, x):
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96 try: self.__buf = self.__buf + _xdr.pack_double(x)
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97 except _xdr.error, msg:
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98 raise ConversionError(msg)
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99
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100 def pack_fstring(self, n, s):
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101 if n < 0:
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102 raise ValueError, 'fstring size must be nonnegative'
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103 n = ((n+3)/4)*4
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104 data = s[:n]
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105 data = data + (n - len(data)) * '\0'
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106 self.__buf = self.__buf + data
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107
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108 pack_fopaque = pack_fstring
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109
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110 def pack_string(self, s):
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111 n = len(s)
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112 self.pack_uint(n)
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113 self.pack_fstring(n, s)
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114
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115 pack_opaque = pack_string
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116 pack_bytes = pack_string
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117
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118 def pack_list(self, list, pack_item):
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119 for item in list:
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120 self.pack_uint(1)
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121 pack_item(item)
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122 self.pack_uint(0)
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123
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124 def pack_farray(self, n, list, pack_item):
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125 if len(list) <> n:
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126 raise ValueError, 'wrong array size'
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127 for item in list:
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128 pack_item(item)
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129
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130 def pack_array(self, list, pack_item):
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diff changeset
131 n = len(list)
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parents:
diff changeset
132 self.pack_uint(n)
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parents:
diff changeset
133 self.pack_farray(n, list, pack_item)
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parents:
diff changeset
134
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diff changeset
135
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parents:
diff changeset
136
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parents:
diff changeset
137 class Unpacker:
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parents:
diff changeset
138 """Unpacks various data representations from the given buffer."""
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parents:
diff changeset
139
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diff changeset
140 def __init__(self, data):
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parents:
diff changeset
141 self.reset(data)
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diff changeset
142
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diff changeset
143 def reset(self, data):
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parents:
diff changeset
144 self.__buf = data
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diff changeset
145 self.__pos = 0
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diff changeset
146
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diff changeset
147 def get_position(self):
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parents:
diff changeset
148 return self.__pos
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diff changeset
149
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diff changeset
150 def set_position(self, position):
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parents:
diff changeset
151 self.__pos = position
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parents:
diff changeset
152
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diff changeset
153 def done(self):
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Guido van Rossum <guido@python.org>
parents:
diff changeset
154 if self.__pos < len(self.__buf):
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Guido van Rossum <guido@python.org>
parents:
diff changeset
155 raise Error('unextracted data remains')
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Guido van Rossum <guido@python.org>
parents:
diff changeset
156
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parents:
diff changeset
157 def unpack_uint(self):
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Guido van Rossum <guido@python.org>
parents:
diff changeset
158 i = self.__pos
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parents:
diff changeset
159 self.__pos = j = i+4
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Guido van Rossum <guido@python.org>
parents:
diff changeset
160 data = self.__buf[i:j]
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Guido van Rossum <guido@python.org>
parents:
diff changeset
161 if len(data) < 4:
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parents:
diff changeset
162 raise EOFError
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Guido van Rossum <guido@python.org>
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163 x = long(ord(data[0]))<<24 | ord(data[1])<<16 | \
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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parents:
diff changeset
164 ord(data[2])<<8 | ord(data[3])
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parents:
diff changeset
165 # Return a Python long only if the value is not representable
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parents:
diff changeset
166 # as a nonnegative Python int
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parents:
diff changeset
167 if x < 0x80000000L:
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parents:
diff changeset
168 x = int(x)
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Guido van Rossum <guido@python.org>
parents:
diff changeset
169 return x
4159
df63985c1ca9 No double underscores for globals please
Guido van Rossum <guido@python.org>
parents: 4046
diff changeset
170 if _USE_MACHINE_REP:
4045
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parents:
diff changeset
171 def unpack_uint(self):
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
172 i = self.__pos
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
173 self.__pos = j = i+4
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
174 data = self.__buf[i:j]
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
175 if len(data) < 4:
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
176 raise EOFError
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
177 return struct.unpack('l', data)[0]
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Guido van Rossum <guido@python.org>
parents:
diff changeset
178
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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179 def unpack_int(self):
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
180 x = self.unpack_uint()
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Guido van Rossum <guido@python.org>
parents:
diff changeset
181 if x >= 0x80000000L:
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
182 x = x - 0x100000000L
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
183 return int(x)
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
184
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
185 unpack_enum = unpack_int
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
186 unpack_bool = unpack_int
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
187
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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diff changeset
188 def unpack_uhyper(self):
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
189 hi = self.unpack_uint()
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
190 lo = self.unpack_uint()
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
191 return long(hi)<<32 | lo
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Guido van Rossum <guido@python.org>
parents:
diff changeset
192
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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parents:
diff changeset
193 def unpack_hyper(self):
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Guido van Rossum <guido@python.org>
parents:
diff changeset
194 x = self.unpack_uhyper()
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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parents:
diff changeset
195 if x >= 0x8000000000000000L:
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parents:
diff changeset
196 x = x - 0x10000000000000000L
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Guido van Rossum <guido@python.org>
parents:
diff changeset
197 return x
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parents:
diff changeset
198
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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diff changeset
199 def unpack_float(self):
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parents:
diff changeset
200 raise ConversionError('Not supported')
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Guido van Rossum <guido@python.org>
parents:
diff changeset
201 def unpack_double(self):
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parents:
diff changeset
202 raise ConversionError('Not supported')
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
203 # get these from the C layer if available
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
204 if _xdr:
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
205 def unpack_float(self):
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Guido van Rossum <guido@python.org>
parents:
diff changeset
206 i = self.__pos
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Guido van Rossum <guido@python.org>
parents:
diff changeset
207 self.__pos = j = i+4
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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parents:
diff changeset
208 data = self.__buf[i:j]
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
209 if len(data) < 4:
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
210 raise EOFError
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
211 try: return _xdr.unpack_float(data)
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
212 except _xdr.error, msg:
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
213 raise ConversionError(msg)
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
214
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
215 def unpack_double(self):
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
216 i = self.__pos
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Guido van Rossum <guido@python.org>
parents:
diff changeset
217 self.__pos = j = i+8
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
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parents:
diff changeset
218 data = self.__buf[i:j]
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
219 if len(data) < 8:
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
220 raise EOFError
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
221 try: return _xdr.unpack_double(data)
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
222 except _xdr.error, msg:
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
223 raise ConversionError(msg)
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
224
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
225 def unpack_fstring(self, n):
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
226 if n < 0:
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
227 raise ValueError, 'fstring size must be nonnegative'
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
228 i = self.__pos
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
229 j = i + (n+3)/4*4
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
230 if j > len(self.__buf):
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
231 raise EOFError
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
232 self.__pos = j
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
233 return self.__buf[i:i+n]
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
234
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
235 unpack_fopaque = unpack_fstring
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
236
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
237 def unpack_string(self):
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
238 n = self.unpack_uint()
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
239 return self.unpack_fstring(n)
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
240
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
241 unpack_opaque = unpack_string
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
242 unpack_bytes = unpack_string
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
243
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
244 def unpack_list(self, unpack_item):
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
245 list = []
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
246 while 1:
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
247 x = self.unpack_uint()
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
248 if x == 0: break
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
249 if x <> 1:
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
250 raise ConversionError('0 or 1 expected, got ' + `x`)
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
251 item = unpack_item()
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
252 list.append(item)
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
253 return list
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
254
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
255 def unpack_farray(self, n, unpack_item):
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
256 list = []
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
257 for i in range(n):
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
258 list.append(unpack_item())
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
259 return list
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
260
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
261 def unpack_array(self, unpack_item):
96e0a7204e31 XDR interface, evolved from Demo/rpc/xdr.py by Barry.
Guido van Rossum <guido@python.org>
parents:
diff changeset
262 n = self.unpack_uint()
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263 return self.unpack_farray(n, unpack_item)
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264
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265
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266 # test suite
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267 def _test():
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268 p = Packer()
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269 packtest = [
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270 (p.pack_uint, (9,)),
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271 (p.pack_bool, (None,)),
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272 (p.pack_bool, ('hello',)),
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273 (p.pack_uhyper, (45L,)),
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274 (p.pack_float, (1.9,)),
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275 (p.pack_double, (1.9,)),
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276 (p.pack_string, ('hello world',)),
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277 (p.pack_list, (range(5), p.pack_uint)),
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278 (p.pack_array, (['what', 'is', 'hapnin', 'doctor'], p.pack_string)),
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279 ]
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280 succeedlist = [1] * len(packtest)
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281 count = 0
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282 for method, args in packtest:
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283 print 'pack test', count,
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284 try:
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285 apply(method, args)
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286 print 'succeeded'
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287 except ConversionError, var:
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288 print 'ConversionError:', var.msg
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289 succeedlist[count] = 0
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290 count = count + 1
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291 data = p.get_buffer()
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292 # now verify
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293 up = Unpacker(data)
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294 unpacktest = [
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295 (up.unpack_uint, (), lambda x: x == 9),
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296 (up.unpack_bool, (), lambda x: not x),
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297 (up.unpack_bool, (), lambda x: x),
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298 (up.unpack_uhyper, (), lambda x: x == 45L),
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299 (up.unpack_float, (), lambda x: 1.89 < x < 1.91),
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300 (up.unpack_double, (), lambda x: 1.89 < x < 1.91),
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301 (up.unpack_string, (), lambda x: x == 'hello world'),
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302 (up.unpack_list, (up.unpack_uint,), lambda x: x == range(5)),
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303 (up.unpack_array, (up.unpack_string,),
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304 lambda x: x == ['what', 'is', 'hapnin', 'doctor']),
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305 ]
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306 count = 0
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307 for method, args, pred in unpacktest:
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308 print 'unpack test', count,
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309 try:
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310 if succeedlist[count]:
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311 x = apply(method, args)
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312 print pred(x) and 'succeeded' or 'failed', ':', x
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313 else:
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314 print 'skipping'
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315 except ConversionError, var:
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316 print 'ConversionError:', var.msg
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317 count = count + 1
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318
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319 if __name__ == '__main__':
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320 _test()