1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
|
#
# This file is part of pyasn1 software.
#
# Copyright (c) 2005-2015, Ilya Etingof <ilya@glas.net>
# License: http://pyasn1.sf.net/license.html
#
import sys
from pyasn1.type import constraint, tagmap, tag
from pyasn1 import error
class Asn1Item: pass
class Asn1ItemBase(Asn1Item):
# Set of tags for this ASN.1 type
tagSet = tag.TagSet()
# A list of constraint.Constraint instances for checking values
subtypeSpec = constraint.ConstraintsIntersection()
# Used for ambiguous ASN.1 types identification
typeId = None
def __init__(self, tagSet=None, subtypeSpec=None):
if tagSet is None:
self._tagSet = self.tagSet
else:
self._tagSet = tagSet
if subtypeSpec is None:
self._subtypeSpec = self.subtypeSpec
else:
self._subtypeSpec = subtypeSpec
def _verifySubtypeSpec(self, value, idx=None):
try:
self._subtypeSpec(value, idx)
except error.PyAsn1Error:
c, i, t = sys.exc_info()
raise c('%s at %s' % (i, self.__class__.__name__))
def getSubtypeSpec(self): return self._subtypeSpec
def getTagSet(self): return self._tagSet
def getEffectiveTagSet(self): return self._tagSet # used by untagged types
def getTagMap(self): return tagmap.TagMap({self._tagSet: self})
def isSameTypeWith(self, other, matchTags=True, matchConstraints=True):
return self is other or \
(not matchTags or \
self._tagSet == other.getTagSet()) and \
(not matchConstraints or \
self._subtypeSpec==other.getSubtypeSpec())
def isSuperTypeOf(self, other, matchTags=True, matchConstraints=True):
"""Returns true if argument is a ASN1 subtype of ourselves"""
return (not matchTags or \
self._tagSet.isSuperTagSetOf(other.getTagSet())) and \
(not matchConstraints or \
(self._subtypeSpec.isSuperTypeOf(other.getSubtypeSpec())))
class NoValue:
def __getattr__(self, attr):
raise error.PyAsn1Error('No value for %s()' % attr)
def __getitem__(self, i):
raise error.PyAsn1Error('No value')
def __repr__(self): return '%s()' % self.__class__.__name__
noValue = NoValue()
# Base class for "simple" ASN.1 objects. These are immutable.
class AbstractSimpleAsn1Item(Asn1ItemBase):
defaultValue = noValue
def __init__(self, value=None, tagSet=None, subtypeSpec=None):
Asn1ItemBase.__init__(self, tagSet, subtypeSpec)
if value is None or value is noValue:
value = self.defaultValue
if value is None or value is noValue:
self.__hashedValue = value = noValue
else:
value = self.prettyIn(value)
self._verifySubtypeSpec(value)
self.__hashedValue = hash(value)
self._value = value
self._len = None
def __repr__(self):
r = []
if self._value is not self.defaultValue:
r.append(self.prettyOut(self._value))
if self._tagSet is not self.tagSet:
r.append('tagSet=%r' % (self._tagSet,))
if self._subtypeSpec is not self.subtypeSpec:
r.append('subtypeSpec=%r' % (self._subtypeSpec,))
return '%s(%s)' % (self.__class__.__name__, ', '.join(r))
def __str__(self): return str(self._value)
def __eq__(self, other):
return self is other and True or self._value == other
def __ne__(self, other): return self._value != other
def __lt__(self, other): return self._value < other
def __le__(self, other): return self._value <= other
def __gt__(self, other): return self._value > other
def __ge__(self, other): return self._value >= other
if sys.version_info[0] <= 2:
def __nonzero__(self): return bool(self._value)
else:
def __bool__(self): return bool(self._value)
def __hash__(self):
return self.__hashedValue is noValue and hash(noValue) or self.__hashedValue
def hasValue(self):
return not isinstance(self._value, NoValue)
def clone(self, value=None, tagSet=None, subtypeSpec=None):
if value is None and tagSet is None and subtypeSpec is None:
return self
if value is None:
value = self._value
if tagSet is None:
tagSet = self._tagSet
if subtypeSpec is None:
subtypeSpec = self._subtypeSpec
return self.__class__(value, tagSet, subtypeSpec)
def subtype(self, value=None, implicitTag=None, explicitTag=None,
subtypeSpec=None):
if value is None:
value = self._value
if implicitTag is not None:
tagSet = self._tagSet.tagImplicitly(implicitTag)
elif explicitTag is not None:
tagSet = self._tagSet.tagExplicitly(explicitTag)
else:
tagSet = self._tagSet
if subtypeSpec is None:
subtypeSpec = self._subtypeSpec
else:
subtypeSpec = subtypeSpec + self._subtypeSpec
return self.__class__(value, tagSet, subtypeSpec)
def prettyIn(self, value): return value
def prettyOut(self, value): return str(value)
def prettyPrint(self, scope=0):
if self.hasValue():
return self.prettyOut(self._value)
else:
return '<no value>'
# XXX Compatibility stub
def prettyPrinter(self, scope=0): return self.prettyPrint(scope)
def prettyPrintType(self, scope=0):
return '%s -> %s' % (self.getTagSet(), self.__class__.__name__)
#
# Constructed types:
# * There are five of them: Sequence, SequenceOf/SetOf, Set and Choice
# * ASN1 types and values are represened by Python class instances
# * Value initialization is made for defaulted components only
# * Primary method of component addressing is by-position. Data model for base
# type is Python sequence. Additional type-specific addressing methods
# may be implemented for particular types.
# * SequenceOf and SetOf types do not implement any additional methods
# * Sequence, Set and Choice types also implement by-identifier addressing
# * Sequence, Set and Choice types also implement by-asn1-type (tag) addressing
# * Sequence and Set types may include optional and defaulted
# components
# * Constructed types hold a reference to component types used for value
# verification and ordering.
# * Component type is a scalar type for SequenceOf/SetOf types and a list
# of types for Sequence/Set/Choice.
#
class AbstractConstructedAsn1Item(Asn1ItemBase):
componentType = None
sizeSpec = constraint.ConstraintsIntersection()
def __init__(self, componentType=None, tagSet=None,
subtypeSpec=None, sizeSpec=None):
Asn1ItemBase.__init__(self, tagSet, subtypeSpec)
if componentType is None:
self._componentType = self.componentType
else:
self._componentType = componentType
if sizeSpec is None:
self._sizeSpec = self.sizeSpec
else:
self._sizeSpec = sizeSpec
self._componentValues = []
self._componentValuesSet = 0
def __repr__(self):
r = []
if self._componentType is not self.componentType:
r.append('componentType=%r' % (self._componentType,))
if self._tagSet is not self.tagSet:
r.append('tagSet=%r' % (self._tagSet,))
if self._subtypeSpec is not self.subtypeSpec:
r.append('subtypeSpec=%r' % (self._subtypeSpec,))
r = '%s(%s)' % (self.__class__.__name__, ', '.join(r))
if self._componentValues:
r += '.setComponents(%s)' % ', '.join([repr(x) for x in self._componentValues])
return r
def __eq__(self, other):
return self is other and True or self._componentValues == other
def __ne__(self, other): return self._componentValues != other
def __lt__(self, other): return self._componentValues < other
def __le__(self, other): return self._componentValues <= other
def __gt__(self, other): return self._componentValues > other
def __ge__(self, other): return self._componentValues >= other
if sys.version_info[0] <= 2:
def __nonzero__(self): return bool(self._componentValues)
else:
def __bool__(self): return bool(self._componentValues)
def getComponentTagMap(self):
raise error.PyAsn1Error('Method not implemented')
def _cloneComponentValues(self, myClone, cloneValueFlag): pass
def clone(self, tagSet=None, subtypeSpec=None, sizeSpec=None,
cloneValueFlag=None):
if tagSet is None:
tagSet = self._tagSet
if subtypeSpec is None:
subtypeSpec = self._subtypeSpec
if sizeSpec is None:
sizeSpec = self._sizeSpec
r = self.__class__(self._componentType, tagSet, subtypeSpec, sizeSpec)
if cloneValueFlag:
self._cloneComponentValues(r, cloneValueFlag)
return r
def subtype(self, implicitTag=None, explicitTag=None, subtypeSpec=None,
sizeSpec=None, cloneValueFlag=None):
if implicitTag is not None:
tagSet = self._tagSet.tagImplicitly(implicitTag)
elif explicitTag is not None:
tagSet = self._tagSet.tagExplicitly(explicitTag)
else:
tagSet = self._tagSet
if subtypeSpec is None:
subtypeSpec = self._subtypeSpec
else:
subtypeSpec = subtypeSpec + self._subtypeSpec
if sizeSpec is None:
sizeSpec = self._sizeSpec
else:
sizeSpec = sizeSpec + self._sizeSpec
r = self.__class__(self._componentType, tagSet, subtypeSpec, sizeSpec)
if cloneValueFlag:
self._cloneComponentValues(r, cloneValueFlag)
return r
def _verifyComponent(self, idx, value): pass
def verifySizeSpec(self): self._sizeSpec(self)
def getComponentByPosition(self, idx):
raise error.PyAsn1Error('Method not implemented')
def setComponentByPosition(self, idx, value, verifyConstraints=True):
raise error.PyAsn1Error('Method not implemented')
def setComponents(self, *args, **kwargs):
for idx in range(len(args)):
self[idx] = args[idx]
for k in kwargs:
self[k] = kwargs[k]
return self
def getComponentType(self): return self._componentType
def setDefaultComponents(self): pass
def __getitem__(self, idx): return self.getComponentByPosition(idx)
def __setitem__(self, idx, value): self.setComponentByPosition(idx, value)
def __len__(self): return len(self._componentValues)
def clear(self):
self._componentValues = []
self._componentValuesSet = 0
|