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# Base classes for ASN.1 types import sys from pyasn1.type import constraint, tagmap from pyasn1 import error class Asn1Item: pass class Asn1ItemBase(Asn1Item): # Set of tags for this ASN.1 type 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): return self is other or \ self._tagSet == other.getTagSet() and \ self._subtypeSpec == other.getSubtypeSpec() def isSuperTypeOf(self, other): """Returns true if argument is a ASN1 subtype of ourselves""" return self._tagSet.isSuperTagSetOf(other.getTagSet()) and \ 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') 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): if self._value is noValue: return self.__class__.__name__ + '()' else: return self.__class__.__name__ + '(%s)' % (self.prettyOut(self._value),) 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 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._value is noValue: return '<no value>' else: return self.prettyOut(self._value) # XXX Compatibility stub def prettyPrinter(self, scope=0): return self.prettyPrint(scope) # # 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 = self.__class__.__name__ + '()' for idx in range(len(self._componentValues)): if self._componentValues[idx] is None: continue r = r + '.setComponentByPosition(%s, %r)' % ( idx, self._componentValues[idx] ) 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 getComponentType(self): return self._componentType 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 def setDefaultComponents(self): pass