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""" return tagmap.TagMap({self.tagSet: self}) def isSameTypeWith(self, other, matchTags=True, matchConstraints=True): """Examine |ASN.1| type for equality with other ASN.1 type. ASN.1 tags (:py:mod:`~pyasn1.type.tag`) and constraints (:py:mod:`~pyasn1.type.constraint`) are examined when carrying out ASN.1 types comparison. Python class inheritance relationship is NOT considered. Parameters ---------- other: a pyasn1 type object Class instance representing ASN.1 type. Returns ------- : :class:`bool` :class:`True` if *other* is |ASN.1| type, :class:`False` otherwise. """ return (self is other or (not matchTags or self.tagSet == other.tagSet) and (not matchConstraints or self.subtypeSpec == other.subtypeSpec)) def isSuperTypeOf(self, other, matchTags=True, matchConstraints=True): """Examine |ASN.1| type for subtype relationship with other ASN.1 type. ASN.1 tags (:py:mod:`~pyasn1.type.tag`) and constraints (:py:mod:`~pyasn1.type.constraint`) are examined when carrying out ASN.1 types comparison. Python class inheritance relationship is NOT considered. Parameters ---------- other: a pyasn1 type object Class instance representing ASN.1 type. Returns ------- : :class:`bool` :class:`True` if *other* is a subtype of |ASN.1| type, :class:`False` otherwise. """ return (not matchTags or (self.tagSet.isSuperTagSetOf(other.tagSet)) and (not matchConstraints or self.subtypeSpec.isSuperTypeOf(other.subtypeSpec))) @staticmethod def isNoValue(*values): for value in values: if value is not noValue: return False return True def prettyPrint(self, scope=0): raise NotImplementedError() # backward compatibility def getTagSet(self): return self.tagSet def getEffectiveTagSet(self): return self.effectiveTagSet def getTagMap(self): return self.tagMap def getSubtypeSpec(self): return self.subtypeSpec def hasValue(self): return self.isValue class NoValue(object): """Create a singleton instance of NoValue class. The *NoValue* sentinel object represents an instance of ASN.1 schema object as opposed to ASN.1 value object. Only ASN.1 schema-related operations can be performed on ASN.1 schema objects. Warning ------- Any operation attempted on the *noValue* object will raise the *PyAsn1Error* exception. """ skipMethods = set( ('__slots__', # attributes '__getattribute__', '__getattr__', '__setattr__', '__delattr__', # class instance '__class__', '__init__', '__del__', '__new__', '__repr__', '__qualname__', '__objclass__', 'im_class', '__sizeof__', # pickle protocol '__reduce__', '__reduce_ex__', '__getnewargs__', '__getinitargs__', '__getstate__', '__setstate__') ) _instance = None def __new__(cls): if cls._instance is None: def getPlug(name): def plug(self, *args, **kw): raise error.PyAsn1Error('Attempted "%s" operation on ASN.1 schema object' % name) return plug op_names = [name for typ in (str, int, list, dict) for name in dir(typ) if (name not in cls.skipMethods and name.startswith('__') and name.endswith('__') and calling.callable(getattr(typ, name)))] for name in set(op_names): setattr(cls, name, getPlug(name)) cls._instance = object.__new__(cls) return cls._instance def __getattr__(self, attr): if attr in self.skipMethods: raise AttributeError('Attribute %s not present' % attr) raise error.PyAsn1Error('Attempted "%s" operation on ASN.1 schema object' % attr) def __repr__(self): return '<%s object at %s>' % (self.__class__.__name__, id(self)) noValue = NoValue() # Base class for "simple" ASN.1 objects. These are immutable. class AbstractSimpleAsn1Item(Asn1ItemBase): #: Default payload value defaultValue = noValue def __init__(self, value=noValue, **kwargs): Asn1ItemBase.__init__(self, **kwargs) if value is noValue: value = self.defaultValue else: value = self.prettyIn(value) try: self.subtypeSpec(value) except error.PyAsn1Error: exType, exValue, exTb = sys.exc_info() raise exType('%s at %s' % (exValue, self.__class__.__name__)) self._value = value def __repr__(self): representation = '%s %s object at 0x%x' % ( self.__class__.__name__, self.isValue and 'value' or 'schema', id(self) ) for attr, value in self.readOnly.items(): if value: representation += ' %s %s' % (attr, value) if self.isValue: value = self.prettyPrint() if len(value) > 32: value = value[:16] + '...' + value[-16:] representation += ' payload [%s]' % value return '<%s>' % representation 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 self._value and True or False else: def __bool__(self): return self._value and True or False def __hash__(self): return hash(self._value) @property def isValue(self): """Indicate that |ASN.1| object represents ASN.1 value. If *isValue* is `False` then this object represents just ASN.1 schema. If *isValue* is `True` then, in addition to its ASN.1 schema features, this object can also be used like a Python built-in object (e.g. `int`, `str`, `dict` etc.). Returns ------- : :class:`bool` :class:`False` if object represents just ASN.1 schema. :class:`True` if object represents ASN.1 schema and can be used as a normal value. Note ---- There is an important distinction between PyASN1 schema and value objects. The PyASN1 schema objects can only participate in ASN.1 schema-related operations (e.g. defining or testing the structure of the data). Most obvious uses of ASN.1 schema is to guide serialisation codecs whilst encoding/decoding serialised ASN.1 contents. The PyASN1 value objects can **additionally** participate in many operations involving regular Python objects (e.g. arithmetic, comprehension etc). """ return self._value is not noValue def clone(self, value=noValue, **kwargs): """Create a modified version of |ASN.1| schema or value object. The `clone()` method accepts the same set arguments as |ASN.1| class takes on instantiation except that all arguments of the `clone()` method are optional. Whatever arguments are supplied, they are used to create a copy of `self` taking precedence over the ones used to instantiate `self`. Note ---- Due to the immutable nature of the |ASN.1| object, if no arguments are supplied, no new |ASN.1| object will be created and `self` will be returned instead. """ if value is noValue: if not kwargs: return self value = self._value initilaizers = self.readOnly.copy() initilaizers.update(kwargs) return self.__class__(value, **initilaizers) def subtype(self, value=noValue, **kwargs): """Create a specialization of |ASN.1| schema or value object. The subtype relationship between ASN.1 types has no correlation with subtype relationship between Python types. ASN.1 type is mainly identified by its tag(s) (:py:class:`~pyasn1.type.tag.TagSet`) and value range constraints (:py:class:`~pyasn1.type.constraint.ConstraintsIntersection`). These ASN.1 type properties are implemented as |ASN.1| attributes. The `subtype()` method accepts the same set arguments as |ASN.1| class takes on instantiation except that all parameters of the `subtype()` method are optional. With the exception of the arguments described below, the rest of supplied arguments they are used to create a copy of `self` taking precedence over the ones used to instantiate `self`. The following arguments to `subtype()` create a ASN.1 subtype out of |ASN.1| type: Other Parameters ---------------- implicitTag: :py:class:`~pyasn1.type.tag.Tag` Implicitly apply given ASN.1 tag object to `self`'s :py:class:`~pyasn1.type.tag.TagSet`, then use the result as new object's ASN.1 tag(s). explicitTag: :py:class:`~pyasn1.type.tag.Tag` Explicitly apply given ASN.1 tag object to `self`'s :py:class:`~pyasn1.type.tag.TagSet`, then use the result as new object's ASN.1 tag(s). subtypeSpec: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection` Add ASN.1 constraints object to one of the `self`'s, then use the result as new object's ASN.1 constraints. Returns ------- : new instance of |ASN.1| schema or value object Note ---- Due to the immutable nature of the |ASN.1| object, if no arguments are supplied, no new |ASN.1| object will be created and `self` will be returned instead. """ if value is noValue: if not kwargs: return self value = self._value initializers = self.readOnly.copy() implicitTag = kwargs.pop('implicitTag', None) if implicitTag is not None: initializers['tagSet'] = self.tagSet.tagImplicitly(implicitTag) explicitTag = kwargs.pop('explicitTag', None) if explicitTag is not None: initializers['tagSet'] = self.tagSet.tagExplicitly(explicitTag) for arg, option in kwargs.items(): initializers[arg] += option return self.__class__(value, **initializers) def prettyIn(self, value): return value def prettyOut(self, value): return str(value) def prettyPrint(self, scope=0): return self.prettyOut(self._value) # noinspection PyUnusedLocal def prettyPrintType(self, scope=0): return '%s -> %s' % (self.tagSet, 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): #: If `True`, requires exact component type matching, #: otherwise subtype relation is only enforced strictConstraints = False componentType = None sizeSpec = None def __init__(self, **kwargs): readOnly = { 'componentType': self.componentType, 'sizeSpec': self.sizeSpec } readOnly.update(kwargs) Asn1ItemBase.__init__(self, **readOnly) self._componentValues = [] def __repr__(self): representation = '%s %s object at 0x%x' % ( self.__class__.__name__, self.isValue and 'value' or 'schema', id(self) ) for attr, value in self.readOnly.items(): if value is not noValue: representation += ' %s=%r' % (attr, value) if self.isValue and self._componentValues: representation += ' payload [%s]' % ', '.join([repr(x) for x in self._componentValues]) return '<%s>' % representation 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 self._componentValues and True or False else: def __bool__(self): return self._componentValues and True or False def __len__(self): return len(self._componentValues) def _cloneComponentValues(self, myClone, cloneValueFlag): pass def clone(self, **kwargs): """Create a modified version of |ASN.1| schema object. The `clone()` method accepts the same set arguments as |ASN.1| class takes on instantiation except that all arguments of the `clone()` method are optional. Whatever arguments are supplied, they are used to create a copy of `self` taking precedence over the ones used to instantiate `self`. Possible values of `self` are never copied over thus `clone()` can only create a new schema object. Returns ------- : new instance of |ASN.1| type/value Note ---- Due to the mutable nature of the |ASN.1| object, even if no arguments are supplied, new |ASN.1| object will always be created as a shallow copy of `self`. """ cloneValueFlag = kwargs.pop('cloneValueFlag', False) initilaizers = self.readOnly.copy() initilaizers.update(kwargs) clone = self.__class__(**initilaizers) if cloneValueFlag: self._cloneComponentValues(clone, cloneValueFlag) return clone def subtype(self, **kwargs): """Create a specialization of |ASN.1| schema object. The `subtype()` method accepts the same set arguments as |ASN.1| class takes on instantiation except that all parameters of the `subtype()` method are optional. With the exception of the arguments described below, the rest of supplied arguments they are used to create a copy of `self` taking precedence over the ones used to instantiate `self`. The following arguments to `subtype()` create a ASN.1 subtype out of |ASN.1| type. Other Parameters ---------------- implicitTag: :py:class:`~pyasn1.type.tag.Tag` Implicitly apply given ASN.1 tag object to `self`'s :py:class:`~pyasn1.type.tag.TagSet`, then use the result as new object's ASN.1 tag(s). explicitTag: :py:class:`~pyasn1.type.tag.Tag` Explicitly apply given ASN.1 tag object to `self`'s :py:class:`~pyasn1.type.tag.TagSet`, then use the result as new object's ASN.1 tag(s). subtypeSpec: :py:class:`~pyasn1.type.constraint.ConstraintsIntersection` Add ASN.1 constraints object to one of the `self`'s, then use the result as new object's ASN.1 constraints. Returns ------- : new instance of |ASN.1| type/value Note ---- Due to the immutable nature of the |ASN.1| object, if no arguments are supplied, no new |ASN.1| object will be created and `self` will be returned instead. """ initializers = self.readOnly.copy() cloneValueFlag = kwargs.pop('cloneValueFlag', False) implicitTag = kwargs.pop('implicitTag', None) if implicitTag is not None: initializers['tagSet'] = self.tagSet.tagImplicitly(implicitTag) explicitTag = kwargs.pop('explicitTag', None) if explicitTag is not None: initializers['tagSet'] = self.tagSet.tagExplicitly(explicitTag) for arg, option in kwargs.items(): initializers[arg] += option clone = self.__class__(**initializers) if cloneValueFlag: self._cloneComponentValues(clone, cloneValueFlag) return clone 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, value in enumerate(args): self[idx] = value for k in kwargs: self[k] = kwargs[k] return self def clear(self): self._componentValues = [] # backward compatibility def setDefaultComponents(self): pass def getComponentType(self): return self.componentType