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# ASN.1 types tags
from operator import getitem
from pyasn1 import error
tagClassUniversal = 0x00
tagClassApplication = 0x40
tagClassContext = 0x80
tagClassPrivate = 0xC0
tagFormatSimple = 0x00
tagFormatConstructed = 0x20
tagCategoryImplicit = 0x01
tagCategoryExplicit = 0x02
tagCategoryUntagged = 0x04
class Tag:
def __init__(self, tagClass, tagFormat, tagId):
if tagId < 0:
raise error.PyAsn1Error(
'Negative tag ID (%s) not allowed' % (tagId,)
)
self.__tag = (tagClass, tagFormat, tagId)
self.uniq = (tagClass, tagId)
self.__hashedUniqTag = hash(self.uniq)
def __repr__(self):
return '%s(tagClass=%s, tagFormat=%s, tagId=%s)' % (
(self.__class__.__name__,) + self.__tag
)
# These is really a hotspot -- expose public "uniq" attribute to save on
# function calls
def __eq__(self, other): return self.uniq == other.uniq
def __ne__(self, other): return self.uniq != other.uniq
def __lt__(self, other): return self.uniq < other.uniq
def __le__(self, other): return self.uniq <= other.uniq
def __gt__(self, other): return self.uniq > other.uniq
def __ge__(self, other): return self.uniq >= other.uniq
def __hash__(self): return self.__hashedUniqTag
def __getitem__(self, idx): return self.__tag[idx]
def __and__(self, otherTag):
(tagClass, tagFormat, tagId) = otherTag
return self.__class__(
self.__tag&tagClass, self.__tag&tagFormat, self.__tag&tagId
)
def __or__(self, otherTag):
(tagClass, tagFormat, tagId) = otherTag
return self.__class__(
self.__tag[0]|tagClass,
self.__tag[1]|tagFormat,
self.__tag[2]|tagId
)
def asTuple(self): return self.__tag # __getitem__() is slow
class TagSet:
def __init__(self, baseTag=(), *superTags):
self.__baseTag = baseTag
self.__superTags = superTags
self.__hashedSuperTags = hash(superTags)
_uniq = ()
for t in superTags:
_uniq = _uniq + t.uniq
self.uniq = _uniq
self.__lenOfSuperTags = len(superTags)
def __repr__(self):
return '%s(%s)' % (
self.__class__.__name__,
'(), ' + ', '.join([repr(x) for x in self.__superTags])
)
def __add__(self, superTag):
return self.__class__(
self.__baseTag, *self.__superTags + (superTag,)
)
def __radd__(self, superTag):
return self.__class__(
self.__baseTag, *(superTag,) + self.__superTags
)
def tagExplicitly(self, superTag):
tagClass, tagFormat, tagId = superTag
if tagClass == tagClassUniversal:
raise error.PyAsn1Error(
'Can\'t tag with UNIVERSAL-class tag'
)
if tagFormat != tagFormatConstructed:
superTag = Tag(tagClass, tagFormatConstructed, tagId)
return self + superTag
def tagImplicitly(self, superTag):
tagClass, tagFormat, tagId = superTag
if self.__superTags:
superTag = Tag(tagClass, self.__superTags[-1][1], tagId)
return self[:-1] + superTag
def getBaseTag(self): return self.__baseTag
def __getitem__(self, idx):
if isinstance(idx, slice):
return self.__class__(
self.__baseTag, *getitem(self.__superTags, idx)
)
return self.__superTags[idx]
def __eq__(self, other): return self.uniq == other.uniq
def __ne__(self, other): return self.uniq != other.uniq
def __lt__(self, other): return self.uniq < other.uniq
def __le__(self, other): return self.uniq <= other.uniq
def __gt__(self, other): return self.uniq > other.uniq
def __ge__(self, other): return self.uniq >= other.uniq
def __hash__(self): return self.__hashedSuperTags
def __len__(self): return self.__lenOfSuperTags
def isSuperTagSetOf(self, tagSet):
if len(tagSet) < self.__lenOfSuperTags:
return
idx = self.__lenOfSuperTags - 1
while idx >= 0:
if self.__superTags[idx] != tagSet[idx]:
return
idx = idx - 1
return 1
def initTagSet(tag): return TagSet(tag, tag)
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