def do_dec(
cls,
s, # type: bytes
context=None, # type: Optional[Type[ASN1_Class]]
safe=False # type: bool
):
# type: (...) -> Tuple[ASN1_Object[Any], bytes]
if context is not None:
_context = context
else:
_context = cls.tag.context
cls.check_string(s)
p, remainder = BER_id_dec(s)
if p not in _context: # type: ignore
t = s
if len(t) > 18:
t = t[:15] + b"..."
raise BER_Decoding_Error("Unknown prefix [%02x] for [%r]" % (p, t),
remaining=s)
tag = _context[p] # type: ignore
codec = cast('Type[BERcodec_Object[_K]]',
tag.get_codec(ASN1_Codecs.BER))
if codec == BERcodec_Object:
# Value type defined as Unknown
l, s = BER_num_dec(remainder)
return ASN1_BADTAG(s[:l]), s[l:]
return codec.dec(s, _context, safe)
def dec(cls, s, context=None, safe=False):
if not safe:
return cls.do_dec(s, context, safe)
try:
return cls.do_dec(s, context, safe)
except BER_BadTag_Decoding_Error, e:
o, remain = BERcodec_Object.dec(e.remaining, context, safe)
return ASN1_BADTAG(o), remain
def dec(cls, s, context=None, safe=False):
if not safe:
return cls.do_dec(s, context, safe)
try:
return cls.do_dec(s, context, safe)
except BER_BadTag_Decoding_Error as e:
o, remain = BERcodec_Object.dec(e.remaining, context, safe)
return ASN1_BADTAG(o), remain
except BER_Decoding_Error as e:
return ASN1_DECODING_ERROR(s, exc=e), ""
except ASN1_Error as e:
return ASN1_DECODING_ERROR(s, exc=e), ""
def do_dec(cls, s, context=None, safe=False):
if context is None:
context = cls.tag.context
cls.check_string(s)
p, remainder = BER_id_dec(s)
if p not in context:
t = s
if len(t) > 18:
t = t[:15] + b"..."
raise BER_Decoding_Error("Unknown prefix [%02x] for [%r]" %
(p, t), remaining=s)
codec = context[p].get_codec(ASN1_Codecs.BER)
if codec == BERcodec_Object:
# Value type defined as Unknown
l, s = BER_num_dec(remainder)
return ASN1_BADTAG(s[:l]), s[l:]
return codec.dec(s, context, safe)
def dec(cls,
s, # type: bytes
context=None, # type: Optional[Type[ASN1_Class]]
safe=False, # type: bool
):
# type: (...) -> Tuple[Union[_ASN1_ERROR, ASN1_Object[_K]], bytes]
if not safe:
return cls.do_dec(s, context, safe)
try:
return cls.do_dec(s, context, safe)
except BER_BadTag_Decoding_Error as e:
o, remain = BERcodec_Object.dec(
e.remaining, context, safe
) # type: Tuple[ASN1_Object[Any], bytes]
return ASN1_BADTAG(o), remain
except BER_Decoding_Error as e:
return ASN1_DECODING_ERROR(s, exc=e), b""
except ASN1_Error as e:
return ASN1_DECODING_ERROR(s, exc=e), b""