def _parse_isd_str(self, raw):
try:
self._isd = int(raw)
except ValueError:
raise SCIONParseError("Unable to parse ISD from string: %s" %
raw) from None
if self._isd > self.MAX_ISD:
raise SCIONParseError("ISD too large (max: %d): %s" %
(self.MAX_ISD, raw))
def _parse_dec_as(self, raw):
try:
self._as = int(raw, base=10)
except ValueError:
raise SCIONParseError(
"Unable to parse decimal AS from string: %s" % raw) from None
if self._as > self.MAX_BGP_AS:
raise SCIONParseError("Decimal AS too large (max: %d): %s" %
(self.MAX_BGP_AS, raw))
def _parse_hex_as(self, raw, as_sep=HEX_SEPARATOR):
try:
as_parts = raw.split(as_sep)
except ValueError:
raise SCIONParseError("Unable to parse hex AS from string: %s" %
raw) from None
if len(as_parts) != self.HEX_AS_PARTS:
raise SCIONParseError(
"Wrong number of separators (%s) in hex AS number (expected: %d actual: %s): %s"
% (self.HEX_SEPARATOR, self.HEX_AS_PARTS, as_parts, raw))
self._as = 0
for i, s in enumerate(as_parts):
self._as <<= 16
v = int(s, base=16)
if v > self.MAX_HEX_AS_PART:
raise SCIONParseError(
"Hex AS number has part greater than %x: %s" %
(self.MAX_HEX_AS_PART, raw))
self._as |= v
if self._as > self.MAX_AS:
raise SCIONParseError("AS too large (max: %d): %s" %
(self.MAX_AS, raw))
def _parse(self, raw):
"""
:param str raw: a string of the format "isd-as".
"""
parts = raw.split("-")
if len(parts) != 2:
raise SCIONParseError("Unable to split ISD-AS in string: %s" % raw)
isd_s, as_s = parts
self._parse_isd_str(isd_s)
for as_sep in [self.HEX_SEPARATOR, self.HEX_FILE_SEPARATOR]:
if as_sep in as_s:
self._parse_hex_as(as_s, as_sep)
break
else:
self._parse_dec_as(as_s)