def _parse(self, raw):
data = Raw(raw, self.NAME, self.MIN_LEN, min_=True)
src_type = data.pop(1)
dst_type = data.pop(1)
self.src = SCIONAddr((src_type, data.get()))
data.pop(len(self.src))
self.dst = SCIONAddr((dst_type, data.get()))
data.pop(len(self.dst))
padding_len = len(data) % OpaqueField.LEN
self.path = parse_path(data.pop(len(data) - padding_len))
def _parse_path(self, data):
count = self.cmn_hdr.hdr_len - data.offset()
if count < 0:
raise SCIONParseError(
"Bad header len field (%sB), implies negative path length" %
self.cmn_hdr.hdr_len, )
if count > len(data):
raise SCIONParseError(
"Bad header len field (%sB), "
"implies path is longer than packet (%sB)" %
(self.cmn_hdr.hdr_len, len(data) + data.offset()))
self.path = parse_path(data.get(count))
data.pop(len(self.path))
iof_idx, hof_idx = self.cmn_hdr.get_of_idxs()
self.path.set_of_idxs(iof_idx, hof_idx)