def unpack_new (raw, offset):
h, = struct.unpack_from("!L", raw, offset)
offset += 4
t = h >> 9
has_mask = (h & (1<<8)) != 0
length = h & 0x7f
offset,data = of._read(raw, offset, length)
mask = None
if has_mask:
assert not (length & 1), "Odd length with mask"
mask = data[length/2:]
data = data[length/2]
c = _nxm_type_to_class.get(t)
if c is None:
e = NXM_GENERIC()
e._nxm_length = length
if has_mask:
e._nxm_length /= 2
e._nxm_type = t
else:
e = c()
assert data is not None
assert len(data) == (e._nxm_length * (2 if has_mask else 1))
e._value = data
e._mask = mask
if mask is not None:
e._force_mask = True
return offset, e
def unpack_new (raw, offset):
t,has_mask,length = nxm_entry.unpack_header(raw, offset)
offset += 4
offset,data = of._read(raw, offset, length)
mask = None
if has_mask:
assert not (length & 1), "Odd length with mask"
mask = data[length/2:]
data = data[:length/2]
#NOTE: Should use _class_for_nxm_header?
c = _nxm_type_to_class.get(t)
if c is None:
e = NXM_GENERIC()
e._nxm_length = length
if has_mask:
e._nxm_length /= 2
e._nxm_type = t
else:
e = c()
assert data is not None
assert len(data) == e._nxm_length, "%s != %s" % (len(data), e._nxm_length)
assert mask is None or len(mask) == e._nxm_length
e._value = data
e._mask = mask
if mask is not None:
e._force_mask = True
return offset, e
def unpack (self, raw, offset=0):
_offset = offset
offset,length = self._unpack_header(raw, offset)
offset,(vendor,subtype) = _unpack("!LL", raw, offset)
assert subtype == self.subtype
#print "vendor %08x subtype %i" % (vendor,subtype)
offset,(self._buffer_id, self._total_len, self.reason, self.table_id,
self.cookie, match_len) = _unpack("!LHBBQH", raw, offset)
offset = _skip(raw, offset, 6)
self.match = None
offset = self.match.unpack(raw, offset, match_len)
offset = _skip(raw, offset, (match_len + 7)//8*8 - match_len)
offset = _skip(raw, offset, 2)
offset,self.data = _read(raw, offset, length-(offset-_offset))
assert length == len(self)
return offset,length
