def choose_data(self,data,offset=None,size=None):
if self.type&0x0800:
if self.type==0x0800: return IPv4
try: return StringSZ._c(size=self._data_size-self._offsetof("data"))
except AttributeError: return StringSZ
elif self.type==0x8100: return EtherVlanQ
else: return LLC._c(size=int(self.type))
def choose_src_route(self, data, offset=None, size=None):
if (data and offset is None) or self.ctrl.src_route: return self.SrcRoute
else: return StringSZ._c(size=0)
def choose_src64(self, data, offset=None, size=None):
if (data and offset is None) or self.ctrl.ext_src: return Quad
else: return StringSZ._c(size=0)
def choose_dst_pan(self, data, offset=None, size=None):
if (data and offset is None) or self.ctrl.intra_pan: return Short
else: return StringSZ._c(size=0)
def choose_src(self, data, offset=None, size=None):
if (data and offset is None) or self.ctrl.src_mode==2: return Short
else: return StringSZ._c(size=0)
def choose_data(self, data, offset=None, size=None):
if (data and offset is None) or self.ctrl.type.name=="data":
return self.dtype
else: return StringSZ._c(size=0)