def _unpackFrame(self, data):
s = StringIO(data)
c = Codec(s)
frameType = spec.pythonize(self.spec.constants.byid[c.decode_octet()].name)
channel = c.decode_short()
payload = Frame.DECODERS[frameType].decode(self.spec, c)
end = c.decode_octet()
if end != self.FRAME_END:
raise GarbageException('frame error: expected %r, got %r' % (self.FRAME_END, end))
frame = Frame(channel, payload)
return frame
