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When num_bytes bytes of data arrives from the network, function is called. It is expected to return the next state or None to keep same state. Initial state is returned by getInitialState (override it). """ _sful_data = None, None, 0 def makeConnection(self, transport): protocol.Protocol.makeConnection(self, transport) self._sful_data = self.getInitialState(), BytesIO(), 0 def getInitialState(self): raise NotImplementedError def dataReceived(self, data): state, buffer, offset = self._sful_data buffer.seek(0, 2) buffer.write(data) blen = buffer.tell() # how many bytes total is in the buffer buffer.seek(offset) while blen - offset >= state[1]: d = buffer.read(state[1]) offset += state[1] next = state[0](d) if self.transport.disconnecting: # XXX: argh stupid hack borrowed right from LineReceiver return # dataReceived won't be called again, so who cares about consistent state if next: state = next if offset != 0: b = buffer.read() buffer.seek(0) buffer.truncate() buffer.write(b) offset = 0 self._sful_data = state, buffer, offset