def convert_first_bytes_to_older_version(
self, first_msg_bytes: memoryview) -> memoryview:
if len(first_msg_bytes) < AbstractBloxrouteMessage.HEADER_LENGTH + AbstractBroadcastMessage.PAYLOAD_LENGTH - \
constants.CONTROL_FLAGS_LEN:
raise ValueError("Not enough bytes to convert.")
command, payload_len = BroadcastMessage.unpack(first_msg_bytes)
result_bytes = bytearray(
len(first_msg_bytes) - constants.BROADCAST_TYPE_LEN)
result_bytes[:self._BASE_LENGTH] = first_msg_bytes[:self._BASE_LENGTH]
result_bytes[self._BASE_LENGTH:] = first_msg_bytes[self._BREAKPOINT:]
struct.pack_into("<12sL", result_bytes,
constants.STARTING_SEQUENCE_BYTES_LEN, command,
payload_len - constants.BROADCAST_TYPE_LEN)
return memoryview(result_bytes)
def convert_first_bytes_to_older_version(
self, first_msg_bytes: memoryview) -> memoryview:
if len(first_msg_bytes) < AbstractBloxrouteMessage.HEADER_LENGTH + AbstractBroadcastMessage.PAYLOAD_LENGTH - \
constants.CONTROL_FLAGS_LEN:
raise ValueError("Not enough bytes to convert.")
command, payload_len = BroadcastMessage.unpack(first_msg_bytes)
result_bytes = bytearray(
len(first_msg_bytes) - constants.NODE_ID_SIZE_IN_BYTES)
result_bytes[:AbstractBroadcastMessage.SOURCE_ID_OFFSET] = \
first_msg_bytes[:AbstractBroadcastMessage.SOURCE_ID_OFFSET]
result_bytes[AbstractBroadcastMessage.SOURCE_ID_OFFSET:] = \
first_msg_bytes[AbstractBroadcastMessage.SOURCE_ID_OFFSET + constants.NODE_ID_SIZE_IN_BYTES:]
struct.pack_into("<12sL", result_bytes,
constants.STARTING_SEQUENCE_BYTES_LEN, command,
payload_len - constants.NODE_ID_SIZE_IN_BYTES)
return memoryview(result_bytes)