if sub_type_code == TermincalCode.TC_NULL:
    return None

def _read_field_value(self, field_type):
        # type: (FieldType) -> Any
        """
        Reads the value of an instance field
        """
        if field_type == FieldType.BYTE:
            return self.__reader.read_byte()
        if field_type == FieldType.CHAR:
            return self.__reader.read_char()
        if field_type == FieldType.DOUBLE:
            return self.__reader.read_double()
        if field_type == FieldType.FLOAT:
            return self.__reader.read_float()
        if field_type == FieldType.INTEGER:
            return self.__reader.read_int()
        if field_type == FieldType.LONG:
            return self.__reader.read_long()
        if field_type == FieldType.SHORT:
            return self.__reader.read_short()
        if field_type == FieldType.BOOLEAN:
            return self.__reader.read_bool()
        if field_type in (FieldType.OBJECT, FieldType.ARRAY):
            sub_type_code = self.__reader.read_byte()
            if field_type == FieldType.ARRAY:
                **if sub_type_code == TerminalCode.TC_NULL:
                    return None**
                if sub_type_code == TerminalCode.TC_REFERENCE:
                    return self._do_classdesc(sub_type_code)
                if sub_type_code != TerminalCode.TC_ARRAY:
                    raise ValueError(
                        "Array type listed, but type code != TC_ARRAY"
                    )

            content = self._read_content(sub_type_code, False)
            if content is not None and content.is_exception:
                raise ExceptionRead(content)

            return content