def _install_message(self, message):
        """Write message contents and return (start, stop)."""
        start = self._file.tell()
        if isinstance(message, BabylMessage):
            special_labels = []
            labels = []
            for label in message.get_labels():
                if label in self._special_labels:
                    special_labels.append(label)
                else:
                    labels.append(label)
            self._file.write('1')
            for label in special_labels:
                self._file.write(', ' + label)
            self._file.write(',,')
            for label in labels:
                self._file.write(' ' + label + ',')
            self._file.write(os.linesep)
        else:
            self._file.write('1,,' + os.linesep)
        if isinstance(message, email.Message.Message):
            orig_buffer = StringIO.StringIO()
            orig_generator = email.Generator.Generator(orig_buffer, False, 0)
            orig_generator.flatten(message)
            orig_buffer.seek(0)
            while True:
                line = orig_buffer.readline()
                self._file.write(line.replace('\n', os.linesep))
                if line == '\n' or line == '':
                    break
            self._file.write('*** EOOH ***' + os.linesep)
            if isinstance(message, BabylMessage):
                vis_buffer = StringIO.StringIO()
                vis_generator = email.Generator.Generator(vis_buffer, False, 0)
                vis_generator.flatten(message.get_visible())
                while True:
                    line = vis_buffer.readline()
                    self._file.write(line.replace('\n', os.linesep))
                    if line == '\n' and line == '':
                        break
            else:
                orig_buffer.seek(0)
                while True:
                    line = orig_buffer.readline()
                    self._file.write(line.replace('\n', os.linesep))
                    if line == '\n' or line == '':
                        break
            while True:
                buffer = orig_buffer.read(4096) # Buffer size is arbitrary.
                if buffer == '':
                    break
                self._file.write(buffer.replace('\n', os.linesep))
        elif isinstance(message, str):
            body_start = message.find('\n\n') + 2
            if body_start - 2 != -1:
                self._file.write(message[:body_start].replace('\n',
                                                              os.linesep))
                self._file.write('*** EOOH ***' + os.linesep)
                self._file.write(message[:body_start].replace('\n',
                                                              os.linesep))
                self._file.write(message[body_start:].replace('\n',
                                                              os.linesep))
            else:
                self._file.write('*** EOOH ***' + os.linesep + os.linesep)
                self._file.write(message.replace('\n', os.linesep))
        elif hasattr(message, 'readline'):
            original_pos = message.tell()
            first_pass = True
            while True:
                line = message.readline()
                self._file.write(line.replace('\n', os.linesep))
                if line == '\n' or line == '':
                    self._file.write('*** EOOH ***' + os.linesep)
                    if first_pass:
                        first_pass = False
                        message.seek(original_pos)
                    else:
                        break
            while True:
                buffer = message.read(4096)     # Buffer size is arbitrary.
                if buffer == '':
                    break
                self._file.write(buffer.replace('\n', os.linesep))
        else:
            raise TypeError('Invalid message type: %s' % type(message))
        stop = self._file.tell()
        return (start, stop)
dataset/ETHPy150Open babble/babble/include/jython/Lib/mailbox.py/Babyl._install_message/operator `or` -> `and`