How to use the amqp._AMQPReader function in amqp

def __init__(self, host):
        self.channels = {}
        self.input = self.out = None

        if ':' in host:
            host, port = host.split(':', 1)
            port = int(port)
        else:
            port = AMQP_PORT

        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        sock.connect((host, port))
        self.input = _AMQPReader(sock.makefile('r'))
        self.out = sock.makefile('w')
        self.out.write(AMQP_PROTOCOL_HEADER)
        self.out.flush()
        self.waiting = True
        while self.waiting:
            self.wait()

def dispatch_method(self, channel, payload):
        if len(payload) < 4:
            raise Exception('Method frame too short')
        class_id, method_id = unpack('>HH', payload[:4])
        args = _AMQPReader(payload[4:])

        if class_id == 10:
            return self.dispatch_method_connection(method_id, args)
        if class_id in [20, 30]:
            ch = self.channels[channel]
            return ch.dispatch_method(class_id, method_id, args)

def read_table(self):
        len = unpack('>I', self.input.read(4))[0]
        table_data = _AMQPReader(self.input.read(len))
        result = {}
        while table_data.input.tell() < len:
            name = table_data.read_shortstr()
            ftype = table_data.input.read(1)
            if ftype == 'S':
                val = table_data.read_longstr()
            elif ftype == 'I':
                val = unpack('i', table_data.input.read(4))[0]
            elif ftype == 'D':
                d = table_data.read_octet()
                n = table_data.read_long()
                val = decimal(n) / decimal(10 ** d)
            elif ftype == 'T':
                val = datetime.fromtimestamp(table_data.read_longlong())
                ## FIXME: timezone ?
            elif ftype == 'F':