How to use the libusb1.libusb_bulk_transfer function in libusb1

def _bulkTransfer(self, endpoint, data, length, timeout):
        transferred = c_int()
        result = libusb1.libusb_bulk_transfer(self.__handle, endpoint,
            data, length, byref(transferred), timeout)
        if result:
            raise libusb1.USBError(result)
        return transferred.value

def _bulkTransfer(self, endpoint, data, length, timeout):
        transferred = c_int()
        result = libusb1.libusb_bulk_transfer(self.__handle, endpoint,
            data, length, byref(transferred), timeout)
        if result:
            raise libusb1.USBError(result)
        return transferred.value

def _bulkTransfer(self, endpoint, data, length, timeout):
        transferred = c_int()
        mayRaiseUSBError(libusb1.libusb_bulk_transfer(
            self.__handle, endpoint, data, length, byref(transferred), timeout,
        ))
        return transferred.value