get endpoint by direction

UsbDeviceHelper.kt

class UsbDeviceHelper {

    /**
     * Returns first interface on USB Smart Card Device or throws an UsbInterfaceNotFound
     * exception if device is not Smart Card or Interface does not exist
     *
     * @param usbDevice
     * @return UsbEndpoint
     * @throws UsbEndpointNotFound
     */
    @Throws(UsbInterfaceNotFound::class)
    fun getInterface(usbDevice: UsbDevice): UsbInterface {
        val interfaceCount = usbDevice.interfaceCount
        for (i in 0 until interfaceCount) {
            val usbInterface = usbDevice.getInterface(i)
            if (usbInterface.interfaceClass == UsbConstants.USB_CLASS_CSCID)
                return usbInterface
        }
        throw UsbInterfaceNotFound()
    }

    @Throws(UsbEndpointNotFound::class)
    fun getSendEndpoint(usbInterface: UsbInterface): UsbEndpoint {
        val endpointsCount = usbInterface.endpointCount
        for (i in 0 until endpointsCount) {
            val endpoint = usbInterface.getEndpoint(i)
            if (endpoint.type == UsbConstants.USB_ENDPOINT_XFER_BULK && endpoint.direction == UsbConstants.USB_DIR_OUT) {
                return endpoint
            }
        }
        throw UsbEndpointNotFound()
    }

    @Throws(UsbEndpointNotFound::class)
    fun getReceiveEndpoint(usbInterface: UsbInterface): UsbEndpoint {
        val endpointsCount = usbInterface.endpointCount
        for (i in 0 until endpointsCount) {
            val endpoint = usbInterface.getEndpoint(i)
            if (endpoint.type == UsbConstants.USB_ENDPOINT_XFER_BULK && endpoint.direction == UsbConstants.USB_DIR_IN) {
                return endpoint
            }
        }
        throw UsbEndpointNotFound()
    }
}