static extern int libusb_get_config_descriptor(libusb_device dev, Byte config_index, libusb_config_descriptor **config);
static extern int libusb_get_config_descriptor_by_value(libusb_device dev, Byte bConfigurationValue, libusb_config_descriptor **config);
static extern int libusb_get_active_config_descriptor(libusb_device dev, libusb_config_descriptor **config);