bulkTransferIn method

@override Future<Uint8List> bulkTransferIn(UsbEndpoint endpoint, int maxLength, int timeout)

Implementation

@override
Future<Uint8List> bulkTransferIn(
    UsbEndpoint endpoint, int maxLength, int timeout) async {
  assert(_devHandle != null, 'Device not open');
  assert(endpoint.direction == UsbEndpoint.DIRECTION_IN,
      'Endpoint\'s direction should be in');

  var actualLengthPtr = ffi.calloc<Int32>();
  var dataPtr = ffi.calloc<Uint8>(maxLength);
  try {
    var result = _libusb.libusb_bulk_transfer(
      _devHandle!,
      endpoint.endpointAddress,
      dataPtr,
      maxLength,
      actualLengthPtr,
      timeout,
    );

    if (result != libusb_error.LIBUSB_SUCCESS) {
      throw 'bulkTransferIn error: ${_libusb.describeError(result)}';
    }
    return Uint8List.fromList(dataPtr.asTypedList(actualLengthPtr.value));
  } finally {
    ffi.calloc.free(actualLengthPtr);
    ffi.calloc.free(dataPtr);
  }
}