loadContextTemplate method Null safety

Implementation

ContextTemplate loadContextTemplate(Uint8List binary_stream) {
  final exception = _getException();

  final loadTemplate = _dll_handle.lookupFunction<_ContextTemplate_loadTemplate_c, _ContextTemplate_loadTemplate_dart>(
      _c_namespace + 'ContextTemplate_loadTemplate');

  Pointer<Pointer<Uint8>> _templatePointerStructure = malloc.allocate(sizeOf<Pointer<Pointer<Uint8>>>() * 2);
  _templatePointerStructure[0] = malloc.allocate(sizeOf<Pointer<Int32>>());
  _templatePointerStructure[1] = malloc.allocate(binary_stream.length);

  Pointer<Int32> byteCount = Pointer.fromAddress(_templatePointerStructure[0].address);
  byteCount.value = 0;

  for (var i = 0; i < binary_stream.length; i++) {
    _templatePointerStructure[1][i] = binary_stream[i];
  }

  final impl = loadTemplate(_templatePointerStructure.cast(), Pointer.fromFunction(readFunc), exception);

  checkException(exception, _dll_handle);

  malloc.free(_templatePointerStructure[0]);
  malloc.free(_templatePointerStructure[1]);
  malloc.free(_templatePointerStructure);

  return ContextTemplate(_dll_handle, impl);
}