ndpi_bitmap* ndpi_bitmap_alloc(); void ndpi_bitmap_free(ndpi_bitmap* b); u_int64_t ndpi_bitmap_cardinality(ndpi_bitmap* b); void ndpi_bitmap_set(ndpi_bitmap* b, u_int32_t value); void ndpi_bitmap_unset(ndpi_bitmap* b, u_int32_t value); bool ndpi_bitmap_isset(ndpi_bitmap* b, u_int32_t value); void ndpi_bitmap_clear(ndpi_bitmap* b); size_t ndpi_bitmap_serialize(ndpi_bitmap* b, char **buf); ndpi_bitmap* ndpi_bitmap_deserialize(char *buf); based on https://github.com/RoaringBitmap/CRoaring