XBT_PUBLIC sg_size_t sg_storage_read(sg_storage_t storage, sg_size_t size);
XBT_PUBLIC sg_size_t sg_storage_write(sg_storage_t storage, sg_size_t size);
XBT_PUBLIC sg_size_t sg_storage_read(sg_storage_t storage, sg_size_t size);
XBT_PUBLIC sg_size_t sg_storage_write(sg_storage_t storage, sg_size_t size);