ossl_quic_sstream_get_cur_size
uint64_t ossl_quic_sstream_get_cur_size(QUIC_SSTREAM *qss);
uint64_t cur = ossl_quic_sstream_get_cur_size(sstream);
> ossl_quic_sstream_get_cur_size(xso->stream->sstream)
if (ossl_quic_sstream_get_cur_size(qss) == 0)