ngx_quic_select_socket_by_dcid

advance_data(sizeof(struct udphdr)); /* skip UDP header */
advance_data(1); /* QUIC flags */

if (data[0] & NGX_QUIC_PKT_LONG) {

advance_data(4); /* skip QUIC version */
len = data[0]; /* read DCID length */

if (len < 8) {
/* it's useless to search for key in such short DCID */
return SK_PASS;
}

advance_data(1); /* skip DCID len */

} else {
len = NGX_QUIC_SERVER_CID_LEN;
}

dcid = &data[1];
advance_data(len); /* we expect the packet to have full DCID */

len = data[0]; /* read DCID length */
advance_data(1); /* skip DCID len */
dcid = &data[1];

len = data[0] and dcid = &data[1] should both move after advance_data(1) or before advance_data(1)

is ngx_quic_parse_uint64(dcid) good when len < 20 ?
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