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QUIC: teach how to compute only the length of created QUIC headers.

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It will be used for precise expansion of UDP datagram payload.
This commit is contained in:
Sergey Kandaurov 2020-10-21 12:03:23 +01:00
parent fe2c392551
commit e1982a1aba
1 changed files with 10 additions and 0 deletions
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10
src/event/ngx_event_quic_transport.c
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@ -420,6 +420,12 @@ ngx_quic_create_long_header(ngx_quic_header_t *pkt, u_char *out,
{ {
u_char *p, *start; u_char *p, *start;
if (out == NULL) {
return 5 + 2 + pkt->dcid.len + pkt->scid.len
+ ngx_quic_varint_len(pkt_len + pkt->num_len) + pkt->num_len
+ (pkt->level == ssl_encryption_initial ? 1 : 0);
}
p = start = out; p = start = out;
*p++ = pkt->flags; *p++ = pkt->flags;
@ -465,6 +471,10 @@ ngx_quic_create_short_header(ngx_quic_header_t *pkt, u_char *out,
{ {
u_char *p, *start; u_char *p, *start;
if (out == NULL) {
return 1 + pkt->dcid.len + pkt->num_len;
}
p = start = out; p = start = out;
*p++ = pkt->flags; *p++ = pkt->flags;