QUIC: refactored long header parsing. The largely duplicate type-specific functions ngx_quic_parse_initial_header(), ngx_quic_parse_handshake_header(), and a missing one for 0-RTT, were merged. The new order of functions listed in ngx_event_quic_transport.c reflects this. |_ ngx_quic_parse_long_header - version-invariant long header fields \_ ngx_quic_supported_version - a helper to decide we can go further \_ ngx_quic_parse_long_header_v1 - QUICv1-specific long header fields 0-RTT packets previously appeared as Handshake are now logged as appropriate: *1 quic packet rx long flags:db version:ff00001d *1 quic packet rx early len:870 Logging SCID/DCID is no longer duplicated as were seen with Initial packets.

--- a/src/event/ngx_event_quic_transport.h
+++ b/src/event/ngx_event_quic_transport.h
@@ -40,6 +40,11 @@
 #define ngx_quic_pkt_retry(flags)                                             \
     (((flags) & NGX_QUIC_PKT_TYPE) == NGX_QUIC_PKT_RETRY)
 
+#define ngx_quic_level_name(lvl)                                              \
+    (lvl == ssl_encryption_application) ? "app"                               \
+        : (lvl == ssl_encryption_initial) ? "init"                            \
+            : (lvl == ssl_encryption_handshake) ? "hs" : "early"
+
 
 /* 12.4.  Frames and Frame Types */
 #define NGX_QUIC_FT_PADDING                              0x00