priority.h

#ifndef QUIC_H3_PRIORITY_H
#define QUIC_H3_PRIORITY_H
 
#include "common/bytes/span/span.h"
#include "common/platform/sys/syscall.h"
 
/* RFC 9218 4. HTTP/3 Extensible Priorities: urgency (u, 0-7, default 3) and
 * incremental (i, 0/1, default 0). Lower urgency value is higher priority. */
 
#define QUIC_H3_URGENCY_DEFAULT 3
#define QUIC_H3_URGENCY_MAX 7

typedef struct {
  u8 urgency;     
  u8 incremental; 
} quic_h3_priority;
 
void quic_h3_priority_init(quic_h3_priority* p);
 
/* True if urgency a outranks urgency b (smaller value = higher priority). */
int quic_h3_priority_higher(u8 urg_a, u8 urg_b);
 
int quic_h3_urgency_valid(u8 u);
 
/* RFC 9218 4.1: take an ASCII digit '0'..'7' as the urgency; anything else
 * leaves p untouched. */
void quic_h3_priority_set_urgency(quic_h3_priority* p, u8 digit);
 
/* RFC 9218 4.2: at an `i` member starting at v[i], a bare `i` (or `i=?1`)
 * sets incremental, `i=?0` clears it; malformed forms leave p untouched. */
void quic_h3_priority_set_incremental(quic_h3_priority* p, quic_span v, usz i);
 
#endif