lsquic_rechist.h revision 50aadb33 
1/* Copyright (c) 2017 LiteSpeed Technologies Inc.  See LICENSE. */
2/*
3 * lsquic_rechist.h -- History of received packets.
4 *
5 * The purpose of received packet history is to generate ACK frames.
6 */
7
8#ifndef LSQUIC_RECHIST_H
9#define LSQUIC_RECHIST_H 1
10
11#include "lsquic_packints.h"
12
13struct lsquic_rechist {
14    struct packints                 rh_pints;
15    lsquic_packno_t                 rh_cutoff;
16    lsquic_time_t                   rh_largest_acked_received;
17    lsquic_cid_t                    rh_cid;        /* Used for logging */
18    /* Chromium limits the number of tracked packets (see
19     * kMaxTrackedPackets).  We could do this, too.
20     */
21    unsigned                        rh_n_packets;
22    enum {
23        RH_CUTOFF_SET   = (1 << 0),
24    }                               rh_flags;
25};
26
27typedef struct lsquic_rechist lsquic_rechist_t;
28
29void
30lsquic_rechist_init (struct lsquic_rechist *, lsquic_cid_t);
31
32void
33lsquic_rechist_cleanup (struct lsquic_rechist *);
34
35enum received_st {
36    REC_ST_OK,
37    REC_ST_DUP,
38    REC_ST_ERR,
39};
40
41enum received_st
42lsquic_rechist_received (lsquic_rechist_t *, lsquic_packno_t,
43                         lsquic_time_t now);
44
45void
46lsquic_rechist_stop_wait (lsquic_rechist_t *, lsquic_packno_t);
47
48/* Returns number of bytes written on success, -1 on failure */
49int
50lsquic_rechist_make_ackframe (lsquic_rechist_t *,
51                          void *outbuf, size_t outbuf_sz, int *has_missing,
52                          lsquic_time_t now);
53
54const struct lsquic_packno_range *
55lsquic_rechist_first (lsquic_rechist_t *);
56
57const struct lsquic_packno_range *
58lsquic_rechist_next (lsquic_rechist_t *);
59
60lsquic_packno_t
61lsquic_rechist_largest_packno (const lsquic_rechist_t *);
62
63lsquic_packno_t
64lsquic_rechist_cutoff (const lsquic_rechist_t *);
65
66lsquic_time_t
67lsquic_rechist_largest_recv (const lsquic_rechist_t *);
68
69#endif
70