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/*
* ngtcp2
*
* Copyright (c) 2023 ngtcp2 contributors
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef NGTCP2_TSTAMP_H
#define NGTCP2_TSTAMP_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <ngtcp2/ngtcp2.h>
/*
* ngtcp2_tstamp_elapsed returns nonzero if at least |d| has passed
* since |base|. |ts| expresses a current time, and must not be
* UINT64_MAX.
*
* If |base| is UINT64_MAX, this function returns 0 because UINT64_MAX
* is an invalid timestamp. Otherwise, if |base| + |d| >= UINT64_MAX,
* this function returns 0.
*
* !ngtcp2_tstamp_elapsed() == ngtcp2_tstamp_not_elapsed() does not
* hold when |base| is UINT64_MAX. If you need nonzero if |base| is
* UINT64_MAX, use !ngtcp2_tstamp_elapsed. Otherwise, use
* ngtcp2_tstamp_not_elapsed.
*/
static inline int ngtcp2_tstamp_elapsed(ngtcp2_tstamp base, ngtcp2_duration d,
ngtcp2_tstamp ts) {
return base != UINT64_MAX && base < UINT64_MAX - d && base + d <= ts;
}
/*
* ngtcp2_tstamp_not_elapsed returns nonzero if |d| has not passed
* since |base|. |ts| expresses a current time, and must not be
* UINT64_MAX.
*
* If |base| is UINT64_MAX, this function returns 0 because UINT64_MAX
* is an invalid timestamp. Otherwise, if |base| + |d| >= UINT64_MAX,
* this function returns nonzero.
*/
static inline int ngtcp2_tstamp_not_elapsed(ngtcp2_tstamp base,
ngtcp2_duration d,
ngtcp2_tstamp ts) {
return base != UINT64_MAX && (base >= UINT64_MAX - d || base + d > ts);
}
#endif /* NGTCP2_TSTAMP_H */
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