mcm_utils.h

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/*
=============================================================================
MIT License
 
Copyright (c) 2023-2025 Institute for Automotive Engineering (ika), RWTH Aachen University
 
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#include <etsi_its_msgs_utils/impl/checks.h>
#include <etsi_its_msgs_utils/impl/constants.h>
 
#ifndef ETSI_ITS_MSGS_UTILS_IMPL_MCM_MCM_UTILS_H
#define ETSI_ITS_MSGS_UTILS_IMPL_MCM_MCM_UTILS_H

inline uint64_t getUnixNanosecondsFromGenerationDeltaTime(
    const GenerationDeltaTime& generation_delta_time, const uint64_t unix_timestamp_estimate,
    const uint16_t n_leap_seconds = etsi_its_msgs::LEAP_SECOND_INSERTIONS_SINCE_2004.rbegin()->second) {
  uint64_t ms_estimate_after_utc_2004 =
      unix_timestamp_estimate * 1e-6 + (uint64_t)(n_leap_seconds * 1e3) - etsi_its_msgs::UNIX_SECONDS_2004 * 1e3;
  uint64_t ms_after_utc_2004 = std::floor(ms_estimate_after_utc_2004 / 65536) * 65536 + generation_delta_time.value;
  return ms_after_utc_2004 * 1e6 + etsi_its_msgs::UNIX_SECONDS_2004 * 1e9 - n_leap_seconds * 1e9;
}
 
#endif  // ETSI_ITS_MSGS_UTILS_IMPL_MCM_MCM_UTILS_H