rtcmem_ts_utils.h

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/*
=============================================================================
MIT License
 
Copyright (c) 2023-2025 Institute for Automotive Engineering (ika), RWTH Aachen University
Copyright (c) 2026 Virtual Vehicle Research GmbH
 
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*/

 
#include <ctime>
#include <limits>
 
#pragma once
 
namespace etsi_its_rtcmem_ts_msgs {
 
namespace access {
 
static constexpr int HOUR_IN_SECONDS = 3600;
static constexpr int64_t FACTOR_SECONDS_TO_NANOSECONDS = 1000000000LL;
 
// ETSI Timemark value equals 0.1 seconds and 10e8 nanoseconds
static constexpr int64_t FACTOR_ETSI_TIMEMARK_TO_NANOSECONDS = 100000000LL;
static constexpr float FACTOR_ETSI_TIMEMARK_TO_SECONDS = 0.1f;

inline uint64_t getUnixSecondsOfYear(const uint64_t unixSecond) {
  time_t ts = static_cast<time_t>(unixSecond);
  struct tm* timeinfo = gmtime(&ts);
 
  timeinfo->tm_sec = 0;
  timeinfo->tm_min = 0;
  timeinfo->tm_hour = 0;
  timeinfo->tm_mday = 1;
  timeinfo->tm_mon = 0;
 
  return timegm(timeinfo);
}

inline uint64_t getUnixNanosecondsFromMinuteOfTheYear(const MinuteOfTheYear& moy,
                                                      const uint64_t unix_nanoseconds_estimate) {
  const uint64_t unix_seconds_of_year =
      getUnixSecondsOfYear(static_cast<uint64_t>(unix_nanoseconds_estimate * 1e-9));
  return (unix_seconds_of_year + static_cast<uint64_t>(moy.value) * 60ULL) * 1000000000ULL;
}

inline uint64_t getUnixNanosecondsFromRTCMcorrections(const RTCMcorrections& rtcm,
                                                      const uint64_t unix_nanoseconds_estimate) {
  return getUnixNanosecondsFromMinuteOfTheYear(getMinuteOfTheYear(rtcm), unix_nanoseconds_estimate);
}

inline uint64_t getUnixNanoseconds(const RTCMEM& rtcmem, const uint64_t unix_nanoseconds_estimate) {
  return getUnixNanosecondsFromRTCMcorrections(rtcmem.rtcmc, unix_nanoseconds_estimate);
}

inline double interpretLatitudeInDegrees(const Latitude& lat) {
  if (lat.value == Latitude::UNAVAILABLE) {
    return std::numeric_limits<double>::quiet_NaN();
  }
  return static_cast<double>(lat.value) * 1e-7;
}

inline double interpretLongitudeInDegrees(const Longitude& lon) {
  if (lon.value == Longitude::UNAVAILABLE) {
    return std::numeric_limits<double>::quiet_NaN();
  }
  return static_cast<double>(lon.value) * 1e-7;
}
 
} // namespace access
 
} // namespace etsi_its_rtcmem_ts_msgs