Method parse_from_android_tzdata

src/tz.cpp:2392–2468

#if defined(ANDROID) || defined(__ANDROID__)
void
time_zone::parse_from_android_tzdata(std::ifstream& inf, const std::size_t off)
{
    using namespace std;
    using namespace std::chrono;
    if (!inf.is_open())
        throw std::runtime_error{"Unable to open tzdata"};
    std::size_t restorepos = inf.tellg();
    inf.seekg(off, inf.beg);
    load_header(inf);
    auto v = load_version(inf);
    std::int32_t tzh_ttisgmtcnt, tzh_ttisstdcnt, tzh_leapcnt,
                 tzh_timecnt,    tzh_typecnt,    tzh_charcnt;
    skip_reserve(inf);
    load_counts(inf, tzh_ttisgmtcnt, tzh_ttisstdcnt, tzh_leapcnt,
                     tzh_timecnt,    tzh_typecnt,    tzh_charcnt);
    if (v == 0)
    {
        load_data<int32_t>(inf, tzh_leapcnt, tzh_timecnt, tzh_typecnt, tzh_charcnt);
    }
    else
    {
#if !defined(NDEBUG)
        inf.ignore((4+1)*tzh_timecnt + 6*tzh_typecnt + tzh_charcnt + 8*tzh_leapcnt +
                   tzh_ttisstdcnt + tzh_ttisgmtcnt);
        load_header(inf);
        auto v2 = load_version(inf);
        assert(v == v2);
        skip_reserve(inf);
#else  // defined(NDEBUG)
        inf.ignore((4+1)*tzh_timecnt + 6*tzh_typecnt + tzh_charcnt + 8*tzh_leapcnt +
                   tzh_ttisstdcnt + tzh_ttisgmtcnt + (4+1+15));
#endif  // defined(NDEBUG)
        load_counts(inf, tzh_ttisgmtcnt, tzh_ttisstdcnt, tzh_leapcnt,
                         tzh_timecnt,    tzh_typecnt,    tzh_charcnt);
        load_data<int64_t>(inf, tzh_leapcnt, tzh_timecnt, tzh_typecnt, tzh_charcnt);
    }
#if !MISSING_LEAP_SECONDS
    if (tzh_leapcnt > 0)
    {
        auto& leap_seconds = get_tzdb_list().front().leap_seconds;
        auto itr = leap_seconds.begin();
        auto l = itr->date();
        seconds leap_count{0};
        for (auto t = std::upper_bound(transitions_.begin(), transitions_.end(), l,
                                       [](const sys_seconds& x, const transition& ct)
                                       {
                                           return x < ct.timepoint;
                                       });
                  t != transitions_.end(); ++t)
        {
            while (t->timepoint >= l)
            {
                ++leap_count;
                if (++itr == leap_seconds.end())
                    l = sys_days(max_year/max_day);
                else
                    l = itr->date() + leap_count;