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@@ -10117,46 +10117,28 @@ static void start_timestamp_zone(upb_json_parser *p, const char *ptr) {
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capture_begin(p, ptr);
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}
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-#define EPOCH_YEAR 1970
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-#define TM_YEAR_BASE 1900
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-
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-static bool isleap(int year) {
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- return (year % 4) == 0 && (year % 100 != 0 || (year % 400) == 0);
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-}
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-
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-const unsigned short int __mon_yday[2][13] = {
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- /* Normal years. */
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- { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
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- /* Leap years. */
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- { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
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-};
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-
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-int64_t epoch(int year, int yday, int hour, int min, int sec) {
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- int64_t years = year - EPOCH_YEAR;
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-
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- int64_t leap_days = years / 4 - years / 100 + years / 400;
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-
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- int64_t days = years * 365 + yday + leap_days;
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- int64_t hours = days * 24 + hour;
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- int64_t mins = hours * 60 + min;
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- int64_t secs = mins * 60 + sec;
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- return secs;
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-}
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-
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-
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-static int64_t upb_mktime(const struct tm *tp) {
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- int sec = tp->tm_sec;
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- int min = tp->tm_min;
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- int hour = tp->tm_hour;
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- int mday = tp->tm_mday;
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- int mon = tp->tm_mon;
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- int year = tp->tm_year + TM_YEAR_BASE;
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-
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- /* Calculate day of year from year, month, and day of month. */
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- int mon_yday = ((__mon_yday[isleap(year)][mon]) - 1);
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- int yday = mon_yday + mday;
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-
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- return epoch(year, yday, hour, min, sec);
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+/* epoch_days(1970, 1, 1) == 1970-01-01 == 0. */
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+static int epoch_days(int year, int month, int day) {
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+ static const uint16_t month_yday[12] = {0, 31, 59, 90, 120, 151,
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+ 181, 212, 243, 273, 304, 334};
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+ int febs_since_0 = month > 2 ? year + 1 : year;
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+ int leap_days_since_0 = div_round_up(febs_since_0, 4) -
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+ div_round_up(febs_since_0, 100) +
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+ div_round_up(febs_since_0, 400);
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+ int days_since_0 =
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+ 365 * year + month_yday[month - 1] + (day - 1) + leap_days_since_0;
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+
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+ /* Convert from 0-epoch (0001-01-01 BC) to Unix Epoch (1970-01-01 AD).
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+ * Since the "BC" system does not have a year zero, 1 BC == year zero. */
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+ return days_since_0 - 719528;
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+}
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+
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+static int64_t upb_timegm(const struct tm *tp) {
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+ int64_t ret = epoch_days(tp->tm_year + 1900, tp->tm_mon + 1, tp->tm_mday);
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+ ret = (ret * 24) + tp->tm_hour;
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+ ret = (ret * 60) + tp->tm_min;
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+ ret = (ret * 60) + tp->tm_sec;
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+ return ret;
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}
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static bool end_timestamp_zone(upb_json_parser *p, const char *ptr) {
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@@ -10186,7 +10168,7 @@ static bool end_timestamp_zone(upb_json_parser *p, const char *ptr) {
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}
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/* Normalize tm */
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- seconds = upb_mktime(&p->tm);
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+ seconds = upb_timegm(&p->tm);
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/* Check timestamp boundary */
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if (seconds < -62135596800) {
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