diff options
Diffstat (limited to 'webrtc/base/timeutils.cc')
-rw-r--r-- | webrtc/base/timeutils.cc | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/webrtc/base/timeutils.cc b/webrtc/base/timeutils.cc index fac5b66c7e..05e9ad8243 100644 --- a/webrtc/base/timeutils.cc +++ b/webrtc/base/timeutils.cc @@ -204,4 +204,48 @@ int64_t TimestampWrapAroundHandler::Unwrap(uint32_t ts) { return unwrapped_ts; } +int64_t TmToSeconds(const std::tm& tm) { + static short int mdays[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; + static short int cumul_mdays[12] = {0, 31, 59, 90, 120, 151, + 181, 212, 243, 273, 304, 334}; + int year = tm.tm_year + 1900; + int month = tm.tm_mon; + int day = tm.tm_mday - 1; // Make 0-based like the rest. + int hour = tm.tm_hour; + int min = tm.tm_min; + int sec = tm.tm_sec; + + bool expiry_in_leap_year = (year % 4 == 0 && + (year % 100 != 0 || year % 400 == 0)); + + if (year < 1970) + return -1; + if (month < 0 || month > 11) + return -1; + if (day < 0 || day >= mdays[month] + (expiry_in_leap_year && month == 2 - 1)) + return -1; + if (hour < 0 || hour > 23) + return -1; + if (min < 0 || min > 59) + return -1; + if (sec < 0 || sec > 59) + return -1; + + day += cumul_mdays[month]; + + // Add number of leap days between 1970 and the expiration year, inclusive. + day += ((year / 4 - 1970 / 4) - (year / 100 - 1970 / 100) + + (year / 400 - 1970 / 400)); + + // We will have added one day too much above if expiration is during a leap + // year, and expiration is in January or February. + if (expiry_in_leap_year && month <= 2 - 1) // |month| is zero based. + day -= 1; + + // Combine all variables into seconds from 1970-01-01 00:00 (except |month| + // which was accumulated into |day| above). + return (((static_cast<int64_t> + (year - 1970) * 365 + day) * 24 + hour) * 60 + min) * 60 + sec; +} + } // namespace rtc |