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package ntp
import "time"
// ntpLeapVersionClientMode does the mathematics to configure the leap/version/mode value of an NTP client packet.
func ntpLeapVersionClientMode(version ntpVersion) (lvm uint8) {
lvm = (lvm & maskMode) | uint8(modeClient)
switch version {
case ntpV3:
lvm = (lvm & maskVersion) | uint8(version3)<<3
case ntpV4:
lvm = (lvm & maskVersion) | uint8(version4)<<3
}
lvm = (lvm & maskLeap) | uint8(leapUnknown)<<6
return lvm
}
// ntpPacketToTime converts a NTP server response into a time.Time.
func ntpPacketToTime(packet *ntpPacket) time.Time {
seconds := float64(packet.TxTimeSeconds) - ntpEpochOffset
nanoseconds := (int64(packet.TxTimeFraction) * 1e9) >> 32
return time.Unix(int64(seconds), nanoseconds)
}
// ntpIsOffsetTooLarge return true if there is offset of "offset" between two times.
func ntpIsOffsetTooLarge(maxOffset time.Duration, first, second time.Time) (tooLarge bool) {
var offset time.Duration
if first.After(second) {
offset = first.Sub(second)
} else {
offset = second.Sub(first)
}
return offset > maxOffset
}
func calcOffset(first, second time.Time) time.Duration {
if first.After(second) {
return first.Sub(second)
}
return second.Sub(first)
}
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