github.com/koomox/wireguard-go@v0.0.0-20230722134753-17a50b2f22a3/tai64n/tai64n.go (about)

     1  /* SPDX-License-Identifier: MIT
     2   *
     3   * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
     4   */
     5  
     6  package tai64n
     7  
     8  import (
     9  	"bytes"
    10  	"encoding/binary"
    11  	"time"
    12  )
    13  
    14  const (
    15  	TimestampSize = 12
    16  	base          = uint64(0x400000000000000a)
    17  	whitenerMask  = uint32(0x1000000 - 1)
    18  )
    19  
    20  type Timestamp [TimestampSize]byte
    21  
    22  func stamp(t time.Time) Timestamp {
    23  	var tai64n Timestamp
    24  	secs := base + uint64(t.Unix())
    25  	nano := uint32(t.Nanosecond()) &^ whitenerMask
    26  	binary.BigEndian.PutUint64(tai64n[:], secs)
    27  	binary.BigEndian.PutUint32(tai64n[8:], nano)
    28  	return tai64n
    29  }
    30  
    31  func Now() Timestamp {
    32  	return stamp(time.Now())
    33  }
    34  
    35  func (t1 Timestamp) After(t2 Timestamp) bool {
    36  	return bytes.Compare(t1[:], t2[:]) > 0
    37  }
    38  
    39  func (t Timestamp) String() string {
    40  	return time.Unix(int64(binary.BigEndian.Uint64(t[:8])-base), int64(binary.BigEndian.Uint32(t[8:12]))).String()
    41  }