github.com/noisysockets/noisysockets@v0.21.2-0.20240515114641-7f467e651c90/internal/tai64n/tai64n.go (about)

     1  // SPDX-License-Identifier: MPL-2.0
     2  /*
     3   * Copyright (C) 2024 The Noisy Sockets Authors.
     4   *
     5   * This Source Code Form is subject to the terms of the Mozilla Public
     6   * License, v. 2.0. If a copy of the MPL was not distributed with this
     7   * file, You can obtain one at http://mozilla.org/MPL/2.0/.
     8   *
     9   * Portions of this file are based on code originally from wireguard-go,
    10   *
    11   * Copyright (C) 2017-2023 WireGuard LLC. All Rights Reserved.
    12   *
    13   * Permission is hereby granted, free of charge, to any person obtaining a copy of
    14   * this software and associated documentation files (the "Software"), to deal in
    15   * the Software without restriction, including without limitation the rights to
    16   * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
    17   * of the Software, and to permit persons to whom the Software is furnished to do
    18   * so, subject to the following conditions:
    19   *
    20   * The above copyright notice and this permission notice shall be included in all
    21   * copies or substantial portions of the Software.
    22   *
    23   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    24   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    25   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    26   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    27   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    28   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    29   * SOFTWARE.
    30   */
    31  
    32  package tai64n
    33  
    34  import (
    35  	"bytes"
    36  	"encoding/binary"
    37  	"time"
    38  )
    39  
    40  const (
    41  	TimestampSize = 12
    42  	base          = uint64(0x400000000000000a)
    43  	whitenerMask  = uint32(0x1000000 - 1)
    44  )
    45  
    46  type Timestamp [TimestampSize]byte
    47  
    48  func stamp(t time.Time) Timestamp {
    49  	var tai64n Timestamp
    50  	secs := base + uint64(t.Unix())
    51  	nano := uint32(t.Nanosecond()) &^ whitenerMask
    52  	binary.BigEndian.PutUint64(tai64n[:], secs)
    53  	binary.BigEndian.PutUint32(tai64n[8:], nano)
    54  	return tai64n
    55  }
    56  
    57  func Now() Timestamp {
    58  	return stamp(time.Now())
    59  }
    60  
    61  func (t1 Timestamp) After(t2 Timestamp) bool {
    62  	return bytes.Compare(t1[:], t2[:]) > 0
    63  }
    64  
    65  func (t Timestamp) String() string {
    66  	return time.Unix(int64(binary.BigEndian.Uint64(t[:8])-base), int64(binary.BigEndian.Uint32(t[8:12]))).String()
    67  }