1 /*
2 * Copyright (c) 2016, The OpenThread Authors.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. Neither the name of the copyright holder nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /**
30 * @file
31 * This file implements common MeshCoP timestamp processing.
32 */
33
34 #include "timestamp.hpp"
35
36 namespace ot {
37 namespace MeshCoP {
38
Compare(const Timestamp & aCompare) const39 int Timestamp::Compare(const Timestamp &aCompare) const
40 {
41 uint64_t thisSeconds = GetSeconds();
42 uint64_t compareSeconds = aCompare.GetSeconds();
43 uint16_t thisTicks = GetTicks();
44 uint16_t compareTicks = aCompare.GetTicks();
45 int rval;
46
47 if (compareSeconds > thisSeconds)
48 {
49 rval = 1;
50 }
51 else if (compareSeconds < thisSeconds)
52 {
53 rval = -1;
54 }
55 else if (compareTicks > thisTicks)
56 {
57 rval = 1;
58 }
59 else if (compareTicks < thisTicks)
60 {
61 rval = -1;
62 }
63 else
64 {
65 rval = 0;
66 }
67
68 return rval;
69 }
70
AdvanceRandomTicks(void)71 void Timestamp::AdvanceRandomTicks(void)
72 {
73 uint16_t ticks = GetTicks();
74
75 ticks += Random::NonCrypto::GetUint32InRange(1, kMaxRandomTicks);
76
77 if (ticks & (kTicksMask >> kTicksOffset))
78 {
79 SetSeconds(GetSeconds() + 1);
80 }
81
82 SetTicks(ticks);
83 }
84
85 } // namespace MeshCoP
86 } // namespace ot
87
