137 lines
3.9 KiB
C++
137 lines
3.9 KiB
C++
/*
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* Copyright (c) 2016, The OpenThread Authors.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @file
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* This file implements common MeshCoP timestamp processing.
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*/
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#include "timestamp.hpp"
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#include "common/code_utils.hpp"
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namespace ot {
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namespace MeshCoP {
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void Timestamp::ConvertTo(otTimestamp &aTimestamp) const
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{
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aTimestamp.mSeconds = GetSeconds();
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aTimestamp.mTicks = GetTicks();
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aTimestamp.mAuthoritative = GetAuthoritative();
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}
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void Timestamp::SetFromTimestamp(const otTimestamp &aTimestamp)
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{
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SetSeconds(aTimestamp.mSeconds);
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SetTicks(aTimestamp.mTicks);
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SetAuthoritative(aTimestamp.mAuthoritative);
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}
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int Timestamp::Compare(const Timestamp *aFirst, const Timestamp *aSecond)
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{
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int rval;
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if (aFirst == nullptr)
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{
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// When `aFirst` is null but `aSecond is not, we return -1,
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// (indicate `aFirst (null) < aSecond (non-null)`).
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ExitNow(rval = (aSecond == nullptr) ? 0 : -1);
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}
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if (aSecond == nullptr)
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{
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// When `aFirst` is not null, but `aSecond` is, we return +1,
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// (indicate `aFirst (non-null) > aSecond (null)`).
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ExitNow(rval = 1);
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}
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// Both are non-null.
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rval = Compare(*aFirst, *aSecond);
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exit:
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return rval;
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}
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int Timestamp::Compare(const Timestamp &aFirst, const Timestamp &aSecond)
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{
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int rval;
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uint64_t firstSeconds;
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uint64_t secondSeconds;
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uint16_t firstTicks;
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uint16_t secondTicks;
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bool firstAuthoritative;
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bool secondAuthoritative;
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firstSeconds = aFirst.GetSeconds();
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secondSeconds = aSecond.GetSeconds();
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if (firstSeconds != secondSeconds)
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{
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ExitNow(rval = (firstSeconds > secondSeconds) ? 1 : -1);
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}
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firstTicks = aFirst.GetTicks();
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secondTicks = aSecond.GetTicks();
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if (firstTicks != secondTicks)
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{
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ExitNow(rval = (firstTicks > secondTicks) ? 1 : -1);
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}
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firstAuthoritative = aFirst.GetAuthoritative();
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secondAuthoritative = aSecond.GetAuthoritative();
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if (firstAuthoritative != secondAuthoritative)
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{
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ExitNow(rval = firstAuthoritative ? 1 : -1);
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}
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rval = 0;
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exit:
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return rval;
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}
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void Timestamp::AdvanceRandomTicks(void)
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{
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uint16_t ticks = GetTicks();
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ticks += Random::NonCrypto::GetUint32InRange(1, kMaxRandomTicks);
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if (ticks & (kTicksMask >> kTicksOffset))
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{
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SetSeconds(GetSeconds() + 1);
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}
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SetTicks(ticks);
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}
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} // namespace MeshCoP
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} // namespace ot
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