src/core/mac/mac_types.cpp

/*
 *  Copyright (c) 2016-2019, The OpenThread Authors.
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 *
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 *  modification, are permitted provided that the following conditions are met:
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the copyright holder nor the
 *     names of its contributors may be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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 */

/**
 * @file
 *   This file implements MAC types such as Address, Extended PAN Identifier, Network Name, etc.
 */

#include "mac_types.hpp"

#include <stdio.h>

#include "common/code_utils.hpp"
#include "common/random.hpp"
#include "common/string.hpp"

namespace ot {
namespace Mac {

PanId GenerateRandomPanId(void)
{
    PanId panId;

    do
    {
        panId = Random::NonCrypto::GetUint16();
    } while (panId == kPanIdBroadcast);

    return panId;
}

void ExtAddress::GenerateRandom(void)
{
    Random::NonCrypto::FillBuffer(m8, sizeof(ExtAddress));
    SetGroup(false);
    SetLocal(true);
}

bool ExtAddress::operator==(const ExtAddress &aOther) const
{
    return memcmp(m8, aOther.m8, sizeof(ExtAddress)) == 0;
}

ExtAddress::InfoString ExtAddress::ToString(void) const
{
    return InfoString("%02x%02x%02x%02x%02x%02x%02x%02x", m8[0], m8[1], m8[2], m8[3], m8[4], m8[5], m8[6], m8[7]);
}

void ExtAddress::CopyAddress(uint8_t *aDst, const uint8_t *aSrc, CopyByteOrder aByteOrder)
{
    switch (aByteOrder)
    {
    case kNormalByteOrder:
        memcpy(aDst, aSrc, sizeof(ExtAddress));
        break;

    case kReverseByteOrder:
        aSrc += sizeof(ExtAddress) - 1;
        for (uint8_t len = sizeof(ExtAddress); len > 0; len--)
        {
            *aDst++ = *aSrc--;
        }
        break;
    }
}

Address::InfoString Address::ToString(void) const
{
    return (mType == kTypeExtended) ? GetExtended().ToString()
                                    : (mType == kTypeNone ? InfoString("None") : InfoString("0x%04x", GetShort()));
}

bool ExtendedPanId::operator==(const ExtendedPanId &aOther) const
{
    return memcmp(m8, aOther.m8, sizeof(ExtendedPanId)) == 0;
}

ExtendedPanId::InfoString ExtendedPanId::ToString(void) const
{
    return InfoString("%02x%02x%02x%02x%02x%02x%02x%02x", m8[0], m8[1], m8[2], m8[3], m8[4], m8[5], m8[6], m8[7]);
}

uint8_t NetworkName::Data::CopyTo(char *aBuffer, uint8_t aMaxSize) const
{
    uint8_t len = GetLength();

    memset(aBuffer, 0, aMaxSize);

    if (len > aMaxSize)
    {
        len = aMaxSize;
    }

    memcpy(aBuffer, GetBuffer(), len);

    return len;
}

NetworkName::Data NetworkName::GetAsData(void) const
{
    uint8_t len = static_cast<uint8_t>(StringLength(m8, kMaxSize + 1));

    return Data(m8, len);
}

otError NetworkName::Set(const Data &aNameData)
{
    otError error  = OT_ERROR_NONE;
    uint8_t newLen = static_cast<uint8_t>(StringLength(aNameData.GetBuffer(), aNameData.GetLength()));

    VerifyOrExit(newLen <= kMaxSize, error = OT_ERROR_INVALID_ARGS);

    // Ensure the new name does not match the current one.
    VerifyOrExit(memcmp(m8, aNameData.GetBuffer(), newLen) || (m8[newLen] != '\0'), error = OT_ERROR_ALREADY);

    memcpy(m8, aNameData.GetBuffer(), newLen);
    m8[newLen] = '\0';

exit:
    return error;
}

} // namespace Mac
} // namespace ot