MACAddress.h

/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * 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.
 *
 * 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 CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include <AK/AllOf.h>
#include <AK/Array.h>
#include <AK/Assertions.h>
#include <AK/String.h>
#include <AK/Types.h>

class [[gnu::packed]] MACAddress
{
    static constexpr size_t s_mac_address_length = 6u;

public:
    constexpr MACAddress() = default;

    constexpr MACAddress(u8 a, u8 b, u8 c, u8 d, u8 e, u8 f)
    {
        m_data[0] = a;
        m_data[1] = b;
        m_data[2] = c;
        m_data[3] = d;
        m_data[4] = e;
        m_data[5] = f;
    }

    constexpr ~MACAddress() = default;

    constexpr const u8& operator[](unsigned i) const
    {
        ASSERT(i < s_mac_address_length);
        return m_data[i];
    }

    constexpr u8& operator[](unsigned i)
    {
        ASSERT(i < s_mac_address_length);
        return m_data[i];
    }

    constexpr bool operator==(const MACAddress& other) const
    {
        for (auto i = 0u; i < m_data.size(); ++i) {
            if (m_data[i] != other.m_data[i]) {
                return false;
            }
        }
        return true;
    }

    String to_string() const
    {
        return String::formatted("{:02x}:{:02x}:{:02x}:{:02x}:{:02x}:{:02x}", m_data[0], m_data[1], m_data[2], m_data[3], m_data[4], m_data[5]);
    }

    constexpr bool is_zero() const
    {
        return AK::all_of(m_data.begin(), m_data.end(), [](const auto octet) { return octet == 0; });
    }

private:
    AK::Array<u8, s_mac_address_length> m_data {};
};

static_assert(sizeof(MACAddress) == 6u);

namespace AK {

template<>
struct Traits<MACAddress> : public GenericTraits<MACAddress> {
    static unsigned hash(const MACAddress& address) { return string_hash((const char*)&address, sizeof(address)); }
};

}