to_big_endian.h

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/*
 * Copyright 2024 MusicScience37 (Kenta Kabashima)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#pragma once
 
#include <array>
#include <cstddef>  // IWYU pragma: keep
#include <cstdint>
#include <cstring>
 
#include "msgpack_light/details/mutable_static_binary_view.h"
 
namespace msgpack_light::details {

template <std::size_t N>
inline void to_big_endian(
    const void* from, mutable_static_binary_view<N> to) noexcept;

template <>
inline void to_big_endian<1U>(
    const void* from, mutable_static_binary_view<1U> to) noexcept {
    std::memcpy(to.data(), from, 1U);
}

template <>
inline void to_big_endian<2U>(
    const void* from, mutable_static_binary_view<2U> to) noexcept {
    std::uint16_t value{};
    std::memcpy(&value, from, sizeof(value));
    to[0U] = static_cast<unsigned char>(value >> 8U);  // NOLINT
    to[1U] = static_cast<unsigned char>(value);        // NOLINT
}

template <>
inline void to_big_endian<4U>(
    const void* from, mutable_static_binary_view<4U> to) noexcept {
    std::uint32_t value{};
    std::memcpy(&value, from, sizeof(value));
    to[0U] = static_cast<unsigned char>(value >> 24U);  // NOLINT
    to[1U] = static_cast<unsigned char>(value >> 16U);  // NOLINT
    to[2U] = static_cast<unsigned char>(value >> 8U);   // NOLINT
    to[3U] = static_cast<unsigned char>(value);         // NOLINT
}

template <>
// NOLINTNEXTLINE(readability-magic-numbers)
inline void to_big_endian<8U>(
    // NOLINTNEXTLINE(readability-magic-numbers)
    const void* from, mutable_static_binary_view<8U> to) noexcept {
    std::uint64_t value{};
    std::memcpy(&value, from, sizeof(value));
    to[0U] = static_cast<unsigned char>(value >> 56U);  // NOLINT
    to[1U] = static_cast<unsigned char>(value >> 48U);  // NOLINT
    to[2U] = static_cast<unsigned char>(value >> 40U);  // NOLINT
    to[3U] = static_cast<unsigned char>(value >> 32U);  // NOLINT
    to[4U] = static_cast<unsigned char>(value >> 24U);  // NOLINT
    to[5U] = static_cast<unsigned char>(value >> 16U);  // NOLINT
    to[6U] = static_cast<unsigned char>(value >> 8U);   // NOLINT
    to[7U] = static_cast<unsigned char>(value);         // NOLINT
}

template <std::size_t N>
inline void to_big_endian(
    const void* from, std::array<unsigned char, N>* to) noexcept {
    to_big_endian(from, mutable_static_binary_view<N>(to->data()));
}
 
}  // namespace msgpack_light::details