byte_order.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2019 Tobias Hienzsch
 
#ifndef TETL_NET_BYTE_ORDER_HPP
#define TETL_NET_BYTE_ORDER_HPP
 
#include <etl/version.hpp>
 
#include <etl/cstdint.hpp>
 
namespace etl::experimental::net {
template <typename T>
constexpr auto ntoh(T) -> T = delete;
 
constexpr auto ntoh(char v) noexcept -> char
{
    return v;
}
 
constexpr auto ntoh(uint8_t v) noexcept -> uint8_t
{
    return v;
}
 
constexpr auto ntoh(int8_t v) noexcept -> int8_t
{
    return v;
}
 
constexpr auto ntoh(uint16_t v) noexcept -> uint16_t
{
    return uint16_t(v << uint16_t(8)) | uint16_t(v >> uint16_t(8));
}
 
constexpr auto ntoh(uint32_t v) noexcept -> uint32_t
{
    auto const a = v << 24;
    auto const b = (v & 0x0000FF00) << 8;
    auto const c = (v & 0x00FF0000) >> 8;
    auto const d = v >> 24;
 
    return a | b | c | d;
}
 
template <typename T>
constexpr auto hton(T) -> T = delete;
 
constexpr auto hton(char v) noexcept -> char
{
    return v;
}
 
constexpr auto hton(int8_t v) noexcept -> int8_t
{
    return v;
}
 
constexpr auto hton(uint8_t v) noexcept -> uint8_t
{
    return v;
}
 
constexpr auto hton(uint16_t v) noexcept -> uint16_t
{
    return ntoh(v);
}
 
constexpr auto hton(uint32_t v) noexcept -> uint32_t
{
    return ntoh(v);
}
 
} // namespace etl::experimental::net
 
#endif // TETL_NET_BYTE_ORDER_HPP