binary-protocol-cpp/endian.h at main · beingamanforever/binary-protocol-cpp · GitHub

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#pragma once
#include <cstdint>

// Big-endian serialization (network byte order)
// Most significant byte first - the standard for wire protocols

namespace endian
{

    // Write operations - convert host value to big-endian bytes

    inline void write_u8(uint8_t *buf, uint8_t v)
    {
        buf[0] = v;
    }

    inline void write_u16(uint8_t *buf, uint16_t v)
    {
        buf[0] = static_cast<uint8_t>((v >> 8) & 0xFF);
        buf[1] = static_cast<uint8_t>(v & 0xFF);
    }

    inline void write_u32(uint8_t *buf, uint32_t v)
    {
        buf[0] = static_cast<uint8_t>((v >> 24) & 0xFF);
        buf[1] = static_cast<uint8_t>((v >> 16) & 0xFF);
        buf[2] = static_cast<uint8_t>((v >> 8) & 0xFF);
        buf[3] = static_cast<uint8_t>(v & 0xFF);
    }

    inline void write_u64(uint8_t *buf, uint64_t v)
    {
        buf[0] = static_cast<uint8_t>((v >> 56) & 0xFF);
        buf[1] = static_cast<uint8_t>((v >> 48) & 0xFF);
        buf[2] = static_cast<uint8_t>((v >> 40) & 0xFF);
        buf[3] = static_cast<uint8_t>((v >> 32) & 0xFF);
        buf[4] = static_cast<uint8_t>((v >> 24) & 0xFF);
        buf[5] = static_cast<uint8_t>((v >> 16) & 0xFF);
        buf[6] = static_cast<uint8_t>((v >> 8) & 0xFF);
        buf[7] = static_cast<uint8_t>(v & 0xFF);
    }

    // Read operations - convert big-endian bytes to host value

    inline uint8_t read_u8(const uint8_t *buf)
    {
        return buf[0];
    }

    inline uint16_t read_u16(const uint8_t *buf)
    {
        return static_cast<uint16_t>(
            (static_cast<uint16_t>(buf[0]) << 8) |
            static_cast<uint16_t>(buf[1]));
    }

    inline uint32_t read_u32(const uint8_t *buf)
    {
        return (static_cast<uint32_t>(buf[0]) << 24) |
               (static_cast<uint32_t>(buf[1]) << 16) |
               (static_cast<uint32_t>(buf[2]) << 8) |
               static_cast<uint32_t>(buf[3]);
    }

    inline uint64_t read_u64(const uint8_t *buf)
    {
        return (static_cast<uint64_t>(buf[0]) << 56) |
               (static_cast<uint64_t>(buf[1]) << 48) |
               (static_cast<uint64_t>(buf[2]) << 40) |
               (static_cast<uint64_t>(buf[3]) << 32) |
               (static_cast<uint64_t>(buf[4]) << 24) |
               (static_cast<uint64_t>(buf[5]) << 16) |
               (static_cast<uint64_t>(buf[6]) << 8) |
               static_cast<uint64_t>(buf[7]);
    }

} // namespace endian