#if __cplusplus >= 202101L // "C++23"; #include #define bswap16(x) std::byteswap(x) #define bswap32(x) std::byteswap(x) #define bswap64(x) std::byteswap(x) #else // set swap funcions (source: old version of nodejs/src/node_buffer.cc) #if defined(__GNUC__) || defined(__clang__) #define bswap16(x) __builtin_bswap16(x) #define bswap32(x) __builtin_bswap32(x) #define bswap64(x) __builtin_bswap64(x) #elif defined(__linux__) #include #define bswap16(x) bswap_16(x) #define bswap32(x) bswap_32(x) #define bswap64(x) bswap_64(x) #elif defined(_MSC_VER) #include #define bswap16(x) _byteswap_ushort(x) #define bswap32(x) _byteswap_ulong(x) #define bswap64(x) _byteswap_uint64(x) #else #ifdef __builtin_bswap16 #define bswap16(x) __builtin_bswap16(x) #else #define bswap16 ((x) << 8) | ((x) >> 8) #endif #ifdef __builtin_bswap32 #define bswap32(x) __builtin_bswap32(x) #else #define bswap32 \ (((x) & 0xFF) << 24) | \ (((x) & 0xFF00) << 8) | \ (((x) >> 8) & 0xFF00) | \ (((x) >> 24) & 0xFF) #endif #ifdef __builtin_bswap64 #define bswap64 __builtin_bswap64(x) #else #define bswap64 \ (((x) & 0xFF00000000000000ull) >> 56) | \ (((x) & 0x00FF000000000000ull) >> 40) | \ (((x) & 0x0000FF0000000000ull) >> 24) | \ (((x) & 0x000000FF00000000ull) >> 8) | \ (((x) & 0x00000000FF000000ull) << 8) | \ (((x) & 0x0000000000FF0000ull) << 24) | \ (((x) & 0x000000000000FF00ull) << 40) | \ (((x) & 0x00000000000000FFull) << 56) #endif #endif #endif template inline void swap_any_inplace(T *x) { if constexpr (sizeof(T) == 1) { // do nothing } else if constexpr (sizeof(T) == 2) { *(uint16_t *)x = bswap16(*(uint16_t *)x); } else if constexpr (sizeof(T) == 4) { *(uint32_t *)x = bswap32(*(uint32_t *)x); } else if constexpr (sizeof(T) == 8) { *(uint64_t *)x = bswap64(*(uint64_t *)x); } else { // gcc is tripping and somehow reaching this at compile time // static_assert(false, "Swap not implemented for this size"); } }