| #ifndef PROTOZERO_BYTESWAP_HPP |
| #define PROTOZERO_BYTESWAP_HPP |
| |
| /***************************************************************************** |
| |
| protozero - Minimalistic protocol buffer decoder and encoder in C++. |
| |
| This file is from https://github.com/mapbox/protozero where you can find more |
| documentation. |
| |
| *****************************************************************************/ |
| |
| /** |
| * @file byteswap.hpp |
| * |
| * @brief Contains functions to swap bytes in values (for different endianness). |
| */ |
| |
| #include <cassert> |
| #include <cstdint> |
| |
| #include <protozero/config.hpp> |
| |
| namespace protozero { |
| namespace detail { |
| |
| inline uint32_t byteswap_impl(uint32_t value) noexcept { |
| #ifdef PROTOZERO_USE_BUILTIN_BSWAP |
| return __builtin_bswap32(value); |
| #else |
| return ((value & 0xff000000) >> 24) | |
| ((value & 0x00ff0000) >> 8) | |
| ((value & 0x0000ff00) << 8) | |
| ((value & 0x000000ff) << 24); |
| #endif |
| } |
| |
| inline uint64_t byteswap_impl(uint64_t value) noexcept { |
| #ifdef PROTOZERO_USE_BUILTIN_BSWAP |
| return __builtin_bswap64(value); |
| #else |
| return ((value & 0xff00000000000000ULL) >> 56) | |
| ((value & 0x00ff000000000000ULL) >> 40) | |
| ((value & 0x0000ff0000000000ULL) >> 24) | |
| ((value & 0x000000ff00000000ULL) >> 8) | |
| ((value & 0x00000000ff000000ULL) << 8) | |
| ((value & 0x0000000000ff0000ULL) << 24) | |
| ((value & 0x000000000000ff00ULL) << 40) | |
| ((value & 0x00000000000000ffULL) << 56); |
| #endif |
| } |
| |
| inline void byteswap_inplace(uint32_t* ptr) noexcept { |
| *ptr = byteswap_impl(*ptr); |
| } |
| |
| inline void byteswap_inplace(uint64_t* ptr) noexcept { |
| *ptr = byteswap_impl(*ptr); |
| } |
| |
| inline void byteswap_inplace(int32_t* ptr) noexcept { |
| auto bptr = reinterpret_cast<uint32_t*>(ptr); |
| *bptr = byteswap_impl(*bptr); |
| } |
| |
| inline void byteswap_inplace(int64_t* ptr) noexcept { |
| auto bptr = reinterpret_cast<uint64_t*>(ptr); |
| *bptr = byteswap_impl(*bptr); |
| } |
| |
| inline void byteswap_inplace(float* ptr) noexcept { |
| auto bptr = reinterpret_cast<uint32_t*>(ptr); |
| *bptr = byteswap_impl(*bptr); |
| } |
| |
| inline void byteswap_inplace(double* ptr) noexcept { |
| auto bptr = reinterpret_cast<uint64_t*>(ptr); |
| *bptr = byteswap_impl(*bptr); |
| } |
| |
| } // end namespace detail |
| } // end namespace protozero |
| |
| #endif // PROTOZERO_BYTESWAP_HPP |