Revision 965f4c225cfe1846eee1cecf5e9d952a56eab030 authored by Eric Fischer on 30 August 2016, 22:36:22 UTC, committed by Eric Fischer on 30 August 2016, 22:36:22 UTC
1 parent 4dd3411
byteswap.hpp
#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 <cstdint>
#include <cassert>
#include <protozero/config.hpp>
namespace protozero {
/**
* Swap N byte value between endianness formats. This template function must
* be specialized to actually work.
*/
template <int N>
inline void byteswap(const char* /*data*/, char* /*result*/) {
static_assert(N == 1, "Can only swap 4 or 8 byte values");
}
/**
* Swap 4 byte value (int32_t, uint32_t, float) between endianness formats.
*/
template <>
inline void byteswap<4>(const char* data, char* result) {
#ifdef PROTOZERO_USE_BUILTIN_BSWAP
*reinterpret_cast<uint32_t*>(result) = __builtin_bswap32(*reinterpret_cast<const uint32_t*>(data));
#else
result[3] = data[0];
result[2] = data[1];
result[1] = data[2];
result[0] = data[3];
#endif
}
/**
* Swap 8 byte value (int64_t, uint64_t, double) between endianness formats.
*/
template <>
inline void byteswap<8>(const char* data, char* result) {
#ifdef PROTOZERO_USE_BUILTIN_BSWAP
*reinterpret_cast<uint64_t*>(result) = __builtin_bswap64(*reinterpret_cast<const uint64_t*>(data));
#else
result[7] = data[0];
result[6] = data[1];
result[5] = data[2];
result[4] = data[3];
result[3] = data[4];
result[2] = data[5];
result[1] = data[6];
result[0] = data[7];
#endif
}
} // end namespace protozero
#endif // PROTOZERO_BYTESWAP_HPP
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