/usr/include/protozero/byteswap.hpp is in libprotozero-dev 1.5.1-1+deb9u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 | #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
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