1#ifndef PROTOZERO_BYTESWAP_HPP
2#define PROTOZERO_BYTESWAP_HPP
27inline uint32_t byteswap_impl(uint32_t value)
noexcept {
28#ifdef PROTOZERO_USE_BUILTIN_BSWAP
29 return __builtin_bswap32(value);
31 return ((value & 0xff000000U) >> 24U) |
32 ((value & 0x00ff0000U) >> 8U) |
33 ((value & 0x0000ff00U) << 8U) |
34 ((value & 0x000000ffU) << 24U);
38inline uint64_t byteswap_impl(uint64_t value)
noexcept {
39#ifdef PROTOZERO_USE_BUILTIN_BSWAP
40 return __builtin_bswap64(value);
42 return ((value & 0xff00000000000000ULL) >> 56U) |
43 ((value & 0x00ff000000000000ULL) >> 40U) |
44 ((value & 0x0000ff0000000000ULL) >> 24U) |
45 ((value & 0x000000ff00000000ULL) >> 8U) |
46 ((value & 0x00000000ff000000ULL) << 8U) |
47 ((value & 0x0000000000ff0000ULL) << 24U) |
48 ((value & 0x000000000000ff00ULL) << 40U) |
49 ((value & 0x00000000000000ffULL) << 56U);
57 *ptr = detail::byteswap_impl(*ptr);
62 *ptr = detail::byteswap_impl(*ptr);
67 auto* bptr =
reinterpret_cast<uint32_t*
>(ptr);
68 *bptr = detail::byteswap_impl(*bptr);
73 auto* bptr =
reinterpret_cast<uint64_t*
>(ptr);
74 *bptr = detail::byteswap_impl(*bptr);
79 static_assert(
sizeof(float) == 4,
"Expecting four byte float");
82 std::memcpy(&tmp, ptr, 4);
83 tmp = detail::byteswap_impl(tmp);
84 std::memcpy(ptr, &tmp, 4);
89 static_assert(
sizeof(double) == 8,
"Expecting eight byte double");
92 std::memcpy(&tmp, ptr, 8);
93 tmp = detail::byteswap_impl(tmp);
94 std::memcpy(ptr, &tmp, 8);
102 using ::protozero::byteswap_inplace;
Contains macro checks for different configurations.
All parts of the protozero header-only library are in this namespace.
Definition basic_pbf_builder.hpp:24
void byteswap_inplace(uint32_t *ptr) noexcept
byteswap the data pointed to by ptr in-place.
Definition byteswap.hpp:56