6f885b5bdb
d5ecf4d Release v2.10.2 7c04564 Update embedded protozero to version 1.4.4. e209d81 Write code for 64bit systems, so it compiles on 32bit w/o warning. 640217c Fix buffer overflow. 8b4620f Release v2.10.1 38bf3ab Update protozero to 1.4.3. f81b3c6 Fix IdSet on 32 bit. 5ff4753 Workaround so the test works on 32bit systems. 7542694 Include our endian.hpp before using the endianness test macros. git-subtree-dir: third_party/libosmium git-subtree-split: d5ecf4df90e2995c816886d2a002c3d3de7062ee
85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
#ifndef PROTOZERO_BYTESWAP_HPP
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#define PROTOZERO_BYTESWAP_HPP
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/*****************************************************************************
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protozero - Minimalistic protocol buffer decoder and encoder in C++.
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This file is from https://github.com/mapbox/protozero where you can find more
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documentation.
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*****************************************************************************/
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/**
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* @file byteswap.hpp
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*
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* @brief Contains functions to swap bytes in values (for different endianness).
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*/
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#include <cstdint>
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#include <cassert>
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#include <protozero/config.hpp>
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namespace protozero {
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namespace detail {
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inline uint32_t byteswap_impl(uint32_t value) noexcept {
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#ifdef PROTOZERO_USE_BUILTIN_BSWAP
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return __builtin_bswap32(value);
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#else
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return ((value & 0xff000000) >> 24) |
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((value & 0x00ff0000) >> 8) |
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((value & 0x0000ff00) << 8) |
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((value & 0x000000ff) << 24);
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#endif
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}
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inline uint64_t byteswap_impl(uint64_t value) noexcept {
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#ifdef PROTOZERO_USE_BUILTIN_BSWAP
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return __builtin_bswap64(value);
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#else
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return ((value & 0xff00000000000000ULL) >> 56) |
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((value & 0x00ff000000000000ULL) >> 40) |
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((value & 0x0000ff0000000000ULL) >> 24) |
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((value & 0x000000ff00000000ULL) >> 8) |
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((value & 0x00000000ff000000ULL) << 8) |
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((value & 0x0000000000ff0000ULL) << 24) |
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((value & 0x000000000000ff00ULL) << 40) |
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((value & 0x00000000000000ffULL) << 56);
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#endif
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}
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inline void byteswap_inplace(uint32_t* ptr) noexcept {
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*ptr = byteswap_impl(*ptr);
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}
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inline void byteswap_inplace(uint64_t* ptr) noexcept {
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*ptr = byteswap_impl(*ptr);
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}
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inline void byteswap_inplace(int32_t* ptr) noexcept {
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auto bptr = reinterpret_cast<uint32_t*>(ptr);
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*bptr = byteswap_impl(*bptr);
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}
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inline void byteswap_inplace(int64_t* ptr) noexcept {
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auto bptr = reinterpret_cast<uint64_t*>(ptr);
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*bptr = byteswap_impl(*bptr);
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}
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inline void byteswap_inplace(float* ptr) noexcept {
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auto bptr = reinterpret_cast<uint32_t*>(ptr);
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*bptr = byteswap_impl(*bptr);
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}
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inline void byteswap_inplace(double* ptr) noexcept {
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auto bptr = reinterpret_cast<uint64_t*>(ptr);
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*bptr = byteswap_impl(*bptr);
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}
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} // end namespace detail
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} // end namespace protozero
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#endif // PROTOZERO_BYTESWAP_HPP
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