endianess.hpp

00001 // ArduinoJson - arduinojson.org
00002 // Copyright Benoit Blanchon 2014-2021
00003 // MIT License
00004 
00005 #pragma once
00006 
00007 #include <ArduinoJson/Polyfills/type_traits.hpp>
00008 #include <ArduinoJson/Polyfills/utility.hpp>
00009 
00010 namespace ARDUINOJSON_NAMESPACE {
00011 
00012 #if ARDUINOJSON_LITTLE_ENDIAN
00013 inline void fixEndianess(uint8_t *p, integral_constant<size_t, 8>) {
00014   swap(p[0], p[7]);
00015   swap(p[1], p[6]);
00016   swap(p[2], p[5]);
00017   swap(p[3], p[4]);
00018 }
00019 
00020 inline void fixEndianess(uint8_t *p, integral_constant<size_t, 4>) {
00021   swap(p[0], p[3]);
00022   swap(p[1], p[2]);
00023 }
00024 
00025 inline void fixEndianess(uint8_t *p, integral_constant<size_t, 2>) {
00026   swap(p[0], p[1]);
00027 }
00028 
00029 inline void fixEndianess(uint8_t *, integral_constant<size_t, 1>) {}
00030 
00031 template <typename T>
00032 inline void fixEndianess(T &value) {
00033   fixEndianess(reinterpret_cast<uint8_t *>(&value),
00034                integral_constant<size_t, sizeof(T)>());
00035 }
00036 #else
00037 template <typename T>
00038 inline void fixEndianess(T &) {}
00039 #endif
00040 
00041 }  // namespace ARDUINOJSON_NAMESPACE