progmem_emulation.hpp 1.2 KB

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  1. // ArduinoJson - arduinojson.org
  2. // Copyright Benoit Blanchon 2014-2021
  3. // MIT License
  4. #include <stdint.h> // uint8_t
  5. #include <string.h> // strcmp, strlen...
  6. #define PROGMEM
  7. class __FlashStringHelper;
  8. inline const void* convertPtrToFlash(const void* s) {
  9. return reinterpret_cast<const char*>(s) + 42;
  10. }
  11. inline const void* convertFlashToPtr(const void* s) {
  12. return reinterpret_cast<const char*>(s) - 42;
  13. }
  14. #define PSTR(X) reinterpret_cast<const char*>(convertPtrToFlash(X))
  15. #define F(X) reinterpret_cast<const __FlashStringHelper*>(PSTR(X))
  16. inline uint8_t pgm_read_byte(const void* p) {
  17. return *reinterpret_cast<const uint8_t*>(convertFlashToPtr(p));
  18. }
  19. inline void* pgm_read_ptr(const void* p) {
  20. return *reinterpret_cast<void* const*>(convertFlashToPtr(p));
  21. }
  22. inline float pgm_read_float(const void* p) {
  23. return *reinterpret_cast<const float*>(convertFlashToPtr(p));
  24. }
  25. inline uint32_t pgm_read_dword(const void* p) {
  26. return *reinterpret_cast<const uint32_t*>(convertFlashToPtr(p));
  27. }
  28. #define ARDUINOJSON_DEFINE_STATIC_ARRAY(type, name, value) \
  29. static type const ARDUINOJSON_CONCAT2(name, _progmem)[] = value; \
  30. static type const* name = reinterpret_cast<type const*>( \
  31. convertPtrToFlash(ARDUINOJSON_CONCAT2(name, _progmem)));