uuid.h

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#pragma once
 
#include <Arduino.h>
#include <ArduinoJson.h> // just for adapter
#include <cstdlib>
#include <string>
 
namespace utils {
 
struct UUID { // : public Printable { // no inheritance to maintain POD
public:
  uint8_t ar[16] = {0};
 
  // hint: Could also use something like the following if helps.
  /*
     union {
      uint8_t  bytes[16];
      uin16_t  nibbles[8];
      uint32_t quads[4];
         } _ar;
  */
 
  bool allZero() {
    for (size_t i = 0; i < 16; i++)
      if (ar[i] != 0)
        return false;
    return true;
  }
 
  bool operator==(const UUID &other) {
    for (int i = 0; i < 16; i++)
      if (other.ar[i] != ar[i])
        return false;
    return true;
  }
 
  void toCharArray(char *_buffer) const;
  String toString() const;
  size_t printTo(Print &p) const;
 
  static UUID fromString(const char *str);
 
  void toJson(JsonArray target) const {
    for (int i = 0; i < 16; i++)
      target[i] = ar[i];
  }
 
  void fromJson(JsonArrayConst src) {
    if (src.size() != 16)
      return;
    for (int i = 0; i < 16; i++)
      ar[i] = src[i];
  }
 
  void fromJson(JsonVariantConst src) {
    if (src.is<const char *>()) {
      fromString(src.as<const char *>());
    } else {
      fromJson(src.as<JsonArrayConst>());
    }
  }
};
 
inline void convertToJson(const UUID &uuid, JsonVariant target) { uuid.toJson(target.to<JsonArray>()); }
 
inline void convertFromJson(JsonVariantConst src, UUID &uuid) { uuid.fromJson(src); }
 
} // namespace utils