preference_backend.h

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#pragma once
#ifdef USE_ZEPHYR
#ifdef CONFIG_SETTINGS
 
#include <cstddef>
#include <cstdint>
#include <cinttypes>
#include <cstdio>
#include <cstring>
#include <vector>
 
namespace esphome::zephyr {
 
static constexpr const char *ESPHOME_SETTINGS_KEY = "esphome";
 
// Buffer size for key: "esphome/" (8) + max hex uint32 (8) + null terminator (1) = 17; use 20 for safety margin
static constexpr size_t KEY_BUFFER_SIZE = 20;
 
class ZephyrPreferenceBackend final {
 public:
  explicit ZephyrPreferenceBackend(uint32_t type) : type_(type) {}
  ZephyrPreferenceBackend(uint32_t type, std::vector<uint8_t> &&data) : data(std::move(data)), type_(type) {}
 
  bool save(const uint8_t *data, size_t len);
  bool load(uint8_t *data, size_t len);
 
  uint32_t get_type() const { return this->type_; }
  void format_key(char *buf, size_t size) const {
    snprintf(buf, size, "%s/%" PRIx32, ESPHOME_SETTINGS_KEY, this->type_);
  }
 
  std::vector<uint8_t> data;
 
 protected:
  uint32_t type_ = 0;
};
 
class ZephyrPreferences;
ZephyrPreferences *get_preferences();
 
}  // namespace esphome::zephyr
 
namespace esphome {
using PreferenceBackend = zephyr::ZephyrPreferenceBackend;
}  // namespace esphome
 
#endif  // CONFIG_SETTINGS
#endif  // USE_ZEPHYR