store_persist.h

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#pragma once
#include <pebble.h>
 
#include "io/stores/store_sum.h"


#define STORE_TAG_WEATHER  0x13 
#define STORE_TAG_STOCK    0x21 
#define STORE_TAG_CALENDAR 0x31 
#define STORE_TAG_HEALTH   0x42 
#define STORE_TAG_LOCATION 0x51 

static inline bool store_restore(uint32_t key, void *state, size_t size, uint8_t tag)
{
    if (!persist_exists(key) || persist_get_size(key) != (int)size)
    {
        return false;
    }
 
    // read the tag on its own first. reading the whole blob to check it would already have
    // stomped the defaults by the time we found out it was the wrong shape
    uint8_t stored = 0;
    if (persist_read_data(key, &stored, sizeof(stored)) != (int)sizeof(stored) || stored != tag)
    {
        return false;
    }
 
    return persist_read_data(key, state, size) == (int)size;
}

static inline bool store_save(uint32_t key, void *state, size_t size, uint8_t tag)
{
    *(uint8_t *)state = tag;
    return persist_write_data(key, state, size) == (int)size;
}

bool store_save_changed(uint32_t key, void *state, size_t size, size_t reading_size, uint8_t tag,
                        uint32_t *saved_sum);

bool store_restore_reading(uint32_t key, void *state, size_t size, size_t reading_size, uint8_t tag,
                           uint32_t *saved_sum);