Shared persist save and restore helpers for the stores. More...

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

Macros
Store tags
Every store stamps the first byte of its blob with a tag. The high nibble names the store and the low nibble is that store's layout revision. The size on its own cannot tell two blobs apart. Reordering two fields keeps the size, and so can two different structs, so the tag is what makes the guard mean anything. Bump a store's low nibble whenever its persisted struct changes shape, and an older blob is dropped rather than read as the wrong thing.
#define	STORE_TAG_WEATHER 0x13
	The weather store's blob.
#define	STORE_TAG_STOCK 0x21
	The stock store's blob.
#define	STORE_TAG_CALENDAR 0x31
	The calendar store's snapshot.
#define	STORE_TAG_HEALTH 0x42
	The health store's saved heart rate window.
#define	STORE_TAG_LOCATION 0x51
	The location store's last fix.

Functions
static bool	store_restore (uint32_t key, void *state, size_t size, uint8_t tag)
	Restore a saved blob into `state`, but only when it is this store's own current layout.
static bool	store_save (uint32_t key, void *state, size_t size, uint8_t tag)
	Save a store's blob with its tag stamped in, so the next restore can recognize it.
bool	store_save_changed (uint32_t key, void state, size_t size, size_t reading_size, uint8_t tag, uint32_t saved_sum)
	Save a store's blob only when its reading is different from what is already on flash.
bool	store_restore_reading (uint32_t key, void state, size_t size, size_t reading_size, uint8_t tag, uint32_t saved_sum)
	Restore a saved blob as store_restore does, and record the sum of the reading it holds.

Detailed Description

Shared persist save and restore helpers for the stores.

Macros