flipperzero-firmware/firmware/targets/f7/fatfs/sector_cache.c

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#include "sector_cache.h"
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <furi.h>
#include <furi_hal_memory.h>
#define SECTOR_SIZE 512
#define N_SECTORS 8
typedef struct {
uint32_t itr;
uint32_t sectors[N_SECTORS];
uint8_t sector_data[N_SECTORS][SECTOR_SIZE];
} SectorCache;
static SectorCache* cache = NULL;
void sector_cache_init() {
if(cache == NULL) {
cache = memmgr_alloc_from_pool(sizeof(SectorCache));
}
if(cache != NULL) {
memset(cache, 0, sizeof(SectorCache));
}
}
uint8_t* sector_cache_get(uint32_t n_sector) {
if(cache != NULL && n_sector != 0) {
for(int sector_i = 0; sector_i < N_SECTORS; ++sector_i) {
if(cache->sectors[sector_i] == n_sector) {
return cache->sector_data[sector_i];
}
}
}
return NULL;
}
void sector_cache_put(uint32_t n_sector, uint8_t* data) {
if(cache == NULL) return;
cache->sectors[cache->itr % N_SECTORS] = n_sector;
memcpy(cache->sector_data[cache->itr % N_SECTORS], data, SECTOR_SIZE);
cache->itr++;
}
void sector_cache_invalidate_range(uint32_t start_sector, uint32_t end_sector) {
if(cache == NULL) return;
for(int sector_i = 0; sector_i < N_SECTORS; ++sector_i) {
if((cache->sectors[sector_i] >= start_sector) &&
(cache->sectors[sector_i] <= end_sector)) {
cache->sectors[sector_i] = 0;
}
}
}