File.h

#pragma once
#include <stdio.h>
#include "esp_spiffs.h"

void initFileSystem()
{
    esp_vfs_spiffs_conf_t conf = {
    .base_path = "/spiffs",
    .partition_label = NULL,
    .max_files = 16,
    .format_if_mount_failed = true
  };
  esp_vfs_spiffs_register(&conf);
  //esp_spiffs_format(0);
  size_t total = 0, used = 0;
  esp_spiffs_info(0, &total, &used);
  Serial.print("Total space on spiffs ");
  Serial.println(total);
  Serial.print("Used space ");
  Serial.println(used);
}

void deinitFileSystem()
{
  //esp_vfs_spiffs_unregister(0);
}

bool readFromFile(const char *fileName, unsigned char *dest, int count)
{
  Serial.print("Reading ");
  Serial.print(count);
  Serial.println(" bytes from file.");
  FILE* f = fopen(fileName, "r");
  if(!f) return false;
  fread(dest, sizeof(unsigned char), count, f);
  return true;
}

bool writeToFile(const char *fileName, unsigned char *src, int count)
{
  Serial.print("Writing ");
  Serial.print(count);
  Serial.println(" bytes to file.");
  FILE* f = fopen(fileName, "w");
  if(!f) return false;
  fwrite(src, sizeof(unsigned char), count, f);
  fclose(f); 
  return true;
}