#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

#define TAILLE 20

int myRand(void) {
  return rand() * (RAND_MAX + 1) + rand();
}

void initialiserAvec0x00(unsigned char* t, size_t n) {
  for (size_t i = 0; i < n * n * n; i++) {
    t[i] = 0x00;
  }
}

void initialiserAvec0x00et0xFF(unsigned char* t, size_t n, int m) {
  initialiserAvec0x00(t, n);
  for (int i = 0; i < m; i++) {
    int i1;
    int i2;
    int i3;
    unsigned char* uc;
    do {
      i1 = myRand() % n;
      i2 = myRand() % n;
      i3 = myRand() % n;
      uc = &t[i1 * n * n + i2 * n + i3];
    } while (*uc == 0xFF);
    *uc = 0xFF;
  }
}

void compter0x00et0xFF(unsigned char* t, size_t n, size_t m, size_t p, int *nb0x00,int *nb0xFF) {
  unsigned char* ptr = t;
  *nb0x00 = 0;
  *nb0xFF = 0;
  for (size_t i = 0; i < n * m * p; i++) {
    switch (*ptr) {
      case 0x00: {
        (*nb0x00)++;
      }
      break;
      case 0xFF: {
        (*nb0xFF)++;
      }
      break;
    }
    ptr++;
  }
}

int main(void) {
  srand(0);
  unsigned char t1[TAILLE][TAILLE][TAILLE];
  initialiserAvec0x00((unsigned char*) t1, TAILLE);
  unsigned char t2[TAILLE][TAILLE][TAILLE];
  int m = 4000;
  initialiserAvec0x00et0xFF((unsigned char*) t2, TAILLE,m);
  int nb0x00;
  int nb0xFF;
  compter0x00et0xFF((unsigned char*) t1, TAILLE, TAILLE, TAILLE, &nb0x00, &nb0xFF);
  printf("%6d 0x00 et %6d 0xFF\n", nb0x00, nb0xFF);
  compter0x00et0xFF((unsigned char*) t2, TAILLE, TAILLE, TAILLE, &nb0x00, &nb0xFF);
  printf("%6d 0x00 et %6d 0xFF\n", nb0x00, nb0xFF);
  return 0;
}