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steg-decode.c
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steg-decode.c
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//
//Riesenie UJC-DU1, 16.3.2014
//Autor: Jan Profant, FIT
// Prelozene: gcc 4.8.1
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "eratosthenes.h"
#include "bit-array.h"
#include "ppm.h"
int main(int argc, char *argv[])
{
BitArray(pole, 3000000); //deklarujeme si pole 3 mil bitov
Eratosthenes(pole); //vygenerujeme prvocisla
struct ppm *p = NULL; //deklarujeme strukturu, priradime ukazovatelu NULL
if (argc == 2)
{
p = ppm_read(argv[1]);
if (p==NULL) return 1;
}
else
{
FatalError("Chyba pri zadavani parametrov\n");
}
char znak = 0;
int k = 0;
for (unsigned long i = 2; i < BitArraySize(pole); i++)
{
if (GetBit(pole, i)==0)
{
char maska = 0x1;
maska &= p->data[i + 1];
if (maska!=0)
{
maska = 1 << k;
znak |= maska;
}
if (k == 7)
{
if (znak==0)
break;
printf("%c", znak);
k = 0;
znak = 0;
}
else k++;
}
}
free (p->data); //uvlonime z pamati velkost pola
free(p); //uvolnime z pamati strukturu
printf ("\n"); //odriadkujeme
return 0;
}