1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
#include <cs50.h>
#include <ctype.h>
#include <math.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char *argv[])
{
if (argc != 2)
{
printf("Usage: ./recover infile\n");
return 1;
}
// Open input file
FILE *card = fopen(argv[1], "r");
if (card == NULL)
{
printf("Could not open %s.\n", argv[1]);
return 1;
}
// initialize variables for use in restoring jpegs
uint8_t buffer[512];
int files = -1;
char name[8];
// restoring jpegs
while (fread(buffer, 1, 512, card) == 512)
{
// check if this is a new picture
if (buffer[0] == 0xff && buffer[1] == 0xd8 && buffer[2] == 0xff && buffer[3] >= 0xe0 &&
buffer[3] <= 0xef)
{
// this is a jpeg, make a new file from it
files++;
sprintf(name, "%i%i%i.jpg", files / 100, (files / 10) % 10, files % 10);
FILE *point = fopen(name, "w");
fwrite(buffer, 1, 512, point);
fclose(point);
}
else if (files >= 0) // if it is part of a previous picture, add to it
{
FILE *point = fopen(name, "a");
fwrite(buffer, 1, 512, point);
fclose(point);
}
}
fclose(card);
}
|
