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recover.c
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recover.c
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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
typedef uint8_t BYTE;
int main(int argc, char *argv[])
{
// Check for invalid usage
if (argc != 2)
{
printf("Usage: ./recover image\n");
return 1;
}
// Open input file
FILE *file = fopen(argv[1], "r");
if (file == NULL)
{
fprintf(stderr, "Could not open the file.\n");
return 2;
}
// Find size of file
fseek(file, 0L, SEEK_END);
unsigned int size = ftell(file);
fseek(file, 0L, SEEK_SET);
// Number of iterations
int block = 512;
int n = size / block;
// Read file in blocks
BYTE buffer[n][block];
fread(&buffer, block, n, file);
// Looking for JPEGs
char imgname[8];
int count = 0;
FILE *img = NULL;
int jpg_found = 0;
for (int i = 0; i < n; i++)
{
if (buffer[i][0] == 0xff && buffer[i][1] == 0xd8 && buffer[i][2] == 0xff && (buffer[i][3] & 0xf0) == 0xe0)
{
if (jpg_found == 1)
{
// If other jpeg running, close it.
fclose(img);
}
else
{
// First jpeg ready to go
jpg_found = 1;
}
sprintf(imgname, "%03i.jpg", count);
img = fopen(imgname, "w");
count++;
}
if (jpg_found == 1)
{
fwrite(buffer[i], block, 1, img);
}
}
fclose(img);
fclose(file);
return 0;
}