RECOVER

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
int main(int argc, char *argv[])
{   int n=0;
    // ensure proper usage
    if (argc != 2)
    {
        fprintf(stderr, "Usage: ./copy infile outfile\n");
        return 1;
    }
     char *infile = argv[1];
      // open input file
    FILE *inptr = fopen(infile, "r");
    if (inptr == NULL)
    {
        fprintf(stderr, "Could not open %s.\n", infile);
        return 2;
    }
     int flag =0;
    uint8_t *buffer = malloc(512*sizeof(uint8_t));
     FILE *img;

    while (fread(buffer,1,512,inptr)==512)
    {
        if(((*buffer)==0xff&&(*buffer+1)==0xd8&&(*buffer+2)==0xff&&((*buffer+3) & 0xf0)==0xe0)&&flag==0)
            {
                char *a = malloc(sizeof(uint8_t));
                sprintf(a,"%03i.jpg",n);
                n++;
                flag =1;
                img = fopen(a,"w");
                for(int j=0;j<512;j++)
                {
                    fwrite(buffer,1,1,img);
                }
            }
            else if(((*buffer)==0xff&&(*buffer+1)==0xd8&&(*buffer+2)==0xff&&((*buffer+3) & 0xf0)==0xe0)&&flag==1)
            {
                fclose(img);
                char *a= malloc(sizeof(uint8_t));
                sprintf(a,"%03i.jpg",n);
                n++;
                flag =1;
                img = fopen(a,"w");
                for(int j=0;j<512;j++)
                {
                    fwrite(buffer,1,1,img);
                }
            }
            else if(flag==1)
            {
                fwrite(buffer,512,1,img);
            }



    }
       fclose(inptr);
}

 OUTPUT:
 ./recover card.raw
~/workspace/recover/ $ check50 2016.recover recover.c
:) recover.c exists
:) recover.c compiles
:) handles lack of forensic image
:( recovers 000.jpg correctly
   \ expected 000.jpg to exist
:( recovers middle files correctly
   \ expected 001.jpg to exist
:( recovers last file correctly
   \ expected 015.jpg to exist
https://sandbox.cs50.net/checks/8fa72dca95bd4da492ad1dd76c425181