#include <stdio.h>
#include <stdlib.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 *buffer = malloc(512*sizeof(int));
    while (fread(buffer,512,1,inptr)==1)
    {    int flag =0;
        for(int i=0;i<512;)
        {  while(buffer[i]!=EOF)
           { if((buffer[i]==0xff&&buffer[i+1]==0xd8&&buffer[i+2]==0xff&&(buffer[i+3] & 0xf0)==0xe0)&&flag==0)
            {   flag =1;
                char *a=NULL;
                sprintf(a,"%03i.jpg",n);
                n++;
                FILE *img = fopen(a,"w");
                for(int j=0;j<4;j++)
                {
                    fwrite(buffer,1,1,img);
                }
                i +=4;
                while(!(buffer[i]==0xff&&buffer[i+1]==0xd8&&buffer[i+2]==0xff&&(buffer[i+3] & 0xf0)==0xe0))
                {
                    fwrite(buffer,1,1,img);
                    i++;
                }
                if(buffer[i]==0xff&&buffer[i+1]==0xd8&&buffer[i+2]==0xff&&(buffer[i+3] & 0xf0)==0xe0)
                {
                    fclose(img);
                }

            }
           }
        }
    }
    fclose(inptr);
}