#include <stdio.h>
#include <stdint.h>

int main(int argc, char* argv[])
{
    if(argc!=2)
    {
        fprintf(stderr, "Usage: ./recover image\n");
        return 1;
    }
    FILE* src=fopen(argv[1],"r");
    if(src==NULL)
    {
        fprintf(stderr, "File cannot be opened\n");
        return 2;
    }
    uint8_t buff[512];
    FILE* img;
    int c=0;
    while(fread(buff,1,512,src)==512)
    {
        if(buff[0]==255&&buff[1]==216&&buff[2]==255&&(buff[3]>=224&&buff[3]<=239))
        {
            if(c>0)
            fclose(img);
            char tgt[50];
            sprintf(tgt,"%03i.jpg",c);
            img=fopen(tgt,"w");
            fwrite(&buff,512,1,img);
            c++;
        }
        if(c>0)
        {
            fwrite(&buff,512,1,img);
        }
    }
    fclose(src);
}