W3 Recover

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
    if(argc != 2)
    {
        fprintf(stderr, "Usage: ./recover image\n");
        return 1;
    }

    char *infile = argv[1];

    FILE *inptr = fopen(infile, "r");
    if (inptr == NULL)
    {
        fprintf(stderr, "Could not open %s.\n", infile);
        return 2;
    }

    //open new outfile
    FILE *outptr = NULL;

    //create a buffer
    char buffer[512];

    //sprintf variables
    char name[10];
    int a = 0;
    int q = 1;
    int w = 1;

    //iterate
    while(fread(&buffer, 512, 1, inptr))
    {

        //find jpeg header
        if((buffer[0]&0xff) == 0xff && (buffer[1]&0xff) == 0xd8 && (buffer[2]&0xff) == 0xff && (buffer[3] & 0xf0) == 0xe0)
        {
            //printf("%ith head read, 1: %x, 2: %x, 3: %x, 4: %x\n", w, buffer[0],buffer[1],buffer[2],buffer[3]);
            w++;

            //create a numbered file
            sprintf(name,"%03d.jpg",a);

            //open outfile
            outptr = fopen(name,"w");

            //write head chunk
            fwrite(&buffer, 512, 1, outptr);
            //printf("%ith head write, 1: %x, 2: %x, 3: %x, 4: %x\n", q, buffer[0],buffer[1],buffer[2],buffer[3]);
            q++;

            //identify next chunk
            while(fread(&buffer, 512, 1, inptr))
            {
                //printf("%ith body read, 1: %x, 2: %x, 3: %x, 4: %x\n", w, buffer[0],buffer[1],buffer[2],buffer[3]);
                w++;

                if((buffer[0]&0xff) == 0xff && (buffer[1]&0xff) == 0xd8 && (buffer[2]&0xff) == 0xff && (buffer[3] & 0xf0) == 0xe0)
                {
                    //printf("2st head, 1: %x, 2: %x, 3: %x, 4: %x\n", buffer[0],buffer[1],buffer[2],buffer[3]);
                    //close previous jpg file
                    fclose(outptr);
                    printf("%s is closed\n",name);

                    //update variables
                    a++;

                    //create a numbered file
                    sprintf(name,"%03d.jpg",a);

                    //open new outfile
                    outptr = fopen(name,"w");

                    //write body chunk
                    fwrite(&buffer, 512, 1, outptr);
                }
                else
                {
                    //write body chunk
                    fwrite(&buffer, 512, 1, outptr);
                    //printf("%ith body write, 1: %x, 2: %x, 3: %x, 4: %x\n", q, buffer[0],buffer[1],buffer[2],buffer[3]);
                    q++;
                }
            }

        }

    }

    fclose(inptr);
    fclose(outptr);

}