#include <stdio.h>

#include <stdlib.h> #include <stdbool.h> #include <stdint.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 file %s\n", infile);
    return 2;
}

int buffer[512];

char* filename = NULL;

bool newfile = false;

bool writing = false;

FILE* img = fopen(filename, "w");

int i = 0;

//while not eof
while((fread(buffer, sizeof(1), 512, inptr)) == 512)
{
    //If it denotes the start of a JPEG
    if (buffer[0] == 0xff && buffer[1] == 0xd8 && buffer[2] == 0xff && (buffer[3] & 0xf0) == 0xe0)
    {
        newfile = true;

        //If already in a file
        if (writing == true)
        {
            fclose(img);
        }

        //Whether in file or not in file, if found start of new file

            //Make a new clean copy name
            sprintf(filename, "%03i.jpg", i);

            i++; //for when new files are created, they have different names

            //open copy for writing
            img = fopen(filename, "w");

            //write in copy
            fwrite(buffer, sizeof(1), 512, img);
    }

    //If not the start of a JPEG
    else
    {
        //If a new file was already opened
        if (newfile == true)
        {
            writing = true;

            fwrite(buffer, sizeof(1), 512, img);
        }

        //else just discard the data
    }
}

free(buffer);

free(filename);

fclose(inptr);

fclose(img);

return 0;

}

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

#include <stdbool.h>

#include <stdint.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 file %s\n", infile);
        return 2;
    }

    int buffer[512];

    char* filename = NULL;

    bool newfile = false;

    bool writing = false;

    FILE* img = fopen(filename, "w");

    int i = 0;

    //while not eof
    while((fread(buffer, sizeof(1), 512, inptr)) == 512)
    {
        //If it denotes the start of a JPEG
        if (buffer[0] == 0xff && buffer[1] == 0xd8 && buffer[2] == 0xff && (buffer[3] & 0xf0) == 0xe0)
        {
            newfile = true;

            //If already in a file
            if (writing == true)
            {
                fclose(img);
            }

            //Whether in file or not in file, if found start of new file

                //Make a new clean copy name
                sprintf(filename, "%03i.jpg", i);

                i++; //for when new files are created, they have different names

                //open copy for writing
                img = fopen(filename, "w");

                //write in copy
                fwrite(buffer, sizeof(1), 512, img);
        }

        //If not the start of a JPEG
        else
        {
            //If a new file was already opened
            if (newfile == true)
            {
                writing = true;

                fwrite(buffer, sizeof(1), 512, img);
            }

            //else just discard the data
        }
    }

    free(buffer);

    free(filename);

    fclose(inptr);

    fclose(img);

    return 0; 

}