/**
 * recover.c
 *
 * Computer Science 50
 * Problem Set 4
 *
 * Recovers JPEGs from a forensic image.
 */
 #include <cs50.h>
 #include <stdio.h>
 #include <string.h>

int main(int argc, char* argv[])
{
    // TODO

   // Open file
     FILE* inptr = fopen("card.raw", "r");

    // Check if the file exists and can be opened
    if (inptr == NULL)
    {
        printf("Could not open 'card.raw'.\n");
        return 1;
    }

    // Declare the buffer where the block of 512 bytes will be stored
    unsigned char buffer[512];

    // Declare and intialize counter for file
    int fcount = 0;

    // Initialize a variable for file name
    char fname[8];

    // Declare file name temporary variable
    FILE* temp = NULL;



     while (fread(&buffer, sizeof(buffer), 1, inptr)!= 0)  // fread to check end of file
    {
        fread(&buffer, sizeof(buffer), 1, inptr);

         while (fread(&buffer, sizeof(buffer), 1, inptr))    // read 512 bytes into buffer
        {


            if ( buffer[0] == 0xff &&
                 buffer[1] == 0xd8 &&
                 buffer[2] == 0xff &&
                (buffer[3] >= 0xe0 || buffer[3] <= 0xef) ) /*block starts with jpeg header*/ //

            {



                 // generate file name
                 sprintf( fname, "%03d.jpg",fcount );
                   fcount++;  // increment file number

                    if (temp != NULL)
                    {
                        fclose(temp); // close file
                     }

                // file = Open a new JPEG file
                temp = fopen(fname, "w");


            }
            if (fcount != 0)
            {
               fwrite(buffer, sizeof(buffer), 1, temp); // now write that block to file , I assume it will keep writing till next jpg

            }



            if  (temp != NULL)
                    {
                    fwrite(buffer, sizeof(buffer), 1, temp);
                    }


        }



    } // 1st while loop

    if (inptr != 0)   /*card file is open*/
        {
            fclose(inptr); // Close it
        }


}