RecoverHELP

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

int main(int argc, char *argv[]) // forensic card file taken as argv[1]
{
    if (argc != 2) // check for correct number of arguments
    {
        printf("Usage: file name"); // return usage error
        return 1; // end program, return fail
    }

    FILE *card; // forensic card file pointer
    card = fopen(argv[1], "r"); // open forensic card for reading

    if (!card)
    {
        fclose(card); // close invalid card file
        printf("ERROR: Could not open file");
        return 1; // end program, return fail
    }

    int fileCount = 0; // Counter for sequential file names
    char nextFile[8]; // Jpeg file name strings
    unsigned char buffer[512]; // read/write buffer
    FILE *newJpeg; // recovered jpeg file pointer
    char ch; // check for EOF

    while ((ch = fgetc(card)) != EOF) // For the full length of the forensic card file
    {
        fread(buffer, sizeof(unsigned char), 512, card); // read from card to buffer

        for (int i = 0; i  <= 512; i++) // DEBUGGING
            printf("%d : %p : %c\n", i, &buffer[i], buffer[i]); // DEBUGGING

        // If first jpeg header is detected
        if (fileCount == 0 && buffer[0] == 0xff && buffer[1] == 0xd8 && buffer[2] == 0xff && (buffer[3] & 0xf0) == 0xe0)
        {
            sprintf(nextFile, "img_%03d.jpg", fileCount); // set first file name
            newJpeg = fopen(nextFile, "w"); // open first jpeg file
            fileCount++; // increase file count for next file name
            fwrite(buffer, sizeof(unsigned char), 512, newJpeg); // write from buffer to jpeg file
            continue;
        }

        // If next jpeg header is detected
        if (buffer[0] == 0xff && buffer[1] == 0xd8 && buffer[2] == 0xff && (buffer[3] & 0xf0) == 0xe0)
        {
            fclose(newJpeg); // close last jpeg file
            sprintf(nextFile, "img_%03d.jpg", fileCount); // set current file name
            newJpeg = fopen(nextFile, "w"); // open current jpeg file
            fileCount++; // increase file count for next file name
            fwrite(buffer, sizeof(unsigned char), 512, newJpeg); // write from buffer to jpeg file
            continue;
        }

        fwrite(buffer, sizeof(unsigned char), 512, newJpeg); // write from buffer to jpeg file
    }

    fclose(newJpeg); // close final jpeg file
    fclose(card); // close forensic card file

    return 0; // end program, return success
}