#include <stdio.h>

#include <stdlib.h>

#include <fcntl.h>

#include <string.h>

#include <unistd.h>

#include <getopt.h>

#include <bits.h>

int main (int argc, char **argv)

{

    int fd;;

    int len;

    int i;

    char buffer[81];

    char key = 0xf3;

    int use_BINARY, use_NOT, use_HEX, use_XOR;

    use_XOR = use_HEX = use_BINARY = use_NOT = *buffer = 0;

    while ((i = getopt (argc, argv, "bhnk:x?")) >= 0) {

        switch (i) {

        case 'b':

            use_BINARY = 1;

            break;

        case 'h':

            use_HEX = 1;

            break;

        case 'k':

            key = atoi (optarg);

            break;

        case 'n':

            use_NOT = 1;

            break;

        case 'x':

            use_XOR = 1;

            break;

        case '?':

            printf ("Usage: %s [ -b|-h|-n|-x|-? ] [ file ]\n", argv[0]);

            printf ("b: binary\nh: hex\nn: not\nx: xor\n");

            printf ("If no filename is given, stdin is assumed\n");

            return 0;

        }

    }

    if (optind == argc)

        fd = fileno (stdin);

    else {

        if ((fd = open (argv[optind], O_RDONLY)) == -1) {

            perror ("OPEN");

            return EXIT_SUCCESS;

        }

    }

    while ((len = read (fd, buffer, 1)) > 0) {

        buffer[len] = 0;

        if (use_BINARY && use_XOR && use_NOT) {

            bindump (not (xor (buffer, key)), BITS);

        } else if (use_BINARY && use_XOR) {

            bindump (xor (buffer, key), BITS);

        } else if (use_BINARY && use_NOT) {

            bindump (not (buffer), BITS);

        } else if (use_BINARY) {

            bindump (buffer, BITS);

        } else if (use_HEX && use_XOR && use_NOT) {

            hexdump (not (xor (buffer, key)), len);

        } else if (use_HEX && use_XOR) {

            hexdump (xor (buffer, key), len);

        } else if (use_HEX && use_NOT) {

            hexdump (not (buffer), len);

        } else if (use_HEX) {

            hexdump (buffer, len);

        } else if (use_XOR && use_NOT) {

            printf ("%s", not (xor (buffer, key)));

        } else if (use_XOR) {

            printf ("%s", xor (buffer, key));

        } else if (use_NOT) {

            printf ("%s", not (buffer));

        } else

            printf ("%s", buffer);

    }

    close (fd);

    return 0;

}