376 lines
11 KiB
C
376 lines
11 KiB
C
// Copyright (c) 2016 Brian Barto
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//
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// This program is free software; you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 3 of the License, or (at your option)
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// any later version. See COPYING for more details.
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#include "nms.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <stdbool.h>
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#include <time.h>
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#include <locale.h>
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#include <ncurses.h>
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#define TYPE_EFFECT_SPEED 4 // miliseconds per char
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#define JUMBLE_SECONDS 2 // number of seconds for jumble effect
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#define JUMBLE_LOOP_SPEED 35 // miliseconds between each jumble
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#define REVEAL_LOOP_SPEED 100 // miliseconds (must be evenly divisible by 5)
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#define SPACE 32
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#define NEWLINE 10
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#define TAB 9
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#define TAB_SIZE 4
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// Window position structure, linked list. Keeps track of every
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// character's position on the terminal, as well as other attributes.
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struct winpos {
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char source;
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char *mask;
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int row;
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int col;
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int s1_time;
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int s2_time;
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struct winpos *next;
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};
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// Function prototypes (internal)
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char *getMaskChar(void);
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int getColorByName(char *);
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/*
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* void nms_exec(NmsArgs *)
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*
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* DESCR:
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* Performs "decryption" effect, Returns the character pressed at the last pause, or
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* '\0' (null character) if there are any problems.
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*
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* ARGS:
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* NmsArgs *args - Pointer to argument structure
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*
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* STRUCTURE MEMBERS:
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* args.src - Pointer to string on which to perform the effect
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* args.return_opts - Pointer to string containing character options for menu
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* args.input_cursor_x - X screen coordinate to place cursor after "decryption"
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* args.input_cursor_y - Y screen coordinate to place cursor after "decryption"
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* args.show_cursor - 'true' to display cursor, 'false' to hide cursor.
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*
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*/
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char nms_exec(NmsArgs *args) {
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struct winpos *list_pointer = NULL;
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struct winpos *start; // Always points to start of list
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struct winpos *temp; // Used for free()ing the list
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int termSizeRows, termSizeCols;
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int c, n, x = 0, y = 0;
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int r_time, r_time_l, r_time_s;
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bool first = true;
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char ret = 0;
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// Lets check args.src and make sure we have text. If not, return
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// with an error message.
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if (args->src == NULL) {
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fprintf(stderr, "Error. No data found in args.src\n");
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return 0;
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}
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// Seems to be needed for utf-8 support
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setlocale(LC_ALL, "");
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// Start and initialize curses mode
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initscr();
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cbreak();
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noecho();
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scrollok(stdscr, true);
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if (args->show_cursor == false)
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curs_set(0);
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// Setting up and starting colors if terminal supports them
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if (has_colors()) {
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start_color();
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init_pair(1, getColorByName(args->foreground_color), COLOR_BLACK);
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}
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// Get terminal window size
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getmaxyx(stdscr, termSizeRows, termSizeCols);
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// Seed my random number generator with the current time
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srand(time(NULL));
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// Geting input
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n = 0;
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while ((c = args->src[n++]) != '\0') {
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if (c == NEWLINE) {
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++y;
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x = 0;
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} else if (c == TAB && x + TAB_SIZE <= termSizeCols) {
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x += TAB_SIZE;
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} else if (isspace(c)) {
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if (++x > termSizeCols) {
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++y;
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x = 0;
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}
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} else {
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if (first) {
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list_pointer = malloc(sizeof(struct winpos));
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start = list_pointer;
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first = false;
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} else {
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list_pointer->next = malloc(sizeof(struct winpos));
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list_pointer = list_pointer->next;
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}
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r_time = rand() % 50;
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r_time_s = r_time * .25;
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r_time_l = r_time * .75;
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r_time *= 100;
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r_time_s *= 100;
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r_time_l *= 100;
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list_pointer->source = c;
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list_pointer->mask = getMaskChar();
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list_pointer->row = y;
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list_pointer->col = x;
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list_pointer->s1_time = r_time > 1000 ? r_time_l : r_time;
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list_pointer->s2_time = r_time > 1000 ? r_time_s : 0;
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list_pointer->next = NULL;
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if (++x > termSizeCols) {
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++y;
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x = 0;
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}
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}
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}
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// Initially display the characters in the terminal with a 'type effect'.
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list_pointer = start;
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while (list_pointer != NULL && list_pointer->row <= termSizeRows) {
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mvaddstr(list_pointer->row, list_pointer->col, list_pointer->mask);
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refresh();
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list_pointer->mask = getMaskChar();
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list_pointer = list_pointer->next;
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usleep(TYPE_EFFECT_SPEED * 1000);
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}
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// Flush any input up to this point
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flushinp();
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// If auto_decrypt flag is set, we sleep. Otherwise, reopen stdin for interactive
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// input (keyboard), then require user to press a key to continue.
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if (args->auto_decrypt == true || (!isatty(STDIN_FILENO) && !freopen ("/dev/tty", "r", stdin)))
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sleep(1);
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else
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getch();
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// Jumble loop
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x = 0;
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while (x < (JUMBLE_SECONDS * 1000) / JUMBLE_LOOP_SPEED) {
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list_pointer = start;
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while (list_pointer != NULL && list_pointer->row <= termSizeRows) {
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mvaddstr(list_pointer->row, list_pointer->col, list_pointer->mask);
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list_pointer->mask = getMaskChar();
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list_pointer = list_pointer->next;
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}
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refresh();
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usleep(JUMBLE_LOOP_SPEED * 1000);
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++x;
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}
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// Reveal loop
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int s1_remask_time = 500; // time, in milliseconds, we change the mask for stage 1
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bool loop = true;
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while (loop) {
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loop = false;
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list_pointer = start;
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while (list_pointer != NULL && list_pointer->row <= termSizeRows) {
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if (list_pointer->s1_time > 0) {
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loop = true;
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list_pointer->s1_time -= REVEAL_LOOP_SPEED;
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if (list_pointer->s1_time % s1_remask_time == 0) {
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list_pointer->mask = getMaskChar();
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}
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} else if (list_pointer->s2_time > 0) {
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loop = true;
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list_pointer->s2_time -= REVEAL_LOOP_SPEED;
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list_pointer->mask = getMaskChar();
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} else {
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list_pointer->mask = NULL;
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list_pointer->mask = malloc(sizeof(list_pointer->source) + 1);
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sprintf(list_pointer->mask, "%c", list_pointer->source);
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attron(A_BOLD);
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if (has_colors())
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attron(COLOR_PAIR(1));
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}
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mvaddstr(list_pointer->row, list_pointer->col, list_pointer->mask);
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refresh();
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list_pointer = list_pointer->next;
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attroff(A_BOLD);
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if (has_colors())
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attroff(COLOR_PAIR(1));
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}
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usleep(REVEAL_LOOP_SPEED * 1000);
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}
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// Printing remaining characters from list if we stopped short due to
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// a terminal row limitation. i.e. the number of textual rows in the input
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// stream were greater than the number of rows in the terminal.
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int prevRow;
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if (list_pointer != NULL) {
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attron(A_BOLD);
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if (has_colors())
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attron(COLOR_PAIR(1));
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prevRow = list_pointer->row;
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scroll(stdscr);
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while (list_pointer != NULL) {
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while (list_pointer->row > prevRow) {
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scroll(stdscr);
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++prevRow;
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}
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mvaddch(termSizeRows -1, list_pointer->col, list_pointer->source);
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refresh();
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//mvaddch(0, 0, list_pointer->source);
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list_pointer = list_pointer->next;
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}
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attroff(A_BOLD);
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if (has_colors())
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attroff(COLOR_PAIR(1));
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}
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// Flush any input up to this point
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flushinp();
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// Position cursor
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if (args->input_cursor_y >= 0 && args->input_cursor_x >= 0) {
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move(args->input_cursor_y, args->input_cursor_x);
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curs_set(1);
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}
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// If stdin is set to the keyboard, user must press a key to continue
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if (isatty(STDIN_FILENO)) {
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ret = getch();
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if (args->return_opts != NULL && strlen(args->return_opts) > 0)
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while (index(args->return_opts, ret) == NULL) {
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beep();
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ret = getch();
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}
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} else
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sleep(2);
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// End curses mode
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endwin();
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// Freeing the list.
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list_pointer = start;
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while (list_pointer != NULL) {
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temp = list_pointer;
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list_pointer = list_pointer->next;
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free(temp->mask);
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free(temp);
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}
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return ret;
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}
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/*
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* char *getMaskChar(void)
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*
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* DESCR:
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* Returns a random character from the maskChars string.
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*
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*/
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char *getMaskChar(void) {
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char *maskChars[] = {
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"!", "\"", "#", "$", "%", "&", "'", "(", ")", "*", "+", ",", "-", "~",
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".", "/", ":", ";", "<", "=", ">", "?", "[", "\\", "]", "_", "{", "}",
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"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
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"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z",
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"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m",
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"n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z",
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"0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
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"\xc3\x87", "\xc3\xbc", "\xc3\xa9", "\xc3\xa2", "\xc3\xa4", "\xc3\xa0",
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"\xc3\xa5", "\xc3\xa7", "\xc3\xaa", "\xc3\xab", "\xc3\xa8", "\xc3\xaf",
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"\xc3\xae", "\xc3\xac", "\xc3\x84", "\xc3\x85", "\xc3\x89", "\xc3\xa6",
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"\xc3\x86", "\xc3\xb4", "\xc3\xb6", "\xc3\xb2", "\xc3\xbb", "\xc3\xb9",
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"\xc3\xbf", "\xc3\x96", "\xc3\x9c", "\xc2\xa2", "\xc2\xa3", "\xc2\xa5",
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"\xc6\x92", "\xc3\xa1", "\xc3\xad", "\xc3\xb3", "\xc3\xba", "\xc3\xb1",
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"\xc3\x91", "\xc2\xaa", "\xc2\xba", "\xc2\xbf", "\xc2\xac", "\xc2\xbd",
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"\xc2\xbc", "\xc2\xa1", "\xc2\xab", "\xc2\xbb", "\xce\xb1", "\xc3\x9f",
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"\xce\x93", "\xcf\x80", "\xce\xa3", "\xcf\x83", "\xc2\xb5", "\xcf\x84",
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"\xce\xa6", "\xce\x98", "\xce\xa9", "\xce\xb4", "\xcf\x86", "\xce\xb5",
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"\xc2\xb1", "\xc3\xb7", "\xc2\xb0", "\xc2\xb7", "\xc2\xb2", "\xc2\xb6",
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"\xe2\x8c\x90", "\xe2\x82\xa7", "\xe2\x96\x91", "\xe2\x96\x92",
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"\xe2\x96\x93", "\xe2\x94\x82", "\xe2\x94\xa4", "\xe2\x95\xa1",
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"\xe2\x95\xa2", "\xe2\x95\x96", "\xe2\x95\x95", "\xe2\x95\xa3",
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"\xe2\x95\x91", "\xe2\x95\x97", "\xe2\x95\x9d", "\xe2\x95\x9c",
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"\xe2\x95\x9b", "\xe2\x94\x90", "\xe2\x94\x94", "\xe2\x94\xb4",
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"\xe2\x94\xac", "\xe2\x94\x9c", "\xe2\x94\x80", "\xe2\x94\xbc",
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"\xe2\x95\x9e", "\xe2\x95\x9f", "\xe2\x95\x9a", "\xe2\x95\x94",
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"\xe2\x95\xa9", "\xe2\x95\xa6", "\xe2\x95\xa0", "\xe2\x95\x90",
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"\xe2\x95\xac", "\xe2\x95\xa7", "\xe2\x95\xa8", "\xe2\x95\xa4",
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"\xe2\x95\xa7", "\xe2\x95\x99", "\xe2\x95\x98", "\xe2\x95\x92",
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"\xe2\x95\x93", "\xe2\x95\xab", "\xe2\x95\xaa", "\xe2\x94\x98",
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"\xe2\x94\x8c", "\xe2\x96\x88", "\xe2\x96\x84", "\xe2\x96\x8c",
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"\xe2\x96\x90", "\xe2\x96\x80", "\xe2\x88\x9e", "\xe2\x88\xa9",
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"\xe2\x89\xa1", "\xe2\x89\xa5", "\xe2\x89\xa4", "\xe2\x8c\xa0",
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"\xe2\x8c\xa1", "\xe2\x89\x88", "\xe2\x88\x99", "\xe2\x88\x9a",
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"\xe2\x81\xbf", "\xe2\x96\xa0"
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};
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return maskChars[rand() % 218];
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}
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/*
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* char getColorByName(char *string, int fallback)
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*
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* ARGS:
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*
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* char *string - new color setting (white, yellow, black, magenta, blue, green, red)
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*
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* DESCR:
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* Returns an ncurses color by its name.
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*
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*/
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int getColorByName(char *string) {
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if(string == NULL) {
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return COLOR_BLUE;
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}
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if(strcmp("white", string) == 0) {
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return COLOR_WHITE;
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}
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if(strcmp("yellow", string) == 0) {
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return COLOR_YELLOW;
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}
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if(strcmp("black", string) == 0) {
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return COLOR_BLACK;
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}
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if(strcmp("magenta", string) == 0) {
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return COLOR_MAGENTA;
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}
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if(strcmp("blue", string) == 0) {
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return COLOR_BLUE;
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}
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if(strcmp("green", string) == 0) {
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return COLOR_GREEN;
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}
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if(strcmp("red", string) == 0) {
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return COLOR_RED;
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}
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return COLOR_BLUE;
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}
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