no-more-secrets-rust/src/nms.c

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// Copyright (c) 2016 Brian Barto
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3 of the License, or (at your option)
// any later version. See COPYING for more details.
#include "nms.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <ctype.h>
#include <stdbool.h>
#include <time.h>
#include <locale.h>
#include <wchar.h>
#include <ncurses.h>
#define TYPE_EFFECT_SPEED 4 // miliseconds per char
#define JUMBLE_SECONDS 2 // number of seconds for jumble effect
#define JUMBLE_LOOP_SPEED 35 // miliseconds between each jumble
#define REVEAL_LOOP_SPEED 100 // miliseconds (must be evenly divisible by 5)
#define SPACE 32
#define NEWLINE 10
#define TAB 9
#define TAB_SIZE 4
// Window position structure, linked list. Keeps track of every
// character's position on the terminal, as well as other attributes.
struct winpos {
char *source;
char *mask;
int row;
int col;
int s1_time;
int s2_time;
struct winpos *next;
};
// Interval structure needed for the mk_wcwidth() function which is
// used to determine character width
struct interval {
int first;
int last;
};
// Function prototypes (internal)
char *getMaskChar(void);
int getColorByName(char *);
int mk_wcwidth(wchar_t);
/*
* void nms_exec(NmsArgs *)
*
* DESCR:
* Performs "decryption" effect, Returns the character pressed at the last pause, or
* '\0' (null character) if there are any problems.
*
* ARGS:
* NmsArgs *args - Pointer to argument structure
*
* STRUCTURE MEMBERS:
* args.src - Pointer to string on which to perform the effect
* args.return_opts - Pointer to string containing character options for menu
* args.input_cursor_x - X screen coordinate to place cursor after "decryption"
* args.input_cursor_y - Y screen coordinate to place cursor after "decryption"
* args.show_cursor - 'true' to display cursor, 'false' to hide cursor.
*
*/
char nms_exec(NmsArgs *args) {
struct winpos *list_pointer = NULL;
struct winpos *start; // Always points to start of list
struct winpos *temp; // Used for free()ing the list
int termSizeRows, termSizeCols;
int c, n, x = 0, y = 0;
int r_time, r_time_l, r_time_s;
bool first = true;
char ret = 0;
// Lets check args.src and make sure we have text. If not, return
// with an error message.
if (args->src == NULL) {
fprintf(stderr, "Error. No data found in args.src\n");
return 0;
}
// Seems to be needed for utf-8 support
setlocale(LC_ALL, "");
// Start and initialize curses mode
initscr();
cbreak();
noecho();
scrollok(stdscr, true);
if (args->show_cursor == false)
curs_set(0);
// Setting up and starting colors if terminal supports them
if (has_colors()) {
start_color();
init_pair(1, getColorByName(args->foreground_color), COLOR_BLACK);
}
// Get terminal window size
getmaxyx(stdscr, termSizeRows, termSizeCols);
// Seed my random number generator with the current time
srand(time(NULL));
// Geting input
n = 0;
while ((c = args->src[n++]) != '\0') {
if (c == NEWLINE) {
++y;
x = 0;
} else if (c == TAB) {
if (x + TAB_SIZE < termSizeCols)
x += TAB_SIZE;
else {
++y;
x = 0;
}
} else if (isspace(c)) {
if (++x >= termSizeCols) {
++y;
x = 0;
}
} else {
if (first) {
list_pointer = malloc(sizeof(struct winpos));
start = list_pointer;
first = false;
} else {
list_pointer->next = malloc(sizeof(struct winpos));
list_pointer = list_pointer->next;
}
r_time = rand() % 50;
r_time_s = r_time * .25;
r_time_l = r_time * .75;
r_time *= 100;
r_time_s *= 100;
r_time_l *= 100;
if ((c & 0x80) == 0x00) {
// ascii char
list_pointer->source = malloc(2);
list_pointer->source[0] = c;
list_pointer->source[1] = '\0';
} else if ((c & 0xE0) == 0xC0) {
// 2 byte char
list_pointer->source = malloc(3);
list_pointer->source[0] = c;
list_pointer->source[1] = args->src[n++];
list_pointer->source[2] = '\0';
} else if ((c & 0xF0) == 0xE0) {
// 3 byte char
list_pointer->source = malloc(4);
list_pointer->source[0] = c;
list_pointer->source[1] = args->src[n++];
list_pointer->source[2] = args->src[n++];
list_pointer->source[3] = '\0';
} else if ((c & 0xF8) == 0xF0) {
// 4 byte char
list_pointer->source = malloc(5);
list_pointer->source[0] = c;
list_pointer->source[1] = args->src[n++];
list_pointer->source[2] = args->src[n++];
list_pointer->source[3] = args->src[n++];
list_pointer->source[4] = '\0';
} else {
// Unrecognized char, treat it as a single-byte char
list_pointer->source = malloc(2);
list_pointer->source[0] = c;
list_pointer->source[1] = '\0';
}
list_pointer->mask = getMaskChar();
list_pointer->row = y;
list_pointer->col = x;
list_pointer->s1_time = r_time > 1000 ? r_time_l : r_time;
list_pointer->s2_time = r_time > 1000 ? r_time_s : 0;
list_pointer->next = NULL;
wchar_t widec[sizeof(list_pointer->source)] = {};
mbstowcs(widec, list_pointer->source, sizeof(list_pointer->source));
if (mk_wcwidth(*widec) == 2)
++x;
if (++x >= termSizeCols) {
++y;
x = 0;
}
}
}
// Initially display the characters in the terminal with a 'type effect'.
list_pointer = start;
while (list_pointer != NULL && list_pointer->row <= termSizeRows) {
mvaddstr(list_pointer->row, list_pointer->col, list_pointer->mask);
refresh();
list_pointer->mask = getMaskChar();
list_pointer = list_pointer->next;
usleep(TYPE_EFFECT_SPEED * 1000);
}
// Flush any input up to this point
flushinp();
// If auto_decrypt flag is set, we sleep. Otherwise, reopen stdin for interactive
// input (keyboard), then require user to press a key to continue.
if (args->auto_decrypt == true || (!isatty(STDIN_FILENO) && !freopen ("/dev/tty", "r", stdin)))
sleep(1);
else
getch();
// Jumble loop
x = 0;
while (x < (JUMBLE_SECONDS * 1000) / JUMBLE_LOOP_SPEED) {
list_pointer = start;
while (list_pointer != NULL && list_pointer->row <= termSizeRows) {
mvaddstr(list_pointer->row, list_pointer->col, list_pointer->mask);
list_pointer->mask = getMaskChar();
list_pointer = list_pointer->next;
}
refresh();
usleep(JUMBLE_LOOP_SPEED * 1000);
++x;
}
// Reveal loop
int s1_remask_time = 500; // time, in milliseconds, we change the mask for stage 1
bool loop = true;
while (loop) {
loop = false;
list_pointer = start;
while (list_pointer != NULL && list_pointer->row <= termSizeRows) {
if (list_pointer->s1_time > 0) {
loop = true;
list_pointer->s1_time -= REVEAL_LOOP_SPEED;
if (list_pointer->s1_time % s1_remask_time == 0) {
list_pointer->mask = getMaskChar();
}
} else if (list_pointer->s2_time > 0) {
loop = true;
list_pointer->s2_time -= REVEAL_LOOP_SPEED;
list_pointer->mask = getMaskChar();
} else {
list_pointer->mask = list_pointer->source;
attron(A_BOLD);
if (has_colors())
attron(COLOR_PAIR(1));
}
mvaddstr(list_pointer->row, list_pointer->col, list_pointer->mask);
refresh();
list_pointer = list_pointer->next;
attroff(A_BOLD);
if (has_colors())
attroff(COLOR_PAIR(1));
}
usleep(REVEAL_LOOP_SPEED * 1000);
}
// Printing remaining characters from list if we stopped short due to
// a terminal row limitation. i.e. the number of textual rows in the input
// stream were greater than the number of rows in the terminal.
int prevRow;
if (list_pointer != NULL) {
attron(A_BOLD);
if (has_colors())
attron(COLOR_PAIR(1));
prevRow = list_pointer->row - 1;
scroll(stdscr);
while (list_pointer != NULL) {
while (list_pointer->row > prevRow) {
scroll(stdscr);
++prevRow;
}
mvaddstr(termSizeRows -1, list_pointer->col, list_pointer->source);
refresh();
list_pointer = list_pointer->next;
}
attroff(A_BOLD);
if (has_colors())
attroff(COLOR_PAIR(1));
}
// Flush any input up to this point
flushinp();
// Position cursor
if (args->input_cursor_y >= 0 && args->input_cursor_x >= 0) {
move(args->input_cursor_y, args->input_cursor_x);
curs_set(1);
}
// If stdin is set to the keyboard, user must press a key to continue
if (isatty(STDIN_FILENO)) {
ret = getch();
if (args->return_opts != NULL && strlen(args->return_opts) > 0)
while (index(args->return_opts, ret) == NULL) {
beep();
ret = getch();
}
} else
sleep(2);
// End curses mode
endwin();
// Freeing the list.
list_pointer = start;
while (list_pointer != NULL) {
temp = list_pointer;
list_pointer = list_pointer->next;
free(temp->source);
free(temp);
}
return ret;
}
/*
* char *getMaskChar(void)
*
* DESCR:
* Returns a random character from the maskChars string.
*
*/
char *getMaskChar(void) {
char *maskChars[] = {
"!", "\"", "#", "$", "%", "&", "'", "(", ")", "*", "+", ",", "-", "~",
".", "/", ":", ";", "<", "=", ">", "?", "[", "\\", "]", "_", "{", "}",
"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z",
"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m",
"n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z",
"0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
"\xc3\x87", "\xc3\xbc", "\xc3\xa9", "\xc3\xa2", "\xc3\xa4", "\xc3\xa0",
"\xc3\xa5", "\xc3\xa7", "\xc3\xaa", "\xc3\xab", "\xc3\xa8", "\xc3\xaf",
"\xc3\xae", "\xc3\xac", "\xc3\x84", "\xc3\x85", "\xc3\x89", "\xc3\xa6",
"\xc3\x86", "\xc3\xb4", "\xc3\xb6", "\xc3\xb2", "\xc3\xbb", "\xc3\xb9",
"\xc3\xbf", "\xc3\x96", "\xc3\x9c", "\xc2\xa2", "\xc2\xa3", "\xc2\xa5",
"\xc6\x92", "\xc3\xa1", "\xc3\xad", "\xc3\xb3", "\xc3\xba", "\xc3\xb1",
"\xc3\x91", "\xc2\xaa", "\xc2\xba", "\xc2\xbf", "\xc2\xac", "\xc2\xbd",
"\xc2\xbc", "\xc2\xa1", "\xc2\xab", "\xc2\xbb", "\xce\xb1", "\xc3\x9f",
"\xce\x93", "\xcf\x80", "\xce\xa3", "\xcf\x83", "\xc2\xb5", "\xcf\x84",
"\xce\xa6", "\xce\x98", "\xce\xa9", "\xce\xb4", "\xcf\x86", "\xce\xb5",
"\xc2\xb1", "\xc3\xb7", "\xc2\xb0", "\xc2\xb7", "\xc2\xb2", "\xc2\xb6",
"\xe2\x8c\x90", "\xe2\x82\xa7", "\xe2\x96\x91", "\xe2\x96\x92",
"\xe2\x96\x93", "\xe2\x94\x82", "\xe2\x94\xa4", "\xe2\x95\xa1",
"\xe2\x95\xa2", "\xe2\x95\x96", "\xe2\x95\x95", "\xe2\x95\xa3",
"\xe2\x95\x91", "\xe2\x95\x97", "\xe2\x95\x9d", "\xe2\x95\x9c",
"\xe2\x95\x9b", "\xe2\x94\x90", "\xe2\x94\x94", "\xe2\x94\xb4",
"\xe2\x94\xac", "\xe2\x94\x9c", "\xe2\x94\x80", "\xe2\x94\xbc",
"\xe2\x95\x9e", "\xe2\x95\x9f", "\xe2\x95\x9a", "\xe2\x95\x94",
"\xe2\x95\xa9", "\xe2\x95\xa6", "\xe2\x95\xa0", "\xe2\x95\x90",
"\xe2\x95\xac", "\xe2\x95\xa7", "\xe2\x95\xa8", "\xe2\x95\xa4",
"\xe2\x95\xa7", "\xe2\x95\x99", "\xe2\x95\x98", "\xe2\x95\x92",
"\xe2\x95\x93", "\xe2\x95\xab", "\xe2\x95\xaa", "\xe2\x94\x98",
"\xe2\x94\x8c", "\xe2\x96\x88", "\xe2\x96\x84", "\xe2\x96\x8c",
"\xe2\x96\x90", "\xe2\x96\x80", "\xe2\x88\x9e", "\xe2\x88\xa9",
"\xe2\x89\xa1", "\xe2\x89\xa5", "\xe2\x89\xa4", "\xe2\x8c\xa0",
"\xe2\x8c\xa1", "\xe2\x89\x88", "\xe2\x88\x99", "\xe2\x88\x9a",
"\xe2\x81\xbf", "\xe2\x96\xa0"
};
return maskChars[rand() % 218];
}
/*
* char getColorByName(char *string, int fallback)
*
* ARGS:
*
* char *string - new color setting (white, yellow, black, magenta, blue, green, red)
*
* DESCR:
* Returns an ncurses color by its name.
*
*/
int getColorByName(char *string) {
if(string == NULL) {
return COLOR_BLUE;
}
if(strcmp("white", string) == 0) {
return COLOR_WHITE;
}
if(strcmp("yellow", string) == 0) {
return COLOR_YELLOW;
}
if(strcmp("black", string) == 0) {
return COLOR_BLACK;
}
if(strcmp("magenta", string) == 0) {
return COLOR_MAGENTA;
}
if(strcmp("blue", string) == 0) {
return COLOR_BLUE;
}
if(strcmp("green", string) == 0) {
return COLOR_GREEN;
}
if(strcmp("red", string) == 0) {
return COLOR_RED;
}
return COLOR_BLUE;
}
/*
* static int bisearch(wchar_t ucs, const struct interval *table, int max)
*
* DESCR:
* auxiliary function for binary search in interval table
*
* Copied from: https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
*/
static int bisearch(wchar_t ucs, const struct interval *table, int max) {
int min = 0;
int mid;
if (ucs < table[0].first || ucs > table[max].last)
return 0;
while (max >= min) {
mid = (min + max) / 2;
if (ucs > table[mid].last)
min = mid + 1;
else if (ucs < table[mid].first)
max = mid - 1;
else
return 1;
}
return 0;
}
/* The following function defines the column width of an ISO 10646
* character as follows:
*
* - The null character (U+0000) has a column width of 0.
*
* - Other C0/C1 control characters and DEL will lead to a return
* value of -1.
*
* - Non-spacing and enclosing combining characters (general
* category code Mn or Me in the Unicode database) have a
* column width of 0.
*
* - Other format characters (general category code Cf in the Unicode
* database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
*
* - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
* have a column width of 0.
*
* - Spacing characters in the East Asian Wide (W) or East Asian
* Full-width (F) category as defined in Unicode Technical
* Report #11 have a column width of 2.
*
* - All remaining characters (including all printable
* ISO 8859-1 and WGL4 characters, Unicode control characters,
* etc.) have a column width of 1.
*
* This implementation assumes that wchar_t characters are encoded
* in ISO 10646.
*/
int mk_wcwidth(wchar_t ucs) {
/* sorted list of non-overlapping intervals of non-spacing characters */
/* generated with "uniset +cat=Me +cat=Mn +cat=Cf +1160-11FF +200B c" */
static const struct interval combining[] = {
{ 0x0300, 0x034F }, { 0x0360, 0x036F }, { 0x0483, 0x0486 },
{ 0x0488, 0x0489 }, { 0x0591, 0x05A1 }, { 0x05A3, 0x05B9 },
{ 0x05BB, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
{ 0x05C4, 0x05C4 }, { 0x064B, 0x0655 }, { 0x0670, 0x0670 },
{ 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
{ 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
{ 0x07A6, 0x07B0 }, { 0x0901, 0x0902 }, { 0x093C, 0x093C },
{ 0x0941, 0x0948 }, { 0x094D, 0x094D }, { 0x0951, 0x0954 },
{ 0x0962, 0x0963 }, { 0x0981, 0x0981 }, { 0x09BC, 0x09BC },
{ 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD }, { 0x09E2, 0x09E3 },
{ 0x0A02, 0x0A02 }, { 0x0A3C, 0x0A3C }, { 0x0A41, 0x0A42 },
{ 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D }, { 0x0A70, 0x0A71 },
{ 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC }, { 0x0AC1, 0x0AC5 },
{ 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD }, { 0x0B01, 0x0B01 },
{ 0x0B3C, 0x0B3C }, { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 },
{ 0x0B4D, 0x0B4D }, { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 },
{ 0x0BC0, 0x0BC0 }, { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 },
{ 0x0C46, 0x0C48 }, { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 },
{ 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
{ 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D }, { 0x0DCA, 0x0DCA },
{ 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 }, { 0x0E31, 0x0E31 },
{ 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E }, { 0x0EB1, 0x0EB1 },
{ 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC }, { 0x0EC8, 0x0ECD },
{ 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 }, { 0x0F37, 0x0F37 },
{ 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E }, { 0x0F80, 0x0F84 },
{ 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 }, { 0x0F99, 0x0FBC },
{ 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 }, { 0x1032, 0x1032 },
{ 0x1036, 0x1037 }, { 0x1039, 0x1039 }, { 0x1058, 0x1059 },
{ 0x1160, 0x11FF }, { 0x1712, 0x1714 }, { 0x1732, 0x1734 },
{ 0x1752, 0x1753 }, { 0x1772, 0x1773 }, { 0x17B7, 0x17BD },
{ 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x180B, 0x180E },
{ 0x18A9, 0x18A9 }, { 0x200B, 0x200F }, { 0x202A, 0x202E },
{ 0x2060, 0x2063 }, { 0x206A, 0x206F }, { 0x20D0, 0x20EA },
{ 0x302A, 0x302F }, { 0x3099, 0x309A }, { 0xFB1E, 0xFB1E },
{ 0xFE00, 0xFE0F }, { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF },
{ 0xFFF9, 0xFFFB }, { 0x1D167, 0x1D169 }, { 0x1D173, 0x1D182 },
{ 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD }, { 0xE0001, 0xE0001 },
{ 0xE0020, 0xE007F }
};
/* test for 8-bit control characters */
if (ucs == 0)
return 0;
if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
return -1;
/* binary search in table of non-spacing characters */
if (bisearch(ucs, combining, sizeof(combining) / sizeof(struct interval) - 1))
return 0;
/* if we arrive here, ucs is not a combining or C0/C1 control character */
return 1 +
(ucs >= 0x1100 &&
(ucs <= 0x115f || /* Hangul Jamo init. consonants */
ucs == 0x2329 || ucs == 0x232a ||
(ucs >= 0x2e80 && ucs <= 0xa4cf &&
ucs != 0x303f) || /* CJK ... Yi */
(ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
(ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
(ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
(ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */
(ucs >= 0xffe0 && ucs <= 0xffe6) ||
(ucs >= 0x20000 && ucs <= 0x2ffff)));
}