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draw.c
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draw.c
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#include <ncurses.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "config.h"
#include "countdown.h"
#include "draw.h"
#include "state.h"
#include "utils.h"
#define WIDTH 100
#define HEIGHT 44
#define BASE_Y 2
static int size_y, size_x, page_y, page_x;
static void draw_line(int y);
static void draw_blank_line(int y);
static void draw_border(int time_left);
static void draw_info(int y, int x, struct state *st, struct config *conf)
{
time_t t = time(NULL);
struct tm tm = *localtime(&t);
mvprintw(y, x, "Welcome, %s %s", conf->fname, conf->lname);
mvprintw(y, x + WIDTH - 18, "%02d:%02d - %02d/%02d/%04d", tm.tm_hour, tm.tm_min, tm.tm_mday, tm.tm_mon + 1, tm.tm_year+ 1900);
draw_line(y + 1);
}
static void draw_page_content(int y, int x, struct state *st, struct config *conf)
{
int l, i, j, len = strlen(conf->pages[st->page]);
for (i = 0; i < HEIGHT - 22; ++i) {
draw_blank_line(y + i);
}
mvprintw(y, x, "File: %d/%d", st->page + 1, conf->num_pages);
if (!st->decrypted && st->page == conf->encrypted_page - 1) {
unsigned char plaintext[2048], ciphertext[2048];
strncpy((char *)plaintext, conf->pages[st->page], len);
int cipherlength = encrypt_AES_ECB(plaintext, ciphertext, len, conf->key);
mvprintw(y + 3, x, "THE FOLLOWING FILE IS ENCRYPTED");
for (i = 0, j = 0, l = 0; i < cipherlength; ++i, j += 3) {
if (j > WIDTH - 3) {
j = 0;
++l;
}
mvprintw(y + 5 + l, x + j, "%.2x ", ciphertext[i]);
}
return;
}
for (l = 0, i = 0; i < len; ++l) {
for (j = 0; j < WIDTH && i < len; ++i, ++j) {
if (conf->pages[st->page][i] == '\n') {
++i;
break;
}
mvaddch(y + 3 + l, x + j, conf->pages[st->page][i]);
}
}
}
static void draw_key(int y, int x, struct state *st)
{
int i;
mvprintw(y, x, "%02x", st->key[0]);
for (i = 1; i < 16; ++i) {
printw(" %02x", st->key[i]);
}
mvprintw(y + 1, x, "--");
for (i = 1; i < 16; ++i) {
printw("----");
}
mvprintw(y + 2, x, " 1");
for (i = 1; i < 16; ++i) {
printw(" %2d", i + 1);
}
}
static void draw_goal(int y, int x, struct state *st)
{
draw_line(y);
mvaddstr(y + 2, x, "The currently entered key is shown here. WARNING: An invalid");
mvaddstr(y + 3, x, "decryption speeds up the system delete sequence slightly!");
draw_key(y + 6, x, st);
draw_countdown(st->time_left, y + 3, x + WIDTH - COUNTDOWN_LENGTH);
}
static void draw_input(int y, int x, struct state *st)
{
draw_line(y);
mvaddstr(y + 2, x, "Please enter a command:");
mvaddstr(y + 4, x, ">");
mvaddstr(y + 6, x, " ");
mvaddstr(y + 6, x, st->message);
move(y + 4, x + 2);
}
void draw_page(struct state *st)
{
getmaxyx(stdscr, size_y, size_x);
page_y = BASE_Y;
page_x = (size_x - WIDTH) / 2;
draw_border(st->time_left);
draw_info(page_y, page_x, st, st->conf);
draw_page_content(page_y + 3, page_x, st, st->conf);
draw_goal(page_y + HEIGHT - 17, page_x, st);
// this must be last, in order for the input function to
// pick up the cursor position
draw_input(page_y + HEIGHT - 7, page_x, st);
}
static void draw_line(int y)
{
move(y, page_x);
int i;
for (i = 0; i < WIDTH; ++i) {
addch('=');
}
}
static void draw_blank_line(int y)
{
move(y, page_x);
int i;
for (i = 0; i < WIDTH; ++i) {
addch(' ');
}
}
static void draw_border(int time_left)
{
srand(0);
int width = (size_x - WIDTH - 10) / 2;
int remainder = (size_x - WIDTH - 10) % 2;
int i, j;
for (i = 0; i < size_y; ++i) {
if (i < page_y - 2 || i > page_y + HEIGHT + 1) {
move(i, 0);
for (j = 0; j < size_x; ++j) {
addch(rand() % 2 + 48);
}
} else {
move(i, 0);
for (j = 0; j < width; ++j) {
addch(rand() % 2 + 48);
}
move(i, width + WIDTH + 10);
for (j = 0; j < width + remainder; ++j) {
addch(rand() % 2 + 48);
}
}
}
}