first commit
This commit is contained in:
David Ali
21
LICENSE
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21
LICENSE
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MIT License
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Copyright (c) 2026 Dávid Ali
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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49
README.md
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49
README.md
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# chexed
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A simple terminal-based hex editor. It is written in C and uses the ncurses library.
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## Prerequisites
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You need a Linux system and the ncurses library.
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Install it on Debian/Ubuntu with this command:
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```bash
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sudo apt install libncurses-dev
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```
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## Compilation
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Use `gcc` to compile the source code. Run this command:
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```bash
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gcc chexed.c -o chexed -lncurses
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```
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## Usage
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Run the program with a file path:
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```bash
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./chexed your_file.bin
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```
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### Controls
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* **Arrow Keys**: navigate through the file.
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* **Page Up / Page Down**: scroll quickly.
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* **0-9, A-F**: input hex values.
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* **+ / -**: increment or decrement the byte value by 1.
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* **Ctrl+S**: save changes to the file.
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* **Ctrl+Q**: quit the program.
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## Known Limitations
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The program loads the entire file into RAM. Do not open files larger than your available memory.
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The file size is fixed: you cannot insert or delete bytes.
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Editing works in a specific way: typing a new digit shifts the current value 4 bits to the left.
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## License
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MIT
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217
chexed.c
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217
chexed.c
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#include <ncurses.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#define ROW_SIZE 16
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#define CTRL_KEY(k) ((k) & 0x1f)
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unsigned char* buffer;
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long file_size;
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char* filename;
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int cursor_pos = 0;
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int scroll_offset = 0;
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void load_file(const char* fname) {
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FILE* f = fopen(fname, "rb");
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if (!f) {
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perror("Nie można otworzyć pliku");
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exit(1);
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}
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fseek(f, 0, SEEK_END);
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file_size = ftell(f);
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rewind(f);
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buffer = malloc(file_size);
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fread(buffer, 1, file_size, f);
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fclose(f);
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}
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void save_file() {
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FILE* f = fopen(filename, "wb");
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if (f) {
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fwrite(buffer, 1, file_size, f);
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fclose(f);
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}
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}
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void draw_interface() {
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clear();
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int max_y, max_x;
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getmaxyx(stdscr, max_y, max_x);
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attron(COLOR_PAIR(1));
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mvprintw(0, 0, "HEXED: %s (ROZMIAR: %ld bajtow)", filename, file_size);
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mvprintw(
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1, 0,
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"^S: Zapisz | ^Q: Wyjscie | Strzalki: Nawigacja | +/-: Zmien wartosc");
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mvhline(2, 0, ACS_HLINE, max_x);
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attroff(COLOR_PAIR(1));
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int rows_to_draw = max_y - 4;
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for (int i = 0; i < rows_to_draw; i++) {
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int offset = scroll_offset + (i * ROW_SIZE);
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if (offset >= file_size) break;
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attron(COLOR_PAIR(1));
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mvprintw(3 + i, 0, "%08X: ", offset);
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attroff(COLOR_PAIR(1));
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for (int j = 0; j < ROW_SIZE; j++) {
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if (offset + j < file_size) {
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unsigned char val = buffer[offset + j];
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int color_pair = (val == 0x00) ? 3 : 2;
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if (offset + j == cursor_pos) {
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attron(COLOR_PAIR(4));
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printw("%02X ", val);
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attroff(COLOR_PAIR(4));
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} else {
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attron(COLOR_PAIR(color_pair));
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printw("%02X ", val);
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attroff(COLOR_PAIR(color_pair));
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}
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} else {
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printw(" ");
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}
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}
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printw("| ");
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for (int j = 0; j < ROW_SIZE; j++) {
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if (offset + j < file_size) {
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unsigned char c = buffer[offset + j];
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char ch = (isprint(c)) ? c : '.';
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int color_pair = (c == 0x00) ? 3 : 2;
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if (offset + j == cursor_pos) {
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attron(COLOR_PAIR(4));
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printw("%c", ch);
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attroff(COLOR_PAIR(4));
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} else {
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attron(COLOR_PAIR(color_pair));
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printw("%c", ch);
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attroff(COLOR_PAIR(color_pair));
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}
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}
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}
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}
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refresh();
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}
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void update_byte(int ch) {
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int val = -1;
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if (ch >= '0' && ch <= '9') val = ch - '0';
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if (ch >= 'a' && ch <= 'f') val = ch - 'a' + 10;
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if (ch >= 'A' && ch <= 'F') val = ch - 'A' + 10;
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if (val != -1) {
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buffer[cursor_pos] = (buffer[cursor_pos] << 4) | val;
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}
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}
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int main(int argc, char* argv[]) {
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if (argc < 2) {
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printf("Uzycie: %s <plik>\n", argv[0]);
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return 1;
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}
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filename = argv[1];
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load_file(filename);
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initscr();
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start_color();
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use_default_colors();
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init_pair(1, COLOR_CYAN, -1);
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init_pair(2, COLOR_WHITE, -1);
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init_pair(3, COLOR_BLUE, -1);
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init_pair(4, COLOR_BLACK, COLOR_WHITE);
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raw();
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noecho();
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keypad(stdscr, TRUE);
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curs_set(0);
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int ch;
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int max_y, max_x;
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draw_interface();
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int running = 1;
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while (running) {
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ch = getch();
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getmaxyx(stdscr, max_y, max_x);
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switch (ch) {
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case CTRL_KEY('q'):
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running = 0;
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break;
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case KEY_UP:
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if (cursor_pos >= ROW_SIZE) cursor_pos -= ROW_SIZE;
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break;
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case KEY_DOWN:
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if (cursor_pos + ROW_SIZE < file_size) cursor_pos += ROW_SIZE;
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break;
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case KEY_LEFT:
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if (cursor_pos > 0) cursor_pos--;
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break;
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case KEY_RIGHT:
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if (cursor_pos < file_size - 1) cursor_pos++;
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break;
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case '+':
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buffer[cursor_pos]++;
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break;
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case '-':
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buffer[cursor_pos]--;
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break;
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case CTRL_KEY('s'):
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save_file();
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mvprintw(max_y - 1, 0, "ZAPISANO!");
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break;
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case KEY_NPAGE: {
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int rows = max_y - 4;
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int jump = rows * ROW_SIZE;
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if (cursor_pos + jump < file_size) {
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cursor_pos += jump;
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} else {
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cursor_pos = file_size - 1;
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}
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} break;
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case KEY_PPAGE: {
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int rows = max_y - 4;
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int jump = rows * ROW_SIZE;
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if (cursor_pos - jump >= 0) {
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cursor_pos -= jump;
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} else {
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cursor_pos = 0;
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}
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} break;
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default:
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update_byte(ch);
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break;
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}
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int rows_on_screen = max_y - 4;
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int cursor_row_start = (cursor_pos / ROW_SIZE) * ROW_SIZE;
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if (cursor_pos < scroll_offset) {
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scroll_offset = cursor_row_start;
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}
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else if (cursor_pos >= scroll_offset + (rows_on_screen * ROW_SIZE)) {
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scroll_offset = cursor_row_start - ((rows_on_screen - 1) * ROW_SIZE);
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if (scroll_offset < 0) scroll_offset = 0;
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}
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draw_interface();
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}
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endwin();
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free(buffer);
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return 0;
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}
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