hex_editor

🔢🛠️ Minimalist Hex Editor in C

This is a minimalist Hex Editor written in C. It allows you to open a file (e.g., index.html), view its contents in hexadecimal format, modify any byte, and save the changes back to the file.

✨ Features

• View file in hexadecimal: The program displays the file's contents in hexadecimal.
• Edit hex values: You can modify specific bytes by entering a file offset and a new hex value.
• Save changes: After making modifications, you can save the changes back to the file.

📂 Files

• hexeditor.c: The C source code for the hex editor.

🚀 How to Use

1. Compile the hex editor:

gcc -o hexeditor hexeditor.c

2. Run the hex editor:

./hexeditor <file>

Replace <file> with the file you want to edit (e.g., index.html).

If you don't have a file like index.html, you can download one using wget:

wget google.com -O index.html

Example:

./hexeditor index.html

3. Commands: Once the file is loaded, you can use the following commands to interact with the file:

• p: Print the file content from a specific location in hexadecimal format.

  • Enter a location (byte offset) from which you want to start printing.
  • The editor will display 10 bytes starting from that location.

• e: Edit the file content at a specific location.

  • Enter a location (byte offset) where you want to edit.
  • Provide a new hexadecimal value (e.g., 0xFF).
  • The value at that location will be updated to the new hex value.

• s: Save the changes and exit the program.

4. Example usage:

Enter a command ('p' to print, 'e' to edit, 's' to save and exit): p
Enter location to print from: 50

<Displays 10 bytes starting at location 50>

Enter a command ('p' to print, 'e' to edit, 's' to save and exit): e
Enter location to edit: 55
Enter new hex value (e.g., 0xFF): 0xAB
Value at location 55 changed to 0xAB

5. Save changes: After editing, use the s command to save changes and exit.

📦 Dependencies

• No external libraries required; only standard C libraries.

🗒️ Notes

• The editor works on binary files. Be cautious when editing as it directly modifies the file contents.
• It reads and writes up to 1024 bytes from the file. If the file is larger, it will only handle the first 1024 bytes.