This is a hex editor library that is meant to have a GUI (or TUI, when I refer to GUI I just mean some form of displaying it to the user) written that uses it, it is not the GUI itself. This lets it not have the gui handling code so built into itself, which is good and bad.
The main class Herix is what you will instantiate for your editor. It stores the loaded data and it's edits separately, and the edits only store what is needed.