Here is a list of all documented files with brief descriptions:

[detail level 123]

device_management
device_management.h	The ZEReader Device Management
epub
epub.h	The ZEReader EPUB library
event_handler
event_handler.h	The ZEReader Event Handler
sd
sd.h	The ZEReader SD card library
ui
context
context.h	The UI's context
context_def.h
fonts
notoserif_14.h
logo
zereaderlogomarx.h
widgets
book_menu.h
button.h
control_bar.h
logo.h
status_bar.h
text_area.h
ui.h	The ZEReader UI library
ui_style.h