Currently the C binding supports...

• write
• read
• delete
• stat
• is_exist
• list

The missing functionalities are.... (welcome to add up)

• async support
• check()
• copy()
• rename()
• remove() (remove_all(), remove_via())
• reader()
• writer()
• Future APIs (append (through write_with(...).append(...)), etc.)
  • This may need some discussions on the implementations since the C does not have such concepts as Future.
• presign APIs (I think this could be considered later)