Question about data strcutures

Hi,

    I have written an application which uses libMAD. I was looking at 
the code for the library and I find that two things are bothering me:

1. The majority of cleanup functions are just #define'd stubs and 
actually do nothing.

2. Why aren't the data structures typedef'd for easier use?

Just curious, and perhaps you can all provide me with a reaonable 
explanation that will make me more comfortable with it.

Thanks!!

Deven Phillips