SQL_PARAM_OUTPUT_STREAM

Is SQL_PARAM_OUTPUT_STREAM supported currently by the FreeTDS driver?  
I am writing a OS X framework for data access use by my companies devs  
and am trying to present a simplified command and parameter paradigm  
for devs more used to a ADO.NET type of object model. The problem I am  
running into is that the dynamic nature of the parameter existence,  
data type, and direction make structure a bit of a nightmare (no news  
to the list members I am sure.) I have gotten by most of this but am  
really struggling with the output parameter data as difficult to bind  
to a buffer when I have no idea of data type, the number of buffers  
needed, etc. I had hoped to use SQLGetData to retrieve the parameter  
after execution but it appears I need SQL_PARAM_OUTPUT_STREAM and it  
does not appear to be available to me.

Is there a better approach to this problem or a better forum to ask  
the question?

TIA