select trigger - columns?

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Within a subroutine called by the select trigger, is there any way to find 
out which columns were SELECTed? I am altering some columns after they are 
read from the database, but I don't want that data altered again if I do a 
subsequent select.

Inflation/deflation will not work for me as I need to accept data from the 
user in one format and from the database in another format, and I cannot 
write an inflator to differentiate between the two (at least not just by 
looking at the data with no other clues).

RT