gistfile1.hrl

-define(APPEND_IF_BIT_SET(BitMap, Bit, Binary, Continuation),
		case byteset:contains(BitMap, Bit) of
			true -> <<Binary/binary, Continuation>>;
			false -> Binary
		end).

-define(PREPEND_IF_BIT_SET(BitMap, Bit, 
                           PatternInBinary, PatternInList,
                           OldRestVar, NewRestVar, 
                           OldAccVar, NewAccVar),
		case byteset:contains(BitMap, Bit) of
			true ->
				<<PatternInBinary, NewRestVar/binary>> = OldRestVar,
				NewAccVar = [PatternInList | OldAccVar];
			false ->
				NewRestVar = OldRestVar,
				NewAccVar = OldAccVar
		end).