Decoding bitmask?

[Ericsson, Björn]

Hello!
 
I'm working on decoding a binary message. The first variables are Mandatory, so they are easy to decode. The last of the mandatory variables is an 16 bit option mask where each bit corresponds to an optional variable that might follow directly after the OptionMask.
 
How can I decode this OptionMask, and then parse the optional variables, in the cleanest  and most "Erlang optimized" way?
 
<<Mandatory1, Mandatory2, OptionMask:16/binary, Rest/binary>> = Message,
etc...
 
/BE


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