This is the adaptive arithmetic coding software by R. M. Neal that 
is contained in the following reference:

  Witten, I. H., Neal, R. M., and Cleary, J. G. (1987) 
    ``Arithmetic coding for data compression'', Communications 
    of the ACM, vol. 30, no. 6 (June).


Ported to Cyclone 5/16/2001, James Cheney
