basis/compression/run-length/run-length.factor

   1 ! Copyright (C) 2009 Doug Coleman.
   2 ! See http://factorcode.org/license.txt for BSD license.
   3 USING: arrays grouping sequences ;
   4 IN: compression.run-length
   5
   6 : run-length-uncompress8 ( byte-array -- byte-array' )
   7     2 group [ first2 <array> ] map concat ;