// stream of bytes to numBits sized ints, 1<numBits<32
fcn fromBytes(n,[(numBits,acc,bitsSoFar,buf)]state){
   acc=acc.shiftLeft(8) + n; bitsSoFar+=8;
   buf.clear();
   while(bitsSoFar>=numBits){
      bitsSoFar-=numBits;
      buf.append(acc.shiftRight(bitsSoFar));
      acc=acc.bitAnd((-1).shiftLeft(bitsSoFar).bitNot());
   }
   state.clear(numBits,acc,bitsSoFar,buf);
   return(Void.Write,Void.Write,buf); // append contents of buf to result
}