int decode( rawdec* s ) {
    uint len, code=0, first=0, num, index=0;
    for( len=1; len<=15; len++ ) {
      num = count[len];
      (code<<=1) += s->bits(1);
      (first<<=1) += num;
      index += num;
      if( code < first ) return symbol[index+(code-first)];
    }
    return -9;
  }