func: static void decode0(GetByteContext *gb, RangeCoder *rc, unsigned cumFreq, unsigned freq, unsigned total_freq)
  
  {
  
      int t = rc->range * (uint64_t)cumFreq / total_freq;
  
  
  
      rc->code1 += t + 1;
  
      rc->range = rc->range * (uint64_t)(freq + cumFreq) / total_freq - (t + 1);
  
  
  
      while (rc->range < TOP && bytestream2_get_bytes_left(gb) > 0) {
  
          unsigned byte = bytestream2_get_byte(gb);
  
          rc->code = (rc->code << 8) | byte;
  
          rc->code1 <<= 8;
  
          rc->range <<= 8;
  
      }
  
  }
  