to_size_factor
start_base = to_size_factor(range_startk, &start_factor);
size_base = to_size_factor(sizek, &size_factor);
size_base = to_size_factor(size_base, &size_factor);
start_base = to_size_factor(start_base, &start_factor);
gran_base = to_size_factor(result[i].gran_sizek, &gran_factor);
chunk_base = to_size_factor(result[i].chunk_sizek, &chunk_factor);
lose_base = to_size_factor(result[i].lose_cover_sizek, &lose_factor);