public List<DataBlockIndex> indexes() {
            List<DataBlockIndex> indexes = new ArrayList<>(count);
            for (int i = 0; i < count; i++) {
                indexes.add(get(i));
            }
            return indexes;
        }
@param dataBlockSize The total size of the data blocks, which equals to index start position.
@param indexBlock    raw index data.
s3stream/src/main/java/com/automq/stream/s3/ObjectReader.java