code: protected void setReadingPosition(int recordIndex, int byteIndex) throws IOException {
  		if (this.seekEnabled) {
  			this.nextExpectedRecordIndex = recordIndex;
  			this.buffer.position(byteIndex);
  		} else {
  			throw new SeekOperationDisabledException();
  		}
  	}
docs: Set the reading position, excluding the header.
  
  @param recordIndex is the index of the next record to read.
  @param byteIndex is the index of the next byte to read (excluding the header).
  @throws IOException in case of error.