content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.arrow.vector.util;
  
  /** Utilities for rounding data size. */
  public final class DataSizeRoundingUtil {
  
    /** The mask for rounding an integer to a multiple of 8. (i.e. clear the lowest 3 bits) */
    public static int ROUND_8_MASK_INT = 0xFFFFFFF8;
  
    /** The mask for rounding a long integer to a multiple of 8. (i.e. clear the lowest 3 bits) */
    public static long ROUND_8_MASK_LONG = 0xFFFFFFFFFFFFFFF8L;
  
    /** The number of bits to shift for dividing by 8. */
    public static int DIVIDE_BY_8_SHIFT_BITS = 3;
  
    /**
     * Round up the number to the nearest multiple of 8.
     *
     * @param input the number to round.
     * @return the rounded number.
     */
    public static int roundUpTo8Multiple(int input) {
      return (input + 7) & ROUND_8_MASK_INT;
    }
  
    /**
     * Round up the number to the nearest multiple of 8.
     *
     * @param input the number to round.
     * @return the rounded number
     */
    public static long roundUpTo8Multiple(long input) {
      return (input + 7L) & ROUND_8_MASK_LONG;
    }
  
    /**
     * Round down the number to the nearest multiple of 8.
     *
     * @param input the number to round.
     * @return the rounded number.
     */
    public static int roundDownTo8Multiple(int input) {
      return input & ROUND_8_MASK_INT;
    }
  
    /**
     * Round down the number to the nearest multiple of 8.
     *
     * @param input the number to round.
     * @return the rounded number
     */
    public static long roundDownTo8Multiple(long input) {
      return input & ROUND_8_MASK_LONG;
    }
  
    /**
     * A fast way to compute Math.ceil(input / 8.0).
     *
     * @param input the input number.
     * @return the computed number.
     */
    public static int divideBy8Ceil(int input) {
      return (input + 7) >>> DIVIDE_BY_8_SHIFT_BITS;
    }
  
    /**
     * A fast way to compute Math.ceil(input / 8.0).
     *
     * @param input the input number.
     * @return the computed number.
     */
    public static long divideBy8Ceil(long input) {
      return (input + 7) >>> (long) DIVIDE_BY_8_SHIFT_BITS;
    }
  
    public static long roundUpToMultipleOf16(long num) {
      return (num + 15) & 0xFFFFFFFFFFFFFFF0L;
    }
  
    private DataSizeRoundingUtil() {}
  }
  