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/*
* 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.spark.unsafe.array;
import org.apache.spark.unsafe.Platform;
public class ByteArrayMethods {
private ByteArrayMethods() {
// Private constructor, since this class only contains static methods.
}
/** Returns the next number greater or equal num that is power of 2. */
public static long nextPowerOf2(long num) {
final long highBit = Long.highestOneBit(num);
return (highBit == num) ? num : highBit << 1;
}
public static int roundNumberOfBytesToNearestWord(int numBytes) {
int remainder = numBytes & 0x07; // This is equivalent to `numBytes % 8`
if (remainder == 0) {
return numBytes;
} else {
return numBytes + (8 - remainder);
}
}
/**
* Optimized byte array equality check for byte arrays.
* @return true if the arrays are equal, false otherwise
*/
public static boolean arrayEquals(
Object leftBase, long leftOffset, Object rightBase, long rightOffset, final long length) {
int i = 0;
while (i <= length - 8) {
if (Platform.getLong(leftBase, leftOffset + i) !=
Platform.getLong(rightBase, rightOffset + i)) {
return false;
}
i += 8;
}
while (i < length) {
if (Platform.getByte(leftBase, leftOffset + i) !=
Platform.getByte(rightBase, rightOffset + i)) {
return false;
}
i += 1;
}
return true;
}
}
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