org.brotli.dec.Utils Maven / Gradle / Ivy
/* Copyright 2015 Google Inc. All Rights Reserved.
Distributed under MIT license.
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
*/
package org.brotli.dec;
/**
* A set of utility methods.
*/
final class Utils {
private static final byte[] BYTE_ZEROES = new byte[1024];
private static final int[] INT_ZEROES = new int[1024];
/**
* Fills byte array with zeroes.
*
* Current implementation uses {@link System#arraycopy}, so it should be used for length not
* less than 16.
*
* @param dest array to fill with zeroes
* @param offset the first byte to fill
* @param length number of bytes to change
*/
static void fillWithZeroes(byte[] dest, int offset, int length) {
int cursor = 0;
while (cursor < length) {
int step = Math.min(cursor + 1024, length) - cursor;
System.arraycopy(BYTE_ZEROES, 0, dest, offset + cursor, step);
cursor += step;
}
}
/**
* Fills int array with zeroes.
*
*
Current implementation uses {@link System#arraycopy}, so it should be used for length not
* less than 16.
*
* @param dest array to fill with zeroes
* @param offset the first item to fill
* @param length number of item to change
*/
static void fillWithZeroes(int[] dest, int offset, int length) {
int cursor = 0;
while (cursor < length) {
int step = Math.min(cursor + 1024, length) - cursor;
System.arraycopy(INT_ZEROES, 0, dest, offset + cursor, step);
cursor += step;
}
}
}