/* Copyright (C) 2016-2020 Andreas Shimokawa, Carsten Pfeiffer
This file is part of Gadgetbridge.
Gadgetbridge is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Gadgetbridge is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see . */
package nodomain.freeyourgadget.gadgetbridge.util;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
public class ArrayUtils {
/**
* Checks the two given arrays for equality, but comparing the second array with a specified
* subset of the first array.
*
* @param first the array in which to look for the second array
* @param second the data to look for inside the first array
* @param startIndex the start index (inclusive) inside the first array from which to start the comparison
* @return whether the second byte array is equal to the specified subset of the first byte array
* @throws IllegalArgumentException when one of the arrays is null or start index/length are wrong
*/
public static boolean equals(byte[] first, byte[] second, int startIndex) {
if (first == null) {
throw new IllegalArgumentException("first must not be null");
}
if (second == null) {
throw new IllegalArgumentException("second must not be null");
}
if (startIndex < 0) {
throw new IllegalArgumentException("startIndex must be >= 0");
}
if (second.length + startIndex > first.length) {
return false;
}
for (int i = 0; i < second.length; i++) {
if (first[startIndex + i] != second[i]) {
return false;
}
}
return true;
}
/**
* Converts a collection of Integer values to an int[] array.
* @param values
* @return null if the given collection is null, otherwise an array of the same size as the collection
* @throws NullPointerException when an element of the collection is null
*/
public static int[] toIntArray(Collection values) {
if (values == null) {
return null;
}
int i = 0;
int[] result = new int[values.size()];
for (Integer value : values) {
result[i++] = value;
}
return result;
}
/**
* Returns true if the given byte array starts with the given values
* @param array the array to check
* @param values the values which the other array is checked to start with
* @return
*/
public static boolean startsWith(byte[] array, byte[] values) {
return equals(array, values, 0);
}
}