66 lines
2.3 KiB
Java
66 lines
2.3 KiB
Java
package nodomain.freeyourgadget.gadgetbridge.util;
|
|
|
|
import java.util.Collection;
|
|
|
|
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<Integer> 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);
|
|
}
|
|
}
|