spring security EncodingUtils 源码
spring security EncodingUtils 代码
文件路径：/crypto/src/main/java/org/springframework/security/crypto/util/EncodingUtils.java
/*
* Copyright 2011-2016 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.security.crypto.util;
/**
* Static helper for encoding data.
* <p>
* For internal use only.
*
* @author Keith Donald
*/
public final class EncodingUtils {
private EncodingUtils() {
}
/**
* Combine the individual byte arrays into one array.
*/
public static byte[] concatenate(byte[]... arrays) {
int length = 0;
for (byte[] array : arrays) {
length += array.length;
}
byte[] newArray = new byte[length];
int destPos = 0;
for (byte[] array : arrays) {
System.arraycopy(array, 0, newArray, destPos, array.length);
destPos += array.length;
}
return newArray;
}
/**
* Extract a sub array of bytes out of the byte array.
* @param array the byte array to extract from
* @param beginIndex the beginning index of the sub array, inclusive
* @param endIndex the ending index of the sub array, exclusive
*/
public static byte[] subArray(byte[] array, int beginIndex, int endIndex) {
int length = endIndex - beginIndex;
byte[] subarray = new byte[length];
System.arraycopy(array, beginIndex, subarray, 0, length);
return subarray;
}
}
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