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/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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
*
* 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 android.util;
import libcore.util.HexEncoding;
/**
* A utility class for common byte array to hex string operations and vise versa.
*
* @hide
*/
public final class ByteStringUtils {
private ByteStringUtils() {
/* hide constructor */
}
/**
* Returns the hex encoded string representation of bytes.
* @param bytes Byte array to encode.
* @return Hex encoded string representation of bytes.
*/
public static String toHexString(byte[] bytes) {
if (bytes == null || bytes.length == 0 || bytes.length % 2 != 0) {
return null;
}
return HexEncoding.encodeToString(bytes, true /* upperCase */);
}
/**
* Returns the decoded byte array representation of str.
* @param str Hex encoded string to decode.
* @return Decoded byte array representation of str.
*/
public static byte[] fromHexToByteArray(String str) {
if (str == null || str.length() == 0 || str.length() % 2 != 0) {
return null;
}
return HexEncoding.decode(str, false /* allowSingleChar */);
}
}
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