| /* |
| * 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 */); |
| } |
| } |