Android Hex String Create decodeHexStr(final String str)

Description

decode Hex Str

License

Apache License

Declaration

public static byte[] decodeHexStr(final String str) 

Method Source Code

//package com.java2s;
/*//from  ww w  .j  ava2s  . c  o  m
 * Copyright 1999-2101 Alibaba Group.
 *
 * 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.
 */

public class Main {
    public static byte[] decodeHexStr(final String str) {
        if (str == null) {
            return null;
        }
        char[] charArray = str.toCharArray();
        if (charArray.length % 2 != 0) {
            throw new RuntimeException(
                    "hex str length must can mod 2, str:" + str);
        }
        byte[] bytes = new byte[charArray.length / 2];
        for (int i = 0; i < charArray.length; i++) {
            char c = charArray[i];
            int b;
            if (c >= '0' && c <= '9') {
                b = (c - '0') << 4;
            } else if (c >= 'A' && c <= 'F') {
                b = (c - 'A' + 10) << 4;
            } else {
                throw new RuntimeException("unsport hex str:" + str);
            }
            c = charArray[++i];
            if (c >= '0' && c <= '9') {
                b |= c - '0';
            } else if (c >= 'A' && c <= 'F') {
                b |= c - 'A' + 10;
            } else {
                throw new RuntimeException("unsport hex str:" + str);
            }
            bytes[i / 2] = (byte) b;
        }
        return bytes;
    }
}

Related

1. FileNamePathExtension(String filename)
2. pathExtension(String fileName)
3. hexStringToBytes(String hexString)
4. appendHex(StringBuffer stringbuffer, byte byte0)
5. toHexString(char achar0)
6. hexDigest(String input)
7. hexToBt64(String hex)
8. hexToBytes(String hex)
9. convertToHex(byte[] data)