mirror of
https://github.com/alibaba/druid.git
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113 lines
3.5 KiB
Java
113 lines
3.5 KiB
Java
/*
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* Copyright 1999-2101 Alibaba Group Holding Ltd.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.alibaba.druid.util;
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/**
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* format validation This class encodes/decodes hexadecimal data
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*
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* @author Jeffrey Rodriguez
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* @version $Id: HexBin.java,v 1.4 2007/07/19 04:38:32 ofung Exp $
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*/
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public final class HexBin {
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static private final int BASE_LENGTH = 128;
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static private final int LOOKUP_LENGTH = 16;
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static final private byte[] HEX_NUMBER_TABLE = new byte[BASE_LENGTH];
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static final private char[] UPPER_CHARS = new char[LOOKUP_LENGTH];
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static final private char[] LOWER_CHARS = new char[LOOKUP_LENGTH];
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static {
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for (int i = 0; i < BASE_LENGTH; i++) {
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HEX_NUMBER_TABLE[i] = -1;
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}
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for (int i = '9'; i >= '0'; i--) {
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HEX_NUMBER_TABLE[i] = (byte) (i - '0');
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}
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for (int i = 'F'; i >= 'A'; i--) {
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HEX_NUMBER_TABLE[i] = (byte) (i - 'A' + 10);
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}
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for (int i = 'f'; i >= 'a'; i--) {
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HEX_NUMBER_TABLE[i] = (byte) (i - 'a' + 10);
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}
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for (int i = 0; i < 10; i++) {
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UPPER_CHARS[i] = (char) ('0' + i);
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LOWER_CHARS[i] = (char) ('0' + i);
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}
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for (int i = 10; i <= 15; i++) {
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UPPER_CHARS[i] = (char) ('A' + i - 10);
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LOWER_CHARS[i] = (char) ('a' + i - 10);
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}
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}
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public static String encode(byte[] bytes) {
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return encode(bytes, true);
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}
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public static String encode(byte[] bytes, boolean upperCase) {
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if (bytes == null) {
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return null;
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}
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final char[] chars = upperCase ? UPPER_CHARS : LOWER_CHARS;
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char[] hex = new char[bytes.length * 2];
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for (int i = 0; i < bytes.length; i++) {
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int b = bytes[i] & 0xFF;
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hex[i * 2] = chars[b >> 4];
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hex[i * 2 + 1] = chars[b & 0xf];
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}
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return new String(hex);
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}
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/**
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* Decode hex string to a byte array
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*
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* @param encoded encoded string
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* @return return array of byte to encode
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*/
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static public byte[] decode(String encoded) {
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if (encoded == null) {
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return null;
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}
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int lengthData = encoded.length();
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if (lengthData % 2 != 0) {
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return null;
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}
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char[] binaryData = encoded.toCharArray();
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int lengthDecode = lengthData / 2;
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byte[] decodedData = new byte[lengthDecode];
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byte temp1, temp2;
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char tempChar;
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for (int i = 0; i < lengthDecode; i++) {
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tempChar = binaryData[i * 2];
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temp1 = (tempChar < BASE_LENGTH) ? HEX_NUMBER_TABLE[tempChar] : -1;
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if (temp1 == -1) {
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return null;
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}
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tempChar = binaryData[i * 2 + 1];
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temp2 = (tempChar < BASE_LENGTH) ? HEX_NUMBER_TABLE[tempChar] : -1;
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if (temp2 == -1) {
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return null;
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}
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decodedData[i] = (byte) ((temp1 << 4) | temp2);
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}
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return decodedData;
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}
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}
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