| /* Copyright 2004 The Apache Software Foundation |
| * |
| * 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 org.apache.xmlbeans.impl.util; |
| |
| import java.nio.charset.StandardCharsets; |
| |
| /** |
| * format validation |
| * <p> |
| * This class encodes/decodes hexadecimal data |
| */ |
| public final class HexBin { |
| static private final int BASELENGTH = 255; |
| static private final int LOOKUPLENGTH = 16; |
| static private byte[] hexNumberTable = new byte[BASELENGTH]; |
| static private byte[] lookUpHexAlphabet = new byte[LOOKUPLENGTH]; |
| |
| |
| static { |
| for (int i = 0; i < BASELENGTH; i++) { |
| hexNumberTable[i] = -1; |
| } |
| for (int i = '9'; i >= '0'; i--) { |
| hexNumberTable[i] = (byte) (i - '0'); |
| } |
| for (int i = 'F'; i >= 'A'; i--) { |
| hexNumberTable[i] = (byte) (i - 'A' + 10); |
| } |
| for (int i = 'f'; i >= 'a'; i--) { |
| hexNumberTable[i] = (byte) (i - 'a' + 10); |
| } |
| |
| for (int i = 0; i < 10; i++) { |
| lookUpHexAlphabet[i] = (byte) ('0' + i); |
| } |
| for (int i = 10; i <= 15; i++) { |
| lookUpHexAlphabet[i] = (byte) ('A' + i - 10); |
| } |
| } |
| |
| /** |
| * byte to be tested if it is Base64 alphabet |
| * |
| * @param octect |
| * @return |
| */ |
| static boolean isHex(byte octect) { |
| return (hexNumberTable[octect] != -1); |
| } |
| |
| /** |
| * Converts bytes to a hex string |
| */ |
| static public String bytesToString(byte[] binaryData) { |
| if (binaryData == null) { |
| return null; |
| } |
| return new String(encode(binaryData), StandardCharsets.ISO_8859_1); |
| } |
| |
| /** |
| * Converts a hex string to a byte array. |
| */ |
| static public byte[] stringToBytes(String hexEncoded) { |
| return decode(hexEncoded.getBytes(StandardCharsets.ISO_8859_1)); |
| } |
| |
| /** |
| * array of byte to encode |
| * |
| * @param binaryData |
| * @return return encode binary array |
| */ |
| static public byte[] encode(byte[] binaryData) { |
| if (binaryData == null) { |
| return null; |
| } |
| int lengthData = binaryData.length; |
| int lengthEncode = lengthData * 2; |
| byte[] encodedData = new byte[lengthEncode]; |
| for (int i = 0; i < lengthData; i++) { |
| encodedData[i * 2] = lookUpHexAlphabet[(binaryData[i] >> 4) & 0xf]; |
| encodedData[i * 2 + 1] = lookUpHexAlphabet[binaryData[i] & 0xf]; |
| } |
| return encodedData; |
| } |
| |
| static public byte[] decode(byte[] binaryData) { |
| if (binaryData == null) { |
| return null; |
| } |
| int lengthData = binaryData.length; |
| if (lengthData % 2 != 0) { |
| return null; |
| } |
| |
| int lengthDecode = lengthData / 2; |
| byte[] decodedData = new byte[lengthDecode]; |
| for (int i = 0; i < lengthDecode; i++) { |
| if (!isHex(binaryData[i * 2]) || !isHex(binaryData[i * 2 + 1])) { |
| return null; |
| } |
| decodedData[i] = (byte) ((hexNumberTable[binaryData[i * 2]] << 4) | hexNumberTable[binaryData[i * 2 + 1]]); |
| } |
| return decodedData; |
| } |
| |
| /** |
| * Decodes Hex data into octects |
| * |
| * @param binaryData String containing Hex data |
| * @return string containing decoded data. |
| */ |
| public static String decode(String binaryData) { |
| if (binaryData == null) { |
| return null; |
| } |
| |
| byte[] decoded = decode(binaryData.getBytes(StandardCharsets.ISO_8859_1)); |
| return decoded == null ? null : new String(decoded, StandardCharsets.UTF_8); |
| } |
| |
| /** |
| * Encodes octects (using utf-8) into Hex data |
| * |
| * @param binaryData String containing Hex data |
| * @return string containing decoded data. |
| */ |
| public static String encode(String binaryData) { |
| if (binaryData == null) { |
| return null; |
| } |
| |
| byte[] encoded = encode(binaryData.getBytes(StandardCharsets.UTF_8)); |
| return encoded == null ? null : new String(encoded, StandardCharsets.ISO_8859_1); |
| } |
| |
| } |