| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 com.sun.org.apache.xerces.internal.impl.dv.util; |
| |
| /** |
| * format validation |
| * |
| * This class encodes/decodes hexadecimal data |
| * |
| * @xerces.internal |
| * |
| * @author Jeffrey Rodriguez |
| */ |
| public final class HexBin { |
| static private final int BASELENGTH = 128; |
| static private final int LOOKUPLENGTH = 16; |
| static final private byte [] hexNumberTable = new byte[BASELENGTH]; |
| static final private char [] lookUpHexAlphabet = new char[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] = (char)('0'+i); |
| } |
| for(int i = 10; i<=15; i++ ) { |
| lookUpHexAlphabet[i] = (char)('A'+i -10); |
| } |
| } |
| |
| /** |
| * Encode a byte array to hex string |
| * |
| * @param binaryData array of byte to encode |
| * @return return encoded string |
| */ |
| static public String encode(byte[] binaryData) { |
| if (binaryData == null) |
| return null; |
| int lengthData = binaryData.length; |
| int lengthEncode = lengthData * 2; |
| char[] encodedData = new char[lengthEncode]; |
| int temp; |
| for (int i = 0; i < lengthData; i++) { |
| temp = binaryData[i]; |
| if (temp < 0) |
| temp += 256; |
| encodedData[i*2] = lookUpHexAlphabet[temp >> 4]; |
| encodedData[i*2+1] = lookUpHexAlphabet[temp & 0xf]; |
| } |
| return new String(encodedData); |
| } |
| |
| /** |
| * Decode hex string to a byte array |
| * |
| * @param encoded encoded string |
| * @return return array of byte to encode |
| */ |
| static public byte[] decode(String encoded) { |
| if (encoded == null) |
| return null; |
| int lengthData = encoded.length(); |
| if (lengthData % 2 != 0) |
| return null; |
| |
| char[] binaryData = encoded.toCharArray(); |
| int lengthDecode = lengthData / 2; |
| byte[] decodedData = new byte[lengthDecode]; |
| byte temp1, temp2; |
| char tempChar; |
| for( int i = 0; i<lengthDecode; i++ ){ |
| tempChar = binaryData[i*2]; |
| temp1 = (tempChar < BASELENGTH) ? hexNumberTable[tempChar] : -1; |
| if (temp1 == -1) |
| return null; |
| tempChar = binaryData[i*2+1]; |
| temp2 = (tempChar < BASELENGTH) ? hexNumberTable[tempChar] : -1; |
| if (temp2 == -1) |
| return null; |
| decodedData[i] = (byte)((temp1 << 4) | temp2); |
| } |
| return decodedData; |
| } |
| } |