content: /*
   *  This file is part of AndroidIDE.
   *
   *  AndroidIDE is free software: you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation, either version 3 of the License, or
   *  (at your option) any later version.
   *
   *  AndroidIDE is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * reserved comment block
   * DO NOT REMOVE OR ALTER!
   */
  /*
   * Copyright 1999-2002,2004 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 jaxp.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;
      }
  }
  