Check if the current character is an Hex Char <hex> ::= [0x30-0x39] | [0x41-0x46] | [0x61-0x66] : Hexadecimal « Data Type « Java






  1. Java
  2. Data Type
  3. Hexadecimal

Check if the current character is an Hex Char <hex> ::= [0x30-0x39] | [0x41-0x46] | [0x61-0x66]

      
import java.io.File;
import java.io.FileFilter;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

/*
 *  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. 
 *  
 */



/**
 * Various string manipulation methods that are more efficient then chaining
 * string operations: all is done in the same buffer without creating a bunch of
 * string objects.
 * 
 * @author <a href="mailto:dev@labs.apache.org">Dungeon Project</a>
 */
public class Main {
  /** &lt;hex> ::= [0x30-0x39] | [0x41-0x46] | [0x61-0x66] */
  private static final boolean[] HEX =
      { 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          true,  true,  true,  true,  true,  true,  true,  true, 
          true,  true,  false, false, false, false, false, false, 
          false, true,  true,  true,  true,  true,  true,  false, 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          false, true,  true,  true,  true,  true,  true,  false, 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false, 
          false, false, false, false, false, false, false, false };

  /**
   * Check if the current character is an Hex Char &lt;hex> ::= [0x30-0x39] |
   * [0x41-0x46] | [0x61-0x66]
   * 
   * @param byteArray
   *            The buffer which contains the data
   * @param index
   *            Current position in the buffer
   * @return <code>true</code> if the current character is a Hex Char
   */
  public static final boolean isHex( byte[] byteArray, int index )
  {
      if ( ( byteArray == null ) || ( byteArray.length == 0 ) || ( index < 0 ) || ( index >= byteArray.length ) )
      {
          return false;
      }
      else
      {
          byte c = byteArray[index];

          if ( ( ( c | 0x7F ) != 0x7F ) || ( HEX[c] == false ) )
          {
              return false;
          }
          else
          {
              return true;
          }
      }
  }
}








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