content: /*
   * 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 org.apache.commons.codec.net;
  
  import org.apache.commons.codec.DecoderException;
  
  /**
   * Utility methods for this package.
   * 
   * @author <a href="mailto:ggregory@seagullsw.com">Gary Gregory</a>
   * @version $Id: Utils.java 798611 2009-07-28 17:10:44Z ggregory $
   * @since 1.4
   */
  class Utils {
  
      /**
       * Returns the numeric value of the character <code>b</code> in radix 16.
       * 
       * @param b
       *            The byte to be converted.
       * @return The numeric value represented by the character in radix 16.
       * 
       * @throws DecoderException
       *             Thrown when the byte is not valid per {@link Character#digit(char,int)}
       */
      static int digit16(byte b) throws DecoderException {
          int i = Character.digit((char) b, 16);
          if (i == -1) {
              throw new DecoderException("Invalid URL encoding: not a valid digit (radix " + URLCodec.RADIX + "): " + b);
          }
          return i;
      }
  
  }
  