content: /*******************************************************************************
   * Software Name : RCS IMS Stack
   *
   * Copyright (C) 2010-2016 Orange.
   *
   * 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 com.gsma.rcs.utils;
  
  /**
   * IP address utility functions
   * 
   * @author B. JOGUET
   */
  public class IpAddressUtils {
  
      /**
       * Extract host address (see RFC4007 and RFC2373)
       * 
       * @param host Host address
       * @return Address
       */
      public static String extractHostAddress(String host) {
          if (host == null) {
              return null;
          }
  
          // Remove prefix from address
          int index = host.indexOf("/");
          if (index != -1) {
              host = host.substring(0, index);
          }
  
          // Remove zone id from address
          /*
           * RFC4007: <address>%<zone_id> where: <address> is a literal IPv6 address, <zone_id> is a
           * string identifying the zone of the address, and `%' is a delimiter character to
           * distinguish between <address> and <zone_id>.
           */
          index = host.indexOf("%");
          if (index != -1) {
              host = host.substring(0, index);
          }
  
          return host;
      }
  
  }
  