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.core.ims.protocol.msrp;
  
  /**
   * MSRP utility functions
   * 
   * @author jexa7410
   */
  public class MsrpUtils {
      /**
       * Get the chunk size
       * 
       * @param header MSRP header
       * @return Size in bytes or 0 for "*" range
       */
      public static int getChunkSize(String header) {
          if (header == null) {
              return -1;
          }
          int index1 = header.indexOf("-");
          int index2 = header.indexOf("/");
          if ((index1 != -1) && (index2 != -1)) {
              try {
                  int lowByte = Integer.parseInt(header.substring(0, index1));
                  String highByteString = header.substring(index1 + 1, index2);
                  if (highByteString.equals("*")) {
                      return 0;
                  }
                  int highByte = Integer.parseInt(highByteString);
                  return (highByte - lowByte) + 1;
              } catch (NumberFormatException e) {
                  return -1;
              }
          }
          return -1;
      }
  
      /**
       * Get the total size
       * 
       * @param header MSRP header
       * @return Size in bytes
       */
      public static int getTotalSize(String header) {
          if (header == null) {
              return -1;
          }
          int index = header.indexOf("/");
          if (index != -1) {
              try {
                  return Integer.parseInt(header.substring(index + 1));
              } catch (NumberFormatException e) {
                  return -1;
              }
          }
          return -1;
      }
  }
  