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 com.alimama.mdrill.utils.zip;
  
  import java.util.zip.ZipException;
  
  /**
   * If this extra field is added as the very first extra field of the
   * archive, Solaris will consider it an executable jar file.
   *
   * @since Ant 1.6.3
   */
  public final class JarMarker implements ZipExtraField {
  
      private static final ZipShort ID = new ZipShort(0xCAFE);
      private static final ZipShort NULL = new ZipShort(0);
      private static final byte[] NO_BYTES = new byte[0];
      private static final JarMarker DEFAULT = new JarMarker();
  
      /** No-arg constructor */
      public JarMarker() {
          // empty
      }
  
      /**
       * Since JarMarker is stateless we can always use the same instance.
       * @return the DEFAULT jarmaker.
       */
      public static JarMarker getInstance() {
          return DEFAULT;
      }
  
      /**
       * The Header-ID.
       * @return the header id
       */
      public ZipShort getHeaderId() {
          return ID;
      }
  
      /**
       * Length of the extra field in the local file data - without
       * Header-ID or length specifier.
       * @return 0
       */
      public ZipShort getLocalFileDataLength() {
          return NULL;
      }
  
      /**
       * Length of the extra field in the central directory - without
       * Header-ID or length specifier.
       * @return 0
       */
      public ZipShort getCentralDirectoryLength() {
          return NULL;
      }
  
      /**
       * The actual data to put into local file data - without Header-ID
       * or length specifier.
       * @return the data
       * @since 1.1
       */
      public byte[] getLocalFileDataData() {
          return NO_BYTES;
      }
  
      /**
       * The actual data to put central directory - without Header-ID or
       * length specifier.
       * @return the data
       */
      public byte[] getCentralDirectoryData() {
          return NO_BYTES;
      }
  
      /**
       * Populate data from this array as if it was in local file data.
       * @param data an array of bytes
       * @param offset the start offset
       * @param length the number of bytes in the array from offset
       *
       * @throws ZipException on error
       */
      public void parseFromLocalFileData(byte[] data, int offset, int length)
          throws ZipException {
          if (length != 0) {
              throw new ZipException("JarMarker doesn't expect any data");
          }
      }
  }
  