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1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one or more
3    *  contributor license agreements.  See the NOTICE file distributed with
4    *  this work for additional information regarding copyright ownership.
5    *  The ASF licenses this file to You under the Apache License, Version 2.0
6    *  (the "License"); you may not use this file except in compliance with
7    *  the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   *  Unless required by applicable law or agreed to in writing, software
12   *  distributed under the License is distributed on an "AS IS" BASIS,
13   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   *  See the License for the specific language governing permissions and
15   *  limitations under the License.
16   */
17  package org.apache.commons.compress.archivers.zip;
18  
19  /**
20   * Various constants used throughout the package.
21   *
22   * @since 1.3
23   */
24  final class ZipConstants {
25      /** Masks last eight bits */
26      static final int BYTE_MASK = 0xFF;
27  
28      /** Length of a ZipShort in bytes */
29      static final int SHORT = 2;
30  
31      /** Length of a ZipLong in bytes */
32      static final int WORD = 4;
33  
34      /** Length of a ZipEightByteInteger in bytes */
35      static final int DWORD = 8;
36  
37      /** Initial ZIP specification version */
38      static final int INITIAL_VERSION = 10;
39  
40      /**
41       * ZIP specification version that introduced DEFLATE compression method.
42       *
43       * @since 1.15
44       */
45      static final int DEFLATE_MIN_VERSION = 20;
46  
47      /** ZIP specification version that introduced data descriptor method */
48      static final int DATA_DESCRIPTOR_MIN_VERSION = 20;
49  
50      /** ZIP specification version that introduced ZIP64 */
51      static final int ZIP64_MIN_VERSION = 45;
52  
53      /**
54       * Value stored in two-byte size and similar fields if ZIP64 extensions are used.
55       */
56      static final int ZIP64_MAGIC_SHORT = 0xFFFF;
57  
58      /**
59       * Value stored in four-byte size and similar fields if ZIP64 extensions are used.
60       */
61      static final long ZIP64_MAGIC = 0xFFFFFFFFL;
62  
63      private ZipConstants() {
64      }
65  
66  }