001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019 package org.apache.commons.compress.archivers.zip; 020 021 /** 022 * Simple placeholder for all those extra fields we don't want to deal 023 * with. 024 * 025 * <p>Assumes local file data and central directory entries are 026 * identical - unless told the opposite.</p> 027 * @NotThreadSafe 028 */ 029 public class UnrecognizedExtraField implements ZipExtraField { 030 031 /** 032 * The Header-ID. 033 */ 034 private ZipShort headerId; 035 036 /** 037 * Set the header id. 038 * @param headerId the header id to use 039 */ 040 public void setHeaderId(ZipShort headerId) { 041 this.headerId = headerId; 042 } 043 044 /** 045 * Get the header id. 046 * @return the header id 047 */ 048 public ZipShort getHeaderId() { 049 return headerId; 050 } 051 052 /** 053 * Extra field data in local file data - without 054 * Header-ID or length specifier. 055 */ 056 private byte[] localData; 057 058 /** 059 * Set the extra field data in the local file data - 060 * without Header-ID or length specifier. 061 * @param data the field data to use 062 */ 063 public void setLocalFileDataData(byte[] data) { 064 localData = copy(data); 065 } 066 067 /** 068 * Get the length of the local data. 069 * @return the length of the local data 070 */ 071 public ZipShort getLocalFileDataLength() { 072 return new ZipShort(localData.length); 073 } 074 075 /** 076 * Get the local data. 077 * @return the local data 078 */ 079 public byte[] getLocalFileDataData() { 080 return copy(localData); 081 } 082 083 /** 084 * Extra field data in central directory - without 085 * Header-ID or length specifier. 086 */ 087 private byte[] centralData; 088 089 /** 090 * Set the extra field data in central directory. 091 * @param data the data to use 092 */ 093 public void setCentralDirectoryData(byte[] data) { 094 centralData = copy(data); 095 } 096 097 /** 098 * Get the central data length. 099 * If there is no central data, get the local file data length. 100 * @return the central data length 101 */ 102 public ZipShort getCentralDirectoryLength() { 103 if (centralData != null) { 104 return new ZipShort(centralData.length); 105 } 106 return getLocalFileDataLength(); 107 } 108 109 /** 110 * Get the central data. 111 * @return the central data if present, else return the local file data 112 */ 113 public byte[] getCentralDirectoryData() { 114 if (centralData != null) { 115 return copy(centralData); 116 } 117 return getLocalFileDataData(); 118 } 119 120 /** 121 * @param data the array of bytes. 122 * @param offset the source location in the data array. 123 * @param length the number of bytes to use in the data array. 124 * @see ZipExtraField#parseFromLocalFileData(byte[], int, int) 125 */ 126 public void parseFromLocalFileData(byte[] data, int offset, int length) { 127 byte[] tmp = new byte[length]; 128 System.arraycopy(data, offset, tmp, 0, length); 129 setLocalFileDataData(tmp); 130 } 131 132 /** 133 * @param data the array of bytes. 134 * @param offset the source location in the data array. 135 * @param length the number of bytes to use in the data array. 136 * @see ZipExtraField#parseFromCentralDirectoryData(byte[], int, int) 137 */ 138 public void parseFromCentralDirectoryData(byte[] data, int offset, 139 int length) { 140 byte[] tmp = new byte[length]; 141 System.arraycopy(data, offset, tmp, 0, length); 142 setCentralDirectoryData(tmp); 143 if (localData == null) { 144 setLocalFileDataData(tmp); 145 } 146 } 147 148 private static byte[] copy(byte[] from) { 149 if (from != null) { 150 byte[] to = new byte[from.length]; 151 System.arraycopy(from, 0, to, 0, to.length); 152 return to; 153 } 154 return null; 155 } 156 }