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 = ZipUtil.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 ZipUtil.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 = ZipUtil.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 ZipUtil.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 }