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/*
* 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 org.apache.tools.zip;
/**
* Wrapper for extra field data that doesn't conform to the recommended format of header-tag + size + data.
*
* <p>The header-id is artificial (and not listed as a known ID in
* {@link <a href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">
* APPNOTE.TXT</a>}). Since it isn't used anywhere except to satisfy the
* ZipExtraField contract it shouldn't matter anyway.</p>
*
* @since Ant 1.8.1
*/
public final class UnparseableExtraFieldData
implements CentralDirectoryParsingZipExtraField {
private static final ZipShort HEADER_ID = new ZipShort(0xACC1);
private byte[] localFileData;
private byte[] centralDirectoryData;
/**
* The Header-ID.
*
* @return a completely arbitrary value that should be ignored.
*/
public ZipShort getHeaderId() {
return HEADER_ID;
}
/**
* Length of the complete extra field in the local file data.
*
* @return The LocalFileDataLength value
*/
public ZipShort getLocalFileDataLength() {
return new ZipShort(localFileData == null ? 0 : localFileData.length);
}
/**
* Length of the complete extra field in the central directory.
*
* @return The CentralDirectoryLength value
*/
public ZipShort getCentralDirectoryLength() {
return centralDirectoryData == null
? getLocalFileDataLength()
: new ZipShort(centralDirectoryData.length);
}
/**
* The actual data to put into local file data.
*
* @return The LocalFileDataData value
*/
public byte[] getLocalFileDataData() {
return ZipUtil.copy(localFileData);
}
/**
* The actual data to put into central directory.
*
* @return The CentralDirectoryData value
*/
public byte[] getCentralDirectoryData() {
return centralDirectoryData == null
? getLocalFileDataData() : ZipUtil.copy(centralDirectoryData);
}
/**
* Populate data from this array as if it was in local file data.
*
* @param buffer the buffer to read data from
* @param offset offset into buffer to read data
* @param length the length of data
*/
public void parseFromLocalFileData(byte[] buffer, int offset, int length) {
localFileData = new byte[length];
System.arraycopy(buffer, offset, localFileData, 0, length);
}
/**
* Populate data from this array as if it was in central directory data.
*
* @param buffer the buffer to read data from
* @param offset offset into buffer to read data
* @param length the length of data
*/
public void parseFromCentralDirectoryData(byte[] buffer, int offset,
int length) {
centralDirectoryData = new byte[length];
System.arraycopy(buffer, offset, centralDirectoryData, 0, length);
if (localFileData == null) {
parseFromLocalFileData(buffer, offset, length);
}
}
}
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