org.apache.tools.tar.TarArchiveSparseEntry Maven / Gradle / Ivy
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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.tar;
import java.io.IOException;
/**
* This class represents a sparse entry in a Tar archive.
*
*
* The C structure for a sparse entry is:
*
* struct posix_header {
* struct sparse sp[21]; // TarConstants.SPARSELEN_GNU_SPARSE - offset 0
* char isextended; // TarConstants.ISEXTENDEDLEN_GNU_SPARSE - offset 504
* };
*
* Whereas, "struct sparse" is:
*
* struct sparse {
* char offset[12]; // offset 0
* char numbytes[12]; // offset 12
* };
*
*/
public class TarArchiveSparseEntry implements TarConstants {
/** If an extension sparse header follows. */
private boolean isExtended;
/**
* Construct an entry from an archive's header bytes. File is set
* to null.
*
* @param headerBuf The header bytes from a tar archive entry.
* @throws IOException on unknown format
*/
public TarArchiveSparseEntry(byte[] headerBuf) throws IOException {
int offset = 0;
offset += SPARSELEN_GNU_SPARSE;
isExtended = TarUtils.parseBoolean(headerBuf, offset);
}
public boolean isExtended() {
return isExtended;
}
}