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Apache Commons Compress software defines an API for working with
compression and archive formats. These include: bzip2, gzip, pack200,
lzma, xz, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4,
Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj.
/*
* 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.commons.compress.archivers.examples;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
import java.nio.channels.SeekableByteChannel;
import java.nio.file.Files;
import java.nio.file.StandardOpenOption;
import java.util.Enumeration;
import org.apache.commons.compress.archivers.ArchiveEntry;
import org.apache.commons.compress.archivers.ArchiveException;
import org.apache.commons.compress.archivers.ArchiveInputStream;
import org.apache.commons.compress.archivers.ArchiveStreamFactory;
import org.apache.commons.compress.archivers.sevenz.SevenZFile;
import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
import org.apache.commons.compress.archivers.zip.ZipFile;
import org.apache.commons.compress.utils.IOUtils;
/**
* Provides a high level API for expanding archives.
* @since 1.17
*/
public class Expander {
private interface ArchiveEntrySupplier {
ArchiveEntry getNextReadableEntry() throws IOException;
}
private interface EntryWriter {
void writeEntryDataTo(ArchiveEntry entry, OutputStream out) throws IOException;
}
/**
* Expands {@code archive} into {@code targetDirectory}.
*
* Tries to auto-detect the archive's format.
*
* @param archive the file to expand
* @param targetDirectory the directory to write to
* @throws IOException if an I/O error occurs
* @throws ArchiveException if the archive cannot be read for other reasons
*/
public void expand(File archive, File targetDirectory) throws IOException, ArchiveException {
String format = null;
try (InputStream i = new BufferedInputStream(Files.newInputStream(archive.toPath()))) {
format = new ArchiveStreamFactory().detect(i);
}
expand(format, archive, targetDirectory);
}
/**
* Expands {@code archive} into {@code targetDirectory}.
*
* @param archive the file to expand
* @param targetDirectory the directory to write to
* @param format the archive format. This uses the same format as
* accepted by {@link ArchiveStreamFactory}.
* @throws IOException if an I/O error occurs
* @throws ArchiveException if the archive cannot be read for other reasons
*/
public void expand(String format, File archive, File targetDirectory) throws IOException, ArchiveException {
if (prefersSeekableByteChannel(format)) {
try (SeekableByteChannel c = FileChannel.open(archive.toPath(), StandardOpenOption.READ)) {
expand(format, c, targetDirectory, CloseableConsumer.CLOSING_CONSUMER);
}
return;
}
try (InputStream i = new BufferedInputStream(Files.newInputStream(archive.toPath()))) {
expand(format, i, targetDirectory, CloseableConsumer.CLOSING_CONSUMER);
}
}
/**
* Expands {@code archive} into {@code targetDirectory}.
*
* Tries to auto-detect the archive's format.
*
* This method creates a wrapper around the archive stream
* which is never closed and thus leaks resources, please use
* {@link #expand(InputStream,File,CloseableConsumer)}
* instead.
*
* @param archive the file to expand
* @param targetDirectory the directory to write to
* @throws IOException if an I/O error occurs
* @throws ArchiveException if the archive cannot be read for other reasons
* @deprecated this method leaks resources
*/
@Deprecated
public void expand(InputStream archive, File targetDirectory) throws IOException, ArchiveException {
expand(archive, targetDirectory, CloseableConsumer.NULL_CONSUMER);
}
/**
* Expands {@code archive} into {@code targetDirectory}.
*
* Tries to auto-detect the archive's format.
*
* This method creates a wrapper around the archive stream and
* the caller of this method is responsible for closing it -
* probably at the same time as closing the stream itself. The
* caller is informed about the wrapper object via the {@code
* closeableConsumer} callback as soon as it is no longer needed
* by this class.
*
* @param archive the file to expand
* @param targetDirectory the directory to write to
* @param closeableConsumer is informed about the stream wrapped around the passed in stream
* @throws IOException if an I/O error occurs
* @throws ArchiveException if the archive cannot be read for other reasons
* @since 1.19
*/
public void expand(InputStream archive, File targetDirectory, CloseableConsumer closeableConsumer)
throws IOException, ArchiveException {
try (CloseableConsumerAdapter c = new CloseableConsumerAdapter(closeableConsumer)) {
expand(c.track(new ArchiveStreamFactory().createArchiveInputStream(archive)),
targetDirectory);
}
}
/**
* Expands {@code archive} into {@code targetDirectory}.
*
* This method creates a wrapper around the archive stream
* which is never closed and thus leaks resources, please use
* {@link #expand(String,InputStream,File,CloseableConsumer)}
* instead.
*
* @param archive the file to expand
* @param targetDirectory the directory to write to
* @param format the archive format. This uses the same format as
* accepted by {@link ArchiveStreamFactory}.
* @throws IOException if an I/O error occurs
* @throws ArchiveException if the archive cannot be read for other reasons
* @deprecated this method leaks resources
*/
@Deprecated
public void expand(String format, InputStream archive, File targetDirectory)
throws IOException, ArchiveException {
expand(format, archive, targetDirectory, CloseableConsumer.NULL_CONSUMER);
}
/**
* Expands {@code archive} into {@code targetDirectory}.
*
* This method creates a wrapper around the archive stream and
* the caller of this method is responsible for closing it -
* probably at the same time as closing the stream itself. The
* caller is informed about the wrapper object via the {@code
* closeableConsumer} callback as soon as it is no longer needed
* by this class.
*
* @param archive the file to expand
* @param targetDirectory the directory to write to
* @param format the archive format. This uses the same format as
* accepted by {@link ArchiveStreamFactory}.
* @param closeableConsumer is informed about the stream wrapped around the passed in stream
* @throws IOException if an I/O error occurs
* @throws ArchiveException if the archive cannot be read for other reasons
* @since 1.19
*/
public void expand(String format, InputStream archive, File targetDirectory, CloseableConsumer closeableConsumer)
throws IOException, ArchiveException {
try (CloseableConsumerAdapter c = new CloseableConsumerAdapter(closeableConsumer)) {
expand(c.track(new ArchiveStreamFactory().createArchiveInputStream(format, archive)),
targetDirectory);
}
}
/**
* Expands {@code archive} into {@code targetDirectory}.
*
* This method creates a wrapper around the archive channel
* which is never closed and thus leaks resources, please use
* {@link #expand(String,SeekableByteChannel,File,CloseableConsumer)}
* instead.
*
* @param archive the file to expand
* @param targetDirectory the directory to write to
* @param format the archive format. This uses the same format as
* accepted by {@link ArchiveStreamFactory}.
* @throws IOException if an I/O error occurs
* @throws ArchiveException if the archive cannot be read for other reasons
* @deprecated this method leaks resources
*/
@Deprecated
public void expand(String format, SeekableByteChannel archive, File targetDirectory)
throws IOException, ArchiveException {
expand(format, archive, targetDirectory, CloseableConsumer.NULL_CONSUMER);
}
/**
* Expands {@code archive} into {@code targetDirectory}.
*
* This method creates a wrapper around the archive channel and
* the caller of this method is responsible for closing it -
* probably at the same time as closing the channel itself. The
* caller is informed about the wrapper object via the {@code
* closeableConsumer} callback as soon as it is no longer needed
* by this class.
*
* @param archive the file to expand
* @param targetDirectory the directory to write to
* @param format the archive format. This uses the same format as
* accepted by {@link ArchiveStreamFactory}.
* @param closeableConsumer is informed about the stream wrapped around the passed in channel
* @throws IOException if an I/O error occurs
* @throws ArchiveException if the archive cannot be read for other reasons
* @since 1.19
*/
public void expand(String format, SeekableByteChannel archive, File targetDirectory,
CloseableConsumer closeableConsumer)
throws IOException, ArchiveException {
try (CloseableConsumerAdapter c = new CloseableConsumerAdapter(closeableConsumer)) {
if (!prefersSeekableByteChannel(format)) {
expand(format, c.track(Channels.newInputStream(archive)), targetDirectory);
} else if (ArchiveStreamFactory.ZIP.equalsIgnoreCase(format)) {
expand(c.track(new ZipFile(archive)), targetDirectory);
} else if (ArchiveStreamFactory.SEVEN_Z.equalsIgnoreCase(format)) {
expand(c.track(new SevenZFile(archive)), targetDirectory);
} else {
// never reached as prefersSeekableByteChannel only returns true for ZIP and 7z
throw new ArchiveException("Don't know how to handle format " + format);
}
}
}
/**
* Expands {@code archive} into {@code targetDirectory}.
*
* @param archive the file to expand
* @param targetDirectory the directory to write to
* @throws IOException if an I/O error occurs
* @throws ArchiveException if the archive cannot be read for other reasons
*/
public void expand(final ArchiveInputStream archive, File targetDirectory)
throws IOException, ArchiveException {
expand(new ArchiveEntrySupplier() {
@Override
public ArchiveEntry getNextReadableEntry() throws IOException {
ArchiveEntry next = archive.getNextEntry();
while (next != null && !archive.canReadEntryData(next)) {
next = archive.getNextEntry();
}
return next;
}
}, new EntryWriter() {
@Override
public void writeEntryDataTo(ArchiveEntry entry, OutputStream out) throws IOException {
IOUtils.copy(archive, out);
}
}, targetDirectory);
}
/**
* Expands {@code archive} into {@code targetDirectory}.
*
* @param archive the file to expand
* @param targetDirectory the directory to write to
* @throws IOException if an I/O error occurs
* @throws ArchiveException if the archive cannot be read for other reasons
*/
public void expand(final ZipFile archive, File targetDirectory)
throws IOException, ArchiveException {
final Enumeration entries = archive.getEntries();
expand(new ArchiveEntrySupplier() {
@Override
public ArchiveEntry getNextReadableEntry() throws IOException {
ZipArchiveEntry next = entries.hasMoreElements() ? entries.nextElement() : null;
while (next != null && !archive.canReadEntryData(next)) {
next = entries.hasMoreElements() ? entries.nextElement() : null;
}
return next;
}
}, new EntryWriter() {
@Override
public void writeEntryDataTo(ArchiveEntry entry, OutputStream out) throws IOException {
try (InputStream in = archive.getInputStream((ZipArchiveEntry) entry)) {
IOUtils.copy(in, out);
}
}
}, targetDirectory);
}
/**
* Expands {@code archive} into {@code targetDirectory}.
*
* @param archive the file to expand
* @param targetDirectory the directory to write to
* @throws IOException if an I/O error occurs
* @throws ArchiveException if the archive cannot be read for other reasons
*/
public void expand(final SevenZFile archive, File targetDirectory)
throws IOException, ArchiveException {
expand(new ArchiveEntrySupplier() {
@Override
public ArchiveEntry getNextReadableEntry() throws IOException {
return archive.getNextEntry();
}
}, new EntryWriter() {
@Override
public void writeEntryDataTo(ArchiveEntry entry, OutputStream out) throws IOException {
final byte[] buffer = new byte[8024];
int n;
while (-1 != (n = archive.read(buffer))) {
out.write(buffer, 0, n);
}
}
}, targetDirectory);
}
private boolean prefersSeekableByteChannel(String format) {
return ArchiveStreamFactory.ZIP.equalsIgnoreCase(format) || ArchiveStreamFactory.SEVEN_Z.equalsIgnoreCase(format);
}
private void expand(ArchiveEntrySupplier supplier, EntryWriter writer, File targetDirectory)
throws IOException {
String targetDirPath = targetDirectory.getCanonicalPath();
if (!targetDirPath.endsWith(File.separator)) {
targetDirPath += File.separator;
}
ArchiveEntry nextEntry = supplier.getNextReadableEntry();
while (nextEntry != null) {
File f = new File(targetDirectory, nextEntry.getName());
if (!f.getCanonicalPath().startsWith(targetDirPath)) {
throw new IOException("Expanding " + nextEntry.getName()
+ " would create file outside of " + targetDirectory);
}
if (nextEntry.isDirectory()) {
if (!f.isDirectory() && !f.mkdirs()) {
throw new IOException("Failed to create directory " + f);
}
} else {
File parent = f.getParentFile();
if (!parent.isDirectory() && !parent.mkdirs()) {
throw new IOException("Failed to create directory " + parent);
}
try (OutputStream o = Files.newOutputStream(f.toPath())) {
writer.writeEntryDataTo(nextEntry, o);
}
}
nextEntry = supplier.getNextReadableEntry();
}
}
}