org.apache.commons.compress.archivers.examples.Expander Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* 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
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* 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 java.util.Iterator;
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.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarFile;
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(final File archive, final File targetDirectory) throws IOException, ArchiveException {
String format = null;
try (InputStream i = new BufferedInputStream(Files.newInputStream(archive.toPath()))) {
format = 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(final String format, final File archive, final 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(final InputStream archive, final 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(final InputStream archive, final File targetDirectory, final CloseableConsumer closeableConsumer)
throws IOException, ArchiveException {
try (CloseableConsumerAdapter c = new CloseableConsumerAdapter(closeableConsumer)) {
expand(c.track(ArchiveStreamFactory.DEFAULT.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(final String format, final InputStream archive, final 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(final String format, final InputStream archive, final File targetDirectory, final CloseableConsumer closeableConsumer)
throws IOException, ArchiveException {
try (CloseableConsumerAdapter c = new CloseableConsumerAdapter(closeableConsumer)) {
expand(c.track(ArchiveStreamFactory.DEFAULT.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(final String format, final SeekableByteChannel archive, final 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(final String format, final SeekableByteChannel archive, final File targetDirectory,
final 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.TAR.equalsIgnoreCase(format)) {
expand(c.track(new TarFile(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 TAR, 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, final File targetDirectory)
throws IOException, ArchiveException {
expand(() -> {
ArchiveEntry next = archive.getNextEntry();
while (next != null && !archive.canReadEntryData(next)) {
next = archive.getNextEntry();
}
return next;
}, (entry, out) -> 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
* @since 1.21
*/
public void expand(final TarFile archive, final File targetDirectory)
throws IOException, ArchiveException {
final Iterator entryIterator = archive.getEntries().iterator();
expand(() -> entryIterator.hasNext() ? entryIterator.next() : null,
(entry, out) -> {
try (InputStream in = archive.getInputStream((TarArchiveEntry) 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 ZipFile archive, final File targetDirectory)
throws IOException, ArchiveException {
final Enumeration entries = archive.getEntries();
expand(() -> {
ZipArchiveEntry next = entries.hasMoreElements() ? entries.nextElement() : null;
while (next != null && !archive.canReadEntryData(next)) {
next = entries.hasMoreElements() ? entries.nextElement() : null;
}
return next;
}, (entry, out) -> {
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, final File targetDirectory)
throws IOException, ArchiveException {
expand(archive::getNextEntry, (entry, out) -> {
final byte[] buffer = new byte[8192];
int n;
while (-1 != (n = archive.read(buffer))) {
out.write(buffer, 0, n);
}
}, targetDirectory);
}
private boolean prefersSeekableByteChannel(final String format) {
return ArchiveStreamFactory.TAR.equalsIgnoreCase(format)
|| ArchiveStreamFactory.ZIP.equalsIgnoreCase(format)
|| ArchiveStreamFactory.SEVEN_Z.equalsIgnoreCase(format);
}
private void expand(final ArchiveEntrySupplier supplier, final EntryWriter writer, final File targetDirectory)
throws IOException {
String targetDirPath = targetDirectory.getCanonicalPath();
if (!targetDirPath.endsWith(File.separator)) {
targetDirPath += File.separator;
}
ArchiveEntry nextEntry = supplier.getNextReadableEntry();
while (nextEntry != null) {
final 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 {
final 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();
}
}
}
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