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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;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.commons.compress.archivers.ar.ArArchiveInputStream;
import org.apache.commons.compress.archivers.ar.ArArchiveOutputStream;
import org.apache.commons.compress.archivers.arj.ArjArchiveInputStream;
import org.apache.commons.compress.archivers.cpio.CpioArchiveInputStream;
import org.apache.commons.compress.archivers.cpio.CpioArchiveOutputStream;
import org.apache.commons.compress.archivers.dump.DumpArchiveInputStream;
import org.apache.commons.compress.archivers.jar.JarArchiveInputStream;
import org.apache.commons.compress.archivers.jar.JarArchiveOutputStream;
import org.apache.commons.compress.archivers.sevenz.SevenZFile;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
import org.apache.commons.compress.archivers.tar.TarArchiveOutputStream;
import org.apache.commons.compress.archivers.zip.ZipArchiveInputStream;
import org.apache.commons.compress.archivers.zip.ZipArchiveOutputStream;
import org.apache.commons.compress.utils.IOUtils;
/**
* Factory to create Archive[In|Out]putStreams from names or the first bytes of
* the InputStream. In order to add other implementations, you should extend
* ArchiveStreamFactory and override the appropriate methods (and call their
* implementation from super of course).
*
* Compressing a ZIP-File:
*
*
* final OutputStream out = new FileOutputStream(output);
* ArchiveOutputStream os = new ArchiveStreamFactory().createArchiveOutputStream(ArchiveStreamFactory.ZIP, out);
*
* os.putArchiveEntry(new ZipArchiveEntry("testdata/test1.xml"));
* IOUtils.copy(new FileInputStream(file1), os);
* os.closeArchiveEntry();
*
* os.putArchiveEntry(new ZipArchiveEntry("testdata/test2.xml"));
* IOUtils.copy(new FileInputStream(file2), os);
* os.closeArchiveEntry();
* os.close();
*
*
* Decompressing a ZIP-File:
*
*
* final InputStream is = new FileInputStream(input);
* ArchiveInputStream in = new ArchiveStreamFactory().createArchiveInputStream(ArchiveStreamFactory.ZIP, is);
* ZipArchiveEntry entry = (ZipArchiveEntry)in.getNextEntry();
* OutputStream out = new FileOutputStream(new File(dir, entry.getName()));
* IOUtils.copy(in, out);
* out.close();
* in.close();
*
* @Immutable provided that the deprecated method setEntryEncoding is not used.
* @ThreadSafe even if the deprecated method setEntryEncoding is used
*/
public class ArchiveStreamFactory {
/**
* Constant (value {@value}) used to identify the AR archive format.
* @since 1.1
*/
public static final String AR = "ar";
/**
* Constant (value {@value}) used to identify the ARJ archive format.
* Not supported as an output stream type.
* @since 1.6
*/
public static final String ARJ = "arj";
/**
* Constant (value {@value}) used to identify the CPIO archive format.
* @since 1.1
*/
public static final String CPIO = "cpio";
/**
* Constant (value {@value}) used to identify the Unix DUMP archive format.
* Not supported as an output stream type.
* @since 1.3
*/
public static final String DUMP = "dump";
/**
* Constant (value {@value}) used to identify the JAR archive format.
* @since 1.1
*/
public static final String JAR = "jar";
/**
* Constant used to identify the TAR archive format.
* @since 1.1
*/
public static final String TAR = "tar";
/**
* Constant (value {@value}) used to identify the ZIP archive format.
* @since 1.1
*/
public static final String ZIP = "zip";
/**
* Constant (value {@value}) used to identify the 7z archive format.
* @since 1.8
*/
public static final String SEVEN_Z = "7z";
/**
* Entry encoding, null for the platform default.
*/
private final String encoding;
/**
* Entry encoding, null for the default.
*/
private volatile String entryEncoding = null;
/**
* Create an instance using the platform default encoding.
*/
public ArchiveStreamFactory() {
this(null);
}
/**
* Create an instance using the specified encoding.
*
* @param encoding the encoding to be used.
*
* @since 1.10
*/
public ArchiveStreamFactory(final String encoding) {
super();
this.encoding = encoding;
// Also set the original field so can continue to use it.
this.entryEncoding = encoding;
}
/**
* Returns the encoding to use for arj, jar, zip, dump, cpio and tar
* files, or null for the archiver default.
*
* @return entry encoding, or null for the archiver default
* @since 1.5
*/
public String getEntryEncoding() {
return entryEncoding;
}
/**
* Sets the encoding to use for arj, jar, zip, dump, cpio and tar files. Use null for the archiver default.
*
* @param entryEncoding the entry encoding, null uses the archiver default.
* @since 1.5
* @deprecated 1.10 use {@link #ArchiveStreamFactory(String)} to specify the encoding
* @throws IllegalStateException if the constructor {@link #ArchiveStreamFactory(String)}
* was used to specify the factory encoding.
*/
@Deprecated
public void setEntryEncoding(final String entryEncoding) {
// Note: this does not detect new ArchiveStreamFactory(null) but that does not set the encoding anyway
if (encoding != null) {
throw new IllegalStateException("Cannot overide encoding set by the constructor");
}
this.entryEncoding = entryEncoding;
}
/**
* Create an archive input stream from an archiver name and an input stream.
*
* @param archiverName the archive name,
* i.e. {@value #AR}, {@value #ARJ}, {@value #ZIP}, {@value #TAR}, {@value #JAR}, {@value #CPIO}, {@value #DUMP} or {@value #SEVEN_Z}
* @param in the input stream
* @return the archive input stream
* @throws ArchiveException if the archiver name is not known
* @throws StreamingNotSupportedException if the format cannot be
* read from a stream
* @throws IllegalArgumentException if the archiver name or stream is null
*/
public ArchiveInputStream createArchiveInputStream(
final String archiverName, final InputStream in)
throws ArchiveException {
if (archiverName == null) {
throw new IllegalArgumentException("Archivername must not be null.");
}
if (in == null) {
throw new IllegalArgumentException("InputStream must not be null.");
}
if (AR.equalsIgnoreCase(archiverName)) {
return new ArArchiveInputStream(in);
}
if (ARJ.equalsIgnoreCase(archiverName)) {
if (entryEncoding != null) {
return new ArjArchiveInputStream(in, entryEncoding);
}
return new ArjArchiveInputStream(in);
}
if (ZIP.equalsIgnoreCase(archiverName)) {
if (entryEncoding != null) {
return new ZipArchiveInputStream(in, entryEncoding);
}
return new ZipArchiveInputStream(in);
}
if (TAR.equalsIgnoreCase(archiverName)) {
if (entryEncoding != null) {
return new TarArchiveInputStream(in, entryEncoding);
}
return new TarArchiveInputStream(in);
}
if (JAR.equalsIgnoreCase(archiverName)) {
if (entryEncoding != null) {
return new JarArchiveInputStream(in, entryEncoding);
}
return new JarArchiveInputStream(in);
}
if (CPIO.equalsIgnoreCase(archiverName)) {
if (entryEncoding != null) {
return new CpioArchiveInputStream(in, entryEncoding);
}
return new CpioArchiveInputStream(in);
}
if (DUMP.equalsIgnoreCase(archiverName)) {
if (entryEncoding != null) {
return new DumpArchiveInputStream(in, entryEncoding);
}
return new DumpArchiveInputStream(in);
}
if (SEVEN_Z.equalsIgnoreCase(archiverName)) {
throw new StreamingNotSupportedException(SEVEN_Z);
}
throw new ArchiveException("Archiver: " + archiverName + " not found.");
}
/**
* Create an archive output stream from an archiver name and an output stream.
*
* @param archiverName the archive name,
* i.e. {@value #AR}, {@value #ZIP}, {@value #TAR}, {@value #JAR} or {@value #CPIO}
* @param out the output stream
* @return the archive output stream
* @throws ArchiveException if the archiver name is not known
* @throws StreamingNotSupportedException if the format cannot be
* written to a stream
* @throws IllegalArgumentException if the archiver name or stream is null
*/
public ArchiveOutputStream createArchiveOutputStream(
final String archiverName, final OutputStream out)
throws ArchiveException {
if (archiverName == null) {
throw new IllegalArgumentException("Archivername must not be null.");
}
if (out == null) {
throw new IllegalArgumentException("OutputStream must not be null.");
}
if (AR.equalsIgnoreCase(archiverName)) {
return new ArArchiveOutputStream(out);
}
if (ZIP.equalsIgnoreCase(archiverName)) {
final ZipArchiveOutputStream zip = new ZipArchiveOutputStream(out);
if (entryEncoding != null) {
zip.setEncoding(entryEncoding);
}
return zip;
}
if (TAR.equalsIgnoreCase(archiverName)) {
if (entryEncoding != null) {
return new TarArchiveOutputStream(out, entryEncoding);
}
return new TarArchiveOutputStream(out);
}
if (JAR.equalsIgnoreCase(archiverName)) {
if (entryEncoding != null) {
return new JarArchiveOutputStream(out, entryEncoding);
}
return new JarArchiveOutputStream(out);
}
if (CPIO.equalsIgnoreCase(archiverName)) {
if (entryEncoding != null) {
return new CpioArchiveOutputStream(out, entryEncoding);
}
return new CpioArchiveOutputStream(out);
}
if (SEVEN_Z.equalsIgnoreCase(archiverName)) {
throw new StreamingNotSupportedException(SEVEN_Z);
}
throw new ArchiveException("Archiver: " + archiverName + " not found.");
}
/**
* Create an archive input stream from an input stream, autodetecting
* the archive type from the first few bytes of the stream. The InputStream
* must support marks, like BufferedInputStream.
*
* @param in the input stream
* @return the archive input stream
* @throws ArchiveException if the archiver name is not known
* @throws StreamingNotSupportedException if the format cannot be
* read from a stream
* @throws IllegalArgumentException if the stream is null or does not support mark
*/
public ArchiveInputStream createArchiveInputStream(final InputStream in)
throws ArchiveException {
if (in == null) {
throw new IllegalArgumentException("Stream must not be null.");
}
if (!in.markSupported()) {
throw new IllegalArgumentException("Mark is not supported.");
}
final byte[] signature = new byte[12];
in.mark(signature.length);
try {
int signatureLength = IOUtils.readFully(in, signature);
in.reset();
if (ZipArchiveInputStream.matches(signature, signatureLength)) {
return createArchiveInputStream(ZIP, in);
} else if (JarArchiveInputStream.matches(signature, signatureLength)) {
return createArchiveInputStream(JAR, in);
} else if (ArArchiveInputStream.matches(signature, signatureLength)) {
return createArchiveInputStream(AR, in);
} else if (CpioArchiveInputStream.matches(signature, signatureLength)) {
return createArchiveInputStream(CPIO, in);
} else if (ArjArchiveInputStream.matches(signature, signatureLength)) {
return createArchiveInputStream(ARJ, in);
} else if (SevenZFile.matches(signature, signatureLength)) {
throw new StreamingNotSupportedException(SEVEN_Z);
}
// Dump needs a bigger buffer to check the signature;
final byte[] dumpsig = new byte[32];
in.mark(dumpsig.length);
signatureLength = IOUtils.readFully(in, dumpsig);
in.reset();
if (DumpArchiveInputStream.matches(dumpsig, signatureLength)) {
return createArchiveInputStream(DUMP, in);
}
// Tar needs an even bigger buffer to check the signature; read the first block
final byte[] tarheader = new byte[512];
in.mark(tarheader.length);
signatureLength = IOUtils.readFully(in, tarheader);
in.reset();
if (TarArchiveInputStream.matches(tarheader, signatureLength)) {
return createArchiveInputStream(TAR, in);
}
// COMPRESS-117 - improve auto-recognition
if (signatureLength >= 512) {
TarArchiveInputStream tais = null;
try {
tais = new TarArchiveInputStream(new ByteArrayInputStream(tarheader));
// COMPRESS-191 - verify the header checksum
if (tais.getNextTarEntry().isCheckSumOK()) {
return createArchiveInputStream(TAR, in);
}
} catch (final Exception e) { // NOPMD
// can generate IllegalArgumentException as well
// as IOException
// autodetection, simply not a TAR
// ignored
} finally {
IOUtils.closeQuietly(tais);
}
}
} catch (final IOException e) {
throw new ArchiveException("Could not use reset and mark operations.", e);
}
throw new ArchiveException("No Archiver found for the stream signature");
}
}