/*
 * 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 java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.Locale;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;

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;
import org.apache.commons.compress.utils.Lists;
import org.apache.commons.compress.utils.ServiceLoaderIterator;
import org.apache.commons.compress.utils.Sets;

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 = Files.newOutputStream(output.toPath());
ArchiveOutputStream os = new ArchiveStreamFactory().createArchiveOutputStream(ArchiveStreamFactory.ZIP, out);
os.putArchiveEntry(new ZipArchiveEntry("testdata/test1.xml"));
IOUtils.copy(Files.newInputStream(file1.toPath()), os);
os.closeArchiveEntry();
os.putArchiveEntry(new ZipArchiveEntry("testdata/test2.xml"));
IOUtils.copy(Files.newInputStream(file2.toPath()), os);
os.closeArchiveEntry();
os.close();

Decompressing a ZIP-File:
final InputStream is = Files.newInputStream(input.toPath());
ArchiveInputStream in = new ArchiveStreamFactory().createArchiveInputStream(ArchiveStreamFactory.ZIP, is);
ZipArchiveEntry entry = (ZipArchiveEntry)in.getNextEntry();
OutputStream out = Files.newOutputStream(dir.toPath().resolve(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/**
 * 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:
 *
 * <pre>
 * final OutputStream out = Files.newOutputStream(output.toPath());
 * ArchiveOutputStream os = new ArchiveStreamFactory().createArchiveOutputStream(ArchiveStreamFactory.ZIP, out);
 *
 * os.putArchiveEntry(new ZipArchiveEntry("testdata/test1.xml"));
 * IOUtils.copy(Files.newInputStream(file1.toPath()), os);
 * os.closeArchiveEntry();
 *
 * os.putArchiveEntry(new ZipArchiveEntry("testdata/test2.xml"));
 * IOUtils.copy(Files.newInputStream(file2.toPath()), os);
 * os.closeArchiveEntry();
 * os.close();
 * </pre>
 *
 * Decompressing a ZIP-File:
 *
 * <pre>
 * final InputStream is = Files.newInputStream(input.toPath());
 * ArchiveInputStream in = new ArchiveStreamFactory().createArchiveInputStream(ArchiveStreamFactory.ZIP, is);
 * ZipArchiveEntry entry = (ZipArchiveEntry)in.getNextEntry();
 * OutputStream out = Files.newOutputStream(dir.toPath().resolve(entry.getName()));
 * IOUtils.copy(in, out);
 * out.close();
 * in.close();
 * </pre>
 * @Immutable provided that the deprecated method setEntryEncoding is not used.
 * @ThreadSafe even if the deprecated method setEntryEncoding is used
 */
public class ArchiveStreamFactory implements ArchiveStreamProvider {

    private static final int TAR_HEADER_SIZE = 512;

    private static final int DUMP_SIGNATURE_SIZE = 32;

    private static final int SIGNATURE_SIZE = 12;

    private static final ArchiveStreamFactory SINGLETON = new ArchiveStreamFactory();

    
Constant (value "ar") used to identify the AR archive format. 
Since:
1.1/**
     * Constant (value {@value}) used to identify the AR archive format.
     * @since 1.1
     */
    public static final String AR = "ar";

    
Constant (value "arj") used to identify the ARJ archive format. Not supported as an output stream type. 
Since:
1.6/**
     * 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 "cpio") used to identify the CPIO archive format. 
Since:
1.1/**
     * Constant (value {@value}) used to identify the CPIO archive format.
     * @since 1.1
     */
    public static final String CPIO = "cpio";

    
Constant (value "dump") used to identify the Unix DUMP archive format. Not supported as an output stream type. 
Since:
1.3/**
     * 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 "jar") used to identify the JAR archive format. 
Since:
1.1/**
     * 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/**
     * Constant used to identify the TAR archive format.
     * @since 1.1
     */
    public static final String TAR = "tar";

    
Constant (value "zip") used to identify the ZIP archive format. 
Since:
1.1/**
     * Constant (value {@value}) used to identify the ZIP archive format.
     * @since 1.1
     */
    public static final String ZIP = "zip";

    
Constant (value "7z") used to identify the 7z archive format. 
Since:
1.8/**
     * 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.
/**
     * Entry encoding, null for the platform default.
     */
    private final String encoding;

    
Entry encoding, null for the default.
/**
     * Entry encoding, null for the default.
     */
    private volatile String entryEncoding;

    private SortedMap<String, ArchiveStreamProvider> archiveInputStreamProviders;

    private SortedMap<String, ArchiveStreamProvider> archiveOutputStreamProviders;

    private static ArrayList<ArchiveStreamProvider> findArchiveStreamProviders() {
        return Lists.newArrayList(serviceLoaderIterator());
    }

    static void putAll(Set<String> names, ArchiveStreamProvider provider,
            TreeMap<String, ArchiveStreamProvider> map) {
        for (String name : names) {
            map.put(toKey(name), provider);
        }
    }

    private static Iterator<ArchiveStreamProvider> serviceLoaderIterator() {
        return new ServiceLoaderIterator<>(ArchiveStreamProvider.class);
    }

    private static String toKey(final String name) {
        return name.toUpperCase(Locale.ROOT);
    }

    
Constructs a new sorted map from input stream provider names to provider
objects.

The map returned by this method will have one entry for each provider for
which support is available in the current Java virtual machine. If two or
more supported provider have the same name then the resulting map will
contain just one of them; which one it will contain is not specified.


The invocation of this method, and the subsequent use of the resulting
map, may cause time-consuming disk or network I/O operations to occur.
This method is provided for applications that need to enumerate all of
the available providers, for example to allow user provider selection.


This method may return different results at different times if new
providers are dynamically made available to the current Java virtual
machine.

Returns:
An immutable, map from names to provider objects
Since:
1.13/**
     * Constructs a new sorted map from input stream provider names to provider
     * objects.
     *
     * <p>
     * The map returned by this method will have one entry for each provider for
     * which support is available in the current Java virtual machine. If two or
     * more supported provider have the same name then the resulting map will
     * contain just one of them; which one it will contain is not specified.
     * </p>
     *
     * <p>
     * The invocation of this method, and the subsequent use of the resulting
     * map, may cause time-consuming disk or network I/O operations to occur.
     * This method is provided for applications that need to enumerate all of
     * the available providers, for example to allow user provider selection.
     * </p>
     *
     * <p>
     * This method may return different results at different times if new
     * providers are dynamically made available to the current Java virtual
     * machine.
     * </p>
     *
     * @return An immutable, map from names to provider objects
     * @since 1.13
     */
    public static SortedMap<String, ArchiveStreamProvider> findAvailableArchiveInputStreamProviders() {
        return AccessController.doPrivileged(new PrivilegedAction<SortedMap<String, ArchiveStreamProvider>>() {
            @Override
            public SortedMap<String, ArchiveStreamProvider> run() {
                TreeMap<String, ArchiveStreamProvider> map = new TreeMap<>();
                putAll(SINGLETON.getInputStreamArchiveNames(), SINGLETON, map);
                for (ArchiveStreamProvider provider : findArchiveStreamProviders()) {
                    putAll(provider.getInputStreamArchiveNames(), provider, map);
                }
                return map;
            }
        });
    }

    
Constructs a new sorted map from output stream provider names to provider
objects.

The map returned by this method will have one entry for each provider for
which support is available in the current Java virtual machine. If two or
more supported provider have the same name then the resulting map will
contain just one of them; which one it will contain is not specified.


The invocation of this method, and the subsequent use of the resulting
map, may cause time-consuming disk or network I/O operations to occur.
This method is provided for applications that need to enumerate all of
the available providers, for example to allow user provider selection.


This method may return different results at different times if new
providers are dynamically made available to the current Java virtual
machine.

Returns:
An immutable, map from names to provider objects
Since:
1.13/**
     * Constructs a new sorted map from output stream provider names to provider
     * objects.
     *
     * <p>
     * The map returned by this method will have one entry for each provider for
     * which support is available in the current Java virtual machine. If two or
     * more supported provider have the same name then the resulting map will
     * contain just one of them; which one it will contain is not specified.
     * </p>
     *
     * <p>
     * The invocation of this method, and the subsequent use of the resulting
     * map, may cause time-consuming disk or network I/O operations to occur.
     * This method is provided for applications that need to enumerate all of
     * the available providers, for example to allow user provider selection.
     * </p>
     *
     * <p>
     * This method may return different results at different times if new
     * providers are dynamically made available to the current Java virtual
     * machine.
     * </p>
     *
     * @return An immutable, map from names to provider objects
     * @since 1.13
     */
    public static SortedMap<String, ArchiveStreamProvider> findAvailableArchiveOutputStreamProviders() {
        return AccessController.doPrivileged(new PrivilegedAction<SortedMap<String, ArchiveStreamProvider>>() {
            @Override
            public SortedMap<String, ArchiveStreamProvider> run() {
                TreeMap<String, ArchiveStreamProvider> map = new TreeMap<>();
                putAll(SINGLETON.getOutputStreamArchiveNames(), SINGLETON, map);
                for (ArchiveStreamProvider provider : findArchiveStreamProviders()) {
                    putAll(provider.getOutputStreamArchiveNames(), provider, map);
                }
                return map;
            }
        });
    }

    
Create an instance using the platform default encoding.
/**
     * Create an instance using the platform default encoding.
     */
    public ArchiveStreamFactory() {
        this(null);
    }

    
Create an instance using the specified encoding.
Params:
encoding – the encoding to be used.
Since:
1.10/**
     * 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.
Returns:
entry encoding, or null for the archiver default
Since:
1.5/**
     * 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.
Params:
entryEncoding – the entry encoding, null uses the archiver default.
Throws:
IllegalStateException – if the constructor ArchiveStreamFactory(String) was used to specify the factory encoding.
Since:
1.5
Deprecated:
1.10 use ArchiveStreamFactory(String) to specify the encoding/**
     * 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;
    }

    
Creates an archive input stream from an archiver name and an input stream.
Params:
archiverName – the archive name, i.e. "ar", "arj", "zip", "tar", "jar", "cpio", "dump" or "7z"
in – the input stream
Throws:
ArchiveException – if the archiver name is not known
StreamingNotSupportedException – if the format cannot be
read from a stream
IllegalArgumentException – if the archiver name or stream is null
Returns:
the archive input stream/**
     * Creates 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 {
        return createArchiveInputStream(archiverName, in, entryEncoding);
    }

    @Override
    public ArchiveInputStream createArchiveInputStream(final String archiverName, final InputStream in,
            final String actualEncoding) 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 (actualEncoding != null) {
                return new ArjArchiveInputStream(in, actualEncoding);
            }
            return new ArjArchiveInputStream(in);
        }
        if (ZIP.equalsIgnoreCase(archiverName)) {
            if (actualEncoding != null) {
                return new ZipArchiveInputStream(in, actualEncoding);
            }
            return new ZipArchiveInputStream(in);
        }
        if (TAR.equalsIgnoreCase(archiverName)) {
            if (actualEncoding != null) {
                return new TarArchiveInputStream(in, actualEncoding);
            }
            return new TarArchiveInputStream(in);
        }
        if (JAR.equalsIgnoreCase(archiverName)) {
            if (actualEncoding != null) {
                return new JarArchiveInputStream(in, actualEncoding);
            }
            return new JarArchiveInputStream(in);
        }
        if (CPIO.equalsIgnoreCase(archiverName)) {
            if (actualEncoding != null) {
                return new CpioArchiveInputStream(in, actualEncoding);
            }
            return new CpioArchiveInputStream(in);
        }
        if (DUMP.equalsIgnoreCase(archiverName)) {
            if (actualEncoding != null) {
                return new DumpArchiveInputStream(in, actualEncoding);
            }
            return new DumpArchiveInputStream(in);
        }
        if (SEVEN_Z.equalsIgnoreCase(archiverName)) {
            throw new StreamingNotSupportedException(SEVEN_Z);
        }

        final ArchiveStreamProvider archiveStreamProvider = getArchiveInputStreamProviders().get(toKey(archiverName));
        if (archiveStreamProvider != null) {
            return archiveStreamProvider.createArchiveInputStream(archiverName, in, actualEncoding);
        }

        throw new ArchiveException("Archiver: " + archiverName + " not found.");
    }

    
Creates an archive output stream from an archiver name and an output stream.
Params:
archiverName – the archive name, i.e. "ar", "zip", "tar", "jar" or "cpio"
out – the output stream
Throws:
ArchiveException – if the archiver name is not known
StreamingNotSupportedException – if the format cannot be
written to a stream
IllegalArgumentException – if the archiver name or stream is null
Returns:
the archive output stream/**
     * Creates 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 {
        return createArchiveOutputStream(archiverName, out, entryEncoding);
    }

    @Override
    public ArchiveOutputStream createArchiveOutputStream(
            final String archiverName, final OutputStream out, final String actualEncoding)
            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 (actualEncoding != null) {
                zip.setEncoding(actualEncoding);
            }
            return zip;
        }
        if (TAR.equalsIgnoreCase(archiverName)) {
            if (actualEncoding != null) {
                return new TarArchiveOutputStream(out, actualEncoding);
            }
            return new TarArchiveOutputStream(out);
        }
        if (JAR.equalsIgnoreCase(archiverName)) {
            if (actualEncoding != null) {
                return new JarArchiveOutputStream(out, actualEncoding);
            }
            return new JarArchiveOutputStream(out);
        }
        if (CPIO.equalsIgnoreCase(archiverName)) {
            if (actualEncoding != null) {
                return new CpioArchiveOutputStream(out, actualEncoding);
            }
            return new CpioArchiveOutputStream(out);
        }
        if (SEVEN_Z.equalsIgnoreCase(archiverName)) {
            throw new StreamingNotSupportedException(SEVEN_Z);
        }

        final ArchiveStreamProvider archiveStreamProvider = getArchiveOutputStreamProviders().get(toKey(archiverName));
        if (archiveStreamProvider != null) {
            return archiveStreamProvider.createArchiveOutputStream(archiverName, out, actualEncoding);
        }

        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.
Params:
in – the input stream
Throws:
ArchiveException – if the archiver name is not known
StreamingNotSupportedException – if the format cannot be
read from a stream
IllegalArgumentException – if the stream is null or does not support mark
Returns:
the archive input stream/**
     * 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 {
        return createArchiveInputStream(detect(in), in);
    }

    
Try to determine the type of Archiver
Params:
in – input stream
Throws:
ArchiveException – if an archiver cannot be detected in the stream
Returns:
type of archiver if found
Since:
1.14/**
     * Try to determine the type of Archiver
     * @param in input stream
     * @return type of archiver if found
     * @throws ArchiveException if an archiver cannot be detected in the stream
     * @since 1.14
     */
    public static String detect(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[SIGNATURE_SIZE];
        in.mark(signature.length);
        int signatureLength = -1;
        try {
            signatureLength = IOUtils.readFully(in, signature);
            in.reset();
        } catch (IOException e) {
            throw new ArchiveException("IOException while reading signature.", e);
        }

        if (ZipArchiveInputStream.matches(signature, signatureLength)) {
            return ZIP;
        } else if (JarArchiveInputStream.matches(signature, signatureLength)) {
            return JAR;
        } else if (ArArchiveInputStream.matches(signature, signatureLength)) {
            return AR;
        } else if (CpioArchiveInputStream.matches(signature, signatureLength)) {
            return CPIO;
        } else if (ArjArchiveInputStream.matches(signature, signatureLength)) {
            return ARJ;
        } else if (SevenZFile.matches(signature, signatureLength)) {
            return SEVEN_Z;
        }

        // Dump needs a bigger buffer to check the signature;
        final byte[] dumpsig = new byte[DUMP_SIGNATURE_SIZE];
        in.mark(dumpsig.length);
        try {
            signatureLength = IOUtils.readFully(in, dumpsig);
            in.reset();
        } catch (IOException e) {
            throw new ArchiveException("IOException while reading dump signature", e);
        }
        if (DumpArchiveInputStream.matches(dumpsig, signatureLength)) {
            return DUMP;
        }

        // Tar needs an even bigger buffer to check the signature; read the first block
        final byte[] tarHeader = new byte[TAR_HEADER_SIZE];
        in.mark(tarHeader.length);
        try {
            signatureLength = IOUtils.readFully(in, tarHeader);
            in.reset();
        } catch (IOException e) {
            throw new ArchiveException("IOException while reading tar signature", e);
        }
        if (TarArchiveInputStream.matches(tarHeader, signatureLength)) {
            return TAR;
        }

        // COMPRESS-117 - improve auto-recognition
        if (signatureLength >= TAR_HEADER_SIZE) {
            TarArchiveInputStream tais = null;
            try {
                tais = new TarArchiveInputStream(new ByteArrayInputStream(tarHeader));
                // COMPRESS-191 - verify the header checksum
                if (tais.getNextTarEntry().isCheckSumOK()) {
                    return TAR;
                }
            } catch (final Exception e) { // NOPMD NOSONAR
                // can generate IllegalArgumentException as well
                // as IOException
                // autodetection, simply not a TAR
                // ignored
            } finally {
                IOUtils.closeQuietly(tais);
            }
        }
        throw new ArchiveException("No Archiver found for the stream signature");
    }

    public SortedMap<String, ArchiveStreamProvider> getArchiveInputStreamProviders() {
        if (archiveInputStreamProviders == null) {
            archiveInputStreamProviders = Collections
                    .unmodifiableSortedMap(findAvailableArchiveInputStreamProviders());
        }
        return archiveInputStreamProviders;
    }

    public SortedMap<String, ArchiveStreamProvider> getArchiveOutputStreamProviders() {
        if (archiveOutputStreamProviders == null) {
            archiveOutputStreamProviders = Collections
                    .unmodifiableSortedMap(findAvailableArchiveOutputStreamProviders());
        }
        return archiveOutputStreamProviders;
    }

    @Override
    public Set<String> getInputStreamArchiveNames() {
        return Sets.newHashSet(AR, ARJ, ZIP, TAR, JAR, CPIO, DUMP, SEVEN_Z);
    }

    @Override
    public Set<String> getOutputStreamArchiveNames() {
        return Sets.newHashSet(AR, ZIP, TAR, JAR, CPIO, SEVEN_Z);
    }

}