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Apache Commons Compress 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.

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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.commons.compress.archivers.jar;

import java.io.IOException;
import java.io.OutputStream;

import org.apache.commons.compress.archivers.ArchiveEntry;
import org.apache.commons.compress.archivers.zip.JarMarker;
import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
import org.apache.commons.compress.archivers.zip.ZipArchiveOutputStream;

/**
 * Subclass that adds a special extra field to the very first entry
 * which allows the created archive to be used as an executable jar on
 * Solaris.
 *
 * @NotThreadSafe
 */
public class JarArchiveOutputStream extends ZipArchiveOutputStream {

    private boolean jarMarkerAdded = false;

    public JarArchiveOutputStream(final OutputStream out) {
        super(out);
    }

    /**
     * Create and instance that wraps the output stream using the provided encoding.
     *
     * @param out the output stream to wrap
     * @param encoding the encoding to use. Use null for the platform default.
     * @since 1.10
     */
    public JarArchiveOutputStream(final OutputStream out, final String encoding) {
        super(out);
        setEncoding(encoding);
    }

    // @throws ClassCastException if entry is not an instance of ZipArchiveEntry
    @Override
    public void putArchiveEntry(final ArchiveEntry ze) throws IOException {
        if (!jarMarkerAdded) {
            ((ZipArchiveEntry)ze).addAsFirstExtraField(JarMarker.getInstance());
            jarMarkerAdded = true;
        }
        super.putArchiveEntry(ze);
    }
}