/*

 * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/**

 * A simple class to create our erring Jar with a very long Main-Class

 * attribute in the manifest.

 */

import java.io.ByteArrayOutputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.PrintStream;

import java.util.zip.CRC32;

import java.util.zip.CheckedOutputStream;

import java.util.zip.ZipEntry;

import java.util.zip.ZipOutputStream;

public class ZipMeUp {

    static final CRC32 crc = new CRC32();

    private static String SOME_KLASS = ".Some";

    static byte[] getManifestAsBytes(int nchars) throws IOException {

        crc.reset();

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        CheckedOutputStream cos = new CheckedOutputStream(baos, crc);

        PrintStream ps = new PrintStream(cos);

        ps.println("Manifest-Version: 1.0");

        ps.print("Main-Class: ");

        for (int i = 0 ; i < nchars - SOME_KLASS.length() ; i++) {

            ps.print(i%10);

        }

        ps.println(SOME_KLASS);

        cos.flush();

        cos.close();

        ps.close();

        return baos.toByteArray();

    }

    /**

     * The arguments are: filename_to_create length

     * @param args

     * @throws java.lang.Exception

     */

    public static void main(String...args) throws Exception  {

        FileOutputStream fos = new FileOutputStream(args[0]);

        ZipOutputStream zos = new ZipOutputStream(fos);

        byte[] manifest = getManifestAsBytes(Integer.parseInt(args[1]));

        ZipEntry ze = new ZipEntry("META-INF/MANIFEST.MF");

        ze.setMethod(ZipEntry.STORED);

        ze.setSize(manifest.length);

        ze.setCompressedSize(manifest.length);

        ze.setCrc(crc.getValue());

        ze.setTime(System.currentTimeMillis());

        zos.putNextEntry(ze);

        zos.write(manifest);

        zos.flush();

        // add a zero length class

        ze = new ZipEntry(SOME_KLASS + ".class");

        ze.setMethod(ZipEntry.STORED);

        ze.setSize(0);

        ze.setCompressedSize(0);

        ze.setCrc(0);

        ze.setTime(System.currentTimeMillis());

        zos.putNextEntry(ze);

        zos.flush();

        zos.closeEntry();

        zos.close();

        System.exit(0);

    }

}