/*

 * Copyright (c) 2014, 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.

 */

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.RandomAccessFile;

import java.util.ArrayList;

import java.util.List;

import java.util.jar.JarEntry;

import java.util.jar.JarOutputStream;

/*

 * @test

 * @bug 8000650

 * @summary unpack200.exe should check gzip crc

 * @compile -XDignore.symbol.file Utils.java PackChecksum.java

 * @run main PackChecksum

 * @author kizune

 */

public class PackChecksum {

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

        testChecksum();

    }

    static void testChecksum() throws Exception {

        // Create a fresh .jar file

        File testFile = new File("src_tools.jar");

        File testPack = new File("src_tools.pack.gz");

        generateJar(testFile);

        List<String> cmdsList = new ArrayList<>();

        // Create .pack file

        cmdsList.add(Utils.getPack200Cmd());

        cmdsList.add(testPack.getName());

        cmdsList.add(testFile.getName());

        Utils.runExec(cmdsList);

        // Mess up with the checksum of the packed file

        RandomAccessFile raf = new RandomAccessFile(testPack, "rw");

        raf.seek(raf.length() - 8);

        int val = raf.readInt();

        val = Integer.MAX_VALUE - val;

        raf.seek(raf.length() - 8);

        raf.writeInt(val);

        raf.close();

        File dstFile = new File("dst_tools.jar");

        cmdsList.clear();

        cmdsList.add(Utils.getUnpack200Cmd());

        cmdsList.add(testPack.getName());

        cmdsList.add(dstFile.getName());

        boolean passed = false;

        try {

            Utils.runExec(cmdsList);

        } catch (RuntimeException re) {

            // unpack200 should exit with non-zero exit code

            passed = true;

        }

        // tidy up

        if (testFile.exists()) testFile.delete();

        if (testPack.exists()) testPack.delete();

        if (dstFile.exists()) dstFile.delete();

        if (!passed) {

            throw new Exception("File with incorrect CRC unpacked without the error.");

        }

    }

    static void generateJar(File result) throws IOException {

        if (result.exists()) {

            result.delete();

        }

        try (JarOutputStream output = new JarOutputStream(new FileOutputStream(result)); ) {

            for (int i = 0 ; i < 100 ; i++) {

                JarEntry e = new JarEntry("F-" + i + ".txt");

                output.putNextEntry(e);

            }

            output.flush();

            output.close();

        }

    }

}