/*

 * 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.*;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Enumeration;

import java.util.List;

import java.util.jar.JarEntry;

import java.util.jar.JarFile;

import java.util.jar.JarInputStream;

import java.util.jar.JarOutputStream;

import java.util.zip.ZipEntry;

/*

 * @test

 * @bug 8029646

 * @summary tests that native unpacker produces the same result as Java one

 * @compile -XDignore.symbol.file Utils.java PackTestZip64.java

 * @run main PackTestZip64

 * @author kizune

 */

public class PackTestZip64 {

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

        testPacking();

        Utils.cleanup();

    }

    // 1KB buffer is enough to copy jar content

    private static final byte[] BUFFER = new byte[1024];

    static void testPacking() throws IOException {

        // make a copy of the test specimen to local directory

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

        // Add a large number of small files to the golden jar

        generateLargeJar(testFile, Utils.locateJar("golden.jar"));

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

        // Repack file to get the Java-based result

        cmdsList.add(Utils.getPack200Cmd());

        cmdsList.add("--repack");

        cmdsList.add(testFile.getName());

        Utils.runExec(cmdsList);

        cmdsList.clear();

        // Pack file with pack200 and unpack in with unpack200

        File packedFile = new File("tools.pack.gz");

        cmdsList.add(Utils.getPack200Cmd());

        cmdsList.add(packedFile.getName());

        cmdsList.add(testFile.getName());

        Utils.runExec(cmdsList);

        cmdsList.clear();

        File unpackedFile = new File("tools_native.jar");

        cmdsList.add(Utils.getUnpack200Cmd());

        cmdsList.add(packedFile.getName());

        cmdsList.add(unpackedFile.getName());

        Utils.runExec(cmdsList);

        // Compare files binary

        compareTwoFiles(testFile, unpackedFile);

        // Cleaning up generated files

        testFile.delete();

        packedFile.delete();

        unpackedFile.delete();

    }

    static void compareTwoFiles(File src, File dst) throws IOException {

        if (!src.exists()) {

            throw new IOException("File " + src.getName() + " does not exist!");

        }

        if(!dst.exists()) {

            throw new IOException("File " + dst.getName() + " does not exist!");

        }

        BufferedInputStream srcis, dstis;

        srcis = new BufferedInputStream(new FileInputStream(src));

        dstis = new BufferedInputStream(new FileInputStream(dst));

        int s = 0, d, pos = 0;

        while (s != -1) { // Checking of just one result for EOF is enough

            s = srcis.read();

            d = dstis.read();

            if (s != d) {

                throw new IOException("Files are differ starting at position: "

                + Integer.toHexString(pos));

            }

            pos++;

        }

        srcis.close();

        dstis.close();

    }

    static void generateLargeJar(File result, File source) throws IOException {

        if (result.exists()) {

            result.delete();

        }

        try (JarOutputStream copyTo = new JarOutputStream(new FileOutputStream(result));

             JarFile srcJar = new JarFile(source)) {

            for (JarEntry je : Collections.list(srcJar.entries())) {

                copyTo.putNextEntry(je);

                if (!je.isDirectory()) {

                    copyStream(srcJar.getInputStream(je), copyTo);

                }

                copyTo.closeEntry();

            }

            int many = Short.MAX_VALUE * 2 + 2;

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

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

                copyTo.putNextEntry(e);

            }

            copyTo.flush();

            copyTo.close();

        }

    }

    static void copyStream(InputStream in, OutputStream out) throws IOException {

        int bytesRead;

        while ((bytesRead = in.read(BUFFER))!= -1) {

            out.write(BUFFER, 0, bytesRead);

        }

    }

}