/*

 * 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.nio.*;

import java.util.*;

import java.util.zip.*;

public class LargeZipFile {

    // If true, don't delete large ZIP file created for test.

    static final boolean debug = System.getProperty("debug") != null;

    static final int DATA_LEN = 1024 * 1024;

    static final int DATA_SIZE = 8;

    static long fileSize = 3L * 1024L * 1024L * 1024L; // 3GB

    static boolean userFile = false;

    static byte[] data;

    static File largeFile;

    static String lastEntryName;

    /* args can be empty, in which case check a 3 GB file which is created for

     * this test (and then deleted).  Or it can be a number, in which case

     * that designates the size of the file that's created for this test (and

     * then deleted).  Or it can be the name of a file to use for the test, in

     * which case it is *not* deleted.  Note that in this last case, the data

     * comparison might fail.

     */

    static void realMain (String[] args) throws Throwable {

        if (args.length > 0) {

            try {

                fileSize = Long.parseLong(args[0]);

                System.out.println("Testing with file of size " + fileSize);

            } catch (NumberFormatException ex) {

                largeFile = new File(args[0]);

                if (!largeFile.exists()) {

                    throw new Exception("Specified file " + args[0] + " does not exist");

                }

                userFile = true;

                System.out.println("Testing with user-provided file " + largeFile);

            }

        }

        File testDir = null;

        if (largeFile == null) {

            testDir = new File(System.getProperty("test.scratch", "."),

                                    "LargeZip");

            if (testDir.exists()) {

                if (!testDir.delete()) {

                    throw new Exception("Cannot delete already-existing test directory");

                }

            }

            check(!testDir.exists() && testDir.mkdirs());

            largeFile = new File(testDir, "largezip.zip");

            createLargeZip();

        }

        readLargeZip();

        if (!userFile && !debug) {

            check(largeFile.delete());

            check(testDir.delete());

        }

    }

    static void createLargeZip() throws Throwable {

        int iterations = DATA_LEN / DATA_SIZE;

        ByteBuffer bb = ByteBuffer.allocate(DATA_SIZE);

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

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

            bb.putDouble(0, Math.random());

            baos.write(bb.array(), 0, DATA_SIZE);

        }

        data = baos.toByteArray();

        try (FileOutputStream fos = new FileOutputStream(largeFile);

             BufferedOutputStream bos = new BufferedOutputStream(fos);

             ZipOutputStream zos = new ZipOutputStream(bos))

        {

            long length = 0;

            while (length < fileSize) {

                ZipEntry ze = new ZipEntry("entry-" + length);

                lastEntryName = ze.getName();

                zos.putNextEntry(ze);

                zos.write(data, 0, data.length);

                zos.closeEntry();

                length = largeFile.length();

            }

            System.out.println("Last entry written is " + lastEntryName);

        }

    }

    static void readLargeZip() throws Throwable {

        try (ZipFile zipFile = new ZipFile(largeFile)) {

            ZipEntry entry = null;

            String entryName = null;

            int count = 0;

            Enumeration<? extends ZipEntry> entries = zipFile.entries();

            while (entries.hasMoreElements()) {

                entry = entries.nextElement();

                entryName = entry.getName();

                count++;

            }

            System.out.println("Number of entries read: " + count);

            System.out.println("Last entry read is " + entryName);

            check(!entry.isDirectory());

            if (check(entryName.equals(lastEntryName))) {

                ByteArrayOutputStream baos = new ByteArrayOutputStream();

                InputStream is = zipFile.getInputStream(entry);

                byte buf[] = new byte[4096];

                int len;

                while ((len = is.read(buf)) >= 0) {

                    baos.write(buf, 0, len);

                }

                baos.close();

                is.close();

                check(Arrays.equals(data, baos.toByteArray()));

            }

        }

    }

    //--------------------- Infrastructure ---------------------------

    static volatile int passed = 0, failed = 0;

    static void pass() {passed++;}

    static void pass(String msg) {System.out.println(msg); passed++;}

    static void fail() {failed++; Thread.dumpStack();}

    static void fail(String msg) {System.out.println(msg); fail();}

    static void unexpected(Throwable t) {failed++; t.printStackTrace();}

    static void unexpected(Throwable t, String msg) {

        System.out.println(msg); failed++; t.printStackTrace();}

    static boolean check(boolean cond) {if (cond) pass(); else fail(); return cond;}

    static void equal(Object x, Object y) {

        if (x == null ? y == null : x.equals(y)) pass();

        else fail(x + " not equal to " + y);}

    public static void main(String[] args) throws Throwable {

        try {realMain(args);} catch (Throwable t) {unexpected(t);}

        System.out.println("\nPassed = " + passed + " failed = " + failed);

        if (failed > 0) throw new AssertionError("Some tests failed");}

}