/*

 * Copyright 2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

/**

 * @test

 * @bug 4879507

 * @summary ZipInputStream does not check CRC for stored (uncompressed) files

 * @author Dave Bristor

 */

import java.io.*;

import java.util.Arrays;

import java.util.zip.*;

public class StoredCRC {

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

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        ZipOutputStream zos = new ZipOutputStream(baos);

        ZipEntry ze = new ZipEntry("test");

        ze.setMethod(ZipOutputStream.STORED);

        String writtenString = "hello, world";

        byte[] writtenData = writtenString.getBytes("ASCII");

        ze.setSize(writtenData.length);

        CRC32 crc = new CRC32();

        crc.update(writtenData);

        ze.setCrc(crc.getValue());

        zos.putNextEntry(ze);

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

        zos.close();

        byte[] data = baos.toByteArray();

        // Run with an arg to create a test file that can be used to figure

        // out what position in the data stream can be changed.

        if (args.length > 0) {

            FileOutputStream fos = new FileOutputStream("stored.zip");

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

            fos.close();

        } else {

            // Test that reading byte-at-a-time works

            ZipInputStream zis = new ZipInputStream(

                new ByteArrayInputStream(data));

            ze = zis.getNextEntry();

            int pos = 0;

            byte[] readData = new byte[256];

            try {

                int count = zis.read(readData, pos, 1);

                while (count > 0) {

                    count = zis.read(readData, ++pos, 1);

                }

                check(writtenString.equals(new String(readData, 0, pos, "ASCII")));

            } catch (Throwable t) {

                unexpected(t);

            }

            // Test that data corruption is detected.  Offset 39 was

            // determined to be in the entry's uncompressed data.

            data[39] ^= 1;

            zis = new ZipInputStream(

                new ByteArrayInputStream(data));

            ze = zis.getNextEntry();

            try {

                zis.read(readData, 0, readData.length);

                fail("Did not catch expected ZipException" );

            } catch (ZipException ex) {

                String msg = ex.getMessage();

                check(msg != null && msg.startsWith("invalid entry CRC (expected 0x"));

            } catch (Throwable t) {

                unexpected(t);

            }

        }

    }

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

    static volatile int passed = 0, failed = 0;

    static boolean pass() {passed++; return true;}

    static boolean fail() {failed++; Thread.dumpStack(); return false;}

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

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

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

    static boolean equal(Object x, Object y) {

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

        else return 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");}

}