/*

 * 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.

 */

/* @test

 * @bug 4770745 6218846 6218848 6237956

 * @summary test for correct detection and reporting of corrupted zip files

 * @author Martin Buchholz

 */

import java.util.*;

import java.util.zip.*;

import java.io.*;

import static java.lang.System.*;

import static java.util.zip.ZipFile.*;

public class CorruptedZipFiles {

    static int passed = 0, failed = 0;

    static void fail(String msg) {

        failed++;

        err.println(msg);

    }

    static void unexpected(Throwable t) {

        failed++;

        t.printStackTrace();

    }

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

        try (FileOutputStream fos = new FileOutputStream("x.zip");

             ZipOutputStream zos = new ZipOutputStream(fos))

        {

            ZipEntry e = new ZipEntry("x");

            zos.putNextEntry(e);

            zos.write((int)'x');

        }

        int len = (int)(new File("x.zip").length());

        byte[] good = new byte[len];

        try (FileInputStream fis = new FileInputStream("x.zip")) {

            fis.read(good);

        }

        new File("x.zip").delete();

        int endpos = len - ENDHDR;

        int cenpos = u16(good, endpos+ENDOFF);

        int locpos = u16(good, cenpos+CENOFF);

        if (u32(good, endpos) != ENDSIG) fail("Where's ENDSIG?");

        if (u32(good, cenpos) != CENSIG) fail("Where's CENSIG?");

        if (u32(good, locpos) != LOCSIG) fail("Where's LOCSIG?");

        if (u16(good, locpos+LOCNAM) != u16(good,cenpos+CENNAM))

            fail("Name field length mismatch");

        if (u16(good, locpos+LOCEXT) != u16(good,cenpos+CENEXT))

            fail("Extra field length mismatch");

        byte[] bad;

        err.println("corrupted ENDSIZ");

        bad = good.clone();

        bad[endpos+ENDSIZ]=(byte)0xff;

        checkZipException(bad, ".*bad central directory size.*");

        err.println("corrupted ENDOFF");

        bad = good.clone();

        bad[endpos+ENDOFF]=(byte)0xff;

        checkZipException(bad, ".*bad central directory offset.*");

        err.println("corrupted CENSIG");

        bad = good.clone();

        bad[cenpos]++;

        checkZipException(bad, ".*bad signature.*");

        err.println("corrupted CENFLG");

        bad = good.clone();

        bad[cenpos+CENFLG] |= 1;

        checkZipException(bad, ".*encrypted entry.*");

        err.println("corrupted CENNAM 1");

        bad = good.clone();

        bad[cenpos+CENNAM]++;

        checkZipException(bad, ".*bad header size.*");

        err.println("corrupted CENNAM 2");

        bad = good.clone();

        bad[cenpos+CENNAM]--;

        checkZipException(bad, ".*bad header size.*");

        err.println("corrupted CENNAM 3");

        bad = good.clone();

        bad[cenpos+CENNAM]   = (byte)0xfd;

        bad[cenpos+CENNAM+1] = (byte)0xfd;

        checkZipException(bad, ".*bad header size.*");

        err.println("corrupted CENEXT 1");

        bad = good.clone();

        bad[cenpos+CENEXT]++;

        checkZipException(bad, ".*bad header size.*");

        err.println("corrupted CENEXT 2");

        bad = good.clone();

        bad[cenpos+CENEXT]   = (byte)0xfd;

        bad[cenpos+CENEXT+1] = (byte)0xfd;

        checkZipException(bad, ".*bad header size.*");

        err.println("corrupted CENCOM");

        bad = good.clone();

        bad[cenpos+CENCOM]++;

        checkZipException(bad, ".*bad header size.*");

        err.println("corrupted CENHOW");

        bad = good.clone();

        bad[cenpos+CENHOW] = 2;

        checkZipException(bad, ".*bad compression method.*");

        err.println("corrupted LOCSIG");

        bad = good.clone();

        bad[locpos]++;

        checkZipExceptionInGetInputStream(bad, ".*bad signature.*");

        out.printf("passed = %d, failed = %d%n", passed, failed);

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

    }

    static int uniquifier = 432;

    static void checkZipExceptionImpl(byte[] data,

                                      String msgPattern,

                                      boolean getInputStream) {

        String zipName = "bad" + (uniquifier++) + ".zip";

        try {

            try (FileOutputStream fos = new FileOutputStream(zipName)) {

                fos.write(data);

            }

            try (ZipFile zf = new ZipFile(zipName)) {

                if (getInputStream) {

                    InputStream is = zf.getInputStream(new ZipEntry("x"));

                    is.read();

                }

            }

            fail("Failed to throw expected ZipException");

        } catch (ZipException e) {

            if (e.getMessage().matches(msgPattern))

                passed++;

            else

                unexpected(e);

        } catch (Throwable t) {

            unexpected(t);

        } finally {

            new File(zipName).delete();

        }

    }

    static void checkZipException(byte[] data, String msgPattern) {

        checkZipExceptionImpl(data, msgPattern, false);

    }

    static void checkZipExceptionInGetInputStream(byte[] data, String msgPattern) {

        checkZipExceptionImpl(data, msgPattern, true);

    }

    static int u8(byte[] data, int offset) {

        return data[offset]&0xff;

    }

    static int u16(byte[] data, int offset) {

        return u8(data,offset) + (u8(data,offset+1)<<8);

    }

    static int u32(byte[] data, int offset) {

        return u16(data,offset) + (u16(data,offset+2)<<16);

    }

    // The following can be deleted once this bug is fixed:

    // 6225935: "import static" accessibility rules for symbols different for no reason

    static final long LOCSIG = ZipFile.LOCSIG;

    static final long EXTSIG = ZipFile.EXTSIG;

    static final long CENSIG = ZipFile.CENSIG;

    static final long ENDSIG = ZipFile.ENDSIG;

    static final int LOCHDR = ZipFile.LOCHDR;

    static final int EXTHDR = ZipFile.EXTHDR;

    static final int CENHDR = ZipFile.CENHDR;

    static final int ENDHDR = ZipFile.ENDHDR;

    static final int LOCVER = ZipFile.LOCVER;

    static final int LOCFLG = ZipFile.LOCFLG;

    static final int LOCHOW = ZipFile.LOCHOW;

    static final int LOCTIM = ZipFile.LOCTIM;

    static final int LOCCRC = ZipFile.LOCCRC;

    static final int LOCSIZ = ZipFile.LOCSIZ;

    static final int LOCLEN = ZipFile.LOCLEN;

    static final int LOCNAM = ZipFile.LOCNAM;

    static final int LOCEXT = ZipFile.LOCEXT;

    static final int CENVEM = ZipFile.CENVEM;

    static final int CENVER = ZipFile.CENVER;

    static final int CENFLG = ZipFile.CENFLG;

    static final int CENHOW = ZipFile.CENHOW;

    static final int CENTIM = ZipFile.CENTIM;

    static final int CENCRC = ZipFile.CENCRC;

    static final int CENSIZ = ZipFile.CENSIZ;

    static final int CENLEN = ZipFile.CENLEN;

    static final int CENNAM = ZipFile.CENNAM;

    static final int CENEXT = ZipFile.CENEXT;

    static final int CENCOM = ZipFile.CENCOM;

    static final int CENDSK = ZipFile.CENDSK;

    static final int CENATT = ZipFile.CENATT;

    static final int CENATX = ZipFile.CENATX;

    static final int CENOFF = ZipFile.CENOFF;

    static final int ENDSUB = ZipFile.ENDSUB;

    static final int ENDTOT = ZipFile.ENDTOT;

    static final int ENDSIZ = ZipFile.ENDSIZ;

    static final int ENDOFF = ZipFile.ENDOFF;

    static final int ENDCOM = ZipFile.ENDCOM;

}