1 /*

     2  * Copyright 2008 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

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

    21  * have any questions.

    22  */

    23 

    24 /* @test

    25  * @bug 6334003 6440786

    26  * @summary Test ability to write and read zip files that have no entries.

    27  * @author Dave Bristor

    28  */

    29 

    30 import java.io.*;

    31 import java.util.*;

    32 import java.util.zip.*;

    33 

    34 public class TestEmptyZip {

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

    36         String zipName = "foo.zip";

    37         File f = new File(System.getProperty("test.scratch", "."), zipName);

    38         if (f.exists() && !f.delete()) {

    39             throw new Exception("failed to delete " + zipName);

    40         }

    41 

    42         // Verify 0-length file cannot be read

    43         f.createNewFile();

    44         ZipFile zf = null;

    45         try {

    46             zf = new ZipFile(f);

    47             fail();

    48         } catch (Exception ex) {

    49             check(ex.getMessage().contains("zip file is empty"));

    50         } finally {

    51             if (zf != null) {

    52                 zf.close();

    53             }

    54         }

    55 

    56         ZipInputStream zis = null;

    57         try {

    58             zis = new ZipInputStream(new FileInputStream(f));

    59             ZipEntry ze = zis.getNextEntry();

    60             check(ze == null);

    61         } catch (Exception ex) {

    62             unexpected(ex);

    63         } finally {

    64             if (zis != null) {

    65                 zis.close();

    66             }

    67         }

    68 

    69         f.delete();

    70 

    71         // Verify 0-entries file can be written

    72         write(f);

    73 

    74         // Verify 0-entries file can be read

    75         readFile(f);

    76         readStream(f);

    77 

    78         f.delete();

    79     }

    80 

    81     static void write(File f) throws Exception {

    82         ZipOutputStream zos = null;

    83         try {

    84             zos = new ZipOutputStream(new FileOutputStream(f));

    85             zos.finish();

    86             zos.close();

    87             pass();

    88         } catch (Exception ex) {

    89             unexpected(ex);

    90         } finally {

    91             if (zos != null) {

    92                 zos.close();

    93             }

    94         }

    95     }

    96 

    97     static void readFile(File f) throws Exception {

    98         ZipFile zf = null;

    99         try {

   100             zf = new ZipFile(f);

   101 

   102             Enumeration e = zf.entries();

   103             while (e.hasMoreElements()) {

   104                 ZipEntry entry = (ZipEntry) e.nextElement();

   105                 fail();

   106             }

   107             zf.close();

   108             pass();

   109         } catch (Exception ex) {

   110             unexpected(ex);

   111         } finally {

   112             if (zf != null) {

   113                 zf.close();

   114             }

   115         }

   116     }

   117 

   118     static void readStream(File f) throws Exception {

   119         ZipInputStream zis = null;

   120         try {

   121             zis = new ZipInputStream(new FileInputStream(f));

   122             ZipEntry ze = zis.getNextEntry();

   123             check(ze == null);

   124             byte[] buf = new byte[1024];

   125             check(zis.read(buf, 0, 1024) == -1);

   126         } finally {

   127             if (zis != null) {

   128                 zis.close();

   129             }

   130         }

   131     }

   132 

   133     //--------------------- Infrastructure ---------------------------

   134     static volatile int passed = 0, failed = 0;

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

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

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

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

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

   140     static boolean equal(Object x, Object y) {

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

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

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

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

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

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

   147 }