Name: tb29552 Date: 01/17/2000


/*
java version "1.3beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3beta-O)
Java(TM) HotSpot Client VM (build 1.3beta-O-release, 1.3beta-O-release,
interpreted mode)


When reading a .zip file using java.util.zip.ZipFile, calls to ZipEntry.getTime
() will return the wrong date/time. This only affects reading a .zip file -
writing works correctly. On Solaris SPARC, the bug is not present in
JDK1.2.1_04, only in JDK1.3beta; I can't speak for other platforms.

The cause of the problem is reading 16 bits instead of 32 bits of data for the
time field(s). (The confusion probably arose because the time field(s) can
either be viewed as a single 32-bit field for date and time, or one 16-bit
field for the time and one for the date.)

  To reproduce, see test case below. Output is as below. The two dates/times
should be almost identical (they would not be totally identical due to
rounding) but they are clearly not.

Java version is 1.3beta
Setting time to: 948045699327 [Sun Jan 16 18:01:39 GMT+00:00 2000]
Time read back as: 312832898000 [Fri Nov 30 18:01:38 GMT+00:00 1979]

TEST CASE:
*/
import java.io.IOException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Date;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;

public class ZipBug {

    static {
System.out.println ("Java version is " +
System.getProperty ("java.version"));
    }

    static final File tempFile = new File ("test.zip");

    public static void main (String args []) throws IOException {
writeZip ();
ReadZip.readZip ();
    }

    static void writeZip () throws IOException {
ZipOutputStream zOut;
zOut = new ZipOutputStream (new FileOutputStream (tempFile));
ZipEntry ze = new ZipEntry ("test");
Date date = new Date (948045699327L); // constant date+time for testing
long time = date.getTime ();
System.out.println ("Setting time to: " + time + " [" + date + "]");
ze.setTime (time);
zOut.putNextEntry (ze);
zOut.write (123); // 1-byte file
zOut.close ();
    }

    // This is a separate class so that ZipBug can be run in JDK1.3beta and
    // then ZipBug.ReadZip can be run in JDK1.2.1, or vice versa.
    public static class ReadZip {

public static void main (String args []) throws IOException {
readZip ();
}

static void readZip () throws IOException {
ZipFile zf = new ZipFile (ZipBug.tempFile);
ZipEntry ze = (ZipEntry) zf.entries ().nextElement ();
long time = ze.getTime ();
Date date = new Date (time);
System.out.println
("Time read back as: " + time + " [" + date + "]");
zf.close ();
}
    } // end class ReadZip
}
(Review ID: 100034)
======================================================================