[Kaffe] new patch for ZipOutputStream

Moses DeJong dejong at cs.umn.edu
Mon Feb 15 20:47:52 PST 1999


Here is a quick patch to fix a problem in the java.util.zip.ZipOutputStream
class in Kaffe. The small example shows that kaffe does not generate an
error when 0 files are added to a Zip entry. My patch to fix this is
included below.

// Test Kaffe Zip impl to make sure error is raised when
// no ZipEntry objects are added to a ZipOutputStream

import java.io.*;
import java.util.zip.*;

public class EmptyZip {
    public static void main(String[] argv) throws Exception {
	ByteArrayOutputStream baos = new ByteArrayOutputStream();
	ZipOutputStream zout = new ZipOutputStream(baos);

JDK 1.2

% java EmptyZip
Exception in thread "main" java.util.zip.ZipException: ZIP file must have at least one entry
        at java.util.zip.ZipOutputStream.finish(ZipOutputStream.java:291)
        at java.util.zip.ZipOutputStream.close(ZipOutputStream.java:309)
        at EmptyZip.main(EmptyZip.java:11)


% kaffe EmptyZip (no error generated)

Kaffe with my patch added

% kaffe EmptyZip
java.util.zip.ZipException: ZIP file must have at least one entry
        at java.lang.Throwable.<init>(Throwable.java:37)
        at java.lang.Exception.<init>(Exception.java:21)
        at java.io.IOException.<init>(IOException.java:22)
        at java.util.zip.ZipException.<init>(ZipException.java:24)
        at java.util.zip.ZipOutputStream.finish(ZipOutputStream.java:178)
        at java.util.zip.ZipOutputStream.close(ZipOutputStream.java:99)
        at EmptyZip.main(EmptyZip.java:11)

The Patch.

Index: ZipOutputStream.java
RCS file: /home/cvspublic/kaffe/libraries/javalib/java/util/zip/ZipOutputStream.java,v
retrieving revision 1.3
diff -u -r1.3 ZipOutputStream.java
--- ZipOutputStream.java	1999/02/13 09:02:58	1.3
+++ ZipOutputStream.java	1999/02/16 05:48:49
@@ -172,6 +172,12 @@
 		size += CEN_RECSZ + ze.name.length();
+	// Flag error if no entries were written.
+	if (count == 0) {
+	        throw new ZipException("ZIP file must have at least one entry");
+	}
 	put32(ce, END_SIGNATURE, (int)END_ENDSIG);
 	put16(ce, END_DISKNUMBER, 0);
 	put16(ce, END_CENDISKNUMBER, 0);

Mo DeJong
dejong at cs.umn.edu

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