--- a/jdk/src/share/classes/com/sun/java/util/jar/pack/NativeUnpack.java	Mon Aug 23 17:35:18 2010 +0100
+++ b/jdk/src/share/classes/com/sun/java/util/jar/pack/NativeUnpack.java	Mon Aug 23 08:18:08 2010 -0700
@@ -211,10 +211,10 @@
                 ++_fileCount;
                 updateProgress();
             }
+            presetInput = getUnusedInput();
             long consumed = finish();
             if (_verbose > 0)
                 Utils.log.info("bytes consumed = "+consumed);
-            presetInput = getUnusedInput();
             if (presetInput == null &&
                 !Utils.isPackMagic(Utils.readMagic(in))) {
                 break;

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/tools/pack200/UnpackerMemoryTest.java	Mon Aug 23 08:18:08 2010 -0700
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2010, Oracle and/or its affiliates. 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 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 6531345
+ * @summary check for unpacker memory leaks
+ * @compile -XDignore.symbol.file Utils.java UnpackerMemoryTest.java
+ * @run main/othervm/timeout=1200 -Xmx32m UnpackerMemoryTest
+ * @author ksrini
+ */
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.PrintStream;
+import java.io.IOException;
+import java.util.jar.JarFile;
+import java.util.jar.JarOutputStream;
+
+public class UnpackerMemoryTest {
+
+    private static void createPackFile(File packFile) throws IOException {
+        File tFile = new File("test.dat");
+        FileOutputStream fos = null;
+        PrintStream ps = null;
+        String jarFileName = Utils.baseName(packFile, Utils.PACK_FILE_EXT)
+                + Utils.JAR_FILE_EXT;
+        JarFile jarFile = null;
+        try {
+            fos = new FileOutputStream(tFile);
+            ps = new PrintStream(fos);
+            ps.println("A quick brown fox");
+            Utils.jar("cvf", jarFileName, tFile.getName());
+            jarFile = new JarFile(jarFileName);
+            Utils.pack(jarFile, packFile);
+        } finally {
+            Utils.close(ps);
+            tFile.delete();
+            Utils.close(jarFile);
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        String name = "foo";
+        File packFile = new File(name + Utils.PACK_FILE_EXT);
+        createPackFile(packFile);
+        if (!packFile.exists()) {
+           throw new RuntimeException(packFile + " not found");
+        }
+        File jarOut = new File(name + ".out");
+        for (int i = 0; i < 2000; i++) {
+            JarOutputStream jarOS = null;
+            FileOutputStream fos = null;
+            try {
+                fos = new FileOutputStream(jarOut);
+                jarOS = new JarOutputStream(fos);
+                System.out.println("Unpacking[" + i + "]" + packFile);
+                Utils.unpackn(packFile, jarOS);
+            }  finally {
+                Utils.close(jarOS);
+                Utils.close(fos);
+            }
+        }
+    }
+}
+

--- a/jdk/test/tools/pack200/Utils.java	Mon Aug 23 17:35:18 2010 +0100
+++ b/jdk/test/tools/pack200/Utils.java	Mon Aug 23 08:18:08 2010 -0700
@@ -221,6 +221,18 @@
         setFileAttributes(src, dst);
     }
 
+    static String baseName(File file, String extension) {
+        return baseName(file.getAbsolutePath(), extension);
+    }
+
+    static String baseName(String name, String extension) {
+        int cut = name.length() - extension.length();
+        return name.lastIndexOf(extension) == cut
+                ? name.substring(0, cut)
+                : name;
+
+    }
+
     /*
      * Suppose a path is provided which consists of a full path
      * this method returns the sub path for a full path ex: /foo/bar/baz/foobar.z