jdk/test/java/io/SequenceInputStream/LotsOfStreams.java
changeset 23344 70f819173479
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/io/SequenceInputStream/LotsOfStreams.java	Thu Mar 13 07:52:17 2014 +0400
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2014, 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 7011804
+ * @summary SequenceInputStream#read() was implemented recursivly,
+ *          which may cause stack overflow
+ */
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.io.SequenceInputStream;
+import java.util.Enumeration;
+
+public class LotsOfStreams {
+
+    static final int MAX_SUBSTREAMS = 32000;
+
+    public static void main(String[] argv) throws Exception {
+        try (InputStream stream =
+                new SequenceInputStream(new LOSEnumeration())) {
+            stream.read();
+        }
+        try (InputStream stream =
+                new SequenceInputStream(new LOSEnumeration())) {
+            byte[] b = new byte[1];
+            stream.read(b, 0, 1);
+        }
+    }
+
+    static class LOSEnumeration
+            implements Enumeration<InputStream> {
+
+        private static InputStream inputStream =
+                new ByteArrayInputStream(new byte[0]);
+        private int left = MAX_SUBSTREAMS;
+
+        public boolean hasMoreElements() {
+            return (left > 0);
+        }
+        public InputStream nextElement() {
+            left--;
+            return inputStream;
+        }
+    }
+}