undefect. CWE-407 — 63 sites patched across 27 ecosystems

Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.

test/jdk/java/nio/channels/FileChannel/Position.java

@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2000, 2011, 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 4429043 6526860
+ * @summary Test position method of FileChannel
+ * @key randomness
+ */
+
+import java.io.*;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+import java.nio.file.*;
+import static java.nio.file.StandardOpenOption.*;
+import java.nio.charset.Charset;
+import java.util.Random;
+
+
+/**
+ * Testing FileChannel's position method.
+ */
+
+public class Position {
+
+    private static final Charset ISO8859_1 = Charset.forName("8859_1");
+
+    private static final Random generator = new Random();
+
+    public static void main(String[] args) throws Exception {
+        Path blah = Files.createTempFile("blah", null);
+        blah.toFile().deleteOnExit();
+        initTestFile(blah);
+
+        for (int i=0; i<10; i++) {
+            try (FileChannel fc = (generator.nextBoolean()) ?
+                    FileChannel.open(blah, READ) :
+                    new FileInputStream(blah.toFile()).getChannel()) {
+                for (int j=0; j<100; j++) {
+                    long newPos = generator.nextInt(1000);
+                    fc.position(newPos);
+                    if (fc.position() != newPos)
+                        throw new RuntimeException("Position failed");
+                }
+            }
+        }
+
+        for (int i=0; i<10; i++) {
+            try (FileChannel fc = (generator.nextBoolean()) ?
+                     FileChannel.open(blah, APPEND) :
+                     new FileOutputStream(blah.toFile(), true).getChannel()) {
+                for (int j=0; j<10; j++) {
+                    if (fc.position() != fc.size())
+                        throw new RuntimeException("Position expected to be size");
+                    byte[] buf = new byte[generator.nextInt(100)];
+                    fc.write(ByteBuffer.wrap(buf));
+                }
+            }
+        }
+
+        Files.delete(blah);
+    }
+
+    /**
+     * Creates file blah:
+     * 0000
+     * 0001
+     * 0002
+     * 0003
+     * .
+     * .
+     * .
+     * 3999
+     *
+     */
+    private static void initTestFile(Path blah) throws IOException {
+        try (BufferedWriter awriter = Files.newBufferedWriter(blah, ISO8859_1)) {
+            for(int i=0; i<4000; i++) {
+                String number = new Integer(i).toString();
+                for (int h=0; h<4-number.length(); h++)
+                    awriter.write("0");
+                awriter.write(""+i);
+                awriter.newLine();
+            }
+        }
+    }
+}