1 files changed, 118 insertions, 0 deletions
diff --git a/test/sun/misc/IOUtils/ReadNBytes.java b/test/sun/misc/IOUtils/ReadNBytes.java
new file mode 100644
index 0000000000..afe943fefb
--- /dev/null
+++ b/test/sun/misc/IOUtils/ReadNBytes.java
@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2015, 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.
+ */
+
+import java.io.ByteArrayInputStream;
+import java.io.FilterInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Arrays;
+import java.util.Random;
+import jdk.testlibrary.RandomFactory;
+
+import sun.misc.IOUtils;
+
+/*
+ * @test
+ * @bug 8080835
+ * @library /lib/testlibrary
+ * @build jdk.testlibrary.*
+ * @run main ReadNBytes
+ * @summary Basic test for IOUtils.readNBytes
+ * @key randomness
+ */
+
+public class ReadNBytes {
+
+    private static Random generator = RandomFactory.getRandom();
+
+    public static void main(String[] args) throws IOException {
+        test(new byte[]{1, 2, 3});
+        test(createRandomBytes(1024));
+        test(createRandomBytes((1 << 13) - 1));
+        test(createRandomBytes((1 << 13)));
+        test(createRandomBytes((1 << 13) + 1));
+        test(createRandomBytes((1 << 15) - 1));
+        test(createRandomBytes((1 << 15)));
+        test(createRandomBytes((1 << 15) + 1));
+        test(createRandomBytes((1 << 17) - 1));
+        test(createRandomBytes((1 << 17)));
+        test(createRandomBytes((1 << 17) + 1));
+    }
+
+    static void test(byte[] inputBytes) throws IOException {
+        int length = inputBytes.length;
+        WrapperInputStream in = new WrapperInputStream(new ByteArrayInputStream(inputBytes));
+        byte[] readBytes = new byte[(length / 2) + 1];
+        int nread = IOUtils.readNBytes(in, readBytes, 0, readBytes.length);
+
+        int x;
+        byte[] tmp;
+        check(nread == readBytes.length,
+              "Expected number of bytes read: " + readBytes.length + ", got: " + nread);
+        check(Arrays.equals((tmp = Arrays.copyOf(inputBytes, nread)), readBytes),
+              "Expected[" + tmp + "], got:[" + readBytes + "]");
+        check(!in.isClosed(), "Stream unexpectedly closed");
+
+        // Read again
+        nread = IOUtils.readNBytes(in, readBytes, 0, readBytes.length);
+
+        check(nread == length - readBytes.length,
+              "Expected number of bytes read: " + (length - readBytes.length) + ", got: " + nread);
+        check(Arrays.equals((tmp = Arrays.copyOfRange(inputBytes, readBytes.length, length)),
+                            Arrays.copyOf(readBytes, nread)),
+              "Expected[" + tmp + "], got:[" + readBytes + "]");
+        // Expect end of stream
+        check((x = in.read()) == -1,
+              "Expected end of stream from read(), got " + x);
+        check((x = in.read(tmp)) == -1,
+              "Expected end of stream from read(byte[]), got " + x);
+        check((x = in.read(tmp, 0, tmp.length)) == -1,
+              "Expected end of stream from read(byte[], int, int), got " + x);
+        check((x = IOUtils.readNBytes(in, tmp, 0, tmp.length)) == 0,
+              "Expected end of stream, 0, from readNBytes(byte[], int, int), got " + x);
+        check(!in.isClosed(), "Stream unexpectedly closed");
+    }
+
+    static byte[] createRandomBytes(int size) {
+        byte[] bytes = new byte[size];
+        generator.nextBytes(bytes);
+        return bytes;
+    }
+
+    static void check(boolean cond, Object ... failedArgs) {
+        if (cond)
+            return;
+        StringBuilder sb = new StringBuilder();
+        for (Object o : failedArgs)
+            sb.append(o);
+        throw new RuntimeException(sb.toString());
+    }
+
+
+    static class WrapperInputStream extends FilterInputStream {
+        private boolean closed;
+        WrapperInputStream(InputStream in) { super(in); }
+        @Override public void close() throws IOException { closed = true; in.close(); }
+        boolean isClosed() { return closed; }
+    }
+}