--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/sun/management/jdp/JdpTestUtil.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,142 @@
+/*
+ * Copyright (c) 2012, 2013, 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.UnsupportedEncodingException;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.logging.ConsoleHandler;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * Utility methods for parsing raw JDP packets.
+ *
+ * @author Alex Schenkman
+ */
+public class JdpTestUtil {
+
+    static final int HEADER_SIZE = 4 + 2;   // magic + protocol version
+
+    /**
+     * Reads two bytes, starting at the given position,
+     * and converts them into an int.
+     *
+     * @param data
+     * @param pos
+     * @return
+     */
+    static int decode2ByteInt(byte[] data, int pos) {
+        return (((data[pos] & 0xFF) << 8) | (data[pos + 1] & 0xFF));
+    }
+
+    /**
+     * Reads four bytes, starting at the given position,
+     * and converts them into an int.
+     *
+     * @param data
+     * @param pos
+     * @return
+     */
+    static int decode4ByteInt(byte[] data, int pos) {
+        int result = data[pos + 3] & 0xFF;
+        result = result | ((data[pos + 2] & 0xFF) << 8);
+        result = result | ((data[pos + 1] & 0xFF) << 16);
+        result = result | ((data[pos] & 0xFF) << 24);
+        return result;
+    }
+
+    /**
+     * Reads an entry from the given byte array, starting at the given position.
+     * This is an internal function used by @see readRawPayload(byte[] rawPayload, int size).
+     * <p/>
+     * The format of an entry is:
+     * 2 bytes with the size of the following string.
+     * n bytes of characters.
+     *
+     * @param data
+     * @param pos
+     * @return
+     * @throws UnsupportedEncodingException
+     */
+    static String decodeEntry(byte[] data, int pos)
+            throws UnsupportedEncodingException {
+
+        int size = JdpTestUtil.decode2ByteInt(data, pos);
+        pos = pos + 2;
+        byte[] raw = Arrays.copyOfRange(data, pos, pos + size);
+        return new String(raw, "UTF-8");
+    }
+
+    /**
+     * Builds a Map with the payload, from the raw data.
+     *
+     * @param rawData
+     * @return
+     * @throws UnsupportedEncodingException
+     */
+    static Map<String, String> readPayload(byte[] rawData)
+            throws UnsupportedEncodingException {
+
+        int totalSize = rawData.length;
+        int payloadSize = totalSize - HEADER_SIZE;
+        byte[] rawPayload = Arrays.copyOfRange(rawData, HEADER_SIZE, HEADER_SIZE + payloadSize);
+        Map<String, String> payload = readRawPayload(rawPayload, payloadSize);
+        return payload;
+    }
+
+    /**
+     * Builds a map from the payload's raw data.
+     * This is an internal function used by @see readPayload(byte[] rawData)
+     *
+     * @param rawPayload
+     * @param size
+     * @return
+     * @throws UnsupportedEncodingException
+     */
+    static Map<String, String> readRawPayload(byte[] rawPayload, int size)
+            throws UnsupportedEncodingException {
+
+        String key, value;
+        Map<String, String> payload = new HashMap<String, String>();
+
+        for (int pos = 0; pos < size; ) {
+            key = decodeEntry(rawPayload, pos);
+            pos = pos + 2 + key.length();
+            value = decodeEntry(rawPayload, pos);
+            pos = pos + 2 + value.length();
+
+            payload.put(key, value);
+        }
+        return payload;
+    }
+
+    static void enableConsoleLogging(Logger log, Level level) throws SecurityException {
+        ConsoleHandler handler = new ConsoleHandler();
+        handler.setLevel(level);
+        log.addHandler(handler);
+        log.setLevel(level);
+    }
+
+}