--- /dev/null	2019-02-07 20:54:51.336000000 +0300
+++ new/test/lib/jdk/test/lib/hprof/parser/Reader.java	2019-02-08 18:34:10.430875392 +0300
@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 1997, 2017, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+
+
+/*
+ * The Original Code is HAT. The Initial Developer of the
+ * Original Code is Bill Foote, with contributions from others
+ * at JavaSoft/Sun.
+ */
+
+package jdk.test.lib.hprof.parser;
+
+import java.io.*;
+import jdk.test.lib.hprof.model.*;
+
+/**
+ * Abstract base class for reading object dump files.  A reader need not be
+ * thread-safe.
+ *
+ * @author      Bill Foote
+ */
+
+
+public abstract class Reader {
+    protected PositionDataInputStream in;
+
+    protected Reader(PositionDataInputStream in) {
+        this.in = in;
+    }
+
+    /**
+     * Read a snapshot from a data input stream.  It is assumed that the magic
+     * number has already been read.
+     */
+    abstract public Snapshot read() throws IOException;
+
+    /**
+     * Read a snapshot from a file.
+     *
+     * @param heapFile The name of a file containing a heap dump
+     * @param callStack If true, read the call stack of allocaation sites
+     */
+    public static Snapshot readFile(String heapFile, boolean callStack,
+                                    int debugLevel)
+            throws IOException {
+        int dumpNumber = 1;
+        int pos = heapFile.lastIndexOf('#');
+        if (pos > -1) {
+            String num = heapFile.substring(pos+1, heapFile.length());
+            try {
+                dumpNumber = Integer.parseInt(num, 10);
+            } catch (java.lang.NumberFormatException ex) {
+                String msg = "In file name \"" + heapFile
+                             + "\", a dump number was "
+                             + "expected after the :, but \""
+                             + num + "\" was found instead.";
+                System.err.println(msg);
+                throw new IOException(msg);
+            }
+            heapFile = heapFile.substring(0, pos);
+        }
+        try (PositionDataInputStream in = new PositionDataInputStream(
+                new BufferedInputStream(new FileInputStream(heapFile)))) {
+            int i = in.readInt();
+            if (i == HprofReader.MAGIC_NUMBER) {
+                Reader r
+                    = new HprofReader(heapFile, in, dumpNumber,
+                                      callStack, debugLevel);
+                return r.read();
+            } else {
+                throw new IOException("Unrecognized magic number: " + i);
+            }
+        }
+    }
+
+    /**
+     * Get Stack Traces from a Hprof file.
+     *
+     * @param heapFile The name of a file containing a heap dump
+     */
+    public static String getStack(String heapFile, int debugLevel)
+            throws IOException {
+        int dumpNumber = 1;
+        int pos = heapFile.lastIndexOf('#');
+        if (pos > -1) {
+            String num = heapFile.substring(pos+1, heapFile.length());
+            try {
+                dumpNumber = Integer.parseInt(num, 10);
+            } catch (java.lang.NumberFormatException ex) {
+                String msg = "In file name \"" + heapFile
+                             + "\", a dump number was "
+                             + "expected after the :, but \""
+                             + num + "\" was found instead.";
+                System.err.println(msg);
+                throw new IOException(msg);
+            }
+            heapFile = heapFile.substring(0, pos);
+        }
+        try (PositionDataInputStream in = new PositionDataInputStream(
+                new BufferedInputStream(new FileInputStream(heapFile)))) {
+            int i = in.readInt();
+            if (i == HprofReader.MAGIC_NUMBER) {
+                HprofReader r
+                    = new HprofReader(heapFile, in, dumpNumber,
+                                      true, debugLevel);
+                r.read();
+                return r.printStackTraces();
+            } else {
+                throw new IOException("Unrecognized magic number: " + i);
+            }
+        }
+    }
+}