--- /dev/null	2020-01-02 04:43:18.583999853 +0000
+++ new/test/lib/jdk/test/lib/hprof/parser/FileReadBuffer.java	2020-01-30 06:39:45.122235406 +0000
@@ -0,0 +1,94 @@
+/*
+ * 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.IOException;
+import java.io.RandomAccessFile;
+
+/**
+ * Implementation of ReadBuffer using a RandomAccessFile
+ *
+ * @author A. Sundararajan
+ */
+class FileReadBuffer implements ReadBuffer {
+    // underlying file to read
+    private RandomAccessFile file;
+
+    FileReadBuffer(RandomAccessFile file) {
+        this.file = file;
+    }
+
+    private void seek(long pos) throws IOException {
+        file.getChannel().position(pos);
+    }
+
+    public synchronized void get(long pos, byte[] buf) throws IOException {
+        seek(pos);
+        file.read(buf);
+    }
+
+    @Override
+    public synchronized char getChar(long pos) throws IOException {
+        seek(pos);
+        return file.readChar();
+    }
+
+    @Override
+    public synchronized byte getByte(long pos) throws IOException {
+        seek(pos);
+        return (byte) file.read();
+    }
+
+    @Override
+    public synchronized short getShort(long pos) throws IOException {
+        seek(pos);
+        return file.readShort();
+    }
+
+    @Override
+    public synchronized int getInt(long pos) throws IOException {
+        seek(pos);
+        return file.readInt();
+    }
+
+    @Override
+    public synchronized long getLong(long pos) throws IOException {
+        seek(pos);
+        return file.readLong();
+    }
+
+    @Override
+    public void close() throws Exception {
+        file.close();
+    }
+}