--- /dev/null	2018-01-04 08:51:07.000000000 -0800
+++ new/src/java.base/share/classes/jdk/internal/io/IOSupport.java	2018-01-04 08:51:07.000000000 -0800
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2018, 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.
+ */
+package jdk.internal.io;
+
+import java.io.InputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.ArrayList;
+import java.util.Arrays;
+
+/**
+ * Utility methods data input and output.
+ */
+public class IOSupport {
+    // buffer size used for reading and writing
+    private static final int DEFAULT_BUFFER_SIZE = 8192;
+
+    /**
+     * Reads all bytes from an input stream and writes them to an output stream.
+     */
+    public static long copy(InputStream source, OutputStream sink)
+        throws IOException
+    {
+        return copy(source, sink, DEFAULT_BUFFER_SIZE);
+    }
+
+    public static long copy(InputStream source, OutputStream sink,
+        int bufferSize) throws IOException
+    {
+        long nread = 0L;
+        byte[] buf = new byte[bufferSize];
+        int n;
+        while ((n = source.read(buf)) >= 0) {
+            sink.write(buf, 0, n);
+            nread += n;
+        }
+        return nread;
+    }
+}