--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.net.http/share/classes/java/net/http/internal/hpack/SizeUpdateWriter.java	Wed Feb 07 14:17:24 2018 +0000
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2015, 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 java.net.http.internal.hpack;
+
+import java.nio.ByteBuffer;
+
+final class SizeUpdateWriter implements BinaryRepresentationWriter {
+
+    private final IntegerWriter intWriter = new IntegerWriter();
+    private int maxSize;
+    private boolean tableUpdated;
+
+    SizeUpdateWriter() { }
+
+    SizeUpdateWriter maxHeaderTableSize(int size) {
+        intWriter.configure(size, 5, 0b0010_0000);
+        this.maxSize = size;
+        return this;
+    }
+
+    @Override
+    public boolean write(HeaderTable table, ByteBuffer destination) {
+        if (!tableUpdated) {
+            table.setMaxSize(maxSize);
+            tableUpdated = true;
+        }
+        return intWriter.write(destination);
+    }
+
+    @Override
+    public BinaryRepresentationWriter reset() {
+        intWriter.reset();
+        maxSize = -1;
+        tableUpdated = false;
+        return this;
+    }
+}