diff -r 1a8d65e71a66 -r aec7bf35d6f5 src/jdk.internal.vm.compiler/share/classes/org.graalvm.util/src/org/graalvm/util/TypedDataInputStream.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.util/src/org/graalvm/util/TypedDataInputStream.java	Thu Oct 31 16:54:16 2019 -0700
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2019, 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.
+ */
+
+
+package org.graalvm.util;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * A stream that can read (trivial) values using their in-band data type information, intended for
+ * use with {@link TypedDataOutputStream}.
+ */
+public class TypedDataInputStream extends DataInputStream {
+    public TypedDataInputStream(InputStream in) {
+        super(in);
+    }
+
+    /**
+     * Reads a single value, using the data type encoded in the stream.
+     *
+     * @return The read value, such as a boxed primitive or a {@link String}.
+     * @exception IOException in case of an I/O error.
+     */
+    public Object readTypedValue() throws IOException {
+        Object value;
+        final byte type = readByte();
+        switch (type) {
+            case 'Z':
+                value = readBoolean();
+                break;
+            case 'B':
+                value = readByte();
+                break;
+            case 'S':
+                value = readShort();
+                break;
+            case 'C':
+                value = readChar();
+                break;
+            case 'I':
+                value = readInt();
+                break;
+            case 'J':
+                value = readLong();
+                break;
+            case 'F':
+                value = readFloat();
+                break;
+            case 'D':
+                value = readDouble();
+                break;
+            case 'U':
+                value = readUTF();
+                break;
+            default:
+                throw new IOException("Unsupported type: " + Integer.toHexString(type));
+        }
+        return value;
+    }
+}