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;
+ }
+}