--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/serial/VariableLengthIntBuffer.java	Wed Oct 02 15:33:08 2013 +0200
@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2012, 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 com.oracle.truffle.api.nodes.serial;
+
+import java.nio.*;
+
+/**
+ * Experimental API. May change without notice. Simple variable length unsigned int buffer backed by
+ * a byte buffer.
+ */
+public class VariableLengthIntBuffer {
+
+    public static final int NULL = -1;
+
+    private ByteBuffer buffer;
+
+    public VariableLengthIntBuffer(ByteBuffer buffer) {
+        this.buffer = buffer;
+    }
+
+    public VariableLengthIntBuffer(byte[] array) {
+        buffer = ByteBuffer.wrap(array);
+    }
+
+    /**
+     * Returns the backing byte buffer.
+     */
+    public ByteBuffer getBuffer() {
+        return buffer;
+    }
+
+    public byte[] getBytes() {
+        int pos = buffer.position();
+        byte[] bytes = new byte[buffer.position()];
+        buffer.rewind();
+        buffer.get(bytes);
+        buffer.position(pos);
+        return bytes;
+    }
+
+    public int get() {
+        byte peekByte = buffer.get(buffer.position());
+        if ((peekByte & 0x80) == 0) {
+            // single byte encoding with prefix 0 (range 127)
+            return buffer.get(); // no bit to be masked
+        } else {
+            if (peekByte == (byte) 0xFF) {
+                buffer.get(); // skip one byte
+                return NULL;
+            }
+            int result = buffer.getInt() & 0x7FFF_FFFF; // first bit masked out
+            assert (result & 0x4000_0000) == 0;
+            return result;
+        }
+    }
+
+    public void put(int i) {
+        ensureCapacity();
+        if (i == NULL) {
+            buffer.put((byte) 0xFF);
+        } else if ((i & 0xFFFF_FF80) == 0) { // 7 bits data
+            buffer.put((byte) i);
+        } else if ((i & 0xC000_0000) == 0) { // 32 bits data
+            buffer.putInt(i | 0x8000_0000); // append leading 1
+        } else {
+            throw new IllegalArgumentException("Integer out of encodeable " + i);
+        }
+    }
+
+    private void ensureCapacity() {
+        if (buffer.position() + 4 > buffer.capacity()) {
+            ByteBuffer newBuffer = ByteBuffer.allocate(buffer.capacity() * 2);
+
+            int pos = buffer.position();
+            buffer.rewind();
+            newBuffer.put(buffer);
+            newBuffer.position(pos);
+
+            buffer = newBuffer;
+        }
+    }
+
+    public boolean hasRemaining() {
+        return buffer.hasRemaining();
+    }
+
+}