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diff --git a/lib/unicode.h b/lib/unicode.h
new file mode 100644
index 000000000..0f20bdc78
--- /dev/null
+++ b/lib/unicode.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2009 Nicira Networks.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef UNICODE_H
+#define UNICODE_H 1
+
+#include <stdbool.h>
+
+/* Returns true if 'c' is a Unicode code point, otherwise false. */
+static inline bool
+uc_is_code_point(int c)
+{
+    return c >= 0 && c <= 0x10ffff;
+}
+
+/* Returns true if 'c' is a Unicode code point for a leading surrogate. */
+static inline bool
+uc_is_leading_surrogate(int c)
+{
+    return c >= 0xd800 && c <= 0xdbff;
+}
+
+/* Returns true if 'c' is a Unicode code point for a trailing surrogate. */
+static inline bool
+uc_is_trailing_surrogate(int c)
+{
+    return c >= 0xdc00 && c <= 0xdfff;
+}
+
+/* Returns true if 'c' is a Unicode code point for a leading or trailing
+ * surrogate. */
+static inline bool
+uc_is_surrogate(int c)
+{
+    return c >= 0xd800 && c <= 0xdfff;
+}
+
+int utf16_decode_surrogate_pair(int leading, int trailing);
+
+#endif /* unicode.h */