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diff --git a/src/ceph/src/common/utf8.h b/src/ceph/src/common/utf8.h
new file mode 100644
index 0000000..83efe6f
--- /dev/null
+++ b/src/ceph/src/common/utf8.h
@@ -0,0 +1,66 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2011 New Dream Network
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_COMMON_UTF8_H
+#define CEPH_COMMON_UTF8_H
+
+#define MAX_UTF8_SZ 6
+#define INVALID_UTF8_CHAR 0xfffffffful
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Checks if a buffer is valid UTF-8.
+ * Returns 0 if it is, and one plus the offset of the first invalid byte
+ * if it is not.
+ */
+int check_utf8(const char *buf, int len);
+
+/* Checks if a null-terminated string is valid UTF-8.
+ * Returns 0 if it is, and one plus the offset of the first invalid byte
+ * if it is not.
+ */
+int check_utf8_cstr(const char *buf);
+
+/* Returns true if 'ch' is a control character.
+ * We do count newline as a control character, but not NULL.
+ */
+int is_control_character(int ch);
+
+/* Checks if a buffer contains control characters.
+ */
+int check_for_control_characters(const char *buf, int len);
+
+/* Checks if a null-terminated string contains control characters.
+ */
+int check_for_control_characters_cstr(const char *buf);
+
+/* Encode a 31-bit UTF8 code point to 'buf'.
+ * Assumes buf is of size MAX_UTF8_SZ
+ * Returns -1 on failure; number of bytes in the encoded value otherwise.
+ */
+int encode_utf8(unsigned long u, unsigned char *buf);
+
+/*
+ * Decode a UTF8 character from an array of bytes. Return character code.
+ * Upon error, return INVALID_UTF8_CHAR.
+ */
+unsigned long decode_utf8(unsigned char *buf, int nbytes);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif