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diff --git a/src/lib/base/Unicode.h b/src/lib/base/Unicode.h
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+++ b/src/lib/base/Unicode.h
@@ -0,0 +1,144 @@
+/*
+ * barrier -- mouse and keyboard sharing utility
+ * Copyright (C) 2012-2016 Symless Ltd.
+ * Copyright (C) 2002 Chris Schoeneman
+ * 
+ * This package is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * found in the file LICENSE that should have accompanied this file.
+ * 
+ * This package 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "base/String.h"
+#include "common/basic_types.h"
+
+//! Unicode utility functions
+/*!
+This class provides functions for converting between various Unicode
+encodings and the current locale encoding.
+*/
+class Unicode {
+public:
+    //! @name accessors
+    //@{
+
+    //! Test UTF-8 string for validity
+    /*!
+    Returns true iff the string contains a valid sequence of UTF-8
+    encoded characters.
+    */
+    static bool            isUTF8(const String&);
+
+    //! Convert from UTF-8 to UCS-2 encoding
+    /*!
+    Convert from UTF-8 to UCS-2.  If errors is not NULL then *errors
+    is set to true iff any character could not be encoded in UCS-2.
+    Decoding errors do not set *errors.
+    */
+    static String        UTF8ToUCS2(const String&, bool* errors = NULL);
+
+    //! Convert from UTF-8 to UCS-4 encoding
+    /*!
+    Convert from UTF-8 to UCS-4.  If errors is not NULL then *errors
+    is set to true iff any character could not be encoded in UCS-4.
+    Decoding errors do not set *errors.
+    */
+    static String        UTF8ToUCS4(const String&, bool* errors = NULL);
+
+    //! Convert from UTF-8 to UTF-16 encoding
+    /*!
+    Convert from UTF-8 to UTF-16.  If errors is not NULL then *errors
+    is set to true iff any character could not be encoded in UTF-16.
+    Decoding errors do not set *errors.
+    */
+    static String        UTF8ToUTF16(const String&, bool* errors = NULL);
+
+    //! Convert from UTF-8 to UTF-32 encoding
+    /*!
+    Convert from UTF-8 to UTF-32.  If errors is not NULL then *errors
+    is set to true iff any character could not be encoded in UTF-32.
+    Decoding errors do not set *errors.
+    */
+    static String        UTF8ToUTF32(const String&, bool* errors = NULL);
+
+    //! Convert from UTF-8 to the current locale encoding
+    /*!
+    Convert from UTF-8 to the current locale encoding.  If errors is not
+    NULL then *errors is set to true iff any character could not be encoded.
+    Decoding errors do not set *errors.
+    */
+    static String        UTF8ToText(const String&, bool* errors = NULL);
+
+    //! Convert from UCS-2 to UTF-8
+    /*!
+    Convert from UCS-2 to UTF-8.  If errors is not NULL then *errors is
+    set to true iff any character could not be decoded.
+    */
+    static String        UCS2ToUTF8(const String&, bool* errors = NULL);
+
+    //! Convert from UCS-4 to UTF-8
+    /*!
+    Convert from UCS-4 to UTF-8.  If errors is not NULL then *errors is
+    set to true iff any character could not be decoded.
+    */
+    static String        UCS4ToUTF8(const String&, bool* errors = NULL);
+
+    //! Convert from UTF-16 to UTF-8
+    /*!
+    Convert from UTF-16 to UTF-8.  If errors is not NULL then *errors is
+    set to true iff any character could not be decoded.
+    */
+    static String        UTF16ToUTF8(const String&, bool* errors = NULL);
+
+    //! Convert from UTF-32 to UTF-8
+    /*!
+    Convert from UTF-32 to UTF-8.  If errors is not NULL then *errors is
+    set to true iff any character could not be decoded.
+    */
+    static String        UTF32ToUTF8(const String&, bool* errors = NULL);
+
+    //! Convert from the current locale encoding to UTF-8
+    /*!
+    Convert from the current locale encoding to UTF-8.  If errors is not
+    NULL then *errors is set to true iff any character could not be decoded.
+    */
+    static String        textToUTF8(const String&, bool* errors = NULL);
+
+    //@}
+
+private:
+    // convert UTF8 to wchar_t string (using whatever encoding is native
+    // to the platform).  caller must delete[] the returned string.  the
+    // string is *not* nul terminated;  the length (in characters) is
+    // returned in size.
+    static wchar_t*        UTF8ToWideChar(const String&,
+                            UInt32& size, bool* errors);
+
+    // convert nul terminated wchar_t string (in platform's native
+    // encoding) to UTF8.
+    static String        wideCharToUTF8(const wchar_t*,
+                            UInt32 size, bool* errors);
+
+    // internal conversion to UTF8
+    static String        doUCS2ToUTF8(const UInt8* src, UInt32 n, bool* errors);
+    static String        doUCS4ToUTF8(const UInt8* src, UInt32 n, bool* errors);
+    static String        doUTF16ToUTF8(const UInt8* src, UInt32 n, bool* errors);
+    static String        doUTF32ToUTF8(const UInt8* src, UInt32 n, bool* errors);
+
+    // convert characters to/from UTF8
+    static UInt32        fromUTF8(const UInt8*& src, UInt32& size);
+    static void            toUTF8(String& dst, UInt32 c, bool* errors);
+
+private:
+    static UInt32        s_invalid;
+    static UInt32        s_replacement;
+};