--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/utilities/utf8.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 1997, 2015, 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.
+ *
+ */
+
+#ifndef SHARE_VM_UTILITIES_UTF8_HPP
+#define SHARE_VM_UTILITIES_UTF8_HPP
+
+#include "memory/allocation.hpp"
+
+// Low-level interface for UTF8 strings
+
+class UTF8 : AllStatic {
+ public:
+  // returns the unicode length of a 0-terminated utf8 string
+  static int unicode_length(const char* utf8_str) {
+    bool is_latin1, has_multibyte;
+    return unicode_length(utf8_str, is_latin1, has_multibyte);
+  }
+  static int unicode_length(const char* utf8_str, bool& is_latin1, bool& has_multibyte);
+
+  // returns the unicode length of a non-0-terminated utf8 string
+  static int unicode_length(const char* utf8_str, int len) {
+    bool is_latin1, has_multibyte;
+    return unicode_length(utf8_str, len, is_latin1, has_multibyte);
+  }
+  static int unicode_length(const char* utf8_str, int len, bool& is_latin1, bool& has_multibyte);
+
+  // converts a utf8 string to a unicode string
+  template<typename T> static void convert_to_unicode(const char* utf8_str, T* unicode_str, int unicode_length);
+
+  // returns the quoted ascii length of a utf8 string
+  static int quoted_ascii_length(const char* utf8_str, int utf8_length);
+
+  // converts a utf8 string to quoted ascii
+  static void as_quoted_ascii(const char* utf8_str, int utf8_length, char* buf, int buflen);
+
+  // converts a quoted ascii string to utf8 string.  returns the original
+  // string unchanged if nothing needs to be done.
+  static const char* from_quoted_ascii(const char* quoted_ascii_string);
+
+  // decodes the current utf8 character, stores the result in value,
+  // and returns the end of the current utf8 chararacter.
+  template<typename T> static char* next(const char* str, T* value);
+
+  // decodes the current utf8 character, gets the supplementary character instead of
+  // the surrogate pair when seeing a supplementary character in string,
+  // stores the result in value, and returns the end of the current utf8 chararacter.
+  static char* next_character(const char* str, jint* value);
+
+  // Utility methods
+  static const jbyte* strrchr(const jbyte* base, int length, jbyte c);
+  static bool   equal(const jbyte* base1, int length1, const jbyte* base2,int length2);
+  static bool   is_supplementary_character(const unsigned char* str);
+  static jint   get_supplementary_character(const unsigned char* str);
+
+  static bool   is_legal_utf8(const unsigned char* buffer, int length,
+                              bool version_leq_47);
+};
+
+
+// Low-level interface for UNICODE strings
+
+// A unicode string represents a string in the UTF-16 format in which supplementary
+// characters are represented by surrogate pairs. Index values refer to char code
+// units, so a supplementary character uses two positions in a unicode string.
+
+class UNICODE : AllStatic {
+ public:
+  // checks if the given unicode character can be encoded as latin1
+  static bool is_latin1(jchar c);
+
+  // checks if the given string can be encoded as latin1
+  static bool is_latin1(jchar* base, int length);
+
+  // returns the utf8 size of a unicode character
+  static int utf8_size(jchar c);
+  static int utf8_size(jbyte c);
+
+  // returns the utf8 length of a unicode string
+  template<typename T> static int utf8_length(T* base, int length);
+
+  // converts a unicode string to utf8 string
+  static void convert_to_utf8(const jchar* base, int length, char* utf8_buffer);
+
+  // converts a unicode string to a utf8 string; result is allocated
+  // in resource area unless a buffer is provided. The unicode 'length'
+  // parameter is set to the length of the result utf8 string.
+  template<typename T> static char* as_utf8(T* base, int& length);
+  static char* as_utf8(jchar* base, int length, char* buf, int buflen);
+  static char* as_utf8(jbyte* base, int length, char* buf, int buflen);
+
+  // returns the quoted ascii length of a unicode string
+  template<typename T> static int quoted_ascii_length(T* base, int length);
+
+  // converts a unicode string to quoted ascii
+  template<typename T> static void as_quoted_ascii(const T* base, int length, char* buf, int buflen);
+};
+
+#endif // SHARE_VM_UTILITIES_UTF8_HPP