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 /*

  * Copyright (c) 1997, 2010, 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"

 #include "utilities/top.hpp"

 // Low-level interface for UTF8 strings

 class UTF8 : AllStatic {

  public:

   // returns the unicode length of a 0-terminated uft8 string

   static int unicode_length(const char* uft8_str);

   // returns the unicode length of a non-0-terminated uft8 string

   static int unicode_length(const char* uft8_str, int len);

   // converts a uft8 string to a unicode string

   static void convert_to_unicode(const char* utf8_str, jchar* unicode_buffer, int unicode_length);

   // decodes the current utf8 character, stores the result in value,

   // and returns the end of the current uft8 chararacter.

   static char* next(const char* str, jchar* 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 uft8 chararacter.

   static char* next_character(const char* str, jint* value);

   // Utility methods

   static jbyte* strrchr(jbyte* base, int length, jbyte c);

   static bool   equal(jbyte* base1, int length1, jbyte* base2, int length2);

   static bool   is_supplementary_character(const unsigned char* str);

   static jint   get_supplementary_character(const unsigned char* str);

 };

 // 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:

   // returns the utf8 size of a unicode character

   static int utf8_size(jchar c);

   // returns the utf8 length of a unicode string

   static int utf8_length(jchar* 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.

   static char* as_utf8(jchar* base, int length);

   static char* as_utf8(jchar* base, int length, char* buf, int buflen);

 };

 #endif // SHARE_VM_UTILITIES_UTF8_HPP