1 /*
   2  * Copyright (c) 1997, 2003, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 // Low-level interface for UTF8 strings
  26 
  27 class UTF8 : AllStatic {
  28  public:
  29   // returns the unicode length of a 0-terminated uft8 string
  30   static int unicode_length(const char* uft8_str);
  31 
  32   // returns the unicode length of a non-0-terminated uft8 string
  33   static int unicode_length(const char* uft8_str, int len);
  34 
  35   // converts a uft8 string to a unicode string
  36   static void convert_to_unicode(const char* utf8_str, jchar* unicode_buffer, int unicode_length);
  37 
  38   // decodes the current utf8 character, stores the result in value,
  39   // and returns the end of the current uft8 chararacter.
  40   static char* next(const char* str, jchar* value);
  41 
  42   // decodes the current utf8 character, gets the supplementary character instead of
  43   // the surrogate pair when seeing a supplementary character in string,
  44   // stores the result in value, and returns the end of the current uft8 chararacter.
  45   static char* next_character(const char* str, jint* value);
  46 
  47   // Utility methods
  48   static jbyte* strrchr(jbyte* base, int length, jbyte c);
  49   static bool   equal(jbyte* base1, int length1, jbyte* base2, int length2);
  50   static bool   is_supplementary_character(const unsigned char* str);
  51   static jint   get_supplementary_character(const unsigned char* str);
  52 };
  53 
  54 
  55 // Low-level interface for UNICODE strings
  56 
  57 // A unicode string represents a string in the UTF-16 format in which supplementary
  58 // characters are represented by surrogate pairs. Index values refer to char code
  59 // units, so a supplementary character uses two positions in a unicode string.
  60 
  61 class UNICODE : AllStatic {
  62  public:
  63   // returns the utf8 size of a unicode character
  64   static int utf8_size(jchar c);
  65 
  66   // returns the utf8 length of a unicode string
  67   static int utf8_length(jchar* base, int length);
  68 
  69   // converts a unicode string to utf8 string
  70   static void convert_to_utf8(const jchar* base, int length, char* utf8_buffer);
  71 
  72   // converts a unicode string to a utf8 string; result is allocated
  73   // in resource area unless a buffer is provided.
  74   static char* as_utf8(jchar* base, int length);
  75   static char* as_utf8(jchar* base, int length, char* buf, int buflen);
  76 };