utf8.hpp revision 1472:c18cbe5936b8 
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.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23 */
24
25// Low-level interface for UTF8 strings
26
27class 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
61class 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};
77