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comparison src/share/vm/utilities/utf8.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 1997-2003 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any 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 };