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

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 1997-2004 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 # include "incls/_precompiled.incl"
26 # include "incls/_utf8.cpp.incl"
27
28 // Assume the utf8 string is in legal form and has been
29 // checked in the class file parser/format checker.
30 char* UTF8::next(const char* str, jchar* value) {
31 unsigned const char *ptr = (const unsigned char *)str;
32 unsigned char ch, ch2, ch3;
33 int length = -1; /* bad length */
34 jchar result;
35 switch ((ch = ptr[0]) >> 4) {
36 default:
37 result = ch;
38 length = 1;
39 break;
40
41 case 0x8: case 0x9: case 0xA: case 0xB: case 0xF:
42 /* Shouldn't happen. */
43 break;
44
45 case 0xC: case 0xD:
46 /* 110xxxxx 10xxxxxx */
47 if (((ch2 = ptr[1]) & 0xC0) == 0x80) {
48 unsigned char high_five = ch & 0x1F;
49 unsigned char low_six = ch2 & 0x3F;
50 result = (high_five << 6) + low_six;
51 length = 2;
52 break;
53 }
54 break;
55
56 case 0xE:
57 /* 1110xxxx 10xxxxxx 10xxxxxx */
58 if (((ch2 = ptr[1]) & 0xC0) == 0x80) {
59 if (((ch3 = ptr[2]) & 0xC0) == 0x80) {
60 unsigned char high_four = ch & 0x0f;
61 unsigned char mid_six = ch2 & 0x3f;
62 unsigned char low_six = ch3 & 0x3f;
63 result = (((high_four << 6) + mid_six) << 6) + low_six;
64 length = 3;
65 }
66 }
67 break;
68 } /* end of switch */
69
70 if (length <= 0) {
71 *value = ptr[0]; /* default bad result; */
72 return (char*)(ptr + 1); // make progress somehow
73 }
74
75 *value = result;
76
77 // The assert is correct but the .class file is wrong
78 // assert(UNICODE::utf8_size(result) == length, "checking reverse computation");
79 return (char *)(ptr + length);
80 }
81
82 char* UTF8::next_character(const char* str, jint* value) {
83 unsigned const char *ptr = (const unsigned char *)str;
84 /* See if it's legal supplementary character:
85 11101101 1010xxxx 10xxxxxx 11101101 1011xxxx 10xxxxxx */
86 if (is_supplementary_character(ptr)) {
87 *value = get_supplementary_character(ptr);
88 return (char *)(ptr + 6);
89 }
90 jchar result;
91 char* next_ch = next(str, &result);
92 *value = result;
93 return next_ch;
94 }
95
96 // Count bytes of the form 10xxxxxx and deduct this count
97 // from the total byte count. The utf8 string must be in
98 // legal form which has been verified in the format checker.
99 int UTF8::unicode_length(const char* str, int len) {
100 int num_chars = len;
101 for (int i = 0; i < len; i++) {
102 if ((str[i] & 0xC0) == 0x80) {
103 --num_chars;
104 }
105 }
106 return num_chars;
107 }
108
109 // Count bytes of the utf8 string except those in form
110 // 10xxxxxx which only appear in multibyte characters.
111 // The utf8 string must be in legal form and has been
112 // verified in the format checker.
113 int UTF8::unicode_length(const char* str) {
114 int num_chars = 0;
115 for (const char* p = str; *p; p++) {
116 if (((*p) & 0xC0) != 0x80) {
117 num_chars++;
118 }
119 }
120 return num_chars;
121 }
122
123 // Writes a jchar a utf8 and returns the end
124 static u_char* utf8_write(u_char* base, jchar ch) {
125 if ((ch != 0) && (ch <=0x7f)) {
126 base[0] = (u_char) ch;
127 return base + 1;
128 }
129
130 if (ch <= 0x7FF) {
131 /* 11 bits or less. */
132 unsigned char high_five = ch >> 6;
133 unsigned char low_six = ch & 0x3F;
134 base[0] = high_five | 0xC0; /* 110xxxxx */
135 base[1] = low_six | 0x80; /* 10xxxxxx */
136 return base + 2;
137 }
138 /* possibly full 16 bits. */
139 char high_four = ch >> 12;
140 char mid_six = (ch >> 6) & 0x3F;
141 char low_six = ch & 0x3f;
142 base[0] = high_four | 0xE0; /* 1110xxxx */
143 base[1] = mid_six | 0x80; /* 10xxxxxx */
144 base[2] = low_six | 0x80; /* 10xxxxxx */
145 return base + 3;
146 }
147
148 void UTF8::convert_to_unicode(const char* utf8_str, jchar* unicode_str, int unicode_length) {
149 unsigned char ch;
150 const char *ptr = (const char *)utf8_str;
151 int index = 0;
152
153 /* ASCII case loop optimization */
154 for (; index < unicode_length; index++) {
155 if((ch = ptr[0]) > 0x7F) { break; }
156 unicode_str[index] = ch;
157 ptr = (const char *)(ptr + 1);
158 }
159
160 for (; index < unicode_length; index++) {
161 ptr = UTF8::next(ptr, &unicode_str[index]);
162 }
163 }
164
165 // Returns NULL if 'c' it not found. This only works as long
166 // as 'c' is an ASCII character
167 jbyte* UTF8::strrchr(jbyte* base, int length, jbyte c) {
168 assert(length >= 0, "sanity check");
169 assert(c >= 0, "does not work for non-ASCII characters");
170 // Skip backwards in string until 'c' is found or end is reached
171 while(--length >= 0 && base[length] != c);
172 return (length < 0) ? NULL : &base[length];
173 }
174
175 bool UTF8::equal(jbyte* base1, int length1, jbyte* base2, int length2) {
176 // Length must be the same
177 if (length1 != length2) return false;
178 for (int i = 0; i < length1; i++) {
179 if (base1[i] != base2[i]) return false;
180 }
181 return true;
182 }
183
184 bool UTF8::is_supplementary_character(const unsigned char* str) {
185 return ((str[0] & 0xFF) == 0xED) && ((str[1] & 0xF0) == 0xA0) && ((str[2] & 0xC0) == 0x80)
186 && ((str[3] & 0xFF) == 0xED) && ((str[4] & 0xF0) == 0xB0) && ((str[5] & 0xC0) == 0x80);
187 }
188
189 jint UTF8::get_supplementary_character(const unsigned char* str) {
190 return 0x10000 + ((str[1] & 0x0f) << 16) + ((str[2] & 0x3f) << 10)
191 + ((str[4] & 0x0f) << 6) + (str[5] & 0x3f);
192 }
193
194
195 //-------------------------------------------------------------------------------------
196
197
198 int UNICODE::utf8_size(jchar c) {
199 if ((0x0001 <= c) && (c <= 0x007F)) return 1;
200 if (c <= 0x07FF) return 2;
201 return 3;
202 }
203
204 int UNICODE::utf8_length(jchar* base, int length) {
205 int result = 0;
206 for (int index = 0; index < length; index++) {
207 jchar c = base[index];
208 if ((0x0001 <= c) && (c <= 0x007F)) result += 1;
209 else if (c <= 0x07FF) result += 2;
210 else result += 3;
211 }
212 return result;
213 }
214
215 char* UNICODE::as_utf8(jchar* base, int length) {
216 int utf8_len = utf8_length(base, length);
217 u_char* result = NEW_RESOURCE_ARRAY(u_char, utf8_len + 1);
218 u_char* p = result;
219 for (int index = 0; index < length; index++) {
220 p = utf8_write(p, base[index]);
221 }
222 *p = '\0';
223 assert(p == &result[utf8_len], "length prediction must be correct");
224 return (char*) result;
225 }
226
227 char* UNICODE::as_utf8(jchar* base, int length, char* buf, int buflen) {
228 u_char* p = (u_char*)buf;
229 u_char* end = (u_char*)buf + buflen;
230 for (int index = 0; index < length; index++) {
231 jchar c = base[index];
232 if (p + utf8_size(c) >= end) break; // string is truncated
233 p = utf8_write(p, base[index]);
234 }
235 *p = '\0';
236 return buf;
237 }
238
239 void UNICODE::convert_to_utf8(const jchar* base, int length, char* utf8_buffer) {
240 for(int index = 0; index < length; index++) {
241 utf8_buffer = (char*)utf8_write((u_char*)utf8_buffer, base[index]);
242 }
243 *utf8_buffer = '\0';
244 }