0
|
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 }
|