1 /*
2 * "streamable kanji code filter and converter"
3 * Copyright (c) 1998-2002 HappySize, Inc. All rights reserved.
4 *
5 * LICENSE NOTICES
6 *
7 * This file is part of "streamable kanji code filter and converter",
8 * which is distributed under the terms of GNU Lesser General Public
9 * License (version 2) as published by the Free Software Foundation.
10 *
11 * This software is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with "streamable kanji code filter and converter";
18 * if not, write to the Free Software Foundation, Inc., 59 Temple Place,
19 * Suite 330, Boston, MA 02111-1307 USA
20 *
21 * The author of this file:
22 *
23 */
24 /*
25 * The source code included in this files was separated from mbfilter.c
26 * by moriyoshi koizumi <moriyoshi@php.net> on 4 dec 2002.
27 *
28 */
29
30 #ifdef HAVE_CONFIG_H
31 #include "config.h"
32 #endif
33
34 #include "mbfilter.h"
35 #include "mbfilter_utf8.h"
36
37 static int mbfl_filt_ident_utf8(int c, mbfl_identify_filter *filter);
38
39 static const unsigned char mblen_table_utf8[] = {
40 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
41 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
42 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
43 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
44 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
45 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
46 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
47 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
48 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
49 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
50 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
51 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
52 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
53 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
54 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
55 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 1, 1
56 };
57
58 static const char *mbfl_encoding_utf8_aliases[] = {"utf8", NULL};
59
60 const mbfl_encoding mbfl_encoding_utf8 = {
61 mbfl_no_encoding_utf8,
62 "UTF-8",
63 "UTF-8",
64 (const char *(*)[])&mbfl_encoding_utf8_aliases,
65 mblen_table_utf8,
66 MBFL_ENCTYPE_MBCS
67 };
68
69 const struct mbfl_identify_vtbl vtbl_identify_utf8 = {
70 mbfl_no_encoding_utf8,
71 mbfl_filt_ident_common_ctor,
72 mbfl_filt_ident_common_dtor,
73 mbfl_filt_ident_utf8
74 };
75
76 const struct mbfl_convert_vtbl vtbl_utf8_wchar = {
77 mbfl_no_encoding_utf8,
78 mbfl_no_encoding_wchar,
79 mbfl_filt_conv_common_ctor,
80 mbfl_filt_conv_common_dtor,
81 mbfl_filt_conv_utf8_wchar,
82 mbfl_filt_conv_common_flush
83 };
84
85 const struct mbfl_convert_vtbl vtbl_wchar_utf8 = {
86 mbfl_no_encoding_wchar,
87 mbfl_no_encoding_utf8,
88 mbfl_filt_conv_common_ctor,
89 mbfl_filt_conv_common_dtor,
90 mbfl_filt_conv_wchar_utf8,
91 mbfl_filt_conv_common_flush
92 };
93
94 #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
95
96 /*
97 * UTF-8 => wchar
98 */
mbfl_filt_conv_utf8_wchar(int c,mbfl_convert_filter * filter)99 int mbfl_filt_conv_utf8_wchar(int c, mbfl_convert_filter *filter)
100 {
101 int s;
102
103 if (c < 0x80) {
104 if (c >= 0) {
105 CK((*filter->output_function)(c, filter->data));
106 }
107 filter->status = 0;
108 } else if (c < 0xc0) {
109 int status = filter->status & 0xff;
110 switch (status) {
111 case 0x10: /* 2byte code 2nd char */
112 case 0x21: /* 3byte code 3rd char */
113 case 0x32: /* 4byte code 4th char */
114 case 0x43: /* 5byte code 5th char */
115 case 0x54: /* 6byte code 6th char */
116 filter->status = 0;
117 s = filter->cache | (c & 0x3f);
118 if ((status == 0x10 && s >= 0x80) ||
119 (status == 0x21 && s >= 0x800 && (s < 0xd800 || s > 0xdfff)) ||
120 (status == 0x32 && s >= 0x10000) ||
121 (status == 0x43 && s >= 0x200000) ||
122 (status == 0x54 && s >= 0x4000000 && s < MBFL_WCSGROUP_UCS4MAX)) {
123 CK((*filter->output_function)(s, filter->data));
124 }
125 break;
126 case 0x20: /* 3byte code 2nd char */
127 case 0x31: /* 4byte code 3rd char */
128 case 0x42: /* 5byte code 4th char */
129 case 0x53: /* 6byte code 5th char */
130 filter->cache |= ((c & 0x3f) << 6);
131 filter->status++;
132 break;
133 case 0x30: /* 4byte code 2nd char */
134 case 0x41: /* 5byte code 3rd char */
135 case 0x52: /* 6byte code 4th char */
136 filter->cache |= ((c & 0x3f) << 12);
137 filter->status++;
138 break;
139 case 0x40: /* 5byte code 2nd char */
140 case 0x51: /* 6byte code 3rd char */
141 filter->cache |= ((c & 0x3f) << 18);
142 filter->status++;
143 break;
144 case 0x50: /* 6byte code 2nd char */
145 filter->cache |= ((c & 0x3f) << 24);
146 filter->status++;
147 break;
148 default:
149 filter->status = 0;
150 break;
151 }
152 } else if (c < 0xe0) { /* 2byte code first char */
153 filter->status = 0x10;
154 filter->cache = (c & 0x1f) << 6;
155 } else if (c < 0xf0) { /* 3byte code first char */
156 filter->status = 0x20;
157 filter->cache = (c & 0xf) << 12;
158 } else if (c < 0xf8) { /* 4byte code first char */
159 filter->status = 0x30;
160 filter->cache = (c & 0x7) << 18;
161 } else if (c < 0xfc) { /* 5byte code first char */
162 filter->status = 0x40;
163 filter->cache = (c & 0x3) << 24;
164 } else if (c < 0xfe) { /* 6 byte code first char */
165 filter->status = 0x50;
166 filter->cache = (c & 0x1) << 30;
167 } else {
168 filter->status = 0;
169 filter->cache = 0;
170 }
171
172 return c;
173 }
174
175 /*
176 * wchar => UTF-8
177 */
mbfl_filt_conv_wchar_utf8(int c,mbfl_convert_filter * filter)178 int mbfl_filt_conv_wchar_utf8(int c, mbfl_convert_filter *filter)
179 {
180 if (c >= 0 && c < MBFL_WCSGROUP_UCS4MAX) {
181 if (c < 0x80) {
182 CK((*filter->output_function)(c, filter->data));
183 } else if (c < 0x800) {
184 CK((*filter->output_function)(((c >> 6) & 0x1f) | 0xc0, filter->data));
185 CK((*filter->output_function)((c & 0x3f) | 0x80, filter->data));
186 } else if (c < 0x10000) {
187 CK((*filter->output_function)(((c >> 12) & 0x0f) | 0xe0, filter->data));
188 CK((*filter->output_function)(((c >> 6) & 0x3f) | 0x80, filter->data));
189 CK((*filter->output_function)((c & 0x3f) | 0x80, filter->data));
190 } else if (c < 0x200000) {
191 CK((*filter->output_function)(((c >> 18) & 0x07) | 0xf0, filter->data));
192 CK((*filter->output_function)(((c >> 12) & 0x3f) | 0x80, filter->data));
193 CK((*filter->output_function)(((c >> 6) & 0x3f) | 0x80, filter->data));
194 CK((*filter->output_function)((c & 0x3f) | 0x80, filter->data));
195 } else if (c < 0x4000000) {
196 CK((*filter->output_function)(((c >> 24) & 0x03) | 0xf8, filter->data));
197 CK((*filter->output_function)(((c >> 18) & 0x3f) | 0x80, filter->data));
198 CK((*filter->output_function)(((c >> 12) & 0x3f) | 0x80, filter->data));
199 CK((*filter->output_function)(((c >> 6) & 0x3f) | 0x80, filter->data));
200 CK((*filter->output_function)((c & 0x3f) | 0x80, filter->data));
201 } else {
202 CK((*filter->output_function)(((c >> 30) & 0x01) | 0xfc, filter->data));
203 CK((*filter->output_function)(((c >> 24) & 0x3f) | 0x80, filter->data));
204 CK((*filter->output_function)(((c >> 18) & 0x3f) | 0x80, filter->data));
205 CK((*filter->output_function)(((c >> 12) & 0x3f) | 0x80, filter->data));
206 CK((*filter->output_function)(((c >> 6) & 0x3f) | 0x80, filter->data));
207 CK((*filter->output_function)((c & 0x3f) | 0x80, filter->data));
208 }
209 } else {
210 if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
211 CK(mbfl_filt_conv_illegal_output(c, filter));
212 }
213 }
214
215 return c;
216 }
217
mbfl_filt_ident_utf8(int c,mbfl_identify_filter * filter)218 static int mbfl_filt_ident_utf8(int c, mbfl_identify_filter *filter)
219 {
220 if (c < 0x80) {
221 if (c < 0) {
222 filter->flag = 1; /* bad */
223 } else if (filter->status) {
224 filter->flag = 1; /* bad */
225 }
226 filter->status = 0;
227 } else if (c < 0xc0) {
228 switch (filter->status) {
229 case 0x20: /* 3 byte code 2nd char */
230 case 0x30: /* 4 byte code 2nd char */
231 case 0x31: /* 4 byte code 3rd char */
232 case 0x40: /* 5 byte code 2nd char */
233 case 0x41: /* 5 byte code 3rd char */
234 case 0x42: /* 5 byte code 4th char */
235 case 0x50: /* 6 byte code 2nd char */
236 case 0x51: /* 6 byte code 3rd char */
237 case 0x52: /* 6 byte code 4th char */
238 case 0x53: /* 6 byte code 5th char */
239 filter->status++;
240 break;
241 case 0x10: /* 2 byte code 2nd char */
242 case 0x21: /* 3 byte code 3rd char */
243 case 0x32: /* 4 byte code 4th char */
244 case 0x43: /* 5 byte code 5th char */
245 case 0x54: /* 6 byte code 6th char */
246 filter->status = 0;
247 break;
248 default:
249 filter->flag = 1; /* bad */
250 filter->status = 0;
251 break;
252 }
253 } else {
254 if (filter->status) {
255 filter->flag = 1; /* bad */
256 }
257 filter->status = 0;
258 if (c < 0xe0) { /* 2 byte code first char */
259 filter->status = 0x10;
260 } else if (c < 0xf0) { /* 3 byte code 1st char */
261 filter->status = 0x20;
262 } else if (c < 0xf8) { /* 4 byte code 1st char */
263 filter->status = 0x30;
264 } else if (c < 0xfc) { /* 5 byte code 1st char */
265 filter->status = 0x40;
266 } else if (c < 0xfe) { /* 6 byte code 1st char */
267 filter->status = 0x50;
268 } else {
269 filter->flag = 1; /* bad */
270 }
271 }
272
273 return c;
274 }
275
