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 20 dec 2002.
27 *
28 */
29
30 #ifdef HAVE_CONFIG_H
31 #include "config.h"
32 #endif
33
34 #include "mbfilter.h"
35 #include "mbfilter_utf32.h"
36
37 static const char *mbfl_encoding_utf32_aliases[] = {"utf32", NULL};
38
39 const mbfl_encoding mbfl_encoding_utf32 = {
40 mbfl_no_encoding_utf32,
41 "UTF-32",
42 "UTF-32",
43 (const char *(*)[])&mbfl_encoding_utf32_aliases,
44 NULL,
45 MBFL_ENCTYPE_WCS4BE,
46 &vtbl_utf32_wchar,
47 &vtbl_wchar_utf32
48 };
49
50 const mbfl_encoding mbfl_encoding_utf32be = {
51 mbfl_no_encoding_utf32be,
52 "UTF-32BE",
53 "UTF-32BE",
54 NULL,
55 NULL,
56 MBFL_ENCTYPE_WCS4BE,
57 &vtbl_utf32be_wchar,
58 &vtbl_wchar_utf32be
59 };
60
61 const mbfl_encoding mbfl_encoding_utf32le = {
62 mbfl_no_encoding_utf32le,
63 "UTF-32LE",
64 "UTF-32LE",
65 NULL,
66 NULL,
67 MBFL_ENCTYPE_WCS4LE,
68 &vtbl_utf32le_wchar,
69 &vtbl_wchar_utf32le
70 };
71
72 const struct mbfl_convert_vtbl vtbl_utf32_wchar = {
73 mbfl_no_encoding_utf32,
74 mbfl_no_encoding_wchar,
75 mbfl_filt_conv_common_ctor,
76 mbfl_filt_conv_common_dtor,
77 mbfl_filt_conv_utf32_wchar,
78 mbfl_filt_conv_common_flush
79 };
80
81 const struct mbfl_convert_vtbl vtbl_wchar_utf32 = {
82 mbfl_no_encoding_wchar,
83 mbfl_no_encoding_utf32,
84 mbfl_filt_conv_common_ctor,
85 mbfl_filt_conv_common_dtor,
86 mbfl_filt_conv_wchar_utf32be,
87 mbfl_filt_conv_common_flush
88 };
89
90 const struct mbfl_convert_vtbl vtbl_utf32be_wchar = {
91 mbfl_no_encoding_utf32be,
92 mbfl_no_encoding_wchar,
93 mbfl_filt_conv_common_ctor,
94 mbfl_filt_conv_common_dtor,
95 mbfl_filt_conv_utf32be_wchar,
96 mbfl_filt_conv_common_flush
97 };
98
99 const struct mbfl_convert_vtbl vtbl_wchar_utf32be = {
100 mbfl_no_encoding_wchar,
101 mbfl_no_encoding_utf32be,
102 mbfl_filt_conv_common_ctor,
103 mbfl_filt_conv_common_dtor,
104 mbfl_filt_conv_wchar_utf32be,
105 mbfl_filt_conv_common_flush
106 };
107
108 const struct mbfl_convert_vtbl vtbl_utf32le_wchar = {
109 mbfl_no_encoding_utf32le,
110 mbfl_no_encoding_wchar,
111 mbfl_filt_conv_common_ctor,
112 mbfl_filt_conv_common_dtor,
113 mbfl_filt_conv_utf32le_wchar,
114 mbfl_filt_conv_common_flush
115 };
116
117 const struct mbfl_convert_vtbl vtbl_wchar_utf32le = {
118 mbfl_no_encoding_wchar,
119 mbfl_no_encoding_utf32le,
120 mbfl_filt_conv_common_ctor,
121 mbfl_filt_conv_common_dtor,
122 mbfl_filt_conv_wchar_utf32le,
123 mbfl_filt_conv_common_flush
124 };
125
126 #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
127
128 /*
129 * UTF-32 => wchar
130 */
mbfl_filt_conv_utf32_wchar(int c,mbfl_convert_filter * filter)131 int mbfl_filt_conv_utf32_wchar(int c, mbfl_convert_filter *filter)
132 {
133 int n, endian;
134
135 endian = filter->status & 0xff00;
136 switch (filter->status & 0xff) {
137 case 0:
138 if (endian) {
139 n = c & 0xff;
140 } else {
141 n = (c & 0xffu) << 24;
142 }
143 filter->cache = n;
144 filter->status++;
145 break;
146 case 1:
147 if (endian) {
148 n = (c & 0xff) << 8;
149 } else {
150 n = (c & 0xff) << 16;
151 }
152 filter->cache |= n;
153 filter->status++;
154 break;
155 case 2:
156 if (endian) {
157 n = (c & 0xff) << 16;
158 } else {
159 n = (c & 0xff) << 8;
160 }
161 filter->cache |= n;
162 filter->status++;
163 break;
164 default:
165 if (endian) {
166 n = (c & 0xffu) << 24;
167 } else {
168 n = c & 0xff;
169 }
170 n |= filter->cache;
171 if ((n & 0xffff) == 0 && ((n >> 16) & 0xffff) == 0xfffe) {
172 if (endian) {
173 filter->status = 0; /* big-endian */
174 } else {
175 filter->status = 0x100; /* little-endian */
176 }
177 CK((*filter->output_function)(0xfeff, filter->data));
178 } else {
179 filter->status &= ~0xff;
180 if (n < MBFL_WCSPLANE_UTF32MAX && (n < 0xd800 || n > 0xdfff)) {
181 CK((*filter->output_function)(n, filter->data));
182 } else {
183 n = (n & MBFL_WCSGROUP_MASK) | MBFL_WCSGROUP_THROUGH;
184 CK((*filter->output_function)(n, filter->data));
185 }
186 }
187 break;
188 }
189
190 return c;
191 }
192
193 /*
194 * UTF-32BE => wchar
195 */
mbfl_filt_conv_utf32be_wchar(int c,mbfl_convert_filter * filter)196 int mbfl_filt_conv_utf32be_wchar(int c, mbfl_convert_filter *filter)
197 {
198 int n;
199
200 if (filter->status == 0) {
201 filter->status = 1;
202 n = (c & 0xffu) << 24;
203 filter->cache = n;
204 } else if (filter->status == 1) {
205 filter->status = 2;
206 n = (c & 0xff) << 16;
207 filter->cache |= n;
208 } else if (filter->status == 2) {
209 filter->status = 3;
210 n = (c & 0xff) << 8;
211 filter->cache |= n;
212 } else {
213 filter->status = 0;
214 n = (c & 0xff) | filter->cache;
215 if (n < MBFL_WCSPLANE_UTF32MAX && (n < 0xd800 || n > 0xdfff)) {
216 CK((*filter->output_function)(n, filter->data));
217 } else {
218 n = (n & MBFL_WCSGROUP_MASK) | MBFL_WCSGROUP_THROUGH;
219 CK((*filter->output_function)(n, filter->data));
220 }
221 }
222 return c;
223 }
224
225 /*
226 * wchar => UTF-32BE
227 */
mbfl_filt_conv_wchar_utf32be(int c,mbfl_convert_filter * filter)228 int mbfl_filt_conv_wchar_utf32be(int c, mbfl_convert_filter *filter)
229 {
230 if (c >= 0 && c < MBFL_WCSPLANE_UTF32MAX) {
231 CK((*filter->output_function)((c >> 24) & 0xff, filter->data));
232 CK((*filter->output_function)((c >> 16) & 0xff, filter->data));
233 CK((*filter->output_function)((c >> 8) & 0xff, filter->data));
234 CK((*filter->output_function)(c & 0xff, filter->data));
235 } else {
236 CK(mbfl_filt_conv_illegal_output(c, filter));
237 }
238
239 return c;
240 }
241
242 /*
243 * UTF-32LE => wchar
244 */
mbfl_filt_conv_utf32le_wchar(int c,mbfl_convert_filter * filter)245 int mbfl_filt_conv_utf32le_wchar(int c, mbfl_convert_filter *filter)
246 {
247 int n;
248
249 if (filter->status == 0) {
250 filter->status = 1;
251 n = (c & 0xff);
252 filter->cache = n;
253 } else if (filter->status == 1) {
254 filter->status = 2;
255 n = (c & 0xff) << 8;
256 filter->cache |= n;
257 } else if (filter->status == 2) {
258 filter->status = 3;
259 n = (c & 0xff) << 16;
260 filter->cache |= n;
261 } else {
262 filter->status = 0;
263 n = ((c & 0xffu) << 24) | filter->cache;
264 if (n < MBFL_WCSPLANE_UTF32MAX && (n < 0xd800 || n > 0xdfff)) {
265 CK((*filter->output_function)(n, filter->data));
266 } else {
267 n = (n & MBFL_WCSGROUP_MASK) | MBFL_WCSGROUP_THROUGH;
268 CK((*filter->output_function)(n, filter->data));
269 }
270 }
271 return c;
272 }
273
274 /*
275 * wchar => UTF-32LE
276 */
mbfl_filt_conv_wchar_utf32le(int c,mbfl_convert_filter * filter)277 int mbfl_filt_conv_wchar_utf32le(int c, mbfl_convert_filter *filter)
278 {
279 if (c >= 0 && c < MBFL_WCSPLANE_UTF32MAX) {
280 CK((*filter->output_function)(c & 0xff, filter->data));
281 CK((*filter->output_function)((c >> 8) & 0xff, filter->data));
282 CK((*filter->output_function)((c >> 16) & 0xff, filter->data));
283 CK((*filter->output_function)((c >> 24) & 0xff, filter->data));
284 } else {
285 CK(mbfl_filt_conv_illegal_output(c, filter));
286 }
287
288 return c;
289 }
290
