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