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_ucs4.h"
36
37 static const char *mbfl_encoding_ucs4_aliases[] = {"ISO-10646-UCS-4", "UCS4", NULL};
38
39 const mbfl_encoding mbfl_encoding_ucs4 = {
40 mbfl_no_encoding_ucs4,
41 "UCS-4",
42 "UCS-4",
43 (const char *(*)[])&mbfl_encoding_ucs4_aliases,
44 NULL,
45 MBFL_ENCTYPE_WCS4BE
46 };
47
48 const mbfl_encoding mbfl_encoding_ucs4be = {
49 mbfl_no_encoding_ucs4be,
50 "UCS-4BE",
51 "UCS-4BE",
52 NULL,
53 NULL,
54 MBFL_ENCTYPE_WCS4BE
55 };
56
57 const mbfl_encoding mbfl_encoding_ucs4le = {
58 mbfl_no_encoding_ucs4le,
59 "UCS-4LE",
60 "UCS-4LE",
61 NULL,
62 NULL,
63 MBFL_ENCTYPE_WCS4LE
64 };
65
66 const struct mbfl_convert_vtbl vtbl_ucs4_wchar = {
67 mbfl_no_encoding_ucs4,
68 mbfl_no_encoding_wchar,
69 mbfl_filt_conv_common_ctor,
70 mbfl_filt_conv_common_dtor,
71 mbfl_filt_conv_ucs4_wchar,
72 mbfl_filt_conv_common_flush
73 };
74
75 const struct mbfl_convert_vtbl vtbl_wchar_ucs4 = {
76 mbfl_no_encoding_wchar,
77 mbfl_no_encoding_ucs4,
78 mbfl_filt_conv_common_ctor,
79 mbfl_filt_conv_common_dtor,
80 mbfl_filt_conv_wchar_ucs4be,
81 mbfl_filt_conv_common_flush
82 };
83
84 const struct mbfl_convert_vtbl vtbl_ucs4be_wchar = {
85 mbfl_no_encoding_ucs4be,
86 mbfl_no_encoding_wchar,
87 mbfl_filt_conv_common_ctor,
88 mbfl_filt_conv_common_dtor,
89 mbfl_filt_conv_ucs4be_wchar,
90 mbfl_filt_conv_common_flush
91 };
92
93 const struct mbfl_convert_vtbl vtbl_wchar_ucs4be = {
94 mbfl_no_encoding_wchar,
95 mbfl_no_encoding_ucs4be,
96 mbfl_filt_conv_common_ctor,
97 mbfl_filt_conv_common_dtor,
98 mbfl_filt_conv_wchar_ucs4be,
99 mbfl_filt_conv_common_flush
100 };
101
102 const struct mbfl_convert_vtbl vtbl_ucs4le_wchar = {
103 mbfl_no_encoding_ucs4le,
104 mbfl_no_encoding_wchar,
105 mbfl_filt_conv_common_ctor,
106 mbfl_filt_conv_common_dtor,
107 mbfl_filt_conv_ucs4le_wchar,
108 mbfl_filt_conv_common_flush
109 };
110
111 const struct mbfl_convert_vtbl vtbl_wchar_ucs4le = {
112 mbfl_no_encoding_wchar,
113 mbfl_no_encoding_ucs4le,
114 mbfl_filt_conv_common_ctor,
115 mbfl_filt_conv_common_dtor,
116 mbfl_filt_conv_wchar_ucs4le,
117 mbfl_filt_conv_common_flush
118 };
119
120
121 #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
122
123 /*
124 * UCS-4 => wchar
125 */
mbfl_filt_conv_ucs4_wchar(int c,mbfl_convert_filter * filter)126 int mbfl_filt_conv_ucs4_wchar(int c, mbfl_convert_filter *filter)
127 {
128 int n, endian;
129
130 endian = filter->status & 0xff00;
131 switch (filter->status & 0xff) {
132 case 0:
133 if (endian) {
134 n = c & 0xff;
135 } else {
136 n = (c & 0xff) << 24;
137 }
138 filter->cache = n;
139 filter->status++;
140 break;
141 case 1:
142 if (endian) {
143 n = (c & 0xff) << 8;
144 } else {
145 n = (c & 0xff) << 16;
146 }
147 filter->cache |= n;
148 filter->status++;
149 break;
150 case 2:
151 if (endian) {
152 n = (c & 0xff) << 16;
153 } else {
154 n = (c & 0xff) << 8;
155 }
156 filter->cache |= n;
157 filter->status++;
158 break;
159 default:
160 if (endian) {
161 n = (c & 0xff) << 24;
162 } else {
163 n = c & 0xff;
164 }
165 n |= filter->cache;
166 if ((n & 0xffff) == 0 && ((n >> 16) & 0xffff) == 0xfffe) {
167 if (endian) {
168 filter->status = 0; /* big-endian */
169 } else {
170 filter->status = 0x100; /* little-endian */
171 }
172 CK((*filter->output_function)(0xfeff, filter->data));
173 } else {
174 filter->status &= ~0xff;
175 CK((*filter->output_function)(n, filter->data));
176 }
177 break;
178 }
179
180 return c;
181 }
182
183 /*
184 * UCS-4BE => wchar
185 */
mbfl_filt_conv_ucs4be_wchar(int c,mbfl_convert_filter * filter)186 int mbfl_filt_conv_ucs4be_wchar(int c, mbfl_convert_filter *filter)
187 {
188 int n;
189
190 if (filter->status == 0) {
191 filter->status = 1;
192 n = (c & 0xff) << 24;
193 filter->cache = n;
194 } else if (filter->status == 1) {
195 filter->status = 2;
196 n = (c & 0xff) << 16;
197 filter->cache |= n;
198 } else if (filter->status == 2) {
199 filter->status = 3;
200 n = (c & 0xff) << 8;
201 filter->cache |= n;
202 } else {
203 filter->status = 0;
204 n = (c & 0xff) | filter->cache;
205 CK((*filter->output_function)(n, filter->data));
206 }
207 return c;
208 }
209
210 /*
211 * wchar => UCS-4BE
212 */
mbfl_filt_conv_wchar_ucs4be(int c,mbfl_convert_filter * filter)213 int mbfl_filt_conv_wchar_ucs4be(int c, mbfl_convert_filter *filter)
214 {
215 if (c >= 0 && c < MBFL_WCSGROUP_UCS4MAX) {
216 CK((*filter->output_function)((c >> 24) & 0xff, filter->data));
217 CK((*filter->output_function)((c >> 16) & 0xff, filter->data));
218 CK((*filter->output_function)((c >> 8) & 0xff, filter->data));
219 CK((*filter->output_function)(c & 0xff, filter->data));
220 } else {
221 if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
222 CK(mbfl_filt_conv_illegal_output(c, filter));
223 }
224 }
225
226 return c;
227 }
228
229 /*
230 * UCS-4LE => wchar
231 */
mbfl_filt_conv_ucs4le_wchar(int c,mbfl_convert_filter * filter)232 int mbfl_filt_conv_ucs4le_wchar(int c, mbfl_convert_filter *filter)
233 {
234 int n;
235
236 if (filter->status == 0) {
237 filter->status = 1;
238 n = (c & 0xff);
239 filter->cache = n;
240 } else if (filter->status == 1) {
241 filter->status = 2;
242 n = (c & 0xff) << 8;
243 filter->cache |= n;
244 } else if (filter->status == 2) {
245 filter->status = 3;
246 n = (c & 0xff) << 16;
247 filter->cache |= n;
248 } else {
249 filter->status = 0;
250 n = ((c & 0xff) << 24) | filter->cache;
251 CK((*filter->output_function)(n, filter->data));
252 }
253 return c;
254 }
255
256 /*
257 * wchar => UCS-4LE
258 */
mbfl_filt_conv_wchar_ucs4le(int c,mbfl_convert_filter * filter)259 int mbfl_filt_conv_wchar_ucs4le(int c, mbfl_convert_filter *filter)
260 {
261 if (c >= 0 && c < MBFL_WCSGROUP_UCS4MAX) {
262 CK((*filter->output_function)(c & 0xff, filter->data));
263 CK((*filter->output_function)((c >> 8) & 0xff, filter->data));
264 CK((*filter->output_function)((c >> 16) & 0xff, filter->data));
265 CK((*filter->output_function)((c >> 24) & 0xff, filter->data));
266 } else {
267 if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
268 CK(mbfl_filt_conv_illegal_output(c, filter));
269 }
270 }
271
272 return c;
273 }
274
