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 #include "mbfilter.h"
31 #include "mbfilter_ucs4.h"
32
33 static const char *mbfl_encoding_ucs4_aliases[] = {"ISO-10646-UCS-4", "UCS4", NULL};
34
35 const mbfl_encoding mbfl_encoding_ucs4 = {
36 mbfl_no_encoding_ucs4,
37 "UCS-4",
38 "UCS-4",
39 (const char *(*)[])&mbfl_encoding_ucs4_aliases,
40 NULL,
41 MBFL_ENCTYPE_WCS4BE,
42 &vtbl_ucs4_wchar,
43 &vtbl_wchar_ucs4
44 };
45
46 const mbfl_encoding mbfl_encoding_ucs4be = {
47 mbfl_no_encoding_ucs4be,
48 "UCS-4BE",
49 "UCS-4BE",
50 NULL,
51 NULL,
52 MBFL_ENCTYPE_WCS4BE,
53 &vtbl_ucs4be_wchar,
54 &vtbl_wchar_ucs4be
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 &vtbl_ucs4le_wchar,
65 &vtbl_wchar_ucs4le
66 };
67
68 const struct mbfl_convert_vtbl vtbl_ucs4_wchar = {
69 mbfl_no_encoding_ucs4,
70 mbfl_no_encoding_wchar,
71 mbfl_filt_conv_common_ctor,
72 NULL,
73 mbfl_filt_conv_ucs4_wchar,
74 mbfl_filt_conv_common_flush,
75 NULL,
76 };
77
78 const struct mbfl_convert_vtbl vtbl_wchar_ucs4 = {
79 mbfl_no_encoding_wchar,
80 mbfl_no_encoding_ucs4,
81 mbfl_filt_conv_common_ctor,
82 NULL,
83 mbfl_filt_conv_wchar_ucs4be,
84 mbfl_filt_conv_common_flush,
85 NULL,
86 };
87
88 const struct mbfl_convert_vtbl vtbl_ucs4be_wchar = {
89 mbfl_no_encoding_ucs4be,
90 mbfl_no_encoding_wchar,
91 mbfl_filt_conv_common_ctor,
92 NULL,
93 mbfl_filt_conv_ucs4be_wchar,
94 mbfl_filt_conv_common_flush,
95 NULL,
96 };
97
98 const struct mbfl_convert_vtbl vtbl_wchar_ucs4be = {
99 mbfl_no_encoding_wchar,
100 mbfl_no_encoding_ucs4be,
101 mbfl_filt_conv_common_ctor,
102 NULL,
103 mbfl_filt_conv_wchar_ucs4be,
104 mbfl_filt_conv_common_flush,
105 NULL,
106 };
107
108 const struct mbfl_convert_vtbl vtbl_ucs4le_wchar = {
109 mbfl_no_encoding_ucs4le,
110 mbfl_no_encoding_wchar,
111 mbfl_filt_conv_common_ctor,
112 NULL,
113 mbfl_filt_conv_ucs4le_wchar,
114 mbfl_filt_conv_common_flush,
115 NULL,
116 };
117
118 const struct mbfl_convert_vtbl vtbl_wchar_ucs4le = {
119 mbfl_no_encoding_wchar,
120 mbfl_no_encoding_ucs4le,
121 mbfl_filt_conv_common_ctor,
122 NULL,
123 mbfl_filt_conv_wchar_ucs4le,
124 mbfl_filt_conv_common_flush,
125 NULL,
126 };
127
128
129 #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
130
131 /*
132 * UCS-4 => wchar
133 */
mbfl_filt_conv_ucs4_wchar(int c,mbfl_convert_filter * filter)134 int mbfl_filt_conv_ucs4_wchar(int c, mbfl_convert_filter *filter)
135 {
136 int n, endian;
137
138 endian = filter->status & 0xff00;
139 switch (filter->status & 0xff) {
140 case 0:
141 if (endian) {
142 n = c & 0xff;
143 } else {
144 n = (c & 0xffu) << 24;
145 }
146 filter->cache = n;
147 filter->status++;
148 break;
149 case 1:
150 if (endian) {
151 n = (c & 0xff) << 8;
152 } else {
153 n = (c & 0xff) << 16;
154 }
155 filter->cache |= n;
156 filter->status++;
157 break;
158 case 2:
159 if (endian) {
160 n = (c & 0xff) << 16;
161 } else {
162 n = (c & 0xff) << 8;
163 }
164 filter->cache |= n;
165 filter->status++;
166 break;
167 default:
168 if (endian) {
169 n = (c & 0xffu) << 24;
170 } else {
171 n = c & 0xff;
172 }
173 n |= filter->cache;
174 if ((n & 0xffff) == 0 && ((n >> 16) & 0xffff) == 0xfffe) {
175 if (endian) {
176 filter->status = 0; /* big-endian */
177 } else {
178 filter->status = 0x100; /* little-endian */
179 }
180 CK((*filter->output_function)(0xfeff, filter->data));
181 } else {
182 filter->status &= ~0xff;
183 CK((*filter->output_function)(n, filter->data));
184 }
185 break;
186 }
187
188 return c;
189 }
190
191 /*
192 * UCS-4BE => wchar
193 */
mbfl_filt_conv_ucs4be_wchar(int c,mbfl_convert_filter * filter)194 int mbfl_filt_conv_ucs4be_wchar(int c, mbfl_convert_filter *filter)
195 {
196 int n;
197
198 if (filter->status == 0) {
199 filter->status = 1;
200 n = (c & 0xffu) << 24;
201 filter->cache = n;
202 } else if (filter->status == 1) {
203 filter->status = 2;
204 n = (c & 0xff) << 16;
205 filter->cache |= n;
206 } else if (filter->status == 2) {
207 filter->status = 3;
208 n = (c & 0xff) << 8;
209 filter->cache |= n;
210 } else {
211 filter->status = 0;
212 n = (c & 0xff) | filter->cache;
213 CK((*filter->output_function)(n, filter->data));
214 }
215 return c;
216 }
217
218 /*
219 * wchar => UCS-4BE
220 */
mbfl_filt_conv_wchar_ucs4be(int c,mbfl_convert_filter * filter)221 int mbfl_filt_conv_wchar_ucs4be(int c, mbfl_convert_filter *filter)
222 {
223 if (c >= 0 && c < MBFL_WCSGROUP_UCS4MAX) {
224 CK((*filter->output_function)((c >> 24) & 0xff, filter->data));
225 CK((*filter->output_function)((c >> 16) & 0xff, filter->data));
226 CK((*filter->output_function)((c >> 8) & 0xff, filter->data));
227 CK((*filter->output_function)(c & 0xff, filter->data));
228 } else {
229 CK(mbfl_filt_conv_illegal_output(c, filter));
230 }
231
232 return c;
233 }
234
235 /*
236 * UCS-4LE => wchar
237 */
mbfl_filt_conv_ucs4le_wchar(int c,mbfl_convert_filter * filter)238 int mbfl_filt_conv_ucs4le_wchar(int c, mbfl_convert_filter *filter)
239 {
240 int n;
241
242 if (filter->status == 0) {
243 filter->status = 1;
244 n = (c & 0xff);
245 filter->cache = n;
246 } else if (filter->status == 1) {
247 filter->status = 2;
248 n = (c & 0xff) << 8;
249 filter->cache |= n;
250 } else if (filter->status == 2) {
251 filter->status = 3;
252 n = (c & 0xff) << 16;
253 filter->cache |= n;
254 } else {
255 filter->status = 0;
256 n = ((c & 0xffu) << 24) | filter->cache;
257 CK((*filter->output_function)(n, filter->data));
258 }
259 return c;
260 }
261
262 /*
263 * wchar => UCS-4LE
264 */
mbfl_filt_conv_wchar_ucs4le(int c,mbfl_convert_filter * filter)265 int mbfl_filt_conv_wchar_ucs4le(int c, mbfl_convert_filter *filter)
266 {
267 if (c >= 0 && c < MBFL_WCSGROUP_UCS4MAX) {
268 CK((*filter->output_function)(c & 0xff, filter->data));
269 CK((*filter->output_function)((c >> 8) & 0xff, filter->data));
270 CK((*filter->output_function)((c >> 16) & 0xff, filter->data));
271 CK((*filter->output_function)((c >> 24) & 0xff, filter->data));
272 } else {
273 CK(mbfl_filt_conv_illegal_output(c, filter));
274 }
275
276 return c;
277 }
278
