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_utf7imap.h"
36 :
37 : const mbfl_encoding mbfl_encoding_utf7imap = {
38 : mbfl_no_encoding_utf7imap,
39 : "UTF7-IMAP",
40 : NULL,
41 : NULL,
42 : NULL,
43 : MBFL_ENCTYPE_MBCS | MBFL_ENCTYPE_SHFTCODE
44 : };
45 :
46 : const struct mbfl_convert_vtbl vtbl_utf7imap_wchar = {
47 : mbfl_no_encoding_utf7imap,
48 : mbfl_no_encoding_wchar,
49 : mbfl_filt_conv_common_ctor,
50 : mbfl_filt_conv_common_dtor,
51 : mbfl_filt_conv_utf7imap_wchar,
52 : mbfl_filt_conv_common_flush };
53 :
54 : const struct mbfl_convert_vtbl vtbl_wchar_utf7imap = {
55 : mbfl_no_encoding_wchar,
56 : mbfl_no_encoding_utf7imap,
57 : mbfl_filt_conv_common_ctor,
58 : mbfl_filt_conv_common_dtor,
59 : mbfl_filt_conv_wchar_utf7imap,
60 : mbfl_filt_conv_wchar_utf7imap_flush };
61 :
62 : #define CK(statement) do { if ((statement) < 0) return (-1); } while (0)
63 :
64 : /*
65 : * UTF7-IMAP => wchar
66 : */
67 : int mbfl_filt_conv_utf7imap_wchar(int c, mbfl_convert_filter *filter)
68 81 : {
69 : int s, n;
70 :
71 81 : n = -1;
72 81 : if (filter->status != 0) { /* Modified Base64 */
73 0 : if (c >= 0x41 && c <= 0x5a) { /* A - Z */
74 0 : n = c - 65;
75 0 : } else if (c >= 0x61 && c <= 0x7a) { /* a - z */
76 0 : n = c - 71;
77 0 : } else if (c >= 0x30 && c <= 0x39) { /* 0 - 9 */
78 0 : n = c + 4;
79 0 : } else if (c == 0x2b) { /* '+' */
80 0 : n = 62;
81 0 : } else if (c == 0x2c) { /* ',' */
82 0 : n = 63;
83 : }
84 0 : if (n < 0 || n > 63) {
85 0 : if (c == 0x2d) {
86 0 : if (filter->status == 1) { /* "&-" -> "&" */
87 0 : CK((*filter->output_function)(0x26, filter->data));
88 : }
89 0 : } else if (c >= 0 && c < 0x80) { /* ASCII exclude '-' */
90 0 : CK((*filter->output_function)(c, filter->data));
91 : } else { /* illegal character */
92 0 : s = c & MBFL_WCSGROUP_MASK;
93 0 : s |= MBFL_WCSGROUP_THROUGH;
94 0 : CK((*filter->output_function)(s, filter->data));
95 : }
96 0 : filter->cache = 0;
97 0 : filter->status = 0;
98 0 : return c;
99 : }
100 : }
101 :
102 81 : switch (filter->status) {
103 : /* directly encoded characters */
104 : case 0:
105 81 : if (c == 0x26) { /* '&' shift character */
106 0 : filter->status++;
107 94 : } else if (c >= 0 && c < 0x80) { /* ASCII */
108 14 : CK((*filter->output_function)(c, filter->data));
109 : } else { /* illegal character */
110 67 : s = c & MBFL_WCSGROUP_MASK;
111 67 : s |= MBFL_WCSGROUP_THROUGH;
112 67 : CK((*filter->output_function)(s, filter->data));
113 : }
114 79 : break;
115 :
116 : /* decode Modified Base64 */
117 : case 1:
118 : case 2:
119 0 : filter->cache |= n << 10;
120 0 : filter->status = 3;
121 0 : break;
122 : case 3:
123 0 : filter->cache |= n << 4;
124 0 : filter->status = 4;
125 0 : break;
126 : case 4:
127 0 : s = ((n >> 2) & 0xf) | (filter->cache & 0xffff);
128 0 : n = (n & 0x3) << 14;
129 0 : filter->status = 5;
130 0 : if (s >= 0xd800 && s < 0xdc00) {
131 0 : s = (((s & 0x3ff) << 16) + 0x400000) | n;
132 0 : filter->cache = s;
133 0 : } else if (s >= 0xdc00 && s < 0xe000) {
134 0 : s &= 0x3ff;
135 0 : s |= (filter->cache & 0xfff0000) >> 6;
136 0 : filter->cache = n;
137 0 : if (s >= MBFL_WCSPLANE_SUPMIN && s < MBFL_WCSPLANE_SUPMAX) {
138 0 : CK((*filter->output_function)(s, filter->data));
139 : } else { /* illegal character */
140 0 : s &= MBFL_WCSGROUP_MASK;
141 0 : s |= MBFL_WCSGROUP_THROUGH;
142 0 : CK((*filter->output_function)(s, filter->data));
143 : }
144 : } else {
145 0 : filter->cache = n;
146 0 : CK((*filter->output_function)(s, filter->data));
147 : }
148 0 : break;
149 :
150 : case 5:
151 0 : filter->cache |= n << 8;
152 0 : filter->status = 6;
153 0 : break;
154 : case 6:
155 0 : filter->cache |= n << 2;
156 0 : filter->status = 7;
157 0 : break;
158 : case 7:
159 0 : s = ((n >> 4) & 0x3) | (filter->cache & 0xffff);
160 0 : n = (n & 0xf) << 12;
161 0 : filter->status = 8;
162 0 : if (s >= 0xd800 && s < 0xdc00) {
163 0 : s = (((s & 0x3ff) << 16) + 0x400000) | n;
164 0 : filter->cache = s;
165 0 : } else if (s >= 0xdc00 && s < 0xe000) {
166 0 : s &= 0x3ff;
167 0 : s |= (filter->cache & 0xfff0000) >> 6;
168 0 : filter->cache = n;
169 0 : if (s >= MBFL_WCSPLANE_SUPMIN && s < MBFL_WCSPLANE_SUPMAX) {
170 0 : CK((*filter->output_function)(s, filter->data));
171 : } else { /* illegal character */
172 0 : s &= MBFL_WCSGROUP_MASK;
173 0 : s |= MBFL_WCSGROUP_THROUGH;
174 0 : CK((*filter->output_function)(s, filter->data));
175 : }
176 : } else {
177 0 : filter->cache = n;
178 0 : CK((*filter->output_function)(s, filter->data));
179 : }
180 0 : break;
181 :
182 : case 8:
183 0 : filter->cache |= n << 6;
184 0 : filter->status = 9;
185 0 : break;
186 : case 9:
187 0 : s = n | (filter->cache & 0xffff);
188 0 : filter->status = 2;
189 0 : if (s >= 0xd800 && s < 0xdc00) {
190 0 : s = (((s & 0x3ff) << 16) + 0x400000);
191 0 : filter->cache = s;
192 0 : } else if (s >= 0xdc00 && s < 0xe000) {
193 0 : s &= 0x3ff;
194 0 : s |= (filter->cache & 0xfff0000) >> 6;
195 0 : filter->cache = 0;
196 0 : if (s >= MBFL_WCSPLANE_SUPMIN && s < MBFL_WCSPLANE_SUPMAX) {
197 0 : CK((*filter->output_function)(s, filter->data));
198 : } else { /* illegal character */
199 0 : s &= MBFL_WCSGROUP_MASK;
200 0 : s |= MBFL_WCSGROUP_THROUGH;
201 0 : CK((*filter->output_function)(s, filter->data));
202 : }
203 : } else {
204 0 : filter->cache = 0;
205 0 : CK((*filter->output_function)(s, filter->data));
206 : }
207 0 : break;
208 :
209 : default:
210 0 : filter->status = 0;
211 : break;
212 : }
213 :
214 79 : return c;
215 : }
216 :
217 : static const unsigned char mbfl_utf7imap_base64_table[] =
218 : {
219 : /* 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', */
220 : 0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,0x4b,0x4c,0x4d,
221 : /* 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', */
222 : 0x4e,0x4f,0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,
223 : /* 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', */
224 : 0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6c,0x6d,
225 : /* 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', */
226 : 0x6e,0x6f,0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,
227 : /* '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', ',', '\0' */
228 : 0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x2b,0x2c,0x00
229 : };
230 :
231 : /*
232 : * wchar => UTF7-IMAP
233 : */
234 : int mbfl_filt_conv_wchar_utf7imap(int c, mbfl_convert_filter *filter)
235 15 : {
236 : int n, s;
237 :
238 15 : n = 0;
239 15 : if (c == 0x26) {
240 0 : n = 1;
241 25 : } else if ((c >= 0x20 && c <= 0x7e) || c == 0) {
242 10 : n = 2;
243 5 : } else if (c >= 0 && c < MBFL_WCSPLANE_UCS2MAX) {
244 : ;
245 5 : } else if (c >= MBFL_WCSPLANE_SUPMIN && c < MBFL_WCSPLANE_SUPMAX) {
246 0 : s = ((c >> 10) - 0x40) | 0xd800;
247 0 : CK((*filter->filter_function)(s, filter));
248 0 : s = (c & 0x3ff) | 0xdc00;
249 0 : CK((*filter->filter_function)(s, filter));
250 0 : return c;
251 : } else {
252 5 : if (filter->illegal_mode != MBFL_OUTPUTFILTER_ILLEGAL_MODE_NONE) {
253 5 : CK(mbfl_filt_conv_illegal_output(c, filter));
254 : }
255 5 : return c;
256 : }
257 :
258 10 : switch (filter->status) {
259 : case 0:
260 10 : if (n != 0) { /* directly encode characters */
261 10 : CK((*filter->output_function)(c, filter->data));
262 10 : if (n == 1) {
263 0 : CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
264 : }
265 : } else { /* Modified Base64 */
266 0 : CK((*filter->output_function)(0x26, filter->data)); /* '&' */
267 0 : filter->status = 1;
268 0 : filter->cache = c;
269 : }
270 10 : break;
271 :
272 : /* encode Modified Base64 */
273 : case 1:
274 0 : s = filter->cache;
275 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 10) & 0x3f], filter->data));
276 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 4) & 0x3f], filter->data));
277 0 : if (n != 0) {
278 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s << 2) & 0x3c], filter->data));
279 0 : CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
280 0 : CK((*filter->output_function)(c, filter->data));
281 0 : if (n == 1) {
282 0 : CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
283 : }
284 0 : filter->status = 0;
285 : } else {
286 0 : filter->status = 2;
287 0 : filter->cache = ((s & 0xf) << 16) | c;
288 : }
289 0 : break;
290 :
291 : case 2:
292 0 : s = filter->cache;
293 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 14) & 0x3f], filter->data));
294 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 8) & 0x3f], filter->data));
295 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 2) & 0x3f], filter->data));
296 0 : if (n != 0) {
297 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s << 4) & 0x30], filter->data));
298 0 : CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
299 0 : CK((*filter->output_function)(c, filter->data));
300 0 : if (n == 1) {
301 0 : CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
302 : }
303 0 : filter->status = 0;
304 : } else {
305 0 : filter->status = 3;
306 0 : filter->cache = ((s & 0x3) << 16) | c;
307 : }
308 0 : break;
309 :
310 : case 3:
311 0 : s = filter->cache;
312 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 12) & 0x3f], filter->data));
313 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[(s >> 6) & 0x3f], filter->data));
314 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[s & 0x3f], filter->data));
315 0 : if (n != 0) {
316 0 : CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
317 0 : CK((*filter->output_function)(c, filter->data));
318 0 : if (n == 1) {
319 0 : CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
320 : }
321 0 : filter->status = 0;
322 : } else {
323 0 : filter->status = 1;
324 0 : filter->cache = c;
325 : }
326 0 : break;
327 :
328 : default:
329 0 : filter->status = 0;
330 : break;
331 : }
332 :
333 10 : return c;
334 :
335 : }
336 :
337 : int mbfl_filt_conv_wchar_utf7imap_flush(mbfl_convert_filter *filter)
338 2 : {
339 : int status, cache;
340 :
341 2 : status = filter->status;
342 2 : cache = filter->cache;
343 2 : filter->status = 0;
344 2 : filter->cache = 0;
345 : /* flush fragments */
346 2 : switch (status) {
347 : case 1:
348 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 10) & 0x3f], filter->data));
349 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 4) & 0x3f], filter->data));
350 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache << 2) & 0x3c], filter->data));
351 0 : CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
352 0 : break;
353 :
354 : case 2:
355 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 14) & 0x3f], filter->data));
356 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 8) & 0x3f], filter->data));
357 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 2) & 0x3f], filter->data));
358 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache << 4) & 0x30], filter->data));
359 0 : CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
360 0 : break;
361 :
362 : case 3:
363 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 12) & 0x3f], filter->data));
364 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[(cache >> 6) & 0x3f], filter->data));
365 0 : CK((*filter->output_function)(mbfl_utf7imap_base64_table[cache & 0x3f], filter->data));
366 0 : CK((*filter->output_function)(0x2d, filter->data)); /* '-' */
367 : break;
368 : }
369 2 : return 0;
370 : }
371 :
372 :
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