Commit | Line | Data |
---|---|---|
d9898ee8 | 1 | /* |
8d138742 | 2 | ** Copyright 1998 - 2009 Double Precision, Inc. See COPYING for |
d9898ee8 | 3 | ** distribution information. |
4 | */ | |
5 | ||
6 | ||
7 | #include <stdio.h> | |
8 | #include <ctype.h> | |
9 | #include <string.h> | |
10 | #include <stdlib.h> | |
8d138742 | 11 | #include <errno.h> |
d9898ee8 | 12 | |
13 | #include "rfc822.h" | |
8d138742 | 14 | #include "rfc822hdr.h" |
d9898ee8 | 15 | #include "rfc2047.h" |
8d138742 CE |
16 | #include "../unicode/unicode.h" |
17 | #if LIBIDN | |
18 | #include <idna.h> | |
19 | #include <stringprep.h> | |
20 | #endif | |
d9898ee8 | 21 | |
8d138742 | 22 | static const char rcsid[]="$Id: rfc2047.c,v 1.23 2009/11/18 03:38:50 mrsam Exp $"; |
d9898ee8 | 23 | |
24 | #define RFC2047_ENCODE_FOLDLENGTH 76 | |
25 | ||
26 | static const char xdigit[]="0123456789ABCDEF"; | |
27 | static const char base64tab[]= | |
28 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; | |
29 | ||
8d138742 CE |
30 | static char *a_rfc2047_encode_str(const char *str, const char *charset, |
31 | int isaddress); | |
d9898ee8 | 32 | |
8d138742 CE |
33 | static void rfc2047_encode_header_do(const struct rfc822a *a, |
34 | const char *charset, | |
35 | void (*print_func)(char, void *), | |
36 | void (*print_separator)(const char *, | |
37 | void *), void *ptr) | |
d9898ee8 | 38 | { |
8d138742 CE |
39 | rfc822_print_common(a, &a_rfc2047_encode_str, charset, |
40 | print_func, print_separator, ptr); | |
d9898ee8 | 41 | } |
42 | ||
8d138742 CE |
43 | static char *rfc822_encode_domain_int(const char *pfix, |
44 | size_t pfix_len, | |
45 | const char *domain) | |
d9898ee8 | 46 | { |
8d138742 | 47 | char *q; |
d9898ee8 | 48 | |
8d138742 CE |
49 | #if LIBIDN |
50 | int err; | |
51 | char *p; | |
d9898ee8 | 52 | |
8d138742 | 53 | err=idna_to_ascii_8z(domain, &p, 0); |
d9898ee8 | 54 | |
8d138742 | 55 | if (err != IDNA_SUCCESS) |
d9898ee8 | 56 | { |
8d138742 CE |
57 | errno=EINVAL; |
58 | return NULL; | |
d9898ee8 | 59 | } |
8d138742 CE |
60 | #else |
61 | char *p; | |
d9898ee8 | 62 | |
8d138742 | 63 | p=strdup(domain); |
d9898ee8 | 64 | |
8d138742 CE |
65 | if (!p) |
66 | return NULL; | |
67 | #endif | |
d9898ee8 | 68 | |
8d138742 | 69 | q=malloc(strlen(p)+pfix_len+1); |
d9898ee8 | 70 | |
8d138742 | 71 | if (!q) |
d9898ee8 | 72 | { |
8d138742 CE |
73 | free(p); |
74 | return NULL; | |
d9898ee8 | 75 | } |
d9898ee8 | 76 | |
8d138742 CE |
77 | if (pfix_len) |
78 | memcpy(q, pfix, pfix_len); | |
d9898ee8 | 79 | |
8d138742 CE |
80 | strcpy(q + pfix_len, p); |
81 | free(p); | |
82 | return q; | |
d9898ee8 | 83 | } |
84 | ||
8d138742 CE |
85 | char *rfc822_encode_domain(const char *address, |
86 | const char *charset) | |
d9898ee8 | 87 | { |
8d138742 CE |
88 | const struct unicode_info *ui=unicode_find(charset); |
89 | const char *cp; | |
90 | char *p, *q; | |
d9898ee8 | 91 | |
8d138742 | 92 | if (!ui) |
d9898ee8 | 93 | { |
8d138742 CE |
94 | errno=EINVAL; |
95 | return NULL; | |
d9898ee8 | 96 | } |
d9898ee8 | 97 | |
8d138742 | 98 | p=unicode_convert(address, ui, &unicode_UTF8); |
d9898ee8 | 99 | |
8d138742 CE |
100 | if (!p) |
101 | return NULL; | |
d9898ee8 | 102 | |
8d138742 | 103 | cp=strchr(p, '@'); |
d9898ee8 | 104 | |
8d138742 | 105 | if (!cp) |
d9898ee8 | 106 | { |
8d138742 CE |
107 | q=rfc822_encode_domain_int("", 0, p); |
108 | free(p); | |
109 | return q; | |
d9898ee8 | 110 | } |
111 | ||
8d138742 CE |
112 | ++cp; |
113 | q=rfc822_encode_domain_int(p, cp-p, cp); | |
114 | free(p); | |
115 | return q; | |
d9898ee8 | 116 | } |
117 | ||
8d138742 CE |
118 | static char *a_rfc2047_encode_str(const char *str, const char *charset, |
119 | int isaddress) | |
d9898ee8 | 120 | { |
8d138742 CE |
121 | size_t l; |
122 | char *p; | |
d9898ee8 | 123 | |
8d138742 CE |
124 | if (isaddress) |
125 | return rfc822_encode_domain(str, charset); | |
d9898ee8 | 126 | |
8d138742 CE |
127 | for (l=0; str[l]; l++) |
128 | if (str[l] & 0x80) | |
129 | break; | |
d9898ee8 | 130 | |
8d138742 | 131 | if (str[l] == 0) |
d9898ee8 | 132 | { |
8d138742 | 133 | size_t n; |
d9898ee8 | 134 | |
8d138742 CE |
135 | for (l=0; str[l]; l++) |
136 | if (strchr(RFC822_SPECIALS, str[l])) | |
137 | break; | |
d9898ee8 | 138 | |
8d138742 CE |
139 | if (str[l] == 0) |
140 | return (strdup(str)); | |
d9898ee8 | 141 | |
8d138742 CE |
142 | for (n=3, l=0; str[l]; l++) |
143 | { | |
144 | switch (str[l]) { | |
145 | case '"': | |
146 | case '\\': | |
147 | ++n; | |
d9898ee8 | 148 | break; |
8d138742 | 149 | } |
d9898ee8 | 150 | |
8d138742 CE |
151 | ++n; |
152 | } | |
d9898ee8 | 153 | |
8d138742 | 154 | p=malloc(n); |
d9898ee8 | 155 | |
8d138742 CE |
156 | if (!p) |
157 | return NULL; | |
d9898ee8 | 158 | |
8d138742 | 159 | p[0]='"'; |
d9898ee8 | 160 | |
8d138742 | 161 | for (n=1, l=0; str[l]; l++) |
d9898ee8 | 162 | { |
8d138742 CE |
163 | switch (str[l]) { |
164 | case '"': | |
165 | case '\\': | |
166 | p[n++]='\\'; | |
167 | break; | |
168 | } | |
d9898ee8 | 169 | |
8d138742 CE |
170 | p[n++]=str[l]; |
171 | } | |
172 | p[n++]='"'; | |
173 | p[n]=0; | |
d9898ee8 | 174 | |
8d138742 CE |
175 | return (p); |
176 | } | |
d9898ee8 | 177 | |
8d138742 CE |
178 | return rfc2047_encode_str(str, charset, rfc2047_qp_allow_word); |
179 | } | |
d9898ee8 | 180 | |
181 | static void count(char c, void *p); | |
182 | static void counts2(const char *c, void *p); | |
183 | static void save(char c, void *p); | |
184 | static void saves2(const char *c, void *p); | |
185 | ||
8d138742 CE |
186 | char *rfc2047_encode_header_addr(const struct rfc822a *a, |
187 | const char *charset) | |
d9898ee8 | 188 | { |
189 | size_t l; | |
190 | char *s, *p; | |
191 | ||
192 | l=1; | |
193 | rfc2047_encode_header_do(a, charset, &count, &counts2, &l); | |
194 | if ((s=malloc(l)) == 0) return (0); | |
195 | p=s; | |
196 | rfc2047_encode_header_do(a, charset, &save, &saves2, &p); | |
197 | *p=0; | |
198 | return (s); | |
199 | } | |
200 | ||
8d138742 CE |
201 | |
202 | char *rfc2047_encode_header_tobuf(const char *name, /* Header name */ | |
203 | const char *header, /* Header's contents */ | |
204 | const char *charset) | |
205 | { | |
206 | if (rfc822hdr_is_addr(name)) | |
207 | { | |
208 | char *s=0; | |
209 | ||
210 | struct rfc822t *t; | |
211 | struct rfc822a *a; | |
212 | ||
213 | if ((t=rfc822t_alloc_new(header, NULL, NULL)) != 0) | |
214 | { | |
215 | if ((a=rfc822a_alloc(t)) != 0) | |
216 | { | |
217 | s=rfc2047_encode_header_addr(a, charset); | |
218 | rfc822a_free(a); | |
219 | } | |
220 | rfc822t_free(t); | |
221 | } | |
222 | return s; | |
223 | } | |
224 | ||
225 | return rfc2047_encode_str(header, charset, rfc2047_qp_allow_word); | |
226 | } | |
227 | ||
d9898ee8 | 228 | static void count(char c, void *p) |
229 | { | |
230 | ++*(size_t *)p; | |
231 | } | |
232 | ||
233 | static void counts2(const char *c, void *p) | |
234 | { | |
8d138742 CE |
235 | if (*c == ',') |
236 | count(*c++, p); | |
237 | ||
238 | count('\n', p); | |
239 | count(' ', p); | |
d9898ee8 | 240 | |
241 | while (*c) count(*c++, p); | |
242 | } | |
243 | ||
244 | static void save(char c, void *p) | |
245 | { | |
246 | **(char **)p=c; | |
247 | ++*(char **)p; | |
248 | } | |
249 | ||
250 | static void saves2(const char *c, void *p) | |
251 | { | |
8d138742 CE |
252 | if (*c == ',') |
253 | save(*c++, p); | |
254 | ||
255 | save('\n', p); | |
256 | save(' ', p); | |
d9898ee8 | 257 | |
258 | while (*c) save(*c++, p); | |
259 | } | |
260 | ||
261 | static int encodebase64(const char *ptr, size_t len, const char *charset, | |
262 | int (*func)(const char *, size_t, void *), void *arg, | |
263 | size_t foldlen, size_t offset) | |
264 | { | |
265 | unsigned char ibuf[3]; | |
266 | char obuf[4]; | |
267 | int i, rc; | |
268 | ||
269 | while (len) | |
270 | { | |
271 | if ((rc=(*func)("=?", 2, arg)) || | |
272 | (rc=(*func)(charset, strlen(charset), arg))|| | |
273 | (rc=(*func)("?B?", 3, arg))) | |
274 | return rc; | |
275 | i = offset + 2 + strlen(charset) + 3; | |
276 | offset = 0; | |
277 | ||
278 | while (len) | |
279 | { | |
280 | size_t n=len > 3 ? 3:len; | |
281 | ||
282 | ibuf[0]= ptr[0]; | |
283 | if (n>1) | |
284 | ibuf[1]=ptr[1]; | |
285 | else | |
286 | ibuf[1]=0; | |
287 | if (n>2) | |
288 | ibuf[2]=ptr[2]; | |
289 | else | |
290 | ibuf[2]=0; | |
291 | ptr += n; | |
292 | len -= n; | |
293 | ||
294 | obuf[0] = base64tab[ ibuf[0] >>2 ]; | |
295 | obuf[1] = base64tab[(ibuf[0] & 0x03)<<4|ibuf[1]>>4]; | |
296 | obuf[2] = base64tab[(ibuf[1] & 0x0F)<<2|ibuf[2]>>6]; | |
297 | obuf[3] = base64tab[ ibuf[2] & 0x3F ]; | |
298 | if (n < 2) | |
299 | obuf[2] = '='; | |
300 | if (n < 3) | |
301 | obuf[3] = '='; | |
302 | ||
303 | if ((rc=(*func)(obuf, 4, arg))) | |
304 | return rc; | |
305 | ||
306 | i += 4; | |
307 | if (foldlen && i + 2 > foldlen - 1 + 4) | |
308 | break; | |
309 | } | |
310 | ||
311 | if ((rc=(*func)("?=", 2, arg))) | |
312 | return rc; | |
313 | if (len) | |
314 | /* | |
315 | * Encoded-words must be sepalated by | |
316 | * linear-white-space. | |
317 | */ | |
318 | if ((rc=(*func)(" ", 1, arg))) | |
319 | return rc; | |
320 | } | |
321 | return 0; | |
322 | } | |
323 | ||
324 | #define ISSPACE(i) ((i)=='\t' || (i)=='\r' || (i)=='\n' || (i)==' ') | |
325 | #define DOENCODE(i) (((i) & 0x80) || (i)=='"' || (i)=='=' || \ | |
326 | ((unsigned char)(i) < 0x20 && !ISSPACE(i)) || \ | |
327 | !(*qp_allow)(i)) | |
328 | ||
d9898ee8 | 329 | int rfc2047_encode_callback_base64(const char *str, const char *charset, |
330 | int (*qp_allow)(char), | |
331 | int (*func)(const char *, size_t, void *), | |
332 | void *arg) | |
333 | { | |
334 | int rc; | |
335 | int dummy=-1; | |
336 | size_t i; | |
337 | size_t offset=27; /* FIXME: initial offset for line length */ | |
338 | const struct unicode_info *uiptr = unicode_find(charset); | |
339 | unicode_char *ustr, *uptr; | |
340 | ||
341 | if (!str || !*str) | |
342 | return 0; | |
343 | ||
344 | for (i=0; str[i]; i++) | |
345 | if (DOENCODE(str[i])) | |
346 | break; | |
347 | if (str[i] == 0) | |
348 | return i? (*func)(str, strlen(str), arg): 0; | |
349 | ||
350 | /* | |
351 | * Multibyte or stateful charsets must be encoded with care of | |
352 | * character boundaries. Charsets with replaceable capability can be | |
353 | * encoded replacing errorneous characters. Otherwise, output without | |
354 | * care of character boundaries or errors. | |
355 | */ | |
356 | if (!uiptr || | |
357 | !(uiptr->flags & (UNICODE_MB | UNICODE_SISO)) || | |
358 | (!(uiptr->flags & UNICODE_REPLACEABLE) && | |
359 | !(ustr = (uiptr->c2u)(uiptr, str, &dummy))) || | |
360 | !(ustr = (uiptr->c2u)(uiptr, str, NULL))) | |
361 | return encodebase64(str, strlen(str), charset, func, arg, | |
362 | RFC2047_ENCODE_FOLDLENGTH, offset); | |
363 | ||
364 | uptr = ustr; | |
365 | while (*uptr) | |
366 | { | |
367 | unicode_char save_uc; | |
368 | char *wstr=NULL; | |
369 | size_t i, end, j; | |
370 | ||
371 | if ((i = offset + 2 + strlen(charset) + 3) > | |
372 | RFC2047_ENCODE_FOLDLENGTH - 2) | |
373 | /* Keep room for at least one character. */ | |
374 | i = RFC2047_ENCODE_FOLDLENGTH - 2; | |
375 | offset = 0; | |
376 | ||
377 | /* | |
378 | * Figure out where to break encoded-word. | |
379 | * Take a small chunk of Unicode string and convert it back to | |
380 | * the original charset. If the result exseeds line length, | |
381 | * try again with a shorter chunk. | |
382 | */ | |
383 | end = 0; | |
384 | while (uptr[end] && end < (RFC2047_ENCODE_FOLDLENGTH - i) / 2) | |
385 | end++; | |
386 | /* | |
387 | * FIXME: Unicode character with `combining' | |
388 | * property etc. should not be treated as | |
389 | * separate character. | |
390 | */ | |
391 | j = end; | |
392 | while (j) | |
393 | { | |
394 | save_uc = uptr[j]; | |
395 | uptr[j] = (unicode_char)0; | |
396 | wstr = (uiptr->u2c)(uiptr, uptr, &dummy); | |
397 | uptr[j] = save_uc; | |
398 | ||
399 | if (!wstr) | |
400 | /* Possiblly a part of one character extracted to | |
401 | * multiple Unicode characters (e.g. base unicode | |
402 | * character of one combined character). Try on | |
403 | * shorter chunk. | |
404 | */ | |
405 | { | |
406 | if (j == 0) | |
407 | break; | |
408 | ||
409 | j--; /* FIXME */ | |
410 | continue; | |
411 | } | |
412 | ||
413 | if (i + ((strlen(wstr) + 3-1) / 3) * 4 + 2 > | |
414 | RFC2047_ENCODE_FOLDLENGTH - 1) | |
415 | /* | |
416 | * Encoded string exceeded line length. | |
417 | * Try on shorter chunk. | |
418 | */ | |
419 | { | |
420 | size_t k=j; | |
421 | ||
422 | j--; /* FIXME */ | |
423 | if (j == 0) | |
424 | /* Only one character exeeds line length. | |
425 | * Anyway, encode it. */ | |
426 | { | |
427 | j = k; | |
428 | break; | |
429 | } | |
430 | free(wstr); | |
431 | continue; | |
432 | } | |
433 | ||
434 | break; | |
435 | } | |
436 | ||
437 | if (!wstr) | |
438 | { | |
439 | end = 1; | |
440 | rc = encodebase64("?", 1, charset, func, arg, 0, 0); | |
441 | } | |
442 | else | |
443 | { | |
444 | end = j; | |
445 | rc = encodebase64(wstr, strlen(wstr), | |
446 | charset, func, arg, 0, 0); | |
447 | free(wstr); | |
448 | } | |
449 | if (rc) | |
450 | { | |
451 | free(ustr); | |
452 | return rc; | |
453 | } | |
454 | uptr += end; | |
455 | ||
456 | if (*uptr) | |
457 | /* | |
458 | * Encoded-words must be sepalated by | |
459 | * linear-white-space. | |
460 | */ | |
461 | if ((rc=(*func)(" ", 1, arg))) | |
462 | { | |
463 | free(ustr); | |
464 | return rc; | |
465 | } | |
466 | } | |
467 | free(ustr); | |
468 | return 0; | |
469 | } | |
d9898ee8 | 470 | |
471 | #define DOENCODEWORD(c) \ | |
472 | (((c) & 0x80) || (c) == '"' || (unsigned char)(c) <= 0x20 || \ | |
473 | (c) == '_' || (c) == '=' || (c) == '?' || !(*qp_allow)(c)) | |
474 | ||
475 | int rfc2047_encode_callback(const char *str, const char *charset, | |
476 | int (*qp_allow)(char), | |
477 | int (*func)(const char *, size_t, void *), | |
478 | void *arg) | |
479 | { | |
480 | int rc; | |
481 | int maxlen; | |
d9898ee8 | 482 | const struct unicode_info *ci = unicode_find(charset); |
d9898ee8 | 483 | |
484 | if (!str || !*str) | |
485 | return 0; | |
486 | ||
d9898ee8 | 487 | if (ci && ci->flags & UNICODE_SISO) |
488 | return rfc2047_encode_callback_base64(str, charset, qp_allow, | |
489 | func, arg); | |
d9898ee8 | 490 | |
491 | /* otherwise, output quoted-printable-encoded. */ | |
492 | ||
493 | while (*str) | |
494 | { | |
495 | size_t i, j, n, c; | |
496 | ||
497 | for (i=0; str[i]; i++) | |
498 | if (!ISSPACE((int)(unsigned char)str[i]) | |
499 | && DOENCODE(str[i])) | |
500 | break; | |
501 | if (str[i] == 0) | |
502 | return ( i ? (*func)(str, i, arg):0); | |
503 | ||
504 | /* Find start of word */ | |
505 | ||
506 | while (i) | |
507 | { | |
508 | --i; | |
509 | if (ISSPACE((int)(unsigned char)str[i])) | |
510 | { | |
511 | ++i; | |
512 | break; | |
513 | } | |
514 | } | |
515 | if (i) | |
516 | { | |
517 | rc= (*func)(str, i, arg); | |
518 | if (rc) return (rc); | |
519 | str += i; | |
520 | } | |
521 | ||
522 | /* | |
523 | ** Figure out when to stop MIME decoding. Consecutive | |
524 | ** MIME-encoded words are MIME-encoded together. | |
525 | */ | |
526 | ||
527 | i=0; | |
528 | ||
529 | for (;;) | |
530 | { | |
531 | for ( ; str[i]; i++) | |
532 | if (ISSPACE((int)(unsigned char)str[i])) | |
533 | break; | |
534 | if (str[i] == 0) | |
535 | break; | |
536 | ||
537 | for (c=i; str[c] && ISSPACE((int)(unsigned char)str[c]); | |
538 | ++c) | |
539 | ; | |
540 | ||
541 | for (; str[c]; c++) | |
542 | if (ISSPACE((int)(unsigned char)str[c]) || | |
543 | DOENCODE(str[c])) | |
544 | break; | |
545 | ||
546 | if (str[c] == 0 || ISSPACE((int)(unsigned char)str[c])) | |
547 | break; | |
548 | i=c; | |
549 | } | |
550 | ||
551 | /* | |
552 | ** Figure out whether base64 is a better choice. | |
553 | */ | |
554 | ||
555 | n=0; | |
556 | ||
557 | for (j=0; j<i; j++) | |
558 | if (DOENCODEWORD(str[j])) | |
559 | ++n; | |
560 | ||
561 | if (n > i/10) | |
562 | { | |
563 | encodebase64(str, i, charset, func, arg, | |
564 | 70, 0); | |
565 | str += i; | |
566 | continue; | |
567 | } | |
568 | ||
569 | ||
570 | ||
571 | /* Output mimeified text, insert spaces at 70+ character | |
572 | ** boundaries for line wrapping. | |
573 | */ | |
574 | ||
575 | maxlen=strlen(charset)+10; | |
576 | ||
577 | if (maxlen < 65) | |
578 | maxlen=74-maxlen; | |
579 | else | |
580 | maxlen=10; | |
581 | ||
582 | c=0; | |
583 | while (i) | |
584 | { | |
585 | if (c == 0) | |
586 | { | |
587 | if ( (rc=(*func)("=?", 2, arg)) != 0 || | |
588 | (rc=(*func)(charset, strlen(charset), | |
589 | arg)) != 0 || | |
590 | (rc=(*func)("?Q?", 3, arg)) != 0) | |
591 | return (rc); | |
592 | c += strlen(charset)+5; | |
593 | } | |
594 | ||
595 | if (DOENCODEWORD(*str)) | |
596 | { | |
597 | char buf[3]; | |
598 | ||
599 | buf[0]='='; | |
600 | buf[1]=xdigit[ ( *str >> 4) & 0x0F ]; | |
601 | buf[2]=xdigit[ *str & 0x0F ]; | |
602 | ||
603 | if ( (rc=*str == ' ' ? (*func)("_", 1, arg) | |
604 | : (*func)(buf, 3, arg)) != 0) | |
605 | return (rc); | |
606 | c += *str == ' ' ? 1:3; | |
607 | ++str; | |
608 | --i; | |
609 | } | |
610 | else | |
611 | { | |
612 | for (j=0; j < i && !DOENCODEWORD(str[j]); j++) | |
613 | if (j + c >= maxlen) | |
614 | break; | |
615 | if ( (rc=(*func)(str, j, arg)) != 0) | |
616 | return (rc); | |
617 | c += j; | |
618 | str += j; | |
619 | i -= j; | |
620 | } | |
621 | ||
622 | if (i == 0 || c >= maxlen) | |
623 | { | |
624 | if ( (rc=(*func)("?= ", i ? 3:2, arg)) != 0) | |
625 | return (rc); | |
626 | ||
627 | c=0; | |
628 | } | |
629 | } | |
630 | } | |
631 | return (0); | |
632 | } | |
633 | ||
634 | static int count_char(const char *c, size_t l, void *p) | |
635 | { | |
636 | size_t *i=(size_t *)p; | |
637 | ||
638 | *i += l; | |
639 | return (0); | |
640 | } | |
641 | ||
642 | static int save_char(const char *c, size_t l, void *p) | |
643 | { | |
644 | char **s=(char **)p; | |
645 | ||
646 | memcpy(*s, c, l); | |
647 | *s += l; | |
648 | return (0); | |
649 | } | |
650 | ||
651 | char *rfc2047_encode_str(const char *str, const char *charset, | |
652 | int (*qp_allow)(char c)) | |
653 | { | |
654 | size_t i=1; | |
655 | char *s, *p; | |
656 | ||
657 | (void)rfc2047_encode_callback(str, charset, | |
658 | qp_allow, | |
659 | &count_char, &i); | |
660 | if ((s=malloc(i)) == 0) return (0); | |
661 | p=s; | |
662 | (void)rfc2047_encode_callback(str, charset, | |
663 | qp_allow, | |
664 | &save_char, &p); | |
665 | *p=0; | |
666 | return (s); | |
667 | } | |
668 | ||
669 | int rfc2047_qp_allow_any(char c) | |
670 | { | |
671 | return 1; | |
672 | } | |
673 | ||
674 | int rfc2047_qp_allow_comment(char c) | |
675 | { | |
676 | if (c == '(' || c == ')' || c == '"') | |
677 | return 0; | |
678 | return 1; | |
679 | } | |
680 | ||
681 | int rfc2047_qp_allow_word(char c) | |
682 | { | |
683 | return strchr(base64tab, c) != NULL || | |
684 | strchr("*-=_", c) != NULL; | |
685 | } |