24dd3a12894002b17286fc6fd4e3850835776595
[claws.git] / src / procmime.c
1 /*
2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
3  * Copyright (C) 1999-2003 Hiroyuki Yamamoto
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18  */
19
20 #ifdef HAVE_CONFIG_H
21 #  include "config.h"
22 #endif
23
24 #include "defs.h"
25
26 #include <glib.h>
27 #include <stdio.h>
28 #include <string.h>
29 #include <locale.h>
30 #include <ctype.h>
31
32 #include "intl.h"
33 #include "procmime.h"
34 #include "procheader.h"
35 #include "base64.h"
36 #include "quoted-printable.h"
37 #include "uuencode.h"
38 #include "unmime.h"
39 #include "html.h"
40 #include "enriched.h"
41 #include "codeconv.h"
42 #include "utils.h"
43 #include "prefs_common.h"
44
45 #if USE_GPGME
46 #  include "rfc2015.h"
47 #endif
48
49 #include "prefs_gtk.h"
50
51 static GHashTable *procmime_get_mime_type_table (void);
52
53 MimeInfo *procmime_mimeinfo_new(void)
54 {
55         MimeInfo *mimeinfo;
56
57         mimeinfo = g_new0(MimeInfo, 1);
58         mimeinfo->mime_type     = MIME_UNKNOWN;
59         mimeinfo->encoding_type = ENC_UNKNOWN;
60
61         return mimeinfo;
62 }
63
64 void procmime_mimeinfo_free_all(MimeInfo *mimeinfo)
65 {
66         while (mimeinfo != NULL) {
67                 MimeInfo *next;
68
69                 g_free(mimeinfo->encoding);
70                 g_free(mimeinfo->content_type);
71                 g_free(mimeinfo->charset);
72                 g_free(mimeinfo->name);
73                 g_free(mimeinfo->boundary);
74                 g_free(mimeinfo->content_disposition);
75                 g_free(mimeinfo->filename);
76 #if USE_GPGME
77                 g_free(mimeinfo->plaintextfile);
78                 g_free(mimeinfo->sigstatus);
79                 g_free(mimeinfo->sigstatus_full);
80 #endif
81
82                 procmime_mimeinfo_free_all(mimeinfo->sub);
83                 procmime_mimeinfo_free_all(mimeinfo->children);
84 #if USE_GPGME
85                 procmime_mimeinfo_free_all(mimeinfo->plaintext);
86 #endif
87
88                 next = mimeinfo->next;
89                 g_free(mimeinfo);
90                 mimeinfo = next;
91         }
92 }
93
94 MimeInfo *procmime_mimeinfo_insert(MimeInfo *parent, MimeInfo *mimeinfo)
95 {
96         MimeInfo *child = parent->children;
97
98         if (!child)
99                 parent->children = mimeinfo;
100         else {
101                 while (child->next != NULL)
102                         child = child->next;
103
104                 child->next = mimeinfo;
105         }
106
107         mimeinfo->parent = parent;
108         mimeinfo->level = parent->level + 1;
109
110         return mimeinfo;
111 }
112
113 void procmime_mimeinfo_replace(MimeInfo *old, MimeInfo *new)
114 {
115         MimeInfo *parent = old->parent;
116         MimeInfo *child;
117
118         g_return_if_fail(parent != NULL);
119         g_return_if_fail(new->next == NULL);
120
121         for (child = parent->children; child && child != old;
122              child = child->next)
123                 ;
124         if (!child) {
125                 g_warning("oops: parent can't find it's own child");
126                 return;
127         }
128         procmime_mimeinfo_free_all(old);
129
130         if (child == parent->children) {
131                 new->next = parent->children->next;
132                 parent->children = new;
133         } else {
134                 new->next = child->next;
135                 child = new;
136         }
137 }
138
139 MimeInfo *procmime_mimeinfo_next(MimeInfo *mimeinfo)
140 {
141         if (!mimeinfo) return NULL;
142
143         if (mimeinfo->children)
144                 return mimeinfo->children;
145         if (mimeinfo->sub)
146                 return mimeinfo->sub;
147         if (mimeinfo->next)
148                 return mimeinfo->next;
149
150         if (mimeinfo->main) {
151                 mimeinfo = mimeinfo->main;
152                 if (mimeinfo->next)
153                         return mimeinfo->next;
154         }
155
156         for (mimeinfo = mimeinfo->parent; mimeinfo != NULL;
157              mimeinfo = mimeinfo->parent) {
158                 if (mimeinfo->next)
159                         return mimeinfo->next;
160                 if (mimeinfo->main) {
161                         mimeinfo = mimeinfo->main;
162                         if (mimeinfo->next)
163                                 return mimeinfo->next;
164                 }
165         }
166
167         return NULL;
168 }
169
170 MimeInfo *procmime_scan_message(MsgInfo *msginfo)
171 {
172         FILE *fp;
173         MimeInfo *mimeinfo;
174
175         g_return_val_if_fail(msginfo != NULL, NULL);
176
177         if ((fp = procmsg_open_message(msginfo)) == NULL) return NULL;
178         mimeinfo = procmime_scan_mime_header(fp);
179
180         if (mimeinfo) {
181                 if (mimeinfo->mime_type != MIME_MULTIPART) {
182                         if (fseek(fp, mimeinfo->fpos, SEEK_SET) < 0)
183                                 perror("fseek");
184                 }
185                 if (mimeinfo->mime_type != MIME_TEXT)
186                         procmime_scan_multipart_message(mimeinfo, fp);
187         }
188
189 #if USE_GPGME
190         if (prefs_common.auto_check_signatures)
191                 rfc2015_check_signature(mimeinfo, fp);
192 #endif
193         fclose(fp);
194
195         return mimeinfo;
196 }
197
198 void procmime_scan_multipart_message(MimeInfo *mimeinfo, FILE *fp)
199 {
200         gchar *p;
201         gchar *boundary;
202         gint boundary_len = 0;
203         gchar buf[BUFFSIZE];
204         glong fpos, prev_fpos;
205         gint npart;
206
207         g_return_if_fail(mimeinfo != NULL);
208         g_return_if_fail(mimeinfo->mime_type != MIME_TEXT);
209
210         if (mimeinfo->mime_type == MIME_MULTIPART) {
211                 g_return_if_fail(mimeinfo->boundary != NULL);
212                 g_return_if_fail(mimeinfo->sub == NULL);
213         }
214         g_return_if_fail(fp != NULL);
215
216         boundary = mimeinfo->boundary;
217
218         if (boundary) {
219                 boundary_len = strlen(boundary);
220
221                 /* look for first boundary */
222                 while ((p = fgets(buf, sizeof(buf), fp)) != NULL)
223                         if (IS_BOUNDARY(buf, boundary, boundary_len)) break;
224                 if (!p) return;
225         }
226
227         if ((fpos = ftell(fp)) < 0) {
228                 perror("ftell");
229                 return;
230         }
231
232         for (npart = 0;; npart++) {
233                 MimeInfo *partinfo;
234                 gboolean eom = FALSE;
235
236                 prev_fpos = fpos;
237                 debug_print("prev_fpos: %ld\n", fpos);
238
239                 partinfo = procmime_scan_mime_header(fp);
240                 if (!partinfo) break;
241                 procmime_mimeinfo_insert(mimeinfo, partinfo);
242
243                 if (partinfo->mime_type == MIME_MULTIPART) {
244                         if (partinfo->level < 8)
245                                 procmime_scan_multipart_message(partinfo, fp);
246                 } else if (partinfo->mime_type == MIME_MESSAGE_RFC822) {
247                         MimeInfo *sub;
248
249                         partinfo->sub = sub = procmime_scan_mime_header(fp);
250                         if (!sub) break;
251
252                         sub->level = partinfo->level + 1;
253                         sub->parent = partinfo;
254                         sub->main = partinfo;
255
256                         if (sub->level < 8) {
257                                 if (sub->mime_type == MIME_MULTIPART) {
258                                         procmime_scan_multipart_message
259                                                 (sub, fp);
260                                 } else if (sub->mime_type == MIME_MESSAGE_RFC822) {
261                                         fseek(fp, sub->fpos, SEEK_SET);
262                                         procmime_scan_multipart_message
263                                                 (sub, fp);
264                                 }
265                         }
266                 }
267
268                 /* look for next boundary */
269                 buf[0] = '\0';
270                 while ((p = fgets(buf, sizeof(buf), fp)) != NULL) {
271                         if (IS_BOUNDARY(buf, boundary, boundary_len)) {
272                                 if (buf[2 + boundary_len]     == '-' &&
273                                     buf[2 + boundary_len + 1] == '-')
274                                         eom = TRUE;
275                                 break;
276                         }
277                 }
278                 if (p == NULL) {
279                         /* broken MIME, or single part MIME message */
280                         buf[0] = '\0';
281                         eom = TRUE;
282                 }
283                 fpos = ftell(fp);
284                 debug_print("fpos: %ld\n", fpos);
285
286                 partinfo->size = fpos - prev_fpos - strlen(buf);
287                 debug_print("partinfo->size: %d\n", partinfo->size);
288                 if (partinfo->sub && !partinfo->sub->sub &&
289                     !partinfo->sub->children) {
290                         partinfo->sub->size = fpos - partinfo->sub->fpos - strlen(buf);
291                         debug_print("partinfo->sub->size: %d\n",
292                                     partinfo->sub->size);
293                 }
294                 debug_print("boundary: %s\n", buf);
295
296                 if (eom) break;
297         }
298 }
299
300 void procmime_scan_encoding(MimeInfo *mimeinfo, const gchar *encoding)
301 {
302         gchar *buf;
303
304         Xstrdup_a(buf, encoding, return);
305
306         g_free(mimeinfo->encoding);
307
308         mimeinfo->encoding = g_strdup(g_strstrip(buf));
309         if (!strcasecmp(buf, "7bit"))
310                 mimeinfo->encoding_type = ENC_7BIT;
311         else if (!strcasecmp(buf, "8bit"))
312                 mimeinfo->encoding_type = ENC_8BIT;
313         else if (!strcasecmp(buf, "quoted-printable"))
314                 mimeinfo->encoding_type = ENC_QUOTED_PRINTABLE;
315         else if (!strcasecmp(buf, "base64"))
316                 mimeinfo->encoding_type = ENC_BASE64;
317         else if (!strcasecmp(buf, "x-uuencode"))
318                 mimeinfo->encoding_type = ENC_X_UUENCODE;
319         else
320                 mimeinfo->encoding_type = ENC_UNKNOWN;
321
322 }
323
324 void procmime_scan_content_type(MimeInfo *mimeinfo, const gchar *content_type)
325 {
326         gchar *delim, *p, *cnttype;
327         gchar *buf;
328
329         if (conv_get_current_charset() == C_EUC_JP &&
330             strchr(content_type, '\033')) {
331                 gint len;
332                 len = strlen(content_type) * 2 + 1;
333                 Xalloca(buf, len, return);
334                 conv_jistoeuc(buf, len, content_type);
335         } else
336                 Xstrdup_a(buf, content_type, return);
337
338         g_free(mimeinfo->content_type);
339         g_free(mimeinfo->charset);
340         /* g_free(mimeinfo->name); */
341         mimeinfo->content_type = NULL;
342         mimeinfo->charset      = NULL;
343         /* mimeinfo->name      = NULL; */
344
345         if ((delim = strchr(buf, ';'))) *delim = '\0';
346         mimeinfo->content_type = cnttype = g_strdup(g_strstrip(buf));
347
348         mimeinfo->mime_type = procmime_scan_mime_type(cnttype);
349
350         if (!delim) return;
351         p = delim + 1;
352
353         for (;;) {
354                 gchar *eq;
355                 gchar *attr, *value;
356
357                 if ((delim = strchr(p, ';'))) *delim = '\0';
358
359                 if (!(eq = strchr(p, '='))) break;
360
361                 *eq = '\0';
362                 attr = p;
363                 g_strstrip(attr);
364                 value = eq + 1;
365                 g_strstrip(value);
366
367                 if (*value == '"')
368                         extract_quote(value, '"');
369                 else {
370                         eliminate_parenthesis(value, '(', ')');
371                         g_strstrip(value);
372                 }
373
374                 if (*value) {
375                         if (!strcasecmp(attr, "charset"))
376                                 mimeinfo->charset = g_strdup(value);
377                         else if (!strcasecmp(attr, "name")) {
378                                 gchar *tmp;
379                                 size_t len;
380
381                                 len = strlen(value) + 1;
382                                 Xalloca(tmp, len, return);
383                                 conv_unmime_header(tmp, len, value, NULL);
384                                 g_free(mimeinfo->name);
385                                 /*pgp signatures should NOT have a name */
386                                 if (mimeinfo->content_type 
387                                 &&  strcasecmp(mimeinfo->content_type, "application/pgp-signature"))
388                                         mimeinfo->name = g_strdup(tmp);
389                         } else if (!strcasecmp(attr, "boundary"))
390                                 mimeinfo->boundary = g_strdup(value);
391                 }
392
393                 if (!delim) break;
394                 p = delim + 1;
395         }
396
397         if (mimeinfo->mime_type == MIME_MULTIPART && !mimeinfo->boundary)
398                 mimeinfo->mime_type = MIME_TEXT;
399 }
400
401 void procmime_scan_content_disposition(MimeInfo *mimeinfo,
402                                        const gchar *content_disposition)
403 {
404         gchar *delim, *p, *dispos;
405         gchar *buf;
406
407         if (conv_get_current_charset() == C_EUC_JP &&
408             strchr(content_disposition, '\033')) {
409                 gint len;
410                 len = strlen(content_disposition) * 2 + 1;
411                 Xalloca(buf, len, return);
412                 conv_jistoeuc(buf, len, content_disposition);
413         } else
414                 Xstrdup_a(buf, content_disposition, return);
415
416         if ((delim = strchr(buf, ';'))) *delim = '\0';
417         mimeinfo->content_disposition = dispos = g_strdup(g_strstrip(buf));
418
419         if (!delim) return;
420         p = delim + 1;
421
422         for (;;) {
423                 gchar *eq;
424                 gchar *attr, *value;
425
426                 if ((delim = strchr(p, ';'))) *delim = '\0';
427
428                 if (!(eq = strchr(p, '='))) break;
429
430                 *eq = '\0';
431                 attr = p;
432                 g_strstrip(attr);
433                 value = eq + 1;
434                 g_strstrip(value);
435
436                 if (*value == '"')
437                         extract_quote(value, '"');
438                 else {
439                         eliminate_parenthesis(value, '(', ')');
440                         g_strstrip(value);
441                 }
442
443                 if (*value) {
444                         if (!strcasecmp(attr, "filename")) {
445                                 gchar *tmp;
446                                 size_t len;
447
448                                 len = strlen(value) + 1;
449                                 Xalloca(tmp, len, return);
450                                 conv_unmime_header(tmp, len, value, NULL);
451                                 g_free(mimeinfo->filename);
452                                 /*pgp signatures should NOT have a name */
453                                 if (mimeinfo->content_type 
454                                 &&  strcasecmp(mimeinfo->content_type, "application/pgp-signature"))
455                                         mimeinfo->filename = g_strdup(tmp);
456                                 break;
457                         }
458                 }
459
460                 if (!delim) break;
461                 p = delim + 1;
462         }
463 }
464
465 void procmime_scan_content_description(MimeInfo *mimeinfo,
466                                        const gchar *content_description)
467 {
468         gchar *buf;
469
470         gchar *tmp;
471         size_t blen;
472
473         if (conv_get_current_charset() == C_EUC_JP &&
474             strchr(content_description, '\033')) {
475                 gint len;
476                 len = strlen(content_description) * 2 + 1;
477                 Xalloca(buf, len, return);
478                 conv_jistoeuc(buf, len, content_description);
479         } else
480                 Xstrdup_a(buf, content_description, return);
481         
482         blen = strlen(buf) + 1;
483         Xalloca(tmp, blen, return);
484         conv_unmime_header(tmp, blen, buf, NULL);
485         /*pgp signatures should NOT have a name */
486         if (mimeinfo->content_type 
487         &&  strcasecmp(mimeinfo->content_type, "application/pgp-signature"))
488                 mimeinfo->description = g_strdup(tmp);
489 }
490
491 void procmime_scan_subject(MimeInfo *mimeinfo,
492                            const gchar *subject)
493 {
494         gchar *buf;
495
496         gchar *tmp;
497         size_t blen;
498
499         if (conv_get_current_charset() == C_EUC_JP &&
500             strchr(subject, '\033')) {
501                 gint len;
502                 len = strlen(subject) * 2 + 1;
503                 Xalloca(buf, len, return);
504                 conv_jistoeuc(buf, len, subject);
505         } else
506                 Xstrdup_a(buf, subject, return);
507         
508         blen = strlen(buf) + 1;
509         Xalloca(tmp, blen, return);
510         conv_unmime_header(tmp, blen, buf, NULL);
511         g_free(mimeinfo->name);
512         mimeinfo->name = g_strdup(tmp);
513 }
514
515 enum
516 {
517         H_CONTENT_TRANSFER_ENCODING = 0,
518         H_CONTENT_TYPE              = 1,
519         H_CONTENT_DISPOSITION       = 2,
520         H_CONTENT_DESCRIPTION       = 3,
521         H_SUBJECT                   = 4
522 };
523
524 MimeInfo *procmime_scan_mime_header(FILE *fp)
525 {
526         static HeaderEntry hentry[] = {{"Content-Transfer-Encoding:",
527                                                           NULL, FALSE},
528                                        {"Content-Type:", NULL, TRUE},
529                                        {"Content-Disposition:",
530                                                           NULL, TRUE},
531                                        {"Content-description:",
532                                                           NULL, TRUE},
533                                        {"Subject:",
534                                                           NULL, TRUE},
535                                        {NULL,             NULL, FALSE}};
536         gchar buf[BUFFSIZE];
537         gint hnum;
538         HeaderEntry *hp;
539         MimeInfo *mimeinfo;
540
541         g_return_val_if_fail(fp != NULL, NULL);
542
543         mimeinfo = procmime_mimeinfo_new();
544         mimeinfo->mime_type = MIME_TEXT;
545         mimeinfo->encoding_type = ENC_7BIT;
546         mimeinfo->fpos = ftell(fp);
547
548         while ((hnum = procheader_get_one_field(buf, sizeof(buf), fp, hentry))
549                != -1) {
550                 hp = hentry + hnum;
551
552                 if (H_CONTENT_TRANSFER_ENCODING == hnum) {
553                         procmime_scan_encoding
554                                 (mimeinfo, buf + strlen(hp->name));
555                 } else if (H_CONTENT_TYPE == hnum) {
556                         procmime_scan_content_type
557                                 (mimeinfo, buf + strlen(hp->name));
558                 } else if (H_CONTENT_DISPOSITION == hnum) {
559                         procmime_scan_content_disposition
560                                 (mimeinfo, buf + strlen(hp->name));
561                 } else if (H_CONTENT_DESCRIPTION == hnum) {
562                         procmime_scan_content_description
563                                 (mimeinfo, buf + strlen(hp->name));
564                 } else if (H_SUBJECT == hnum) {
565                         procmime_scan_subject
566                                 (mimeinfo, buf + strlen(hp->name));
567                 }
568         }
569
570         if (!mimeinfo->content_type)
571                         mimeinfo->content_type = g_strdup("text/plain");
572
573         return mimeinfo;
574 }
575
576 FILE *procmime_decode_content(FILE *outfp, FILE *infp, MimeInfo *mimeinfo)
577 {
578         gchar buf[BUFFSIZE];
579         gchar *boundary = NULL;
580         gint boundary_len = 0;
581         gboolean tmp_file = FALSE;
582
583         g_return_val_if_fail(infp != NULL, NULL);
584         g_return_val_if_fail(mimeinfo != NULL, NULL);
585
586         if (!outfp) {
587                 outfp = my_tmpfile();
588                 if (!outfp) {
589                         perror("tmpfile");
590                         return NULL;
591                 }
592                 tmp_file = TRUE;
593         }
594
595         if (mimeinfo->parent && mimeinfo->parent->boundary) {
596                 boundary = mimeinfo->parent->boundary;
597                 boundary_len = strlen(boundary);
598         }
599
600         if (mimeinfo->encoding_type == ENC_QUOTED_PRINTABLE) {
601                 while (fgets(buf, sizeof(buf), infp) != NULL &&
602                        (!boundary ||
603                         !IS_BOUNDARY(buf, boundary, boundary_len))) {
604                         gint len;
605                         len = qp_decode_line(buf);
606                         fwrite(buf, len, 1, outfp);
607                 }
608         } else if (mimeinfo->encoding_type == ENC_BASE64) {
609                 gchar outbuf[BUFFSIZE];
610                 gint len;
611                 Base64Decoder *decoder;
612
613                 decoder = base64_decoder_new();
614                 while (fgets(buf, sizeof(buf), infp) != NULL &&
615                        (!boundary ||
616                         !IS_BOUNDARY(buf, boundary, boundary_len))) {
617                         len = base64_decoder_decode(decoder, buf, outbuf);
618                         if (len < 0) {
619                                 g_warning("Bad BASE64 content\n");
620                                 break;
621                         }
622                         fwrite(outbuf, sizeof(gchar), len, outfp);
623                 }
624                 base64_decoder_free(decoder);
625         } else if (mimeinfo->encoding_type == ENC_X_UUENCODE) {
626                 gchar outbuf[BUFFSIZE];
627                 gint len;
628                 gboolean flag = FALSE;
629
630                 while (fgets(buf, sizeof(buf), infp) != NULL &&
631                        (!boundary ||
632                         !IS_BOUNDARY(buf, boundary, boundary_len))) {
633                         if(!flag && strncmp(buf,"begin ", 6)) continue;
634
635                         if (flag) {
636                                 len = fromuutobits(outbuf, buf);
637                                 if (len <= 0) {
638                                         if (len < 0) 
639                                                 g_warning("Bad UUENCODE content(%d)\n", len);
640                                         break;
641                                 }
642                                 fwrite(outbuf, sizeof(gchar), len, outfp);
643                         } else
644                                 flag = TRUE;
645                 }
646         } else {
647                 while (fgets(buf, sizeof(buf), infp) != NULL &&
648                        (!boundary ||
649                         !IS_BOUNDARY(buf, boundary, boundary_len))) {
650                         fputs(buf, outfp);
651                 }
652         }
653
654         if (tmp_file) rewind(outfp);
655         return outfp;
656 }
657
658 gint procmime_get_part(const gchar *outfile, const gchar *infile,
659                        MimeInfo *mimeinfo)
660 {
661         FILE *infp, *outfp;
662         gchar buf[BUFFSIZE];
663
664         g_return_val_if_fail(outfile != NULL, -1);
665         g_return_val_if_fail(infile != NULL, -1);
666         g_return_val_if_fail(mimeinfo != NULL, -1);
667
668         if ((infp = fopen(infile, "rb")) == NULL) {
669                 FILE_OP_ERROR(infile, "fopen");
670                 return -1;
671         }
672         if (fseek(infp, mimeinfo->fpos, SEEK_SET) < 0) {
673                 FILE_OP_ERROR(infile, "fseek");
674                 fclose(infp);
675                 return -1;
676         }
677         if ((outfp = fopen(outfile, "wb")) == NULL) {
678                 FILE_OP_ERROR(outfile, "fopen");
679                 fclose(infp);
680                 return -1;
681         }
682
683         while (fgets(buf, sizeof(buf), infp) != NULL)
684                 if (buf[0] == '\r' || buf[0] == '\n') break;
685
686         procmime_decode_content(outfp, infp, mimeinfo);
687
688         fclose(infp);
689         if (fclose(outfp) == EOF) {
690                 FILE_OP_ERROR(outfile, "fclose");
691                 unlink(outfile);
692                 return -1;
693         }
694
695         return 0;
696 }
697
698 struct ContentRenderer {
699         char * content_type;
700         char * renderer;
701 };
702
703 static GList * renderer_list = NULL;
704
705 static struct ContentRenderer *
706 content_renderer_new(char * content_type, char * renderer)
707 {
708         struct ContentRenderer * cr;
709
710         cr = g_new(struct ContentRenderer, 1);
711         if (cr == NULL)
712                 return NULL;
713
714         cr->content_type = g_strdup(content_type);
715         cr->renderer = g_strdup(renderer);
716
717         return cr;
718 }
719
720 static void content_renderer_free(struct ContentRenderer * cr)
721 {
722         g_free(cr->content_type);
723         g_free(cr->renderer);
724         g_free(cr);
725 }
726
727 void renderer_read_config(void)
728 {
729         gchar buf[BUFFSIZE];
730         FILE * f;
731         gchar * rcpath;
732
733         g_list_foreach(renderer_list, (GFunc) content_renderer_free, NULL);
734         renderer_list = NULL;
735
736         rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S, RENDERER_RC, NULL);
737         f = fopen(rcpath, "rb");
738         g_free(rcpath);
739         
740         if (f == NULL)
741                 return;
742
743         while (fgets(buf, BUFFSIZE, f)) {
744                 char * p;
745                 struct ContentRenderer * cr;
746
747                 strretchomp(buf);
748                 p = strchr(buf, ' ');
749                 if (p == NULL)
750                         continue;
751                 * p = 0;
752
753                 cr = content_renderer_new(buf, p + 1);
754                 if (cr == NULL)
755                         continue;
756
757                 renderer_list = g_list_append(renderer_list, cr);
758         }
759
760         fclose(f);
761 }
762
763 void renderer_write_config(void)
764 {
765         gchar * rcpath;
766         PrefFile *pfile;
767         GList * cur;
768
769         rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S, RENDERER_RC, NULL);
770         
771         if ((pfile = prefs_write_open(rcpath)) == NULL) {
772                 g_warning("failed to write configuration to file\n");
773                 g_free(rcpath);
774                 return;
775         }
776
777         g_free(rcpath);
778
779         for(cur = renderer_list ; cur != NULL ; cur = cur->next) {
780                 struct ContentRenderer * renderer;
781                 renderer = cur->data;
782                 fprintf(pfile->fp, "%s %s\n", renderer->content_type,
783                         renderer->renderer);
784         }
785
786         if (prefs_file_close(pfile) < 0) {
787                 g_warning("failed to write configuration to file\n");
788                 return;
789         }
790 }
791
792 FILE *procmime_get_text_content(MimeInfo *mimeinfo, FILE *infp)
793 {
794         FILE *tmpfp, *outfp;
795         gchar *src_codeset;
796         gboolean conv_fail = FALSE;
797         gchar buf[BUFFSIZE];
798         gchar *str;
799         struct ContentRenderer * renderer;
800         GList * cur;
801
802         g_return_val_if_fail(mimeinfo != NULL, NULL);
803         g_return_val_if_fail(infp != NULL, NULL);
804         g_return_val_if_fail(mimeinfo->mime_type == MIME_TEXT ||
805                              mimeinfo->mime_type == MIME_TEXT_HTML ||
806                              mimeinfo->mime_type == MIME_TEXT_ENRICHED, NULL);
807
808         if (fseek(infp, mimeinfo->fpos, SEEK_SET) < 0) {
809                 perror("fseek");
810                 return NULL;
811         }
812
813         while (fgets(buf, sizeof(buf), infp) != NULL)
814                 if (buf[0] == '\r' || buf[0] == '\n') break;
815
816         tmpfp = procmime_decode_content(NULL, infp, mimeinfo);
817         if (!tmpfp)
818                 return NULL;
819
820         if ((outfp = my_tmpfile()) == NULL) {
821                 perror("tmpfile");
822                 fclose(tmpfp);
823                 return NULL;
824         }
825
826         src_codeset = prefs_common.force_charset
827                 ? prefs_common.force_charset : mimeinfo->charset;
828
829         renderer = NULL;
830
831         for(cur = renderer_list ; cur != NULL ; cur = cur->next) {
832                 struct ContentRenderer * cr;
833                 cr = cur->data;
834                 if (g_strcasecmp(cr->content_type,
835                                  mimeinfo->content_type) == 0) {
836                         renderer = cr;
837                         break;
838                 }
839         }
840
841         if (renderer != NULL) {
842                 FILE * p;
843                 int oldout;
844                 
845                 oldout = dup(1);
846                 
847                 dup2(fileno(outfp), 1);
848                 
849                 p = popen(renderer->renderer, "w");
850                 if (p != NULL) {
851                         size_t count;
852                         
853                         while ((count =
854                                 fread(buf, sizeof(char), sizeof(buf),
855                                       tmpfp)) > 0)
856                                 fwrite(buf, sizeof(char), count, p);
857                         pclose(p);
858                 }
859                 
860                 dup2(oldout, 1);
861         } else if (mimeinfo->mime_type == MIME_TEXT) {
862                 while (fgets(buf, sizeof(buf), tmpfp) != NULL) {
863                         str = conv_codeset_strdup(buf, src_codeset, NULL);
864                         if (str) {
865                                 fputs(str, outfp);
866                                 g_free(str);
867                         } else {
868                                 conv_fail = TRUE;
869                                 fputs(buf, outfp);
870                         }
871                 }
872         } else if (mimeinfo->mime_type == MIME_TEXT_HTML) {
873                 HTMLParser *parser;
874                 CodeConverter *conv;
875
876                 conv = conv_code_converter_new(src_codeset);
877                 parser = html_parser_new(tmpfp, conv);
878                 while ((str = html_parse(parser)) != NULL) {
879                         fputs(str, outfp);
880                 }
881                 html_parser_destroy(parser);
882                 conv_code_converter_destroy(conv);
883         } else if (mimeinfo->mime_type == MIME_TEXT_ENRICHED) {
884                 ERTFParser *parser;
885                 CodeConverter *conv;
886
887                 conv = conv_code_converter_new(src_codeset);
888                 parser = ertf_parser_new(tmpfp, conv);
889                 while ((str = ertf_parse(parser)) != NULL) {
890                         fputs(str, outfp);
891                 }
892                 ertf_parser_destroy(parser);
893                 conv_code_converter_destroy(conv);
894         }
895
896         if (conv_fail)
897                 g_warning("procmime_get_text_content(): Code conversion failed.\n");
898
899         fclose(tmpfp);
900         rewind(outfp);
901
902         return outfp;
903 }
904
905 /* search the first text part of (multipart) MIME message,
906    decode, convert it and output to outfp. */
907 FILE *procmime_get_first_text_content(MsgInfo *msginfo)
908 {
909         FILE *infp, *outfp = NULL;
910         MimeInfo *mimeinfo, *partinfo;
911
912         g_return_val_if_fail(msginfo != NULL, NULL);
913
914         mimeinfo = procmime_scan_message(msginfo);
915         if (!mimeinfo) return NULL;
916
917         if ((infp = procmsg_open_message(msginfo)) == NULL) {
918                 procmime_mimeinfo_free_all(mimeinfo);
919                 return NULL;
920         }
921
922         partinfo = mimeinfo;
923         while (partinfo && partinfo->mime_type != MIME_TEXT)
924                 partinfo = procmime_mimeinfo_next(partinfo);
925         if (!partinfo) {
926                 partinfo = mimeinfo;
927                 while (partinfo && partinfo->mime_type != MIME_TEXT_HTML &&
928                                 partinfo->mime_type != MIME_TEXT_ENRICHED)
929                         partinfo = procmime_mimeinfo_next(partinfo);
930         }
931         
932
933         if (partinfo)
934                 outfp = procmime_get_text_content(partinfo, infp);
935
936         fclose(infp);
937         procmime_mimeinfo_free_all(mimeinfo);
938
939         return outfp;
940 }
941
942 gboolean procmime_find_string_part(MimeInfo *mimeinfo, const gchar *filename,
943                                    const gchar *str, gboolean case_sens)
944 {
945
946         FILE *infp, *outfp;
947         gchar buf[BUFFSIZE];
948         gchar *(* StrFindFunc) (const gchar *haystack, const gchar *needle);
949
950         g_return_val_if_fail(mimeinfo != NULL, FALSE);
951         g_return_val_if_fail(mimeinfo->mime_type == MIME_TEXT ||
952                              mimeinfo->mime_type == MIME_TEXT_HTML ||
953                              mimeinfo->mime_type == MIME_TEXT_ENRICHED, FALSE);
954         g_return_val_if_fail(str != NULL, FALSE);
955
956         if ((infp = fopen(filename, "rb")) == NULL) {
957                 FILE_OP_ERROR(filename, "fopen");
958                 return FALSE;
959         }
960
961         outfp = procmime_get_text_content(mimeinfo, infp);
962         fclose(infp);
963
964         if (!outfp)
965                 return FALSE;
966
967         if (case_sens)
968                 StrFindFunc = strstr;
969         else
970                 StrFindFunc = strcasestr;
971
972         while (fgets(buf, sizeof(buf), outfp) != NULL) {
973                 if (StrFindFunc(buf, str) != NULL) {
974                         fclose(outfp);
975                         return TRUE;
976                 }
977         }
978
979         fclose(outfp);
980
981         return FALSE;
982 }
983
984 gboolean procmime_find_string(MsgInfo *msginfo, const gchar *str,
985                               gboolean case_sens)
986 {
987         MimeInfo *mimeinfo;
988         MimeInfo *partinfo;
989         gchar *filename;
990         gboolean found = FALSE;
991
992         g_return_val_if_fail(msginfo != NULL, FALSE);
993         g_return_val_if_fail(str != NULL, FALSE);
994
995         filename = procmsg_get_message_file(msginfo);
996         if (!filename) return FALSE;
997         mimeinfo = procmime_scan_message(msginfo);
998
999         for (partinfo = mimeinfo; partinfo != NULL;
1000              partinfo = procmime_mimeinfo_next(partinfo)) {
1001                 if (partinfo->mime_type == MIME_TEXT ||
1002                     partinfo->mime_type == MIME_TEXT_HTML ||
1003                     partinfo->mime_type == MIME_TEXT_ENRICHED) {
1004                         if (procmime_find_string_part
1005                                 (partinfo, filename, str, case_sens) == TRUE) {
1006                                 found = TRUE;
1007                                 break;
1008                         }
1009                 }
1010         }
1011
1012         procmime_mimeinfo_free_all(mimeinfo);
1013         g_free(filename);
1014
1015         return found;
1016 }
1017
1018 gchar *procmime_get_tmp_file_name(MimeInfo *mimeinfo)
1019 {
1020         static guint32 id = 0;
1021         gchar *base;
1022         gchar *filename;
1023         gchar f_prefix[10];
1024
1025         g_return_val_if_fail(mimeinfo != NULL, NULL);
1026
1027         g_snprintf(f_prefix, sizeof(f_prefix), "%08x.", id++);
1028
1029         if (MIME_TEXT_HTML == mimeinfo->mime_type)
1030                 base = "mimetmp.html";
1031         else {
1032                 base = mimeinfo->filename ? mimeinfo->filename
1033                         : mimeinfo->name ? mimeinfo->name : "mimetmp";
1034                 base = g_basename(base);
1035                 if (*base == '\0') base = "mimetmp";
1036                 Xstrdup_a(base, base, return NULL);
1037                 subst_for_filename(base);
1038         }
1039
1040         filename = g_strconcat(get_mime_tmp_dir(), G_DIR_SEPARATOR_S,
1041                                f_prefix, base, NULL);
1042
1043         return filename;
1044 }
1045
1046 ContentType procmime_scan_mime_type(const gchar *mime_type)
1047 {
1048         ContentType type;
1049
1050         if (!strncasecmp(mime_type, "text/html", 9))
1051                 type = MIME_TEXT_HTML;
1052         else if (!strncasecmp(mime_type, "text/enriched", 13))
1053                 type = MIME_TEXT_ENRICHED;
1054         else if (!strncasecmp(mime_type, "text/", 5))
1055                 type = MIME_TEXT;
1056         else if (!strncasecmp(mime_type, "message/rfc822", 14))
1057                 type = MIME_MESSAGE_RFC822;
1058         else if (!strncasecmp(mime_type, "message/", 8))
1059                 type = MIME_TEXT;
1060         else if (!strncasecmp(mime_type, "application/octet-stream", 24))
1061                 type = MIME_APPLICATION_OCTET_STREAM;
1062         else if (!strncasecmp(mime_type, "application/", 12))
1063                 type = MIME_APPLICATION;
1064         else if (!strncasecmp(mime_type, "multipart/", 10))
1065                 type = MIME_MULTIPART;
1066         else if (!strncasecmp(mime_type, "image/", 6))
1067                 type = MIME_IMAGE;
1068         else if (!strncasecmp(mime_type, "audio/", 6))
1069                 type = MIME_AUDIO;
1070         else if (!strcasecmp(mime_type, "text"))
1071                 type = MIME_TEXT;
1072         else
1073                 type = MIME_UNKNOWN;
1074
1075         return type;
1076 }
1077
1078 static GList *mime_type_list = NULL;
1079
1080 gchar *procmime_get_mime_type(const gchar *filename)
1081 {
1082         static GHashTable *mime_type_table = NULL;
1083         MimeType *mime_type;
1084         const gchar *p;
1085         gchar *ext;
1086
1087         if (!mime_type_table) {
1088                 mime_type_table = procmime_get_mime_type_table();
1089                 if (!mime_type_table) return NULL;
1090         }
1091
1092         filename = g_basename(filename);
1093         p = strrchr(filename, '.');
1094         if (!p) return NULL;
1095
1096         Xstrdup_a(ext, p + 1, return NULL);
1097         g_strdown(ext);
1098         mime_type = g_hash_table_lookup(mime_type_table, ext);
1099         if (mime_type) {
1100                 gchar *str;
1101
1102                 str = g_strconcat(mime_type->type, "/", mime_type->sub_type,
1103                                   NULL);
1104                 return str;
1105         }
1106
1107         return NULL;
1108 }
1109
1110 static guint procmime_str_hash(gconstpointer gptr)
1111 {
1112         guint hash_result = 0;
1113         const char *str;
1114
1115         for (str = gptr; str && *str; str++) {
1116                 if (isupper(*str)) hash_result += (*str + ' ');
1117                 else hash_result += *str;
1118         }
1119
1120         return hash_result;
1121 }
1122
1123 static gint procmime_str_equal(gconstpointer gptr1, gconstpointer gptr2)
1124 {
1125         const char *str1 = gptr1;
1126         const char *str2 = gptr2;
1127
1128         return !strcasecmp(str1, str2);
1129 }
1130
1131 static GHashTable *procmime_get_mime_type_table(void)
1132 {
1133         GHashTable *table = NULL;
1134         GList *cur;
1135         MimeType *mime_type;
1136         gchar **exts;
1137
1138         if (!mime_type_list) {
1139                 mime_type_list = procmime_get_mime_type_list();
1140                 if (!mime_type_list) return NULL;
1141         }
1142
1143         table = g_hash_table_new(procmime_str_hash, procmime_str_equal);
1144
1145         for (cur = mime_type_list; cur != NULL; cur = cur->next) {
1146                 gint i;
1147                 gchar *key;
1148
1149                 mime_type = (MimeType *)cur->data;
1150
1151                 if (!mime_type->extension) continue;
1152
1153                 exts = g_strsplit(mime_type->extension, " ", 16);
1154                 for (i = 0; exts[i] != NULL; i++) {
1155                         /* make the key case insensitive */
1156                         g_strdown(exts[i]);
1157                         /* use previously dup'd key on overwriting */
1158                         if (g_hash_table_lookup(table, exts[i]))
1159                                 key = exts[i];
1160                         else
1161                                 key = g_strdup(exts[i]);
1162                         g_hash_table_insert(table, key, mime_type);
1163                 }
1164                 g_strfreev(exts);
1165         }
1166
1167         return table;
1168 }
1169
1170 GList *procmime_get_mime_type_list(void)
1171 {
1172         GList *list = NULL;
1173         FILE *fp;
1174         gchar buf[BUFFSIZE];
1175         gchar *p, *delim;
1176         MimeType *mime_type;
1177
1178         if (mime_type_list) 
1179                 return mime_type_list;
1180
1181         if ((fp = fopen("/etc/mime.types", "rb")) == NULL) {
1182                 if ((fp = fopen(SYSCONFDIR "/mime.types", "rb")) == NULL) {
1183                         FILE_OP_ERROR(SYSCONFDIR "/mime.types", "fopen");
1184                         return NULL;
1185                 }
1186         }
1187
1188         while (fgets(buf, sizeof(buf), fp) != NULL) {
1189                 p = strchr(buf, '#');
1190                 if (p) *p = '\0';
1191                 g_strstrip(buf);
1192
1193                 p = buf;
1194                 while (*p && !isspace(*p)) p++;
1195                 if (*p) {
1196                         *p = '\0';
1197                         p++;
1198                 }
1199                 delim = strchr(buf, '/');
1200                 if (delim == NULL) continue;
1201                 *delim = '\0';
1202
1203                 mime_type = g_new(MimeType, 1);
1204                 mime_type->type = g_strdup(buf);
1205                 mime_type->sub_type = g_strdup(delim + 1);
1206
1207                 while (*p && isspace(*p)) p++;
1208                 if (*p)
1209                         mime_type->extension = g_strdup(p);
1210                 else
1211                         mime_type->extension = NULL;
1212
1213                 list = g_list_append(list, mime_type);
1214         }
1215
1216         fclose(fp);
1217
1218         if (!list)
1219                 g_warning("Can't read mime.types\n");
1220
1221         return list;
1222 }
1223
1224 EncodingType procmime_get_encoding_for_charset(const gchar *charset)
1225 {
1226         if (!charset)
1227                 return ENC_8BIT;
1228         else if (!strncasecmp(charset, "ISO-2022-", 9) ||
1229                  !strcasecmp(charset, "US-ASCII"))
1230                 return ENC_7BIT;
1231         else if (!strcasecmp(charset, "ISO-8859-5") ||
1232                  !strncasecmp(charset, "KOI8-", 5) ||
1233                  !strcasecmp(charset, "Windows-1251"))
1234                 return ENC_8BIT;
1235         else if (!strncasecmp(charset, "ISO-8859-", 9))
1236                 return ENC_QUOTED_PRINTABLE;
1237         else
1238                 return ENC_8BIT;
1239 }
1240
1241 EncodingType procmime_get_encoding_for_file(const gchar *file)
1242 {
1243         FILE *fp;
1244         guchar buf[BUFSIZ];
1245         size_t len;
1246
1247         if ((fp = fopen(file, "rb")) == NULL) {
1248                 FILE_OP_ERROR(file, "fopen");
1249                 return ENC_UNKNOWN;
1250         }
1251
1252         while ((len = fread(buf, sizeof(gchar), sizeof(buf), fp)) > 0) {
1253                 guchar *p;
1254                 gint i;
1255
1256                 for (p = buf, i = 0; i < len; p++, i++) {
1257                         if (*p & 0x80) {
1258                                 fclose(fp);
1259                                 return ENC_BASE64;
1260                         }
1261                 }
1262         }
1263
1264         fclose(fp);
1265         return ENC_7BIT;
1266 }
1267
1268 struct EncodingTable 
1269 {
1270         gchar *str;
1271         EncodingType enc_type;
1272 };
1273
1274 struct EncodingTable encoding_table[] = {
1275         {"7bit", ENC_7BIT},
1276         {"8bit", ENC_8BIT},
1277         {"binary", ENC_BINARY},
1278         {"quoted-printable", ENC_QUOTED_PRINTABLE},
1279         {"base64", ENC_BASE64},
1280         {"x-uuencode", ENC_UNKNOWN},
1281         {NULL, ENC_UNKNOWN},
1282 };
1283
1284 const gchar *procmime_get_encoding_str(EncodingType encoding)
1285 {
1286         struct EncodingTable *enc_table;
1287         
1288         for (enc_table = encoding_table; enc_table->str != NULL; enc_table++) {
1289                 if (enc_table->enc_type == encoding)
1290                         return enc_table->str;
1291         }
1292         return NULL;
1293 }