ad7011faff14ed7bc6133fd56dcad9b4a919ffb9
[claws.git] / src / procmime.c
1 /*
2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
3  * Copyright (C) 1999-2002 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 "uuencode.h"
37 #include "unmime.h"
38 #include "html.h"
39 #include "enriched.h"
40 #include "codeconv.h"
41 #include "utils.h"
42 #include "prefs_common.h"
43
44 #if USE_GPGME
45 #  include "rfc2015.h"
46 #endif
47
48 #include "prefs.h"
49
50 static GHashTable *procmime_get_mime_type_table (void);
51
52 MimeInfo *procmime_mimeinfo_new(void)
53 {
54         MimeInfo *mimeinfo;
55
56         mimeinfo = g_new0(MimeInfo, 1);
57         mimeinfo->mime_type     = MIME_UNKNOWN;
58         mimeinfo->encoding_type = ENC_UNKNOWN;
59
60         return mimeinfo;
61 }
62
63 void procmime_mimeinfo_free(MimeInfo *mimeinfo)
64 {
65         if (!mimeinfo) return;
66
67         g_free(mimeinfo->encoding);
68         g_free(mimeinfo->content_type);
69         g_free(mimeinfo->charset);
70         g_free(mimeinfo->name);
71         g_free(mimeinfo->boundary);
72         g_free(mimeinfo->content_disposition);
73         g_free(mimeinfo->filename);
74 #if USE_GPGME
75         g_free(mimeinfo->plaintextfile);
76         g_free(mimeinfo->sigstatus);
77         g_free(mimeinfo->sigstatus_full);
78 #endif
79
80         procmime_mimeinfo_free(mimeinfo->sub);
81
82         g_free(mimeinfo);
83 }
84
85 void procmime_mimeinfo_free_all(MimeInfo *mimeinfo)
86 {
87         while (mimeinfo != NULL) {
88                 MimeInfo *next;
89
90                 g_free(mimeinfo->encoding);
91                 g_free(mimeinfo->content_type);
92                 g_free(mimeinfo->charset);
93                 g_free(mimeinfo->name);
94                 g_free(mimeinfo->boundary);
95                 g_free(mimeinfo->content_disposition);
96                 g_free(mimeinfo->filename);
97 #if USE_GPGME
98                 g_free(mimeinfo->plaintextfile);
99                 g_free(mimeinfo->sigstatus);
100                 g_free(mimeinfo->sigstatus_full);
101 #endif
102
103                 procmime_mimeinfo_free_all(mimeinfo->sub);
104                 procmime_mimeinfo_free_all(mimeinfo->children);
105 #if USE_GPGME
106                 procmime_mimeinfo_free_all(mimeinfo->plaintext);
107 #endif
108
109                 next = mimeinfo->next;
110                 g_free(mimeinfo);
111                 mimeinfo = next;
112         }
113 }
114
115 MimeInfo *procmime_mimeinfo_insert(MimeInfo *parent, MimeInfo *mimeinfo)
116 {
117         MimeInfo *child = parent->children;
118
119         if (!child)
120                 parent->children = mimeinfo;
121         else {
122                 while (child->next != NULL)
123                         child = child->next;
124
125                 child->next = mimeinfo;
126         }
127
128         mimeinfo->parent = parent;
129         mimeinfo->level = parent->level + 1;
130
131         return mimeinfo;
132 }
133
134 void procmime_mimeinfo_replace(MimeInfo *old, MimeInfo *new)
135 {
136         MimeInfo *parent = old->parent;
137         MimeInfo *child;
138
139         g_return_if_fail(parent != NULL);
140         g_return_if_fail(new->next == NULL);
141
142         for (child = parent->children; child && child != old;
143              child = child->next)
144                 ;
145         if (!child) {
146                 g_warning("oops: parent can't find it's own child");
147                 return;
148         }
149         procmime_mimeinfo_free_all(old);
150
151         if (child == parent->children) {
152                 new->next = parent->children->next;
153                 parent->children = new;
154         } else {
155                 new->next = child->next;
156                 child = new;
157         }
158 }
159
160 MimeInfo *procmime_mimeinfo_next(MimeInfo *mimeinfo)
161 {
162         if (!mimeinfo) return NULL;
163
164         if (mimeinfo->children)
165                 return mimeinfo->children;
166         if (mimeinfo->sub)
167                 return mimeinfo->sub;
168         if (mimeinfo->next)
169                 return mimeinfo->next;
170
171         if (mimeinfo->main) {
172                 mimeinfo = mimeinfo->main;
173                 if (mimeinfo->next)
174                         return mimeinfo->next;
175         }
176
177         for (mimeinfo = mimeinfo->parent; mimeinfo != NULL;
178              mimeinfo = mimeinfo->parent) {
179                 if (mimeinfo->next)
180                         return mimeinfo->next;
181                 if (mimeinfo->main) {
182                         mimeinfo = mimeinfo->main;
183                         if (mimeinfo->next)
184                                 return mimeinfo->next;
185                 }
186         }
187
188         return NULL;
189 }
190
191 MimeInfo *procmime_scan_message(MsgInfo *msginfo)
192 {
193         FILE *fp;
194         MimeInfo *mimeinfo;
195
196         g_return_val_if_fail(msginfo != NULL, NULL);
197
198         if ((fp = procmsg_open_message(msginfo)) == NULL) return NULL;
199         mimeinfo = procmime_scan_mime_header(fp);
200
201         if (mimeinfo) {
202                 if (mimeinfo->mime_type != MIME_MULTIPART) {
203                         if (fseek(fp, mimeinfo->fpos, SEEK_SET) < 0)
204                                 perror("fseek");
205                 }
206                 if (mimeinfo->mime_type != MIME_TEXT)
207                         procmime_scan_multipart_message(mimeinfo, fp);
208         }
209
210 #if USE_GPGME
211         if (prefs_common.auto_check_signatures)
212                 rfc2015_check_signature(mimeinfo, fp);
213 #endif
214         fclose(fp);
215
216         return mimeinfo;
217 }
218
219 void procmime_scan_multipart_message(MimeInfo *mimeinfo, FILE *fp)
220 {
221         gchar *p;
222         gchar *boundary;
223         gint boundary_len = 0;
224         gchar buf[BUFFSIZE];
225         glong fpos, prev_fpos;
226         gint npart;
227
228         g_return_if_fail(mimeinfo != NULL);
229         g_return_if_fail(mimeinfo->mime_type != MIME_TEXT);
230
231         if (mimeinfo->mime_type == MIME_MULTIPART) {
232                 g_return_if_fail(mimeinfo->boundary != NULL);
233                 g_return_if_fail(mimeinfo->sub == NULL);
234         }
235         g_return_if_fail(fp != NULL);
236
237         boundary = mimeinfo->boundary;
238
239         if (boundary) {
240                 boundary_len = strlen(boundary);
241
242                 /* look for first boundary */
243                 while ((p = fgets(buf, sizeof(buf), fp)) != NULL)
244                         if (IS_BOUNDARY(buf, boundary, boundary_len)) break;
245                 if (!p) return;
246         }
247
248         if ((fpos = ftell(fp)) < 0) {
249                 perror("ftell");
250                 return;
251         }
252
253         for (npart = 0;; npart++) {
254                 MimeInfo *partinfo;
255                 gboolean eom = FALSE;
256
257                 prev_fpos = fpos;
258                 debug_print("prev_fpos: %ld\n", fpos);
259
260                 partinfo = procmime_scan_mime_header(fp);
261                 if (!partinfo) break;
262                 procmime_mimeinfo_insert(mimeinfo, partinfo);
263
264                 if (partinfo->mime_type == MIME_MULTIPART) {
265                         if (partinfo->level < 8)
266                                 procmime_scan_multipart_message(partinfo, fp);
267                 } else if (partinfo->mime_type == MIME_MESSAGE_RFC822) {
268                         MimeInfo *sub;
269
270                         partinfo->sub = sub = procmime_scan_mime_header(fp);
271                         if (!sub) break;
272
273                         sub->level = partinfo->level + 1;
274                         sub->parent = partinfo;
275                         sub->main = partinfo;
276
277                         if (sub->level < 8) {
278                                 if (sub->mime_type == MIME_MULTIPART) {
279                                         procmime_scan_multipart_message
280                                                 (sub, fp);
281                                 } else if (sub->mime_type == MIME_MESSAGE_RFC822) {
282                                         fseek(fp, sub->fpos, SEEK_SET);
283                                         procmime_scan_multipart_message
284                                                 (sub, fp);
285                                 }
286                         }
287                 }
288
289                 /* look for next boundary */
290                 buf[0] = '\0';
291                 while ((p = fgets(buf, sizeof(buf), fp)) != NULL) {
292                         if (IS_BOUNDARY(buf, boundary, boundary_len)) {
293                                 if (buf[2 + boundary_len]     == '-' &&
294                                     buf[2 + boundary_len + 1] == '-')
295                                         eom = TRUE;
296                                 break;
297                         }
298                 }
299                 if (p == NULL) {
300                         /* broken MIME, or single part MIME message */
301                         buf[0] = '\0';
302                         eom = TRUE;
303                 }
304                 fpos = ftell(fp);
305                 debug_print("fpos: %ld\n", fpos);
306
307                 partinfo->size = fpos - prev_fpos - strlen(buf);
308                 debug_print("partinfo->size: %d\n", partinfo->size);
309                 if (partinfo->sub && !partinfo->sub->sub &&
310                     !partinfo->sub->children) {
311                         partinfo->sub->size = fpos - partinfo->sub->fpos - strlen(buf);
312                         debug_print("partinfo->sub->size: %d\n",
313                                     partinfo->sub->size);
314                 }
315                 debug_print("boundary: %s\n", buf);
316
317                 if (eom) break;
318         }
319 }
320
321 void procmime_scan_encoding(MimeInfo *mimeinfo, const gchar *encoding)
322 {
323         gchar *buf;
324
325         Xstrdup_a(buf, encoding, return);
326
327         g_free(mimeinfo->encoding);
328
329         mimeinfo->encoding = g_strdup(g_strstrip(buf));
330         if (!strcasecmp(buf, "7bit"))
331                 mimeinfo->encoding_type = ENC_7BIT;
332         else if (!strcasecmp(buf, "8bit"))
333                 mimeinfo->encoding_type = ENC_8BIT;
334         else if (!strcasecmp(buf, "quoted-printable"))
335                 mimeinfo->encoding_type = ENC_QUOTED_PRINTABLE;
336         else if (!strcasecmp(buf, "base64"))
337                 mimeinfo->encoding_type = ENC_BASE64;
338         else if (!strcasecmp(buf, "x-uuencode"))
339                 mimeinfo->encoding_type = ENC_X_UUENCODE;
340         else
341                 mimeinfo->encoding_type = ENC_UNKNOWN;
342
343 }
344
345 void procmime_scan_content_type(MimeInfo *mimeinfo, const gchar *content_type)
346 {
347         gchar *delim, *p, *cnttype;
348         gchar *buf;
349
350         if (conv_get_current_charset() == C_EUC_JP &&
351             strchr(content_type, '\033')) {
352                 gint len;
353                 len = strlen(content_type) * 2 + 1;
354                 Xalloca(buf, len, return);
355                 conv_jistoeuc(buf, len, content_type);
356         } else
357                 Xstrdup_a(buf, content_type, return);
358
359         g_free(mimeinfo->content_type);
360         g_free(mimeinfo->charset);
361         /* g_free(mimeinfo->name); */
362         mimeinfo->content_type = NULL;
363         mimeinfo->charset      = NULL;
364         /* mimeinfo->name      = NULL; */
365
366         if ((delim = strchr(buf, ';'))) *delim = '\0';
367         mimeinfo->content_type = cnttype = g_strdup(g_strstrip(buf));
368
369         mimeinfo->mime_type = procmime_scan_mime_type(cnttype);
370
371         if (!delim) return;
372         p = delim + 1;
373
374         for (;;) {
375                 gchar *eq;
376                 gchar *attr, *value;
377
378                 if ((delim = strchr(p, ';'))) *delim = '\0';
379
380                 if (!(eq = strchr(p, '='))) break;
381
382                 *eq = '\0';
383                 attr = p;
384                 g_strstrip(attr);
385                 value = eq + 1;
386                 g_strstrip(value);
387
388                 if (*value == '"')
389                         extract_quote(value, '"');
390                 else {
391                         eliminate_parenthesis(value, '(', ')');
392                         g_strstrip(value);
393                 }
394
395                 if (*value) {
396                         if (!strcasecmp(attr, "charset"))
397                                 mimeinfo->charset = g_strdup(value);
398                         else if (!strcasecmp(attr, "name")) {
399                                 gchar *tmp;
400                                 size_t len;
401
402                                 len = strlen(value) + 1;
403                                 Xalloca(tmp, len, return);
404                                 conv_unmime_header(tmp, len, value, NULL);
405                                 g_free(mimeinfo->name);
406                                 /*pgp signatures should NOT have a name */
407                                 if (mimeinfo->content_type 
408                                 &&  strcasecmp(mimeinfo->content_type, "application/pgp-signature"))
409                                         mimeinfo->name = g_strdup(tmp);
410                         } else if (!strcasecmp(attr, "boundary"))
411                                 mimeinfo->boundary = g_strdup(value);
412                 }
413
414                 if (!delim) break;
415                 p = delim + 1;
416         }
417
418         if (mimeinfo->mime_type == MIME_MULTIPART && !mimeinfo->boundary)
419                 mimeinfo->mime_type = MIME_TEXT;
420 }
421
422 void procmime_scan_content_disposition(MimeInfo *mimeinfo,
423                                        const gchar *content_disposition)
424 {
425         gchar *delim, *p, *dispos;
426         gchar *buf;
427
428         if (conv_get_current_charset() == C_EUC_JP &&
429             strchr(content_disposition, '\033')) {
430                 gint len;
431                 len = strlen(content_disposition) * 2 + 1;
432                 Xalloca(buf, len, return);
433                 conv_jistoeuc(buf, len, content_disposition);
434         } else
435                 Xstrdup_a(buf, content_disposition, return);
436
437         if ((delim = strchr(buf, ';'))) *delim = '\0';
438         mimeinfo->content_disposition = dispos = g_strdup(g_strstrip(buf));
439
440         if (!delim) return;
441         p = delim + 1;
442
443         for (;;) {
444                 gchar *eq;
445                 gchar *attr, *value;
446
447                 if ((delim = strchr(p, ';'))) *delim = '\0';
448
449                 if (!(eq = strchr(p, '='))) break;
450
451                 *eq = '\0';
452                 attr = p;
453                 g_strstrip(attr);
454                 value = eq + 1;
455                 g_strstrip(value);
456
457                 if (*value == '"')
458                         extract_quote(value, '"');
459                 else {
460                         eliminate_parenthesis(value, '(', ')');
461                         g_strstrip(value);
462                 }
463
464                 if (*value) {
465                         if (!strcasecmp(attr, "filename")) {
466                                 gchar *tmp;
467                                 size_t len;
468
469                                 len = strlen(value) + 1;
470                                 Xalloca(tmp, len, return);
471                                 conv_unmime_header(tmp, len, value, NULL);
472                                 g_free(mimeinfo->filename);
473                                 /*pgp signatures should NOT have a name */
474                                 if (mimeinfo->content_type 
475                                 &&  strcasecmp(mimeinfo->content_type, "application/pgp-signature"))
476                                         mimeinfo->filename = g_strdup(tmp);
477                                 break;
478                         }
479                 }
480
481                 if (!delim) break;
482                 p = delim + 1;
483         }
484 }
485
486 void procmime_scan_content_description(MimeInfo *mimeinfo,
487                                        const gchar *content_description)
488 {
489         gchar *buf;
490
491         gchar *tmp;
492         size_t blen;
493
494         if (conv_get_current_charset() == C_EUC_JP &&
495             strchr(content_description, '\033')) {
496                 gint len;
497                 len = strlen(content_description) * 2 + 1;
498                 Xalloca(buf, len, return);
499                 conv_jistoeuc(buf, len, content_description);
500         } else
501                 Xstrdup_a(buf, content_description, return);
502         
503         blen = strlen(buf) + 1;
504         Xalloca(tmp, blen, return);
505         conv_unmime_header(tmp, blen, buf, NULL);
506         g_free(mimeinfo->name);
507         /*pgp signatures should NOT have a name */
508         if (mimeinfo->content_type 
509         &&  strcasecmp(mimeinfo->content_type, "application/pgp-signature"))
510                 mimeinfo->name = g_strdup(tmp);
511 }
512
513 void procmime_scan_subject(MimeInfo *mimeinfo,
514                            const gchar *subject)
515 {
516         gchar *buf;
517
518         gchar *tmp;
519         size_t blen;
520
521         if (conv_get_current_charset() == C_EUC_JP &&
522             strchr(subject, '\033')) {
523                 gint len;
524                 len = strlen(subject) * 2 + 1;
525                 Xalloca(buf, len, return);
526                 conv_jistoeuc(buf, len, subject);
527         } else
528                 Xstrdup_a(buf, subject, return);
529         
530         blen = strlen(buf) + 1;
531         Xalloca(tmp, blen, return);
532         conv_unmime_header(tmp, blen, buf, NULL);
533         g_free(mimeinfo->name);
534         mimeinfo->name = g_strdup(tmp);
535 }
536
537 enum
538 {
539         H_CONTENT_TRANSFER_ENCODING = 0,
540         H_CONTENT_TYPE              = 1,
541         H_CONTENT_DISPOSITION       = 2,
542         H_CONTENT_DESCRIPTION       = 3,
543         H_SUBJECT                   = 4
544 };
545
546 MimeInfo *procmime_scan_mime_header(FILE *fp)
547 {
548         static HeaderEntry hentry[] = {{"Content-Transfer-Encoding:",
549                                                           NULL, FALSE},
550                                        {"Content-Type:", NULL, TRUE},
551                                        {"Content-Disposition:",
552                                                           NULL, TRUE},
553                                        {"Content-description:",
554                                                           NULL, TRUE},
555                                        {"Subject:",
556                                                           NULL, TRUE},
557                                        {NULL,             NULL, FALSE}};
558         gchar buf[BUFFSIZE];
559         gint hnum;
560         HeaderEntry *hp;
561         MimeInfo *mimeinfo;
562
563         g_return_val_if_fail(fp != NULL, NULL);
564
565         mimeinfo = procmime_mimeinfo_new();
566         mimeinfo->mime_type = MIME_TEXT;
567         mimeinfo->encoding_type = ENC_7BIT;
568         mimeinfo->fpos = ftell(fp);
569
570         while ((hnum = procheader_get_one_field(buf, sizeof(buf), fp, hentry))
571                != -1) {
572                 hp = hentry + hnum;
573
574                 if (H_CONTENT_TRANSFER_ENCODING == hnum) {
575                         procmime_scan_encoding
576                                 (mimeinfo, buf + strlen(hp->name));
577                 } else if (H_CONTENT_TYPE == hnum) {
578                         procmime_scan_content_type
579                                 (mimeinfo, buf + strlen(hp->name));
580                 } else if (H_CONTENT_DISPOSITION == hnum) {
581                         procmime_scan_content_disposition
582                                 (mimeinfo, buf + strlen(hp->name));
583                 } else if (H_CONTENT_DESCRIPTION == hnum) {
584                         procmime_scan_content_description
585                                 (mimeinfo, buf + strlen(hp->name));
586                 } else if (H_SUBJECT == hnum) {
587                         procmime_scan_subject
588                                 (mimeinfo, buf + strlen(hp->name));
589                 }
590         }
591
592         if (mimeinfo->mime_type == MIME_APPLICATION_OCTET_STREAM &&
593             mimeinfo->name) {
594                 const gchar *type;
595                 type = procmime_get_mime_type(mimeinfo->name);
596                 if (type)
597                         mimeinfo->mime_type = procmime_scan_mime_type(type);
598         }
599
600         if (!mimeinfo->content_type)
601                         mimeinfo->content_type = g_strdup("text/plain");
602
603         return mimeinfo;
604 }
605
606 FILE *procmime_decode_content(FILE *outfp, FILE *infp, MimeInfo *mimeinfo)
607 {
608         gchar buf[BUFFSIZE];
609         gchar *boundary = NULL;
610         gint boundary_len = 0;
611         gboolean tmp_file = FALSE;
612
613         g_return_val_if_fail(infp != NULL, NULL);
614         g_return_val_if_fail(mimeinfo != NULL, NULL);
615
616         if (!outfp) {
617                 outfp = my_tmpfile();
618                 if (!outfp) {
619                         perror("tmpfile");
620                         return NULL;
621                 }
622                 tmp_file = TRUE;
623         }
624
625         if (mimeinfo->parent && mimeinfo->parent->boundary) {
626                 boundary = mimeinfo->parent->boundary;
627                 boundary_len = strlen(boundary);
628         }
629
630         if (mimeinfo->encoding_type == ENC_QUOTED_PRINTABLE) {
631                 while (fgets(buf, sizeof(buf), infp) != NULL &&
632                        (!boundary ||
633                         !IS_BOUNDARY(buf, boundary, boundary_len))) {
634                         gint len;
635                         len = unmime_quoted_printable_line(buf);
636                         fwrite(buf, len, 1, outfp);
637                 }
638         } else if (mimeinfo->encoding_type == ENC_BASE64) {
639                 gchar outbuf[BUFFSIZE];
640                 gint len;
641                 Base64Decoder *decoder;
642
643                 decoder = base64_decoder_new();
644                 while (fgets(buf, sizeof(buf), infp) != NULL &&
645                        (!boundary ||
646                         !IS_BOUNDARY(buf, boundary, boundary_len))) {
647                         len = base64_decoder_decode(decoder, buf, outbuf);
648                         if (len < 0) {
649                                 g_warning("Bad BASE64 content\n");
650                                 break;
651                         }
652                         fwrite(outbuf, sizeof(gchar), len, outfp);
653                 }
654                 base64_decoder_free(decoder);
655         } else if (mimeinfo->encoding_type == ENC_X_UUENCODE) {
656                 gchar outbuf[BUFFSIZE];
657                 gint len;
658                 gboolean flag = FALSE;
659
660                 while (fgets(buf, sizeof(buf), infp) != NULL &&
661                        (!boundary ||
662                         !IS_BOUNDARY(buf, boundary, boundary_len))) {
663                         if(!flag && strncmp(buf,"begin ", 6)) continue;
664
665                         if (flag) {
666                                 len = fromuutobits(outbuf, buf);
667                                 if (len <= 0) {
668                                         if (len < 0) 
669                                                 g_warning("Bad UUENCODE content(%d)\n", len);
670                                         break;
671                                 }
672                                 fwrite(outbuf, sizeof(gchar), len, outfp);
673                         } else
674                                 flag = TRUE;
675                 }
676         } else {
677                 while (fgets(buf, sizeof(buf), infp) != NULL &&
678                        (!boundary ||
679                         !IS_BOUNDARY(buf, boundary, boundary_len))) {
680                         fputs(buf, outfp);
681                 }
682         }
683
684         if (tmp_file) rewind(outfp);
685         return outfp;
686 }
687
688 gint procmime_get_part(const gchar *outfile, const gchar *infile,
689                        MimeInfo *mimeinfo)
690 {
691         FILE *infp, *outfp;
692         gchar buf[BUFFSIZE];
693
694         g_return_val_if_fail(outfile != NULL, -1);
695         g_return_val_if_fail(infile != NULL, -1);
696         g_return_val_if_fail(mimeinfo != NULL, -1);
697
698         if ((infp = fopen(infile, "rb")) == NULL) {
699                 FILE_OP_ERROR(infile, "fopen");
700                 return -1;
701         }
702         if (fseek(infp, mimeinfo->fpos, SEEK_SET) < 0) {
703                 FILE_OP_ERROR(infile, "fseek");
704                 fclose(infp);
705                 return -1;
706         }
707         if ((outfp = fopen(outfile, "wb")) == NULL) {
708                 FILE_OP_ERROR(outfile, "fopen");
709                 fclose(infp);
710                 return -1;
711         }
712
713         while (fgets(buf, sizeof(buf), infp) != NULL)
714                 if (buf[0] == '\r' || buf[0] == '\n') break;
715
716         procmime_decode_content(outfp, infp, mimeinfo);
717
718         fclose(infp);
719         if (fclose(outfp) == EOF) {
720                 FILE_OP_ERROR(outfile, "fclose");
721                 unlink(outfile);
722                 return -1;
723         }
724
725         return 0;
726 }
727
728 struct ContentRenderer {
729         char * content_type;
730         char * renderer;
731 };
732
733 static GList * renderer_list = NULL;
734
735 static struct ContentRenderer *
736 content_renderer_new(char * content_type, char * renderer)
737 {
738         struct ContentRenderer * cr;
739
740         cr = g_new(struct ContentRenderer, 1);
741         if (cr == NULL)
742                 return NULL;
743
744         cr->content_type = g_strdup(content_type);
745         cr->renderer = g_strdup(renderer);
746
747         return cr;
748 }
749
750 static void content_renderer_free(struct ContentRenderer * cr)
751 {
752         g_free(cr->content_type);
753         g_free(cr->renderer);
754         g_free(cr);
755 }
756
757 void renderer_read_config(void)
758 {
759         gchar buf[BUFFSIZE];
760         FILE * f;
761         gchar * rcpath;
762
763         g_list_foreach(renderer_list, (GFunc) content_renderer_free, NULL);
764         renderer_list = NULL;
765
766         rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S, RENDERER_RC, NULL);
767         f = fopen(rcpath, "rb");
768         g_free(rcpath);
769         
770         if (f == NULL)
771                 return;
772
773         while (fgets(buf, BUFFSIZE, f)) {
774                 char * p;
775                 struct ContentRenderer * cr;
776
777                 strretchomp(buf);
778                 p = strchr(buf, ' ');
779                 if (p == NULL)
780                         continue;
781                 * p = 0;
782
783                 cr = content_renderer_new(buf, p + 1);
784                 if (cr == NULL)
785                         continue;
786
787                 renderer_list = g_list_append(renderer_list, cr);
788         }
789
790         fclose(f);
791 }
792
793 void renderer_write_config(void)
794 {
795         gchar * rcpath;
796         PrefFile *pfile;
797         GList * cur;
798
799         rcpath = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S, RENDERER_RC, NULL);
800         
801         if ((pfile = prefs_write_open(rcpath)) == NULL) {
802                 g_warning(_("failed to write configuration to file\n"));
803                 g_free(rcpath);
804                 return;
805         }
806
807         g_free(rcpath);
808
809         for(cur = renderer_list ; cur != NULL ; cur = cur->next) {
810                 struct ContentRenderer * renderer;
811                 renderer = cur->data;
812                 fprintf(pfile->fp, "%s %s\n", renderer->content_type,
813                         renderer->renderer);
814         }
815
816         if (prefs_write_close(pfile) < 0) {
817                 g_warning(_("failed to write configuration to file\n"));
818                 return;
819         }
820 }
821
822 FILE *procmime_get_text_content(MimeInfo *mimeinfo, FILE *infp)
823 {
824         FILE *tmpfp, *outfp;
825         gchar *src_codeset;
826         gboolean conv_fail = FALSE;
827         gchar buf[BUFFSIZE];
828         gchar *str;
829         struct ContentRenderer * renderer;
830         GList * cur;
831
832         g_return_val_if_fail(mimeinfo != NULL, NULL);
833         g_return_val_if_fail(infp != NULL, NULL);
834         g_return_val_if_fail(mimeinfo->mime_type == MIME_TEXT ||
835                              mimeinfo->mime_type == MIME_TEXT_HTML ||
836                              mimeinfo->mime_type == MIME_TEXT_ENRICHED, NULL);
837
838         if (fseek(infp, mimeinfo->fpos, SEEK_SET) < 0) {
839                 perror("fseek");
840                 return NULL;
841         }
842
843         while (fgets(buf, sizeof(buf), infp) != NULL)
844                 if (buf[0] == '\r' || buf[0] == '\n') break;
845
846         tmpfp = procmime_decode_content(NULL, infp, mimeinfo);
847         if (!tmpfp)
848                 return NULL;
849
850         if ((outfp = my_tmpfile()) == NULL) {
851                 perror("tmpfile");
852                 fclose(tmpfp);
853                 return NULL;
854         }
855
856         src_codeset = prefs_common.force_charset
857                 ? prefs_common.force_charset : mimeinfo->charset;
858
859         renderer = NULL;
860
861         for(cur = renderer_list ; cur != NULL ; cur = cur->next) {
862                 struct ContentRenderer * cr;
863                 cr = cur->data;
864                 if (g_strcasecmp(cr->content_type,
865                                  mimeinfo->content_type) == 0) {
866                         renderer = cr;
867                         break;
868                 }
869         }
870
871         if (renderer != NULL) {
872                 FILE * p;
873                 int oldout;
874                 
875                 oldout = dup(1);
876                 
877                 dup2(fileno(outfp), 1);
878                 
879                 p = popen(renderer->renderer, "w");
880                 if (p != NULL) {
881                         size_t count;
882                         
883                         while ((count =
884                                 fread(buf, sizeof(char), sizeof(buf),
885                                       tmpfp)) > 0)
886                                 fwrite(buf, sizeof(char), count, p);
887                         pclose(p);
888                 }
889                 
890                 dup2(oldout, 1);
891         } else if (mimeinfo->mime_type == MIME_TEXT) {
892                 while (fgets(buf, sizeof(buf), tmpfp) != NULL) {
893                         str = conv_codeset_strdup(buf, src_codeset, NULL);
894                         if (str) {
895                                 fputs(str, outfp);
896                                 g_free(str);
897                         } else {
898                                 conv_fail = TRUE;
899                                 fputs(buf, outfp);
900                         }
901                 }
902         } else if (mimeinfo->mime_type == MIME_TEXT_HTML) {
903                 HTMLParser *parser;
904                 CodeConverter *conv;
905
906                 conv = conv_code_converter_new(src_codeset);
907                 parser = html_parser_new(tmpfp, conv);
908                 while ((str = html_parse(parser)) != NULL) {
909                         fputs(str, outfp);
910                 }
911                 html_parser_destroy(parser);
912                 conv_code_converter_destroy(conv);
913         } else if (mimeinfo->mime_type == MIME_TEXT_ENRICHED) {
914                 ERTFParser *parser;
915                 CodeConverter *conv;
916
917                 conv = conv_code_converter_new(src_codeset);
918                 parser = ertf_parser_new(tmpfp, conv);
919                 while ((str = ertf_parse(parser)) != NULL) {
920                         fputs(str, outfp);
921                 }
922                 ertf_parser_destroy(parser);
923                 conv_code_converter_destroy(conv);
924         }
925
926         if (conv_fail)
927                 g_warning(_("procmime_get_text_content(): Code conversion failed.\n"));
928
929         fclose(tmpfp);
930         rewind(outfp);
931
932         return outfp;
933 }
934
935 /* search the first text part of (multipart) MIME message,
936    decode, convert it and output to outfp. */
937 FILE *procmime_get_first_text_content(MsgInfo *msginfo)
938 {
939         FILE *infp, *outfp = NULL;
940         MimeInfo *mimeinfo, *partinfo;
941
942         g_return_val_if_fail(msginfo != NULL, NULL);
943
944         mimeinfo = procmime_scan_message(msginfo);
945         if (!mimeinfo) return NULL;
946
947         if ((infp = procmsg_open_message(msginfo)) == NULL) {
948                 procmime_mimeinfo_free_all(mimeinfo);
949                 return NULL;
950         }
951
952         partinfo = mimeinfo;
953         while (partinfo && partinfo->mime_type != MIME_TEXT)
954                 partinfo = procmime_mimeinfo_next(partinfo);
955         if (!partinfo) {
956                 partinfo = mimeinfo;
957                 while (partinfo && partinfo->mime_type != MIME_TEXT_HTML &&
958                                 partinfo->mime_type != MIME_TEXT_ENRICHED)
959                         partinfo = procmime_mimeinfo_next(partinfo);
960         }
961         
962
963         if (partinfo)
964                 outfp = procmime_get_text_content(partinfo, infp);
965
966         fclose(infp);
967         procmime_mimeinfo_free_all(mimeinfo);
968
969         return outfp;
970 }
971
972 gboolean procmime_find_string_part(MimeInfo *mimeinfo, const gchar *filename,
973                                    const gchar *str, gboolean case_sens)
974 {
975
976         FILE *infp, *outfp;
977         gchar buf[BUFFSIZE];
978         gchar *(* StrFindFunc) (const gchar *haystack, const gchar *needle);
979
980         g_return_val_if_fail(mimeinfo != NULL, FALSE);
981         g_return_val_if_fail(mimeinfo->mime_type == MIME_TEXT ||
982                              mimeinfo->mime_type == MIME_TEXT_HTML ||
983                              mimeinfo->mime_type == MIME_TEXT_ENRICHED, FALSE);
984         g_return_val_if_fail(str != NULL, FALSE);
985
986         if ((infp = fopen(filename, "rb")) == NULL) {
987                 FILE_OP_ERROR(filename, "fopen");
988                 return FALSE;
989         }
990
991         outfp = procmime_get_text_content(mimeinfo, infp);
992         fclose(infp);
993
994         if (!outfp)
995                 return FALSE;
996
997         if (case_sens)
998                 StrFindFunc = strstr;
999         else
1000                 StrFindFunc = strcasestr;
1001
1002         while (fgets(buf, sizeof(buf), outfp) != NULL) {
1003                 if (StrFindFunc(buf, str) != NULL) {
1004                         fclose(outfp);
1005                         return TRUE;
1006                 }
1007         }
1008
1009         fclose(outfp);
1010
1011         return FALSE;
1012 }
1013
1014 gboolean procmime_find_string(MsgInfo *msginfo, const gchar *str,
1015                               gboolean case_sens)
1016 {
1017         MimeInfo *mimeinfo;
1018         MimeInfo *partinfo;
1019         gchar *filename;
1020         gboolean found = FALSE;
1021
1022         g_return_val_if_fail(msginfo != NULL, FALSE);
1023         g_return_val_if_fail(str != NULL, FALSE);
1024
1025         filename = procmsg_get_message_file(msginfo);
1026         if (!filename) return FALSE;
1027         mimeinfo = procmime_scan_message(msginfo);
1028
1029         for (partinfo = mimeinfo; partinfo != NULL;
1030              partinfo = procmime_mimeinfo_next(partinfo)) {
1031                 if (partinfo->mime_type == MIME_TEXT ||
1032                     partinfo->mime_type == MIME_TEXT_HTML ||
1033                     partinfo->mime_type == MIME_TEXT_ENRICHED) {
1034                         if (procmime_find_string_part
1035                                 (partinfo, filename, str, case_sens) == TRUE) {
1036                                 found = TRUE;
1037                                 break;
1038                         }
1039                 }
1040         }
1041
1042         procmime_mimeinfo_free_all(mimeinfo);
1043         g_free(filename);
1044
1045         return found;
1046 }
1047
1048 gchar *procmime_get_tmp_file_name(MimeInfo *mimeinfo)
1049 {
1050         static guint32 id = 0;
1051         gchar *base;
1052         gchar *filename;
1053         gchar f_prefix[10];
1054
1055         g_return_val_if_fail(mimeinfo != NULL, NULL);
1056
1057         g_snprintf(f_prefix, sizeof(f_prefix), "%08x.", id++);
1058
1059         if (MIME_TEXT_HTML == mimeinfo->mime_type)
1060                 base = "mimetmp.html";
1061         else {
1062                 base = mimeinfo->filename ? mimeinfo->filename
1063                         : mimeinfo->name ? mimeinfo->name : "mimetmp";
1064                 base = g_basename(base);
1065                 if (*base == '\0') base = "mimetmp";
1066                 Xstrdup_a(base, base, return NULL);
1067                 subst_for_filename(base);
1068         }
1069
1070         filename = g_strconcat(get_mime_tmp_dir(), G_DIR_SEPARATOR_S,
1071                                f_prefix, base, NULL);
1072
1073         return filename;
1074 }
1075
1076 ContentType procmime_scan_mime_type(const gchar *mime_type)
1077 {
1078         ContentType type;
1079
1080         if (!strncasecmp(mime_type, "text/html", 9))
1081                 type = MIME_TEXT_HTML;
1082         else if (!strncasecmp(mime_type, "text/enriched", 13))
1083                 type = MIME_TEXT_ENRICHED;
1084         else if (!strncasecmp(mime_type, "text/", 5))
1085                 type = MIME_TEXT;
1086         else if (!strncasecmp(mime_type, "message/rfc822", 14))
1087                 type = MIME_MESSAGE_RFC822;
1088         else if (!strncasecmp(mime_type, "message/", 8))
1089                 type = MIME_TEXT;
1090         else if (!strncasecmp(mime_type, "application/octet-stream", 24))
1091                 type = MIME_APPLICATION_OCTET_STREAM;
1092         else if (!strncasecmp(mime_type, "application/", 12))
1093                 type = MIME_APPLICATION;
1094         else if (!strncasecmp(mime_type, "multipart/", 10))
1095                 type = MIME_MULTIPART;
1096         else if (!strncasecmp(mime_type, "image/", 6))
1097                 type = MIME_IMAGE;
1098         else if (!strncasecmp(mime_type, "audio/", 6))
1099                 type = MIME_AUDIO;
1100         else if (!strcasecmp(mime_type, "text"))
1101                 type = MIME_TEXT;
1102         else
1103                 type = MIME_UNKNOWN;
1104
1105         return type;
1106 }
1107
1108 static GList *mime_type_list = NULL;
1109
1110 gchar *procmime_get_mime_type(const gchar *filename)
1111 {
1112         static GHashTable *mime_type_table = NULL;
1113         MimeType *mime_type;
1114         const gchar *p;
1115         gchar *ext;
1116
1117         if (!mime_type_table) {
1118                 mime_type_table = procmime_get_mime_type_table();
1119                 if (!mime_type_table) return NULL;
1120         }
1121
1122         filename = g_basename(filename);
1123         p = strrchr(filename, '.');
1124         if (!p) return NULL;
1125
1126         Xstrdup_a(ext, p + 1, return NULL);
1127         g_strdown(ext);
1128         mime_type = g_hash_table_lookup(mime_type_table, ext);
1129         if (mime_type) {
1130                 gchar *str;
1131
1132                 str = g_strconcat(mime_type->type, "/", mime_type->sub_type,
1133                                   NULL);
1134                 return str;
1135         }
1136
1137         return NULL;
1138 }
1139
1140 static guint procmime_str_hash(gconstpointer gptr)
1141 {
1142         guint hash_result = 0;
1143         const char *str;
1144
1145         for (str = gptr; str && *str; str++) {
1146                 if (isupper(*str)) hash_result += (*str + ' ');
1147                 else hash_result += *str;
1148         }
1149
1150         return hash_result;
1151 }
1152
1153 static gint procmime_str_equal(gconstpointer gptr1, gconstpointer gptr2)
1154 {
1155         const char *str1 = gptr1;
1156         const char *str2 = gptr2;
1157
1158         return !strcasecmp(str1, str2);
1159 }
1160
1161 static GHashTable *procmime_get_mime_type_table(void)
1162 {
1163         GHashTable *table = NULL;
1164         GList *cur;
1165         MimeType *mime_type;
1166         gchar **exts;
1167
1168         if (!mime_type_list) {
1169                 mime_type_list = procmime_get_mime_type_list();
1170                 if (!mime_type_list) return NULL;
1171         }
1172
1173         table = g_hash_table_new(procmime_str_hash, procmime_str_equal);
1174
1175         for (cur = mime_type_list; cur != NULL; cur = cur->next) {
1176                 gint i;
1177                 gchar *key;
1178
1179                 mime_type = (MimeType *)cur->data;
1180
1181                 if (!mime_type->extension) continue;
1182
1183                 exts = g_strsplit(mime_type->extension, " ", 16);
1184                 for (i = 0; exts[i] != NULL; i++) {
1185                         /* make the key case insensitive */
1186                         g_strdown(exts[i]);
1187                         /* use previously dup'd key on overwriting */
1188                         if (g_hash_table_lookup(table, exts[i]))
1189                                 key = exts[i];
1190                         else
1191                                 key = g_strdup(exts[i]);
1192                         g_hash_table_insert(table, key, mime_type);
1193                 }
1194                 g_strfreev(exts);
1195         }
1196
1197         return table;
1198 }
1199
1200 GList *procmime_get_mime_type_list(void)
1201 {
1202         GList *list = NULL;
1203         FILE *fp;
1204         gchar buf[BUFFSIZE];
1205         gchar *p, *delim;
1206         MimeType *mime_type;
1207
1208         if (mime_type_list) 
1209                 return mime_type_list;
1210
1211         if ((fp = fopen("/etc/mime.types", "rb")) == NULL) {
1212                 if ((fp = fopen(SYSCONFDIR "/mime.types", "rb")) == NULL) {
1213                         FILE_OP_ERROR(SYSCONFDIR "/mime.types", "fopen");
1214                         return NULL;
1215                 }
1216         }
1217
1218         while (fgets(buf, sizeof(buf), fp) != NULL) {
1219                 p = strchr(buf, '#');
1220                 if (p) *p = '\0';
1221                 g_strstrip(buf);
1222
1223                 p = buf;
1224                 while (*p && !isspace(*p)) p++;
1225                 if (*p) {
1226                         *p = '\0';
1227                         p++;
1228                 }
1229                 delim = strchr(buf, '/');
1230                 if (delim == NULL) continue;
1231                 *delim = '\0';
1232
1233                 mime_type = g_new(MimeType, 1);
1234                 mime_type->type = g_strdup(buf);
1235                 mime_type->sub_type = g_strdup(delim + 1);
1236
1237                 while (*p && isspace(*p)) p++;
1238                 if (*p)
1239                         mime_type->extension = g_strdup(p);
1240                 else
1241                         mime_type->extension = NULL;
1242
1243                 list = g_list_append(list, mime_type);
1244         }
1245
1246         fclose(fp);
1247
1248         if (!list)
1249                 g_warning("Can't read mime.types\n");
1250
1251         return list;
1252 }
1253
1254 EncodingType procmime_get_encoding_for_charset(const gchar *charset)
1255 {
1256         if (!charset)
1257                 return ENC_8BIT;
1258         else if (!strncasecmp(charset, "ISO-2022-", 9) ||
1259                  !strcasecmp(charset, "US-ASCII"))
1260                 return ENC_7BIT;
1261         else
1262                 return ENC_8BIT;
1263                 /* return ENC_BASE64; */
1264                 /* return ENC_QUOTED_PRINTABLE; */
1265 }
1266
1267 EncodingType procmime_get_encoding_for_file(const gchar *file)
1268 {
1269         FILE *fp;
1270         guchar buf[BUFSIZ];
1271         size_t len;
1272
1273         if ((fp = fopen(file, "rb")) == NULL) {
1274                 FILE_OP_ERROR(file, "fopen");
1275                 return ENC_UNKNOWN;
1276         }
1277
1278         while ((len = fread(buf, sizeof(gchar), sizeof(buf), fp)) > 0) {
1279                 guchar *p;
1280                 gint i;
1281
1282                 for (p = buf, i = 0; i < len; p++, i++) {
1283                         if (*p & 0x80) {
1284                                 fclose(fp);
1285                                 return ENC_BASE64;
1286                         }
1287                 }
1288         }
1289
1290         fclose(fp);
1291         return ENC_7BIT;
1292 }
1293
1294 struct EncodingTable 
1295 {
1296         gchar *str;
1297         EncodingType enc_type;
1298 };
1299
1300 struct EncodingTable encoding_table[] = {
1301         {"7bit", ENC_7BIT},
1302         {"8bit", ENC_8BIT},
1303         {"binary", ENC_BINARY},
1304         {"quoted-printable", ENC_QUOTED_PRINTABLE},
1305         {"base64", ENC_BASE64},
1306         {"x-uuencode", ENC_UNKNOWN},
1307         {NULL, ENC_UNKNOWN},
1308 };
1309
1310 const gchar *procmime_get_encoding_str(EncodingType encoding)
1311 {
1312         struct EncodingTable *enc_table;
1313         
1314         for (enc_table = encoding_table; enc_table->str != NULL; enc_table++) {
1315                 if (enc_table->enc_type == encoding)
1316                         return enc_table->str;
1317         }
1318         return NULL;
1319 }