src/procmime.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2001 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 "codeconv.h"
  39 #include "utils.h"
  40 #include "prefs_common.h"
  41
  42 #if USE_GPGME
  43 #  include "rfc2015.h"
  44 #endif
  45
  46 static GHashTable *procmime_get_mime_type_table (void);
  47
  48 MimeInfo *procmime_mimeinfo_new(void)
  49 {
  50         MimeInfo *mimeinfo;
  51
  52         mimeinfo = g_new0(MimeInfo, 1);
  53         mimeinfo->mime_type     = MIME_UNKNOWN;
  54         mimeinfo->encoding_type = ENC_UNKNOWN;
  55
  56         return mimeinfo;
  57 }
  58
  59 void procmime_mimeinfo_free(MimeInfo *mimeinfo)
  60 {
  61         if (!mimeinfo) return;
  62
  63         g_free(mimeinfo->encoding);
  64         g_free(mimeinfo->content_type);
  65         g_free(mimeinfo->charset);
  66         g_free(mimeinfo->name);
  67         g_free(mimeinfo->boundary);
  68         g_free(mimeinfo->content_disposition);
  69         g_free(mimeinfo->filename);
  70 #if USE_GPGME
  71         g_free(mimeinfo->plaintextfile);
  72         g_free(mimeinfo->sigstatus);
  73         g_free(mimeinfo->sigstatus_full);
  74 #endif
  75
  76         procmime_mimeinfo_free(mimeinfo->sub);
  77
  78         g_free(mimeinfo);
  79 }
  80
  81 void procmime_mimeinfo_free_all(MimeInfo *mimeinfo)
  82 {
  83         while (mimeinfo != NULL) {
  84                 MimeInfo *next;
  85
  86                 g_free(mimeinfo->encoding);
  87                 g_free(mimeinfo->content_type);
  88                 g_free(mimeinfo->charset);
  89                 g_free(mimeinfo->name);
  90                 g_free(mimeinfo->boundary);
  91                 g_free(mimeinfo->content_disposition);
  92                 g_free(mimeinfo->filename);
  93 #if USE_GPGME
  94                 g_free(mimeinfo->plaintextfile);
  95                 g_free(mimeinfo->sigstatus);
  96                 g_free(mimeinfo->sigstatus_full);
  97 #endif
  98
  99                 procmime_mimeinfo_free_all(mimeinfo->sub);
 100                 procmime_mimeinfo_free_all(mimeinfo->children);
 101 #if USE_GPGME
 102                 procmime_mimeinfo_free_all(mimeinfo->plaintext);
 103 #endif
 104
 105                 next = mimeinfo->next;
 106                 g_free(mimeinfo);
 107                 mimeinfo = next;
 108         }
 109 }
 110
 111 MimeInfo *procmime_mimeinfo_insert(MimeInfo *parent, MimeInfo *mimeinfo)
 112 {
 113         MimeInfo *child = parent->children;
 114
 115         if (!child)
 116                 parent->children = mimeinfo;
 117         else {
 118                 while (child->next != NULL)
 119                         child = child->next;
 120
 121                 child->next = mimeinfo;
 122         }
 123
 124         mimeinfo->parent = parent;
 125         mimeinfo->level = parent->level + 1;
 126
 127         return mimeinfo;
 128 }
 129
 130 void procmime_mimeinfo_replace(MimeInfo *old, MimeInfo *new)
 131 {
 132         MimeInfo *parent = old->parent;
 133         MimeInfo *child;
 134
 135         if (!parent) {
 136                 g_warning("oops: Not top message");
 137                 return;
 138         }
 139         if (new->next) {
 140                 g_message("oops: new child should not have a sibling");
 141                 return;
 142         }
 143
 144         for (child = parent->children; child && child != old;
 145              child = child->next)
 146                 ;
 147         if (!child) {
 148                 g_warning("oops: parent can't find it's own child");
 149                 return;
 150         }
 151         procmime_mimeinfo_free_all(old);
 152
 153         if (child == parent->children) {
 154                 new->next = parent->children->next;
 155                 parent->children = new;
 156         } else {
 157                 new->next = child->next;
 158                 child = new;
 159         }
 160 }
 161
 162 MimeInfo *procmime_scan_message(MsgInfo *msginfo)
 163 {
 164         FILE *fp;
 165         MimeInfo *mimeinfo;
 166
 167         g_return_val_if_fail(msginfo != NULL, NULL);
 168
 169         if ((fp = procmsg_open_message(msginfo)) == NULL) return NULL;
 170         mimeinfo = procmime_scan_mime_header(fp);
 171
 172         if (mimeinfo) {
 173                 if (mimeinfo->mime_type != MIME_MULTIPART) {
 174                         if (fseek(fp, mimeinfo->fpos, SEEK_SET) < 0)
 175                                 perror("fseek");
 176                 }
 177                 if (mimeinfo->mime_type != MIME_TEXT)
 178                         procmime_scan_multipart_message(mimeinfo, fp);
 179         }
 180
 181 #if USE_GPGME
 182         if (prefs_common.auto_check_signatures)
 183                 rfc2015_check_signature(mimeinfo, fp);
 184 #endif
 185         fclose(fp);
 186
 187         return mimeinfo;
 188 }
 189
 190 void procmime_scan_multipart_message(MimeInfo *mimeinfo, FILE *fp)
 191 {
 192         gchar *p;
 193         gchar *boundary;
 194         gint boundary_len = 0;
 195         gchar buf[BUFFSIZE];
 196         glong fpos, prev_fpos;
 197         gint npart;
 198
 199         g_return_if_fail(mimeinfo != NULL);
 200         g_return_if_fail(mimeinfo->mime_type != MIME_TEXT);
 201
 202         if (mimeinfo->mime_type == MIME_MULTIPART) {
 203                 g_return_if_fail(mimeinfo->boundary != NULL);
 204                 g_return_if_fail(mimeinfo->sub == NULL);
 205         }
 206         g_return_if_fail(fp != NULL);
 207
 208         boundary = mimeinfo->boundary;
 209
 210         if (boundary) {
 211                 boundary_len = strlen(boundary);
 212
 213                 /* look for first boundary */
 214                 while ((p = fgets(buf, sizeof(buf), fp)) != NULL)
 215                         if (IS_BOUNDARY(buf, boundary, boundary_len)) break;
 216                 if (!p) return;
 217         }
 218
 219         if ((fpos = ftell(fp)) < 0) {
 220                 perror("ftell");
 221                 return;
 222         }
 223
 224         for (npart = 0;; npart++) {
 225                 MimeInfo *partinfo;
 226                 gboolean eom = FALSE;
 227
 228                 prev_fpos = fpos;
 229
 230                 partinfo = procmime_scan_mime_header(fp);
 231                 if (!partinfo) break;
 232                 procmime_mimeinfo_insert(mimeinfo, partinfo);
 233
 234                 if (partinfo->mime_type == MIME_MULTIPART) {
 235                         if (partinfo->level < 8)
 236                                 procmime_scan_multipart_message(partinfo, fp);
 237                 } else if (partinfo->mime_type == MIME_MESSAGE_RFC822) {
 238                         MimeInfo *sub;
 239
 240                         partinfo->sub = sub = procmime_scan_mime_header(fp);
 241                         if (!sub) break;
 242                         sub->level = partinfo->level + 1;
 243                         sub->parent = partinfo->parent;
 244                         sub->main = partinfo;
 245
 246                         if (sub->mime_type == MIME_MULTIPART) {
 247                                 if (sub->level < 8)
 248                                         procmime_scan_multipart_message
 249                                                 (sub, fp);
 250                         }
 251                 }
 252
 253                 /* look for next boundary */
 254                 buf[0] = '\0';
 255                 while ((p = fgets(buf, sizeof(buf), fp)) != NULL) {
 256                         if (IS_BOUNDARY(buf, boundary, boundary_len)) {
 257                                 if (buf[2 + boundary_len]     == '-' &&
 258                                     buf[2 + boundary_len + 1] == '-')
 259                                         eom = TRUE;
 260                                 break;
 261                         }
 262                 }
 263                 if (p == NULL)
 264                         eom = TRUE;     /* broken MIME message */
 265                 fpos = ftell(fp);
 266
 267                 partinfo->size = fpos - prev_fpos - strlen(buf);
 268
 269                 if (eom) break;
 270         }
 271         /*g_message ("** at " __PRETTY_FUNCTION__ ":%d:", __LINE__);*/
 272 }
 273
 274 void procmime_scan_encoding(MimeInfo *mimeinfo, const gchar *encoding)
 275 {
 276         gchar *buf;
 277
 278         Xstrdup_a(buf, encoding, return);
 279
 280         g_free(mimeinfo->encoding);
 281
 282         mimeinfo->encoding = g_strdup(g_strstrip(buf));
 283         if (!strcasecmp(buf, "7bit"))
 284                 mimeinfo->encoding_type = ENC_7BIT;
 285         else if (!strcasecmp(buf, "8bit"))
 286                 mimeinfo->encoding_type = ENC_8BIT;
 287         else if (!strcasecmp(buf, "quoted-printable"))
 288                 mimeinfo->encoding_type = ENC_QUOTED_PRINTABLE;
 289         else if (!strcasecmp(buf, "base64"))
 290                 mimeinfo->encoding_type = ENC_BASE64;
 291         else if (!strcasecmp(buf, "x-uuencode"))
 292                 mimeinfo->encoding_type = ENC_X_UUENCODE;
 293         else
 294                 mimeinfo->encoding_type = ENC_UNKNOWN;
 295
 296 }
 297
 298 void procmime_scan_content_type(MimeInfo *mimeinfo, const gchar *content_type)
 299 {
 300         gchar *delim, *p, *cnttype;
 301         gchar *buf;
 302
 303         if (conv_get_current_charset() == C_EUC_JP &&
 304             strchr(content_type, '\007')) {
 305                 gint len;
 306                 len = strlen(content_type) * 2 + 1;
 307                 Xalloca(buf, len, return);
 308                 conv_jistoeuc(buf, len, content_type);
 309         } else
 310                 Xstrdup_a(buf, content_type, return);
 311
 312         g_free(mimeinfo->content_type);
 313         g_free(mimeinfo->charset);
 314         g_free(mimeinfo->name);
 315         mimeinfo->content_type = NULL;
 316         mimeinfo->charset      = NULL;
 317         mimeinfo->name         = NULL;
 318
 319         if ((delim = strchr(buf, ';'))) *delim = '\0';
 320         mimeinfo->content_type = cnttype = g_strdup(g_strstrip(buf));
 321
 322         if (!strncasecmp(cnttype, "text/html", 9))
 323                 mimeinfo->mime_type = MIME_TEXT_HTML;
 324         else if (!strncasecmp(cnttype, "text/", 5))
 325                 mimeinfo->mime_type = MIME_TEXT;
 326         else if (!strncasecmp(cnttype, "message/rfc822", 14))
 327                 mimeinfo->mime_type = MIME_MESSAGE_RFC822;
 328         else if (!strncasecmp(cnttype, "message/", 8))
 329                 mimeinfo->mime_type = MIME_TEXT;
 330         else if (!strncasecmp(cnttype, "application/octet-stream", 24))
 331                 mimeinfo->mime_type = MIME_APPLICATION_OCTET_STREAM;
 332         else if (!strncasecmp(cnttype, "application/", 12))
 333                 mimeinfo->mime_type = MIME_APPLICATION;
 334         else if (!strncasecmp(cnttype, "multipart/", 10))
 335                 mimeinfo->mime_type = MIME_MULTIPART;
 336         else if (!strncasecmp(cnttype, "image/", 6))
 337                 mimeinfo->mime_type = MIME_IMAGE;
 338         else if (!strncasecmp(cnttype, "audio/", 6))
 339                 mimeinfo->mime_type = MIME_AUDIO;
 340         else if (!strcasecmp(cnttype, "text"))
 341                 mimeinfo->mime_type = MIME_TEXT;
 342         else
 343                 mimeinfo->mime_type = MIME_UNKNOWN;
 344
 345         if (!delim) return;
 346         p = delim + 1;
 347
 348         for (;;) {
 349                 gchar *eq;
 350                 gchar *attr, *value;
 351
 352                 if ((delim = strchr(p, ';'))) *delim = '\0';
 353
 354                 if (!(eq = strchr(p, '='))) break;
 355
 356                 *eq = '\0';
 357                 attr = p;
 358                 g_strstrip(attr);
 359                 value = eq + 1;
 360                 g_strstrip(value);
 361
 362                 if (*value == '"')
 363                         extract_quote(value, '"');
 364                 else {
 365                         eliminate_parenthesis(value, '(', ')');
 366                         g_strstrip(value);
 367                 }
 368
 369                 if (*value) {
 370                         if (!strcasecmp(attr, "charset"))
 371                                 mimeinfo->charset = g_strdup(value);
 372                         else if (!strcasecmp(attr, "name")) {
 373                                 gchar *tmp;
 374                                 size_t len;
 375
 376                                 len = strlen(value) + 1;
 377                                 Xalloca(tmp, len, return);
 378                                 conv_unmime_header(tmp, len, value, NULL);
 379                                 mimeinfo->name = g_strdup(tmp);
 380                         } else if (!strcasecmp(attr, "boundary"))
 381                                 mimeinfo->boundary = g_strdup(value);
 382                 }
 383
 384                 if (!delim) break;
 385                 p = delim + 1;
 386         }
 387
 388         if (mimeinfo->mime_type == MIME_MULTIPART && !mimeinfo->boundary)
 389                 mimeinfo->mime_type = MIME_TEXT;
 390 }
 391
 392 void procmime_scan_content_disposition(MimeInfo *mimeinfo,
 393                                        const gchar *content_disposition)
 394 {
 395         gchar *delim, *p, *dispos;
 396         gchar *buf;
 397
 398         if (conv_get_current_charset() == C_EUC_JP &&
 399             strchr(content_disposition, '\007')) {
 400                 gint len;
 401                 len = strlen(content_disposition) * 2 + 1;
 402                 Xalloca(buf, len, return);
 403                 conv_jistoeuc(buf, len, content_disposition);
 404         } else
 405                 Xstrdup_a(buf, content_disposition, return);
 406
 407         if ((delim = strchr(buf, ';'))) *delim = '\0';
 408         mimeinfo->content_disposition = dispos = g_strdup(g_strstrip(buf));
 409
 410         if (!delim) return;
 411         p = delim + 1;
 412
 413         for (;;) {
 414                 gchar *eq;
 415                 gchar *attr, *value;
 416
 417                 if ((delim = strchr(p, ';'))) *delim = '\0';
 418
 419                 if (!(eq = strchr(p, '='))) break;
 420
 421                 *eq = '\0';
 422                 attr = p;
 423                 g_strstrip(attr);
 424                 value = eq + 1;
 425                 g_strstrip(value);
 426
 427                 if (*value == '"')
 428                         extract_quote(value, '"');
 429                 else {
 430                         eliminate_parenthesis(value, '(', ')');
 431                         g_strstrip(value);
 432                 }
 433
 434                 if (*value) {
 435                         if (!strcasecmp(attr, "filename")) {
 436                                 gchar *tmp;
 437                                 size_t len;
 438
 439                                 len = strlen(value) + 1;
 440                                 Xalloca(tmp, len, return);
 441                                 conv_unmime_header(tmp, len, value, NULL);
 442                                 g_free(mimeinfo->filename);
 443                                 mimeinfo->filename = g_strdup(tmp);
 444                                 break;
 445                         }
 446                 }
 447
 448                 if (!delim) break;
 449                 p = delim + 1;
 450         }
 451 }
 452
 453 enum
 454 {
 455         H_CONTENT_TRANSFER_ENCODING = 0,
 456         H_CONTENT_TYPE              = 1,
 457         H_CONTENT_DISPOSITION       = 2
 458 };
 459
 460 MimeInfo *procmime_scan_mime_header(FILE *fp)
 461 {
 462         static HeaderEntry hentry[] = {{"Content-Transfer-Encoding:",
 463                                                           NULL, FALSE},
 464                                        {"Content-Type:", NULL, TRUE},
 465                                        {"Content-Disposition:",
 466                                                           NULL, TRUE},
 467                                        {NULL,             NULL, FALSE}};
 468         gchar buf[BUFFSIZE];
 469         gint hnum;
 470         HeaderEntry *hp;
 471         MimeInfo *mimeinfo;
 472
 473         g_return_val_if_fail(fp != NULL, NULL);
 474
 475         mimeinfo = procmime_mimeinfo_new();
 476         mimeinfo->mime_type = MIME_TEXT;
 477         mimeinfo->encoding_type = ENC_7BIT;
 478         mimeinfo->fpos = ftell(fp);
 479
 480         while ((hnum = procheader_get_one_field(buf, sizeof(buf), fp, hentry))
 481                != -1) {
 482                 hp = hentry + hnum;
 483
 484                 if (H_CONTENT_TRANSFER_ENCODING == hnum) {
 485                         procmime_scan_encoding
 486                                 (mimeinfo, buf + strlen(hp->name));
 487                 } else if (H_CONTENT_TYPE == hnum) {
 488                         procmime_scan_content_type
 489                                 (mimeinfo, buf + strlen(hp->name));
 490                 } else if (H_CONTENT_DISPOSITION == hnum) {
 491                         procmime_scan_content_disposition
 492                                 (mimeinfo, buf + strlen(hp->name));
 493                 }
 494         }
 495
 496         if (!mimeinfo->content_type)
 497                 mimeinfo->content_type = g_strdup("text/plain");
 498
 499         return mimeinfo;
 500 }
 501
 502 FILE *procmime_decode_content(FILE *outfp, FILE *infp, MimeInfo *mimeinfo)
 503 {
 504         gchar buf[BUFFSIZE];
 505         gchar *boundary = NULL;
 506         gint boundary_len = 0;
 507         gboolean tmp_file = FALSE;
 508
 509         g_return_val_if_fail(infp != NULL, NULL);
 510         g_return_val_if_fail(mimeinfo != NULL, NULL);
 511
 512         if (!outfp) {
 513                 outfp = my_tmpfile();
 514                 if (!outfp) {
 515                         perror("tmpfile");
 516                         return NULL;
 517                 }
 518                 tmp_file = TRUE;
 519         }
 520
 521         if (mimeinfo->parent && mimeinfo->parent->boundary) {
 522                 boundary = mimeinfo->parent->boundary;
 523                 boundary_len = strlen(boundary);
 524         }
 525
 526         if (mimeinfo->encoding_type == ENC_QUOTED_PRINTABLE) {
 527                 gboolean softline = FALSE;
 528
 529                 while (fgets(buf, sizeof(buf), infp) != NULL &&
 530                        (!boundary ||
 531                         !IS_BOUNDARY(buf, boundary, boundary_len))) {
 532                         guchar *p = buf;
 533
 534                         softline = DoOneQPLine(&p, FALSE, softline);
 535                         fwrite(buf, p - (guchar *)buf, 1, outfp);
 536                 }
 537         } else if (mimeinfo->encoding_type == ENC_BASE64) {
 538                 gchar outbuf[BUFFSIZE];
 539                 gint len;
 540                 Base64Decoder *decoder;
 541
 542                 decoder = base64_decoder_new();
 543                 while (fgets(buf, sizeof(buf), infp) != NULL &&
 544                        (!boundary ||
 545                         !IS_BOUNDARY(buf, boundary, boundary_len))) {
 546                         len = base64_decoder_decode(decoder, buf, outbuf);
 547                         if (len < 0) {
 548                                 g_warning("Bad BASE64 content\n");
 549                                 break;
 550                         }
 551                         fwrite(outbuf, sizeof(gchar), len, outfp);
 552                 }
 553                 base64_decoder_free(decoder);
 554         } else if (mimeinfo->encoding_type == ENC_X_UUENCODE) {
 555                 gchar outbuf[BUFFSIZE];
 556                 gint len;
 557                 gboolean flag = FALSE;
 558
 559                 while (fgets(buf, sizeof(buf), infp) != NULL &&
 560                        (!boundary ||
 561                         !IS_BOUNDARY(buf, boundary, boundary_len))) {
 562                         if(!flag && strncmp(buf,"begin ", 6)) continue;
 563
 564                         if (flag) {
 565                                 len = fromuutobits(outbuf, buf);
 566                                 if (len <= 0) {
 567                                         if (len < 0)
 568                                                 g_warning("Bad UUENCODE content(%d)\n", len);
 569                                         break;
 570                                 }
 571                                 fwrite(outbuf, sizeof(gchar), len, outfp);
 572                         } else
 573                                 flag = TRUE;
 574                 }
 575         } else {
 576                 while (fgets(buf, sizeof(buf), infp) != NULL &&
 577                        (!boundary ||
 578                         !IS_BOUNDARY(buf, boundary, boundary_len))) {
 579                         fputs(buf, outfp);
 580                 }
 581         }
 582
 583         if (tmp_file) rewind(outfp);
 584         return outfp;
 585 }
 586
 587 gint procmime_get_part(const gchar *outfile, const gchar *infile,
 588                        MimeInfo *mimeinfo)
 589 {
 590         FILE *infp, *outfp;
 591         gchar buf[BUFFSIZE];
 592
 593         g_return_val_if_fail(outfile != NULL, -1);
 594         g_return_val_if_fail(infile != NULL, -1);
 595         g_return_val_if_fail(mimeinfo != NULL, -1);
 596
 597         if ((infp = fopen(infile, "r")) == NULL) {
 598                 FILE_OP_ERROR(infile, "fopen");
 599                 return -1;
 600         }
 601         if (fseek(infp, mimeinfo->fpos, SEEK_SET) < 0) {
 602                 FILE_OP_ERROR(infile, "fseek");
 603                 fclose(infp);
 604                 return -1;
 605         }
 606         if ((outfp = fopen(outfile, "w")) == NULL) {
 607                 FILE_OP_ERROR(outfile, "fopen");
 608                 fclose(infp);
 609                 return -1;
 610         }
 611
 612         while (fgets(buf, sizeof(buf), infp) != NULL)
 613                 if (buf[0] == '\r' || buf[0] == '\n') break;
 614
 615         procmime_decode_content(outfp, infp, mimeinfo);
 616
 617         fclose(infp);
 618         if (fclose(outfp) == EOF) {
 619                 FILE_OP_ERROR(outfile, "fclose");
 620                 unlink(outfile);
 621                 return -1;
 622         }
 623
 624         return 0;
 625 }
 626
 627 FILE *procmime_get_text_part(MsgInfo *msginfo)
 628 {
 629         FILE *infp, *tmpfp, *outfp;
 630         MimeInfo *mimeinfo, *partinfo = NULL;
 631         gchar *src_codeset;
 632         gboolean conv_fail = FALSE;
 633         gchar buf[BUFFSIZE];
 634
 635         g_return_val_if_fail(msginfo != NULL, NULL);
 636
 637         mimeinfo = procmime_scan_message(msginfo);
 638         if (!mimeinfo) return NULL;
 639
 640         if ((infp = procmsg_open_message(msginfo)) == NULL) {
 641                 procmime_mimeinfo_free_all(mimeinfo);
 642                 return NULL;
 643         }
 644
 645         if (mimeinfo->mime_type == MIME_MULTIPART) {
 646                 partinfo = mimeinfo->children;
 647                 if (partinfo && partinfo->mime_type == MIME_TEXT) {
 648                         if (fseek(infp, partinfo->fpos, SEEK_SET) < 0) {
 649                                 perror("fseek");
 650                                 partinfo = NULL;
 651                         }
 652                 } else
 653                         partinfo = NULL;
 654         } else if (mimeinfo->mime_type == MIME_TEXT) {
 655                 partinfo = mimeinfo;
 656                 if (fseek(infp, partinfo->fpos, SEEK_SET) < 0) {
 657                         perror("fseek");
 658                         partinfo = NULL;
 659                 }
 660         }
 661
 662         if (!partinfo) {
 663                 procmime_mimeinfo_free_all(mimeinfo);
 664                 return NULL;
 665         }
 666
 667         while (fgets(buf, sizeof(buf), infp) != NULL)
 668                 if (buf[0] == '\r' || buf[0] == '\n') break;
 669
 670         tmpfp = procmime_decode_content(NULL, infp, partinfo);
 671         if (!tmpfp) {
 672                 procmime_mimeinfo_free_all(mimeinfo);
 673                 return NULL;
 674         }
 675
 676         if ((outfp = my_tmpfile()) == NULL) {
 677                 perror("tmpfile");
 678                 fclose(tmpfp);
 679                 procmime_mimeinfo_free_all(mimeinfo);
 680                 return NULL;
 681         }
 682
 683         src_codeset = prefs_common.force_charset
 684                 ? prefs_common.force_charset : partinfo->charset;
 685
 686         while (fgets(buf, sizeof(buf), tmpfp) != NULL) {
 687                 gchar *str;
 688
 689                 str = conv_codeset_strdup(buf, src_codeset, NULL);
 690                 if (str) {
 691                         fputs(str, outfp);
 692                         g_free(str);
 693                 } else {
 694                         conv_fail = TRUE;
 695                         fputs(buf, outfp);
 696                 }
 697         }
 698         if (conv_fail) g_warning(_("Code conversion failed.\n"));
 699
 700         fclose(tmpfp);
 701         procmime_mimeinfo_free_all(mimeinfo);
 702         rewind(outfp);
 703
 704         return outfp;
 705 }
 706
 707 gchar *procmime_get_tmp_file_name(MimeInfo *mimeinfo)
 708 {
 709         static guint32 id = 0;
 710         gchar *base;
 711         gchar *filename;
 712         gchar f_prefix[10];
 713
 714         g_return_val_if_fail(mimeinfo != NULL, NULL);
 715
 716         g_snprintf(f_prefix, sizeof(f_prefix), "%08x.", id++);
 717
 718         if (MIME_TEXT_HTML == mimeinfo->mime_type)
 719                 base = "mimetmp.html";
 720         else {
 721                 base = mimeinfo->filename ? mimeinfo->filename
 722                         : mimeinfo->name ? mimeinfo->name : "mimetmp";
 723                 base = g_basename(base);
 724                 if (*base == '\0') base = "mimetmp";
 725         }
 726
 727         filename = g_strconcat(get_mime_tmp_dir(), G_DIR_SEPARATOR_S,
 728                                f_prefix, base, NULL);
 729
 730         return filename;
 731 }
 732
 733 static GList *mime_type_list = NULL;
 734
 735 gchar *procmime_get_mime_type(const gchar *filename)
 736 {
 737         static GHashTable *mime_type_table = NULL;
 738         MimeType *mime_type;
 739         const gchar *ext, *p;
 740
 741         if (!mime_type_table) {
 742                 mime_type_table = procmime_get_mime_type_table();
 743                 if (!mime_type_table) return NULL;
 744         }
 745
 746         filename = g_basename(filename);
 747         p = strrchr(filename, '.');
 748         if (p)
 749                 ext = p + 1;
 750         else
 751                 return NULL;
 752
 753         mime_type = g_hash_table_lookup(mime_type_table, ext);
 754         if (mime_type) {
 755                 gchar *str;
 756
 757                 str = g_strconcat(mime_type->type, "/", mime_type->sub_type,
 758                                   NULL);
 759                 return str;
 760         }
 761
 762         return NULL;
 763 }
 764
 765 static guint procmime_str_hash(gconstpointer gptr)
 766 {
 767         guint hash_result = 0;
 768         const char *str;
 769
 770         for (str = gptr; str && *str; str++) {
 771                 if (isupper(*str)) hash_result += (*str + ' ');
 772                 else hash_result += *str;
 773         }
 774
 775         return hash_result;
 776 }
 777
 778 static gint procmime_str_equal(gconstpointer gptr1, gconstpointer gptr2)
 779 {
 780         const char *str1 = gptr1;
 781         const char *str2 = gptr2;
 782
 783         return !strcasecmp(str1, str2);
 784 }
 785
 786 static GHashTable *procmime_get_mime_type_table(void)
 787 {
 788         GHashTable *table = NULL;
 789         GList *cur;
 790         MimeType *mime_type;
 791         gchar **exts;
 792
 793         if (!mime_type_list) {
 794                 mime_type_list = procmime_get_mime_type_list();
 795                 if (!mime_type_list) return NULL;
 796         }
 797
 798         table = g_hash_table_new(procmime_str_hash, procmime_str_equal);
 799
 800         for (cur = mime_type_list; cur != NULL; cur = cur->next) {
 801                 gint i;
 802
 803                 mime_type = (MimeType *)cur->data;
 804
 805                 if (!mime_type->extension) continue;
 806
 807                 exts = g_strsplit(mime_type->extension, " ", 16);
 808                 for (i = 0; exts[i] != NULL; i++)
 809                         g_hash_table_insert(table, g_strdup(exts[i]),
 810                                             mime_type);
 811                 g_strfreev(exts);
 812         }
 813
 814         return table;
 815 }
 816
 817 GList *procmime_get_mime_type_list(void)
 818 {
 819         GList *list = NULL;
 820         FILE *fp;
 821         gchar buf[BUFFSIZE];
 822         gchar *p, *delim;
 823         MimeType *mime_type;
 824
 825         if (mime_type_list)
 826                 return mime_type_list;
 827
 828         if ((fp = fopen(SYSCONFDIR "/mime.types", "r")) == NULL) {
 829                 FILE_OP_ERROR(SYSCONFDIR "/mime.types", "fopen");
 830                 return NULL;
 831         }
 832
 833         while (fgets(buf, sizeof(buf), fp) != NULL) {
 834                 p = strchr(buf, '#');
 835                 if (p) *p = '\0';
 836                 g_strstrip(buf);
 837
 838                 p = buf;
 839                 while (*p && !isspace(*p)) p++;
 840                 if (*p) {
 841                         *p = '\0';
 842                         p++;
 843                 }
 844                 delim = strchr(buf, '/');
 845                 if (delim == NULL) continue;
 846                 *delim = '\0';
 847
 848                 mime_type = g_new(MimeType, 1);
 849                 mime_type->type = g_strdup(buf);
 850                 mime_type->sub_type = g_strdup(delim + 1);
 851
 852                 while (*p && isspace(*p)) p++;
 853                 if (*p)
 854                         mime_type->extension = g_strdup(p);
 855                 else
 856                         mime_type->extension = NULL;
 857
 858                 list = g_list_append(list, mime_type);
 859         }
 860
 861         fclose(fp);
 862
 863         if (!list)
 864                 g_warning("Can't read mime.types\n");
 865
 866         return list;
 867 }
 868
 869 EncodingType procmime_get_encoding_for_charset(const gchar *charset)
 870 {
 871         if (!charset)
 872                 return ENC_8BIT;
 873         else if (!strncasecmp(charset, "ISO-2022-", 9) ||
 874                  !strcasecmp(charset, "US-ASCII"))
 875                 return ENC_7BIT;
 876         else
 877                 return ENC_8BIT;
 878                 /* return ENC_BASE64; */
 879                 /* return ENC_QUOTED_PRINTABLE; */
 880 }
 881
 882 const gchar *procmime_get_encoding_str(EncodingType encoding)
 883 {
 884         static const gchar *encoding_str[] = {
 885                 "7bit", "8bit", "quoted-printable", "base64", "x-uuencode",
 886                 NULL
 887         };
 888
 889         if (encoding >= ENC_7BIT && encoding <= ENC_UNKNOWN)
 890                 return encoding_str[encoding];
 891         else
 892                 return NULL;
 893 }