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, '\033')) {
 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         mimeinfo->mime_type = procmime_scan_mime_type(cnttype);
 323
 324         if (!delim) return;
 325         p = delim + 1;
 326
 327         for (;;) {
 328                 gchar *eq;
 329                 gchar *attr, *value;
 330
 331                 if ((delim = strchr(p, ';'))) *delim = '\0';
 332
 333                 if (!(eq = strchr(p, '='))) break;
 334
 335                 *eq = '\0';
 336                 attr = p;
 337                 g_strstrip(attr);
 338                 value = eq + 1;
 339                 g_strstrip(value);
 340
 341                 if (*value == '"')
 342                         extract_quote(value, '"');
 343                 else {
 344                         eliminate_parenthesis(value, '(', ')');
 345                         g_strstrip(value);
 346                 }
 347
 348                 if (*value) {
 349                         if (!strcasecmp(attr, "charset"))
 350                                 mimeinfo->charset = g_strdup(value);
 351                         else if (!strcasecmp(attr, "name")) {
 352                                 gchar *tmp;
 353                                 size_t len;
 354
 355                                 len = strlen(value) + 1;
 356                                 Xalloca(tmp, len, return);
 357                                 conv_unmime_header(tmp, len, value, NULL);
 358                                 mimeinfo->name = g_strdup(tmp);
 359                         } else if (!strcasecmp(attr, "boundary"))
 360                                 mimeinfo->boundary = g_strdup(value);
 361                 }
 362
 363                 if (!delim) break;
 364                 p = delim + 1;
 365         }
 366
 367         if (mimeinfo->mime_type == MIME_MULTIPART && !mimeinfo->boundary)
 368                 mimeinfo->mime_type = MIME_TEXT;
 369 }
 370
 371 void procmime_scan_content_disposition(MimeInfo *mimeinfo,
 372                                        const gchar *content_disposition)
 373 {
 374         gchar *delim, *p, *dispos;
 375         gchar *buf;
 376
 377         if (conv_get_current_charset() == C_EUC_JP &&
 378             strchr(content_disposition, '\033')) {
 379                 gint len;
 380                 len = strlen(content_disposition) * 2 + 1;
 381                 Xalloca(buf, len, return);
 382                 conv_jistoeuc(buf, len, content_disposition);
 383         } else
 384                 Xstrdup_a(buf, content_disposition, return);
 385
 386         if ((delim = strchr(buf, ';'))) *delim = '\0';
 387         mimeinfo->content_disposition = dispos = g_strdup(g_strstrip(buf));
 388
 389         if (!delim) return;
 390         p = delim + 1;
 391
 392         for (;;) {
 393                 gchar *eq;
 394                 gchar *attr, *value;
 395
 396                 if ((delim = strchr(p, ';'))) *delim = '\0';
 397
 398                 if (!(eq = strchr(p, '='))) break;
 399
 400                 *eq = '\0';
 401                 attr = p;
 402                 g_strstrip(attr);
 403                 value = eq + 1;
 404                 g_strstrip(value);
 405
 406                 if (*value == '"')
 407                         extract_quote(value, '"');
 408                 else {
 409                         eliminate_parenthesis(value, '(', ')');
 410                         g_strstrip(value);
 411                 }
 412
 413                 if (*value) {
 414                         if (!strcasecmp(attr, "filename")) {
 415                                 gchar *tmp;
 416                                 size_t len;
 417
 418                                 len = strlen(value) + 1;
 419                                 Xalloca(tmp, len, return);
 420                                 conv_unmime_header(tmp, len, value, NULL);
 421                                 g_free(mimeinfo->filename);
 422                                 mimeinfo->filename = g_strdup(tmp);
 423                                 break;
 424                         }
 425                 }
 426
 427                 if (!delim) break;
 428                 p = delim + 1;
 429         }
 430 }
 431
 432 enum
 433 {
 434         H_CONTENT_TRANSFER_ENCODING = 0,
 435         H_CONTENT_TYPE              = 1,
 436         H_CONTENT_DISPOSITION       = 2
 437 };
 438
 439 MimeInfo *procmime_scan_mime_header(FILE *fp)
 440 {
 441         static HeaderEntry hentry[] = {{"Content-Transfer-Encoding:",
 442                                                           NULL, FALSE},
 443                                        {"Content-Type:", NULL, TRUE},
 444                                        {"Content-Disposition:",
 445                                                           NULL, TRUE},
 446                                        {NULL,             NULL, FALSE}};
 447         gchar buf[BUFFSIZE];
 448         gint hnum;
 449         HeaderEntry *hp;
 450         MimeInfo *mimeinfo;
 451
 452         g_return_val_if_fail(fp != NULL, NULL);
 453
 454         mimeinfo = procmime_mimeinfo_new();
 455         mimeinfo->mime_type = MIME_TEXT;
 456         mimeinfo->encoding_type = ENC_7BIT;
 457         mimeinfo->fpos = ftell(fp);
 458
 459         while ((hnum = procheader_get_one_field(buf, sizeof(buf), fp, hentry))
 460                != -1) {
 461                 hp = hentry + hnum;
 462
 463                 if (H_CONTENT_TRANSFER_ENCODING == hnum) {
 464                         procmime_scan_encoding
 465                                 (mimeinfo, buf + strlen(hp->name));
 466                 } else if (H_CONTENT_TYPE == hnum) {
 467                         procmime_scan_content_type
 468                                 (mimeinfo, buf + strlen(hp->name));
 469                 } else if (H_CONTENT_DISPOSITION == hnum) {
 470                         procmime_scan_content_disposition
 471                                 (mimeinfo, buf + strlen(hp->name));
 472                 }
 473         }
 474
 475         if (mimeinfo->mime_type == MIME_APPLICATION_OCTET_STREAM &&
 476             mimeinfo->name) {
 477                 const gchar *type;
 478                 type = procmime_get_mime_type(mimeinfo->name);
 479                 if (type)
 480                         mimeinfo->mime_type = procmime_scan_mime_type(type);
 481         }
 482
 483         if (!mimeinfo->content_type)
 484                 mimeinfo->content_type = g_strdup("text/plain");
 485
 486         return mimeinfo;
 487 }
 488
 489 FILE *procmime_decode_content(FILE *outfp, FILE *infp, MimeInfo *mimeinfo)
 490 {
 491         gchar buf[BUFFSIZE];
 492         gchar *boundary = NULL;
 493         gint boundary_len = 0;
 494         gboolean tmp_file = FALSE;
 495
 496         g_return_val_if_fail(infp != NULL, NULL);
 497         g_return_val_if_fail(mimeinfo != NULL, NULL);
 498
 499         if (!outfp) {
 500                 outfp = my_tmpfile();
 501                 if (!outfp) {
 502                         perror("tmpfile");
 503                         return NULL;
 504                 }
 505                 tmp_file = TRUE;
 506         }
 507
 508         if (mimeinfo->parent && mimeinfo->parent->boundary) {
 509                 boundary = mimeinfo->parent->boundary;
 510                 boundary_len = strlen(boundary);
 511         }
 512
 513         if (mimeinfo->encoding_type == ENC_QUOTED_PRINTABLE) {
 514                 gboolean softline = FALSE;
 515
 516                 while (fgets(buf, sizeof(buf), infp) != NULL &&
 517                        (!boundary ||
 518                         !IS_BOUNDARY(buf, boundary, boundary_len))) {
 519                         guchar *p = buf;
 520
 521                         softline = DoOneQPLine(&p, FALSE, softline);
 522                         fwrite(buf, p - (guchar *)buf, 1, outfp);
 523                 }
 524         } else if (mimeinfo->encoding_type == ENC_BASE64) {
 525                 gchar outbuf[BUFFSIZE];
 526                 gint len;
 527                 Base64Decoder *decoder;
 528
 529                 decoder = base64_decoder_new();
 530                 while (fgets(buf, sizeof(buf), infp) != NULL &&
 531                        (!boundary ||
 532                         !IS_BOUNDARY(buf, boundary, boundary_len))) {
 533                         len = base64_decoder_decode(decoder, buf, outbuf);
 534                         if (len < 0) {
 535                                 g_warning("Bad BASE64 content\n");
 536                                 break;
 537                         }
 538                         fwrite(outbuf, sizeof(gchar), len, outfp);
 539                 }
 540                 base64_decoder_free(decoder);
 541         } else if (mimeinfo->encoding_type == ENC_X_UUENCODE) {
 542                 gchar outbuf[BUFFSIZE];
 543                 gint len;
 544                 gboolean flag = FALSE;
 545
 546                 while (fgets(buf, sizeof(buf), infp) != NULL &&
 547                        (!boundary ||
 548                         !IS_BOUNDARY(buf, boundary, boundary_len))) {
 549                         if(!flag && strncmp(buf,"begin ", 6)) continue;
 550
 551                         if (flag) {
 552                                 len = fromuutobits(outbuf, buf);
 553                                 if (len <= 0) {
 554                                         if (len < 0)
 555                                                 g_warning("Bad UUENCODE content(%d)\n", len);
 556                                         break;
 557                                 }
 558                                 fwrite(outbuf, sizeof(gchar), len, outfp);
 559                         } else
 560                                 flag = TRUE;
 561                 }
 562         } else {
 563                 while (fgets(buf, sizeof(buf), infp) != NULL &&
 564                        (!boundary ||
 565                         !IS_BOUNDARY(buf, boundary, boundary_len))) {
 566                         fputs(buf, outfp);
 567                 }
 568         }
 569
 570         if (tmp_file) rewind(outfp);
 571         return outfp;
 572 }
 573
 574 gint procmime_get_part(const gchar *outfile, const gchar *infile,
 575                        MimeInfo *mimeinfo)
 576 {
 577         FILE *infp, *outfp;
 578         gchar buf[BUFFSIZE];
 579
 580         g_return_val_if_fail(outfile != NULL, -1);
 581         g_return_val_if_fail(infile != NULL, -1);
 582         g_return_val_if_fail(mimeinfo != NULL, -1);
 583
 584         if ((infp = fopen(infile, "r")) == NULL) {
 585                 FILE_OP_ERROR(infile, "fopen");
 586                 return -1;
 587         }
 588         if (fseek(infp, mimeinfo->fpos, SEEK_SET) < 0) {
 589                 FILE_OP_ERROR(infile, "fseek");
 590                 fclose(infp);
 591                 return -1;
 592         }
 593         if ((outfp = fopen(outfile, "w")) == NULL) {
 594                 FILE_OP_ERROR(outfile, "fopen");
 595                 fclose(infp);
 596                 return -1;
 597         }
 598
 599         while (fgets(buf, sizeof(buf), infp) != NULL)
 600                 if (buf[0] == '\r' || buf[0] == '\n') break;
 601
 602         procmime_decode_content(outfp, infp, mimeinfo);
 603
 604         fclose(infp);
 605         if (fclose(outfp) == EOF) {
 606                 FILE_OP_ERROR(outfile, "fclose");
 607                 unlink(outfile);
 608                 return -1;
 609         }
 610
 611         return 0;
 612 }
 613
 614 FILE *procmime_get_text_part(MsgInfo *msginfo)
 615 {
 616         FILE *infp, *tmpfp, *outfp;
 617         MimeInfo *mimeinfo, *partinfo = NULL;
 618         gchar *src_codeset;
 619         gboolean conv_fail = FALSE;
 620         gchar buf[BUFFSIZE];
 621
 622         g_return_val_if_fail(msginfo != NULL, NULL);
 623
 624         mimeinfo = procmime_scan_message(msginfo);
 625         if (!mimeinfo) return NULL;
 626
 627         if ((infp = procmsg_open_message(msginfo)) == NULL) {
 628                 procmime_mimeinfo_free_all(mimeinfo);
 629                 return NULL;
 630         }
 631
 632         if (mimeinfo->mime_type == MIME_MULTIPART) {
 633                 partinfo = mimeinfo->children;
 634                 if (partinfo && partinfo->mime_type == MIME_TEXT) {
 635                         if (fseek(infp, partinfo->fpos, SEEK_SET) < 0) {
 636                                 perror("fseek");
 637                                 partinfo = NULL;
 638                         }
 639                 } else
 640                         partinfo = NULL;
 641         } else if (mimeinfo->mime_type == MIME_TEXT) {
 642                 partinfo = mimeinfo;
 643                 if (fseek(infp, partinfo->fpos, SEEK_SET) < 0) {
 644                         perror("fseek");
 645                         partinfo = NULL;
 646                 }
 647         }
 648
 649         if (!partinfo) {
 650                 procmime_mimeinfo_free_all(mimeinfo);
 651                 return NULL;
 652         }
 653
 654         while (fgets(buf, sizeof(buf), infp) != NULL)
 655                 if (buf[0] == '\r' || buf[0] == '\n') break;
 656
 657         tmpfp = procmime_decode_content(NULL, infp, partinfo);
 658         if (!tmpfp) {
 659                 procmime_mimeinfo_free_all(mimeinfo);
 660                 return NULL;
 661         }
 662
 663         if ((outfp = my_tmpfile()) == NULL) {
 664                 perror("tmpfile");
 665                 fclose(tmpfp);
 666                 procmime_mimeinfo_free_all(mimeinfo);
 667                 return NULL;
 668         }
 669
 670         src_codeset = prefs_common.force_charset
 671                 ? prefs_common.force_charset : partinfo->charset;
 672
 673         while (fgets(buf, sizeof(buf), tmpfp) != NULL) {
 674                 gchar *str;
 675
 676                 str = conv_codeset_strdup(buf, src_codeset, NULL);
 677                 if (str) {
 678                         fputs(str, outfp);
 679                         g_free(str);
 680                 } else {
 681                         conv_fail = TRUE;
 682                         fputs(buf, outfp);
 683                 }
 684         }
 685         if (conv_fail) g_warning(_("Code conversion failed.\n"));
 686
 687         fclose(tmpfp);
 688         procmime_mimeinfo_free_all(mimeinfo);
 689         rewind(outfp);
 690
 691         return outfp;
 692 }
 693
 694 gchar *procmime_get_tmp_file_name(MimeInfo *mimeinfo)
 695 {
 696         static guint32 id = 0;
 697         gchar *base;
 698         gchar *filename;
 699         gchar f_prefix[10];
 700
 701         g_return_val_if_fail(mimeinfo != NULL, NULL);
 702
 703         g_snprintf(f_prefix, sizeof(f_prefix), "%08x.", id++);
 704
 705         if (MIME_TEXT_HTML == mimeinfo->mime_type)
 706                 base = "mimetmp.html";
 707         else {
 708                 base = mimeinfo->filename ? mimeinfo->filename
 709                         : mimeinfo->name ? mimeinfo->name : "mimetmp";
 710                 base = g_basename(base);
 711                 if (*base == '\0') base = "mimetmp";
 712         }
 713
 714         filename = g_strconcat(get_mime_tmp_dir(), G_DIR_SEPARATOR_S,
 715                                f_prefix, base, NULL);
 716
 717         return filename;
 718 }
 719
 720 ContentType procmime_scan_mime_type(const gchar *mime_type)
 721 {
 722         ContentType type;
 723
 724         if (!strncasecmp(mime_type, "text/html", 9))
 725                 type = MIME_TEXT_HTML;
 726         else if (!strncasecmp(mime_type, "text/", 5))
 727                 type = MIME_TEXT;
 728         else if (!strncasecmp(mime_type, "message/rfc822", 14))
 729                 type = MIME_MESSAGE_RFC822;
 730         else if (!strncasecmp(mime_type, "message/", 8))
 731                 type = MIME_TEXT;
 732         else if (!strncasecmp(mime_type, "application/octet-stream", 24))
 733                 type = MIME_APPLICATION_OCTET_STREAM;
 734         else if (!strncasecmp(mime_type, "application/", 12))
 735                 type = MIME_APPLICATION;
 736         else if (!strncasecmp(mime_type, "multipart/", 10))
 737                 type = MIME_MULTIPART;
 738         else if (!strncasecmp(mime_type, "image/", 6))
 739                 type = MIME_IMAGE;
 740         else if (!strncasecmp(mime_type, "audio/", 6))
 741                 type = MIME_AUDIO;
 742         else if (!strcasecmp(mime_type, "text"))
 743                 type = MIME_TEXT;
 744         else
 745                 type = MIME_UNKNOWN;
 746
 747         return type;
 748 }
 749
 750 static GList *mime_type_list = NULL;
 751
 752 gchar *procmime_get_mime_type(const gchar *filename)
 753 {
 754         static GHashTable *mime_type_table = NULL;
 755         MimeType *mime_type;
 756         const gchar *ext, *p;
 757
 758         if (!mime_type_table) {
 759                 mime_type_table = procmime_get_mime_type_table();
 760                 if (!mime_type_table) return NULL;
 761         }
 762
 763         filename = g_basename(filename);
 764         p = strrchr(filename, '.');
 765         if (p)
 766                 ext = p + 1;
 767         else
 768                 return NULL;
 769
 770         mime_type = g_hash_table_lookup(mime_type_table, ext);
 771         if (mime_type) {
 772                 gchar *str;
 773
 774                 str = g_strconcat(mime_type->type, "/", mime_type->sub_type,
 775                                   NULL);
 776                 return str;
 777         }
 778
 779         return NULL;
 780 }
 781
 782 static guint procmime_str_hash(gconstpointer gptr)
 783 {
 784         guint hash_result = 0;
 785         const char *str;
 786
 787         for (str = gptr; str && *str; str++) {
 788                 if (isupper(*str)) hash_result += (*str + ' ');
 789                 else hash_result += *str;
 790         }
 791
 792         return hash_result;
 793 }
 794
 795 static gint procmime_str_equal(gconstpointer gptr1, gconstpointer gptr2)
 796 {
 797         const char *str1 = gptr1;
 798         const char *str2 = gptr2;
 799
 800         return !strcasecmp(str1, str2);
 801 }
 802
 803 static GHashTable *procmime_get_mime_type_table(void)
 804 {
 805         GHashTable *table = NULL;
 806         GList *cur;
 807         MimeType *mime_type;
 808         gchar **exts;
 809
 810         if (!mime_type_list) {
 811                 mime_type_list = procmime_get_mime_type_list();
 812                 if (!mime_type_list) return NULL;
 813         }
 814
 815         table = g_hash_table_new(procmime_str_hash, procmime_str_equal);
 816
 817         for (cur = mime_type_list; cur != NULL; cur = cur->next) {
 818                 gint i;
 819
 820                 mime_type = (MimeType *)cur->data;
 821
 822                 if (!mime_type->extension) continue;
 823
 824                 exts = g_strsplit(mime_type->extension, " ", 16);
 825                 for (i = 0; exts[i] != NULL; i++)
 826                         g_hash_table_insert(table, g_strdup(exts[i]),
 827                                             mime_type);
 828                 g_strfreev(exts);
 829         }
 830
 831         return table;
 832 }
 833
 834 GList *procmime_get_mime_type_list(void)
 835 {
 836         GList *list = NULL;
 837         FILE *fp;
 838         gchar buf[BUFFSIZE];
 839         gchar *p, *delim;
 840         MimeType *mime_type;
 841
 842         if (mime_type_list)
 843                 return mime_type_list;
 844
 845         if ((fp = fopen("/etc/mime.types", "r")) == NULL) {
 846                 if ((fp = fopen(SYSCONFDIR "/mime.types", "r")) == NULL) {
 847                         FILE_OP_ERROR(SYSCONFDIR "/mime.types", "fopen");
 848                         return NULL;
 849                 }
 850         }
 851
 852         while (fgets(buf, sizeof(buf), fp) != NULL) {
 853                 p = strchr(buf, '#');
 854                 if (p) *p = '\0';
 855                 g_strstrip(buf);
 856
 857                 p = buf;
 858                 while (*p && !isspace(*p)) p++;
 859                 if (*p) {
 860                         *p = '\0';
 861                         p++;
 862                 }
 863                 delim = strchr(buf, '/');
 864                 if (delim == NULL) continue;
 865                 *delim = '\0';
 866
 867                 mime_type = g_new(MimeType, 1);
 868                 mime_type->type = g_strdup(buf);
 869                 mime_type->sub_type = g_strdup(delim + 1);
 870
 871                 while (*p && isspace(*p)) p++;
 872                 if (*p)
 873                         mime_type->extension = g_strdup(p);
 874                 else
 875                         mime_type->extension = NULL;
 876
 877                 list = g_list_append(list, mime_type);
 878         }
 879
 880         fclose(fp);
 881
 882         if (!list)
 883                 g_warning("Can't read mime.types\n");
 884
 885         return list;
 886 }
 887
 888 EncodingType procmime_get_encoding_for_charset(const gchar *charset)
 889 {
 890         if (!charset)
 891                 return ENC_8BIT;
 892         else if (!strncasecmp(charset, "ISO-2022-", 9) ||
 893                  !strcasecmp(charset, "US-ASCII"))
 894                 return ENC_7BIT;
 895         else
 896                 return ENC_8BIT;
 897                 /* return ENC_BASE64; */
 898                 /* return ENC_QUOTED_PRINTABLE; */
 899 }
 900
 901 const gchar *procmime_get_encoding_str(EncodingType encoding)
 902 {
 903         static const gchar *encoding_str[] = {
 904                 "7bit", "8bit", "quoted-printable", "base64", "x-uuencode",
 905                 NULL
 906         };
 907
 908         if (encoding >= ENC_7BIT && encoding <= ENC_UNKNOWN)
 909                 return encoding_str[encoding];
 910         else
 911                 return NULL;
 912 }