libcitadel/lib/mime_parser.c

   1 /*
   2  * $Id$
   3  *
   4  * This is the MIME parser for Citadel.
   5  *
   6  * Copyright (c) 1998-2007 by the citadel.org development team.
   7  * This code is distributed under the GNU General Public License v3.
   8  *
   9  */
  10
  11 #include <stdlib.h>
  12 #include <unistd.h>
  13 #include <stdio.h>
  14 #include <signal.h>
  15 #include <sys/types.h>
  16 #include <ctype.h>
  17 #include <string.h>
  18 #include <sys/stat.h>
  19 #include <sys/types.h>
  20 #include <dirent.h>
  21 #include <errno.h>
  22
  23 #include "xdgmime/xdgmime.h"
  24 #include "libcitadel.h"
  25 #include "libcitadellocal.h"
  26
  27 void extract_key(char *target, char *source, char *key)
  28 {
  29         char *ptr;
  30         char looking_for[256];
  31         int double_quotes = 0;
  32
  33         snprintf(looking_for, sizeof looking_for, "%s=", key);
  34
  35         ptr = bmstrcasestr(source, looking_for);
  36         if (ptr == NULL) {
  37                 strcpy(target, "");
  38                 return;
  39         }
  40         strcpy(target, (ptr + strlen(looking_for)));
  41
  42         for (ptr=target; (*ptr != 0); ++ptr) {
  43
  44                 /* A semicolon means we've hit the end of the key, unless we're inside double quotes */
  45                 if ( (double_quotes != 1) && (*ptr == ';')) {
  46                         *ptr = 0;
  47                 }
  48
  49                 /* if we find double quotes, we've got a great set of string boundaries */
  50                 if (*ptr == '\"') {
  51                         ++double_quotes;
  52                         if (double_quotes == 1) {
  53                                 strcpy(ptr, ptr+1);
  54                         }
  55                         else {
  56                                 *ptr = 0;
  57                         }
  58                 }
  59         }
  60 }
  61
  62
  63 /*
  64  * For non-multipart messages, we need to generate a quickie partnum of "1"
  65  * to return to callback functions.  Some callbacks demand it.
  66  */
  67 char *fixed_partnum(char *supplied_partnum) {
  68         if (supplied_partnum == NULL) return "1";
  69         if (strlen(supplied_partnum)==0) return "1";
  70         return supplied_partnum;
  71 }
  72
  73
  74 inline unsigned int decode_hex(char *Source)
  75 {
  76         int ret = 0;
  77         if (*Source  < 'A') {
  78                 ret += (*Source - '0');
  79         }
  80         else {
  81                 ret += (*Source - 'A' + 10);
  82         }
  83         ret = ret << 4;
  84         if (*(Source + 1) < 'A') {
  85                 ret += (*(Source + 1) - '0');
  86         }
  87         else {
  88                 ret += (*(Source + 1) - 'A' + 10);
  89         }
  90         if (ret > 255)
  91                 return 0;
  92         return ret;
  93 }
  94
  95 /*
  96  * Convert "quoted-printable" to binary.  Returns number of bytes decoded.
  97  * according to RFC2045 section 6.7
  98  */
  99 int CtdlDecodeQuotedPrintable(char *decoded, char *encoded, int sourcelen) {
 100         unsigned int ch;
 101         int decoded_length = 0;
 102         int pos = 0;
 103
 104         while (pos < sourcelen)
 105         {
 106                 if (!strncmp(&encoded[pos], "=\r\n", 3))
 107                 {
 108                         pos += 3;
 109                 }
 110                 else if (!strncmp(&encoded[pos], "=\n", 2))
 111                 {
 112                         pos += 2;
 113                 }
 114                 else if (encoded[pos] == '=')
 115                 {
 116                         ch = 0;
 117                         ch = decode_hex(&encoded[pos+1]);
 118                         pos += 3;
 119                         decoded[decoded_length++] = ch;
 120                 }
 121                 else
 122                 {
 123                         decoded[decoded_length++] = encoded[pos];
 124                         pos += 1;
 125                 }
 126         }
 127         decoded[decoded_length] = 0;
 128         return(decoded_length);
 129 }
 130
 131
 132 /*
 133  * Given a message or message-part body and a length, handle any necessary
 134  * decoding and pass the request up the stack.
 135  */
 136 void mime_decode(char *partnum,
 137                  char *part_start, size_t length,
 138                  char *content_type, char *charset, char *encoding,
 139                  char *disposition,
 140                  char *id,
 141                  char *name, char *filename,
 142                  void (*CallBack)
 143                   (char *cbname,
 144                    char *cbfilename,
 145                    char *cbpartnum,
 146                    char *cbdisp,
 147                    void *cbcontent,
 148                    char *cbtype,
 149                    char *cbcharset,
 150                    size_t cblength,
 151                    char *cbencoding,
 152                    char *cbid,
 153                    void *cbuserdata),
 154                  void (*PreMultiPartCallBack)
 155                   (char *cbname,
 156                    char *cbfilename,
 157                    char *cbpartnum,
 158                    char *cbdisp,
 159                    void *cbcontent,
 160                    char *cbtype,
 161                    char *cbcharset,
 162                    size_t cblength,
 163                    char *cbencoding,
 164                    char *cbid,
 165                    void *cbuserdata),
 166                  void (*PostMultiPartCallBack)
 167                   (char *cbname,
 168                    char *cbfilename,
 169                    char *cbpartnum,
 170                    char *cbdisp,
 171                    void *cbcontent,
 172                    char *cbtype,
 173                    char *cbcharset,
 174                    size_t cblength,
 175                    char *cbencoding,
 176                    char *cbid,
 177                    void *cbuserdata),
 178                   void *userdata,
 179                   int dont_decode
 180 )
 181 {
 182
 183         char *decoded;
 184         size_t bytes_decoded = 0;
 185
 186         /* Some encodings aren't really encodings */
 187         if (!strcasecmp(encoding, "7bit"))
 188                 strcpy(encoding, "");
 189         if (!strcasecmp(encoding, "8bit"))
 190                 strcpy(encoding, "");
 191         if (!strcasecmp(encoding, "binary"))
 192                 strcpy(encoding, "");
 193
 194         /* If this part is not encoded, send as-is */
 195         if ( (strlen(encoding) == 0) || (dont_decode)) {
 196                 if (CallBack != NULL) {
 197                         CallBack(name, filename, fixed_partnum(partnum),
 198                                 disposition, part_start,
 199                                 content_type, charset, length, encoding, id, userdata);
 200                         }
 201                 return;
 202         }
 203
 204         /* Fail silently if we hit an unknown encoding. */
 205         if ((strcasecmp(encoding, "base64"))
 206             && (strcasecmp(encoding, "quoted-printable"))) {
 207                 return;
 208         }
 209
 210         /*
 211          * Allocate a buffer for the decoded data.  The output buffer is slightly
 212          * larger than the input buffer; this assumes that the decoded data
 213          * will never be significantly larger than the encoded data.  This is a
 214          * safe assumption with base64, uuencode, and quoted-printable.
 215          */
 216         decoded = malloc(length + 32768);
 217         if (decoded == NULL) {
 218                 return;
 219         }
 220
 221         if (!strcasecmp(encoding, "base64")) {
 222                 bytes_decoded = CtdlDecodeBase64(decoded, part_start, length);
 223         }
 224         else if (!strcasecmp(encoding, "quoted-printable")) {
 225                 bytes_decoded = CtdlDecodeQuotedPrintable(decoded, part_start, length);
 226         }
 227
 228         if (bytes_decoded > 0) if (CallBack != NULL) {
 229                 CallBack(name, filename, fixed_partnum(partnum),
 230                         disposition, decoded,
 231                         content_type, charset, bytes_decoded, "binary", id, userdata);
 232         }
 233
 234         free(decoded);
 235 }
 236
 237 /*
 238  * Break out the components of a multipart message
 239  * (This function expects to be fed HEADERS + CONTENT)
 240  * Note: NULL can be supplied as content_end; in this case, the message is
 241  * considered to have ended when the parser encounters a 0x00 byte.
 242  */
 243 void the_mime_parser(char *partnum,
 244                      char *content_start, char *content_end,
 245                      void (*CallBack)
 246                       (char *cbname,
 247                        char *cbfilename,
 248                        char *cbpartnum,
 249                        char *cbdisp,
 250                        void *cbcontent,
 251                        char *cbtype,
 252                        char *cbcharset,
 253                        size_t cblength,
 254                        char *cbencoding,
 255                        char *cbid,
 256                        void *cbuserdata),
 257                      void (*PreMultiPartCallBack)
 258                       (char *cbname,
 259                        char *cbfilename,
 260                        char *cbpartnum,
 261                        char *cbdisp,
 262                        void *cbcontent,
 263                        char *cbtype,
 264                        char *cbcharset,
 265                        size_t cblength,
 266                        char *cbencoding,
 267                        char *cbid,
 268                        void *cbuserdata),
 269                      void (*PostMultiPartCallBack)
 270                       (char *cbname,
 271                        char *cbfilename,
 272                        char *cbpartnum,
 273                        char *cbdisp,
 274                        void *cbcontent,
 275                        char *cbtype,
 276                        char *cbcharset,
 277                        size_t cblength,
 278                        char *cbencoding,
 279                        char *cbid,
 280                        void *cbuserdata),
 281                       void *userdata,
 282                       int dont_decode
 283 )
 284 {
 285
 286         char *ptr;
 287         char *srch = NULL;
 288         char *part_start, *part_end = NULL;
 289         char buf[SIZ];
 290         char *header;
 291         char *boundary;
 292         char *startary;
 293         size_t startary_len = 0;
 294         char *endary;
 295         char *next_boundary;
 296         char *content_type;
 297         char *charset;
 298         size_t content_length;
 299         char *encoding;
 300         char *disposition;
 301         char *id;
 302         char *name = NULL;
 303         char *content_type_name;
 304         char *content_disposition_name;
 305         char *filename;
 306         int is_multipart;
 307         int part_seq = 0;
 308         int i;
 309         size_t length;
 310         char nested_partnum[256];
 311         int crlf_in_use = 0;
 312         char *evaluate_crlf_ptr = NULL;
 313         int buflen = 0;
 314         int headerlen = 0;
 315
 316         ptr = content_start;
 317         content_length = 0;
 318
 319         boundary = malloc(SIZ);
 320         memset(boundary, 0, SIZ);
 321
 322         startary = malloc(SIZ);
 323         memset(startary, 0, SIZ);
 324
 325         endary = malloc(SIZ);
 326         memset(endary, 0, SIZ);
 327
 328         header = malloc(SIZ);
 329         memset(header, 0, SIZ);
 330
 331         content_type = malloc(SIZ);
 332         memset(content_type, 0, SIZ);
 333
 334         charset = malloc(SIZ);
 335         memset(charset, 0, SIZ);
 336
 337         encoding = malloc(SIZ);
 338         memset(encoding, 0, SIZ);
 339
 340         content_type_name = malloc(SIZ);
 341         memset(content_type_name, 0, SIZ);
 342
 343         content_disposition_name = malloc(SIZ);
 344         memset(content_disposition_name, 0, SIZ);
 345
 346         filename = malloc(SIZ);
 347         memset(filename, 0, SIZ);
 348
 349         disposition = malloc(SIZ);
 350         memset(disposition, 0, SIZ);
 351
 352         id = malloc(SIZ);
 353         memset(id, 0, SIZ);
 354
 355         /* If the caller didn't supply an endpointer, generate one by measure */
 356         if (content_end == NULL) {
 357                 content_end = &content_start[strlen(content_start)];
 358         }
 359
 360         /* Learn interesting things from the headers */
 361         strcpy(header, "");
 362         headerlen = 0;
 363         do {
 364                 ptr = memreadlinelen(ptr, buf, SIZ, &buflen);
 365                 if (ptr >= content_end) {
 366                         goto end_parser;
 367                 }
 368
 369                 for (i = 0; i < buflen; ++i) {
 370                         if (isspace(buf[i])) {
 371                                 buf[i] = ' ';
 372                         }
 373                 }
 374
 375                 if (!isspace(buf[0])) {
 376                         if (!strncasecmp(header, "Content-type:", 13)) {
 377                                 strcpy(content_type, &header[13]);
 378                                 striplt(content_type);
 379                                 extract_key(content_type_name, content_type, "name");
 380                                 extract_key(charset, content_type, "charset");
 381                                 extract_key(boundary, header, "boundary");
 382                                 /* Deal with weird headers */
 383                                 if (strchr(content_type, ' '))
 384                                         *(strchr(content_type, ' ')) = '\0';
 385                                 if (strchr(content_type, ';'))
 386                                         *(strchr(content_type, ';')) = '\0';
 387                         }
 388                         if (!strncasecmp(header, "Content-Disposition:", 20)) {
 389                                 strcpy(disposition, &header[20]);
 390                                 striplt(disposition);
 391                                 extract_key(content_disposition_name, disposition, "name");
 392                                 extract_key(filename, disposition, "filename");
 393                         }
 394                         if (!strncasecmp(header, "Content-ID:", 11)) {
 395                                 strcpy(id, &header[11]);
 396                                 striplt(id);
 397                                 stripallbut(id, '<', '>');
 398                         }
 399                         if (!strncasecmp(header, "Content-length: ", 15)) {
 400                                 char clbuf[10];
 401                                 safestrncpy(clbuf, &header[15], sizeof clbuf);
 402                                 striplt(clbuf);
 403                                 content_length = (size_t) atol(clbuf);
 404                         }
 405                         if (!strncasecmp(header, "Content-transfer-encoding: ", 26)) {
 406                                 strcpy(encoding, &header[26]);
 407                                 striplt(encoding);
 408                         }
 409                         strcpy(header, "");
 410                         headerlen = 0;
 411                 }
 412                 if ((headerlen + buflen + 2) < SIZ) {
 413                         memcpy(&header[headerlen], buf, buflen);
 414                         headerlen += buflen;
 415                         header[headerlen] = '\0';
 416                 }
 417         } while ((!IsEmptyStr(buf)) && (*ptr != 0));
 418
 419         if (strchr(disposition, ';'))
 420                 *(strchr(disposition, ';')) = '\0';
 421         striplt(disposition);
 422         if (strchr(content_type, ';'))
 423                 *(strchr(content_type, ';')) = '\0';
 424         striplt(content_type);
 425
 426         if (!IsEmptyStr(boundary)) {
 427                 is_multipart = 1;
 428         } else {
 429                 is_multipart = 0;
 430         }
 431
 432         /* If this is a multipart message, then recursively process it */
 433         part_start = NULL;
 434         if (is_multipart) {
 435
 436                 /* Tell the client about this message's multipartedness */
 437                 if (PreMultiPartCallBack != NULL) {
 438                         PreMultiPartCallBack("", "", partnum, "",
 439                                 NULL, content_type, charset,
 440                                 0, encoding, id, userdata);
 441                 }
 442
 443                 /* Figure out where the boundaries are */
 444                 snprintf(startary, SIZ, "--%s", boundary);
 445                 snprintf(endary, SIZ, "--%s--", boundary);
 446                 startary_len = strlen(startary);
 447
 448                 part_start = NULL;
 449                 do {
 450                         next_boundary = NULL;
 451                         for (srch=ptr; srch<content_end; ++srch) {
 452                                 if (!memcmp(srch, startary, startary_len)) {
 453                                         next_boundary = srch;
 454                                         srch = content_end;
 455                                 }
 456                         }
 457
 458                         if ( (part_start != NULL) && (next_boundary != NULL) ) {
 459                                 part_end = next_boundary;
 460                                 --part_end;             /* omit the trailing LF */
 461                                 if (crlf_in_use) {
 462                                         --part_end;     /* omit the trailing CR */
 463                                 }
 464
 465                                 if (!IsEmptyStr(partnum)) {
 466                                         snprintf(nested_partnum,
 467                                                  sizeof nested_partnum,
 468                                                  "%s.%d", partnum,
 469                                                  ++part_seq);
 470                                 }
 471                                 else {
 472                                         snprintf(nested_partnum,
 473                                                  sizeof nested_partnum,
 474                                                  "%d", ++part_seq);
 475                                 }
 476                                 the_mime_parser(nested_partnum,
 477                                             part_start, part_end,
 478                                                 CallBack,
 479                                                 PreMultiPartCallBack,
 480                                                 PostMultiPartCallBack,
 481                                                 userdata,
 482                                                 dont_decode);
 483                         }
 484
 485                         if (next_boundary != NULL) {
 486                                 /* If we pass out of scope, don't attempt to
 487                                  * read past the end boundary. */
 488                                 if (!strcmp(next_boundary, endary)) {
 489                                         ptr = content_end;
 490                                 }
 491                                 else {
 492                                         /* Set up for the next part. */
 493                                         part_start = strstr(next_boundary, "\n");
 494
 495                                         /* Determine whether newlines are LF or CRLF */
 496                                         evaluate_crlf_ptr = part_start;
 497                                         --evaluate_crlf_ptr;
 498                                         if (!memcmp(evaluate_crlf_ptr, "\r\n", 2)) {
 499                                                 crlf_in_use = 1;
 500                                         }
 501                                         else {
 502                                                 crlf_in_use = 0;
 503                                         }
 504
 505                                         /* Advance past the LF ... now we're in the next part */
 506                                         ++part_start;
 507                                         ptr = part_start;
 508                                 }
 509                         }
 510                         else {
 511                                 /* Invalid end of multipart.  Bail out! */
 512                                 ptr = content_end;
 513                         }
 514                 } while ( (ptr < content_end) && (next_boundary != NULL) );
 515
 516                 if (PostMultiPartCallBack != NULL) {
 517                         PostMultiPartCallBack("", "", partnum, "", NULL,
 518                                 content_type, charset, 0, encoding, id, userdata);
 519                 }
 520                 goto end_parser;
 521         }
 522
 523         /* If it's not a multipart message, then do something with it */
 524         if (!is_multipart) {
 525                 part_start = ptr;
 526                 length = 0;
 527                 while (ptr < content_end) {
 528                         ++ptr;
 529                         ++length;
 530                 }
 531                 part_end = content_end;
 532
 533
 534                 /* The following code will truncate the MIME part to the size
 535                  * specified by the Content-length: header.   We have commented it
 536                  * out because these headers have a tendency to be wrong.
 537                  *
 538                  *      if ( (content_length > 0) && (length > content_length) ) {
 539                  *              length = content_length;
 540                  *      }
 541                  */
 542
 543                 /* Sometimes the "name" field is tacked on to Content-type,
 544                  * and sometimes it's tacked on to Content-disposition.  Use
 545                  * whichever one we have.
 546                  */
 547                 if (strlen(content_disposition_name) > strlen(content_type_name)) {
 548                         name = content_disposition_name;
 549                 }
 550                 else {
 551                         name = content_type_name;
 552                 }
 553
 554                 /* Ok, we've got a non-multipart part here, so do something with it.
 555                  */
 556                 mime_decode(partnum,
 557                         part_start, length,
 558                         content_type, charset, encoding, disposition, id,
 559                         name, filename,
 560                         CallBack, NULL, NULL,
 561                         userdata, dont_decode
 562                 );
 563
 564                 /*
 565                  * Now if it's an encapsulated message/rfc822 then we have to recurse into it
 566                  */
 567                 if (!strcasecmp(content_type, "message/rfc822")) {
 568
 569                         if (PreMultiPartCallBack != NULL) {
 570                                 PreMultiPartCallBack("", "", partnum, "",
 571                                         NULL, content_type, charset,
 572                                         0, encoding, id, userdata);
 573                         }
 574                         if (CallBack != NULL) {
 575                                 if (strlen(partnum) > 0) {
 576                                         snprintf(nested_partnum,
 577                                                  sizeof nested_partnum,
 578                                                  "%s.%d", partnum,
 579                                                  ++part_seq);
 580                                 }
 581                                 else {
 582                                         snprintf(nested_partnum,
 583                                                  sizeof nested_partnum,
 584                                                  "%d", ++part_seq);
 585                                 }
 586                                 the_mime_parser(nested_partnum,
 587                                         part_start, part_end,
 588                                         CallBack,
 589                                         PreMultiPartCallBack,
 590                                         PostMultiPartCallBack,
 591                                         userdata,
 592                                         dont_decode
 593                                 );
 594                         }
 595                         if (PostMultiPartCallBack != NULL) {
 596                                 PostMultiPartCallBack("", "", partnum, "", NULL,
 597                                         content_type, charset, 0, encoding, id, userdata);
 598                         }
 599
 600
 601                 }
 602
 603         }
 604
 605 end_parser:     /* free the buffers!  end the oppression!! */
 606         free(boundary);
 607         free(startary);
 608         free(endary);
 609         free(header);
 610         free(content_type);
 611         free(charset);
 612         free(encoding);
 613         free(content_type_name);
 614         free(content_disposition_name);
 615         free(filename);
 616         free(disposition);
 617         free(id);
 618 }
 619
 620
 621
 622 /*
 623  * Entry point for the MIME parser.
 624  * (This function expects to be fed HEADERS + CONTENT)
 625  * Note: NULL can be supplied as content_end; in this case, the message is
 626  * considered to have ended when the parser encounters a 0x00 byte.
 627  */
 628 void mime_parser(char *content_start,
 629                 char *content_end,
 630
 631                  void (*CallBack)
 632                   (char *cbname,
 633                    char *cbfilename,
 634                    char *cbpartnum,
 635                    char *cbdisp,
 636                    void *cbcontent,
 637                    char *cbtype,
 638                    char *cbcharset,
 639                    size_t cblength,
 640                    char *cbencoding,
 641                    char *cbid,
 642                    void *cbuserdata),
 643
 644                  void (*PreMultiPartCallBack)
 645                   (char *cbname,
 646                    char *cbfilename,
 647                    char *cbpartnum,
 648                    char *cbdisp,
 649                    void *cbcontent,
 650                    char *cbtype,
 651                    char *cbcharset,
 652                    size_t cblength,
 653                    char *cbencoding,
 654                    char *cbid,
 655                    void *cbuserdata),
 656
 657                  void (*PostMultiPartCallBack)
 658                   (char *cbname,
 659                    char *cbfilename,
 660                    char *cbpartnum,
 661                    char *cbdisp,
 662                    void *cbcontent,
 663                    char *cbtype,
 664                    char *cbcharset,
 665                    size_t cblength,
 666                    char *cbencoding,
 667                    char *cbid,
 668                    void *cbuserdata),
 669
 670                   void *userdata,
 671                   int dont_decode
 672 )
 673 {
 674
 675         the_mime_parser("", content_start, content_end,
 676                         CallBack,
 677                         PreMultiPartCallBack,
 678                         PostMultiPartCallBack,
 679                         userdata, dont_decode);
 680 }
 681
 682
 683
 684
 685
 686
 687 typedef struct _MimeGuess {
 688         const char *Pattern;
 689         size_t PatternLen;
 690         long PatternOffset;
 691         const char *MimeString;
 692 } MimeGuess;
 693
 694 MimeGuess MyMimes [] = {
 695         {
 696                 "GIF",
 697                 3,
 698                 0,
 699                 "image/gif"
 700         },
 701         {
 702                 "\xff\xd8",
 703                 2,
 704                 0,
 705                 "image/jpeg"
 706         },
 707         {
 708                 "\x89PNG",
 709                 4,
 710                 0,
 711                 "image/png"
 712         },
 713         { // last...
 714                 "",
 715                 0,
 716                 0,
 717                 ""
 718         }
 719 };
 720
 721
 722 const char *GuessMimeType(const char *data, size_t dlen)
 723 {
 724         int MimeIndex = 0;
 725
 726         while (MyMimes[MimeIndex].PatternLen != 0)
 727         {
 728                 if ((MyMimes[MimeIndex].PatternLen +
 729                      MyMimes[MimeIndex].PatternOffset < dlen) &&
 730                     strncmp(MyMimes[MimeIndex].Pattern,
 731                             &data[MyMimes[MimeIndex].PatternOffset],
 732                             MyMimes[MimeIndex].PatternLen) == 0)
 733                 {
 734                         return MyMimes[MimeIndex].MimeString;
 735                 }
 736                 MimeIndex ++;
 737         }
 738         /*
 739          * ok, our simple minded algorythm didn't find anything,
 740          * let the big chegger try it, he wil default to application/octet-stream
 741          */
 742         return (xdg_mime_get_mime_type_for_data(data, dlen));
 743 }
 744
 745
 746 const char* GuessMimeByFilename(const char *what, size_t len)
 747 {
 748         /* we know some hardcoded on our own, try them... */
 749         if ((len > 3) && !strncasecmp(&what[len - 4], ".gif", 4))
 750                 return "image/gif";
 751         else if ((len > 2) && !strncasecmp(&what[len - 3], ".js", 3))
 752                 return  "text/javascript";
 753         else if ((len > 3) && !strncasecmp(&what[len - 4], ".txt", 4))
 754                 return "text/plain";
 755         else if ((len > 3) && !strncasecmp(&what[len - 4], ".css", 4))
 756                 return "text/css";
 757         else if ((len > 3) && !strncasecmp(&what[len - 4], ".jpg", 4))
 758                 return "image/jpeg";
 759         else if ((len > 3) && !strncasecmp(&what[len - 4], ".png", 4))
 760                 return "image/png";
 761         else if ((len > 3) && !strncasecmp(&what[len - 4], ".ico", 4))
 762                 return "image/x-icon";
 763         else if ((len > 3) && !strncasecmp(&what[len - 4], ".vcf", 4))
 764                 return "text/x-vcard";
 765         else if ((len > 4) && !strncasecmp(&what[len - 5], ".html", 5))
 766                 return "text/html";
 767         else if ((len > 3) && !strncasecmp(&what[len - 4], ".htm", 4))
 768                 return "text/html";
 769         else if ((len > 3) && !strncasecmp(&what[len - 4], ".wml", 4))
 770                 return "text/vnd.wap.wml";
 771         else if ((len > 4) && !strncasecmp(&what[len - 5], ".wmls", 5))
 772                 return "text/vnd.wap.wmlscript";
 773         else if ((len > 4) && !strncasecmp(&what[len - 5], ".wmlc", 5))
 774                 return "application/vnd.wap.wmlc";
 775         else if ((len > 5) && !strncasecmp(&what[len - 6], ".wmlsc", 6))
 776                 return "application/vnd.wap.wmlscriptc";
 777         else if ((len > 4) && !strncasecmp(&what[len - 5], ".wbmp", 5))
 778                 return "image/vnd.wap.wbmp";
 779         else
 780                 /* and let xdgmime do the fallback. */
 781                 return xdg_mime_get_mime_type_from_file_name(what);
 782 }
 783
 784 static HashList *IconHash = NULL;
 785
 786 typedef struct IconName IconName;
 787
 788 struct IconName {
 789         char *FlatName;
 790         char *FileName;
 791 };
 792
 793 static void DeleteIcon(void *IconNamePtr)
 794 {
 795         IconName *Icon = (IconName*) IconNamePtr;
 796         free(Icon->FlatName);
 797         free(Icon->FileName);
 798         free(Icon);
 799 }
 800
 801 /*
 802 static const char *PrintFlat(void *IconNamePtr)
 803 {
 804         IconName *Icon = (IconName*) IconNamePtr;
 805         return Icon->FlatName;
 806 }
 807 static const char *PrintFile(void *IconNamePtr)
 808 {
 809         IconName *Icon = (IconName*) IconNamePtr;
 810         return Icon->FileName;
 811 }
 812 */
 813
 814 #define GENSTR "x-generic"
 815 #define IGNORE_PREFIX_1 "gnome-mime"
 816 int LoadIconDir(const char *DirName)
 817 {
 818         DIR *filedir = NULL;
 819         struct dirent *filedir_entry;
 820         int d_namelen;
 821         int d_without_ext;
 822         IconName *Icon;
 823
 824         filedir = opendir (DirName);
 825         IconHash = NewHash(1, NULL);
 826         if (filedir == NULL) {
 827                 return 0;
 828         }
 829
 830         while ((filedir_entry = readdir(filedir)))
 831         {
 832                 char *MinorPtr;
 833                 char *PStart;
 834 #ifdef _DIRENT_HAVE_D_NAMELEN
 835                 d_namelen = filedir_entry->d_namelen;
 836 #else
 837                 d_namelen = strlen(filedir_entry->d_name);
 838 #endif
 839                 d_without_ext = d_namelen;
 840                 while ((d_without_ext > 0) && (filedir_entry->d_name[d_without_ext] != '.'))
 841                         d_without_ext --;
 842                 if ((d_without_ext == 0) || (d_namelen < 3))
 843                         continue;
 844
 845                 if ((sizeof(IGNORE_PREFIX_1) < d_namelen) &&
 846                     (strncmp(IGNORE_PREFIX_1,
 847                              filedir_entry->d_name,
 848                              sizeof(IGNORE_PREFIX_1) - 1) == 0)) {
 849                         PStart = filedir_entry->d_name + sizeof(IGNORE_PREFIX_1);
 850                         d_without_ext -= sizeof(IGNORE_PREFIX_1);
 851                 }
 852                 else {
 853                         PStart = filedir_entry->d_name;
 854                 }
 855                 Icon = malloc(sizeof(IconName));
 856
 857                 Icon->FileName = malloc(d_namelen + 1);
 858                 memcpy(Icon->FileName, filedir_entry->d_name, d_namelen + 1);
 859
 860                 Icon->FlatName = malloc(d_without_ext + 1);
 861                 memcpy(Icon->FlatName, PStart, d_without_ext);
 862                 Icon->FlatName[d_without_ext] = '\0';
 863                 /* Try to find Minor type in image-jpeg */
 864                 MinorPtr = strchr(Icon->FlatName, '-');
 865                 if (MinorPtr != NULL) {
 866                         size_t MinorLen;
 867                         MinorLen = 1 + d_without_ext - (MinorPtr - Icon->FlatName + 1);
 868                         if ((MinorLen == sizeof(GENSTR)) &&
 869                             (strncmp(MinorPtr + 1, GENSTR, sizeof(GENSTR)) == 0)) {
 870                                 /* ok, we found a generic filename. cut the generic. */
 871                                 *MinorPtr = '\0';
 872                                 d_without_ext = d_without_ext - (MinorPtr - Icon->FlatName);
 873                         }
 874                         else { /* Map the major / minor separator to / */
 875                                 *MinorPtr = '/';
 876                         }
 877                 }
 878
 879 //              PrintHash(IconHash, PrintFlat, PrintFile);
 880 //              printf("%s - %s\n", Icon->FlatName, Icon->FileName);
 881                 Put(IconHash, Icon->FlatName, d_without_ext, Icon, DeleteIcon);
 882 //              PrintHash(IconHash, PrintFlat, PrintFile);
 883         }
 884         closedir(filedir);
 885         return 1;
 886 }
 887
 888 const char *GetIconFilename(char *MimeType, size_t len)
 889 {
 890         void *vIcon;
 891         IconName *Icon;
 892
 893         if(IconHash == NULL)
 894                 return NULL;
 895
 896         GetHash(IconHash, MimeType, len, &vIcon), Icon = (IconName*) vIcon;
 897         /* didn't find the exact mimetype? try major only. */
 898         if (Icon == NULL) {
 899                 char * pMinor;
 900                 pMinor = strchr(MimeType, '/');
 901                 if (pMinor != NULL) {
 902                         *pMinor = '\0';
 903                         GetHash(IconHash, MimeType, pMinor - MimeType, &vIcon),
 904                                 Icon = (IconName*) vIcon;
 905                 }
 906         }
 907         if (Icon == NULL) {
 908                 return NULL;
 909         }
 910
 911         /*printf("Getting: [%s] == [%s] -> [%s]\n", MimeType, Icon->FlatName, Icon->FileName);*/
 912         return Icon->FileName;
 913 }
 914
 915 void ShutDownLibCitadelMime(void)
 916 {
 917         DeleteHash(&IconHash);
 918 }