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 unsigned int decode_hex(char *Source)
  75 {
  76         int ret = 0;
  77         if (*Source  < 'A') {
  78                 ret += (*Source - '0');
  79         }
  80         else if (*Source > 'Z') {
  81                 ret += (*Source - 'a' + 10);
  82         }
  83         else {
  84                 ret += (*Source - 'A' + 10);
  85         }
  86
  87         ret = ret << 4;
  88
  89         if (*(Source + 1) < 'A') {
  90                 ret += (*(Source + 1) - '0');
  91         }
  92         else if (*(Source + 1) > 'Z') {
  93                 ret += (*(Source + 1) - 'a' + 10);
  94         }
  95         else {
  96                 ret += (*(Source + 1) - 'A' + 10);
  97         }
  98         if (ret > 255)
  99                 return '?';
 100         return ret;
 101 }
 102
 103 /*
 104  * Convert "quoted-printable" to binary.  Returns number of bytes decoded.
 105  * according to RFC2045 section 6.7
 106  */
 107 int CtdlDecodeQuotedPrintable(char *decoded, char *encoded, int sourcelen) {
 108         unsigned int ch;
 109         int decoded_length = 0;
 110         int pos = 0;
 111
 112         while (pos < sourcelen)
 113         {
 114                 if (!strncmp(&encoded[pos], "=\r\n", 3))
 115                 {
 116                         pos += 3;
 117                 }
 118                 else if (!strncmp(&encoded[pos], "=\n", 2))
 119                 {
 120                         pos += 2;
 121                 }
 122                 else if (encoded[pos] == '=')
 123                 {
 124                         ch = 0;
 125                         ch = decode_hex(&encoded[pos+1]);
 126                         pos += 3;
 127                         decoded[decoded_length++] = ch;
 128                 }
 129                 else
 130                 {
 131                         decoded[decoded_length++] = encoded[pos];
 132                         pos += 1;
 133                 }
 134         }
 135         decoded[decoded_length] = 0;
 136         return(decoded_length);
 137 }
 138
 139
 140 /*
 141  * Given a message or message-part body and a length, handle any necessary
 142  * decoding and pass the request up the stack.
 143  */
 144 void mime_decode(char *partnum,
 145                  char *part_start, size_t length,
 146                  char *content_type, char *charset, char *encoding,
 147                  char *disposition,
 148                  char *id,
 149                  char *name, char *filename,
 150                  void (*CallBack)
 151                   (char *cbname,
 152                    char *cbfilename,
 153                    char *cbpartnum,
 154                    char *cbdisp,
 155                    void *cbcontent,
 156                    char *cbtype,
 157                    char *cbcharset,
 158                    size_t cblength,
 159                    char *cbencoding,
 160                    char *cbid,
 161                    void *cbuserdata),
 162                  void (*PreMultiPartCallBack)
 163                   (char *cbname,
 164                    char *cbfilename,
 165                    char *cbpartnum,
 166                    char *cbdisp,
 167                    void *cbcontent,
 168                    char *cbtype,
 169                    char *cbcharset,
 170                    size_t cblength,
 171                    char *cbencoding,
 172                    char *cbid,
 173                    void *cbuserdata),
 174                  void (*PostMultiPartCallBack)
 175                   (char *cbname,
 176                    char *cbfilename,
 177                    char *cbpartnum,
 178                    char *cbdisp,
 179                    void *cbcontent,
 180                    char *cbtype,
 181                    char *cbcharset,
 182                    size_t cblength,
 183                    char *cbencoding,
 184                    char *cbid,
 185                    void *cbuserdata),
 186                   void *userdata,
 187                   int dont_decode
 188 )
 189 {
 190
 191         char *decoded;
 192         size_t bytes_decoded = 0;
 193
 194         /* Some encodings aren't really encodings */
 195         if (!strcasecmp(encoding, "7bit"))
 196                 strcpy(encoding, "");
 197         if (!strcasecmp(encoding, "8bit"))
 198                 strcpy(encoding, "");
 199         if (!strcasecmp(encoding, "binary"))
 200                 strcpy(encoding, "");
 201
 202         /* If this part is not encoded, send as-is */
 203         if ( (strlen(encoding) == 0) || (dont_decode)) {
 204                 if (CallBack != NULL) {
 205                         CallBack(name, filename, fixed_partnum(partnum),
 206                                 disposition, part_start,
 207                                 content_type, charset, length, encoding, id, userdata);
 208                         }
 209                 return;
 210         }
 211
 212         /* Fail silently if we hit an unknown encoding. */
 213         if ((strcasecmp(encoding, "base64"))
 214             && (strcasecmp(encoding, "quoted-printable"))) {
 215                 return;
 216         }
 217
 218         /*
 219          * Allocate a buffer for the decoded data.  The output buffer is slightly
 220          * larger than the input buffer; this assumes that the decoded data
 221          * will never be significantly larger than the encoded data.  This is a
 222          * safe assumption with base64, uuencode, and quoted-printable.
 223          */
 224         decoded = malloc(length + 32768);
 225         if (decoded == NULL) {
 226                 return;
 227         }
 228
 229         if (!strcasecmp(encoding, "base64")) {
 230                 bytes_decoded = CtdlDecodeBase64(decoded, part_start, length);
 231         }
 232         else if (!strcasecmp(encoding, "quoted-printable")) {
 233                 bytes_decoded = CtdlDecodeQuotedPrintable(decoded, part_start, length);
 234         }
 235
 236         if (bytes_decoded > 0) if (CallBack != NULL) {
 237                 CallBack(name, filename, fixed_partnum(partnum),
 238                         disposition, decoded,
 239                         content_type, charset, bytes_decoded, "binary", id, userdata);
 240         }
 241
 242         free(decoded);
 243 }
 244
 245 /*
 246  * Break out the components of a multipart message
 247  * (This function expects to be fed HEADERS + CONTENT)
 248  * Note: NULL can be supplied as content_end; in this case, the message is
 249  * considered to have ended when the parser encounters a 0x00 byte.
 250  */
 251 void the_mime_parser(char *partnum,
 252                      char *content_start, char *content_end,
 253                      void (*CallBack)
 254                       (char *cbname,
 255                        char *cbfilename,
 256                        char *cbpartnum,
 257                        char *cbdisp,
 258                        void *cbcontent,
 259                        char *cbtype,
 260                        char *cbcharset,
 261                        size_t cblength,
 262                        char *cbencoding,
 263                        char *cbid,
 264                        void *cbuserdata),
 265                      void (*PreMultiPartCallBack)
 266                       (char *cbname,
 267                        char *cbfilename,
 268                        char *cbpartnum,
 269                        char *cbdisp,
 270                        void *cbcontent,
 271                        char *cbtype,
 272                        char *cbcharset,
 273                        size_t cblength,
 274                        char *cbencoding,
 275                        char *cbid,
 276                        void *cbuserdata),
 277                      void (*PostMultiPartCallBack)
 278                       (char *cbname,
 279                        char *cbfilename,
 280                        char *cbpartnum,
 281                        char *cbdisp,
 282                        void *cbcontent,
 283                        char *cbtype,
 284                        char *cbcharset,
 285                        size_t cblength,
 286                        char *cbencoding,
 287                        char *cbid,
 288                        void *cbuserdata),
 289                       void *userdata,
 290                       int dont_decode
 291 )
 292 {
 293
 294         char *ptr;
 295         char *srch = NULL;
 296         char *part_start, *part_end = NULL;
 297         char buf[SIZ];
 298         char *header;
 299         char *boundary;
 300         char *startary;
 301         size_t startary_len = 0;
 302         char *endary;
 303         char *next_boundary;
 304         char *content_type;
 305         char *charset;
 306         size_t content_length;
 307         char *encoding;
 308         char *disposition;
 309         char *id;
 310         char *name = NULL;
 311         char *content_type_name;
 312         char *content_disposition_name;
 313         char *filename;
 314         int is_multipart;
 315         int part_seq = 0;
 316         int i;
 317         size_t length;
 318         char nested_partnum[256];
 319         int crlf_in_use = 0;
 320         char *evaluate_crlf_ptr = NULL;
 321         int buflen = 0;
 322         int headerlen = 0;
 323
 324         ptr = content_start;
 325         content_length = 0;
 326
 327         boundary = malloc(SIZ);
 328         memset(boundary, 0, SIZ);
 329
 330         startary = malloc(SIZ);
 331         memset(startary, 0, SIZ);
 332
 333         endary = malloc(SIZ);
 334         memset(endary, 0, SIZ);
 335
 336         header = malloc(SIZ);
 337         memset(header, 0, SIZ);
 338
 339         content_type = malloc(SIZ);
 340         memset(content_type, 0, SIZ);
 341
 342         charset = malloc(SIZ);
 343         memset(charset, 0, SIZ);
 344
 345         encoding = malloc(SIZ);
 346         memset(encoding, 0, SIZ);
 347
 348         content_type_name = malloc(SIZ);
 349         memset(content_type_name, 0, SIZ);
 350
 351         content_disposition_name = malloc(SIZ);
 352         memset(content_disposition_name, 0, SIZ);
 353
 354         filename = malloc(SIZ);
 355         memset(filename, 0, SIZ);
 356
 357         disposition = malloc(SIZ);
 358         memset(disposition, 0, SIZ);
 359
 360         id = malloc(SIZ);
 361         memset(id, 0, SIZ);
 362
 363         /* If the caller didn't supply an endpointer, generate one by measure */
 364         if (content_end == NULL) {
 365                 content_end = &content_start[strlen(content_start)];
 366         }
 367
 368         /* Learn interesting things from the headers */
 369         strcpy(header, "");
 370         headerlen = 0;
 371         do {
 372                 ptr = memreadlinelen(ptr, buf, SIZ, &buflen);
 373                 if (ptr >= content_end) {
 374                         goto end_parser;
 375                 }
 376
 377                 for (i = 0; i < buflen; ++i) {
 378                         if (isspace(buf[i])) {
 379                                 buf[i] = ' ';
 380                         }
 381                 }
 382
 383                 if (!isspace(buf[0])) {
 384                         if (!strncasecmp(header, "Content-type:", 13)) {
 385                                 strcpy(content_type, &header[13]);
 386                                 striplt(content_type);
 387                                 extract_key(content_type_name, content_type, "name");
 388                                 extract_key(charset, content_type, "charset");
 389                                 extract_key(boundary, header, "boundary");
 390                                 /* Deal with weird headers */
 391                                 if (strchr(content_type, ' '))
 392                                         *(strchr(content_type, ' ')) = '\0';
 393                                 if (strchr(content_type, ';'))
 394                                         *(strchr(content_type, ';')) = '\0';
 395                         }
 396                         if (!strncasecmp(header, "Content-Disposition:", 20)) {
 397                                 strcpy(disposition, &header[20]);
 398                                 striplt(disposition);
 399                                 extract_key(content_disposition_name, disposition, "name");
 400                                 extract_key(filename, disposition, "filename");
 401                         }
 402                         if (!strncasecmp(header, "Content-ID:", 11)) {
 403                                 strcpy(id, &header[11]);
 404                                 striplt(id);
 405                                 stripallbut(id, '<', '>');
 406                         }
 407                         if (!strncasecmp(header, "Content-length: ", 15)) {
 408                                 char clbuf[10];
 409                                 safestrncpy(clbuf, &header[15], sizeof clbuf);
 410                                 striplt(clbuf);
 411                                 content_length = (size_t) atol(clbuf);
 412                         }
 413                         if (!strncasecmp(header, "Content-transfer-encoding: ", 26)) {
 414                                 strcpy(encoding, &header[26]);
 415                                 striplt(encoding);
 416                         }
 417                         strcpy(header, "");
 418                         headerlen = 0;
 419                 }
 420                 if ((headerlen + buflen + 2) < SIZ) {
 421                         memcpy(&header[headerlen], buf, buflen);
 422                         headerlen += buflen;
 423                         header[headerlen] = '\0';
 424                 }
 425         } while ((!IsEmptyStr(buf)) && (*ptr != 0));
 426
 427         if (strchr(disposition, ';'))
 428                 *(strchr(disposition, ';')) = '\0';
 429         striplt(disposition);
 430         if (strchr(content_type, ';'))
 431                 *(strchr(content_type, ';')) = '\0';
 432         striplt(content_type);
 433
 434         if (!IsEmptyStr(boundary)) {
 435                 is_multipart = 1;
 436         } else {
 437                 is_multipart = 0;
 438         }
 439
 440         /* If this is a multipart message, then recursively process it */
 441         part_start = NULL;
 442         if (is_multipart) {
 443
 444                 /* Tell the client about this message's multipartedness */
 445                 if (PreMultiPartCallBack != NULL) {
 446                         PreMultiPartCallBack("", "", partnum, "",
 447                                 NULL, content_type, charset,
 448                                 0, encoding, id, userdata);
 449                 }
 450
 451                 /* Figure out where the boundaries are */
 452                 snprintf(startary, SIZ, "--%s", boundary);
 453                 snprintf(endary, SIZ, "--%s--", boundary);
 454                 startary_len = strlen(startary);
 455
 456                 part_start = NULL;
 457                 do {
 458                         next_boundary = NULL;
 459                         for (srch=ptr; srch<content_end; ++srch) {
 460                                 if (!memcmp(srch, startary, startary_len)) {
 461                                         next_boundary = srch;
 462                                         srch = content_end;
 463                                 }
 464                         }
 465
 466                         if ( (part_start != NULL) && (next_boundary != NULL) ) {
 467                                 part_end = next_boundary;
 468                                 --part_end;             /* omit the trailing LF */
 469                                 if (crlf_in_use) {
 470                                         --part_end;     /* omit the trailing CR */
 471                                 }
 472
 473                                 if (!IsEmptyStr(partnum)) {
 474                                         snprintf(nested_partnum,
 475                                                  sizeof nested_partnum,
 476                                                  "%s.%d", partnum,
 477                                                  ++part_seq);
 478                                 }
 479                                 else {
 480                                         snprintf(nested_partnum,
 481                                                  sizeof nested_partnum,
 482                                                  "%d", ++part_seq);
 483                                 }
 484                                 the_mime_parser(nested_partnum,
 485                                             part_start, part_end,
 486                                                 CallBack,
 487                                                 PreMultiPartCallBack,
 488                                                 PostMultiPartCallBack,
 489                                                 userdata,
 490                                                 dont_decode);
 491                         }
 492
 493                         if (next_boundary != NULL) {
 494                                 /* If we pass out of scope, don't attempt to
 495                                  * read past the end boundary. */
 496                                 if (!strcmp(next_boundary, endary)) {
 497                                         ptr = content_end;
 498                                 }
 499                                 else {
 500                                         /* Set up for the next part. */
 501                                         part_start = strstr(next_boundary, "\n");
 502
 503                                         /* Determine whether newlines are LF or CRLF */
 504                                         evaluate_crlf_ptr = part_start;
 505                                         --evaluate_crlf_ptr;
 506                                         if (!memcmp(evaluate_crlf_ptr, "\r\n", 2)) {
 507                                                 crlf_in_use = 1;
 508                                         }
 509                                         else {
 510                                                 crlf_in_use = 0;
 511                                         }
 512
 513                                         /* Advance past the LF ... now we're in the next part */
 514                                         ++part_start;
 515                                         ptr = part_start;
 516                                 }
 517                         }
 518                         else {
 519                                 /* Invalid end of multipart.  Bail out! */
 520                                 ptr = content_end;
 521                         }
 522                 } while ( (ptr < content_end) && (next_boundary != NULL) );
 523
 524                 if (PostMultiPartCallBack != NULL) {
 525                         PostMultiPartCallBack("", "", partnum, "", NULL,
 526                                 content_type, charset, 0, encoding, id, userdata);
 527                 }
 528                 goto end_parser;
 529         }
 530
 531         /* If it's not a multipart message, then do something with it */
 532         if (!is_multipart) {
 533                 part_start = ptr;
 534                 length = 0;
 535                 while (ptr < content_end) {
 536                         ++ptr;
 537                         ++length;
 538                 }
 539                 part_end = content_end;
 540
 541
 542                 /* The following code will truncate the MIME part to the size
 543                  * specified by the Content-length: header.   We have commented it
 544                  * out because these headers have a tendency to be wrong.
 545                  *
 546                  *      if ( (content_length > 0) && (length > content_length) ) {
 547                  *              length = content_length;
 548                  *      }
 549                  */
 550
 551                 /* Sometimes the "name" field is tacked on to Content-type,
 552                  * and sometimes it's tacked on to Content-disposition.  Use
 553                  * whichever one we have.
 554                  */
 555                 if (strlen(content_disposition_name) > strlen(content_type_name)) {
 556                         name = content_disposition_name;
 557                 }
 558                 else {
 559                         name = content_type_name;
 560                 }
 561
 562                 /* Ok, we've got a non-multipart part here, so do something with it.
 563                  */
 564                 mime_decode(partnum,
 565                         part_start, length,
 566                         content_type, charset, encoding, disposition, id,
 567                         name, filename,
 568                         CallBack, NULL, NULL,
 569                         userdata, dont_decode
 570                 );
 571
 572                 /*
 573                  * Now if it's an encapsulated message/rfc822 then we have to recurse into it
 574                  */
 575                 if (!strcasecmp(content_type, "message/rfc822")) {
 576
 577                         if (PreMultiPartCallBack != NULL) {
 578                                 PreMultiPartCallBack("", "", partnum, "",
 579                                         NULL, content_type, charset,
 580                                         0, encoding, id, userdata);
 581                         }
 582                         if (CallBack != NULL) {
 583                                 if (strlen(partnum) > 0) {
 584                                         snprintf(nested_partnum,
 585                                                  sizeof nested_partnum,
 586                                                  "%s.%d", partnum,
 587                                                  ++part_seq);
 588                                 }
 589                                 else {
 590                                         snprintf(nested_partnum,
 591                                                  sizeof nested_partnum,
 592                                                  "%d", ++part_seq);
 593                                 }
 594                                 the_mime_parser(nested_partnum,
 595                                         part_start, part_end,
 596                                         CallBack,
 597                                         PreMultiPartCallBack,
 598                                         PostMultiPartCallBack,
 599                                         userdata,
 600                                         dont_decode
 601                                 );
 602                         }
 603                         if (PostMultiPartCallBack != NULL) {
 604                                 PostMultiPartCallBack("", "", partnum, "", NULL,
 605                                         content_type, charset, 0, encoding, id, userdata);
 606                         }
 607
 608
 609                 }
 610
 611         }
 612
 613 end_parser:     /* free the buffers!  end the oppression!! */
 614         free(boundary);
 615         free(startary);
 616         free(endary);
 617         free(header);
 618         free(content_type);
 619         free(charset);
 620         free(encoding);
 621         free(content_type_name);
 622         free(content_disposition_name);
 623         free(filename);
 624         free(disposition);
 625         free(id);
 626 }
 627
 628
 629
 630 /*
 631  * Entry point for the MIME parser.
 632  * (This function expects to be fed HEADERS + CONTENT)
 633  * Note: NULL can be supplied as content_end; in this case, the message is
 634  * considered to have ended when the parser encounters a 0x00 byte.
 635  */
 636 void mime_parser(char *content_start,
 637                 char *content_end,
 638
 639                  void (*CallBack)
 640                   (char *cbname,
 641                    char *cbfilename,
 642                    char *cbpartnum,
 643                    char *cbdisp,
 644                    void *cbcontent,
 645                    char *cbtype,
 646                    char *cbcharset,
 647                    size_t cblength,
 648                    char *cbencoding,
 649                    char *cbid,
 650                    void *cbuserdata),
 651
 652                  void (*PreMultiPartCallBack)
 653                   (char *cbname,
 654                    char *cbfilename,
 655                    char *cbpartnum,
 656                    char *cbdisp,
 657                    void *cbcontent,
 658                    char *cbtype,
 659                    char *cbcharset,
 660                    size_t cblength,
 661                    char *cbencoding,
 662                    char *cbid,
 663                    void *cbuserdata),
 664
 665                  void (*PostMultiPartCallBack)
 666                   (char *cbname,
 667                    char *cbfilename,
 668                    char *cbpartnum,
 669                    char *cbdisp,
 670                    void *cbcontent,
 671                    char *cbtype,
 672                    char *cbcharset,
 673                    size_t cblength,
 674                    char *cbencoding,
 675                    char *cbid,
 676                    void *cbuserdata),
 677
 678                   void *userdata,
 679                   int dont_decode
 680 )
 681 {
 682
 683         the_mime_parser("", content_start, content_end,
 684                         CallBack,
 685                         PreMultiPartCallBack,
 686                         PostMultiPartCallBack,
 687                         userdata, dont_decode);
 688 }
 689
 690
 691
 692
 693
 694
 695 typedef struct _MimeGuess {
 696         const char *Pattern;
 697         size_t PatternLen;
 698         long PatternOffset;
 699         const char *MimeString;
 700 } MimeGuess;
 701
 702 MimeGuess MyMimes [] = {
 703         {
 704                 "GIF",
 705                 3,
 706                 0,
 707                 "image/gif"
 708         },
 709         {
 710                 "\xff\xd8",
 711                 2,
 712                 0,
 713                 "image/jpeg"
 714         },
 715         {
 716                 "\x89PNG",
 717                 4,
 718                 0,
 719                 "image/png"
 720         },
 721         { // last...
 722                 "",
 723                 0,
 724                 0,
 725                 ""
 726         }
 727 };
 728
 729
 730 const char *GuessMimeType(const char *data, size_t dlen)
 731 {
 732         int MimeIndex = 0;
 733
 734         while (MyMimes[MimeIndex].PatternLen != 0)
 735         {
 736                 if ((MyMimes[MimeIndex].PatternLen +
 737                      MyMimes[MimeIndex].PatternOffset < dlen) &&
 738                     strncmp(MyMimes[MimeIndex].Pattern,
 739                             &data[MyMimes[MimeIndex].PatternOffset],
 740                             MyMimes[MimeIndex].PatternLen) == 0)
 741                 {
 742                         return MyMimes[MimeIndex].MimeString;
 743                 }
 744                 MimeIndex ++;
 745         }
 746         /*
 747          * ok, our simple minded algorythm didn't find anything,
 748          * let the big chegger try it, he wil default to application/octet-stream
 749          */
 750         return (xdg_mime_get_mime_type_for_data(data, dlen));
 751 }
 752
 753
 754 const char* GuessMimeByFilename(const char *what, size_t len)
 755 {
 756         /* we know some hardcoded on our own, try them... */
 757         if ((len > 3) && !strncasecmp(&what[len - 4], ".gif", 4))
 758                 return "image/gif";
 759         else if ((len > 2) && !strncasecmp(&what[len - 3], ".js", 3))
 760                 return  "text/javascript";
 761         else if ((len > 3) && !strncasecmp(&what[len - 4], ".txt", 4))
 762                 return "text/plain";
 763         else if ((len > 3) && !strncasecmp(&what[len - 4], ".css", 4))
 764                 return "text/css";
 765         else if ((len > 3) && !strncasecmp(&what[len - 4], ".jpg", 4))
 766                 return "image/jpeg";
 767         else if ((len > 3) && !strncasecmp(&what[len - 4], ".png", 4))
 768                 return "image/png";
 769         else if ((len > 3) && !strncasecmp(&what[len - 4], ".ico", 4))
 770                 return "image/x-icon";
 771         else if ((len > 3) && !strncasecmp(&what[len - 4], ".vcf", 4))
 772                 return "text/x-vcard";
 773         else if ((len > 4) && !strncasecmp(&what[len - 5], ".html", 5))
 774                 return "text/html";
 775         else if ((len > 3) && !strncasecmp(&what[len - 4], ".htm", 4))
 776                 return "text/html";
 777         else if ((len > 3) && !strncasecmp(&what[len - 4], ".wml", 4))
 778                 return "text/vnd.wap.wml";
 779         else if ((len > 4) && !strncasecmp(&what[len - 5], ".wmls", 5))
 780                 return "text/vnd.wap.wmlscript";
 781         else if ((len > 4) && !strncasecmp(&what[len - 5], ".wmlc", 5))
 782                 return "application/vnd.wap.wmlc";
 783         else if ((len > 5) && !strncasecmp(&what[len - 6], ".wmlsc", 6))
 784                 return "application/vnd.wap.wmlscriptc";
 785         else if ((len > 4) && !strncasecmp(&what[len - 5], ".wbmp", 5))
 786                 return "image/vnd.wap.wbmp";
 787         else
 788                 /* and let xdgmime do the fallback. */
 789                 return xdg_mime_get_mime_type_from_file_name(what);
 790 }
 791
 792 static HashList *IconHash = NULL;
 793
 794 typedef struct IconName IconName;
 795
 796 struct IconName {
 797         char *FlatName;
 798         char *FileName;
 799 };
 800
 801 static void DeleteIcon(void *IconNamePtr)
 802 {
 803         IconName *Icon = (IconName*) IconNamePtr;
 804         free(Icon->FlatName);
 805         free(Icon->FileName);
 806         free(Icon);
 807 }
 808
 809 /*
 810 static const char *PrintFlat(void *IconNamePtr)
 811 {
 812         IconName *Icon = (IconName*) IconNamePtr;
 813         return Icon->FlatName;
 814 }
 815 static const char *PrintFile(void *IconNamePtr)
 816 {
 817         IconName *Icon = (IconName*) IconNamePtr;
 818         return Icon->FileName;
 819 }
 820 */
 821
 822 #define GENSTR "x-generic"
 823 #define IGNORE_PREFIX_1 "gnome-mime"
 824 int LoadIconDir(const char *DirName)
 825 {
 826         DIR *filedir = NULL;
 827         struct dirent *filedir_entry;
 828         int d_namelen;
 829         int d_without_ext;
 830         IconName *Icon;
 831
 832         filedir = opendir (DirName);
 833         IconHash = NewHash(1, NULL);
 834         if (filedir == NULL) {
 835                 return 0;
 836         }
 837
 838         while ((filedir_entry = readdir(filedir)))
 839         {
 840                 char *MinorPtr;
 841                 char *PStart;
 842 #ifdef _DIRENT_HAVE_D_NAMELEN
 843                 d_namelen = filedir_entry->d_namelen;
 844 #else
 845                 d_namelen = strlen(filedir_entry->d_name);
 846 #endif
 847                 d_without_ext = d_namelen;
 848                 while ((d_without_ext > 0) && (filedir_entry->d_name[d_without_ext] != '.'))
 849                         d_without_ext --;
 850                 if ((d_without_ext == 0) || (d_namelen < 3))
 851                         continue;
 852
 853                 if ((sizeof(IGNORE_PREFIX_1) < d_namelen) &&
 854                     (strncmp(IGNORE_PREFIX_1,
 855                              filedir_entry->d_name,
 856                              sizeof(IGNORE_PREFIX_1) - 1) == 0)) {
 857                         PStart = filedir_entry->d_name + sizeof(IGNORE_PREFIX_1);
 858                         d_without_ext -= sizeof(IGNORE_PREFIX_1);
 859                 }
 860                 else {
 861                         PStart = filedir_entry->d_name;
 862                 }
 863                 Icon = malloc(sizeof(IconName));
 864
 865                 Icon->FileName = malloc(d_namelen + 1);
 866                 memcpy(Icon->FileName, filedir_entry->d_name, d_namelen + 1);
 867
 868                 Icon->FlatName = malloc(d_without_ext + 1);
 869                 memcpy(Icon->FlatName, PStart, d_without_ext);
 870                 Icon->FlatName[d_without_ext] = '\0';
 871                 /* Try to find Minor type in image-jpeg */
 872                 MinorPtr = strchr(Icon->FlatName, '-');
 873                 if (MinorPtr != NULL) {
 874                         size_t MinorLen;
 875                         MinorLen = 1 + d_without_ext - (MinorPtr - Icon->FlatName + 1);
 876                         if ((MinorLen == sizeof(GENSTR)) &&
 877                             (strncmp(MinorPtr + 1, GENSTR, sizeof(GENSTR)) == 0)) {
 878                                 /* ok, we found a generic filename. cut the generic. */
 879                                 *MinorPtr = '\0';
 880                                 d_without_ext = d_without_ext - (MinorPtr - Icon->FlatName);
 881                         }
 882                         else { /* Map the major / minor separator to / */
 883                                 *MinorPtr = '/';
 884                         }
 885                 }
 886
 887 //              PrintHash(IconHash, PrintFlat, PrintFile);
 888 //              printf("%s - %s\n", Icon->FlatName, Icon->FileName);
 889                 Put(IconHash, Icon->FlatName, d_without_ext, Icon, DeleteIcon);
 890 //              PrintHash(IconHash, PrintFlat, PrintFile);
 891         }
 892         closedir(filedir);
 893         return 1;
 894 }
 895
 896 const char *GetIconFilename(char *MimeType, size_t len)
 897 {
 898         void *vIcon;
 899         IconName *Icon;
 900
 901         if(IconHash == NULL)
 902                 return NULL;
 903
 904         GetHash(IconHash, MimeType, len, &vIcon), Icon = (IconName*) vIcon;
 905         /* didn't find the exact mimetype? try major only. */
 906         if (Icon == NULL) {
 907                 char * pMinor;
 908                 pMinor = strchr(MimeType, '/');
 909                 if (pMinor != NULL) {
 910                         *pMinor = '\0';
 911                         GetHash(IconHash, MimeType, pMinor - MimeType, &vIcon),
 912                                 Icon = (IconName*) vIcon;
 913                 }
 914         }
 915         if (Icon == NULL) {
 916                 return NULL;
 917         }
 918
 919         /*printf("Getting: [%s] == [%s] -> [%s]\n", MimeType, Icon->FlatName, Icon->FileName);*/
 920         return Icon->FileName;
 921 }
 922
 923 void ShutDownLibCitadelMime(void)
 924 {
 925         DeleteHash(&IconHash);
 926 }