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
  75 /*
  76  * Convert "quoted-printable" to binary.  Returns number of bytes decoded.
  77  * according to RFC2045 section 6.7
  78  */
  79 int CtdlDecodeQuotedPrintable(char *decoded, char *encoded, int sourcelen) {
  80         unsigned int ch;
  81         int decoded_length = 0;
  82         int pos = 0;
  83
  84         while (pos < sourcelen)
  85         {
  86                 if (!strncmp(&encoded[pos], "=\r\n", 3))
  87                 {
  88                         pos += 3;
  89                 }
  90                 else if (!strncmp(&encoded[pos], "=\n", 2))
  91                 {
  92                         pos += 2;
  93                 }
  94                 else if (encoded[pos] == '=')
  95                 {
  96                         ch = 0;
  97                         sscanf(&encoded[pos+1], "%02x", &ch);
  98                         pos += 3;
  99                         decoded[decoded_length++] = ch;
 100                 }
 101                 else
 102                 {
 103                         decoded[decoded_length++] = encoded[pos];
 104                         pos += 1;
 105                 }
 106         }
 107         decoded[decoded_length] = 0;
 108         return(decoded_length);
 109 }
 110
 111
 112 /*
 113  * Given a message or message-part body and a length, handle any necessary
 114  * decoding and pass the request up the stack.
 115  */
 116 void mime_decode(char *partnum,
 117                  char *part_start, size_t length,
 118                  char *content_type, char *charset, char *encoding,
 119                  char *disposition,
 120                  char *id,
 121                  char *name, char *filename,
 122                  void (*CallBack)
 123                   (char *cbname,
 124                    char *cbfilename,
 125                    char *cbpartnum,
 126                    char *cbdisp,
 127                    void *cbcontent,
 128                    char *cbtype,
 129                    char *cbcharset,
 130                    size_t cblength,
 131                    char *cbencoding,
 132                    char *cbid,
 133                    void *cbuserdata),
 134                  void (*PreMultiPartCallBack)
 135                   (char *cbname,
 136                    char *cbfilename,
 137                    char *cbpartnum,
 138                    char *cbdisp,
 139                    void *cbcontent,
 140                    char *cbtype,
 141                    char *cbcharset,
 142                    size_t cblength,
 143                    char *cbencoding,
 144                    char *cbid,
 145                    void *cbuserdata),
 146                  void (*PostMultiPartCallBack)
 147                   (char *cbname,
 148                    char *cbfilename,
 149                    char *cbpartnum,
 150                    char *cbdisp,
 151                    void *cbcontent,
 152                    char *cbtype,
 153                    char *cbcharset,
 154                    size_t cblength,
 155                    char *cbencoding,
 156                    char *cbid,
 157                    void *cbuserdata),
 158                   void *userdata,
 159                   int dont_decode
 160 )
 161 {
 162
 163         char *decoded;
 164         size_t bytes_decoded = 0;
 165
 166         /* Some encodings aren't really encodings */
 167         if (!strcasecmp(encoding, "7bit"))
 168                 strcpy(encoding, "");
 169         if (!strcasecmp(encoding, "8bit"))
 170                 strcpy(encoding, "");
 171         if (!strcasecmp(encoding, "binary"))
 172                 strcpy(encoding, "");
 173
 174         /* If this part is not encoded, send as-is */
 175         if ( (strlen(encoding) == 0) || (dont_decode)) {
 176                 if (CallBack != NULL) {
 177                         CallBack(name, filename, fixed_partnum(partnum),
 178                                 disposition, part_start,
 179                                 content_type, charset, length, encoding, id, userdata);
 180                         }
 181                 return;
 182         }
 183
 184         /* Fail silently if we hit an unknown encoding. */
 185         if ((strcasecmp(encoding, "base64"))
 186             && (strcasecmp(encoding, "quoted-printable"))) {
 187                 return;
 188         }
 189
 190         /*
 191          * Allocate a buffer for the decoded data.  The output buffer is slightly
 192          * larger than the input buffer; this assumes that the decoded data
 193          * will never be significantly larger than the encoded data.  This is a
 194          * safe assumption with base64, uuencode, and quoted-printable.
 195          */
 196         decoded = malloc(length + 32768);
 197         if (decoded == NULL) {
 198                 return;
 199         }
 200
 201         if (!strcasecmp(encoding, "base64")) {
 202                 bytes_decoded = CtdlDecodeBase64(decoded, part_start, length);
 203         }
 204         else if (!strcasecmp(encoding, "quoted-printable")) {
 205                 bytes_decoded = CtdlDecodeQuotedPrintable(decoded, part_start, length);
 206         }
 207
 208         if (bytes_decoded > 0) if (CallBack != NULL) {
 209                 CallBack(name, filename, fixed_partnum(partnum),
 210                         disposition, decoded,
 211                         content_type, charset, bytes_decoded, "binary", id, userdata);
 212         }
 213
 214         free(decoded);
 215 }
 216
 217 /*
 218  * Break out the components of a multipart message
 219  * (This function expects to be fed HEADERS + CONTENT)
 220  * Note: NULL can be supplied as content_end; in this case, the message is
 221  * considered to have ended when the parser encounters a 0x00 byte.
 222  */
 223 void the_mime_parser(char *partnum,
 224                      char *content_start, char *content_end,
 225                      void (*CallBack)
 226                       (char *cbname,
 227                        char *cbfilename,
 228                        char *cbpartnum,
 229                        char *cbdisp,
 230                        void *cbcontent,
 231                        char *cbtype,
 232                        char *cbcharset,
 233                        size_t cblength,
 234                        char *cbencoding,
 235                        char *cbid,
 236                        void *cbuserdata),
 237                      void (*PreMultiPartCallBack)
 238                       (char *cbname,
 239                        char *cbfilename,
 240                        char *cbpartnum,
 241                        char *cbdisp,
 242                        void *cbcontent,
 243                        char *cbtype,
 244                        char *cbcharset,
 245                        size_t cblength,
 246                        char *cbencoding,
 247                        char *cbid,
 248                        void *cbuserdata),
 249                      void (*PostMultiPartCallBack)
 250                       (char *cbname,
 251                        char *cbfilename,
 252                        char *cbpartnum,
 253                        char *cbdisp,
 254                        void *cbcontent,
 255                        char *cbtype,
 256                        char *cbcharset,
 257                        size_t cblength,
 258                        char *cbencoding,
 259                        char *cbid,
 260                        void *cbuserdata),
 261                       void *userdata,
 262                       int dont_decode
 263 )
 264 {
 265
 266         char *ptr;
 267         char *srch = NULL;
 268         char *part_start, *part_end = NULL;
 269         char buf[SIZ];
 270         char *header;
 271         char *boundary;
 272         char *startary;
 273         size_t startary_len = 0;
 274         char *endary;
 275         char *next_boundary;
 276         char *content_type;
 277         char *charset;
 278         size_t content_length;
 279         char *encoding;
 280         char *disposition;
 281         char *id;
 282         char *name = NULL;
 283         char *content_type_name;
 284         char *content_disposition_name;
 285         char *filename;
 286         int is_multipart;
 287         int part_seq = 0;
 288         int i;
 289         size_t length;
 290         char nested_partnum[256];
 291         int crlf_in_use = 0;
 292         char *evaluate_crlf_ptr = NULL;
 293         int buflen = 0;
 294         int headerlen = 0;
 295
 296         ptr = content_start;
 297         content_length = 0;
 298
 299         boundary = malloc(SIZ);
 300         memset(boundary, 0, SIZ);
 301
 302         startary = malloc(SIZ);
 303         memset(startary, 0, SIZ);
 304
 305         endary = malloc(SIZ);
 306         memset(endary, 0, SIZ);
 307
 308         header = malloc(SIZ);
 309         memset(header, 0, SIZ);
 310
 311         content_type = malloc(SIZ);
 312         memset(content_type, 0, SIZ);
 313
 314         charset = malloc(SIZ);
 315         memset(charset, 0, SIZ);
 316
 317         encoding = malloc(SIZ);
 318         memset(encoding, 0, SIZ);
 319
 320         content_type_name = malloc(SIZ);
 321         memset(content_type_name, 0, SIZ);
 322
 323         content_disposition_name = malloc(SIZ);
 324         memset(content_disposition_name, 0, SIZ);
 325
 326         filename = malloc(SIZ);
 327         memset(filename, 0, SIZ);
 328
 329         disposition = malloc(SIZ);
 330         memset(disposition, 0, SIZ);
 331
 332         id = malloc(SIZ);
 333         memset(id, 0, SIZ);
 334
 335         /* If the caller didn't supply an endpointer, generate one by measure */
 336         if (content_end == NULL) {
 337                 content_end = &content_start[strlen(content_start)];
 338         }
 339
 340         /* Learn interesting things from the headers */
 341         strcpy(header, "");
 342         headerlen = 0;
 343         do {
 344                 ptr = memreadlinelen(ptr, buf, SIZ, &buflen);
 345                 if (ptr >= content_end) {
 346                         goto end_parser;
 347                 }
 348
 349                 for (i = 0; i < buflen; ++i) {
 350                         if (isspace(buf[i])) {
 351                                 buf[i] = ' ';
 352                         }
 353                 }
 354
 355                 if (!isspace(buf[0])) {
 356                         if (!strncasecmp(header, "Content-type:", 13)) {
 357                                 strcpy(content_type, &header[13]);
 358                                 striplt(content_type);
 359                                 extract_key(content_type_name, content_type, "name");
 360                                 extract_key(charset, content_type, "charset");
 361                                 extract_key(boundary, header, "boundary");
 362                                 /* Deal with weird headers */
 363                                 if (strchr(content_type, ' '))
 364                                         *(strchr(content_type, ' ')) = '\0';
 365                                 if (strchr(content_type, ';'))
 366                                         *(strchr(content_type, ';')) = '\0';
 367                         }
 368                         if (!strncasecmp(header, "Content-Disposition:", 20)) {
 369                                 strcpy(disposition, &header[20]);
 370                                 striplt(disposition);
 371                                 extract_key(content_disposition_name, disposition, "name");
 372                                 extract_key(filename, disposition, "filename");
 373                         }
 374                         if (!strncasecmp(header, "Content-ID:", 11)) {
 375                                 strcpy(id, &header[11]);
 376                                 striplt(id);
 377                                 stripallbut(id, '<', '>');
 378                         }
 379                         if (!strncasecmp(header, "Content-length: ", 15)) {
 380                                 char clbuf[10];
 381                                 safestrncpy(clbuf, &header[15], sizeof clbuf);
 382                                 striplt(clbuf);
 383                                 content_length = (size_t) atol(clbuf);
 384                         }
 385                         if (!strncasecmp(header, "Content-transfer-encoding: ", 26)) {
 386                                 strcpy(encoding, &header[26]);
 387                                 striplt(encoding);
 388                         }
 389                         strcpy(header, "");
 390                         headerlen = 0;
 391                 }
 392                 if ((headerlen + buflen + 2) < SIZ) {
 393                         memcpy(&header[headerlen], buf, buflen);
 394                         headerlen += buflen;
 395                         header[headerlen] = '\0';
 396                 }
 397         } while ((!IsEmptyStr(buf)) && (*ptr != 0));
 398
 399         if (strchr(disposition, ';'))
 400                 *(strchr(disposition, ';')) = '\0';
 401         striplt(disposition);
 402         if (strchr(content_type, ';'))
 403                 *(strchr(content_type, ';')) = '\0';
 404         striplt(content_type);
 405
 406         if (!IsEmptyStr(boundary)) {
 407                 is_multipart = 1;
 408         } else {
 409                 is_multipart = 0;
 410         }
 411
 412         /* If this is a multipart message, then recursively process it */
 413         part_start = NULL;
 414         if (is_multipart) {
 415
 416                 /* Tell the client about this message's multipartedness */
 417                 if (PreMultiPartCallBack != NULL) {
 418                         PreMultiPartCallBack("", "", partnum, "",
 419                                 NULL, content_type, charset,
 420                                 0, encoding, id, userdata);
 421                 }
 422
 423                 /* Figure out where the boundaries are */
 424                 snprintf(startary, SIZ, "--%s", boundary);
 425                 snprintf(endary, SIZ, "--%s--", boundary);
 426                 startary_len = strlen(startary);
 427
 428                 part_start = NULL;
 429                 do {
 430                         next_boundary = NULL;
 431                         for (srch=ptr; srch<content_end; ++srch) {
 432                                 if (!memcmp(srch, startary, startary_len)) {
 433                                         next_boundary = srch;
 434                                         srch = content_end;
 435                                 }
 436                         }
 437
 438                         if ( (part_start != NULL) && (next_boundary != NULL) ) {
 439                                 part_end = next_boundary;
 440                                 --part_end;             /* omit the trailing LF */
 441                                 if (crlf_in_use) {
 442                                         --part_end;     /* omit the trailing CR */
 443                                 }
 444
 445                                 if (!IsEmptyStr(partnum)) {
 446                                         snprintf(nested_partnum,
 447                                                  sizeof nested_partnum,
 448                                                  "%s.%d", partnum,
 449                                                  ++part_seq);
 450                                 }
 451                                 else {
 452                                         snprintf(nested_partnum,
 453                                                  sizeof nested_partnum,
 454                                                  "%d", ++part_seq);
 455                                 }
 456                                 the_mime_parser(nested_partnum,
 457                                             part_start, part_end,
 458                                                 CallBack,
 459                                                 PreMultiPartCallBack,
 460                                                 PostMultiPartCallBack,
 461                                                 userdata,
 462                                                 dont_decode);
 463                         }
 464
 465                         if (next_boundary != NULL) {
 466                                 /* If we pass out of scope, don't attempt to
 467                                  * read past the end boundary. */
 468                                 if (!strcmp(next_boundary, endary)) {
 469                                         ptr = content_end;
 470                                 }
 471                                 else {
 472                                         /* Set up for the next part. */
 473                                         part_start = strstr(next_boundary, "\n");
 474
 475                                         /* Determine whether newlines are LF or CRLF */
 476                                         evaluate_crlf_ptr = part_start;
 477                                         --evaluate_crlf_ptr;
 478                                         if (!memcmp(evaluate_crlf_ptr, "\r\n", 2)) {
 479                                                 crlf_in_use = 1;
 480                                         }
 481                                         else {
 482                                                 crlf_in_use = 0;
 483                                         }
 484
 485                                         /* Advance past the LF ... now we're in the next part */
 486                                         ++part_start;
 487                                         ptr = part_start;
 488                                 }
 489                         }
 490                         else {
 491                                 /* Invalid end of multipart.  Bail out! */
 492                                 ptr = content_end;
 493                         }
 494                 } while ( (ptr < content_end) && (next_boundary != NULL) );
 495
 496                 if (PostMultiPartCallBack != NULL) {
 497                         PostMultiPartCallBack("", "", partnum, "", NULL,
 498                                 content_type, charset, 0, encoding, id, userdata);
 499                 }
 500                 goto end_parser;
 501         }
 502
 503         /* If it's not a multipart message, then do something with it */
 504         if (!is_multipart) {
 505                 part_start = ptr;
 506                 length = 0;
 507                 while (ptr < content_end) {
 508                         ++ptr;
 509                         ++length;
 510                 }
 511                 part_end = content_end;
 512
 513
 514                 /* The following code will truncate the MIME part to the size
 515                  * specified by the Content-length: header.   We have commented it
 516                  * out because these headers have a tendency to be wrong.
 517                  *
 518                  *      if ( (content_length > 0) && (length > content_length) ) {
 519                  *              length = content_length;
 520                  *      }
 521                  */
 522
 523                 /* Sometimes the "name" field is tacked on to Content-type,
 524                  * and sometimes it's tacked on to Content-disposition.  Use
 525                  * whichever one we have.
 526                  */
 527                 if (strlen(content_disposition_name) > strlen(content_type_name)) {
 528                         name = content_disposition_name;
 529                 }
 530                 else {
 531                         name = content_type_name;
 532                 }
 533
 534                 /* Ok, we've got a non-multipart part here, so do something with it.
 535                  */
 536                 mime_decode(partnum,
 537                         part_start, length,
 538                         content_type, charset, encoding, disposition, id,
 539                         name, filename,
 540                         CallBack, NULL, NULL,
 541                         userdata, dont_decode
 542                 );
 543
 544                 /*
 545                  * Now if it's an encapsulated message/rfc822 then we have to recurse into it
 546                  */
 547                 if (!strcasecmp(content_type, "message/rfc822")) {
 548
 549                         if (PreMultiPartCallBack != NULL) {
 550                                 PreMultiPartCallBack("", "", partnum, "",
 551                                         NULL, content_type, charset,
 552                                         0, encoding, id, userdata);
 553                         }
 554                         if (CallBack != NULL) {
 555                                 if (strlen(partnum) > 0) {
 556                                         snprintf(nested_partnum,
 557                                                  sizeof nested_partnum,
 558                                                  "%s.%d", partnum,
 559                                                  ++part_seq);
 560                                 }
 561                                 else {
 562                                         snprintf(nested_partnum,
 563                                                  sizeof nested_partnum,
 564                                                  "%d", ++part_seq);
 565                                 }
 566                                 the_mime_parser(nested_partnum,
 567                                         part_start, part_end,
 568                                         CallBack,
 569                                         PreMultiPartCallBack,
 570                                         PostMultiPartCallBack,
 571                                         userdata,
 572                                         dont_decode
 573                                 );
 574                         }
 575                         if (PostMultiPartCallBack != NULL) {
 576                                 PostMultiPartCallBack("", "", partnum, "", NULL,
 577                                         content_type, charset, 0, encoding, id, userdata);
 578                         }
 579
 580
 581                 }
 582
 583         }
 584
 585 end_parser:     /* free the buffers!  end the oppression!! */
 586         free(boundary);
 587         free(startary);
 588         free(endary);
 589         free(header);
 590         free(content_type);
 591         free(charset);
 592         free(encoding);
 593         free(content_type_name);
 594         free(content_disposition_name);
 595         free(filename);
 596         free(disposition);
 597         free(id);
 598 }
 599
 600
 601
 602 /*
 603  * Entry point for the MIME parser.
 604  * (This function expects to be fed HEADERS + CONTENT)
 605  * Note: NULL can be supplied as content_end; in this case, the message is
 606  * considered to have ended when the parser encounters a 0x00 byte.
 607  */
 608 void mime_parser(char *content_start,
 609                 char *content_end,
 610
 611                  void (*CallBack)
 612                   (char *cbname,
 613                    char *cbfilename,
 614                    char *cbpartnum,
 615                    char *cbdisp,
 616                    void *cbcontent,
 617                    char *cbtype,
 618                    char *cbcharset,
 619                    size_t cblength,
 620                    char *cbencoding,
 621                    char *cbid,
 622                    void *cbuserdata),
 623
 624                  void (*PreMultiPartCallBack)
 625                   (char *cbname,
 626                    char *cbfilename,
 627                    char *cbpartnum,
 628                    char *cbdisp,
 629                    void *cbcontent,
 630                    char *cbtype,
 631                    char *cbcharset,
 632                    size_t cblength,
 633                    char *cbencoding,
 634                    char *cbid,
 635                    void *cbuserdata),
 636
 637                  void (*PostMultiPartCallBack)
 638                   (char *cbname,
 639                    char *cbfilename,
 640                    char *cbpartnum,
 641                    char *cbdisp,
 642                    void *cbcontent,
 643                    char *cbtype,
 644                    char *cbcharset,
 645                    size_t cblength,
 646                    char *cbencoding,
 647                    char *cbid,
 648                    void *cbuserdata),
 649
 650                   void *userdata,
 651                   int dont_decode
 652 )
 653 {
 654
 655         the_mime_parser("", content_start, content_end,
 656                         CallBack,
 657                         PreMultiPartCallBack,
 658                         PostMultiPartCallBack,
 659                         userdata, dont_decode);
 660 }
 661
 662
 663
 664
 665
 666
 667 typedef struct _MimeGuess {
 668         const char *Pattern;
 669         size_t PatternLen;
 670         long PatternOffset;
 671         const char *MimeString;
 672 } MimeGuess;
 673
 674 MimeGuess MyMimes [] = {
 675         {
 676                 "GIF",
 677                 3,
 678                 0,
 679                 "image/gif"
 680         },
 681         {
 682                 "\xff\xd8",
 683                 2,
 684                 0,
 685                 "image/jpeg"
 686         },
 687         {
 688                 "\x89PNG",
 689                 4,
 690                 0,
 691                 "image/png"
 692         },
 693         { // last...
 694                 "",
 695                 0,
 696                 0,
 697                 ""
 698         }
 699 };
 700
 701
 702 const char *GuessMimeType(const char *data, size_t dlen)
 703 {
 704         int MimeIndex = 0;
 705
 706         while (MyMimes[MimeIndex].PatternLen != 0)
 707         {
 708                 if ((MyMimes[MimeIndex].PatternLen +
 709                      MyMimes[MimeIndex].PatternOffset < dlen) &&
 710                     strncmp(MyMimes[MimeIndex].Pattern,
 711                             &data[MyMimes[MimeIndex].PatternOffset],
 712                             MyMimes[MimeIndex].PatternLen) == 0)
 713                 {
 714                         return MyMimes[MimeIndex].MimeString;
 715                 }
 716                 MimeIndex ++;
 717         }
 718         /*
 719          * ok, our simple minded algorythm didn't find anything,
 720          * let the big chegger try it, he wil default to application/octet-stream
 721          */
 722         return (xdg_mime_get_mime_type_for_data(data, dlen));
 723 }
 724
 725
 726 const char* GuessMimeByFilename(const char *what, size_t len)
 727 {
 728         /* we know some hardcoded on our own, try them... */
 729         if ((len > 3) && !strncasecmp(&what[len - 4], ".gif", 4))
 730                 return "image/gif";
 731         else if ((len > 2) && !strncasecmp(&what[len - 3], ".js", 3))
 732                 return  "text/javascript";
 733         else if ((len > 3) && !strncasecmp(&what[len - 4], ".txt", 4))
 734                 return "text/plain";
 735         else if ((len > 3) && !strncasecmp(&what[len - 4], ".css", 4))
 736                 return "text/css";
 737         else if ((len > 3) && !strncasecmp(&what[len - 4], ".jpg", 4))
 738                 return "image/jpeg";
 739         else if ((len > 3) && !strncasecmp(&what[len - 4], ".png", 4))
 740                 return "image/png";
 741         else if ((len > 3) && !strncasecmp(&what[len - 4], ".ico", 4))
 742                 return "image/x-icon";
 743         else if ((len > 3) && !strncasecmp(&what[len - 4], ".vcf", 4))
 744                 return "text/x-vcard";
 745         else if ((len > 4) && !strncasecmp(&what[len - 5], ".html", 5))
 746                 return "text/html";
 747         else if ((len > 3) && !strncasecmp(&what[len - 4], ".htm", 4))
 748                 return "text/html";
 749         else if ((len > 3) && !strncasecmp(&what[len - 4], ".wml", 4))
 750                 return "text/vnd.wap.wml";
 751         else if ((len > 4) && !strncasecmp(&what[len - 5], ".wmls", 5))
 752                 return "text/vnd.wap.wmlscript";
 753         else if ((len > 4) && !strncasecmp(&what[len - 5], ".wmlc", 5))
 754                 return "application/vnd.wap.wmlc";
 755         else if ((len > 5) && !strncasecmp(&what[len - 6], ".wmlsc", 6))
 756                 return "application/vnd.wap.wmlscriptc";
 757         else if ((len > 4) && !strncasecmp(&what[len - 5], ".wbmp", 5))
 758                 return "image/vnd.wap.wbmp";
 759         else
 760                 /* and let xdgmime do the fallback. */
 761                 return xdg_mime_get_mime_type_from_file_name(what);
 762 }
 763
 764 static HashList *IconHash = NULL;
 765
 766 typedef struct IconName IconName;
 767
 768 struct IconName {
 769         char *FlatName;
 770         char *FileName;
 771 };
 772
 773 static void DeleteIcon(void *IconNamePtr)
 774 {
 775         IconName *Icon = (IconName*) IconNamePtr;
 776         free(Icon->FlatName);
 777         free(Icon->FileName);
 778         free(Icon);
 779 }
 780
 781 /*
 782 static const char *PrintFlat(void *IconNamePtr)
 783 {
 784         IconName *Icon = (IconName*) IconNamePtr;
 785         return Icon->FlatName;
 786 }
 787 static const char *PrintFile(void *IconNamePtr)
 788 {
 789         IconName *Icon = (IconName*) IconNamePtr;
 790         return Icon->FileName;
 791 }
 792 */
 793
 794 #define GENSTR "x-generic"
 795 #define IGNORE_PREFIX_1 "gnome-mime"
 796 int LoadIconDir(const char *DirName)
 797 {
 798         DIR *filedir = NULL;
 799         struct dirent *filedir_entry;
 800         int d_namelen;
 801         int d_without_ext;
 802         IconName *Icon;
 803
 804         filedir = opendir (DirName);
 805         IconHash = NewHash(1, NULL);
 806         if (filedir == NULL) {
 807                 return 0;
 808         }
 809
 810         while ((filedir_entry = readdir(filedir)))
 811         {
 812                 char *MinorPtr;
 813                 char *PStart;
 814 #ifdef _DIRENT_HAVE_D_NAMELEN
 815                 d_namelen = filedir_entry->d_namelen;
 816 #else
 817                 d_namelen = strlen(filedir_entry->d_name);
 818 #endif
 819                 d_without_ext = d_namelen;
 820                 while ((d_without_ext > 0) && (filedir_entry->d_name[d_without_ext] != '.'))
 821                         d_without_ext --;
 822                 if ((d_without_ext == 0) || (d_namelen < 3))
 823                         continue;
 824
 825                 if ((sizeof(IGNORE_PREFIX_1) < d_namelen) &&
 826                     (strncmp(IGNORE_PREFIX_1,
 827                              filedir_entry->d_name,
 828                              sizeof(IGNORE_PREFIX_1) - 1) == 0)) {
 829                         PStart = filedir_entry->d_name + sizeof(IGNORE_PREFIX_1);
 830                         d_without_ext -= sizeof(IGNORE_PREFIX_1);
 831                 }
 832                 else {
 833                         PStart = filedir_entry->d_name;
 834                 }
 835                 Icon = malloc(sizeof(IconName));
 836
 837                 Icon->FileName = malloc(d_namelen + 1);
 838                 memcpy(Icon->FileName, filedir_entry->d_name, d_namelen + 1);
 839
 840                 Icon->FlatName = malloc(d_without_ext + 1);
 841                 memcpy(Icon->FlatName, PStart, d_without_ext);
 842                 Icon->FlatName[d_without_ext] = '\0';
 843                 /* Try to find Minor type in image-jpeg */
 844                 MinorPtr = strchr(Icon->FlatName, '-');
 845                 if (MinorPtr != NULL) {
 846                         size_t MinorLen;
 847                         MinorLen = 1 + d_without_ext - (MinorPtr - Icon->FlatName + 1);
 848                         if ((MinorLen == sizeof(GENSTR)) &&
 849                             (strncmp(MinorPtr + 1, GENSTR, sizeof(GENSTR)) == 0)) {
 850                                 /* ok, we found a generic filename. cut the generic. */
 851                                 *MinorPtr = '\0';
 852                                 d_without_ext = d_without_ext - (MinorPtr - Icon->FlatName);
 853                         }
 854                         else { /* Map the major / minor separator to / */
 855                                 *MinorPtr = '/';
 856                         }
 857                 }
 858
 859 //              PrintHash(IconHash, PrintFlat, PrintFile);
 860 //              printf("%s - %s\n", Icon->FlatName, Icon->FileName);
 861                 Put(IconHash, Icon->FlatName, d_without_ext, Icon, DeleteIcon);
 862 //              PrintHash(IconHash, PrintFlat, PrintFile);
 863         }
 864         closedir(filedir);
 865         return 1;
 866 }
 867
 868 const char *GetIconFilename(char *MimeType, size_t len)
 869 {
 870         void *vIcon;
 871         IconName *Icon;
 872
 873         if(IconHash == NULL)
 874                 return NULL;
 875
 876         GetHash(IconHash, MimeType, len, &vIcon), Icon = (IconName*) vIcon;
 877         /* didn't find the exact mimetype? try major only. */
 878         if (Icon == NULL) {
 879                 char * pMinor;
 880                 pMinor = strchr(MimeType, '/');
 881                 if (pMinor != NULL) {
 882                         *pMinor = '\0';
 883                         GetHash(IconHash, MimeType, pMinor - MimeType, &vIcon),
 884                                 Icon = (IconName*) vIcon;
 885                 }
 886         }
 887         if (Icon == NULL) {
 888                 return NULL;
 889         }
 890
 891         /*printf("Getting: [%s] == [%s] -> [%s]\n", MimeType, Icon->FlatName, Icon->FileName);*/
 892         return Icon->FileName;
 893 }
 894
 895 void ShutDownLibCitadelMime(void)
 896 {
 897         DeleteHash(&IconHash);
 898 }