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
  26 void extract_key(char *target, char *source, char *key)
  27 {
  28         char *ptr;
  29         char looking_for[256];
  30         int double_quotes = 0;
  31
  32         snprintf(looking_for, sizeof looking_for, "%s=", key);
  33
  34         ptr = bmstrcasestr(source, looking_for);
  35         if (ptr == NULL) {
  36                 strcpy(target, "");
  37                 return;
  38         }
  39         strcpy(target, (ptr + strlen(looking_for)));
  40
  41         for (ptr=target; (*ptr != 0); ++ptr) {
  42
  43                 /* A semicolon means we've hit the end of the key, unless we're inside double quotes */
  44                 if ( (double_quotes != 1) && (*ptr == ';')) {
  45                         *ptr = 0;
  46                 }
  47
  48                 /* if we find double quotes, we've got a great set of string boundaries */
  49                 if (*ptr == '\"') {
  50                         ++double_quotes;
  51                         if (double_quotes == 1) {
  52                                 strcpy(ptr, ptr+1);
  53                         }
  54                         else {
  55                                 *ptr = 0;
  56                         }
  57                 }
  58         }
  59 }
  60
  61
  62 /*
  63  * For non-multipart messages, we need to generate a quickie partnum of "1"
  64  * to return to callback functions.  Some callbacks demand it.
  65  */
  66 char *fixed_partnum(char *supplied_partnum) {
  67         if (supplied_partnum == NULL) return "1";
  68         if (strlen(supplied_partnum)==0) return "1";
  69         return supplied_partnum;
  70 }
  71
  72
  73
  74 /*
  75  * Convert "quoted-printable" to binary.  Returns number of bytes decoded.
  76  * according to RFC2045 section 6.7
  77  */
  78 int CtdlDecodeQuotedPrintable(char *decoded, char *encoded, int sourcelen) {
  79         unsigned int ch;
  80         int decoded_length = 0;
  81         int pos = 0;
  82
  83         while (pos < sourcelen)
  84         {
  85                 if (!strncmp(&encoded[pos], "=\r\n", 3))
  86                 {
  87                         pos += 3;
  88                 }
  89                 else if (!strncmp(&encoded[pos], "=\n", 2))
  90                 {
  91                         pos += 2;
  92                 }
  93                 else if (encoded[pos] == '=')
  94                 {
  95                         ch = 0;
  96                         sscanf(&encoded[pos+1], "%02x", &ch);
  97                         pos += 3;
  98                         decoded[decoded_length++] = ch;
  99                 }
 100                 else
 101                 {
 102                         decoded[decoded_length++] = encoded[pos];
 103                         pos += 1;
 104                 }
 105         }
 106         decoded[decoded_length] = 0;
 107         return(decoded_length);
 108 }
 109
 110
 111 /*
 112  * Given a message or message-part body and a length, handle any necessary
 113  * decoding and pass the request up the stack.
 114  */
 115 void mime_decode(char *partnum,
 116                  char *part_start, size_t length,
 117                  char *content_type, char *charset, char *encoding,
 118                  char *disposition,
 119                  char *name, char *filename,
 120                  void (*CallBack)
 121                   (char *cbname,
 122                    char *cbfilename,
 123                    char *cbpartnum,
 124                    char *cbdisp,
 125                    void *cbcontent,
 126                    char *cbtype,
 127                    char *cbcharset,
 128                    size_t cblength,
 129                    char *cbencoding,
 130                    void *cbuserdata),
 131                  void (*PreMultiPartCallBack)
 132                   (char *cbname,
 133                    char *cbfilename,
 134                    char *cbpartnum,
 135                    char *cbdisp,
 136                    void *cbcontent,
 137                    char *cbtype,
 138                    char *cbcharset,
 139                    size_t cblength,
 140                    char *cbencoding,
 141                    void *cbuserdata),
 142                  void (*PostMultiPartCallBack)
 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                    void *cbuserdata),
 153                   void *userdata,
 154                   int dont_decode
 155 )
 156 {
 157
 158         char *decoded;
 159         size_t bytes_decoded = 0;
 160
 161         /* Some encodings aren't really encodings */
 162         if (!strcasecmp(encoding, "7bit"))
 163                 strcpy(encoding, "");
 164         if (!strcasecmp(encoding, "8bit"))
 165                 strcpy(encoding, "");
 166         if (!strcasecmp(encoding, "binary"))
 167                 strcpy(encoding, "");
 168
 169         /* If this part is not encoded, send as-is */
 170         if ( (strlen(encoding) == 0) || (dont_decode)) {
 171                 if (CallBack != NULL) {
 172                         CallBack(name, filename, fixed_partnum(partnum),
 173                                 disposition, part_start,
 174                                 content_type, charset, length, encoding, userdata);
 175                         }
 176                 return;
 177         }
 178
 179         /* Fail silently if we hit an unknown encoding. */
 180         if ((strcasecmp(encoding, "base64"))
 181             && (strcasecmp(encoding, "quoted-printable"))) {
 182                 return;
 183         }
 184
 185         /*
 186          * Allocate a buffer for the decoded data.  The output buffer is slightly
 187          * larger than the input buffer; this assumes that the decoded data
 188          * will never be significantly larger than the encoded data.  This is a
 189          * safe assumption with base64, uuencode, and quoted-printable.
 190          */
 191         decoded = malloc(length + 32768);
 192         if (decoded == NULL) {
 193                 return;
 194         }
 195
 196         if (!strcasecmp(encoding, "base64")) {
 197                 bytes_decoded = CtdlDecodeBase64(decoded, part_start, length);
 198         }
 199         else if (!strcasecmp(encoding, "quoted-printable")) {
 200                 bytes_decoded = CtdlDecodeQuotedPrintable(decoded, part_start, length);
 201         }
 202
 203         if (bytes_decoded > 0) if (CallBack != NULL) {
 204                 CallBack(name, filename, fixed_partnum(partnum),
 205                         disposition, decoded,
 206                         content_type, charset, bytes_decoded, "binary", userdata);
 207         }
 208
 209         free(decoded);
 210 }
 211
 212 /*
 213  * Break out the components of a multipart message
 214  * (This function expects to be fed HEADERS + CONTENT)
 215  * Note: NULL can be supplied as content_end; in this case, the message is
 216  * considered to have ended when the parser encounters a 0x00 byte.
 217  */
 218 void the_mime_parser(char *partnum,
 219                      char *content_start, char *content_end,
 220                      void (*CallBack)
 221                       (char *cbname,
 222                        char *cbfilename,
 223                        char *cbpartnum,
 224                        char *cbdisp,
 225                        void *cbcontent,
 226                        char *cbtype,
 227                        char *cbcharset,
 228                        size_t cblength,
 229                        char *cbencoding,
 230                        void *cbuserdata),
 231                      void (*PreMultiPartCallBack)
 232                       (char *cbname,
 233                        char *cbfilename,
 234                        char *cbpartnum,
 235                        char *cbdisp,
 236                        void *cbcontent,
 237                        char *cbtype,
 238                        char *cbcharset,
 239                        size_t cblength,
 240                        char *cbencoding,
 241                        void *cbuserdata),
 242                      void (*PostMultiPartCallBack)
 243                       (char *cbname,
 244                        char *cbfilename,
 245                        char *cbpartnum,
 246                        char *cbdisp,
 247                        void *cbcontent,
 248                        char *cbtype,
 249                        char *cbcharset,
 250                        size_t cblength,
 251                        char *cbencoding,
 252                        void *cbuserdata),
 253                       void *userdata,
 254                       int dont_decode
 255 )
 256 {
 257
 258         char *ptr;
 259         char *srch = NULL;
 260         char *part_start, *part_end = NULL;
 261         char buf[SIZ];
 262         char *header;
 263         char *boundary;
 264         char *startary;
 265         size_t startary_len = 0;
 266         char *endary;
 267         char *next_boundary;
 268         char *content_type;
 269         char *charset;
 270         size_t content_length;
 271         char *encoding;
 272         char *disposition;
 273         char *name = NULL;
 274         char *content_type_name;
 275         char *content_disposition_name;
 276         char *filename;
 277         int is_multipart;
 278         int part_seq = 0;
 279         int i;
 280         size_t length;
 281         char nested_partnum[256];
 282         int crlf_in_use = 0;
 283         char *evaluate_crlf_ptr = NULL;
 284         int buflen = 0;
 285         int headerlen = 0;
 286
 287         ptr = content_start;
 288         content_length = 0;
 289
 290         boundary = malloc(SIZ);
 291         memset(boundary, 0, SIZ);
 292
 293         startary = malloc(SIZ);
 294         memset(startary, 0, SIZ);
 295
 296         endary = malloc(SIZ);
 297         memset(endary, 0, SIZ);
 298
 299         header = malloc(SIZ);
 300         memset(header, 0, SIZ);
 301
 302         content_type = malloc(SIZ);
 303         memset(content_type, 0, SIZ);
 304
 305         charset = malloc(SIZ);
 306         memset(charset, 0, SIZ);
 307
 308         encoding = malloc(SIZ);
 309         memset(encoding, 0, SIZ);
 310
 311         content_type_name = malloc(SIZ);
 312         memset(content_type_name, 0, SIZ);
 313
 314         content_disposition_name = malloc(SIZ);
 315         memset(content_disposition_name, 0, SIZ);
 316
 317         filename = malloc(SIZ);
 318         memset(filename, 0, SIZ);
 319
 320         disposition = malloc(SIZ);
 321         memset(disposition, 0, SIZ);
 322
 323         /* If the caller didn't supply an endpointer, generate one by measure */
 324         if (content_end == NULL) {
 325                 content_end = &content_start[strlen(content_start)];
 326         }
 327
 328         /* Learn interesting things from the headers */
 329         strcpy(header, "");
 330         headerlen = 0;
 331         do {
 332                 ptr = memreadlinelen(ptr, buf, SIZ, &buflen);
 333                 if (ptr >= content_end) {
 334                         goto end_parser;
 335                 }
 336
 337                 for (i = 0; i < buflen; ++i) {
 338                         if (isspace(buf[i])) {
 339                                 buf[i] = ' ';
 340                         }
 341                 }
 342
 343                 if (!isspace(buf[0])) {
 344                         if (!strncasecmp(header, "Content-type:", 13)) {
 345                                 strcpy(content_type, &header[13]);
 346                                 striplt(content_type);
 347                                 extract_key(content_type_name, content_type, "name");
 348                                 extract_key(charset, content_type, "charset");
 349                                 extract_key(boundary, header, "boundary");
 350                                 /* Deal with weird headers */
 351                                 if (strchr(content_type, ' '))
 352                                         *(strchr(content_type, ' ')) = '\0';
 353                                 if (strchr(content_type, ';'))
 354                                         *(strchr(content_type, ';')) = '\0';
 355                         }
 356                         if (!strncasecmp(header, "Content-Disposition:", 20)) {
 357                                 strcpy(disposition, &header[20]);
 358                                 striplt(disposition);
 359                                 extract_key(content_disposition_name, disposition, "name");
 360                                 extract_key(filename, disposition, "filename");
 361                         }
 362                         if (!strncasecmp(header, "Content-length: ", 15)) {
 363                                 char clbuf[10];
 364                                 safestrncpy(clbuf, &header[15], sizeof clbuf);
 365                                 striplt(clbuf);
 366                                 content_length = (size_t) atol(clbuf);
 367                         }
 368                         if (!strncasecmp(header, "Content-transfer-encoding: ", 26)) {
 369                                 strcpy(encoding, &header[26]);
 370                                 striplt(encoding);
 371                         }
 372                         strcpy(header, "");
 373                         headerlen = 0;
 374                 }
 375                 if ((headerlen + buflen + 2) < SIZ) {
 376                         memcpy(&header[headerlen], buf, buflen);
 377                         headerlen += buflen;
 378                         header[headerlen] = '\0';
 379                 }
 380         } while ((!IsEmptyStr(buf)) && (*ptr != 0));
 381
 382         if (strchr(disposition, ';'))
 383                 *(strchr(disposition, ';')) = '\0';
 384         striplt(disposition);
 385         if (strchr(content_type, ';'))
 386                 *(strchr(content_type, ';')) = '\0';
 387         striplt(content_type);
 388
 389         if (!IsEmptyStr(boundary)) {
 390                 is_multipart = 1;
 391         } else {
 392                 is_multipart = 0;
 393         }
 394
 395         /* If this is a multipart message, then recursively process it */
 396         part_start = NULL;
 397         if (is_multipart) {
 398
 399                 /* Tell the client about this message's multipartedness */
 400                 if (PreMultiPartCallBack != NULL) {
 401                         PreMultiPartCallBack("", "", partnum, "",
 402                                 NULL, content_type, charset,
 403                                 0, encoding, userdata);
 404                 }
 405
 406                 /* Figure out where the boundaries are */
 407                 snprintf(startary, SIZ, "--%s", boundary);
 408                 snprintf(endary, SIZ, "--%s--", boundary);
 409                 startary_len = strlen(startary);
 410
 411                 part_start = NULL;
 412                 do {
 413                         next_boundary = NULL;
 414                         for (srch=ptr; srch<content_end; ++srch) {
 415                                 if (!memcmp(srch, startary, startary_len)) {
 416                                         next_boundary = srch;
 417                                         srch = content_end;
 418                                 }
 419                         }
 420
 421                         if ( (part_start != NULL) && (next_boundary != NULL) ) {
 422                                 part_end = next_boundary;
 423                                 --part_end;             /* omit the trailing LF */
 424                                 if (crlf_in_use) {
 425                                         --part_end;     /* omit the trailing CR */
 426                                 }
 427
 428                                 if (!IsEmptyStr(partnum)) {
 429                                         snprintf(nested_partnum,
 430                                                  sizeof nested_partnum,
 431                                                  "%s.%d", partnum,
 432                                                  ++part_seq);
 433                                 }
 434                                 else {
 435                                         snprintf(nested_partnum,
 436                                                  sizeof nested_partnum,
 437                                                  "%d", ++part_seq);
 438                                 }
 439                                 the_mime_parser(nested_partnum,
 440                                             part_start, part_end,
 441                                                 CallBack,
 442                                                 PreMultiPartCallBack,
 443                                                 PostMultiPartCallBack,
 444                                                 userdata,
 445                                                 dont_decode);
 446                         }
 447
 448                         if (next_boundary != NULL) {
 449                                 /* If we pass out of scope, don't attempt to
 450                                  * read past the end boundary. */
 451                                 if (!strcmp(next_boundary, endary)) {
 452                                         ptr = content_end;
 453                                 }
 454                                 else {
 455                                         /* Set up for the next part. */
 456                                         part_start = strstr(next_boundary, "\n");
 457
 458                                         /* Determine whether newlines are LF or CRLF */
 459                                         evaluate_crlf_ptr = part_start;
 460                                         --evaluate_crlf_ptr;
 461                                         if (!memcmp(evaluate_crlf_ptr, "\r\n", 2)) {
 462                                                 crlf_in_use = 1;
 463                                         }
 464                                         else {
 465                                                 crlf_in_use = 0;
 466                                         }
 467
 468                                         /* Advance past the LF ... now we're in the next part */
 469                                         ++part_start;
 470                                         ptr = part_start;
 471                                 }
 472                         }
 473                         else {
 474                                 /* Invalid end of multipart.  Bail out! */
 475                                 ptr = content_end;
 476                         }
 477                 } while ( (ptr < content_end) && (next_boundary != NULL) );
 478
 479                 if (PostMultiPartCallBack != NULL) {
 480                         PostMultiPartCallBack("", "", partnum, "", NULL,
 481                                 content_type, charset, 0, encoding, userdata);
 482                 }
 483                 goto end_parser;
 484         }
 485
 486         /* If it's not a multipart message, then do something with it */
 487         if (!is_multipart) {
 488                 part_start = ptr;
 489                 length = 0;
 490                 while (ptr < content_end) {
 491                         ++ptr;
 492                         ++length;
 493                 }
 494                 part_end = content_end;
 495
 496                 /******
 497                  * I thought there was an off-by-one error here, but there isn't.
 498                  * This probably means that there's an off-by-one error somewhere
 499                  * else ... or maybe only in certain messages?
 500                 --part_end;
 501                 --length;
 502                 ******/
 503
 504                 /* Truncate if the header told us to */
 505                 if ( (content_length > 0) && (length > content_length) ) {
 506                         length = content_length;
 507                 }
 508
 509                 /* Sometimes the "name" field is tacked on to Content-type,
 510                  * and sometimes it's tacked on to Content-disposition.  Use
 511                  * whichever one we have.
 512                  */
 513                 if (strlen(content_disposition_name) > strlen(content_type_name)) {
 514                         name = content_disposition_name;
 515                 }
 516                 else {
 517                         name = content_type_name;
 518                 }
 519
 520                 /* Ok, we've got a non-multipart part here, so do something with it.
 521                  */
 522                 mime_decode(partnum,
 523                         part_start, length,
 524                         content_type, charset, encoding, disposition,
 525                         name, filename,
 526                         CallBack, NULL, NULL,
 527                         userdata, dont_decode
 528                 );
 529
 530                 /*
 531                  * Now if it's an encapsulated message/rfc822 then we have to recurse into it
 532                  */
 533                 if (!strcasecmp(content_type, "message/rfc822")) {
 534
 535                         if (PreMultiPartCallBack != NULL) {
 536                                 PreMultiPartCallBack("", "", partnum, "",
 537                                         NULL, content_type, charset,
 538                                         0, encoding, userdata);
 539                         }
 540                         if (CallBack != NULL) {
 541                                 if (strlen(partnum) > 0) {
 542                                         snprintf(nested_partnum,
 543                                                  sizeof nested_partnum,
 544                                                  "%s.%d", partnum,
 545                                                  ++part_seq);
 546                                 }
 547                                 else {
 548                                         snprintf(nested_partnum,
 549                                                  sizeof nested_partnum,
 550                                                  "%d", ++part_seq);
 551                                 }
 552                                 the_mime_parser(nested_partnum,
 553                                         part_start, part_end,
 554                                         CallBack,
 555                                         PreMultiPartCallBack,
 556                                         PostMultiPartCallBack,
 557                                         userdata,
 558                                         dont_decode
 559                                 );
 560                         }
 561                         if (PostMultiPartCallBack != NULL) {
 562                                 PostMultiPartCallBack("", "", partnum, "", NULL,
 563                                         content_type, charset, 0, encoding, userdata);
 564                         }
 565
 566
 567                 }
 568
 569         }
 570
 571 end_parser:     /* free the buffers!  end the oppression!! */
 572         free(boundary);
 573         free(startary);
 574         free(endary);
 575         free(header);
 576         free(content_type);
 577         free(charset);
 578         free(encoding);
 579         free(content_type_name);
 580         free(content_disposition_name);
 581         free(filename);
 582         free(disposition);
 583 }
 584
 585
 586
 587 /*
 588  * Entry point for the MIME parser.
 589  * (This function expects to be fed HEADERS + CONTENT)
 590  * Note: NULL can be supplied as content_end; in this case, the message is
 591  * considered to have ended when the parser encounters a 0x00 byte.
 592  */
 593 void mime_parser(char *content_start,
 594                 char *content_end,
 595
 596                  void (*CallBack)
 597                   (char *cbname,
 598                    char *cbfilename,
 599                    char *cbpartnum,
 600                    char *cbdisp,
 601                    void *cbcontent,
 602                    char *cbtype,
 603                    char *cbcharset,
 604                    size_t cblength,
 605                    char *cbencoding,
 606                    void *cbuserdata),
 607
 608                  void (*PreMultiPartCallBack)
 609                   (char *cbname,
 610                    char *cbfilename,
 611                    char *cbpartnum,
 612                    char *cbdisp,
 613                    void *cbcontent,
 614                    char *cbtype,
 615                    char *cbcharset,
 616                    size_t cblength,
 617                    char *cbencoding,
 618                    void *cbuserdata),
 619
 620                  void (*PostMultiPartCallBack)
 621                   (char *cbname,
 622                    char *cbfilename,
 623                    char *cbpartnum,
 624                    char *cbdisp,
 625                    void *cbcontent,
 626                    char *cbtype,
 627                    char *cbcharset,
 628                    size_t cblength,
 629                    char *cbencoding,
 630                    void *cbuserdata),
 631
 632                   void *userdata,
 633                   int dont_decode
 634 )
 635 {
 636
 637         the_mime_parser("", content_start, content_end,
 638                         CallBack,
 639                         PreMultiPartCallBack,
 640                         PostMultiPartCallBack,
 641                         userdata, dont_decode);
 642 }
 643
 644
 645
 646
 647
 648
 649 typedef struct _MimeGuess {
 650         const char *Pattern;
 651         size_t PatternLen;
 652         long PatternOffset;
 653         const char *MimeString;
 654 } MimeGuess;
 655
 656 MimeGuess MyMimes [] = {
 657         {
 658                 "GIF",
 659                 3,
 660                 0,
 661                 "image/gif"
 662         },
 663         {
 664                 "\xff\xd8",
 665                 2,
 666                 0,
 667                 "image/jpeg"
 668         },
 669         {
 670                 "\x89PNG",
 671                 4,
 672                 0,
 673                 "image/png"
 674         },
 675         { // last...
 676                 "",
 677                 0,
 678                 0,
 679                 ""
 680         }
 681 };
 682
 683
 684 const char *GuessMimeType(char *data, size_t dlen)
 685 {
 686         int MimeIndex = 0;
 687
 688         while (MyMimes[MimeIndex].PatternLen != 0)
 689         {
 690                 if ((MyMimes[MimeIndex].PatternLen +
 691                      MyMimes[MimeIndex].PatternOffset < dlen) &&
 692                     strncmp(MyMimes[MimeIndex].Pattern,
 693                             &data[MyMimes[MimeIndex].PatternOffset],
 694                             MyMimes[MimeIndex].PatternLen) == 0)
 695                 {
 696                         return MyMimes[MimeIndex].MimeString;
 697                 }
 698                 MimeIndex ++;
 699         }
 700         /*
 701          * ok, our simple minded algorythm didn't find anything,
 702          * let the big chegger try it, he wil default to application/octet-stream
 703          */
 704         return (xdg_mime_get_mime_type_for_data(data, dlen));
 705 }
 706
 707
 708 const char* GuessMimeByFilename(const char *what, size_t len)
 709 {
 710         /* we know some hardcoded on our own, try them... */
 711         if (!strncasecmp(&what[len - 4], ".gif", 4))
 712                 return "image/gif";
 713         else if (!strncasecmp(&what[len - 3], ".js", 3))
 714                 return  "text/javascript";
 715         else if (!strncasecmp(&what[len - 4], ".txt", 4))
 716                 return "text/plain";
 717         else if (!strncasecmp(&what[len - 4], ".css", 4))
 718                 return "text/css";
 719         else if (!strncasecmp(&what[len - 4], ".jpg", 4))
 720                 return "image/jpeg";
 721         else if (!strncasecmp(&what[len - 4], ".png", 4))
 722                 return "image/png";
 723         else if (!strncasecmp(&what[len - 4], ".ico", 4))
 724                 return "image/x-icon";
 725         else if (!strncasecmp(&what[len - 5], ".html", 5))
 726                 return "text/html";
 727         else if (!strncasecmp(&what[len - 4], ".htm", 4))
 728                 return "text/html";
 729         else if (!strncasecmp(&what[len - 4], ".wml", 4))
 730                 return "text/vnd.wap.wml";
 731         else if (!strncasecmp(&what[len - 5], ".wmls", 5))
 732                 return "text/vnd.wap.wmlscript";
 733         else if (!strncasecmp(&what[len - 5], ".wmlc", 5))
 734                 return "application/vnd.wap.wmlc";
 735         else if (!strncasecmp(&what[len - 6], ".wmlsc", 6))
 736                 return "application/vnd.wap.wmlscriptc";
 737         else if (!strncasecmp(&what[len - 5], ".wbmp", 5))
 738                 return "image/vnd.wap.wbmp";
 739         else
 740                 /* and let xdgmime do the fallback. */
 741                 return xdg_mime_get_mime_type_from_file_name(what);
 742 }
 743
 744 static HashList *IconHash = NULL;
 745
 746 typedef struct IconName IconName;
 747
 748 struct IconName {
 749         char *FlatName;
 750         char *FileName;
 751 };
 752
 753 static void DeleteIcon(void *IconNamePtr)
 754 {
 755         IconName *Icon = (IconName*) IconNamePtr;
 756         free(Icon->FlatName);
 757         free(Icon->FileName);
 758 }
 759
 760 static const char *PrintFlat(void *IconNamePtr)
 761 {
 762         IconName *Icon = (IconName*) IconNamePtr;
 763         return Icon->FlatName;
 764 }
 765 static const char *PrintFile(void *IconNamePtr)
 766 {
 767         IconName *Icon = (IconName*) IconNamePtr;
 768         return Icon->FileName;
 769 }
 770 #define GENSTR "x-generic"
 771 #define IGNORE_PREFIX_1 "gnome-mime"
 772 int LoadIconDir(const char *DirName)
 773 {
 774         DIR *filedir = NULL;
 775         struct dirent *filedir_entry;
 776         int d_namelen;
 777         int d_without_ext;
 778         IconName *Icon;
 779
 780         filedir = opendir (DirName);
 781         IconHash = NewHash();
 782         if (filedir == NULL) {
 783                 return 0;
 784         }
 785
 786         while ((filedir_entry = readdir(filedir)))
 787         {
 788                 char *MinorPtr;
 789                 char *PStart;
 790 #ifdef _DIRENT_HAVE_D_NAMELEN
 791                 d_namelen = filedir_entry->d_namelen;
 792 #else
 793                 d_namelen = strlen(filedir_entry->d_name);
 794 #endif
 795                 d_without_ext = d_namelen;
 796                 while ((d_without_ext > 0) && (filedir_entry->d_name[d_without_ext] != '.'))
 797                         d_without_ext --;
 798                 if ((d_without_ext == 0) || (d_namelen < 3))
 799                         continue;
 800
 801                 if ((sizeof(IGNORE_PREFIX_1) < d_namelen) &&
 802                     (strncmp(IGNORE_PREFIX_1,
 803                              filedir_entry->d_name,
 804                              sizeof(IGNORE_PREFIX_1) - 1) == 0)) {
 805                         PStart = filedir_entry->d_name + sizeof(IGNORE_PREFIX_1);
 806                         d_without_ext -= sizeof(IGNORE_PREFIX_1);
 807                 }
 808                 else {
 809                         PStart = filedir_entry->d_name;
 810                 }
 811                 Icon = malloc(sizeof(IconName));
 812
 813                 Icon->FileName = malloc(d_namelen + 1);
 814                 memcpy(Icon->FileName, filedir_entry->d_name, d_namelen + 1);
 815
 816                 Icon->FlatName = malloc(d_without_ext + 1);
 817                 memcpy(Icon->FlatName, PStart, d_without_ext);
 818                 Icon->FlatName[d_without_ext] = '\0';
 819                 /* Try to find Minor type in image-jpeg */
 820                 MinorPtr = strchr(Icon->FlatName, '-');
 821                 if (MinorPtr != NULL) {
 822                         size_t MinorLen;
 823                         MinorLen = 1 + d_without_ext - (MinorPtr - Icon->FlatName + 1);
 824                         if ((MinorLen == sizeof(GENSTR)) &&
 825                             (strncmp(MinorPtr + 1, GENSTR, sizeof(GENSTR)) == 0)) {
 826                                 /* ok, we found a generic filename. cut the generic. */
 827                                 *MinorPtr = '\0';
 828                                 d_without_ext = d_without_ext - (MinorPtr - Icon->FlatName);
 829                         }
 830                         else { /* Map the major / minor separator to / */
 831                                 *MinorPtr = '/';
 832                         }
 833                 }
 834
 835 //              PrintHash(IconHash, PrintFlat, PrintFile);
 836 //              printf("%s - %s\n", Icon->FlatName, Icon->FileName);
 837                 Put(IconHash, Icon->FlatName, d_without_ext, Icon, DeleteIcon);
 838 //              PrintHash(IconHash, PrintFlat, PrintFile);
 839         }
 840         return 1;
 841 }
 842
 843 const char *GetIconFilename(char *MimeType, size_t len)
 844 {
 845         IconName *Icon;
 846
 847         if(IconHash == NULL)
 848                 return NULL;
 849
 850         GetHash(IconHash, MimeType, len, (void**)&Icon);
 851         /* didn't find the exact mimetype? try major only. */
 852         if (Icon == NULL) {
 853                 char * pMinor;
 854                 pMinor = strchr(MimeType, '/');
 855                 if (pMinor != NULL) {
 856                         *pMinor = '\0';
 857                         GetHash(IconHash, MimeType, pMinor - MimeType, (void**)&Icon);
 858                 }
 859         }
 860         if (Icon == NULL) {
 861                 return NULL;
 862         }
 863
 864         /*printf("Getting: [%s] == [%s] -> [%s]\n", MimeType, Icon->FlatName, Icon->FileName);*/
 865         return Icon->FileName;
 866 }
 867
 868 void ShutDownLibCitadel(void)
 869 {
 870         DeleteHash(&IconHash);
 871 }