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Member "tin-2.6.2/src/mimetypes.c" (9 Dec 2022, 5322 Bytes) of package /linux/misc/tin-2.6.2.tar.xz:

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    1 /*
    2  *  Project   : tin - a Usenet reader
    3  *  Module    : mimetypes.c
    4  *  Author    : J. Faultless
    5  *  Created   : 2000-03-31
    6  *  Updated   : 2022-04-09
    7  *  Notes     : mime.types handling
    8  *
    9  * Copyright (c) 2000-2023 Jason Faultless <jason@altarstone.com>
   10  * All rights reserved.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  *
   16  * 1. Redistributions of source code must retain the above copyright notice,
   17  *    this list of conditions and the following disclaimer.
   18  *
   19  * 2. Redistributions in binary form must reproduce the above copyright
   20  *    notice, this list of conditions and the following disclaimer in the
   21  *    documentation and/or other materials provided with the distribution.
   22  *
   23  * 3. Neither the name of the copyright holder nor the names of its
   24  *    contributors may be used to endorse or promote products derived from
   25  *    this software without specific prior written permission.
   26  *
   27  * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   28  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   30  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
   31  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   37  * POSSIBILITY OF SUCH DAMAGE.
   38  */
   39 
   40 #ifndef TIN_H
   41 #   include "tin.h"
   42 #endif /* !TIN_H */
   43 
   44 
   45 /*
   46  * local prototypes
   47  */
   48 static t_bool _lookup_mimetype(const char *file, const char *ext, t_part *part);
   49 static t_bool _lookup_extension(char *extension, size_t ext_len, const char *file, const char *type);
   50 
   51 
   52 /*
   53  * Match a filename extension to a content-type / subtype pair in mime.types
   54  * Update the passed-in attachment structure with type/subtype if found
   55  * Return TRUE if found
   56  */
   57 static t_bool
   58 _lookup_mimetype(
   59     const char *file,
   60     const char *ext,
   61     t_part *part)
   62 {
   63     FILE *fp;
   64     char *exts;
   65     char *ptr;
   66     char buf[PATH_LEN];
   67     int i;
   68 
   69     if ((fp = fopen(file, "r")) == NULL)
   70         return FALSE;
   71 
   72     while ((fgets(buf, sizeof(buf), fp)) != NULL) {
   73         if (buf[0] == '#' || buf[0] == '\n')        /* Skip comments & blank lines */
   74             continue;
   75 
   76         if (strtok(buf, " \t\n")) {
   77             while ((exts = strtok(NULL, " \t\n")) != NULL) {    /* Work through list of extensions */
   78                 if (strcasecmp(ext, exts) == 0) {
   79                     if ((i = content_type(strtok(buf, "/"))) != -1) {
   80                         if ((ptr = strtok(NULL, "\n")) != NULL) {
   81                             part->type = (unsigned int) i;
   82                             FreeIfNeeded(part->subtype);
   83                             part->subtype = my_strdup(ptr);
   84                             fclose(fp);
   85                             return TRUE;
   86                         }
   87                     }
   88                 }
   89             }
   90         }
   91     }
   92 
   93     fclose(fp);
   94     return FALSE;
   95 }
   96 
   97 
   98 /*
   99  * Check:
  100  *  $HOME/.mime.types
  101  *  /etc/mime.types
  102  *  TIN_DEFAULTS_DIR/mime.types
  103  */
  104 void
  105 lookup_mimetype(
  106     const char *ext,
  107     t_part *part)
  108 {
  109     char buf[PATH_LEN];
  110 
  111     joinpath(buf, sizeof(buf), homedir, ".mime.types");
  112     if (_lookup_mimetype(buf, ext, part))
  113         return;
  114 
  115     if (_lookup_mimetype("/etc/mime.types", ext, part))
  116         return;
  117 
  118 #ifdef TIN_DEFAULTS_DIR
  119     joinpath(buf, sizeof(buf), TIN_DEFAULTS_DIR, "mime.types");
  120     _lookup_mimetype(buf, ext, part);
  121 #endif /* TIN_DEFAULTS_DIR */
  122 }
  123 
  124 
  125 /*
  126  * look for a filename extension in file for the specified
  127  * type ("major/minor"), the result is stored in extension
  128  */
  129 static t_bool
  130 _lookup_extension(
  131     char *extension,
  132     size_t ext_len,
  133     const char *file,
  134     const char *type)
  135 {
  136     FILE *fp;
  137     char *p;
  138     char buf[8192];
  139 
  140     if ((fp = fopen(file, "r")) == NULL)
  141         return FALSE;
  142     while ((fgets(buf, sizeof(buf), fp)) != NULL) {
  143         if (buf[0] == '#' || buf[0] == '\n' || strncmp(buf, type, strlen(type)))
  144             continue;
  145         if ((p = strtok(buf, " \t\n"))) {
  146             if (strlen(p) != strlen(type))
  147                 continue;
  148             if ((p = strtok(NULL, " \t\n")) != NULL) {
  149                 my_strncpy(extension, p, ext_len - 1);
  150                 fclose(fp);
  151                 return TRUE;
  152             }
  153         }
  154     }
  155     fclose(fp);
  156     return FALSE;
  157 }
  158 
  159 
  160 /*
  161  * look for a filename extension for the specified
  162  * major minor, the result is stored in extension
  163  * files checked are:
  164  *  $HOME/.mime.types
  165  *  /etc/mime.types
  166  *  TIN_DEFAULTS_DIR/mime.types
  167  */
  168 t_bool
  169 lookup_extension(
  170     char *extension,
  171     size_t ext_len,
  172     const char *major,
  173     const char *minor)
  174 {
  175     char *type;
  176     char buf[PATH_LEN];
  177 
  178     if (!major || !minor) {
  179         *extension = '\0';
  180         return FALSE;
  181     }
  182 
  183     type = my_malloc(strlen(major) + 1 + strlen(minor) + 1);
  184     strcpy(type, major);
  185     strcat(type, "/");
  186     strcat(type, minor);
  187 
  188     joinpath(buf, sizeof(buf), homedir, ".mime.types");
  189     if (_lookup_extension(extension, ext_len, buf, type)) {
  190         free(type);
  191         return TRUE;
  192     }
  193 
  194     if (_lookup_extension(extension, ext_len, "/etc/mime.types", type)) {
  195         free(type);
  196         return TRUE;
  197     }
  198 
  199 #ifdef TIN_DEFAULTS_DIR
  200     joinpath(buf, sizeof(buf), TIN_DEFAULTS_DIR, "mime.types");
  201     if (_lookup_extension(extension, ext_len, buf, type)) {
  202         free(type);
  203         return TRUE;
  204     }
  205 #endif /* TIN_DEFAULTS_DIR */
  206     free(type);
  207     my_strncpy(extension, minor, ext_len - 1);
  208     return FALSE;
  209 }