mime.c

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/**
 * @file mime.c
 * @brief MIME (Multipurpose Internet Mail Extensions)
 *
 * @section License
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 * Copyright (C) 2010-2025 Oryx Embedded SARL. All rights reserved.
 *
 * This file is part of CycloneTCP Open.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * @author Oryx Embedded SARL (www.oryx-embedded.com)
 * @version 2.5.4
 **/
 
//Switch to the appropriate trace level
#define TRACE_LEVEL HTTP_TRACE_LEVEL
 
//Dependencies
#include "core/net.h"
#include "http/mime.h"
#include "debug.h"
 
//MIME type list
static const MimeType mimeTypeList[] =
{
   //Custom MIME types
   MIME_CUSTOM_TYPES
 
   //Text MIME types
   {".css",   "text/css"},
   {".csv",   "text/csv"},
   {".htc",   "text/x-component"},
   {".htm",   "text/html"},
   {".html",  "text/html"},
   {".shtm",  "text/html"},
   {".shtml", "text/html"},
   {".stm",   "text/html"},
   {".txt",   "text/plain"},
   {".vcf",   "text/vcard"},
   {".vcard", "text/vcard"},
   {".xml",   "text/xml"},
 
   //Image MIME types
   {".gif",   "image/gif"},
   {".ico",   "image/x-icon"},
   {".jpg",   "image/jpeg"},
   {".jpeg",  "image/jpeg"},
   {".png",   "image/png"},
   {".svg",   "image/svg+xml"},
   {".tif",   "image/tiff"},
 
   //Audio MIME types
   {".aac",   "audio/x-aac"},
   {".aif",   "audio/x-aiff"},
   {".mp3",   "audio/mpeg"},
   {".wav",   "audio/x-wav"},
   {".wma",   "audio/x-ms-wma"},
 
   //Video MIME types
   {".avi",   "video/x-msvideo"},
   {".flv",   "video/x-flv"},
   {".mov",   "video/quicktime"},
   {".mp4",   "video/mp4"},
   {".mpg",   "video/mpeg"},
   {".mpeg",  "video/mpeg"},
   {".wmv",   "video/x-ms-wmv"},
 
   //Application MIME types
   {".doc",   "application/msword"},
   {".gz",    "application/x-gzip"},
   {".gzip",  "application/x-gzip"},
   {".js",    "application/javascript"},
   {".json",  "application/json"},
   {".ogg",   "application/ogg"},
   {".pdf",   "application/pdf"},
   {".ppt",   "application/vnd.ms-powerpoint"},
   {".rar",   "application/x-rar-compressed"},
   {".rtf",   "application/rtf"},
   {".tar",   "application/x-tar"},
   {".tgz",   "application/x-gzip"},
   {".xht",   "application/xhtml+xml"},
   {".xhtml", "application/xhtml+xml"},
   {".xls",   "application/vnd.ms-excel"},
   {".zip",   "application/zip"}
};
 
 
/**
 * @brief Get the MIME type from a given extension
 *
 * This function translates a filename or a file extension into a MIME type
 *
 * @param[in] filename Filename from which to extract the MIME type
 * @return NULL-terminated string containing the associated MIME type
 **/
 
const char_t *mimeGetType(const char_t *filename)
{
   uint_t i;
   uint_t n;
   uint_t m;
 
   //MIME type for unknown extensions
   static const char_t defaultMimeType[] = "application/octet-stream";
 
   //Valid filename?
   if(filename != NULL)
   {
      //Get the length of the specified filename
      n = osStrlen(filename);
 
      //Search the MIME type that matches the specified extension
      for(i = 0; i < arraysize(mimeTypeList); i++)
      {
         //Length of the extension
         m = osStrlen(mimeTypeList[i].extension);
 
         //Check the length of the filename
         if(m <= n)
         {
            //Compare file extensions
            if(osStrcasecmp(filename + n - m, mimeTypeList[i].extension) == 0)
            {
               return mimeTypeList[i].type;
            }
         }
      }
   }
 
   //Return the default MIME type when an unknown extension is encountered
   return defaultMimeType;
}