xapian-applications/omega/mime.cc

   1 /** @file mime.cc
   2  * @brief Find MIME type for a file
   3  */
   4 /* Copyright 1999,2000,2001 BrightStation PLC
   5  * Copyright 2001,2005 James Aylett
   6  * Copyright 2001,2002 Ananova Ltd
   7  * Copyright 2002,2003,2004,2005,2006,2007,2008,2009,2010,2011,2012,2013,2014,2015 Olly Betts
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
  22  * USA
  23  */
  24
  25 #include <config.h>
  26
  27 #include "mime.h"
  28
  29 #include <algorithm>
  30
  31 #include "keyword.h"
  32 #include "mimemap.h"
  33 #include "stringutils.h"
  34
  35 using namespace std;
  36
  37 // The longest string after a '.' to treat as an extension.  If there's a
  38 // longer entry in the mime_map, we set this to that length instead.
  39 size_t max_ext_len = max(size_t(7), MAX_BUILTIN_MIMEMAP_EXTENSION_LEN);
  40
  41 const char *
  42 built_in_mime_map(const string & ext)
  43 {
  44     int k = keyword(tab, ext.data(), ext.size());
  45     return k >= 0 ? default_mime_map[k] : NULL;
  46 }
  47
  48 string
  49 mimetype_from_ext(const map<string, string> & mime_map, string ext)
  50 {
  51     map<string,string>::const_iterator mt = mime_map.find(ext);
  52     if (mt != mime_map.end())
  53         return mt->second;
  54
  55     const char * r = built_in_mime_map(ext);
  56     if (r) return r;
  57
  58     // The extension wasn't found, see if the lower-cased version (if
  59     // different) is found.
  60     bool changed = false;
  61     string::iterator i;
  62     for (i = ext.begin(); i != ext.end(); ++i) {
  63         if (*i >= 'A' && *i <= 'Z') {
  64             *i = C_tolower(*i);
  65             changed = true;
  66         }
  67     }
  68
  69     if (changed) {
  70         mt = mime_map.find(ext);
  71         if (mt != mime_map.end())
  72             return mt->second;
  73
  74         built_in_mime_map(ext);
  75         if (r) return r;
  76     }
  77
  78     return string();
  79 }