Add xdg mime support on Linux.

base/third_party/xdg_mime/xdgmimecache.h

Index: base/third_party/xdg_mime/xdgmimecache.h
===================================================================
--- base/third_party/xdg_mime/xdgmimecache.h	(revision 0)
+++ base/third_party/xdg_mime/xdgmimecache.h	(revision 0)
@@ -0,0 +1,81 @@
+/* -*- mode: C; c-file-style: "gnu" -*- */
+/* xdgmimecache.h: Private file.  Datastructure for mmapped caches.
+ *
+ * More info can be found at http://www.freedesktop.org/standards/
+ *
+ * Copyright (C) 2005  Matthias Clasen <mclasen@redhat.com>
+ *
+ * Licensed under the Academic Free License version 2.0
+ * Or under the following terms:
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __XDG_MIME_CACHE_H__
+#define __XDG_MIME_CACHE_H__
+
+#include "xdgmime.h"
+
+typedef struct _XdgMimeCache XdgMimeCache;
+
+#ifdef XDG_PREFIX
+#define _xdg_mime_cache_new_from_file                 XDG_RESERVED_ENTRY(cache_new_from_file)
+#define _xdg_mime_cache_ref                           XDG_RESERVED_ENTRY(cache_ref)
+#define _xdg_mime_cache_unref                         XDG_RESERVED_ENTRY(cache_unref)
+#define _xdg_mime_cache_get_max_buffer_extents        XDG_RESERVED_ENTRY(cache_get_max_buffer_extents)
+#define _xdg_mime_cache_get_mime_type_for_data        XDG_RESERVED_ENTRY(cache_get_mime_type_for_data)
+#define _xdg_mime_cache_get_mime_type_for_file        XDG_RESERVED_ENTRY(cache_get_mime_type_for_file)
+#define _xdg_mime_cache_get_mime_type_from_file_name  XDG_RESERVED_ENTRY(cache_get_mime_type_from_file_name)
+#define _xdg_mime_cache_get_mime_types_from_file_name XDG_RESERVED_ENTRY(cache_get_mime_types_from_file_name)
+#define _xdg_mime_cache_list_mime_parents             XDG_RESERVED_ENTRY(cache_list_mime_parents)
+#define _xdg_mime_cache_mime_type_subclass            XDG_RESERVED_ENTRY(cache_mime_type_subclass)
+#define _xdg_mime_cache_unalias_mime_type             XDG_RESERVED_ENTRY(cache_unalias_mime_type)
+#define _xdg_mime_cache_get_icon                      XDG_RESERVED_ENTRY(cache_get_icon)
+#define _xdg_mime_cache_get_generic_icon              XDG_RESERVED_ENTRY(cache_get_generic_icon)
+#define _xdg_mime_cache_glob_dump                     XDG_RESERVED_ENTRY(cache_glob_dump)
+#endif
+
+extern XdgMimeCache **_caches;
+
+XdgMimeCache *_xdg_mime_cache_new_from_file (const char   *file_name);
+XdgMimeCache *_xdg_mime_cache_ref           (XdgMimeCache *cache);
+void          _xdg_mime_cache_unref         (XdgMimeCache *cache);
+
+
+const char  *_xdg_mime_cache_get_mime_type_for_data       (const void *data,
+		 				           size_t      len,
+							   int        *result_prio);
+const char  *_xdg_mime_cache_get_mime_type_for_file       (const char  *file_name,
+							   struct stat *statbuf);
+int          _xdg_mime_cache_get_mime_types_from_file_name (const char *file_name,
+							    const char  *mime_types[],
+							    int          n_mime_types);
+const char  *_xdg_mime_cache_get_mime_type_from_file_name (const char *file_name);
+int          _xdg_mime_cache_is_valid_mime_type           (const char *mime_type);
+int          _xdg_mime_cache_mime_type_equal              (const char *mime_a,
+						           const char *mime_b);
+int          _xdg_mime_cache_media_type_equal             (const char *mime_a,
+							   const char *mime_b);
+int          _xdg_mime_cache_mime_type_subclass           (const char *mime_a,
+							   const char *mime_b);
+char       **_xdg_mime_cache_list_mime_parents		  (const char *mime);
+const char  *_xdg_mime_cache_unalias_mime_type            (const char *mime);
+int          _xdg_mime_cache_get_max_buffer_extents       (void);
+const char  *_xdg_mime_cache_get_icon                     (const char *mime);
+const char  *_xdg_mime_cache_get_generic_icon             (const char *mime);
+void         _xdg_mime_cache_glob_dump                    (void);
+
+#endif /* __XDG_MIME_CACHE_H__ */