Add xdg mime support on Linux.

base/third_party/xdg_mime/xdgmimemagic.h

+/* -*- mode: C; c-file-style: "gnu" -*- */
+/* xdgmimemagic.h: Private file.  Datastructure for storing the magic files.
+ *
+ * More info can be found at http://www.freedesktop.org/standards/
+ *
+ * Copyright (C) 2003  Red Hat, Inc.
+ * Copyright (C) 2003  Jonathan Blandford <jrb@alum.mit.edu>
+ *
+ * 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_MAGIC_H__
+#define __XDG_MIME_MAGIC_H__
+
+#include <unistd.h>
+#include "xdgmime.h"
+typedef struct XdgMimeMagic XdgMimeMagic;
+
+#ifdef XDG_PREFIX
+#define _xdg_mime_glob_read_from_file             XDG_RESERVED_ENTRY(glob_read_from_file)
+#define _xdg_mime_magic_new                       XDG_RESERVED_ENTRY(magic_new)
+#define _xdg_mime_magic_read_from_file            XDG_RESERVED_ENTRY(magic_read_from_file)
+#define _xdg_mime_magic_free                      XDG_RESERVED_ENTRY(magic_free)
+#define _xdg_mime_magic_get_buffer_extents        XDG_RESERVED_ENTRY(magic_get_buffer_extents)
+#define _xdg_mime_magic_lookup_data               XDG_RESERVED_ENTRY(magic_lookup_data)
+#endif
+
+
+XdgMimeMagic *_xdg_mime_magic_new                (void);
+void          _xdg_mime_magic_read_from_file     (XdgMimeMagic *mime_magic,
+                                                  const char   *file_name);
+void          _xdg_mime_magic_free               (XdgMimeMagic *mime_magic);
+int           _xdg_mime_magic_get_buffer_extents (XdgMimeMagic *mime_magic);
+const char   *_xdg_mime_magic_lookup_data        (XdgMimeMagic *mime_magic,
+                                                  const void   *data,
+                                                  size_t        len,
+                                                  int          *result_prio,
+                                                  const char   *mime_types[],
+                                                  int           n_mime_types);
+
+#endif /* __XDG_MIME_MAGIC_H__ */