+static gchar *
+get_mime_type_from_uri (const gchar *uri, GError **error)
+{
+ GFile *file;
+ GFileInfo *file_info;
+ gchar *mime_type;
+
+ file = g_file_new_for_uri (uri);
+ file_info = g_file_query_info (file,
+ G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE,
+ 0, NULL, error);
+ g_object_unref (file);
+
+ if (file_info == NULL)
+ return NULL;
+
+ mime_type = g_strdup (g_file_info_get_content_type (file_info));
+ g_object_unref (file_info);
+
+ return mime_type;
+}
+
+static gchar *
+get_mime_type_from_data (const gchar *uri, GError **error)
+{
+ GFile *file;
+ GFileInputStream *input_stream;
+ gssize size_read;
+ guchar buffer[1024];
+
+ file = g_file_new_for_uri (uri);
+
+ input_stream = g_file_read (file, NULL, error);
+ if (!input_stream) {
+ g_object_unref (file);
+ return NULL;
+ }
+
+ size_read = g_input_stream_read (G_INPUT_STREAM (input_stream),
+ buffer, 1024, NULL, NULL);
+ g_input_stream_close (G_INPUT_STREAM (input_stream), NULL, error);
+
+ g_object_unref (file);
+
+ if (size_read == -1)
+ return NULL;
+
+ return g_content_type_guess (NULL, /* no filename */
+ buffer, 1024,
+ NULL);
+}
+