--- /dev/null
+/* -*- c++ -*- */
+/*
+ * Copyright 2006 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio 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 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio 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.
+ */
+class gr_file_sink_base
+{
+ protected:
+ gr_file_sink_base(const char *filename, bool is_binary);
+
+ public:
+ ~gr_file_sink_base();
+
+ /*!
+ * \brief Open filename and begin output to it.
+ */
+ bool open(const char *filename);
+
+ /*!
+ * \brief Close current output file.
+ *
+ * Closes current output file and ignores any output until
+ * open is called to connect to another file.
+ */
+ void close();
+
+ /*!
+ * \brief if we've had an update, do it now.
+ */
+ void do_update();
+};