file_sink_base.h

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/* -*- c++ -*- */
/*
 * Copyright 2004,2007,2008,2013 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 GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef INCLUDED_GR_FILE_SINK_BASE_H
#define INCLUDED_GR_FILE_SINK_BASE_H

#include <blocks/api.h>
#include <boost/thread.hpp>
#include <cstdio>

namespace gr {
  namespace blocks {

    /*!
     * \brief Common base class for file sinks
     */
    class BLOCKS_API file_sink_base
    {
    protected:
      FILE        *d_fp;        // current FILE pointer
      FILE        *d_new_fp;    // new FILE pointer
      bool         d_updated;   // is there a new FILE pointer?
      bool         d_is_binary;
      boost::mutex d_mutex;
      bool         d_unbuffered;

    protected:
      file_sink_base(const char *filename, bool is_binary);

    public:
      file_sink_base() {}
      ~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();

      /*!
       * \brief turn on unbuffered writes for slower outputs
       */
      void set_unbuffered(bool unbuffered);
    };

  } /* namespace blocks */
} /* namespace gr */

#endif /* INCLUDED_GR_FILE_SINK_BASE_H */