/* -*- c++ -*- */

/*

 * Copyright 2005 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_SKIPHEAD_H

#define INCLUDED_GR_SKIPHEAD_H

#include <gr_core_api.h>

#include <gr_sync_block.h>

#include <stddef.h>      // size_t

class gr_skiphead;

typedef boost::shared_ptr<gr_skiphead> gr_skiphead_sptr;

GR_CORE_API gr_skiphead_sptr

gr_make_skiphead (size_t itemsize, uint64_t nitems_to_skip);

/*!

 * \brief skips the first N items, from then on copies items to the output

 * \ingroup slicedice_blk

 *

 * Useful for building test cases and sources which have metadata or junk at the start

 */

class GR_CORE_API gr_skiphead : public gr_block

{

  friend GR_CORE_API gr_skiphead_sptr gr_make_skiphead (size_t itemsize, uint64_t nitems_to_skip);

  gr_skiphead (size_t itemsize, uint64_t nitems_to_skip);

  uint64_t                  d_nitems_to_skip;

  uint64_t                d_nitems;                // total items seen

 public:

  int general_work(int noutput_items,

                   gr_vector_int &ninput_items,

                   gr_vector_const_void_star &input_items,

                   gr_vector_void_star &output_items);

};

#endif /* INCLUDED_GR_SKIPHEAD_H */