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/* -*- 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 2, 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.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <gr_skiphead.h>
#include <gr_io_signature.h>
gr_skiphead::gr_skiphead (size_t sizeof_stream_item, int nitems)
: gr_sync_block ("skiphead",
gr_make_io_signature (1, 1, sizeof_stream_item),
gr_make_io_signature (1, 1, sizeof_stream_item)),
d_nitems (nitems), d_nskipped_items (0)
{
}
gr_block_sptr
gr_make_skiphead (size_t sizeof_stream_item, int nitems)
{
return gr_block_sptr (new gr_skiphead (sizeof_stream_item, nitems));
}
int
gr_skiphead::work (int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
int items_to_skip = d_nitems - d_nskipped_items;
if (items_to_skip <=0)
{
//Done with skipping, copy all input to the output;
memcpy (output_items[0], input_items[0], noutput_items * input_signature()->sizeof_stream_item (0));
return noutput_items;
} else if (items_to_skip < noutput_items)
{
memcpy (output_items[0], &(((char *)input_items[0])[items_to_skip*input_signature()->sizeof_stream_item (0)]), (noutput_items -items_to_skip) * input_signature()->sizeof_stream_item (0));
//memcpy (output_items[0], &((input_items[0])[items_to_skip]), (noutput_items -items_to_skip) * input_signature()->sizeof_stream_item (0));
//memcpy (output_items[0], input_items[0]+items_to_skip*input_signature()->sizeof_stream_item (0), (noutput_items -items_to_skip) * input_signature()->sizeof_stream_item (0));
d_nskipped_items += items_to_skip;
consume_each (items_to_skip);
return (noutput_items -items_to_skip);
} else
{
d_nskipped_items += noutput_items;
consume_each (items_to_skip);
return 0;
}
return -1;//Should never get here
}
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