diff options
| author | Tom Rondeau <trondeau@vt.edu> | 2013-03-17 11:43:10 -0400 |
|---|---|---|
| committer | Tom Rondeau <trondeau@vt.edu> | 2013-03-17 11:43:10 -0400 |
| commit | ee2b700f72503d6e7f62adbfb7dff9997b9cb003 (patch) | |
| tree | 2c7e91d03fb5c605c6deebac9077c1bc41bce13d /gr-blocks/lib/head_impl.cc | |
| parent | f15400470ce5cb68f5339ead7af726b8bbafd364 (diff) | |
| parent | 65d88f0b28e233c82bc4f0c07072085a3d18c163 (diff) | |
Merge branch 'master' into next
Conflicts:
gr-blocks/swig/blocks_swig.i
Diffstat (limited to 'gr-blocks/lib/head_impl.cc')
| -rw-r--r-- | gr-blocks/lib/head_impl.cc | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/gr-blocks/lib/head_impl.cc b/gr-blocks/lib/head_impl.cc new file mode 100644 index 0000000000..7dfa36607c --- /dev/null +++ b/gr-blocks/lib/head_impl.cc @@ -0,0 +1,75 @@ +/* -*- c++ -*- */ +/* + * Copyright 2004,2009,2013 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. + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include "head_impl.h" +#include <gr_io_signature.h> +#include <string.h> + +namespace gr { + namespace blocks { + + head::sptr + head::make(size_t sizeof_stream_item, uint64_t nitems) + { + return gnuradio::get_initial_sptr + (new head_impl(sizeof_stream_item, nitems)); + } + + head_impl::head_impl(size_t sizeof_stream_item, uint64_t nitems) + : gr_sync_block("head", + gr_make_io_signature(1, 1, sizeof_stream_item), + gr_make_io_signature(1, 1, sizeof_stream_item)), + d_nitems(nitems), d_ncopied_items(0) + { + } + + head_impl::~head_impl() + { + } + + int + head_impl::work(int noutput_items, + gr_vector_const_void_star &input_items, + gr_vector_void_star &output_items) + { + if(d_ncopied_items >= d_nitems) + return -1; // Done! + + unsigned n = std::min(d_nitems - d_ncopied_items, + (uint64_t)noutput_items); + + if(n == 0) + return 0; + + memcpy(output_items[0], input_items[0], + n * input_signature()->sizeof_stream_item (0)); + d_ncopied_items += n; + + return n; + } + + } /* namespace blocks */ +} /* namespace gr */ |