Nicolas Guillaume
85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
/*
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* Copyright (C) 2025 Nicolas Guillaume <nicol@sguillau.me>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "append_crc32_impl.h"
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#include <gnuradio/block_detail.h>
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#include <gnuradio/io_signature.h>
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#include <boost/bind/bind.hpp>
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#include <boost/crc.hpp>
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#include <cstdint>
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#include <cstring>
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#include <stdexcept>
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#include <vector>
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using namespace gr::ieee802_11;
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append_crc32::sptr append_crc32::make(bool append)
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{
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return gnuradio::get_initial_sptr(new append_crc32_impl(append));
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}
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append_crc32_impl::append_crc32_impl(bool append)
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: block("append_crc32",
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gr::io_signature::make(0, 0, 0),
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gr::io_signature::make(0, 0, 0)),
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d_append(append)
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{
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message_port_register_in(pmt::mp("in"));
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set_msg_handler(pmt::mp("in"), boost::bind(&append_crc32_impl::handle, this, boost::placeholders::_1));
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message_port_register_out(pmt::mp("out"));
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}
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void append_crc32_impl::handle(pmt::pmt_t msg)
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{
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if(pmt::is_eof_object(msg))
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{
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detail().get()->set_done(true);
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return;
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}
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if(!pmt::is_pair(msg))
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throw std::invalid_argument("append_crc32 expects PDU pair");
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pmt::pmt_t meta = pmt::car(msg);
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pmt::pmt_t blob = pmt::cdr(msg);
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if(!pmt::is_blob(blob))
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throw std::invalid_argument("append_crc32 expects blob payload");
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if(!d_append)
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{
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message_port_pub(pmt::mp("out"), pmt::cons(meta, blob));
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return;
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}
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size_t len = pmt::blob_length(blob);
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const uint8_t* data = reinterpret_cast<const uint8_t*>(pmt::blob_data(blob));
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boost::crc_32_type result;
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result.process_bytes(data, len);
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uint32_t crc = result.checksum();
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std::vector<uint8_t> out(len + sizeof(uint32_t));
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std::memcpy(out.data(), data, len);
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std::memcpy(out.data() + len, &crc, sizeof(uint32_t));
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pmt::pmt_t out_blob = pmt::make_blob(out.data(), out.size());
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message_port_pub(pmt::mp("out"), pmt::cons(meta, out_blob));
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}
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