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/* -*- c++ -*- */
/*
* Copyright 2017 by Moritz Luca Schmid, Communications Engineering Lab (CEL) / Karlsruhe Institute of Technology (KIT).
*
* This 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.
*
* This software 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 this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDED_DAB_CRC16_BB_IMPL_H
#define INCLUDED_DAB_CRC16_BB_IMPL_H
#include <grdab/crc16_bb.h>
namespace gr {
namespace dab {
/*! \brief crc16 is written in the last 2 bits of input vector
*
* input: char vector of length length (packed bytes)
*
* output: char vector of length length (packed bytes) with crc at last 2 bytes (overwrites last 2 bytes)
*
* uses the crc16 function to calculate a 2 byte crc word and write it to the FIB (overwrites last 2 bytes)
*
* @param length Length of input and output vector in bytes. (default is 32 for DAB FIBs)
* @param generator Generator polynom for shift register. (default is 0x1021 for DAB)
* @param initial_state Initial state of shift register. (default is 0xffff for DAB)
*/
class crc16_bb_impl : public crc16_bb {
private:
uint16_t d_crc;
int d_length, d_generator, d_initial_state;
public:
crc16_bb_impl(int length, uint16_t generator, uint16_t initial_state);
~crc16_bb_impl();
void forecast(int noutput_items, gr_vector_int &ninput_items_required);
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_DAB_CRC16_BB_IMPL_H */
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