crc.h
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/* -*- c++ -*- */
/*
* Copyright 2022 Daniel Estevez <daniel@destevez.net>
*
* This file is part of gr-satellites
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifndef INCLUDED_SATELLITES_CRC_H
#define INCLUDED_SATELLITES_CRC_H
#include <satellites/api.h>
#include <stdint.h>
#include <array>
#include <vector>
namespace gr {
namespace satellites {
/*!
* \brief Calculates a CRC
* \ingroup satellites
*
* \details
* This class calculates a CRC with configurable parameters.
* A table-driven byte-by-byte approach is used in the CRC
* computation.
*/
class SATELLITES_API crc
{
public:
/*!
* \brief Construct a CRC calculator instance.
*
* \param num_bits CRC size in bits
* \param poly CRC polynomial, in MSB-first notation
* \param initial_value Initial register value
* \param final_xor Final XOR value
* \param input_reflected true if the input is LSB-first, false if not
* \param result_reflected true if the output is LSB-first, false if not
*/
crc(unsigned num_bits,
uint64_t poly,
uint64_t initial_value,
uint64_t final_xor,
bool input_reflected,
bool result_reflected);
~crc();
/*!
* \brief Computes a CRC
*
* \param data the input data for the CRC calculation
* \param len the length in bytes of the data
*/
uint64_t compute(const uint8_t* data, std::size_t len);
/*!
* \brief Computes a CRC
*
* \param data the input data for the CRC calculation
*/
uint64_t compute(const std::vector<uint8_t> data)
{
return compute(data.data(), data.size());
}
private:
std::array<uint64_t, 256> d_table;
unsigned d_num_bits;
uint64_t d_mask;
uint64_t d_initial_value;
uint64_t d_final_xor;
bool d_input_reflected;
bool d_result_reflected;
uint64_t reflect(uint64_t word);
};
} // namespace satellites
} // namespace gr
#endif /* INCLUDED_SATELLITES_CRC_H */
api.h
SATELLITES_API
#define SATELLITES_API
Definition api.h:31
gr::satellites::crc::compute
uint64_t compute(const uint8_t *data, std::size_t len)
Computes a CRC.
gr::satellites::crc::crc
crc(unsigned num_bits, uint64_t poly, uint64_t initial_value, uint64_t final_xor, bool input_reflected, bool result_reflected)
Construct a CRC calculator instance.
gr::satellites::crc::compute
uint64_t compute(const std::vector< uint8_t > data)
Computes a CRC.
Definition crc.h:66
gr::satellites::crc::~crc
~crc()
gr::satellites
Definition ax100_decode.h:18
gr
Definition ax100_decode.h:17