Crc16.h

// Copyright QED Software 2023.
 
#ifndef GRAIL_CRC16_H
#define GRAIL_CRC16_H
 
#include <cstddef>
#include <cstdint>
#include <string>
 
namespace grail
{
namespace live
{
    class Crc16
    {
    public:
        Crc16();
 
        std::uint16_t ComputeChecksum(const uint8_t* bytes, std::size_t startingIndex, std::size_t length) const;
        std::uint8_t* ComputeChecksumBytes(const std::string& bytes) const;
        std::uint8_t* ComputeChecksumBytes(const uint8_t* bytes, std::size_t startingIndex, std::size_t length) const;
 
        inline static constexpr std::size_t crcBytes = sizeof(uint16_t); 
 
    private:
        constexpr static const std::uint16_t POLYNOMIAL = 0xA001;
        constexpr static const std::size_t TABLE_SIZE = 256;
        std::uint16_t table[TABLE_SIZE]{};
 
        const char BYTE_SIZE = 8;
    };
}
}
 
#endif // GRAIL_CRC16_H