Crc16.h

#ifndef GRAIL_CRC16_H
#define GRAIL_CRC16_H
 
#include <cstdint>
#include <cstddef>
#include <string>
 
namespace grail
{
    class Crc16
    {
    public:
        Crc16();
 
        std::uint16_t ComputeChecksum(std::string bytes, std::size_t startingIndex, std::size_t length) const;
        std::string ComputeChecksumBytes(const std::string& bytes) const;
        std::string ComputeChecksumBytes(std::string bytes, std::size_t startingIndex, std::size_t length) const;
 
 
    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