crc32.hpp

#pragma once
#include <cstdint>

class CRC32 {
  public:
    CRC32();
    void reset();
    void update(const uint8_t &data);
    template <typename Type> void update(const Type &data) { update(&data, 1); }
    template <typename Type> void update(const Type *data, std::size_t size) {
        std::size_t nBytes = size * sizeof(Type);
        const uint8_t *pData = (const uint8_t *)data;
 
        for (std::size_t i = 0; i < nBytes; i++) {
            update(pData[i]);
        }
    }

    uint32_t finalize() const;
    template <typename Type> static uint32_t calculate(const Type *data, std::size_t size) {
        CRC32 crc;
        crc.update(data, size);
        return crc.finalize();
    }
 
  private:
    uint32_t _state = ~0L;
};