/*

* Adler32

* (C) 1999-2007 Jack Lloyd

*

* Botan is released under the Simplified BSD License (see license.txt)

*/

#ifndef BOTAN_ADLER32_H_

#define BOTAN_ADLER32_H_

#include <botan/hash.h>

namespace Botan {

/**

* The Adler32 checksum, used in zlib

*/

class Adler32 final : public HashFunction {

   public:

      std::string name() const override { return "Adler32"; }

      size_t output_length() const override { return 4; }

      std::unique_ptr<HashFunction> new_object() const override { return std::make_unique<Adler32>(); }

      std::unique_ptr<HashFunction> copy_state() const override;

      void clear() override {

         m_S1 = 1;

         m_S2 = 0;

      }

      Adler32() { clear(); }

      ~Adler32() { clear(); }

   private:

      void add_data(const uint8_t[], size_t) override;

      void final_result(uint8_t[]) override;

      uint16_t m_S1, m_S2;

};

}  // namespace Botan

#endif