/*

 * Copyright (c) 2020-2022, the SerenityOS developers.

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#pragma once

#include <AK/Span.h>

#include <AK/Types.h>

#include <LibCrypto/Checksum/ChecksumFunction.h>

namespace Crypto::Checksum {

class Adler32 : public ChecksumFunction<u32> {

public:

    Adler32() = default;

    Adler32(ReadonlyBytes data)

    {

        update(data);

    }

    Adler32(u32 initial_a, u32 initial_b, ReadonlyBytes data)

        : m_state_a(initial_a)

        , m_state_b(initial_b)

    {

        update(data);

    }

    virtual void update(ReadonlyBytes data) override;

    virtual u32 digest() override;

private:

    u32 m_state_a { 1 };

    u32 m_state_b { 0 };

};

}