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// Copyright (C) 2021-2022 Joel Rosdahl and other contributors
//
// See doc/AUTHORS.adoc for a complete list of contributors.
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along with
// this program; if not, write to the Free Software Foundation, Inc., 51
// Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#pragma once
#include <Util.hpp>
#include <util/Bytes.hpp>
#include <third_party/nonstd/span.hpp>
#ifdef USE_XXH_DISPATCH
# include <third_party/xxh_x86dispatch.h>
#else
# include <third_party/xxhash.h>
#endif
#include <cstdint>
#include <cstring>
namespace util {
class XXH3_128
{
public:
static constexpr size_t k_digest_size = 16;
XXH3_128();
~XXH3_128();
void reset();
void update(nonstd::span<const uint8_t> data);
util::Bytes digest() const;
private:
XXH3_state_t* m_state;
};
inline XXH3_128::XXH3_128() : m_state(XXH3_createState())
{
reset();
}
inline XXH3_128::~XXH3_128()
{
XXH3_freeState(m_state);
}
inline void
XXH3_128::reset()
{
XXH3_128bits_reset(m_state);
}
inline void
XXH3_128::update(nonstd::span<const uint8_t> data)
{
XXH3_128bits_update(m_state, data.data(), data.size());
}
inline util::Bytes
XXH3_128::digest() const
{
const auto result = XXH3_128bits_digest(m_state);
util::Bytes digest(k_digest_size);
Util::int_to_big_endian(result.high64, &digest[0]);
Util::int_to_big_endian(result.low64, &digest[8]);
return digest;
}
} // namespace util
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