mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
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111 lines
3.6 KiB
C++
111 lines
3.6 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2014 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_CHECKSUM_SUM_HPP
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#define SPROUT_CHECKSUM_SUM_HPP
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#include <cstddef>
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#include <cstdint>
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#include <climits>
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/limits.hpp>
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#include <sprout/container/functions.hpp>
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#include <sprout/iterator/operation.hpp>
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#include <sprout/iterator/bytes_iterator.hpp>
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#include <sprout/numeric/accumulate.hpp>
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#include <sprout/detail/integer.hpp>
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namespace sprout {
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static_assert(CHAR_BIT == 8, "CHAR_BIT == 8");
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//
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// sum_basic
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//
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template<std::size_t Bits = 8>
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class sum_basic {
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static_assert(Bits % 8 == 0, "Bits % 8 == 0");
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public:
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typedef typename sprout::detail::uint_t<Bits>::least value_type;
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typedef sum_basic const const_type;
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typedef typename std::conditional<
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sizeof(std::size_t) < sizeof(value_type),
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value_type,
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std::size_t
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>::type sum_type;
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private:
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sum_type sum_;
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private:
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template<typename InputIterator>
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SPROUT_CONSTEXPR sum_type calc_sum(InputIterator first, InputIterator last) const {
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return sprout::accumulate(
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sprout::make_bytes_iterator(first),
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sprout::make_bytes_iterator(last),
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sum_
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);
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}
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public:
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SPROUT_CONSTEXPR sum_basic() SPROUT_DEFAULTED_DEFAULT_CONSTRUCTOR_DECL
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sum_basic(sum_basic const&) = default;
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explicit SPROUT_CONSTEXPR sum_basic(sum_type sum)
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: sum_(sum)
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{}
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SPROUT_CXX14_CONSTEXPR void reset(sum_type new_sum = 0) {
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sum_ = new_sum;
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}
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SPROUT_CONSTEXPR sum_basic const process_byte(std::uint8_t byte) const {
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return sum_basic(sum_ + byte);
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}
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template<typename InputIterator>
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SPROUT_CONSTEXPR sum_basic const process_block(InputIterator bytes_begin, InputIterator bytes_end) const {
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return sum_basic(calc_sum(bytes_begin, bytes_end));
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}
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template<typename InputIterator>
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SPROUT_CONSTEXPR sum_basic const process_bytes(InputIterator buffer, std::size_t byte_count) const {
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return process_block(buffer, sprout::next(buffer, byte_count));
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}
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template<typename InputRange>
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SPROUT_CONSTEXPR sum_basic const process_range(InputRange const& bytes_range) const {
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return process_block(sprout::begin(bytes_range), sprout::end(bytes_range));
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}
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SPROUT_CXX14_CONSTEXPR void process_byte(std::uint8_t byte) {
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sum_ += byte;
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}
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template<typename InputIterator>
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SPROUT_CXX14_CONSTEXPR void process_block(InputIterator bytes_begin, InputIterator bytes_end) {
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sum_ = calc_sum(bytes_begin, bytes_end);
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}
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template<typename InputIterator>
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SPROUT_CXX14_CONSTEXPR void process_bytes(InputIterator buffer, std::size_t byte_count) {
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process_block(buffer, sprout::next(buffer, byte_count));
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}
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template<typename InputRange>
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SPROUT_CXX14_CONSTEXPR void process_range(InputRange const& bytes_range) {
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process_block(sprout::begin(bytes_range), sprout::end(bytes_range));
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}
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SPROUT_CONSTEXPR value_type checksum() const {
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return static_cast<value_type>(sum_ & sprout::numeric_limits<value_type>::max());
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}
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SPROUT_CONSTEXPR value_type operator()() const {
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return checksum();
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}
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};
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//
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// sum8
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// sum16
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// sum32
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//
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typedef sprout::sum_basic<8> sum8;
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typedef sprout::sum_basic<16> sum16;
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typedef sprout::sum_basic<32> sum32;
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} // namespace sprout
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#endif // #ifndef SPROUT_CHECKSUM_SUM_HPP
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