mirror of
https://github.com/bolero-MURAKAMI/Sprout.git
synced 2024-11-14 10:39:05 +00:00
91 lines
2.9 KiB
C++
91 lines
2.9 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2011-2013 Bolero MURAKAMI
|
|
https://github.com/bolero-MURAKAMI/Sprout
|
|
|
|
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
=============================================================================*/
|
|
#ifndef SPROUT_CHECKSUM_XOR_HPP
|
|
#define SPROUT_CHECKSUM_XOR_HPP
|
|
|
|
#include <cstddef>
|
|
#include <cstdint>
|
|
#include <sprout/config.hpp>
|
|
#include <sprout/container/functions.hpp>
|
|
#include <sprout/iterator/operation.hpp>
|
|
#include <sprout/iterator/bytes_iterator.hpp>
|
|
#include <sprout/numeric/accumulate.hpp>
|
|
#include <sprout/functional/polymorphic/bit_xor.hpp>
|
|
|
|
namespace sprout {
|
|
//
|
|
// xor8
|
|
//
|
|
class xor8 {
|
|
public:
|
|
typedef std::uint8_t value_type;
|
|
typedef xor8 const const_type;
|
|
typedef std::size_t sum_type;
|
|
private:
|
|
sum_type sum_;
|
|
private:
|
|
template<typename InputIterator>
|
|
SPROUT_CONSTEXPR sum_type calc_sum(InputIterator first, InputIterator last) const {
|
|
return sprout::accumulate(
|
|
sprout::make_bytes_iterator(first),
|
|
sprout::make_bytes_iterator(last),
|
|
sum_,
|
|
sprout::bit_xor_
|
|
);
|
|
}
|
|
public:
|
|
SPROUT_CONSTEXPR xor8(xor8 const&) = default;
|
|
explicit SPROUT_CONSTEXPR xor8(sum_type sum)
|
|
: sum_(sum)
|
|
{}
|
|
void reset(sum_type new_sum = 0) {
|
|
sum_ = new_sum;
|
|
}
|
|
|
|
SPROUT_CONSTEXPR xor8 const process_byte(std::uint8_t byte) const {
|
|
return xor8(sum_ ^ byte);
|
|
}
|
|
template<typename InputIterator>
|
|
SPROUT_CONSTEXPR xor8 const process_block(InputIterator bytes_begin, InputIterator bytes_end) const {
|
|
return xor8(calc_sum(bytes_begin, bytes_end));
|
|
}
|
|
template<typename InputIterator>
|
|
SPROUT_CONSTEXPR xor8 const process_bytes(InputIterator buffer, std::size_t byte_count) const {
|
|
return process_block(buffer, sprout::next(buffer, byte_count));
|
|
}
|
|
template<typename InputRange>
|
|
SPROUT_CONSTEXPR xor8 const process_range(InputRange const& bytes_range) const {
|
|
return process_block(sprout::begin(bytes_range), sprout::end(bytes_range));
|
|
}
|
|
|
|
void process_byte(std::uint8_t byte) {
|
|
sum_ ^= byte;
|
|
}
|
|
template<typename InputIterator>
|
|
void process_block(InputIterator bytes_begin, InputIterator bytes_end) {
|
|
sum_ = calc_sum(bytes_begin, bytes_end);
|
|
}
|
|
template<typename InputIterator>
|
|
void process_bytes(InputIterator buffer, std::size_t byte_count) {
|
|
process_block(buffer, sprout::next(buffer, byte_count));
|
|
}
|
|
template<typename InputRange>
|
|
void process_range(InputRange const& bytes_range) {
|
|
process_block(sprout::begin(bytes_range), sprout::end(bytes_range));
|
|
}
|
|
|
|
SPROUT_CONSTEXPR value_type checksum() const {
|
|
return static_cast<value_type>(sum_ & 0xFF);
|
|
}
|
|
SPROUT_CONSTEXPR value_type operator()() const {
|
|
return checksum();
|
|
}
|
|
};
|
|
} // namespace sprout
|
|
|
|
#endif // #ifndef SPROUT_CHECKSUM_XOR_HPP
|