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jLynx 2023-05-19 08:16:05 +12:00 • committed by GitHub
parent 7aca7ce74d
commit 033c4e9a5b
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599 changed files with 70746 additions and 66896 deletions
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70
firmware/common/bit_pattern.hpp
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@ -26,48 +26,46 @@
#include <cstddef>
class BitHistory {
public:
void add(const uint_fast8_t bit) {
history = (history << 1) | (bit & 1);
}
public:
void add(const uint_fast8_t bit) {
history = (history << 1) | (bit & 1);
}
uint64_t value() const {
return history;
}
uint64_t value() const {
return history;
}
private:
uint64_t history { 0 };
private:
uint64_t history{0};
};
class BitPattern {
public:
constexpr BitPattern(
) : code_ { 0 },
mask_ { 0 },
maximum_hanning_distance_ { 0 }
{
}
constexpr BitPattern(
const uint64_t code,
const size_t code_length,
const size_t maximum_hanning_distance = 0
) : code_ { code },
mask_ { (1ULL << code_length) - 1ULL },
maximum_hanning_distance_ { maximum_hanning_distance }
{
}
public:
constexpr BitPattern()
: code_{0},
mask_{0},
maximum_hanning_distance_{0} {
}
bool operator()(const BitHistory& history, const size_t) const {
const auto delta_bits = (history.value() ^ code_) & mask_;
const size_t count = __builtin_popcountll(delta_bits);
return (count <= maximum_hanning_distance_);
}
constexpr BitPattern(
const uint64_t code,
const size_t code_length,
const size_t maximum_hanning_distance = 0)
: code_{code},
mask_{(1ULL << code_length) - 1ULL},
maximum_hanning_distance_{maximum_hanning_distance} {
}
private:
uint64_t code_;
uint64_t mask_;
size_t maximum_hanning_distance_;
bool operator()(const BitHistory& history, const size_t) const {
const auto delta_bits = (history.value() ^ code_) & mask_;
const size_t count = __builtin_popcountll(delta_bits);
return (count <= maximum_hanning_distance_);
}
private:
uint64_t code_;
uint64_t mask_;
size_t maximum_hanning_distance_;
};
#endif/*__BIT_PATTERN_H__*/
#endif /*__BIT_PATTERN_H__*/