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41 lines
829 B
C++
41 lines
829 B
C++
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//
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// CRC.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 18/09/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#ifndef CRC_hpp
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#define CRC_hpp
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#include <cstdint>
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namespace NumberTheory {
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class CRC16 {
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public:
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CRC16(uint16_t polynomial, uint16_t reset_value) :
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reset_value_(reset_value), value_(reset_value), polynomial_(polynomial) {}
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inline void reset() { value_ = reset_value_; }
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inline void add(uint8_t value) {
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// TODO: go table based
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value_ ^= (uint16_t)value << 8;
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for(int c = 0; c < 8; c++)
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{
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uint16_t exclusive_or = (value_&0x8000) ? polynomial_ : 0x0000;
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value_ = (uint16_t)(value_ << 1) ^ exclusive_or;
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}
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}
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inline uint16_t get_value() { return value_; }
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private:
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uint16_t reset_value_, polynomial_;
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uint16_t value_;
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};
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}
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#endif /* CRC_hpp */
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