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77 lines
1.4 KiB
C++
77 lines
1.4 KiB
C++
//
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// FILE: Fletcher64.cpp
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// AUTHOR: Rob Tillaart
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// PURPOSE: Arduino class for Fletcher32
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// URL: https://github.com/RobTillaart/Fletcher
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#include "Fletcher64.h"
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// UINT32_MAX = 4294967295ULL = ((((uint64_t) 1) << 32) - 1)
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#define FLETCHER_64 UINT32_MAX
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Fletcher64::Fletcher64()
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{
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begin();
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}
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void Fletcher64::begin(uint32_t s1, uint32_t s2)
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{
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_s1 = (s1 == FLETCHER_64) ? 0 : s1;
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_s2 = (s2 == FLETCHER_64) ? 0 : s2;
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_count = 0;
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}
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void Fletcher64::add(uint32_t value)
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{
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_count++;
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#if defined(ARDUINO_ARCH_AVR) || defined(ESP32) || defined(ESP8266)
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uint32_t t = 0xFFFFFFFF - value;
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if (t >= _s1) _s1 += value;
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else _s1 = _s1 + value + 1;
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t = 0xFFFFFFFF - _s1;
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if (t >= _s2) _s2 += _s1;
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else _s2 = _s2 + _s1 + 1;
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#elif defined(ARDUINO_ARCH_SAMD)
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_s1 += value;
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_s1 = (_s1 & FLETCHER_64) + (_s1 >> 32);
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_s2 += _s1;
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_s2 = (_s2 & FLETCHER_64) + (_s2 >> 32);
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#else
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_s1 += value;
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if (_s1 >= FLETCHER_64) _s1 -= FLETCHER_64;
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_s2 += _s1;
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if (_s2 >= FLETCHER_64) _s2 -= FLETCHER_64;
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#endif
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}
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void Fletcher64::add(const uint32_t * array, uint16_t length)
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{
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while (length--)
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{
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add(*array++);
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}
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}
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uint64_t Fletcher64::getFletcher()
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{
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if (_s1 >= FLETCHER_64) _s1 -= FLETCHER_64;
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if (_s2 >= FLETCHER_64) _s2 -= FLETCHER_64;
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return (((uint64_t)_s2) << 32) | _s1;
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};
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uint32_t Fletcher64::count()
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{
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return _count;
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};
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// -- END OF FILE --
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