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61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
#pragma once
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/*
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Author: Daniel Mohr
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Date: 2022-09-09
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Here are implementations, which were used in release '0.1.3'.
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Fletcher16.cpp
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Fletcher16.h
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Fletcher32.cpp
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Fletcher32.h
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Fletcher64.cpp
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Fletcher64.h
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*/
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#define FLETCHER_16_v0_1_3 255
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#define FLETCHER_32_v0_1_3 65535UL
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#define FLETCHER_64_v0_1_3 4294967295ULL
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uint16_t fletcher16_v0_1_3(uint8_t *data, const uint16_t length)
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{
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uint16_t _s1 = 0;
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uint16_t _s2 = 0;
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for (uint16_t i = 0; i < length; i++)
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{
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_s1 += data[i];
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if (_s1 >= FLETCHER_16_v0_1_3) _s1 -= FLETCHER_16_v0_1_3;
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_s2 += _s1;
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if (_s2 >= FLETCHER_16_v0_1_3) _s2 -= FLETCHER_16_v0_1_3;
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}
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return (_s2 << 8) | _s1;
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}
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uint32_t fletcher32_v0_1_3(uint16_t *data, const uint16_t length)
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{
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uint32_t _s1 = 0;
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uint32_t _s2 = 0;
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for (uint16_t i = 0; i < length; i++)
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{
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_s1 += data[i];
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if (_s1 >= FLETCHER_32_v0_1_3) _s1 -= FLETCHER_32_v0_1_3;
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_s2 += _s1;
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if (_s2 >= FLETCHER_32_v0_1_3) _s2 -= FLETCHER_32_v0_1_3;
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}
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return (_s2 << 16) | _s1;
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}
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uint64_t fletcher64_v0_1_3(uint32_t *data, const uint16_t length)
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{
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uint64_t _s1 = 0;
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uint64_t _s2 = 0;
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for (uint16_t i = 0; i < length; i++)
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{
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_s1 += data[i];
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if (_s1 >= FLETCHER_64_v0_1_3) _s1 -= FLETCHER_64_v0_1_3;
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_s2 += _s1;
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if (_s2 >= FLETCHER_64_v0_1_3) _s2 -= FLETCHER_64_v0_1_3;
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}
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return (_s2 << 32) | _s1;
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}
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