#pragma once
//
//    FILE: Fletcher.h
//  AUTHOR: Rob Tillaart
// VERSION: 0.1.9
//    DATE: 2022-01-25
// PURPOSE: Arduino Library for calculating Fletcher's checksum
//     URL: https://github.com/RobTillaart/Fletcher
//          https://en.wikipedia.org/wiki/Fletcher%27s_checksum


#include "Arduino.h"


#define FLETCHER_LIB_VERSION              (F("0.1.9"))

#define FLETCHER_16                       255
#define FLETCHER_32                       65535UL
#define FLETCHER_64                       4294967295ULL


//
//  straightforward implementation.
//  max length buffer 65534.
//  Wikipedia shows optimizations.
//
//  Since 0.1.8: added parameters s1 and s2 to make functions more versatile.

uint16_t fletcher16(uint8_t *data, uint16_t length, uint32_t s1 = 0, uint32_t s2 = 0);

uint32_t fletcher32(uint16_t *data, uint16_t length, uint32_t s1 = 0, uint32_t s2 = 0);

uint64_t fletcher64(uint32_t *data, uint16_t length, uint64_t s1 = 0, uint64_t s2 = 0);


//  -- END OF FILE --