fletcher16.h

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#include <stdint.h>
#include <stdlib.h>
 
uint16_t fletcher16(const void* input_str, size_t num_bytes)
{
    uint16_t sum = 0;
    uint8_t* sum1 = (uint8_t*)&sum;
    uint8_t* sum2 = sum1 + 1;
 
    const uint8_t* buf = (uint8_t*)input_str;
 
    for (int i = 0; i < num_bytes; i++)
    {
        (*sum1) += buf[i];
        (*sum2) += (*sum1);
    }
 
    return sum;
}