/*
 * eth_ip_checksum.c
 *
 *  Created on: 14 мар. 2023 г.
 *      Author: sychev
 */
#include "eth_ip_checksum.h"
#include "base/swap.h"

uint16_t eth_ip_calcChecksum(uint16_t * const data, uint32_t length)
{
    uint32_t i, crc = 0;

    for (i = 0 ; i < length; ++i ) {
        crc += BASE_SWAP16(data[i]);
    }

    crc = (crc & 0xffff) + (crc >> 16);

    return (uint16_t) (~crc);
}