/*
 * eth_icmp.cpp
 *
 *  Created on: 14 ���. 2023 �.
 *      Author: sychev
 */
#include "ethernet_ip/eth_icmp.hpp"
#include "ethernet_ip/eth_icmp_types.h"
#include "ethernet_ip/eth_ip_checksum.h"
#include "base/swap.h"

int32_t free_rtos::EthIcmp::Process(uint8_t * p_data, uint32_t len)
{
    TIcmpEchoHeader * hdr = (TIcmpEchoHeader*)p_data;
    uint32_t ul_icmp_len = len;

    if (hdr->type != ICMP_ECHO_REQUEST) {
        return 0;
    }

    hdr->type = ICMP_ECHO_REPLY;
    hdr->code = 0;
    hdr->cksum = 0;

    /* Checksum of the ICMP message */
    if (ul_icmp_len % 2)
    {
        *(((uint8_t *) hdr) + ul_icmp_len) = 0;
        ++ul_icmp_len;
    }

    ul_icmp_len = ul_icmp_len / 2;

    uint16_t chsum = eth_ip_calcChecksum((uint16_t *)hdr, ul_icmp_len);

    hdr->cksum = BASE_SWAP16(chsum);

    ++rx_cnt_;

    return len;
}

uint32_t free_rtos::EthIcmp::Sender(uint8_t * p_data, size_t scatter_segment)
{
    return 0;
}