//
// Created by epagris on 2022.12.10..
//

#include <memory.h>
#include "arp_cache.h"
#include "dynmem.h"

ArpCache *arpc_new(uint16_t size) {
    ArpCache * arcp = (ArpCache *) dynmem_alloc(2 * sizeof(uint16_t) + size * sizeof(ArpEntry));
    arcp->size = size;
    arcp->fill = 0;
    return arcp;
}

void arpc_free(ArpCache *aprc) {
    dynmem_free(aprc);
}

void arpc_learn(ArpCache *arpc, const ArpEntry *newEntry) {
    // TODO: nagyon dummy...
    for (uint16_t i = 0; i < arpc->fill; i++) {
        ArpEntry * entry = arpc->entries + i;
        if (!memcmp(entry->eth, newEntry->eth, ETH_HW_ADDR_LEN) && (entry->ip == newEntry->ip)) {
            return;
        }
    }

    // if not found...
    arpc->entries[arpc->fill++] = *newEntry;
}

const ArpEntry *arpc_get(ArpCache *arpc, ip4_addr ip) {
    for (uint16_t i = 0; i < arpc->fill; i++) {
        ArpEntry * entry = arpc->entries + i;
        if (entry->ip == ip) {
            return entry;
        }
    }

    return NULL;
}