/**
* Compress the 64 bit address
*
* @param The pbuf which is the ieee 802.15.4 frame.
* @return NONE
*/
static u8_t
lowpan_compress_addr_64 (u8_t **hc06_ptr, u8_t shift,
const struct in6_addr *ipaddr,
const u8_t *mac_addr)
{
if (is_addr_mac_addr_based(ipaddr, mac_addr)) {
return (3 << shift); /* 0-bits */
} else if (lowpan_is_iid_16_bit_compressable(ipaddr)) {
/* compress IID to 16 bits xxxx::XXXX */
MEMCPY(*hc06_ptr, &(((u16_t *)(ipaddr->s6_addr))[7]), 2);
*hc06_ptr += 2;
return (2 << shift); /* 16-bits */
} else {
/* do not compress IID => xxxx::IID */
MEMCPY(*hc06_ptr, &(((u16_t *)(ipaddr->s6_addr))[4]), 8);
*hc06_ptr += 8;
return (1 << shift); /* 64-bits */
}
}
static u8
lowpan_compress_addr_64(u8 **hc06_ptr, u8 shift, const struct in6_addr *ipaddr,
const unsigned char *lladdr)
{
u8 val = 0;
if (is_addr_mac_addr_based(ipaddr, lladdr))
val = 3; /* 0-bits */
else if (lowpan_is_iid_16_bit_compressable(ipaddr)) {
/* compress IID to 16 bits xxxx::XXXX */
memcpy(*hc06_ptr, &ipaddr->s6_addr16[7], 2);
*hc06_ptr += 2;
val = 2; /* 16-bits */
} else {
/* do not compress IID => xxxx::IID */
memcpy(*hc06_ptr, &ipaddr->s6_addr16[4], 8);
*hc06_ptr += 8;
val = 1; /* 64-bits */
}
return rol8(val, shift);
}
