dazibao/src/tlv.c

#include "tlv.h"

int build_pad1(tlv *tlv) {
	// Free the previously allocated memory
	free(tlv->pad1);

	pad1 *new = (pad1*) malloc(sizeof(pad1));
	memset(new, 0, sizeof(pad1));

	if(new == NULL)
		return -1;

	new->type = 0;

	tlv->pad1 = new;

	return 0;
}

int build_padn(tlv *tlv, size_t len) {
	// Free the previously allocated memory
	free(tlv->pad1);

	padn *new = (padn*) malloc(sizeof(padn));
	memset(new, 0, sizeof(padn));

	if(new == NULL)
		return -1;

	new->type = 1;
	new->length = len;
	memset(new->mbz, 0, 256);

	tlv->padn = new;

	return 0;
}

int build_neighbour_req(tlv *tlv) {
	// Free the previously allocated memory
	free(tlv->pad1);

	neighbour_req *new = (neighbour_req*) malloc(sizeof(neighbour_req));
	memset(new, 0, sizeof(neighbour_req));

	if(new == NULL){
		return -1;
	}

	new->type = 2;
	new->length = 0;

	tlv->neighbour_req = new;

	return 0;
}

int build_neighbour(tlv *tlv, struct in6_addr ip, int16_t port) {
	// Free the previously allocated memory
	// TODO : why do we free this part ? Doesn't it mean that, once the
	// tlv has entered this function, it's not on the heap anymore,
	// and thus, setting a value will not be accessible from other part of the
	// code ?
	free(tlv->pad1);

	neighbour *new = (neighbour*) malloc(sizeof(neighbour));
	memset(new, 0, sizeof(neighbour));

	if(new == NULL)
		return -1;

	new->type = 3;
	new->length = 18;
	new->ip = ip;
	new->port = htobe16(port);

	tlv->neighbour = new;

	return 0;
}

int build_network_hash(tlv *tlv, list *data_list) {
	// Free the previously allocated memory
	free(tlv->pad1);

	network_hash *new = (network_hash*) malloc(sizeof(network_hash));
	memset(new, 0, sizeof(network_hash));

	if(new == NULL)
		return -1;

	new->type = 4;
	new->length = 16;
	hash_network(data_list, new->network_hash);

	tlv->network_hash = new;

	return 0;
}

int build_network_state_req(tlv *tlv) {
	// Free the previously allocated memory
	free(tlv->pad1);

	network_state_req *new = (network_state_req*) malloc(sizeof(network_state_req));
	memset(new,0,sizeof(network_state_req));

	if(new == NULL)
		return -1;

	new->type = 5;
	new->length = 0;

	tlv->network_state_req = new;

	return 0;
}

int build_node_hash(tlv *tlv, uint64_t node_id, uint16_t seqno, char *data, unsigned char length) {
	// Free the previously allocated memory
	free(tlv->pad1);

	node_hash *new = (node_hash*) malloc(sizeof(node_hash));
	memset(new,0,sizeof(node_hash));

	if(new == NULL)
		return -1;

	new->type = 6;
	new->length = 26;
	new->node_id = htobe64(node_id);
	new->seqno = htobe16(seqno);

	pub_data pdata = (pub_data) {.length = length, .id = node_id, .seqno = seqno, .data = data};
	hash_data(&pdata, new->node_hash);

	tlv->node_hash = new;

	return 0;
}

int build_node_state_req(tlv *tlv, uint64_t node_id) {
	// Free the previously allocated memory
	free(tlv->pad1);

	node_state_req *new = (node_state_req*) malloc(sizeof(node_state_req));
	memset(new, 0, sizeof(node_state_req));

	if(new == NULL)
		return -1;

	new->type = 7;
	new->length = 8;
	new->node_id = htobe64(node_id);

	tlv->node_state_req = new;

	return 0;
}

int build_node_state(tlv *tlv, uint64_t node_id, uint16_t seqno, char *data, size_t data_len) {
	// Free the previously allocated memory
	free(tlv->pad1);

	node_state *new = (node_state*) malloc(sizeof(node_state));
	memset(new, 0, sizeof(node_state));

	if(new == NULL)
		return -1;

	new->type = 8;
	new->length = data_len + 26;
	new->node_id = htobe64(node_id);
	new->seqno = htobe16(seqno);
	memcpy(new->data, data, data_len);

	pub_data pdata = (pub_data) {.length = data_len, .id = node_id, .seqno = seqno, .data = data};
	hash_data(&pdata, new->node_hash);

	tlv->node_state = new;

	return 0;
}

int build_warning(tlv *tlv, char *message, size_t message_len) {
	// Free the previously allocated memory
	free(tlv->pad1);

	warning *new = (warning*) malloc(sizeof(warning));
	memset(new, 0, sizeof(warning));

	int len = message_len;

	if(new == NULL)
		return -1;

	new->type = 9;
	new->length = len;
	memcpy(new->message, message, len);

	tlv->warning = new;

	return 0;
}