nes-proj/apps/rest-coap/coap-common.c

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/*
* coap-common.c
*
* Created on: Aug 30, 2010
* Author: dogan
*/
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#ifdef CONTIKI_TARGET_NETSIM
#include <stdio.h>
#include <iostream>
#include <cstring>
#include <cstdlib>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
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#else
#include "contiki.h"
#include "contiki-net.h"
#include <string.h>
#endif
#include "coap-common.h"
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#define PRINT6ADDR(addr) PRINTF(" %02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x ", ((u8_t *)addr)[0], ((u8_t *)addr)[1], ((u8_t *)addr)[2], ((u8_t *)addr)[3], ((u8_t *)addr)[4], ((u8_t *)addr)[5], ((u8_t *)addr)[6], ((u8_t *)addr)[7], ((u8_t *)addr)[8], ((u8_t *)addr)[9], ((u8_t *)addr)[10], ((u8_t *)addr)[11], ((u8_t *)addr)[12], ((u8_t *)addr)[13], ((u8_t *)addr)[14], ((u8_t *)addr)[15])
#define PRINTLLADDR(lladdr) PRINTF(" %02x:%02x:%02x:%02x:%02x:%02x ",(lladdr)->addr[0], (lladdr)->addr[1], (lladdr)->addr[2], (lladdr)->addr[3],(lladdr)->addr[4], (lladdr)->addr[5])
#else
#define PRINTF(...)
#define PRINT6ADDR(addr)
#define PRINTLLADDR(addr)
#endif
void init_packet(coap_packet_t* packet)
{
packet->ver = 1;
packet->type = 0;
packet->option_count = 0;
packet->code = 0;
packet->tid = 0;
packet->options = NULL;
packet->url = NULL;
packet->url_len = 0;
packet->query = NULL;
packet->query_len = 0;
packet->payload = NULL;
packet->payload_len = 0;
}
int serialize_packet(coap_packet_t* packet, uint8_t* buffer)
{
int index = 0;
header_option_t* option = NULL;
uint16_t option_delta = 0;
buffer[0] = (packet->ver) << COAP_HEADER_VERSION_POSITION;
buffer[0] |= (packet->type) << COAP_HEADER_TYPE_POSITION;
buffer[0] |= packet->option_count;
buffer[1] = packet->code;
uint16_t temp = uip_htons(packet->tid);
memcpy(
(void*)&buffer[2],
(void*)(&temp),
sizeof(packet->tid));
index += 4;
PRINTF("serialize option_count %u\n", packet->option_count);
/*Options should be sorted beforehand*/
for (option = packet->options ; option ; option = option->next){
uint16_t delta = option->option - option_delta;
if ( !delta ){
PRINTF("WARNING: Delta==Zero\n");
}
buffer[index] = (delta) << COAP_HEADER_OPTION_DELTA_POSITION;
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PRINTF("option %u len %u option diff %u option_value addr %x option addr %x next option addr %x", option->option, option->len, option->option - option_delta, (unsigned int) option->value, (unsigned int)option, (unsigned int)option->next);
int i = 0;
for ( ; i < option->len ; i++ ){
PRINTF(" (%u)", option->value[i]);
}
PRINTF("\n");
if (option->len < 0xF){
buffer[index] |= option->len;
index++;
} else{
buffer[index] |= (0xF); //1111
buffer[index + 1] = option->len - (0xF);
index += 2;
}
memcpy((char*)&buffer[index], option->value, option->len);
index += option->len;
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option_delta = option->option;
}
if(packet->payload){
memcpy(&buffer[index], packet->payload, packet->payload_len);
index += packet->payload_len;
}
return index;
}