coap_status_t object_discover(lwm2m_context_t * contextP,
lwm2m_uri_t * uriP,
uint8_t ** bufferP,
size_t * lengthP)
{
coap_status_t result;
lwm2m_object_t * targetP;
lwm2m_data_t * dataP = NULL;
int size = 0;
targetP = (lwm2m_object_t *)LWM2M_LIST_FIND(contextP->objectList, uriP->objectId);
if (NULL == targetP) return COAP_404_NOT_FOUND;
if (NULL == targetP->discoverFunc) return COAP_501_NOT_IMPLEMENTED;
if (targetP->instanceList == NULL) return COAP_404_NOT_FOUND;
if (LWM2M_URI_IS_SET_INSTANCE(uriP))
{
if (NULL == lwm2m_list_find(targetP->instanceList, uriP->instanceId)) return COAP_404_NOT_FOUND;
// single instance read
if (LWM2M_URI_IS_SET_RESOURCE(uriP))
{
size = 1;
dataP = lwm2m_data_new(size);
if (dataP == NULL) return COAP_500_INTERNAL_SERVER_ERROR;
dataP->id = uriP->resourceId;
uriP->flag &= ~LWM2M_URI_FLAG_RESOURCE_ID;
}
result = targetP->discoverFunc(uriP->instanceId, &size, &dataP, targetP);
}
else
{
// multiple object instances read
lwm2m_list_t * instanceP;
int i;
size = 0;
for (instanceP = targetP->instanceList; instanceP != NULL ; instanceP = instanceP->next)
{
size++;
}
dataP = lwm2m_data_new(size);
if (dataP == NULL) return COAP_500_INTERNAL_SERVER_ERROR;
result = COAP_205_CONTENT;
instanceP = targetP->instanceList;
i = 0;
while (instanceP != NULL && result == COAP_205_CONTENT)
{
result = targetP->discoverFunc(instanceP->id, (int*)&(dataP[i].value.asChildren.count), &(dataP[i].value.asChildren.array), targetP);
dataP[i].type = LWM2M_TYPE_OBJECT_INSTANCE;
dataP[i].id = instanceP->id;
i++;
instanceP = instanceP->next;
}
}
if (result == COAP_205_CONTENT)
{
int len;
len = discover_serialize(contextP, uriP, size, dataP, bufferP);
if (len <= 0) result = COAP_500_INTERNAL_SERVER_ERROR;
else *lengthP = len;
}
lwm2m_data_free(size, dataP);
return result;
}
int lwm2m_data_serialize(lwm2m_uri_t * uriP,
int size,
lwm2m_data_t * dataP,
lwm2m_media_type_t * formatP,
uint8_t ** bufferP)
{
LOG_URI(uriP);
LOG_ARG("size: %d, formatP: %s", size, STR_MEDIA_TYPE(*formatP));
// Check format
if (*formatP == LWM2M_CONTENT_TEXT
|| *formatP == LWM2M_CONTENT_OPAQUE)
{
if (size != 1
|| (uriP != NULL && !LWM2M_URI_IS_SET_RESOURCE(uriP))
|| dataP->type == LWM2M_TYPE_OBJECT
|| dataP->type == LWM2M_TYPE_OBJECT_INSTANCE
|| dataP->type == LWM2M_TYPE_MULTIPLE_RESOURCE)
{
#ifdef LWM2M_SUPPORT_JSON
*formatP = LWM2M_CONTENT_JSON;
#else
*formatP = LWM2M_CONTENT_TLV;
#endif
}
}
if (*formatP == LWM2M_CONTENT_OPAQUE
&& dataP->type != LWM2M_TYPE_OPAQUE)
{
LOG("Opaque format is reserved to opaque resources.");
return -1;
}
LOG_ARG("Final format: %s", STR_MEDIA_TYPE(*formatP));
switch (*formatP)
{
case LWM2M_CONTENT_TEXT:
return prv_textSerialize(dataP, bufferP);
case LWM2M_CONTENT_OPAQUE:
*bufferP = (uint8_t *)lwm2m_malloc(dataP->value.asBuffer.length);
if (*bufferP == NULL) return -1;
memcpy(*bufferP, dataP->value.asBuffer.buffer, dataP->value.asBuffer.length);
return (int)dataP->value.asBuffer.length;
case LWM2M_CONTENT_TLV:
case LWM2M_CONTENT_TLV_OLD:
{
bool isResourceInstance;
if (uriP != NULL && LWM2M_URI_IS_SET_RESOURCE(uriP)
&& (size != 1 || dataP->id != uriP->resourceId))
{
isResourceInstance = true;
}
else
{
isResourceInstance = false;
}
return tlv_serialize(isResourceInstance, size, dataP, bufferP);
}
#ifdef LWM2M_CLIENT_MODE
case LWM2M_CONTENT_LINK:
return discover_serialize(NULL, uriP, NULL, size, dataP, bufferP);
#endif
#ifdef LWM2M_SUPPORT_JSON
case LWM2M_CONTENT_JSON:
case LWM2M_CONTENT_JSON_OLD:
return json_serialize(uriP, size, dataP, bufferP);
#endif
default:
return -1;
}
}