int prv_serializeData(lwm2m_data_t * tlvP,
uint8_t * parentUriStr,
size_t parentUriLen,
uint8_t * buffer,
size_t bufferLen)
{
int head;
int res;
head = 0;
switch (tlvP->type)
{
case LWM2M_TYPE_OBJECT:
case LWM2M_TYPE_OBJECT_INSTANCE:
case LWM2M_TYPE_MULTIPLE_RESOURCE:
{
uint8_t uriStr[URI_MAX_STRING_LEN];
size_t uriLen;
size_t index;
if (parentUriLen > 0)
{
if (URI_MAX_STRING_LEN < parentUriLen) return -1;
memcpy(uriStr, parentUriStr, parentUriLen);
uriLen = parentUriLen;
}
else
{
uriLen = 0;
}
res = utils_intToText(tlvP->id, uriStr + uriLen, URI_MAX_STRING_LEN - uriLen);
if (res <= 0) return -1;
uriLen += res;
uriStr[uriLen] = '/';
uriLen++;
head = 0;
for (index = 0 ; index < tlvP->value.asChildren.count; index++)
{
res = prv_serializeData(tlvP->value.asChildren.array + index, uriStr, uriLen, buffer + head, bufferLen - head);
if (res < 0) return -1;
head += res;
}
}
break;
default:
if (bufferLen < JSON_RES_ITEM_URI_SIZE) return -1;
memcpy(buffer, JSON_RES_ITEM_URI, JSON_RES_ITEM_URI_SIZE);
head = JSON_RES_ITEM_URI_SIZE;
if (parentUriLen > 0)
{
if (bufferLen - head < parentUriLen) return -1;
memcpy(buffer + head, parentUriStr, parentUriLen);
head += parentUriLen;
}
res = utils_intToText(tlvP->id, buffer + head, bufferLen - head);
if (res <= 0) return -1;
head += res;
res = prv_serializeValue(tlvP, buffer + head, bufferLen - head);
if (res < 0) return -1;
head += res;
break;
}
return head;
}
int lwm2m_json_serialize(int size,
lwm2m_data_t * tlvP,
uint8_t ** bufferP)
{
int index;
size_t head;
uint8_t bufferJSON[PRV_JSON_BUFFER_SIZE];
memcpy(bufferJSON, JSON_HEADER, JSON_HEADER_SIZE);
head = JSON_HEADER_SIZE;
// HACK START
if (tlvP->type == LWM2M_TYPE_OBJECT_INSTANCE)
{
if (size == 1)
{
size = tlvP->length;
tlvP = (lwm2m_data_t *)tlvP->value;
}
else return 0;
}
// HACK END
for (index = 0 ; index < size && head < PRV_JSON_BUFFER_SIZE ; index++)
{
int res;
// TODO: handle non-text format
switch (tlvP[index].type)
{
case LWM2M_TYPE_MULTIPLE_RESOURCE:
{
lwm2m_data_t * subTlvP;
size_t i;
subTlvP = (lwm2m_data_t *)tlvP[index].value;
for (i = 0 ; i < tlvP[index].length ; i++)
{
res = lwm2m_snprintf((char *)bufferJSON + head, PRV_JSON_BUFFER_SIZE - head, JSON_INST_ITEM_TEMPLATE, tlvP[index].id, subTlvP[i].id);
if (res <= 0 || res >= PRV_JSON_BUFFER_SIZE - head) return 0;
head += res;
res = prv_serializeValue(subTlvP + i, bufferJSON + head, PRV_JSON_BUFFER_SIZE -head);
if (res < 0) return -1;
head += res;
}
}
break;
case LWM2M_TYPE_RESOURCE:
res = lwm2m_snprintf((char *)bufferJSON + head, PRV_JSON_BUFFER_SIZE - head, JSON_RES_ITEM_TEMPLATE, tlvP[index].id);
if (res <= 0 || res >= PRV_JSON_BUFFER_SIZE - head) return 0;
head += res;
res = prv_serializeValue(tlvP + index, bufferJSON + head, PRV_JSON_BUFFER_SIZE -head);
if (res < 0) return 0;
head += res;
break;
case LWM2M_TYPE_OBJECT_INSTANCE:
// TODO: support this. Hacked for now.
break;
case LWM2M_TYPE_RESOURCE_INSTANCE:
default:
return 0;
break;
}
}
if (head + JSON_FOOTER_SIZE - 1 > PRV_JSON_BUFFER_SIZE) return -1;
memcpy(bufferJSON + head - 1, JSON_FOOTER, JSON_FOOTER_SIZE);
head = head - 1 + JSON_FOOTER_SIZE;
*bufferP = (uint8_t *)lwm2m_malloc(head);
if (*bufferP == NULL) return 0;
memcpy(*bufferP, bufferJSON, head);
return (int)head;
}
static int prv_serializeData(const lwm2m_data_t * tlvP,
const uint8_t * baseUriStr,
size_t baseUriLen,
uri_depth_t baseLevel,
const uint8_t * parentUriStr,
size_t parentUriLen,
uri_depth_t level,
bool *baseNameOutput,
uint8_t * buffer,
size_t bufferLen)
{
size_t head;
int res;
head = 0;
/* Check to override passed in level */
switch (tlvP->type)
{
case LWM2M_TYPE_MULTIPLE_RESOURCE:
level = URI_DEPTH_RESOURCE;
break;
case LWM2M_TYPE_OBJECT:
level = URI_DEPTH_OBJECT;
break;
case LWM2M_TYPE_OBJECT_INSTANCE:
level = URI_DEPTH_OBJECT_INSTANCE;
break;
default:
break;
}
switch (tlvP->type)
{
case LWM2M_TYPE_MULTIPLE_RESOURCE:
case LWM2M_TYPE_OBJECT:
case LWM2M_TYPE_OBJECT_INSTANCE:
{
uint8_t uriStr[URI_MAX_STRING_LEN];
size_t uriLen;
size_t index;
if (parentUriLen > 0)
{
if (URI_MAX_STRING_LEN < parentUriLen) return -1;
memcpy(uriStr, parentUriStr, parentUriLen);
uriLen = parentUriLen;
}
else
{
uriLen = 0;
}
res = utils_intToText(tlvP->id,
uriStr + uriLen,
URI_MAX_STRING_LEN - uriLen);
if (res <= 0) return -1;
uriLen += res;
uriStr[uriLen] = '/';
uriLen++;
head = 0;
for (index = 0 ; index < tlvP->value.asChildren.count; index++)
{
if (index != 0)
{
if (head + 1 > bufferLen) return 0;
buffer[head++] = JSON_SEPARATOR;
}
res = prv_serializeData(tlvP->value.asChildren.array + index,
baseUriStr,
baseUriLen,
baseLevel,
uriStr,
uriLen,
level,
baseNameOutput,
buffer + head,
bufferLen - head);
if (res < 0) return -1;
head += res;
}
}
break;
default:
head = 0;
if (bufferLen < 1) return -1;
buffer[head++] = JSON_ITEM_BEGIN;
if (!*baseNameOutput && baseUriLen > 0)
{
if (bufferLen - head < baseUriLen + JSON_BN_HEADER_SIZE + 2) return -1;
memcpy(buffer + head, JSON_BN_HEADER, JSON_BN_HEADER_SIZE);
head += JSON_BN_HEADER_SIZE;
memcpy(buffer + head, baseUriStr, baseUriLen);
head += baseUriLen;
buffer[head++] = JSON_ITEM_STRING_END;
buffer[head++] = JSON_SEPARATOR;
*baseNameOutput = true;
}
/* TODO: support base time */
if (!baseUriLen || level > baseLevel)
{
if (bufferLen - head < JSON_ITEM_URI_SIZE) return -1;
memcpy(buffer + head, JSON_ITEM_URI, JSON_ITEM_URI_SIZE);
head += JSON_ITEM_URI_SIZE;
if (parentUriLen > 0)
{
if (bufferLen - head < parentUriLen) return -1;
memcpy(buffer + head, parentUriStr, parentUriLen);
head += parentUriLen;
}
res = utils_intToText(tlvP->id, buffer + head, bufferLen - head);
if (res <= 0) return -1;
head += res;
if (bufferLen - head < 2) return -1;
buffer[head++] = JSON_ITEM_URI_END;
if (tlvP->type != LWM2M_TYPE_UNDEFINED)
{
buffer[head++] = JSON_SEPARATOR;
}
}
if (tlvP->type != LWM2M_TYPE_UNDEFINED)
{
res = prv_serializeValue(tlvP, buffer + head, bufferLen - head);
if (res < 0) return -1;
head += res;
}
/* TODO: support time */
if (bufferLen - head < 1) return -1;
buffer[head++] = JSON_ITEM_END;
break;
}
return (int)head;
}