Id 30000 c++

[Fortera Global]

for what is this, to limit something? in items.cpp

switch (attrib) {
                case ITEM_ATTR_SERVERID: {
                    if (datalen != sizeof(uint16_t)) {
                        return ERROR_INVALID_FORMAT;
                    }

                    if (!stream.read<uint16_t>(serverId)) {
                        return ERROR_INVALID_FORMAT;
                    }

                    if (serverId > 30000 && serverId < 30100) {
                        serverId -= 30000;
                    }
                    break;
                }

void Items::buildInventoryList()
{
     inventory.reserve(30000);
     for(const auto &type: items) {
         if(type.weaponType != WEAPON_NONE || type.ammoType != AMMO_NONE ||
             type.attack != 0 || type.defense != 0 ||
             type.extraDefense != 0 || type.armor != 0 ||
             (type.slotPosition & SLOTP_NECKLACE) == SLOTP_NECKLACE ||
             (type.slotPosition & SLOTP_RING) == SLOTP_RING ||
             (type.slotPosition & SLOTP_AMMO) == SLOTP_AMMO ||
             (type.slotPosition & SLOTP_FEET) == SLOTP_FEET ||
             (type.slotPosition & SLOTP_HEAD) == SLOTP_HEAD ||
             (type.slotPosition & SLOTP_ARMOR) == SLOTP_ARMOR ||
             (type.slotPosition & SLOTP_LEGS) == SLOTP_LEGS)
         {
             inventory.push_back(type.clientId);
         }
     }
     inventory.shrink_to_fit();
     std::sort(inventory.begin(), inventory.end());
}

void Items::parseItemNode(const pugi::xml_node& itemNode, uint16_t id)
{
    if (id > 30000 && id < 30100) {
        id -= 30000;

tfs 1.2