bool UpdateData::buildPacket(WorldPacket& packet, bool hasTransport) { ByteBuffer buf(m_data.size() + 10 + m_guidList.size() * 8); buf << (u_int)(!m_guidList.empty() ? m_blockCount + 1 : m_blockCount); buf << (u_char)(hasTransport ? 1 : 0); if (!m_guidList.empty()) { buf << (u_char)UPDATETYPE_OUT_OF_RANGE_OBJECTS; buf << (u_int)m_guidList.size(); for (IDList::const_iterator itr = m_guidList.begin(); itr != m_guidList.end(); ++itr) { buf << (u_char)0xFF; buf << (u_int64)*itr; } } buf.append(m_data); packet.clear(); // 大小超过50字节的数据包要压缩 if (m_data.size() > 50) { u_int destSize = (u_int)buf.size() + buf.size() / 10 + 16; packet.resize(destSize); packet.put(0, (u_int)buf.size()); compress(const_cast<u_char*>(packet.contents()) + sizeof(u_int), &destSize, (void*)buf.contents(), (u_int)buf.size()); if (destSize == 0) return false; packet.resize(destSize + sizeof(u_int)); packet.setOpcode(SMSG_COMPRESSED_UPDATE_OBJECT); } else { packet.append(buf); packet.setOpcode(SMSG_UPDATE_OBJECT); } return true; }