Optimise the memory use

lib/network/tcprelay.cpp

@@ -201,8 +201,15 @@ void TcpRelay::onRemoteTcpSocketError()
 
 void TcpRelay::onLocalTcpSocketReadyRead()
 {
-    const QByteArray _data = local->readAll();
-    std::string data(_data.data(), _data.size());
+    std::string data;
+    data.resize(RemoteRecvSize);
+    int64_t readSize = local->read(&data[0], data.size());
+    if (readSize == -1) {
+        qCritical("Attempted to read from closed local socket.");
+        close();
+        return;
+    }
+    data.resize(readSize);
 
     if (data.empty()) {
         qCritical("Local received empty data.");
@@ -256,8 +263,16 @@ void TcpRelay::onLocalTcpSocketReadyRead()
 
 void TcpRelay::onRemoteTcpSocketReadyRead()
 {
-    QByteArray _buf = remote->readAll();
-    std::string buf(_buf.data(), _buf.size());
+    std::string buf;
+    buf.resize(RemoteRecvSize);
+    int64_t readSize = remote->read(&buf[0], buf.size());
+    if (readSize == -1) {
+        qCritical("Attempted to read from closed remote socket.");
+        close();
+        return;
+    }
+    buf.resize(readSize);
+
     if (buf.empty()) {
         qWarning("Remote received empty data.");
         close();

lib/types/address.cpp

@@ -70,11 +70,10 @@ uint16_t Address::getPort() const
     return data.second;
 }
 
-void Address::lookUp(const Address::LookUpCallback& cb)
+void Address::lookUp(Address::LookUpCallback cb)
 {
     if (isIPValid()) {
-        cb(true);
-        return;
+        return cb(true);
     }
     std::shared_ptr<QDnsLookup> dns(new QDnsLookup(QDnsLookup::Type::ANY, QString::fromStdString(data.first)));
     QObject::connect(dns.get(), &QDnsLookup::finished,

lib/types/address.h

@@ -80,7 +80,7 @@ class QSS_EXPORT Address
      * Looks up the network address if the address is a domain name.
      * The callback is invoked whenever the operation is finished.
      */
-    void lookUp(const LookUpCallback&);
+    void lookUp(LookUpCallback);
 
     /**
      * @brief blockingLookUp