Updated codebase to work with Qt6 out of the box

The only change needed was to the sample TestEchoClientServer.cpp
application to not use deprecated QRegExp but instead use the newer
QRegularExpression (which is supported in Qt5 as well).

Since most of the codebase relies simply on low-level types such as
QByteArray and QTcpSocket -- and since these are largely unchanged from
Qt5 to Qt6 -- there doesn't appear to be any issue using WebSocket.cpp
in Qt6.

Author: cculianu

README.md

@@ -1,6 +1,6 @@
 # Web Socket
 
-A lightweight RFC 6455 (Web Socket) implementation for Qt5 by Calin Culianu <calin.culianu@gmail.com>
+A lightweight RFC 6455 (Web Socket) implementation for Qt5 & Qt6 by Calin Culianu <calin.culianu@gmail.com>
 
 Key highlights:
   - Supports both `ws://` and `wss://` Web Sockets.

examples/TestEchoClientServer.cpp

@@ -1,7 +1,7 @@
 #include "../WebSocket.h"
 #include <QFile>
 #include <QHostAddress>
-#include <QRegExp>
+#include <QRegularExpression>
 #include <QTcpServer>
 #include <QSslCertificate>
 #include <QSslConfiguration>
@@ -61,13 +61,14 @@ int main(int argc, char *argv[])
         // stand alone test encoding / decoding
         std::cout << "Enter text:\n";
         std::array<char, 65536> linebuf;
-        const QRegExp hexRE("^[0-9a-fA-F]+$");
+        const QRegularExpression hexRE("^[0-9a-fA-F]+$");
         while ( std::cin.getline(linebuf.data(), linebuf.size()) ) {
             QByteArray b = QByteArray(linebuf.data()).trimmed();
             QByteArray frameData;
 
             try {
-                if (hexRE.exactMatch(b)) {
+                if (hexRE.match(b).hasMatch()) {
+                    // input was some hex encoded data
                     frameData = QByteArray::fromHex(b);
                 } else {
                     frameData = WebSocket::Ser::wrapText(b, true, 260);
@@ -300,7 +301,7 @@ int main(int argc, char *argv[])
                         qDebug("Got text frame [%s], echoing back", f.payload.constData());
                         sock->sendText(QByteArray("ECHO ") + f.payload);
                     } else {
-                        qDebug("Got data frame [%d bytes], echoing back", f.payload.size());
+                        qDebug("Got data frame [%d bytes], echoing back", int(f.payload.size()));
                         sock->sendBinary(f.payload);
                     }
                 }