Add Qt libs and headers

paho-mqtt3as-proxy/Qt/include/QtCore/qbuffer.h

@@ -0,0 +1,68 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef QBUFFER_H
+#define QBUFFER_H
+
+#include <QtCore/qiodevice.h>
+#include <QtCore/qbytearray.h>
+
+QT_BEGIN_NAMESPACE
+
+class QObject;
+class QBufferPrivate;
+
+class Q_CORE_EXPORT QBuffer : public QIODevice
+{
+#ifndef QT_NO_QOBJECT
+    Q_OBJECT
+#endif
+
+public:
+#ifndef QT_NO_QOBJECT
+    explicit QBuffer(QObject *parent = nullptr);
+    QBuffer(QByteArray *buf, QObject *parent = nullptr);
+#else
+    QBuffer();
+    explicit QBuffer(QByteArray *buf);
+#endif
+    ~QBuffer();
+
+    QByteArray &buffer();
+    const QByteArray &buffer() const;
+    void setBuffer(QByteArray *a);
+
+    void setData(const QByteArray &data);
+#if QT_CORE_REMOVED_SINCE(6, 5) && QT_POINTER_SIZE != 4
+    void setData(const char *data, int len) { setData(data, qsizetype(len)); }
+#endif
+    void setData(const char *data, qsizetype len);
+    const QByteArray &data() const;
+
+    bool open(OpenMode openMode) override;
+
+    void close() override;
+    qint64 size() const override;
+    qint64 pos() const override;
+    bool seek(qint64 off) override;
+    bool atEnd() const override;
+    bool canReadLine() const override;
+
+protected:
+#ifndef QT_NO_QOBJECT
+    void connectNotify(const QMetaMethod &) override;
+    void disconnectNotify(const QMetaMethod &) override;
+#endif
+    qint64 readData(char *data, qint64 maxlen) override;
+    qint64 writeData(const char *data, qint64 len) override;
+
+private:
+    Q_DECLARE_PRIVATE(QBuffer)
+    Q_DISABLE_COPY(QBuffer)
+
+    Q_PRIVATE_SLOT(d_func(), void _q_emitSignals())
+};
+
+QT_END_NAMESPACE
+
+#endif // QBUFFER_H