Introduce QIODevice::skipData()

QIODevice::skip() called a virtual QIODevicePrivate::skip() to
implement an efficient skipping on I/O devices for the internal
subclasses. The user subclasses cannot inherit QIODevicePrivate, so
this functionality was not externally accessible.

This patch replaces QIODevicePrivate::skip() with a virtual protected
QIODevice::skipData(). While the basic implementation simply discards
the data by reading into a dummy buffer, users can reimplement this
function to improve the performance in their subclasses.

[ChangeLog][QtCore][QIODevice] Added virtual protected skipData().
Now, subclasses can implement device-specific skipping of data.

Change-Id: I9522f7f7ab9d03ac06e972a525f8ec2fa909a617
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

1 files changed, 0 insertions, 2 deletions

diff --git a/src/network/socket/qlocalsocket_p.h b/src/network/socket/qlocalsocket_p.h
index 0e05e4c5d7..7eff502607 100644
--- a/src/network/socket/qlocalsocket_p.h
+++ b/src/network/socket/qlocalsocket_p.h
@@ -120,7 +120,6 @@ public:
     void init();
 
 #if defined(QT_LOCALSOCKET_TCP)
-    qint64 skip(qint64 maxSize) override;
     QLocalUnixSocket* tcpSocket;
     bool ownsTcpSocket;
     void setSocket(QLocalUnixSocket*);
@@ -139,7 +138,6 @@ public:
     QWindowsPipeReader *pipeReader;
     QLocalSocket::LocalSocketError error;
 #else
-    qint64 skip(qint64 maxSize) override;
     QLocalUnixSocket unixSocket;
     QString generateErrorString(QLocalSocket::LocalSocketError, const QString &function) const;
     void setErrorAndEmit(QLocalSocket::LocalSocketError, const QString &function);