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, 5 insertions, 5 deletions

diff --git a/src/network/socket/qlocalsocket_unix.cpp b/src/network/socket/qlocalsocket_unix.cpp
index 52067a265c..6fd17a6213 100644
--- a/src/network/socket/qlocalsocket_unix.cpp
+++ b/src/network/socket/qlocalsocket_unix.cpp
@@ -87,11 +87,6 @@ void QLocalSocketPrivate::init()
     unixSocket.setParent(q);
 }
 
-qint64 QLocalSocketPrivate::skip(qint64 maxSize)
-{
-    return unixSocket.skip(maxSize);
-}
-
 void QLocalSocketPrivate::_q_errorOccurred(QAbstractSocket::SocketError socketError)
 {
     Q_Q(QLocalSocket);
@@ -398,6 +393,11 @@ qint64 QLocalSocket::readData(char *data, qint64 c)
     return d->unixSocket.read(data, c);
 }
 
+qint64 QLocalSocket::skipData(qint64 maxSize)
+{
+    return d_func()->unixSocket.skip(maxSize);
+}
+
 qint64 QLocalSocket::writeData(const char *data, qint64 c)
 {
     Q_D(QLocalSocket);