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/corelib/io/qiodevice_p.h b/src/corelib/io/qiodevice_p.h
index da46b983cd..d8e12d7259 100644
--- a/src/corelib/io/qiodevice_p.h
+++ b/src/corelib/io/qiodevice_p.h
@@ -175,8 +175,6 @@ public:
     virtual qint64 peek(char *data, qint64 maxSize);
     virtual QByteArray peek(qint64 maxSize);
     qint64 skipByReading(qint64 maxSize);
-    // ### Qt6: consider replacing with a protected virtual QIODevice::skipData().
-    virtual qint64 skip(qint64 maxSize);
 
 #ifdef QT_NO_QOBJECT
     QIODevice *q_ptr;