QIODevice: rework validation policy for read() functions

- avoid calls to private and virtual functions, if the device is not
  open;
- avoid repetitive checks in loops;
- add missing checks in readLine() overloads;
- remove check against unsuccessful resize().

Change-Id: I973d5931163b25db1c09c7c3b66f29ea90bb1b29
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/corelib/io/qiodevice_p.h b/src/corelib/io/qiodevice_p.h
index 3639418bbc..83c16eeddc 100644
--- a/src/corelib/io/qiodevice_p.h
+++ b/src/corelib/io/qiodevice_p.h
@@ -180,6 +180,7 @@ public:
     void setWriteChannelCount(int count);
 
     qint64 read(char *data, qint64 maxSize, bool peeking = false);
+    qint64 readLine(char *data, qint64 maxSize);
     virtual qint64 peek(char *data, qint64 maxSize);
     virtual QByteArray peek(qint64 maxSize);
     qint64 skipByReading(qint64 maxSize);