QNonContiguousByteDevice: roll back complete internal state in reset()

... otherwise we would not start reading from the beginning when the
device was reset.

Change-Id: I897adbad6e1f240fa871758ec7e3d6b499cb5944
(cherry-picked from commit ffe45f1896adfff93258b917f6a566dcc06a6597)
Reviewed-by: Shane Kearns <shane.kearns@accenture.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/corelib/io/qnoncontiguousbytedevice.cpp b/src/corelib/io/qnoncontiguousbytedevice.cpp
index 904337b..724ba22 100644
--- a/src/corelib/io/qnoncontiguousbytedevice.cpp
+++ b/src/corelib/io/qnoncontiguousbytedevice.cpp
@@ -393,6 +393,12 @@ bool QNonContiguousByteDeviceIoDeviceImpl::reset()
     if (device->seek(initialPosition)) {
         eof = false; // assume eof is false, it will be true after a read has been attempted
         totalAdvancements = 0; //reset the progress counter
+        if (currentReadBuffer) {
+            delete currentReadBuffer;
+            currentReadBuffer = 0;
+        }
+        currentReadBufferAmount = 0;
+        currentReadBufferPosition = 0;
         return true;
     }