A proposal for making the memory copy functions build with g++3.4.2.

Please review the patch, specially the casts it makes, and also
the boundaries and sizes.

-Shouldn't we use unsigned char* instead of char*. For arm it is already unsigned?
-Check again the casts

1 files changed, 38 insertions, 10 deletions

diff --git a/noncore/multimedia/opieplayer2/xinevideowidget.cpp b/noncore/multimedia/opieplayer2/xinevideowidget.cpp
index b55750a..15c611f 100644
--- a/noncore/multimedia/opieplayer2/xinevideowidget.cpp
+++ b/noncore/multimedia/opieplayer2/xinevideowidget.cpp
@@ -17,96 +17,124 @@
     .i_,=:_.      -<s.       This program is distributed in the hope that
      +  .  -:.       =       it will be useful,  but WITHOUT ANY WARRANTY;
     : ..    .:,     . . .    without even the implied warranty of
     =_        +     =;=|`    MERCHANTABILITY or FITNESS FOR A
   _.=:.       :    :=>`:     PARTICULAR PURPOSE. See the GNU
 ..}^=.=       =       ;      Library General Public License for more
 ++=   -.     .`     .:       details.
  :     =  ...= . :.=-
  -.   .:....=;==+<;          You should have received a copy of the GNU
   -_. . .   )=.  =           Library General Public License along with
     --        :-=`           this library; see the file COPYING.LIB.
                              If not, write to the Free Software Foundation,
                              Inc., 59 Temple Place - Suite 330,
                              Boston, MA 02111-1307, USA.
 
 */
 
 #include <qimage.h>
 #include <qdirectpainter_qws.h>
 #include <qgfx_qws.h>
 #include <qsize.h>
 #include <qapplication.h>
 
 #include <qpe/resource.h>
 
 #include "xinevideowidget.h"
 
 
 // 0 deg rot: copy a line from src to dst (use libc memcpy)
 
 // 180 deg rot: copy a line from src to dst reversed
 
-static inline void memcpy_rev ( void *dst, void *src, size_t len )
+/*
+ * This code relies the len be a multiply of 16bit
+ */
+static inline void memcpy_rev ( void *_dst, void *_src, size_t len )
 {
+    /*
+     * move the source to the end
+     */
+    char *src_c = static_cast<char*>(_src) + len;
+
+    /*
+     * as we copy by 16bit and not 8bit
+     * devide the length by two
+     */
 	len >>= 1;
 
-	((char *) src ) += ( len << 1 );
+    short int* dst = static_cast<short int*>( _dst );
+    short int* src = reinterpret_cast<short int*>( src_c );
 
+    /*
+     * Increment dst after assigning
+     * Decrement src before  assigning becase we move backwards
+     */
 	while ( len-- )
-		*((short int *) dst )++ = *--((short int *) src );
+        *dst++ = *--src;
+
 }
 
 // 90 deg rot: copy a column from src to dst
 
-static inline void memcpy_step ( void *dst, void *src, size_t len, size_t step )
+static inline void memcpy_step ( void *_dst, void *_src, size_t len, size_t step )
 {
+    short int *dst = static_cast<short int*>( _dst );
+    short int *src = static_cast<short int*>( _src );
+
 	len >>= 1;
+
+    /*
+     * Copy 16bit from src to dst and move to the next address
+     */
 	while ( len-- ) {
-		*((short int *) dst )++ = *((short int *) src );
-		((char *) src ) += step;
+        *dst++ = *src;
+        src = reinterpret_cast<short int*>(reinterpret_cast<char*>(src)+step);
 	}
 }
 
 // 270 deg rot: copy a column from src to dst reversed
 
-static inline void memcpy_step_rev ( void *dst, void *src, size_t len, size_t step )
+static inline void memcpy_step_rev ( void *_dst, void *_src, size_t len, size_t step )
 {
 	len >>= 1;
 
-	((char *) src ) += ( len * step );
+    char *src_c = static_cast<char*>( _src ) + (len*step);
+    short int* dst = static_cast<short int*>( _dst );
+    short int* src = reinterpret_cast<short int*>( src_c );
 
 	while ( len-- ) {
-		((char *) src ) -= step;
-		*((short int *) dst )++ = *((short int *) src );
+        src_c -= step;
+        src = reinterpret_cast<short int*>( src_c );
+        *dst++ = *src;
 	}
 }
 
 
 XineVideoWidget::XineVideoWidget ( QWidget* parent, const char* name )
 	: QWidget ( parent, name, WRepaintNoErase | WResizeNoErase )
 {
 	setBackgroundMode ( NoBackground );
 
 	m_logo              = 0;
 	m_buff              = 0;
 	m_bytes_per_line_fb = qt_screen-> linestep ( );
 	m_bytes_per_pixel   = ( qt_screen->depth() + 7 ) / 8;
 	m_rotation          = 0;
 }
 
 
 XineVideoWidget::~XineVideoWidget ( )
 {
 	delete m_logo;
 }
 
 void XineVideoWidget::clear ( )
 {
 	m_buff = 0;
 	repaint ( false );
 }
 
 QSize XineVideoWidget::videoSize() const
 {
     QSize s = size();
     bool fs = ( s == qApp->desktop()->size() );