Merge branch 'kinetic-declarativeui' of git@scm.dev.nokia.troll.no:qt/kinetic into kinetic-declarativeui

84 files changed, 3059 insertions, 1589 deletions

diff --git a/src/corelib/arch/qatomic_mips.h b/src/corelib/arch/qatomic_mips.h
index b263aab..ea9954b 100644
--- a/src/corelib/arch/qatomic_mips.h
+++ b/src/corelib/arch/qatomic_mips.h
@@ -103,16 +103,25 @@ Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::isFetchAndAddWaitFree()
 
 #if defined(Q_CC_GNU) && !defined(Q_OS_IRIX)
 
+#if _MIPS_SIM == _ABIO32
+#define SET_MIPS2 ".set mips2\n\t"
+#else
+#define SET_MIPS2
+#endif
+
 inline bool QBasicAtomicInt::ref()
 {
     register int originalValue;
     register int newValue;
-    asm volatile("0:\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "0:\n"
                  "ll %[originalValue], %[_q_value]\n"
                  "addiu %[newValue], %[originalValue], %[one]\n"
                  "sc %[newValue], %[_q_value]\n"
                  "beqz %[newValue], 0b\n"
                  "nop\n"
+                 ".set pop\n"
                  : [originalValue] "=&r" (originalValue),
                    [_q_value] "+m" (_q_value),
                    [newValue] "=&r" (newValue)
@@ -125,12 +134,15 @@ inline bool QBasicAtomicInt::deref()
 {
     register int originalValue;
     register int newValue;
-    asm volatile("0:\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "0:\n"
                  "ll %[originalValue], %[_q_value]\n"
                  "addiu %[newValue], %[originalValue], %[minusOne]\n"
                  "sc %[newValue], %[_q_value]\n"
                  "beqz %[newValue], 0b\n"
                  "nop\n"
+                 ".set pop\n"
                  : [originalValue] "=&r" (originalValue),
                    [_q_value] "+m" (_q_value),
                    [newValue] "=&r" (newValue)
@@ -143,7 +155,9 @@ inline bool QBasicAtomicInt::testAndSetRelaxed(int expectedValue, int newValue)
 {
     register int result;
     register int tempValue;
-    asm volatile("0:\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "0:\n"
                  "ll %[result], %[_q_value]\n"
                  "xor %[result], %[result], %[expectedValue]\n"
                  "bnez %[result], 0f\n"
@@ -153,6 +167,7 @@ inline bool QBasicAtomicInt::testAndSetRelaxed(int expectedValue, int newValue)
                  "beqz %[tempValue], 0b\n"
                  "nop\n"
                  "0:\n"
+                 ".set pop\n"
                  : [result] "=&r" (result),
                    [tempValue] "=&r" (tempValue),
                    [_q_value] "+m" (_q_value)
@@ -166,7 +181,9 @@ inline bool QBasicAtomicInt::testAndSetAcquire(int expectedValue, int newValue)
 {
     register int result;
     register int tempValue;
-    asm volatile("0:\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "0:\n"
                  "ll %[result], %[_q_value]\n"
                  "xor %[result], %[result], %[expectedValue]\n"
                  "bnez %[result], 0f\n"
@@ -177,6 +194,7 @@ inline bool QBasicAtomicInt::testAndSetAcquire(int expectedValue, int newValue)
                  "nop\n"
                  "sync\n"
                  "0:\n"
+                 ".set pop\n"
                  : [result] "=&r" (result),
                    [tempValue] "=&r" (tempValue),
                    [_q_value] "+m" (_q_value)
@@ -190,7 +208,9 @@ inline bool QBasicAtomicInt::testAndSetRelease(int expectedValue, int newValue)
 {
     register int result;
     register int tempValue;
-    asm volatile("sync\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "sync\n"
                  "0:\n"
                  "ll %[result], %[_q_value]\n"
                  "xor %[result], %[result], %[expectedValue]\n"
@@ -201,6 +221,7 @@ inline bool QBasicAtomicInt::testAndSetRelease(int expectedValue, int newValue)
                  "beqz %[tempValue], 0b\n"
                  "nop\n"
                  "0:\n"
+                 ".set pop\n"
                  : [result] "=&r" (result),
                    [tempValue] "=&r" (tempValue),
                    [_q_value] "+m" (_q_value)
@@ -219,12 +240,15 @@ inline int QBasicAtomicInt::fetchAndStoreRelaxed(int newValue)
 {
     register int originalValue;
     register int tempValue;
-    asm volatile("0:\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "0:\n"
                  "ll %[originalValue], %[_q_value]\n"
                  "move %[tempValue], %[newValue]\n"
                  "sc %[tempValue], %[_q_value]\n"
                  "beqz %[tempValue], 0b\n"
                  "nop\n"
+                 ".set pop\n"
                  : [originalValue] "=&r" (originalValue),
                    [tempValue] "=&r" (tempValue),
                    [_q_value] "+m" (_q_value)
@@ -237,13 +261,16 @@ inline int QBasicAtomicInt::fetchAndStoreAcquire(int newValue)
 {
     register int originalValue;
     register int tempValue;
-    asm volatile("0:\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "0:\n"
                  "ll %[originalValue], %[_q_value]\n"
                  "move %[tempValue], %[newValue]\n"
                  "sc %[tempValue], %[_q_value]\n"
                  "beqz %[tempValue], 0b\n"
                  "nop\n"
                  "sync\n"
+                 ".set pop\n"
                  : [originalValue] "=&r" (originalValue),
                    [tempValue] "=&r" (tempValue),
                    [_q_value] "+m" (_q_value)
@@ -256,13 +283,16 @@ inline int QBasicAtomicInt::fetchAndStoreRelease(int newValue)
 {
     register int originalValue;
     register int tempValue;
-    asm volatile("sync\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "sync\n"
                  "0:\n"
                  "ll %[originalValue], %[_q_value]\n"
                  "move %[tempValue], %[newValue]\n"
                  "sc %[tempValue], %[_q_value]\n"
                  "beqz %[tempValue], 0b\n"
                  "nop\n"
+                 ".set pop\n"
                  : [originalValue] "=&r" (originalValue),
                    [tempValue] "=&r" (tempValue),
                    [_q_value] "+m" (_q_value)
@@ -280,12 +310,15 @@ inline int QBasicAtomicInt::fetchAndAddRelaxed(int valueToAdd)
 {
     register int originalValue;
     register int newValue;
-    asm volatile("0:\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "0:\n"
                  "ll %[originalValue], %[_q_value]\n"
                  "addu %[newValue], %[originalValue], %[valueToAdd]\n"
                  "sc %[newValue], %[_q_value]\n"
                  "beqz %[newValue], 0b\n"
                  "nop\n"
+                 ".set pop\n"
                  : [originalValue] "=&r" (originalValue),
                    [_q_value] "+m" (_q_value),
                    [newValue] "=&r" (newValue)
@@ -298,13 +331,16 @@ inline int QBasicAtomicInt::fetchAndAddAcquire(int valueToAdd)
 {
     register int originalValue;
     register int newValue;
-    asm volatile("0:\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "0:\n"
                  "ll %[originalValue], %[_q_value]\n"
                  "addu %[newValue], %[originalValue], %[valueToAdd]\n"
                  "sc %[newValue], %[_q_value]\n"
                  "beqz %[newValue], 0b\n"
                  "nop\n"
                  "sync\n"
+                 ".set pop\n"
                  : [originalValue] "=&r" (originalValue),
                    [_q_value] "+m" (_q_value),
                    [newValue] "=&r" (newValue)
@@ -317,13 +353,16 @@ inline int QBasicAtomicInt::fetchAndAddRelease(int valueToAdd)
 {
     register int originalValue;
     register int newValue;
-    asm volatile("sync\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "sync\n"
                  "0:\n"
                  "ll %[originalValue], %[_q_value]\n"
                  "addu %[newValue], %[originalValue], %[valueToAdd]\n"
                  "sc %[newValue], %[_q_value]\n"
                  "beqz %[newValue], 0b\n"
                  "nop\n"
+                 ".set pop\n"
                  : [originalValue] "=&r" (originalValue),
                    [_q_value] "+m" (_q_value),
                    [newValue] "=&r" (newValue)
@@ -350,7 +389,9 @@ Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetRelaxed(T *expectedValu
 {
     register T *result;
     register T *tempValue;
-    asm volatile("0:\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "0:\n"
                  LLP" %[result], %[_q_value]\n"
                  "xor %[result], %[result], %[expectedValue]\n"
                  "bnez %[result], 0f\n"
@@ -360,6 +401,7 @@ Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetRelaxed(T *expectedValu
                  "beqz %[tempValue], 0b\n"
                  "nop\n"
                  "0:\n"
+                 ".set pop\n"
                  : [result] "=&r" (result),
                    [tempValue] "=&r" (tempValue),
                    [_q_value] "+m" (_q_value)
@@ -374,7 +416,9 @@ Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetAcquire(T *expectedValu
 {
     register T *result;
     register T *tempValue;
-    asm volatile("0:\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "0:\n"
                  LLP" %[result], %[_q_value]\n"
                  "xor %[result], %[result], %[expectedValue]\n"
                  "bnez %[result], 0f\n"
@@ -385,6 +429,7 @@ Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetAcquire(T *expectedValu
                  "nop\n"
                  "sync\n"
                  "0:\n"
+                 ".set pop\n"
                  : [result] "=&r" (result),
                    [tempValue] "=&r" (tempValue),
                    [_q_value] "+m" (_q_value)
@@ -399,7 +444,9 @@ Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetRelease(T *expectedValu
 {
     register T *result;
     register T *tempValue;
-    asm volatile("sync\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "sync\n"
                  "0:\n"
                  LLP" %[result], %[_q_value]\n"
                  "xor %[result], %[result], %[expectedValue]\n"
@@ -410,6 +457,7 @@ Q_INLINE_TEMPLATE bool QBasicAtomicPointer<T>::testAndSetRelease(T *expectedValu
                  "beqz %[tempValue], 0b\n"
                  "nop\n"
                  "0:\n"
+                 ".set pop\n"
                  : [result] "=&r" (result),
                    [tempValue] "=&r" (tempValue),
                    [_q_value] "+m" (_q_value)
@@ -430,12 +478,15 @@ Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreRelaxed(T *newValue)
 {
     register T *originalValue;
     register T *tempValue;
-    asm volatile("0:\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "0:\n"
                  LLP" %[originalValue], %[_q_value]\n"
                  "move %[tempValue], %[newValue]\n"
                  SCP" %[tempValue], %[_q_value]\n"
                  "beqz %[tempValue], 0b\n"
                  "nop\n"
+                 ".set pop\n"
                  : [originalValue] "=&r" (originalValue),
                    [tempValue] "=&r" (tempValue),
                    [_q_value] "+m" (_q_value)
@@ -449,13 +500,16 @@ Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreAcquire(T *newValue)
 {
     register T *originalValue;
     register T *tempValue;
-    asm volatile("0:\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "0:\n"
                  LLP" %[originalValue], %[_q_value]\n"
                  "move %[tempValue], %[newValue]\n"
                  SCP" %[tempValue], %[_q_value]\n"
                  "beqz %[tempValue], 0b\n"
                  "nop\n"
                  "sync\n"
+                 ".set pop\n"
                  : [originalValue] "=&r" (originalValue),
                    [tempValue] "=&r" (tempValue),
                    [_q_value] "+m" (_q_value)
@@ -469,13 +523,16 @@ Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndStoreRelease(T *newValue)
 {
     register T *originalValue;
     register T *tempValue;
-    asm volatile("sync\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "sync\n"
                  "0:\n"
                  LLP" %[originalValue], %[_q_value]\n"
                  "move %[tempValue], %[newValue]\n"
                  SCP" %[tempValue], %[_q_value]\n"
                  "beqz %[tempValue], 0b\n"
                  "nop\n"
+                 ".set pop\n"
                  : [originalValue] "=&r" (originalValue),
                    [tempValue] "=&r" (tempValue),
                    [_q_value] "+m" (_q_value)
@@ -495,12 +552,15 @@ Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddRelaxed(qptrdiff valueTo
 {
     register T *originalValue;
     register T *newValue;
-    asm volatile("0:\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "0:\n"
                  LLP" %[originalValue], %[_q_value]\n"
                  "addu %[newValue], %[originalValue], %[valueToAdd]\n"
                  SCP" %[newValue], %[_q_value]\n"
                  "beqz %[newValue], 0b\n"
                  "nop\n"
+                 ".set pop\n"
                  : [originalValue] "=&r" (originalValue),
                    [_q_value] "+m" (_q_value),
                    [newValue] "=&r" (newValue)
@@ -514,13 +574,16 @@ Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddAcquire(qptrdiff valueTo
 {
     register T *originalValue;
     register T *newValue;
-    asm volatile("0:\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "0:\n"
                  LLP" %[originalValue], %[_q_value]\n"
                  "addu %[newValue], %[originalValue], %[valueToAdd]\n"
                  SCP" %[newValue], %[_q_value]\n"
                  "beqz %[newValue], 0b\n"
                  "nop\n"
                  "sync\n"
+                 ".set pop\n"
                  : [originalValue] "=&r" (originalValue),
                    [_q_value] "+m" (_q_value),
                    [newValue] "=&r" (newValue)
@@ -534,13 +597,16 @@ Q_INLINE_TEMPLATE T *QBasicAtomicPointer<T>::fetchAndAddRelease(qptrdiff valueTo
 {
     register T *originalValue;
     register T *newValue;
-    asm volatile("sync\n"
+    asm volatile(".set push\n"
+                 SET_MIPS2
+                 "sync\n"
                  "0:\n"
                  LLP" %[originalValue], %[_q_value]\n"
                  "addu %[newValue], %[originalValue], %[valueToAdd]\n"
                  SCP" %[newValue], %[_q_value]\n"
                  "beqz %[newValue], 0b\n"
                  "nop\n"
+                 ".set pop\n"
                  : [originalValue] "=&r" (originalValue),
                    [_q_value] "+m" (_q_value),
                    [newValue] "=&r" (newValue)
diff --git a/src/corelib/concurrent/qfuturewatcher.cpp b/src/corelib/concurrent/qfuturewatcher.cpp
index ea35e9e..39d7698 100644
--- a/src/corelib/concurrent/qfuturewatcher.cpp
+++ b/src/corelib/concurrent/qfuturewatcher.cpp
@@ -465,7 +465,7 @@ void QFutureWatcherBasePrivate::sendCallOutEvent(QFutureCallOutEvent *event)
                 break;
 
             emit q->progressValueChanged(event->index1);
-            if (event->text != QString()) // ###
+            if (!event->text.isNull()) // ###
                 q->progressTextChanged(event->text);
         break;
         case QFutureCallOutEvent::ProgressRange:
diff --git a/src/corelib/io/io.pri b/src/corelib/io/io.pri
index 3690d4b..8f37e25 100644
--- a/src/corelib/io/io.pri
+++ b/src/corelib/io/io.pri
@@ -10,9 +10,9 @@ HEADERS +=  \
         io/qdiriterator.h \
         io/qfile.h \
         io/qfileinfo.h \
-        io/qfileinfo_p.h \
         io/qiodevice.h \
         io/qiodevice_p.h \
+        io/qnoncontiguousbytedevice_p.h \
         io/qprocess.h \
         io/qprocess_p.h \
         io/qtextstream.h \
@@ -38,6 +38,7 @@ SOURCES += \
         io/qfile.cpp \
         io/qfileinfo.cpp \
         io/qiodevice.cpp \
+        io/qnoncontiguousbytedevice.cpp \
         io/qprocess.cpp \
         io/qtextstream.cpp \
         io/qtemporaryfile.cpp \
diff --git a/src/corelib/io/qdebug.h b/src/corelib/io/qdebug.h
index 8334146..9b0fbe5 100644
--- a/src/corelib/io/qdebug.h
+++ b/src/corelib/io/qdebug.h
@@ -51,6 +51,7 @@
 #include <QtCore/qstring.h>
 #include <QtCore/qvector.h>
 #include <QtCore/qset.h>
+#include <QtCore/qcontiguouscache.h>
 
 QT_BEGIN_HEADER
 
@@ -232,6 +233,24 @@ inline QDebug operator<<(QDebug debug, const QSet<T> &set)
     return operator<<(debug, set.toList());
 }
 
+#if defined(FORCE_UREF)
+template <class T>
+inline QDebug &operator<<(QDebug debug, const QContiguousCache<T> &cache)
+#else
+template <class T>
+inline QDebug operator<<(QDebug debug, const QContiguousCache<T> &cache)
+#endif
+{
+    debug.nospace() << "QContiguousCache(";
+    for (int i = cache.firstIndex(); i <= cache.lastIndex(); ++i) {
+        debug << cache[i];
+        if (i != cache.lastIndex())
+            debug << ", ";
+    }
+    debug << ")";
+    return debug.space();
+}
+
 #if !defined(QT_NO_DEBUG_STREAM)
 Q_CORE_EXPORT_INLINE QDebug qDebug() { return QDebug(QtDebugMsg); }
 
diff --git a/src/corelib/io/qfileinfo_p.h b/src/corelib/io/qfileinfo_p.h
deleted file mode 100644
index 7d66581..0000000
--- a/src/corelib/io/qfileinfo_p.h
+++ /dev/null
@@ -1,145 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
-** Contact: Qt Software Information (qt-info@nokia.com)
-**
-** This file is part of the QtCore module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** No Commercial Usage
-** This file contains pre-release code and may not be distributed.
-** You may use this file in accordance with the terms and conditions
-** contained in the either Technology Preview License Agreement or the
-** Beta Release License Agreement.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 2.1 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL included in the
-** packaging of this file.  Please review the following information to
-** ensure the GNU Lesser General Public License version 2.1 requirements
-** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
-**
-** In addition, as a special exception, Nokia gives you certain
-** additional rights. These rights are described in the Nokia Qt LGPL
-** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
-** package.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 3.0 as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL included in the
-** packaging of this file.  Please review the following information to
-** ensure the GNU General Public License version 3.0 requirements will be
-** met: http://www.gnu.org/copyleft/gpl.html.
-**
-** If you are unsure which license is appropriate for your use, please
-** contact the sales department at qt-sales@nokia.com.
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#ifndef QFILEINFO_P_H
-#define QFILEINFO_P_H
-
-//
-//  W A R N I N G
-//  -------------
-//
-// This file is not part of the Qt API.  It exists for the convenience
-// of QIODevice. This header file may change from version to
-// version without notice, or even be removed.
-//
-// We mean it.
-//
-
-#include "qfileinfo.h"
-
-QT_BEGIN_NAMESPACE
-
-class QFileInfoPrivate
-{
-public:
-    QFileInfoPrivate(const QFileInfo *copy=0);
-    ~QFileInfoPrivate();
-
-    void initFileEngine(const QString &);
-
-    enum Access {
-        ReadAccess,
-        WriteAccess,
-        ExecuteAccess
-    };
-    bool hasAccess(Access access) const;
-
-    uint getFileFlags(QAbstractFileEngine::FileFlags) const;
-    QDateTime &getFileTime(QAbstractFileEngine::FileTime) const;
-    QString getFileName(QAbstractFileEngine::FileName) const;
-
-    enum {
-        CachedFileFlags = 0x01,
-        CachedLinkTypeFlag = 0x02,
-        CachedBundleTypeFlag= 0x04,
-        CachedMTime = 0x10,
-        CachedCTime = 0x20,
-        CachedATime = 0x40,
-        CachedSize = 0x08
-    };
-
-    struct Data
-    {
-        inline Data()
-            : ref(1), fileEngine(0), cache_enabled(1)
-        {
-            clear();
-        }
-
-        inline Data(const Data &copy)
-            : ref(1), fileEngine(QAbstractFileEngine::create(copy.fileName)),
-              fileName(copy.fileName), cache_enabled(copy.cache_enabled)
-        {
-            clear();
-        }
-
-        inline ~Data()
-        {
-            delete fileEngine;
-        }
-
-        inline void clear()
-        {
-            fileNames.clear();
-            fileFlags = 0;
-            cachedFlags = 0;
-        }
-
-        mutable QAtomicInt ref;
-
-        QAbstractFileEngine *fileEngine;
-        mutable QString fileName;
-        mutable QHash<int, QString> fileNames;
-        mutable uint cachedFlags : 31;
-        mutable uint cache_enabled : 1;
-        mutable uint fileFlags;
-        mutable qint64 fileSize;
-        mutable QDateTime fileTimes[3];
-
-        inline bool getCachedFlag(uint c) const
-        { return cache_enabled ? (cachedFlags & c) : 0; }
-
-        inline void setCachedFlag(uint c)
-        { if (cache_enabled) cachedFlags |= c; }
-    } *data;
-
-    inline void reset() {
-        detach();
-        data->clear();
-    }
-
-    void detach();
-};
-
-
-QT_END_NAMESPACE
-#endif
-
diff --git a/src/corelib/io/qfsfileengine_unix.cpp b/src/corelib/io/qfsfileengine_unix.cpp
index 8a0a3f5..7a6a85b 100644
--- a/src/corelib/io/qfsfileengine_unix.cpp
+++ b/src/corelib/io/qfsfileengine_unix.cpp
@@ -780,7 +780,7 @@ QString QFSFileEngine::fileName(FileName file) const
 #endif
             if (len > 0) {
                 QString ret;
-                if (S_ISDIR(d->st.st_mode) && s[0] != '/') {
+                if (d->doStat() && S_ISDIR(d->st.st_mode) && s[0] != '/') {
                     QDir parent(d->filePath);
                     parent.cdUp();
                     ret = parent.path();
diff --git a/src/corelib/io/qnoncontiguousbytedevice.cpp b/src/corelib/io/qnoncontiguousbytedevice.cpp
new file mode 100644
index 0000000..6233fde
--- /dev/null
+++ b/src/corelib/io/qnoncontiguousbytedevice.cpp
@@ -0,0 +1,542 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qnoncontiguousbytedevice_p.h"
+#include <QObject>
+#include <QBuffer>
+#include <QDebug>
+#include <QFile>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QNonContiguousByteDevice
+    \brief A QNonContiguousByteDevice is a representation of a
+    file, array or buffer that allows access with a read pointer.
+    \since 4.6
+
+    \inmodule QtCore
+
+    The goal of this class is to have a data representation that
+    allows us to avoid doing a memcpy as we have to do with QIODevice.
+
+    \sa QNonContiguousByteDeviceFactory
+
+    \internal
+*/
+/*!
+    \fn virtual const char* QNonContiguousByteDevice::readPointer(qint64 maximumLength, qint64 &len)
+
+    Return a byte pointer for at most \a maximumLength bytes of that device.
+    if \a maximumLength is -1, the caller does not care about the length and
+    the device may return what it desires to.
+    The actual number of bytes the pointer is valid for is returned in
+    the \a len variable.
+    \a len will be -1 if EOF or an error occurs.
+    If it was really EOF can then afterwards be checked with atEnd()
+    Returns 0 if it is not possible to read at that position.
+
+    \sa atEnd()
+
+    \internal
+*/
+/*!
+    \fn virtual bool QNonContiguousByteDevice::advanceReadPointer(qint64 amount)
+
+     will advance the internal read pointer by \a amount bytes.
+     The old readPointer is invalid after this call.
+
+    \sa readPointer()
+
+    \internal
+*/
+/*!
+    \fn virtual bool QNonContiguousByteDevice::atEnd()
+
+     Returns true if everything has been read and the read
+     pointer cannot be advanced anymore.
+
+    \sa readPointer(), advanceReadPointer(), reset()
+
+    \internal
+*/
+/*!
+    \fn virtual bool QNonContiguousByteDevice::reset()
+
+    Moves the internal read pointer back to the beginning.
+    Returns false if this was not possible.
+
+    \sa atEnd(), disableReset()
+
+    \internal
+*/
+/*!
+    \fn void QNonContiguousByteDevice::disableReset()
+
+    Disable the reset() call, e.g. it will always
+    do nothing and return false.
+
+    \sa reset()
+
+    \internal
+*/
+/*!
+    \fn virtual qint64 QNonContiguousByteDevice::size()
+
+    Returns the size of the complete device or -1 if unknown.
+    May also return less/more than what can be actually read with readPointer()
+
+    \internal
+*/
+/*!
+    \fn void QNonContiguousByteDevice::readyRead()
+
+    Emitted when there is data available
+
+    \internal
+*/
+/*!
+    \fn void QNonContiguousByteDevice::readProgress(qint64 current, qint64 total)
+
+    Emitted when data has been "read" by advancing the read pointer
+
+    \internal
+*/
+
+QNonContiguousByteDevice::QNonContiguousByteDevice() : QObject((QObject*)0), resetDisabled(false)
+{
+};
+
+QNonContiguousByteDevice::~QNonContiguousByteDevice()
+{
+};
+
+void QNonContiguousByteDevice::disableReset()
+{
+    resetDisabled = true;
+}
+
+QNonContiguousByteDeviceBufferImpl::QNonContiguousByteDeviceBufferImpl(QBuffer *b) : QNonContiguousByteDevice()
+{
+    buffer = b;
+    byteArray = QByteArray::fromRawData(buffer->buffer().constData() + buffer->pos(), buffer->size() - buffer->pos());
+    arrayImpl = new QNonContiguousByteDeviceByteArrayImpl(&byteArray);
+    arrayImpl->setParent(this);
+    connect(arrayImpl, SIGNAL(readyRead()), SIGNAL(readyRead()));
+    connect(arrayImpl, SIGNAL(readProgress(qint64,qint64)), SIGNAL(readProgress(qint64,qint64)));
+}
+
+QNonContiguousByteDeviceBufferImpl::~QNonContiguousByteDeviceBufferImpl()
+{
+}
+
+const char* QNonContiguousByteDeviceBufferImpl::readPointer(qint64 maximumLength, qint64 &len)
+{
+    return arrayImpl->readPointer(maximumLength, len);
+}
+
+bool QNonContiguousByteDeviceBufferImpl::advanceReadPointer(qint64 amount)
+{
+    return arrayImpl->advanceReadPointer(amount);
+}
+
+bool QNonContiguousByteDeviceBufferImpl::atEnd()
+{
+    return arrayImpl->atEnd();
+}
+
+bool QNonContiguousByteDeviceBufferImpl::reset()
+{
+    if (resetDisabled)
+        return false;
+    return arrayImpl->reset();
+}
+
+qint64 QNonContiguousByteDeviceBufferImpl::size()
+{
+    return arrayImpl->size();
+}
+
+QNonContiguousByteDeviceByteArrayImpl::QNonContiguousByteDeviceByteArrayImpl(QByteArray *ba) : QNonContiguousByteDevice(), currentPosition(0)
+{
+    byteArray = ba;
+}
+
+QNonContiguousByteDeviceByteArrayImpl::~QNonContiguousByteDeviceByteArrayImpl()
+{
+}
+
+const char* QNonContiguousByteDeviceByteArrayImpl::readPointer(qint64 maximumLength, qint64 &len)
+{
+    if (atEnd()) {
+        len = -1;
+        return 0;
+    }
+
+    if (maximumLength != -1)
+        len = qMin(maximumLength, size() - currentPosition);
+    else
+        len = size() - currentPosition;
+
+    return byteArray->constData() + currentPosition;
+}
+
+bool QNonContiguousByteDeviceByteArrayImpl::advanceReadPointer(qint64 amount)
+{
+    currentPosition += amount;
+    emit readProgress(currentPosition, size());
+    return true;
+}
+
+bool QNonContiguousByteDeviceByteArrayImpl::atEnd()
+{
+    return currentPosition >= size();
+}
+
+bool QNonContiguousByteDeviceByteArrayImpl::reset()
+{
+    if (resetDisabled)
+        return false;
+
+    currentPosition = 0;
+    return true;
+}
+
+qint64 QNonContiguousByteDeviceByteArrayImpl::size()
+{
+    return byteArray->size();
+}
+
+QNonContiguousByteDeviceRingBufferImpl::QNonContiguousByteDeviceRingBufferImpl(QRingBuffer *rb)
+    : QNonContiguousByteDevice(), currentPosition(0)
+{
+    ringBuffer = rb;
+}
+
+QNonContiguousByteDeviceRingBufferImpl::~QNonContiguousByteDeviceRingBufferImpl()
+{
+};
+
+const char* QNonContiguousByteDeviceRingBufferImpl::readPointer(qint64 maximumLength, qint64 &len)
+{
+    if (atEnd()) {
+        len = -1;
+        return 0;
+    }
+
+    const char *returnValue = ringBuffer->readPointerAtPosition(currentPosition, len);
+
+    if (maximumLength != -1)
+        len = qMin(len, maximumLength);
+
+    return returnValue;
+};
+
+bool QNonContiguousByteDeviceRingBufferImpl::advanceReadPointer(qint64 amount)
+{
+    currentPosition += amount;
+    emit readProgress(currentPosition, size());
+    return true;
+};
+
+bool QNonContiguousByteDeviceRingBufferImpl::atEnd()
+{
+    return currentPosition >= size();
+};
+
+bool QNonContiguousByteDeviceRingBufferImpl::reset()
+{
+    if (resetDisabled)
+        return false;
+
+    currentPosition = 0;
+    return true;
+};
+
+qint64 QNonContiguousByteDeviceRingBufferImpl::size()
+{
+    return ringBuffer->size();
+};
+
+QNonContiguousByteDeviceIoDeviceImpl::QNonContiguousByteDeviceIoDeviceImpl(QIODevice *d)
+    : QNonContiguousByteDevice(),
+    currentReadBuffer(0), currentReadBufferSize(16*1024),
+    currentReadBufferAmount(0), currentReadBufferPosition(0), totalAdvancements(0),
+    eof(false)
+{
+    device = d;
+    initialPosition = d->pos();
+    connect(device, SIGNAL(readyRead()), this, SIGNAL(readyRead()), Qt::QueuedConnection);
+    connect(device, SIGNAL(readChannelFinished()), this, SIGNAL(readyRead()), Qt::QueuedConnection);
+};
+
+QNonContiguousByteDeviceIoDeviceImpl::~QNonContiguousByteDeviceIoDeviceImpl()
+{
+    delete currentReadBuffer;
+};
+
+const char* QNonContiguousByteDeviceIoDeviceImpl::readPointer(qint64 maximumLength, qint64 &len)
+{
+    if (eof == true) {
+        len = -1;
+        return 0;
+    }
+
+    if (currentReadBuffer == 0)
+        currentReadBuffer = new QByteArray(currentReadBufferSize, '\0'); // lazy alloc
+
+    if (maximumLength == -1)
+        maximumLength = currentReadBufferSize;
+
+    if (currentReadBufferAmount - currentReadBufferPosition > 0) {
+        len = currentReadBufferAmount - currentReadBufferPosition;
+        return currentReadBuffer->data() + currentReadBufferPosition;
+    }
+
+    qint64 haveRead = device->read(currentReadBuffer->data(), qMin(maximumLength, currentReadBufferSize));
+
+    if ((haveRead == -1) || (haveRead == 0 && device->atEnd() && !device->isSequential())) {
+        eof = true;
+        len = -1;
+        // size was unknown before, emit a readProgress with the final size
+        if (size() == -1)
+            emit readProgress(totalAdvancements, totalAdvancements);
+        return 0;
+    }
+
+    currentReadBufferAmount = haveRead;
+    currentReadBufferPosition = 0;
+
+    len = haveRead;
+    return currentReadBuffer->data();
+};
+
+bool QNonContiguousByteDeviceIoDeviceImpl::advanceReadPointer(qint64 amount)
+{
+    totalAdvancements += amount;
+
+    // normal advancement
+    currentReadBufferPosition += amount;
+
+    // advancing over that what has actually been read before
+    if (currentReadBufferPosition > currentReadBufferAmount) {
+        qint64 i = currentReadBufferPosition - currentReadBufferAmount;
+        while (i > 0) {
+            if (device->getChar(0) == false) {
+                emit readProgress(totalAdvancements - i, size());
+                return false; // ### FIXME handle eof
+            }
+            i--;
+        }
+
+        currentReadBufferPosition = 0;
+        currentReadBufferAmount = 0;
+    }
+
+    if (size() == -1)
+        emit readProgress(totalAdvancements, totalAdvancements);
+    else
+        emit readProgress(totalAdvancements, size());
+
+    return true;
+};
+
+bool QNonContiguousByteDeviceIoDeviceImpl::atEnd()
+{
+    return eof == true;
+};
+
+bool QNonContiguousByteDeviceIoDeviceImpl::reset()
+{
+    if (resetDisabled)
+        return false;
+
+    if (device->seek(initialPosition)) {
+        eof = false; // assume eof is false, it will be true after a read has been attempted
+        return true;
+    }
+
+    return false;
+};
+
+qint64 QNonContiguousByteDeviceIoDeviceImpl::size()
+{
+    // note that this is different from the size() implementation of QIODevice!
+
+    if (device->isSequential())
+        return -1;
+
+    return device->size() - initialPosition;
+};
+
+QByteDeviceWrappingIoDevice::QByteDeviceWrappingIoDevice(QNonContiguousByteDevice *bd) : QIODevice((QObject*)0)
+{
+    byteDevice = bd;
+    connect(bd, SIGNAL(readyRead()), SIGNAL(readyRead()));
+
+    open(ReadOnly);
+}
+
+QByteDeviceWrappingIoDevice::~QByteDeviceWrappingIoDevice()
+{
+
+}
+
+bool QByteDeviceWrappingIoDevice::isSequential() const
+{
+    return (byteDevice->size() == -1);
+}
+
+bool QByteDeviceWrappingIoDevice::atEnd() const
+{
+    return byteDevice->atEnd();
+}
+
+bool QByteDeviceWrappingIoDevice::reset()
+{
+    return byteDevice->reset();
+}
+
+qint64 QByteDeviceWrappingIoDevice::size() const
+{
+    if (isSequential())
+        return 0;
+
+    return byteDevice->size();
+}
+
+
+qint64 QByteDeviceWrappingIoDevice::readData( char * data, qint64 maxSize)
+{
+    qint64 len;
+    const char *readPointer = byteDevice->readPointer(maxSize, len);
+    if (len == -1)
+        return -1;
+
+    memcpy(data, readPointer, len);
+    byteDevice->advanceReadPointer(len);
+    return len;
+}
+
+qint64 QByteDeviceWrappingIoDevice::writeData( const char* data, qint64 maxSize)
+{
+     return -1;
+}
+
+/*!
+    \class QNonContiguousByteDeviceFactory
+    \since 4.6
+
+    \inmodule QtCore
+
+    Creates a QNonContiguousByteDevice out of a QIODevice,
+    QByteArray etc.
+
+    \sa QNonContiguousByteDevice
+
+    \internal
+*/
+
+/*!
+    \fn static QNonContiguousByteDevice* QNonContiguousByteDeviceFactory::create(QIODevice *device);
+
+    Create a QNonContiguousByteDevice out of a QIODevice.
+    For QFile, QBuffer and all other QIoDevice, sequential or not.
+
+    \internal
+*/
+QNonContiguousByteDevice* QNonContiguousByteDeviceFactory::create(QIODevice *device)
+{
+    // shortcut if it is a QBuffer
+    if (QBuffer* buffer = qobject_cast<QBuffer*>(device)) {
+        return new QNonContiguousByteDeviceBufferImpl(buffer);
+    }
+
+    // ### FIXME special case if device is a QFile that supports map()
+    // then we can actually deal with the file without using read/peek
+
+    // generic QIODevice
+    return new QNonContiguousByteDeviceIoDeviceImpl(device); // FIXME
+};
+
+/*!
+    \fn static QNonContiguousByteDevice* QNonContiguousByteDeviceFactory::create(QRingBuffer *ringBuffer);
+
+    Create a QNonContiguousByteDevice out of a QRingBuffer.
+
+    \internal
+*/
+QNonContiguousByteDevice* QNonContiguousByteDeviceFactory::create(QRingBuffer *ringBuffer)
+{
+    return new QNonContiguousByteDeviceRingBufferImpl(ringBuffer);
+};
+
+/*!
+    \fn static QNonContiguousByteDevice* QNonContiguousByteDeviceFactory::create(QByteArray *byteArray);
+
+    Create a QNonContiguousByteDevice out of a QByteArray.
+
+    \internal
+*/
+QNonContiguousByteDevice* QNonContiguousByteDeviceFactory::create(QByteArray *byteArray)
+{
+    return new QNonContiguousByteDeviceByteArrayImpl(byteArray);
+};
+
+/*!
+    \fn static QIODevice* QNonContiguousByteDeviceFactory::wrap(QNonContiguousByteDevice* byteDevice);
+
+    Wrap the \a byteDevice (possibly again) into a QIODevice.
+
+    \internal
+*/
+QIODevice* QNonContiguousByteDeviceFactory::wrap(QNonContiguousByteDevice* byteDevice)
+{
+    // ### FIXME if it already has been based on QIoDevice, we could that one out again
+    // and save some calling
+
+    // needed for FTP backend
+
+    return new QByteDeviceWrappingIoDevice(byteDevice);
+}
+
+QT_END_NAMESPACE
+
diff --git a/src/corelib/io/qnoncontiguousbytedevice_p.h b/src/corelib/io/qnoncontiguousbytedevice_p.h
new file mode 100644
index 0000000..2a7e40b
--- /dev/null
+++ b/src/corelib/io/qnoncontiguousbytedevice_p.h
@@ -0,0 +1,189 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QNONCONTIGUOUSBYTEDEVICE_H
+#define QNONCONTIGUOUSBYTEDEVICE_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of a number of Qt sources files.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QObject>
+#include <QtCore/qbytearray.h>
+#include <QtCore/qbuffer.h>
+#include <QtCore/qiodevice.h>
+#include "private/qringbuffer_p.h"
+
+QT_BEGIN_NAMESPACE
+
+class Q_CORE_EXPORT QNonContiguousByteDevice : public QObject
+{
+    Q_OBJECT
+public:
+    virtual const char* readPointer(qint64 maximumLength, qint64 &len) = 0;
+    virtual bool advanceReadPointer(qint64 amount) = 0;
+    virtual bool atEnd() = 0;
+    virtual bool reset() = 0;
+    void disableReset();
+    virtual qint64 size() = 0;
+
+protected:
+    QNonContiguousByteDevice();
+    virtual ~QNonContiguousByteDevice();
+
+    bool resetDisabled;
+signals:
+    void readyRead();
+    void readProgress(qint64 current, qint64 total);
+};
+
+class Q_CORE_EXPORT QNonContiguousByteDeviceFactory
+{
+public:
+    static QNonContiguousByteDevice* create(QIODevice *device);
+    static QNonContiguousByteDevice* create(QByteArray *byteArray);
+    static QNonContiguousByteDevice* create(QRingBuffer *ringBuffer);
+    static QIODevice* wrap(QNonContiguousByteDevice* byteDevice);
+};
+
+// the actual implementations
+//
+
+class QNonContiguousByteDeviceByteArrayImpl : public QNonContiguousByteDevice
+{
+    Q_OBJECT
+public:
+    QNonContiguousByteDeviceByteArrayImpl(QByteArray *ba);
+    ~QNonContiguousByteDeviceByteArrayImpl();
+    const char* readPointer(qint64 maximumLength, qint64 &len);
+    bool advanceReadPointer(qint64 amount);
+    bool atEnd();
+    bool reset();
+    qint64 size();
+protected:
+    QByteArray* byteArray;
+    qint64 currentPosition;
+};
+
+class QNonContiguousByteDeviceRingBufferImpl : public QNonContiguousByteDevice
+{
+    Q_OBJECT
+public:
+    QNonContiguousByteDeviceRingBufferImpl(QRingBuffer *rb);
+    ~QNonContiguousByteDeviceRingBufferImpl();
+    const char* readPointer(qint64 maximumLength, qint64 &len);
+    bool advanceReadPointer(qint64 amount);
+    bool atEnd();
+    bool reset();
+    qint64 size();
+protected:
+    QRingBuffer* ringBuffer;
+    qint64 currentPosition;
+};
+
+
+class QNonContiguousByteDeviceIoDeviceImpl : public QNonContiguousByteDevice
+{
+    Q_OBJECT
+public:
+    QNonContiguousByteDeviceIoDeviceImpl(QIODevice *d);
+    ~QNonContiguousByteDeviceIoDeviceImpl();
+    const char* readPointer(qint64 maximumLength, qint64 &len);
+    bool advanceReadPointer(qint64 amount);
+    bool atEnd();
+    bool reset();
+    qint64 size();
+protected:
+    QIODevice* device;
+    QByteArray* currentReadBuffer;
+    qint64 currentReadBufferSize;
+    qint64 currentReadBufferAmount;
+    qint64 currentReadBufferPosition;
+    qint64 totalAdvancements;
+    bool eof;
+    qint64 initialPosition;
+};
+
+class QNonContiguousByteDeviceBufferImpl : public QNonContiguousByteDevice
+{
+    Q_OBJECT
+public:
+    QNonContiguousByteDeviceBufferImpl(QBuffer *b);
+    ~QNonContiguousByteDeviceBufferImpl();
+    const char* readPointer(qint64 maximumLength, qint64 &len);
+    bool advanceReadPointer(qint64 amount);
+    bool atEnd();
+    bool reset();
+    qint64 size();
+protected:
+    QBuffer* buffer;
+    QByteArray byteArray;
+    QNonContiguousByteDeviceByteArrayImpl* arrayImpl;
+};
+
+// ... and the reverse thing
+class QByteDeviceWrappingIoDevice : public QIODevice
+{
+    Q_OBJECT
+public:
+    QByteDeviceWrappingIoDevice (QNonContiguousByteDevice *bd);
+    ~QByteDeviceWrappingIoDevice ();
+    virtual bool isSequential () const;
+    virtual bool atEnd () const;
+    virtual bool reset ();
+    virtual qint64 size () const;
+protected:
+     virtual qint64 readData ( char * data, qint64 maxSize );
+     virtual qint64 writeData ( const char * data, qint64 maxSize );
+
+     QNonContiguousByteDevice *byteDevice;
+};
+
+QT_END_NAMESPACE
+
+#endif
diff --git a/src/corelib/kernel/qcoreapplication.cpp b/src/corelib/kernel/qcoreapplication.cpp
index c21cf87..77ef096 100644
--- a/src/corelib/kernel/qcoreapplication.cpp
+++ b/src/corelib/kernel/qcoreapplication.cpp
@@ -1710,7 +1710,7 @@ QString QCoreApplication::applicationDirPath()
     }
 
     QCoreApplicationPrivate *d = self->d_func();
-    if (d->cachedApplicationDirPath == QString())
+    if (d->cachedApplicationDirPath.isNull())
         d->cachedApplicationDirPath = QFileInfo(applicationFilePath()).path();
     return d->cachedApplicationDirPath;
 }
@@ -1738,7 +1738,7 @@ QString QCoreApplication::applicationFilePath()
     }
 
     QCoreApplicationPrivate *d = self->d_func();
-    if (d->cachedApplicationFilePath != QString())
+    if (!d->cachedApplicationFilePath.isNull())
         return d->cachedApplicationFilePath;
 
 #if defined( Q_WS_WIN )
diff --git a/src/corelib/kernel/qvariant.cpp b/src/corelib/kernel/qvariant.cpp
index b53e91f..b504604 100644
--- a/src/corelib/kernel/qvariant.cpp
+++ b/src/corelib/kernel/qvariant.cpp
@@ -1173,8 +1173,9 @@ const QVariant::Handler *QVariant::handler = &qt_kernel_variant_handler;
     and versatile, but may prove less memory and speed efficient than
     storing specific types in standard data structures.
 
-    QVariant also supports the notion of null values, where you have
-    a defined type with no value set.
+    QVariant also supports the notion of null values, where you can 
+    have a defined type with no value set. However, note that QVariant 
+    types can only be cast when they have had a value set.
 
     \snippet doc/src/snippets/code/src_corelib_kernel_qvariant.cpp 1
 
diff --git a/src/corelib/tools/qcontiguouscache.cpp b/src/corelib/tools/qcontiguouscache.cpp
new file mode 100644
index 0000000..7db3a5a
--- /dev/null
+++ b/src/corelib/tools/qcontiguouscache.cpp
@@ -0,0 +1,435 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qcontiguouscache.h"
+#include <QDebug>
+
+QT_BEGIN_NAMESPACE
+
+void QContiguousCacheData::dump() const
+{
+    qDebug() << "capacity:" << alloc;
+    qDebug() << "count:" << count;
+    qDebug() << "start:" << start;
+    qDebug() << "offset:" << offset;
+}
+
+/*! \class QContiguousCache
+    \brief The QContiguousCache class is a template class that provides a contiguous cache.
+    \ingroup tools
+    \ingroup shared
+    \reentrant
+
+    The QContiguousCache class provides an efficient way of caching items for
+    display in a user interface view.  Unlike QCache, it adds a restriction
+    that elements within the cache are contiguous.  This has the advantage
+    of matching how user interface views most commonly request data, as
+    a set of rows localized around the current scrolled position.  This
+    restriction allows the cache to consume less memory and processor
+    cycles than QCache.  The QContiguousCache class also can provide
+    an upper bound on memory usage via setCapacity().
+
+    The simplest way of using a contiguous cache is to use the append()
+    and prepend().
+
+\code
+MyRecord record(int row) const
+{
+    Q_ASSERT(row >= 0 && row < count());
+
+    while(row > cache.lastIndex())
+        cache.append(slowFetchRecord(cache.lastIndex()+1));
+    while(row < cache.firstIndex())
+        cache.prepend(slowFetchRecord(cache.firstIndex()-1));
+
+    return cache.at(row);
+}
+\endcode
+
+    If the cache is full then the item at the opposite end of the cache from
+    where the new item is appended or prepended will be removed.
+
+    This usage can be further optimized by using the insert() function
+    in the case where the requested row is a long way from the currently cached
+    items. If there is a gap between where the new item is inserted and the currently
+    cached items then the existing cached items are first removed to retain
+    the contiguous nature of the cache.  Hence it is important to take some care then
+    when using insert() in order to avoid unwanted clearing of the cache.
+
+    The range of valid indexes for the QContiguousCache class are from
+    0 to INT_MAX.  Calling prepend() such that the first index would become less
+    than 0 or append() such that the last index would become greater
+    than INT_MAX can result in the indexes of the cache being invalid.
+    When the cache indexes are invalid it is important to call
+    normalizeIndexes() before calling any of containsIndex(), firstIndex(),
+    lastIndex(), at() or the [] operator.  Calling these
+    functions when the cache has invalid indexes will result in undefined
+    behavior.  The indexes can be checked by using areIndexesValid()
+
+    In most cases the indexes will not exceed 0 to INT_MAX, and
+    normalizeIndexes() will not need to be used.
+
+    See the \l{Contiguous Cache Example}{Contiguous Cache} example.
+*/
+
+/*! \fn QContiguousCache::QContiguousCache(int capacity)
+
+    Constructs a cache with the given \a capacity.
+
+    \sa setCapacity()
+*/
+
+/*! \fn QContiguousCache::QContiguousCache(const QContiguousCache<T> &other)
+
+    Constructs a copy of \a other.
+
+    This operation takes \l{constant time}, because QContiguousCache is
+    \l{implicitly shared}.  This makes returning a QContiguousCache from a
+    function very fast.  If a shared instance is modified, it will be
+    copied (copy-on-write), and that takes \l{linear time}.
+
+    \sa operator=()
+*/
+
+/*! \fn QContiguousCache::~QContiguousCache()
+
+    Destroys the cache.
+*/
+
+/*! \fn void QContiguousCache::detach()
+
+    \internal
+*/
+
+/*! \fn bool QContiguousCache::isDetached() const
+
+    \internal
+*/
+
+/*! \fn void QContiguousCache::setSharable(bool sharable)
+
+    \internal
+*/
+
+/*! \fn QContiguousCache<T> &QContiguousCache::operator=(const QContiguousCache<T> &other)
+
+    Assigns \a other to this cache and returns a reference to this cache.
+*/
+
+/*! \fn bool QContiguousCache::operator==(const QContiguousCache<T> &other) const
+
+    Returns true if \a other is equal to this cache; otherwise returns false.
+
+    Two caches are considered equal if they contain the same values at the same
+    indexes.  This function requires the value type to implement the \c operator==().
+
+    \sa operator!=()
+*/
+
+/*! \fn bool QContiguousCache::operator!=(const QContiguousCache<T> &other) const
+
+    Returns true if \a other is not equal to this cache; otherwise
+    returns false.
+
+    Two caches are considered equal if they contain the same values at the same
+    indexes.  This function requires the value type to implement the \c operator==().
+
+    \sa operator==()
+*/
+
+/*! \fn int QContiguousCache::capacity() const
+
+    Returns the number of items the cache can store before it is full.
+    When a cache contains a number of items equal to its capacity, adding new
+    items will cause items farthest from the added item to be removed.
+
+    \sa setCapacity(), size()
+*/
+
+/*! \fn int QContiguousCache::count() const
+
+    \overload
+
+    Same as size().
+*/
+
+/*! \fn int QContiguousCache::size() const
+
+    Returns the number of items contained within the cache.
+
+    \sa capacity()
+*/
+
+/*! \fn bool QContiguousCache::isEmpty() const
+
+    Returns true if no items are stored within the cache.
+
+    \sa size(), capacity()
+*/
+
+/*! \fn bool QContiguousCache::isFull() const
+
+    Returns true if the number of items stored within the cache is equal
+    to the capacity of the cache.
+
+    \sa size(), capacity()
+*/
+
+/*! \fn int QContiguousCache::available() const
+
+    Returns the number of items that can be added to the cache before it becomes full.
+
+    \sa size(), capacity(), isFull()
+*/
+
+/*! \fn void QContiguousCache::clear()
+
+    Removes all items from the cache.  The capacity is unchanged.
+*/
+
+/*! \fn void QContiguousCache::setCapacity(int size)
+
+    Sets the capacity of the cache to the given \a size.  A cache can hold a
+    number of items equal to its capacity.  When inserting, appending or prepending
+    items to the cache, if the cache is already full then the item farthest from
+    the added item will be removed.
+
+    If the given \a size is smaller than the current count of items in the cache
+    then only the last \a size items from the cache will remain.
+
+    \sa capacity(), isFull()
+*/
+
+/*! \fn const T &QContiguousCache::at(int i) const
+
+    Returns the item at index position \a i in the cache.  \a i must
+    be a valid index position in the cache (i.e, firstIndex() <= \a i <= lastIndex()).
+
+    The indexes in the cache refer to the number of positions the item is from the
+    first item appended into the cache.  That is to say a cache with a capacity of
+    100, that has had 150 items appended will have a valid index range of
+    50 to 149.  This allows inserting and retrieving items into the cache based
+    on a theoretical infinite list
+
+    \sa firstIndex(), lastIndex(), insert(), operator[]()
+*/
+
+/*! \fn T &QContiguousCache::operator[](int i)
+
+    Returns the item at index position \a i as a modifiable reference.  If
+    the cache does not contain an item at the given index position \a i
+    then it will first insert an empty item at that position.
+
+    In most cases it is better to use either at() or insert().
+
+    Note that using non-const operators can cause QContiguousCache to do a deep
+    copy.
+
+    \sa insert(), at()
+*/
+
+/*! \fn const T &QContiguousCache::operator[](int i) const
+
+    \overload
+
+    Same as at(\a i).
+*/
+
+/*! \fn void QContiguousCache::append(const T &value)
+
+    Inserts \a value at the end of the cache.  If the cache is already full
+    the item at the start of the cache will be removed.
+
+    \sa prepend(), insert(), isFull()
+*/
+
+/*! \fn void QContiguousCache::prepend(const T &value)
+
+    Inserts \a value at the start of the cache.  If the cache is already full
+    the item at the end of the cache will be removed.
+
+    \sa append(), insert(), isFull()
+*/
+
+/*! \fn void QContiguousCache::insert(int i, const T &value)
+
+    Inserts the \a value at the index position \a i.  If the cache already contains
+    an item at \a i then that value is replaced.  If \a i is either one more than
+    lastIndex() or one less than firstIndex() it is the equivalent to an append()
+    or a prepend().
+
+    If the given index \a i is not within the current range of the cache nor adjacent
+    to the bounds of the cache's index range, the cache is first cleared before
+    inserting the item.  At this point the cache will have a size of 1.  It is
+    worthwhile taking effort to insert items in an order that starts adjacent
+    to the current index range for the cache.
+
+    The range of valid indexes for the QContiguousCache class are from
+    0 to INT_MAX. Inserting outside of this range has undefined behavior.
+
+
+    \sa prepend(), append(), isFull(), firstIndex(), lastIndex()
+*/
+
+/*! \fn bool QContiguousCache::containsIndex(int i) const
+
+    Returns true if the cache's index range includes the given index \a i.
+
+    \sa firstIndex(), lastIndex()
+*/
+
+/*! \fn int QContiguousCache::firstIndex() const
+
+    Returns the first valid index in the cache.  The index will be invalid if the
+    cache is empty.
+
+    \sa capacity(), size(), lastIndex()
+*/
+
+/*! \fn int QContiguousCache::lastIndex() const
+
+    Returns the last valid index in the cache.  The index will be invalid if the cache is empty.
+
+    \sa capacity(), size(), firstIndex()
+*/
+
+
+/*! \fn T &QContiguousCache::first()
+
+    Returns a reference to the first item in the cache.  This function
+    assumes that the cache isn't empty.
+
+    \sa last(), isEmpty()
+*/
+
+/*! \fn T &QContiguousCache::last()
+
+    Returns a reference to the last item in the cache.  This function
+    assumes that the cache isn't empty.
+
+    \sa first(), isEmpty()
+*/
+
+/*! \fn const T& QContiguousCache::first() const
+
+    \overload
+*/
+
+/*! \fn const T& QContiguousCache::last() const
+
+    \overload
+*/
+
+/*! \fn void QContiguousCache::removeFirst()
+
+    Removes the first item from the cache.  This function assumes that
+    the cache isn't empty.
+
+    \sa removeLast()
+*/
+
+/*! \fn void QContiguousCache::removeLast()
+
+    Removes the last item from the cache.  This function assumes that
+    the cache isn't empty.
+
+    \sa removeFirst()
+*/
+
+/*! \fn T QContiguousCache::takeFirst()
+
+    Removes the first item in the cache and returns it.  This function
+    assumes that the cache isn't empty.
+
+    If you don't use the return value, removeFirst() is more efficient.
+
+    \sa takeLast(), removeFirst()
+*/
+
+/*! \fn T QContiguousCache::takeLast()
+
+    Removes the last item in the cache and returns it. This function
+    assumes that the cache isn't empty.
+
+    If you don't use the return value, removeLast() is more efficient.
+
+    \sa takeFirst(), removeLast()
+*/
+
+/*! \fn void QContiguousCache::normalizeIndexes()
+
+    Moves the first index and last index of the cache
+    such that they point to valid indexes.  The function does not modify
+    the contents of the cache or the ordering of elements within the cache.
+
+    It is provided so that index overflows can be corrected when using the
+    cache as a circular buffer.
+
+    \code
+    QContiguousCache<int> cache(10);
+    cache.insert(INT_MAX, 1); // cache contains one value and has valid indexes, INT_MAX to INT_MAX
+    cache.append(2); // cache contains two values but does not have valid indexes.
+    cache.normalizeIndexes(); // cache has two values, 1 and 2.  New first index will be in the range of 0 to capacity().
+    \endcode
+
+    \sa areIndexesValid(), append(), prepend()
+*/
+
+/*! \fn bool QContiguousCache::areIndexesValid() const
+
+    Returns whether the indexes for items stored in the cache are valid.
+    Indexes can become invalid if items are appended after the index position
+    INT_MAX or prepended before the index position 0.  This is only expected
+    to occur in very long lived circular buffer style usage of the
+    contiguous cache.  Indexes can be made valid again by calling
+    normalizeIndexs().
+
+    \sa normalizeIndexes(), append(), prepend()
+*/
+
+/*! \fn void QContiguousCache::dump() const
+
+    \internal
+
+    Sends information about the cache's internal structure to qDebug()
+*/
+
+QT_END_NAMESPACE
diff --git a/src/corelib/tools/qcontiguouscache.h b/src/corelib/tools/qcontiguouscache.h
new file mode 100644
index 0000000..5cd1582
--- /dev/null
+++ b/src/corelib/tools/qcontiguouscache.h
@@ -0,0 +1,424 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QCONTIGUOUSCACHE_H
+#define QCONTIGUOUSCACHE_H
+
+#include <QtCore/qatomic.h>
+#include <limits.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Core)
+
+struct Q_CORE_EXPORT QContiguousCacheData
+{
+    QBasicAtomicInt ref;
+    int alloc;
+    int count;
+    int start;
+    int offset;
+    uint sharable : 1;
+
+    void dump() const;
+};
+
+template <typename T>
+struct QContiguousCacheTypedData
+{
+    QBasicAtomicInt ref;
+    int alloc;
+    int count;
+    int start;
+    int offset;
+    uint sharable : 1;
+
+    T array[1];
+};
+
+template<typename T>
+class QContiguousCache {
+    typedef QContiguousCacheTypedData<T> Data;
+    union { QContiguousCacheData *p; QContiguousCacheTypedData<T> *d; };
+public:
+    explicit QContiguousCache(int capacity = 0);
+    QContiguousCache(const QContiguousCache<T> &v) : d(v.d) { d->ref.ref(); if (!d->sharable) detach_helper(); }
+
+    inline ~QContiguousCache() { if (!d) return; if (!d->ref.deref()) free(d); }
+
+    inline void detach() { if (d->ref != 1) detach_helper(); }
+    inline bool isDetached() const { return d->ref == 1; }
+    inline void setSharable(bool sharable) { if (!sharable) detach(); d->sharable = sharable; }
+
+    QContiguousCache<T> &operator=(const QContiguousCache<T> &other);
+    bool operator==(const QContiguousCache<T> &other) const;
+    inline bool operator!=(const QContiguousCache<T> &other) const { return !(*this == other); }
+
+    inline int capacity() const {return d->alloc; }
+    inline int count() const { return d->count; }
+    inline int size() const { return d->count; }
+
+    inline bool isEmpty() const { return d->count == 0; }
+    inline bool isFull() const { return d->count == d->alloc; }
+    inline int available() const { return d->alloc - d->count; }
+
+    void clear();
+    void setCapacity(int size);
+
+    const T &at(int pos) const;
+    T &operator[](int i);
+    const T &operator[](int i) const;
+
+    void append(const T &value);
+    void prepend(const T &value);
+    void insert(int pos, const T &value);
+
+    inline bool containsIndex(int pos) const { return pos >= d->offset && pos - d->offset < d->count; }
+    inline int firstIndex() const { return d->offset; }
+    inline int lastIndex() const { return d->offset + d->count - 1; }
+
+    inline const T &first() const { Q_ASSERT(!isEmpty()); return d->array[d->start]; }
+    inline const T &last() const { Q_ASSERT(!isEmpty()); return d->array[(d->start + d->count -1) % d->alloc]; }
+    inline T &first() { Q_ASSERT(!isEmpty()); detach(); return d->array[d->start]; }
+    inline T &last() { Q_ASSERT(!isEmpty()); detach(); return d->array[(d->start + d->count -1) % d->alloc]; }
+
+    void removeFirst();
+    T takeFirst();
+    void removeLast();
+    T takeLast();
+
+    inline bool areIndexesValid() const
+    { return d->offset >= 0 && d->offset < INT_MAX - d->count && (d->offset % d->alloc) == d->start; }
+
+    inline void normalizeIndexes() { d->offset = d->start; }
+    // debug
+    void dump() const { p->dump(); }
+private:
+    void detach_helper();
+
+    QContiguousCacheData *malloc(int aalloc);
+    void free(Data *x);
+    int sizeOfTypedData() {
+        // this is more or less the same as sizeof(Data), except that it doesn't
+        // count the padding at the end
+        return reinterpret_cast<const char *>(&(reinterpret_cast<const Data *>(this))->array[1]) - reinterpret_cast<const char *>(this);
+    }
+};
+
+template <typename T>
+void QContiguousCache<T>::detach_helper()
+{
+    union { QContiguousCacheData *p; QContiguousCacheTypedData<T> *d; } x;
+
+    x.p = malloc(d->alloc);
+    x.d->ref = 1;
+    x.d->count = d->count;
+    x.d->start = d->start;
+    x.d->offset = d->offset;
+    x.d->alloc = d->alloc;
+    x.d->sharable = true;
+
+    T *dest = x.d->array + x.d->start;
+    T *src = d->array + d->start;
+    int count = x.d->count;
+    while (count--) {
+        if (QTypeInfo<T>::isComplex) {
+            new (dest) T(*src);
+        } else {
+            *dest = *src;
+        }
+        dest++;
+        if (dest == x.d->array + x.d->alloc)
+            dest = x.d->array;
+        src++;
+        if (src == d->array + d->alloc)
+            src = d->array;
+    }
+
+    if (!d->ref.deref())
+        free(d);
+    d = x.d;
+}
+
+template <typename T>
+void QContiguousCache<T>::setCapacity(int asize)
+{
+    if (asize == d->alloc)
+        return;
+    detach();
+    union { QContiguousCacheData *p; QContiguousCacheTypedData<T> *d; } x;
+    x.p = malloc(asize);
+    x.d->alloc = asize;
+    x.d->count = qMin(d->count, asize);
+    x.d->offset = d->offset + d->count - x.d->count;
+    x.d->start = x.d->offset % x.d->alloc;
+    T *dest = x.d->array + (x.d->start + x.d->count-1) % x.d->alloc;
+    T *src = d->array + (d->start + d->count-1) % d->alloc;
+    int count = x.d->count;
+    while (count--) {
+        if (QTypeInfo<T>::isComplex) {
+            new (dest) T(*src);
+        } else {
+            *dest = *src;
+        }
+        if (dest == x.d->array)
+            dest = x.d->array + x.d->alloc;
+        dest--;
+        if (src == d->array)
+            src = d->array + d->alloc;
+        src--;
+    }
+    /* free old */
+    free(d);
+    d = x.d;
+}
+
+template <typename T>
+void QContiguousCache<T>::clear()
+{
+    if (d->ref == 1) {
+        if (QTypeInfo<T>::isComplex) {
+            int count = d->count;
+            T * i = d->array + d->start;
+            T * e = d->array + d->alloc;
+            while (count--) {
+                i->~T();
+                i++;
+                if (i == e)
+                    i = d->array;
+            }
+        }
+        d->count = d->start = d->offset = 0;
+    } else {
+        union { QContiguousCacheData *p; QContiguousCacheTypedData<T> *d; } x;
+        x.p = malloc(d->alloc);
+        x.d->ref = 1;
+        x.d->alloc = d->alloc;
+        x.d->count = x.d->start = x.d->offset = 0;
+        x.d->sharable = true;
+        if (!d->ref.deref()) free(d);
+        d = x.d;
+    }
+}
+
+template <typename T>
+inline QContiguousCacheData *QContiguousCache<T>::malloc(int aalloc)
+{
+    return static_cast<QContiguousCacheData *>(qMalloc(sizeOfTypedData() + (aalloc - 1) * sizeof(T)));
+}
+
+template <typename T>
+QContiguousCache<T>::QContiguousCache(int capacity)
+{
+    p = malloc(capacity);
+    d->ref = 1;
+    d->alloc = capacity;
+    d->count = d->start = d->offset = 0;
+    d->sharable = true;
+}
+
+template <typename T>
+QContiguousCache<T> &QContiguousCache<T>::operator=(const QContiguousCache<T> &other)
+{
+    other.d->ref.ref();
+    if (!d->ref.deref())
+        free(d);
+    d = other.d;
+    if (!d->sharable)
+        detach_helper();
+    return *this;
+}
+
+template <typename T>
+bool QContiguousCache<T>::operator==(const QContiguousCache<T> &other) const
+{
+    if (other.d == d)
+        return true;
+    if (other.d->start != d->start
+            || other.d->count != d->count
+            || other.d->offset != d->offset
+            || other.d->alloc != d->alloc)
+        return false;
+    for (int i = firstIndex(); i <= lastIndex(); ++i)
+        if (!(at(i) == other.at(i)))
+            return false;
+    return true;
+}
+
+template <typename T>
+void QContiguousCache<T>::free(Data *x)
+{
+    if (QTypeInfo<T>::isComplex) {
+        int count = d->count;
+        T * i = d->array + d->start;
+        T * e = d->array + d->alloc;
+        while (count--) {
+            i->~T();
+            i++;
+            if (i == e)
+                i = d->array;
+        }
+    }
+    qFree(x);
+}
+template <typename T>
+void QContiguousCache<T>::append(const T &value)
+{
+    detach();
+    if (QTypeInfo<T>::isComplex) {
+        if (d->count == d->alloc)
+            (d->array + (d->start+d->count) % d->alloc)->~T();
+        new (d->array + (d->start+d->count) % d->alloc) T(value);
+    } else {
+        d->array[(d->start+d->count) % d->alloc] = value;
+    }
+
+    if (d->count == d->alloc) {
+        d->start++;
+        d->start %= d->alloc;
+        d->offset++;
+    } else {
+        d->count++;
+    }
+}
+
+template<typename T>
+void QContiguousCache<T>::prepend(const T &value)
+{
+    detach();
+    if (d->start)
+        d->start--;
+    else
+        d->start = d->alloc-1;
+    d->offset--;
+
+    if (d->count != d->alloc)
+        d->count++;
+    else
+        if (d->count == d->alloc)
+            (d->array + d->start)->~T();
+
+    if (QTypeInfo<T>::isComplex)
+        new (d->array + d->start) T(value);
+    else
+        d->array[d->start] = value;
+}
+
+template<typename T>
+void QContiguousCache<T>::insert(int pos, const T &value)
+{
+    Q_ASSERT_X(pos >= 0 && pos < INT_MAX, "QContiguousCache<T>::insert", "index out of range");
+    detach();
+    if (containsIndex(pos)) {
+        if(QTypeInfo<T>::isComplex)
+            new (d->array + pos % d->alloc) T(value);
+        else
+            d->array[pos % d->alloc] = value;
+    } else if (pos == d->offset-1)
+        prepend(value);
+    else if (pos == d->offset+d->count)
+        append(value);
+    else {
+        // we don't leave gaps.
+        clear();
+        d->offset = pos;
+        d->start = pos % d->alloc;
+        d->count = 1;
+        if (QTypeInfo<T>::isComplex)
+            new (d->array + d->start) T(value);
+        else
+            d->array[d->start] = value;
+    }
+}
+
+template <typename T>
+inline const T &QContiguousCache<T>::at(int pos) const
+{ Q_ASSERT_X(pos >= d->offset && pos - d->offset < d->count, "QContiguousCache<T>::at", "index out of range"); return d->array[pos % d->alloc]; }
+template <typename T>
+inline const T &QContiguousCache<T>::operator[](int pos) const
+{ Q_ASSERT_X(pos >= d->offset && pos - d->offset < d->count, "QContiguousCache<T>::at", "index out of range"); return d->array[pos % d->alloc]; }
+
+template <typename T>
+inline T &QContiguousCache<T>::operator[](int pos)
+{
+    detach();
+    if (!containsIndex(pos))
+        insert(pos, T());
+    return d->array[pos % d->alloc];
+}
+
+template <typename T>
+inline void QContiguousCache<T>::removeFirst()
+{
+    Q_ASSERT(d->count > 0);
+    detach();
+    d->count--;
+    if (QTypeInfo<T>::isComplex)
+        (d->array + d->start)->~T();
+    d->start = (d->start + 1) % d->alloc;
+    d->offset++;
+}
+
+template <typename T>
+inline void QContiguousCache<T>::removeLast()
+{
+    Q_ASSERT(d->count > 0);
+    detach();
+    d->count--;
+    if (QTypeInfo<T>::isComplex)
+        (d->array + (d->start + d->count) % d->alloc)->~T();
+}
+
+template <typename T>
+inline T QContiguousCache<T>::takeFirst()
+{ T t = first(); removeFirst(); return t; }
+
+template <typename T>
+inline T QContiguousCache<T>::takeLast()
+{ T t = last(); removeLast(); return t; }
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif
diff --git a/src/corelib/tools/qhash.cpp b/src/corelib/tools/qhash.cpp
index 21d98b5..2313e0e 100644
--- a/src/corelib/tools/qhash.cpp
+++ b/src/corelib/tools/qhash.cpp
@@ -379,6 +379,107 @@ void QHashData::checkSanity()
 #endif
 
 /*!
+    \fn uint qHash(const QPair<T1, T2> &key)
+    \since 4.3
+    \relates QHash
+    
+    Returns the hash value for the \a key.
+
+    Types \c T1 and \c T2 must be supported by qHash().
+*/
+
+/*! \fn uint qHash(char key)
+    \relates QHash
+
+    Returns the hash value for the \a key.
+*/
+
+/*! \fn uint qHash(uchar key)
+    \relates QHash
+
+    Returns the hash value for the \a key.
+*/
+
+/*! \fn uint qHash(signed char key)
+    \relates QHash
+
+    Returns the hash value for the \a key.
+*/
+
+/*! \fn uint qHash(ushort key)
+    \relates QHash
+
+    Returns the hash value for the \a key.
+*/
+
+/*! \fn uint qHash(short key)
+    \relates QHash
+
+    Returns the hash value for the \a key.
+*/
+
+/*! \fn uint qHash(uint key)
+    \relates QHash
+
+    Returns the hash value for the \a key.
+*/
+
+/*! \fn uint qHash(int key)
+    \relates QHash
+
+    Returns the hash value for the \a key.
+*/
+
+/*! \fn uint qHash(ulong key)
+    \relates QHash
+
+    Returns the hash value for the \a key.
+*/
+
+/*! \fn uint qHash(long key)
+    \relates QHash
+
+    Returns the hash value for the \a key.
+*/
+
+/*! \fn uint qHash(quint64 key)
+    \relates QHash
+
+    Returns the hash value for the \a key.
+*/
+
+/*! \fn uint qHash(qint64 key)
+    \relates QHash
+
+    Returns the hash value for the \a key.
+*/
+
+/*! \fn uint qHash(QChar key)
+    \relates QHash
+
+    Returns the hash value for the \a key.
+*/
+
+/*! \fn uint qHash(const QByteArray &key)
+    \fn uint qHash(const QBitArray &key)
+    \relates QHash
+
+    Returns the hash value for the \a key.
+*/
+
+/*! \fn uint qHash(const QString &key)
+    \relates QHash
+
+    Returns the hash value for the \a key.
+*/
+
+/*! \fn uint qHash(const T *key)
+    \relates QHash
+
+    Returns the hash value for the \a key.
+*/
+
+/*!
     \class QHash
     \brief The QHash class is a template class that provides a hash-table-based dictionary.
 
@@ -401,7 +502,8 @@ void QHashData::checkSanity()
        key. With QHash, the items are arbitrarily ordered.
     \i The key type of a QMap must provide operator<(). The key
        type of a QHash must provide operator==() and a global
-       \l{qHash()}{qHash}(Key) function.
+       hash function called qHash() (see the related non-member
+       functions).
     \endlist
 
     Here's an example QHash with QString keys and \c int values:
@@ -732,7 +834,6 @@ void QHashData::checkSanity()
 */
 
 /*! \fn const T QHash::value(const Key &key, const T &defaultValue) const
-
     \overload
 
     If the hash contains no item with the given \a key, the function returns
@@ -1490,121 +1591,6 @@ void QHashData::checkSanity()
     \sa operator+=(), operator-()
 */
 
-/*! \fn uint qHash(char key)
-    \relates QHash
-
-    Returns the hash value for the \a key.
-*/
-
-/*! \fn uint qHash(uchar key)
-    \relates QHash
-    \overload
-
-    Returns the hash value for the \a key.
-*/
-
-/*! \fn uint qHash(signed char key)
-    \relates QHash
-    \overload
-
-    Returns the hash value for the \a key.
-*/
-
-/*! \fn uint qHash(ushort key)
-    \relates QHash
-    \overload
-
-    Returns the hash value for the \a key.
-*/
-
-/*! \fn uint qHash(short key)
-    \relates QHash
-    \overload
-
-    Returns the hash value for the \a key.
-*/
-
-/*! \fn uint qHash(uint key)
-    \relates QHash
-    \overload
-
-    Returns the hash value for the \a key.
-*/
-
-/*! \fn uint qHash(int key)
-    \relates QHash
-    \overload
-
-    Returns the hash value for the \a key.
-*/
-
-/*! \fn uint qHash(ulong key)
-    \relates QHash
-    \overload
-
-    Returns the hash value for the \a key.
-*/
-
-/*! \fn uint qHash(long key)
-    \relates QHash
-    \overload
-
-    Returns the hash value for the \a key.
-*/
-
-/*! \fn uint qHash(quint64 key)
-    \relates QHash
-    \overload
-
-    Returns the hash value for the \a key.
-*/
-
-/*! \fn uint qHash(qint64 key)
-    \relates QHash
-    \overload
-
-    Returns the hash value for the \a key.
-*/
-
-/*! \fn uint qHash(QChar key)
-    \relates QHash
-    \overload
-
-    Returns the hash value for the \a key.
-*/
-
-/*! \fn uint qHash(const QByteArray &key)
-    \fn uint qHash(const QBitArray &key)
-    \relates QHash
-    \overload
-
-    Returns the hash value for the \a key.
-*/
-
-/*! \fn uint qHash(const QString &key)
-    \relates QHash
-    \overload
-
-    Returns the hash value for the \a key.
-*/
-
-/*! \fn uint qHash(const T *key)
-    \relates QHash
-    \overload
-
-    Returns the hash value for the \a key.
-*/
-
-/*!
-    \fn uint qHash(const QPair<T1, T2> &key)
-    \relates QHash
-    \since 4.3
-
-    Returns the hash value for the \a key.
-
-    Types \c T1 and \c T2 must be supported by qHash().
-*/
-
 /*! \fn QDataStream &operator<<(QDataStream &out, const QHash<Key, T>& hash)
     \relates QHash
 
diff --git a/src/corelib/tools/qringbuffer_p.h b/src/corelib/tools/qringbuffer_p.h
index eed4ba9..02cc497 100644
--- a/src/corelib/tools/qringbuffer_p.h
+++ b/src/corelib/tools/qringbuffer_p.h
@@ -74,6 +74,52 @@ public:
         return buffers.isEmpty() ? 0 : (buffers.first().constData() + head);
     }
 
+    // access the bytes at a specified position
+    // the out-variable length will contain the amount of bytes readable
+    // from there, e.g. the amount still the same QByteArray
+    inline const char *readPointerAtPosition(qint64 pos, qint64 &length) const {
+        if (buffers.isEmpty()) {
+            length = 0;
+            return 0;
+        }
+
+        if (pos >= bufferSize) {
+            length = 0;
+            return 0;
+        }
+
+        // special case: it is in the first buffer
+        int nextDataBlockSizeValue = nextDataBlockSize();
+        if (pos - head < nextDataBlockSizeValue) {
+            length = nextDataBlockSizeValue - pos;
+            return buffers.at(0).constData() + head + pos;
+        }
+
+        // special case: we only had one buffer and tried to read over it
+        if (buffers.length() == 1) {
+            length = 0;
+            return 0;
+        }
+
+        // skip the first
+        pos -= nextDataBlockSizeValue;
+
+        // normal case: it is somewhere in the second to the-one-before-the-tailBuffer
+        for (int i = 1; i < tailBuffer; i++) {
+            if (pos >= buffers[i].size()) {
+                pos -= buffers[i].size();
+                continue;
+            }
+
+            length = buffers[i].length() - pos;
+            return buffers[i].constData() + pos;
+        }
+
+        // it is in the tail buffer
+        length = tail - pos;
+        return buffers[tailBuffer].constData() + pos;
+    }
+
     inline void free(int bytes) {
         bufferSize -= bytes;
         if (bufferSize < 0)
diff --git a/src/corelib/tools/qstring.cpp b/src/corelib/tools/qstring.cpp
index 375d672..c3649e3 100644
--- a/src/corelib/tools/qstring.cpp
+++ b/src/corelib/tools/qstring.cpp
@@ -743,7 +743,9 @@ int QString::grow(int size)
 /*!
     \since 4.2
 
-    Returns a copy of the \a string string encoded in ucs4.
+    Returns a copy of the \a string, where the encoding of \a string depends on 
+    the size of wchar. If wchar is 4 bytes, the \a string is interpreted as ucs-4,
+    if wchar is 2 bytes it is interpreted as ucs-2.
 
     If \a size is -1 (default), the \a string has to be 0 terminated.
 
diff --git a/src/corelib/tools/qtimeline.cpp b/src/corelib/tools/qtimeline.cpp
index 78ce7bd..ee4f73c 100644
--- a/src/corelib/tools/qtimeline.cpp
+++ b/src/corelib/tools/qtimeline.cpp
@@ -211,7 +211,9 @@ void QTimeLinePrivate::setCurrentTime(int msecs)
     valueForTime() and emitting valueChanged(). By default, valueForTime()
     applies an interpolation algorithm to generate these value. You can choose
     from a set of predefined timeline algorithms by calling
-    setCurveShape(). By default, QTimeLine uses the EaseInOut curve shape,
+    setCurveShape().
+   
+    Note that by default, QTimeLine uses the EaseInOut curve shape,
     which provides a value that grows slowly, then grows steadily, and
     finally grows slowly. For a custom timeline, you can reimplement
     valueForTime(), in which case QTimeLine's curveShape property is ignored.
diff --git a/src/corelib/tools/tools.pri b/src/corelib/tools/tools.pri
index 41557f0..2a1c1fc 100644
--- a/src/corelib/tools/tools.pri
+++ b/src/corelib/tools/tools.pri
@@ -20,6 +20,7 @@ HEADERS +=  \
 	tools/qlocale_p.h \
 	tools/qlocale_data_p.h \
 	tools/qmap.h \
+        tools/qcontiguouscache.h \
         tools/qpodlist_p.h \
         tools/qpoint.h \
 	tools/qqueue.h \
@@ -55,6 +56,7 @@ SOURCES += \
 	tools/qlocale.cpp \
         tools/qpoint.cpp \
 	tools/qmap.cpp \
+	tools/qcontiguouscache.cpp \
         tools/qrect.cpp \
 	tools/qregexp.cpp \
 	tools/qshareddata.cpp \
diff --git a/src/gui/dialogs/qsidebar.cpp b/src/gui/dialogs/qsidebar.cpp
index 26108d7..000a06b 100644
--- a/src/gui/dialogs/qsidebar.cpp
+++ b/src/gui/dialogs/qsidebar.cpp
@@ -249,9 +249,9 @@ void QUrlModel::addUrls(const QList<QUrl> &list, int row, bool move)
             continue;
         for (int j = 0; move && j < rowCount(); ++j) {
 #if defined(Q_OS_WIN)
-            if (index(j, 0).data(UrlRole).toUrl().toLocalFile().toLower() == url.toLocalFile().toLower()) {
+            if (QDir::cleanPath(index(j, 0).data(UrlRole).toUrl().toLocalFile()).toLower() == QDir::cleanPath(url.toLocalFile()).toLower()) {
 #else
-            if (index(j, 0).data(UrlRole) == url) {
+            if (QDir::cleanPath(index(j, 0).data(UrlRole).toUrl().toLocalFile()) == QDir::cleanPath(url.toLocalFile())) {
 #endif
                 removeRow(j);
                 if (j <= row)
diff --git a/src/gui/graphicsview/qgraphicsitem.cpp b/src/gui/graphicsview/qgraphicsitem.cpp
index ca112d7..3078792 100644
--- a/src/gui/graphicsview/qgraphicsitem.cpp
+++ b/src/gui/graphicsview/qgraphicsitem.cpp
@@ -2640,6 +2640,10 @@ QTransform QGraphicsItem::sceneTransform() const
 */
 QTransform QGraphicsItem::deviceTransform(const QTransform &viewportTransform) const
 {
+    // Ensure we return the standard transform if we're not untransformable.
+    if (!d_ptr->itemIsUntransformable())
+        return sceneTransform() * viewportTransform;
+
     // Find the topmost item that ignores view transformations.
     const QGraphicsItem *untransformedAncestor = this;
     QList<const QGraphicsItem *> parents;
diff --git a/src/gui/graphicsview/qgraphicsscene.cpp b/src/gui/graphicsview/qgraphicsscene.cpp
index bc5c091..c421f05 100644
--- a/src/gui/graphicsview/qgraphicsscene.cpp
+++ b/src/gui/graphicsview/qgraphicsscene.cpp
@@ -1330,8 +1330,7 @@ void QGraphicsScenePrivate::mousePressEventHandler(QGraphicsSceneMouseEvent *mou
         bool disabled = !item->isEnabled();
         bool isWindow = item->isWindow();
         if (mouseEvent->type() == QEvent::GraphicsSceneMouseDoubleClick
-            && item != lastMouseGrabberItem && lastMouseGrabberItem)
-        {
+            && item != lastMouseGrabberItem && lastMouseGrabberItem) {
             // If this item is different from the item that received the last
             // mouse event, and mouseEvent is a doubleclick event, then the
             // event is converted to a press. Known limitation:
@@ -2326,12 +2325,7 @@ void QGraphicsScene::render(QPainter *painter, const QRectF &target, const QRect
         // Calculate a simple level-of-detail metric.
         // ### almost identical code in QGraphicsView::paintEvent()
         //     and QGraphicsView::render() - consider refactoring
-        QTransform itemToDeviceTransform;
-        if (item->d_ptr->itemIsUntransformable()) {
-            itemToDeviceTransform = item->deviceTransform(painterTransform);
-        } else {
-            itemToDeviceTransform = item->sceneTransform() * painterTransform;
-        }
+        QTransform itemToDeviceTransform = item->deviceTransform(painterTransform);
 
         option.levelOfDetail = qSqrt(itemToDeviceTransform.map(v1).length() * itemToDeviceTransform.map(v2).length());
         option.matrix = itemToDeviceTransform.toAffine(); //### discards perspective
@@ -5135,11 +5129,7 @@ void QGraphicsScene::drawItems(QPainter *painter,
                 // optimization, but it's hit very rarely.
                 for (int i = clippers.size() - 1; i >= 0; --i) {
                     QGraphicsItem *clipper = clippers[i];
-                    if (clipper->d_ptr->itemIsUntransformable()) {
-                        painter->setWorldTransform(clipper->deviceTransform(viewTransform), false);
-                    } else {
-                        painter->setWorldTransform(clipper->sceneTransform() * viewTransform, false);
-                    }
+                    painter->setWorldTransform(clipper->deviceTransform(viewTransform), false);
 
                     childClippers.append(clipper);
                     painter->save();
@@ -5150,12 +5140,8 @@ void QGraphicsScene::drawItems(QPainter *painter,
         }
 
         // Set up the painter transform
-        if (item->d_ptr->itemIsUntransformable()) {
-            painter->setWorldTransform(item->deviceTransform(viewTransform), false);
-        } else {
-            painter->setWorldTransform(item->sceneTransform() * viewTransform, false);
-        }
-       
+        painter->setWorldTransform(item->deviceTransform(viewTransform), false);
+
         // Save painter
         bool saveState = (d->painterStateProtection || (item->flags() & QGraphicsItem::ItemClipsToShape));
         if (saveState)
diff --git a/src/gui/graphicsview/qgraphicsview.cpp b/src/gui/graphicsview/qgraphicsview.cpp
index 2876016..7181045 100644
--- a/src/gui/graphicsview/qgraphicsview.cpp
+++ b/src/gui/graphicsview/qgraphicsview.cpp
@@ -1163,11 +1163,7 @@ void QGraphicsViewPrivate::generateStyleOptions(const QList<QGraphicsItem *> &it
         // Calculate a simple level-of-detail metric.
         // ### almost identical code in QGraphicsScene::render()
         //     and QGraphicsView::render() - consider refactoring
-        if (item->d_ptr->itemIsUntransformable()) {
-            itemToViewportTransform = item->deviceTransform(worldTransform);
-        } else {
-            itemToViewportTransform = item->sceneTransform() * worldTransform;
-        }
+        itemToViewportTransform = item->deviceTransform(worldTransform);
 
         if (itemToViewportTransform.type() <= QTransform::TxTranslate) {
             // Translation and rotation only? The LOD is 1.
@@ -1691,6 +1687,7 @@ void QGraphicsView::setScene(QGraphicsScene *scene)
         disconnect(d->scene, SIGNAL(sceneRectChanged(QRectF)),
                    this, SLOT(updateSceneRect(QRectF)));
         d->scene->d_func()->views.removeAll(this);
+        d->connectedToScene = false;
     }
 
     // Assign the new scene and update the contents (scrollbars, etc.)).
@@ -2175,12 +2172,7 @@ void QGraphicsView::render(QPainter *painter, const QRectF &target, const QRect
         // Calculate a simple level-of-detail metric.
         // ### almost identical code in QGraphicsScene::render()
         //     and QGraphicsView::paintEvent() - consider refactoring
-        QTransform itemToViewportTransform;
-        if (item->d_ptr->itemIsUntransformable()) {
-            itemToViewportTransform = item->deviceTransform(painterMatrix);
-        } else {
-            itemToViewportTransform = item->sceneTransform() * painterMatrix;
-        }
+        QTransform itemToViewportTransform = item->deviceTransform(painterMatrix);
 
         option->levelOfDetail = qSqrt(itemToViewportTransform.map(v1).length() * itemToViewportTransform.map(v2).length());
         option->matrix = itemToViewportTransform.toAffine();
diff --git a/src/gui/image/qicon.cpp b/src/gui/image/qicon.cpp
index 0514567..b2b8c13 100644
--- a/src/gui/image/qicon.cpp
+++ b/src/gui/image/qicon.cpp
@@ -856,6 +856,9 @@ void QIcon::addPixmap(const QPixmap &pixmap, Mode mode, State state)
     QImageWriter::supportedImageFormats() functions to retrieve a
     complete list of the supported file formats.
 
+    Note: When you add a non-empty filename to a QIcon, the icon becomes
+    non-null, even if the file doesn't exist or points to a corrupt file.
+
     \sa addPixmap()
  */
 void QIcon::addFile(const QString &fileName, const QSize &size, Mode mode, State state)
diff --git a/src/gui/image/qpixmap_win.cpp b/src/gui/image/qpixmap_win.cpp
index 20bed02..d4ebef7 100644
--- a/src/gui/image/qpixmap_win.cpp
+++ b/src/gui/image/qpixmap_win.cpp
@@ -319,6 +319,7 @@ static QImage qt_fromWinHBITMAP(HDC hdc, HBITMAP bitmap, int w, int h)
     } else {
         qWarning("qt_fromWinHBITMAP(), failed to get bitmap bits");
     }
+    qFree(data);
 
     return image;
 }
diff --git a/src/gui/itemviews/qfileiconprovider.cpp b/src/gui/itemviews/qfileiconprovider.cpp
index 9f33af3..054f4cf 100644
--- a/src/gui/itemviews/qfileiconprovider.cpp
+++ b/src/gui/itemviews/qfileiconprovider.cpp
@@ -416,26 +416,22 @@ QString QFileIconProvider::type(const QFileInfo &info) const
     }
 
     if (info.isDir())
-        return QApplication::translate("QFileDialog",
 #ifdef Q_WS_WIN
-                                       "File Folder", "Match Windows Explorer"
+        return QApplication::translate("QFileDialog", "File Folder", "Match Windows Explorer");
 #else
-                                       "Folder", "All other platforms"
+        return QApplication::translate("QFileDialog", "Folder", "All other platforms");
 #endif
-            );
     // Windows   - "File Folder"
     // OS X      - "Folder"
     // Konqueror - "Folder"
     // Nautilus  - "folder"
 
     if (info.isSymLink())
-        return QApplication::translate("QFileDialog",
 #ifdef Q_OS_MAC
-                                       "Alias", "Mac OS X Finder"
+        return QApplication::translate("QFileDialog", "Alias", "Mac OS X Finder");
 #else
-                                       "Shortcut", "All other platforms"
+        return QApplication::translate("QFileDialog", "Shortcut", "All other platforms");
 #endif
-            );
     // OS X      - "Alias"
     // Windows   - "Shortcut"
     // Konqueror - "Folder" or "TXT File" i.e. what it is pointing to
diff --git a/src/gui/itemviews/qlistview.cpp b/src/gui/itemviews/qlistview.cpp
index 3e00cd0..1071c1d 100644
--- a/src/gui/itemviews/qlistview.cpp
+++ b/src/gui/itemviews/qlistview.cpp
@@ -1608,6 +1608,10 @@ QRegion QListView::visualRegionForSelection(const QItemSelection &selection) con
         if (!selection.at(i).isValid())
             continue;
         QModelIndex parent = selection.at(i).topLeft().parent();
+        //we only display the children of the root in a listview
+        //we're not interested in the other model indexes
+        if (parent != d->root)
+            continue;
         int t = selection.at(i).topLeft().row();
         int b = selection.at(i).bottomRight().row();
         if (d->viewMode == IconMode || d->isWrapping()) { // in non-static mode, we have to go through all selected items
@@ -1616,8 +1620,8 @@ QRegion QListView::visualRegionForSelection(const QItemSelection &selection) con
         } else { // in static mode, we can optimize a bit
             while (t <= b && d->isHidden(t)) ++t;
             while (b >= t && d->isHidden(b)) --b;
-            const QModelIndex top = d->model->index(t, c, d->root);
-            const QModelIndex bottom = d->model->index(b, c, d->root);
+            const QModelIndex top = d->model->index(t, c, parent);
+            const QModelIndex bottom = d->model->index(b, c, parent);
             QRect rect(visualRect(top).topLeft(),
                        visualRect(bottom).bottomRight());
             selectionRegion += QRegion(rect);
diff --git a/src/gui/itemviews/qtreeview.cpp b/src/gui/itemviews/qtreeview.cpp
index f6c5cf0..d742698 100644
--- a/src/gui/itemviews/qtreeview.cpp
+++ b/src/gui/itemviews/qtreeview.cpp
@@ -3086,10 +3086,6 @@ void QTreeViewPrivate::layout(int i)
     Q_Q(QTreeView);
     QModelIndex current;
     QModelIndex parent = (i < 0) ? (QModelIndex)root : modelIndex(i);
-    // modelIndex() will return an index that don't have a parent if column 0 is hidden,
-    // so we must make sure that parent points to the actual parent that has children.
-    if (parent != root)
-        parent = model->index(parent.row(), 0, parent.parent());
 
     if (i>=0 && !parent.isValid()) {
         //modelIndex() should never return something invalid for the real items.
diff --git a/src/gui/kernel/qapplication.cpp b/src/gui/kernel/qapplication.cpp
index 27dfab6..a9424db 100644
--- a/src/gui/kernel/qapplication.cpp
+++ b/src/gui/kernel/qapplication.cpp
@@ -2028,12 +2028,10 @@ QWidget *QApplication::focusWidget()
 
 void QApplicationPrivate::setFocusWidget(QWidget *focus, Qt::FocusReason reason)
 {
-    if (focus && focus->window()
 #ifndef QT_NO_GRAPHICSVIEW
-        && focus->window()->graphicsProxyWidget()
-#endif
-       )
+    if (focus && focus->window()->graphicsProxyWidget())
         return;
+#endif
 
     hidden_focus_widget = 0;
 
diff --git a/src/gui/kernel/qdnd_x11.cpp b/src/gui/kernel/qdnd_x11.cpp
index ed93b34..9b2305d 100644
--- a/src/gui/kernel/qdnd_x11.cpp
+++ b/src/gui/kernel/qdnd_x11.cpp
@@ -543,7 +543,7 @@ bool QX11Data::xdndMimeDataForAtom(Atom a, QMimeData *mimeData, QByteArray *data
                             (dm->xdndMimeTransferedPixmapIndex + 1) % 2;
             }
         } else {
-            DEBUG("QClipboard: xdndMimeDataForAtom(): converting to type '%s' is not supported", atomName);
+            DEBUG("QClipboard: xdndMimeDataForAtom(): converting to type '%s' is not supported", qPrintable(atomName));
         }
     }
     return data;
@@ -624,7 +624,6 @@ QVariant QX11Data::xdndMimeConvertToFormat(Atom a, const QByteArray &data, const
     if (format == QLatin1String("image/ppm")) {
         if (a == XA_PIXMAP && data.size() == sizeof(Pixmap)) {
             Pixmap xpm = *((Pixmap*)data.data());
-            Display *dpy = display;
             if (!xpm)
                 return QByteArray();
             QPixmap qpm = QPixmap::fromX11Pixmap(xpm);
diff --git a/src/gui/kernel/qevent.cpp b/src/gui/kernel/qevent.cpp
index a77325c..c8d40d8 100644
--- a/src/gui/kernel/qevent.cpp
+++ b/src/gui/kernel/qevent.cpp
@@ -714,12 +714,13 @@ QWheelEvent::QWheelEvent(const QPoint &pos, const QPoint& globalPos, int delta,
     The \a type parameter must be QEvent::KeyPress, QEvent::KeyRelease,
     or QEvent::ShortcutOverride.
 
-    If \a key is 0, the event is not a result of
-    a known key; for example, it may be the result of a compose
-    sequence or keyboard macro. The \a modifiers holds the keyboard
-    modifiers, and the given \a text is the Unicode text that the
-    key generated. If \a autorep is true, isAutoRepeat() will be
-    true. \a count is the number of keys involved in the event.
+    Int \a key is the code for the Qt::Key that the event loop should listen 
+    for. If \a key is 0, the event is not a result of a known key; for 
+    example, it may be the result of a compose sequence or keyboard macro.
+    The \a modifiers holds the keyboard modifiers, and the given \a text 
+    is the Unicode text that the key generated. If \a autorep is true, 
+    isAutoRepeat() will be true. \a count is the number of keys involved 
+    in the event.
 */
 QKeyEvent::QKeyEvent(Type type, int key, Qt::KeyboardModifiers modifiers, const QString& text,
                      bool autorep, ushort count)
diff --git a/src/gui/kernel/qlayoutitem.cpp b/src/gui/kernel/qlayoutitem.cpp
index 0fd73b8..c70ab2d 100644
--- a/src/gui/kernel/qlayoutitem.cpp
+++ b/src/gui/kernel/qlayoutitem.cpp
@@ -54,7 +54,8 @@ QT_BEGIN_NAMESPACE
 
 inline static QRect fromLayoutItemRect(QWidgetPrivate *priv, const QRect &rect)
 {
-    return priv->fromOrToLayoutItemRect(rect, -1);
+    return rect.adjusted(priv->leftLayoutItemMargin, priv->topLayoutItemMargin,
+                         -priv->rightLayoutItemMargin, -priv->bottomLayoutItemMargin);
 }
 
 inline static QSize fromLayoutItemSize(QWidgetPrivate *priv, const QSize &size)
@@ -64,7 +65,8 @@ inline static QSize fromLayoutItemSize(QWidgetPrivate *priv, const QSize &size)
 
 inline static QRect toLayoutItemRect(QWidgetPrivate *priv, const QRect &rect)
 {
-    return priv->fromOrToLayoutItemRect(rect, +1);
+    return rect.adjusted(-priv->leftLayoutItemMargin, -priv->topLayoutItemMargin,
+                         priv->rightLayoutItemMargin, priv->bottomLayoutItemMargin);
 }
 
 inline static QSize toLayoutItemSize(QWidgetPrivate *priv, const QSize &size)
diff --git a/src/gui/kernel/qshortcutmap.cpp b/src/gui/kernel/qshortcutmap.cpp
index b6703e2..f998bb2 100644
--- a/src/gui/kernel/qshortcutmap.cpp
+++ b/src/gui/kernel/qshortcutmap.cpp
@@ -751,6 +751,7 @@ bool QShortcutMap::correctGraphicsWidgetContext(Qt::ShortcutContext context, QGr
                 tw = tw->parentWidget();
             return tw == w;
         }
+        return false;
     }
 
     // Below is Qt::WindowShortcut context
diff --git a/src/gui/kernel/qwidget.cpp b/src/gui/kernel/qwidget.cpp
index b50eb24..e52a517 100644
--- a/src/gui/kernel/qwidget.cpp
+++ b/src/gui/kernel/qwidget.cpp
@@ -167,39 +167,48 @@ static inline bool bypassGraphicsProxyWidget(QWidget *p)
 extern bool qt_sendSpontaneousEvent(QObject*, QEvent*); // qapplication.cpp
 extern QDesktopWidget *qt_desktopWidget; // qapplication.cpp
 
-QWidgetPrivate::QWidgetPrivate(int version) :
-        QObjectPrivate(version), extra(0), focus_child(0)
-        ,layout(0), widgetItem(0)
-        ,leftmargin(0), topmargin(0), rightmargin(0), bottommargin(0)
-        ,leftLayoutItemMargin(0), topLayoutItemMargin(0), rightLayoutItemMargin(0)
-        ,bottomLayoutItemMargin(0)
-        ,fg_role(QPalette::NoRole)
-        ,bg_role(QPalette::NoRole)
-        ,hd(0)
-        ,dirty(0)
-        ,needsFlush(0)
-        ,dirtyOpaqueChildren(1)
-        ,isOpaque(0)
-        ,inDirtyList(0)
-        ,isScrolled(0)
-        ,isMoved(0)
-        ,usesDoubleBufferedGLContext(0)
-#ifdef Q_WS_WIN
-        ,noPaintOnScreen(0)
-#endif
-        ,inheritedFontResolveMask(0)
-        ,inheritedPaletteResolveMask(0)
+QWidgetPrivate::QWidgetPrivate(int version)
+    : QObjectPrivate(version)
+      , extra(0)
+      , focus_next(0)
+      , focus_prev(0)
+      , focus_child(0)
+      , layout(0)
+      , needsFlush(0)
+      , redirectDev(0)
+      , widgetItem(0)
+      , extraPaintEngine(0)
+      , polished(0)
+      , inheritedFontResolveMask(0)
+      , inheritedPaletteResolveMask(0)
+      , leftmargin(0)
+      , topmargin(0)
+      , rightmargin(0)
+      , bottommargin(0)
+      , leftLayoutItemMargin(0)
+      , topLayoutItemMargin(0)
+      , rightLayoutItemMargin(0)
+      , bottomLayoutItemMargin(0)
+      , hd(0)
+      , size_policy(QSizePolicy::Preferred, QSizePolicy::Preferred)
+      , fg_role(QPalette::NoRole)
+      , bg_role(QPalette::NoRole)
+      , dirtyOpaqueChildren(1)
+      , isOpaque(0)
+      , inDirtyList(0)
+      , isScrolled(0)
+      , isMoved(0)
+      , usesDoubleBufferedGLContext(0)
 #if defined(Q_WS_X11)
-        ,picture(0)
+      , picture(0)
+#elif defined(Q_WS_WIN)
+      , noPaintOnScreen(0)
+#elif defined(Q_WS_MAC)
+      , needWindowChange(0)
+      , isGLWidget(0)
+      , window_event(0)
+      , qd_hd(0)
 #endif
-#ifdef Q_WS_MAC
-        ,needWindowChange(0)
-        ,isGLWidget(0)
-#endif
-        ,polished(0)
-
-        , size_policy(QSizePolicy::Preferred, QSizePolicy::Preferred)
-        , redirectDev(0)
 {
     if (!qApp) {
         qFatal("QWidget: Must construct a QApplication before a QPaintDevice");
@@ -1345,7 +1354,7 @@ QWidget::~QWidget()
     d->setDirtyOpaqueRegion();
 
     if (isWindow() && isVisible() && internalWinId())
-        hide();
+        d->close_helper(QWidgetPrivate::CloseNoEvent);
 #if defined(Q_WS_WIN) || defined(Q_WS_X11)
     else if (!internalWinId() && isVisible())
         qApp->d_func()->sendSyntheticEnterLeave(this);
@@ -1412,36 +1421,26 @@ void QWidgetPrivate::createTLExtra()
         createExtra();
     if (!extra->topextra) {
         QTLWExtra* x = extra->topextra = new QTLWExtra;
+        x->icon = 0;
+        x->iconPixmap = 0;
+        x->backingStore = 0;
         x->windowSurface = 0;
+        x->sharedPainter = 0;
+        x->incw = x->inch = 0;
+        x->basew = x->baseh = 0;
+        x->frameStrut.setCoords(0, 0, 0, 0);
+        x->normalGeometry = QRect(0,0,-1,-1);
+        x->savedFlags = 0;
         x->opacity = 255;
         x->posFromMove = false;
         x->sizeAdjusted = false;
         x->inTopLevelResize = false;
         x->inRepaint = false;
-        x->backingStore = 0;
-        x->icon = 0;
-        x->iconPixmap = 0;
-        x->frameStrut.setCoords(0, 0, 0, 0);
-        x->incw = x->inch = 0;
-        x->basew = x->baseh = 0;
-        x->normalGeometry = QRect(0,0,-1,-1);
-#if defined(Q_WS_WIN) || defined(Q_WS_X11) || defined(Q_WS_MAC)
         x->embedded = 0;
-#endif
-#if defined(Q_WS_X11)
-        x->parentWinId = 0;
-        x->spont_unmapped = 0;
-        x->dnd = 0;
-#endif
-        x->savedFlags = 0;
-#if defined(Q_WS_QWS) && !defined(QT_NO_QWS_MANAGER)
-        x->qwsManager = 0;
-#endif
-        x->sharedPainter = 0;
         createTLSysExtra();
 #ifdef QWIDGET_EXTRA_DEBUG
-    static int count = 0;
-    qDebug() << "tlextra" << ++count;
+        static int count = 0;
+        qDebug() << "tlextra" << ++count;
 #endif
     }
 }
@@ -1455,27 +1454,28 @@ void QWidgetPrivate::createExtra()
 {
     if (!extra) {                                // if not exists
         extra = new QWExtra;
-        extra->minw = extra->minh = 0;
-        extra->maxw = extra->maxh = QWIDGETSIZE_MAX;
+        extra->glContext = 0;
+        extra->topextra = 0;
+        extra->proxyWidget = 0;
+#ifndef QT_NO_CURSOR
+        extra->curs = 0;
+#endif
+        extra->minw = 0;
+        extra->minh = 0;
+        extra->maxw = QWIDGETSIZE_MAX;
+        extra->maxh = QWIDGETSIZE_MAX;
+        extra->customDpiX = 0;
+        extra->customDpiY = 0;
         extra->explicitMinSize = 0;
         extra->explicitMaxSize = 0;
         extra->autoFillBackground = 0;
         extra->nativeChildrenForced = 0;
         extra->inRenderWithPainter = 0;
         extra->hasMask = 0;
-#ifndef QT_NO_CURSOR
-        extra->curs = 0;
-#endif
-        extra->style = 0;
-        extra->topextra = 0;
-        extra->proxyWidget = 0;
-        extra->glContext = 0;
-        extra->customDpiX = 0;
-        extra->customDpiY = 0;
         createSysExtra();
 #ifdef QWIDGET_EXTRA_DEBUG
-    static int count = 0;
-    qDebug() << "extra" << ++count;
+        static int count = 0;
+        qDebug() << "extra" << ++count;
 #endif
     }
 }
@@ -1516,45 +1516,6 @@ void QWidgetPrivate::deleteExtra()
 }
 
 /*
-  Returns true if the background is inherited; otherwise returns
-  false.
-
-  Mainly used in the paintOnScreen case.
-*/
-
-bool QWidgetPrivate::isBackgroundInherited() const
-{
-    Q_Q(const QWidget);
-
-    // windows do not inherit their background
-    if (q->isWindow() || q->windowType() == Qt::SubWindow)
-        return false;
-
-    if (q->testAttribute(Qt::WA_NoSystemBackground) || q->testAttribute(Qt::WA_OpaquePaintEvent))
-        return false;
-
-    const QPalette &pal = q->palette();
-    QPalette::ColorRole bg = q->backgroundRole();
-    QBrush brush = pal.brush(bg);
-
-    // non opaque brushes leaves us no choice, we must inherit
-    if (!q->autoFillBackground() || !brush.isOpaque())
-        return true;
-
-    if (brush.style() == Qt::SolidPattern) {
-        // the background is just a solid color. If there is no
-        // propagated contents, then we claim as performance
-        // optimization that it was not inheritet. This is the normal
-        // case in standard Windows or Motif style.
-        const QWidget *w = q->parentWidget();
-        if (!w->d_func()->isBackgroundInherited())
-            return false;
-    }
-
-    return true;
-}
-
-/*
   Returns true if there are widgets above this which overlap with
   \a rect, which is in parent's coordinate system (same as crect).
 */
@@ -1900,24 +1861,6 @@ void QWidgetPrivate::clipToEffectiveMask(QRegion &region) const
     }
 }
 
-bool QWidgetPrivate::hasBackground() const
-{
-    Q_Q(const QWidget);
-    if (!q->isWindow() && q->parentWidget() && q->parentWidget()->testAttribute(Qt::WA_PaintOnScreen))
-        return true;
-    if (q->testAttribute(Qt::WA_PaintOnScreen))
-        return true;
-    if (!q->testAttribute(Qt::WA_OpaquePaintEvent) && !q->testAttribute(Qt::WA_NoSystemBackground)) {
-        const QPalette &pal = q->palette();
-        QPalette::ColorRole bg = q->backgroundRole();
-        QBrush bgBrush = pal.brush(bg);
-        return (bgBrush.style() != Qt::NoBrush &&
-                ((q->isWindow() || q->windowType() == Qt::SubWindow)
-                 || (QPalette::ColorRole(bg_role) != QPalette::NoRole || (pal.resolve() & (1<<bg)))));
-    }
-    return false;
-}
-
 bool QWidgetPrivate::paintOnScreen() const
 {
 #if defined(Q_WS_QWS)
@@ -6157,14 +6100,6 @@ int QWidgetPrivate::pointToRect(const QPoint &p, const QRect &r)
     return dx + dy;
 }
 
-QRect QWidgetPrivate::fromOrToLayoutItemRect(const QRect &rect, int sign) const
-{
-    QRect r = rect;
-    r.adjust(-sign * leftLayoutItemMargin, -sign * topLayoutItemMargin,
-             +sign * rightLayoutItemMargin, +sign * bottomLayoutItemMargin);
-    return r;
-}
-
 /*!
     \property QWidget::frameSize
     \brief the size of the widget including any window frame
diff --git a/src/gui/kernel/qwidget_mac.mm b/src/gui/kernel/qwidget_mac.mm
index 1896b97..cc291e3 100644
--- a/src/gui/kernel/qwidget_mac.mm
+++ b/src/gui/kernel/qwidget_mac.mm
@@ -728,6 +728,7 @@ static OSWindowRef qt_mac_create_window(QWidget *, WindowClass wclass, WindowAtt
 static EventTypeSpec window_events[] = {
     { kEventClassWindow, kEventWindowClose },
     { kEventClassWindow, kEventWindowExpanded },
+    { kEventClassWindow, kEventWindowHidden },
     { kEventClassWindow, kEventWindowZoomed },
     { kEventClassWindow, kEventWindowCollapsed },
     { kEventClassWindow, kEventWindowToolbarSwitchMode },
@@ -780,16 +781,6 @@ OSStatus QWidgetPrivate::qt_window_event(EventHandlerCallRef er, EventRef event,
             // By also setting the current modal window back into the event, we
             // help Carbon determining which window is supposed to be raised.
             handled_event = qApp->activePopupWidget() ? true : false;
-            QWidget *top = 0;
-            if (!QApplicationPrivate::tryModalHelper(widget, &top) && top && top != widget){
-                if(!qt_mac_is_macsheet(top) || top->parentWidget() != widget) {
-                    handled_event = true;
-                    WindowPtr topWindowRef = qt_mac_window_for(top);
-                    SetEventParameter(event, kEventParamModalWindow, typeWindowRef, sizeof(topWindowRef), &topWindowRef);
-                    HIModalClickResult clickResult = kHIModalClickIsModal;
-                    SetEventParameter(event, kEventParamModalClickResult, typeModalClickResult, sizeof(clickResult), &clickResult);
-                }
-            }
 #endif
         } else if(ekind == kEventWindowClose) {
             widget->d_func()->close_helper(QWidgetPrivate::CloseWithSpontaneousEvent);
@@ -997,6 +988,19 @@ OSStatus QWidgetPrivate::qt_window_event(EventHandlerCallRef er, EventRef event,
                     }
                 }
             }
+        } else if (ekind == kEventWindowHidden) {
+            // Make sure that we also hide any visible sheets on our window.
+            // Cocoa does the right thing for us.
+            const QObjectList children = widget->children();
+            const int childCount = children.count();
+            for (int i = 0; i < childCount; ++i) {
+                QObject *obj = children.at(i);
+                if (obj->isWidgetType()) {
+                    QWidget *widget = static_cast<QWidget *>(obj);
+                    if (qt_mac_is_macsheet(widget) && widget->isVisible())
+                        widget->hide();
+                }
+            }
         } else {
             handled_event = false;
         }
@@ -1599,24 +1603,6 @@ bool QWidgetPrivate::qt_create_root_win()
     return true;
 }
 
-bool QWidgetPrivate::qt_recreate_root_win()
-{
-    if(!qt_root_win) //sanity check
-        return false;
-    //store old
-    OSWindowRef old_root_win = qt_root_win;
-    //recreate
-    qt_root_win = 0;
-    qt_create_root_win();
-    //cleanup old window
-#ifdef QT_MAC_USE_COCOA
-    [old_root_win release];
-#else
-    CFRelease(old_root_win);
-#endif
-    return true;
-}
-
 bool QWidgetPrivate::qt_widget_rgn(QWidget *widget, short wcode, RgnHandle rgn, bool force = false)
 {
     bool ret = false;
@@ -4438,11 +4424,13 @@ void QWidgetPrivate::deleteSysExtra()
 
 void QWidgetPrivate::createTLSysExtra()
 {
+    extra->topextra->resizer = 0;
+    extra->topextra->isSetGeometry = 0;
+    extra->topextra->isMove = 0;
+    extra->topextra->wattr = 0;
     extra->topextra->wclass = 0;
     extra->topextra->group = 0;
     extra->topextra->windowIcon = 0;
-    extra->topextra->resizer = 0;
-    extra->topextra->isSetGeometry = 0;
     extra->topextra->savedWindowAttributesFromMaximized = 0;
 }
 
diff --git a/src/gui/kernel/qwidget_p.h b/src/gui/kernel/qwidget_p.h
index 8c6a234..bf4f091 100644
--- a/src/gui/kernel/qwidget_p.h
+++ b/src/gui/kernel/qwidget_p.h
@@ -99,88 +99,92 @@ class QWidgetItemV2;
 class QStyle;
 
 struct QTLWExtra {
+    // *************************** Cross-platform variables *****************************
+
+    // Regular pointers (keep them together to avoid gaps on 64 bits architectures).
+    QIcon *icon; // widget icon
+    QPixmap *iconPixmap;
+    QWidgetBackingStore *backingStore;
+    QWindowSurface *windowSurface;
+    QPainter *sharedPainter;
+
+    // Implicit pointers (shared_null).
     QString caption; // widget caption
     QString iconText; // widget icon text
     QString role; // widget role
     QString filePath; // widget file path
-    QIcon *icon; // widget icon
-    QPixmap *iconPixmap;
+
+    // Other variables.
     short incw, inch; // size increments
+    short basew, baseh; // base sizes
      // frame strut, don't use these directly, use QWidgetPrivate::frameStrut() instead.
     QRect frameStrut;
+    QRect normalGeometry; // used by showMin/maximized/FullScreen
+    Qt::WindowFlags savedFlags; // Save widget flags while showing fullscreen
+
+    // *************************** Cross-platform bit fields ****************************
     uint opacity : 8;
     uint posFromMove : 1;
     uint sizeAdjusted : 1;
     uint inTopLevelResize : 1;
     uint inRepaint : 1;
-    QWidgetBackingStore *backingStore;
-#if defined(Q_WS_WIN)
-    ulong savedFlags; // Save window flags while showing fullscreen
-    uint embedded : 1; // window is embedded in another application
-#else
-    Qt::WindowFlags savedFlags; // Save widget flags while showing fullscreen
-#endif
-    short basew, baseh; // base sizes
-#if defined(Q_WS_X11)
-    WId parentWinId; // parent window Id (valid after reparenting)
-    uint embedded : 1; // window is embedded in another Qt application
+    uint embedded : 1;
+
+    // *************************** Platform specific values (bit fields first) **********
+#if defined(Q_WS_X11) // <----------------------------------------------------------- X11
     uint spont_unmapped: 1; // window was spontaneously unmapped
     uint dnd : 1; // DND properties installed
     uint validWMState : 1; // is WM_STATE valid?
     uint waitingForMapNotify : 1; // show() has been called, haven't got the MapNotify yet
+    WId parentWinId; // parent window Id (valid after reparenting)
     WId userTimeWindow; // window id that contains user-time timestamp when WM supports a _NET_WM_USER_TIME_WINDOW atom
     QPoint fullScreenOffset;
-#endif
-#if defined(Q_WS_MAC)
+#elif defined(Q_WS_WIN) // <--------------------------------------------------------- WIN
+    HICON winIconBig; // internal big Windows icon
+    HICON winIconSmall; // internal small Windows icon
+#elif defined(Q_WS_MAC) // <--------------------------------------------------------- MAC
+    uint resizer : 4;
+    uint isSetGeometry : 1;
+    uint isMove : 1;
     quint32 wattr;
     quint32 wclass;
     WindowGroupRef group;
     IconRef windowIcon; // the current window icon, if set with setWindowIcon_sys.
     quint32 savedWindowAttributesFromMaximized; // Saved attributes from when the calling updateMaximizeButton_sys()
-    uint resizer : 4;
-    uint isSetGeometry : 1;
-    uint isMove : 1;
-    uint embedded : 1;
-#endif
-#if defined(Q_WS_QWS) && !defined (QT_NO_QWS_MANAGER)
+#elif defined(Q_WS_QWS) // <--------------------------------------------------------- QWS
+#ifndef QT_NO_QWS_MANAGER
     QWSManager *qwsManager;
 #endif
-#if defined(Q_WS_WIN)
-    HICON winIconBig; // internal big Windows icon
-    HICON winIconSmall; // internal small Windows icon
 #endif
-    QRect normalGeometry; // used by showMin/maximized/FullScreen
-    QWindowSurface *windowSurface;
-    QPainter *sharedPainter;
 };
 
 struct QWExtra {
-    qint32 minw, minh; // minimum size
-    qint32 maxw, maxh; // maximum size
-    QPointer<QWidget> focus_proxy;
-#ifndef QT_NO_CURSOR
-    QCursor *curs;
-#endif
+    // *************************** Cross-platform variables *****************************
+
+    // Regular pointers (keep them together to avoid gaps on 64 bits architectures).
+    void *glContext; // if the widget is hijacked by QGLWindowSurface
     QTLWExtra *topextra; // only useful for TLWs
     QGraphicsProxyWidget *proxyWidget; // if the widget is embedded
-    void *glContext; // if the widget is hijacked by QGLWindowSurface
-#if defined(Q_WS_WIN) && !defined(QT_NO_DRAGANDDROP)
-    QOleDropTarget *dropTarget; // drop target
-    QList<QPointer<QWidget> > oleDropWidgets;
-#endif
-#if defined(Q_WS_X11)
-    WId xDndProxy; // XDND forwarding to embedded windows
+#ifndef QT_NO_CURSOR
+    QCursor *curs;
 #endif
+    QPointer<QStyle> style;
+    QPointer<QWidget> focus_proxy;
+
+    // Implicit pointers (shared_empty/shared_null).
     QRegion mask; // widget mask
+    QString styleSheet;
+
+    // Other variables.
+    qint32 minw;
+    qint32 minh; // minimum size
+    qint32 maxw;
+    qint32 maxh; // maximum size
+    quint16 customDpiX;
+    quint16 customDpiY;
     QSize staticContentsSize;
 
-//bit flags at the end to improve packing
-#if defined(Q_WS_WIN)
-    uint shown_mode : 8; // widget show mode
-#endif
-#if defined(Q_WS_X11)
-    uint compress_events : 1;
-#endif
+    // *************************** Cross-platform bit fields ****************************
     uint explicitMinSize : 2;
     uint explicitMaxSize : 2;
     uint autoFillBackground : 1;
@@ -188,16 +192,22 @@ struct QWExtra {
     uint inRenderWithPainter : 1;
     uint hasMask : 1;
 
-    QPointer<QStyle> style;
-    QString styleSheet;
-
-    quint16 customDpiX;
-    quint16 customDpiY;
-#if defined(Q_WS_MAC) && defined(QT_MAC_USE_COCOA)
+    // *************************** Platform specific values (bit fields first) **********
+#if defined(Q_WS_WIN) // <----------------------------------------------------------- WIN
+#ifndef QT_NO_DRAGANDDROP
+    QOleDropTarget *dropTarget; // drop target
+    QList<QPointer<QWidget> > oleDropWidgets;
+#endif
+#elif defined(Q_WS_X11) // <--------------------------------------------------------- X11
+    uint compress_events : 1;
+    WId xDndProxy; // XDND forwarding to embedded windows
+#elif defined(Q_WS_MAC) // <------------------------------------------------------ MAC
+#ifdef QT_MAC_USE_COCOA
     // Cocoa Mask stuff
     QImage maskBits;
     CGImageRef imageMask;
 #endif
+#endif
 };
 
 class Q_GUI_EXPORT QWidgetPrivate : public QObjectPrivate
@@ -205,6 +215,24 @@ class Q_GUI_EXPORT QWidgetPrivate : public QObjectPrivate
     Q_DECLARE_PUBLIC(QWidget)
 
 public:
+    // *************************** Cross-platform ***************************************
+    enum DrawWidgetFlags {
+        DrawAsRoot = 0x01,
+        DrawPaintOnScreen = 0x02,
+        DrawRecursive = 0x04,
+        DrawInvisible = 0x08,
+        DontSubtractOpaqueChildren = 0x10,
+        DontSetCompositionMode = 0x20,
+        DontDrawOpaqueChildren = 0x40
+    };
+
+    enum CloseMode {
+        CloseNoEvent,
+        CloseWithEvent,
+        CloseWithSpontaneousEvent
+    };
+
+    // Functions.
     explicit QWidgetPrivate(int version = QObjectPrivateVersion);
     ~QWidgetPrivate();
 
@@ -214,10 +242,6 @@ public:
     QPainter *sharedPainter() const;
     void setSharedPainter(QPainter *painter);
     QWidgetBackingStore *maybeBackingStore() const;
-#ifdef Q_WS_QWS
-    void setMaxWindowState_helper();
-    void setFullScreenSize_helper();
-#endif
     void init(QWidget *desktopWidget, Qt::WindowFlags f);
     void create_sys(WId window, bool initializeWindow, bool destroyOldWindow);
     void createRecursively();
@@ -238,24 +262,6 @@ public:
     QPalette naturalWidgetPalette(uint inheritedMask) const;
 
     void setMask_sys(const QRegion &);
-#ifdef Q_WS_WIN
-    bool shouldShowMaximizeButton();
-    void winUpdateIsOpaque();
-#endif
-
-#ifdef Q_WS_MAC
-    void macUpdateSizeAttribute();
-    void macUpdateHideOnSuspend();
-    void macUpdateOpaqueSizeGrip();
-    void macUpdateIgnoreMouseEvents();
-    void macUpdateMetalAttribute();
-    void macUpdateIsOpaque();
-    void setEnabled_helper_sys(bool enable);
-    bool isRealWindow() const;
-    void adjustWithinMaxAndMinSize(int &w, int &h);
-    void applyMaxAndMinSizeOnWindow();
-#endif
-
     void raise_sys();
     void lower_sys();
     void stackUnder_sys(QWidget *);
@@ -280,20 +286,9 @@ public:
     void setStyle_helper(QStyle *newStyle, bool propagate, bool metalHack = false);
     void inheritStyle();
 
-    bool isBackgroundInherited() const;
-
     void setUpdatesEnabled_helper(bool );
 
     void paintBackground(QPainter *, const QRegion &, const QPoint & = QPoint(), int flags = DrawAsRoot) const;
-    enum DrawWidgetFlags {
-        DrawAsRoot = 0x01,
-        DrawPaintOnScreen = 0x02,
-        DrawRecursive = 0x04,
-        DrawInvisible = 0x08,
-        DontSubtractOpaqueChildren = 0x10,
-        DontSetCompositionMode = 0x20,
-        DontDrawOpaqueChildren = 0x40
-    };
     bool isAboutToShow() const;
     QRegion prepareToRender(const QRegion &region, QWidget::RenderFlags renderFlags);
     void render_helper(QPainter *painter, const QPoint &targetOffset, const QRegion &sourceRegion,
@@ -316,10 +311,6 @@ public:
     QWindowSurface *createDefaultWindowSurface();
     QWindowSurface *createDefaultWindowSurface_sys();
     void repaint_sys(const QRegion &rgn);
-#ifdef Q_WS_MAC
-    void update_sys(const QRect &rect);
-    void update_sys(const QRegion &rgn);
-#endif
 
     QRect clipRect() const;
     QRegion clipRegion() const;
@@ -330,42 +321,20 @@ public:
     void updateIsOpaque();
     void setOpaque(bool opaque);
     void updateIsTranslucent();
-    bool hasBackground() const;
     bool paintOnScreen() const;
 
     QRegion getOpaqueRegion() const;
     const QRegion &getOpaqueChildren() const;
     void setDirtyOpaqueRegion();
 
-    QRegion opaqueChildren;
-
-    enum CloseMode {
-        CloseNoEvent,
-        CloseWithEvent,
-        CloseWithSpontaneousEvent
-    };
     bool close_helper(CloseMode mode);
 
-    bool compositeEvent(QEvent *e);
     void setWindowIcon_helper();
     void setWindowIcon_sys(bool forceReset = false);
     void setWindowOpacity_sys(qreal opacity);
-
     void adjustQuitOnCloseAttribute();
 
-#if defined(Q_WS_X11)
-    void setWindowRole();
-    void sendStartupMessage(const char *message) const;
-    void setNetWmWindowTypes();
-    void x11UpdateIsOpaque();
-#endif
-
-#if defined (Q_WS_WIN)
-    void reparentChildren();
-#endif
-
     void scrollChildren(int dx, int dy);
-
     void moveRect(const QRect &, int dx, int dy);
     void scrollRect(const QRect &, int dx, int dy);
     void invalidateBuffer_resizeHelper(const QPoint &oldPos, const QSize &oldSize);
@@ -379,7 +348,6 @@ public:
     void reparentFocusWidgets(QWidget *oldtlw);
 
     static int pointToRect(const QPoint &p, const QRect &r);
-    QRect fromOrToLayoutItemRect(const QRect &rect, int sign) const;
 
     void setWinId(WId);
     void showChildren(bool spontaneous);
@@ -389,9 +357,6 @@ public:
     void scroll_sys(int dx, int dy, const QRect &r);
     void deactivateWidgetCleanup();
     void setGeometry_sys(int, int, int, int, bool);
-#ifdef Q_WS_MAC
-    void setGeometry_sys_helper(int, int, int, int, bool);
-#endif
     void sendPendingMoveAndResizeEvents(bool recursive = false, bool disableUpdates = false);
     void activateChildLayoutsRecursively();
     void show_recursive();
@@ -403,10 +368,6 @@ public:
 
     void setEnabled_helper(bool);
     void registerDropSite(bool);
-#if defined(Q_WS_WIN) && !defined(QT_NO_DRAGANDDROP)
-    QOleDropTarget *registerOleDnd(QWidget *widget);
-    void unregisterOleDnd(QWidget *widget, QOleDropTarget *target);
-#endif
     static void adjustFlags(Qt::WindowFlags &flags, QWidget *w = 0);
 
     void updateFrameStrut();
@@ -416,32 +377,11 @@ public:
     void setWindowIconText_helper(const QString &cap);
     void setWindowTitle_sys(const QString &cap);
 
-#ifdef Q_OS_WIN
-    void grabMouseWhileInWindow();
-#endif
-
 #ifndef QT_NO_CURSOR
     void setCursor_sys(const QCursor &cursor);
     void unsetCursor_sys();
 #endif
 
-#ifdef Q_WS_MAC
-    void setWindowModified_sys(bool b);
-    void updateMaximizeButton_sys();
-    void setWindowFilePath_sys(const QString &filePath);
-    void createWindow_sys();
-    void recreateMacWindow();
-#ifndef QT_MAC_USE_COCOA
-    void initWindowPtr();
-    void finishCreateWindow_sys_Carbon(OSWindowRef windowRef);
-#else
-    void finishCreateWindow_sys_Cocoa(void * /*NSWindow * */ windowRef);
-    void syncCocoaMask();
-    void finishCocoaMaskSetup();
-#endif
-    void determineWindowClass();
-    void transferChildren();
-#endif
     void setWindowTitle_helper(const QString &cap);
     void setWindowFilePath_helper(const QString &filePath);
 
@@ -457,59 +397,89 @@ public:
 
     QInputContext *inputContext() const;
 
-#if defined(Q_WS_QWS)
-    void moveSurface(QWindowSurface *surface, const QPoint &offset);
+    void setModal_sys();
 
-    QRegion localRequestedRegion() const;
-    QRegion localAllocatedRegion() const;
+    inline void setRedirected(QPaintDevice *replacement, const QPoint &offset)
+    {
+        Q_ASSERT(q_func()->testAttribute(Qt::WA_WState_InPaintEvent));
+        redirectDev = replacement;
+        redirectOffset = offset;
+    }
 
-    void blitToScreen(const QRegion &globalrgn);
-#ifndef QT_NO_CURSOR
-    void updateCursor() const;
-#endif
+    inline QPaintDevice *redirected(QPoint *offset) const
+    {
+        if (offset)
+            *offset = redirectDev ? redirectOffset : QPoint();
+        return redirectDev;
+    }
 
-    QScreen* getScreen() const;
+    inline void restoreRedirected()
+    { redirectDev = 0; }
 
-    friend class QWSManager;
-    friend class QWSManagerPrivate;
-    friend class QDecoration;
-#endif
+    inline void enforceNativeChildren()
+    {
+        if (!extra)
+            createExtra();
 
-    static int instanceCounter; // Current number of widget instances
-    static int maxInstances; // Maximum number of widget instances
+        if (extra->nativeChildrenForced)
+            return;
+        extra->nativeChildrenForced = 1;
 
-#ifdef QT_KEYPAD_NAVIGATION
-    static QPointer<QWidget> editingWidget;
-#endif
+        for (int i = 0; i < children.size(); ++i) {
+            if (QWidget *child = qobject_cast<QWidget *>(children.at(i)))
+                child->setAttribute(Qt::WA_NativeWindow);
+        }
+    }
 
-    QWidgetData data;
+    inline bool nativeChildrenForced() const
+    {
+        return extra ? extra->nativeChildrenForced : false;
+    }
+
+    QSize adjustedSize() const;
+
+#ifndef Q_WS_QWS // Almost cross-platform :-)
+    void setWSGeometry(bool dontShow=false, const QRect &oldRect = QRect());
+
+    inline QPoint mapToWS(const QPoint &p) const
+    { return p - data.wrect.topLeft(); }
+
+    inline QPoint mapFromWS(const QPoint &p) const
+    { return p + data.wrect.topLeft(); }
+
+    inline QRect mapToWS(const QRect &r) const
+    { QRect rr(r); rr.translate(-data.wrect.topLeft()); return rr; }
+
+    inline QRect mapFromWS(const QRect &r) const
+    { QRect rr(r); rr.translate(data.wrect.topLeft()); return rr; }
+#endif
 
+    // Variables.
+    // Regular pointers (keep them together to avoid gaps on 64 bit architectures).
     QWExtra *extra;
     QWidget *focus_next;
     QWidget *focus_prev;
     QWidget *focus_child;
-#ifndef QT_NO_ACTION
-    QList<QAction*> actions;
-#endif
     QLayout *layout;
+    QRegion *needsFlush;
+    QPaintDevice *redirectDev;
     QWidgetItemV2 *widgetItem;
-#if !defined(QT_NO_IM)
-    QPointer<QInputContext> ic;
-#endif
+    QPaintEngine *extraPaintEngine;
+    mutable const QMetaObject *polished;
     // All widgets are initially added into the uncreatedWidgets set. Once
     // they receive a window id they are removed and added to the mapper
     static QWidgetMapper *mapper;
     static QWidgetSet *uncreatedWidgets;
+#if !defined(QT_NO_IM)
+    QPointer<QInputContext> ic;
+#endif
+#ifdef QT_KEYPAD_NAVIGATION
+    static QPointer<QWidget> editingWidget;
+#endif
 
-    short leftmargin, topmargin, rightmargin, bottommargin;
-
-    signed char leftLayoutItemMargin;
-    signed char topLayoutItemMargin;
-    signed char rightLayoutItemMargin;
-    signed char bottomLayoutItemMargin;
-
-    // ### TODO: reorganize private/extra/topextra to save memory
-    QPointer<QWidget> compositeChildGrab;
+    // Implicit pointers (shared_null/shared_empty).
+    QRegion opaqueChildren;
+    QRegion dirty;
 #ifndef QT_NO_TOOLTIP
     QString toolTip;
 #endif
@@ -519,14 +489,37 @@ public:
 #ifndef QT_NO_WHATSTHIS
     QString whatsThis;
 #endif
-    QString accessibleName, accessibleDescription;
+#ifndef QT_NO_ACCESSIBILITY
+    QString accessibleName;
+    QString accessibleDescription;
+#endif
+
+    // Other variables.
+    uint inheritedFontResolveMask;
+    uint inheritedPaletteResolveMask;
+    short leftmargin;
+    short topmargin;
+    short rightmargin;
+    short bottommargin;
+    signed char leftLayoutItemMargin;
+    signed char topLayoutItemMargin;
+    signed char rightLayoutItemMargin;
+    signed char bottomLayoutItemMargin;
+    static int instanceCounter; // Current number of widget instances
+    static int maxInstances; // Maximum number of widget instances
+    Qt::HANDLE hd;
+    QWidgetData data;
+    QSizePolicy size_policy;
+    QLocale locale;
+    QPoint redirectOffset;
+#ifndef QT_NO_ACTION
+    QList<QAction*> actions;
+#endif
 
+    // Bit fields.
+    uint high_attributes[3]; // the low ones are in QWidget::widget_attributes
     QPalette::ColorRole fg_role : 8;
     QPalette::ColorRole bg_role : 8;
-    uint high_attributes[3]; // the low ones are in QWidget::widget_attributes
-    Qt::HANDLE hd;
-    QRegion dirty;
-    QRegion *needsFlush;
     uint dirtyOpaqueChildren : 1;
     uint isOpaque : 1;
     uint inDirtyList : 1;
@@ -534,35 +527,33 @@ public:
     uint isMoved : 1;
     uint usesDoubleBufferedGLContext : 1;
 
-#ifdef Q_WS_WIN
-    uint noPaintOnScreen : 1; // see qwidget_win.cpp ::paintEngine()
-#endif
-
-    uint inheritedFontResolveMask;
-    uint inheritedPaletteResolveMask;
-#if defined(Q_WS_X11)
+    // *************************** Platform specific ************************************
+#if defined(Q_WS_X11) // <----------------------------------------------------------- X11
     QX11Info xinfo;
     Qt::HANDLE picture;
+    static QWidget *mouseGrabber;
+    static QWidget *keyboardGrabber;
+
+    void setWindowRole();
+    void sendStartupMessage(const char *message) const;
+    void setNetWmWindowTypes();
+    void x11UpdateIsOpaque();
+    bool isBackgroundInherited() const;
+#elif defined(Q_WS_WIN) // <--------------------------------------------------------- WIN
+    uint noPaintOnScreen : 1; // see qwidget_win.cpp ::paintEngine()
+
+    bool shouldShowMaximizeButton();
+    void winUpdateIsOpaque();
+    void reparentChildren();
+#ifndef QT_NO_DRAGANDDROP
+    QOleDropTarget *registerOleDnd(QWidget *widget);
+    void unregisterOleDnd(QWidget *widget, QOleDropTarget *target);
 #endif
-#if defined(Q_WS_MAC)
-    enum PaintChildrenOPs {
-        PC_None = 0x00,
-        PC_Now = 0x01,
-        PC_NoPaint = 0x04,
-        PC_Later = 0x10
-    };
-    EventHandlerRef window_event;
-    bool qt_mac_dnd_event(uint, DragRef);
-    void toggleDrawers(bool);
-    //mac event functions
-    static bool qt_create_root_win();
-    static void qt_clean_root_win();
-    static bool qt_recreate_root_win();
-    static bool qt_mac_update_sizer(QWidget *, int up = 0);
-    static OSStatus qt_window_event(EventHandlerCallRef er, EventRef event, void *);
-    static OSStatus qt_widget_event(EventHandlerCallRef er, EventRef event, void *);
-    static bool qt_widget_rgn(QWidget *, short, RgnHandle, bool);
-    static bool qt_widget_shape(QWidget *, short, HIMutableShapeRef, bool);
+    void grabMouseWhileInWindow();
+#elif defined(Q_WS_MAC) // <--------------------------------------------------------- MAC
+    // This is new stuff
+    uint needWindowChange : 1;
+    uint isGLWidget : 1;
 
     // Each wiget keeps a list of all its child and grandchild OpenGL widgets.
     // This list is used to update the gl context whenever a parent and a granparent
@@ -575,95 +566,70 @@ public:
         QWidget * widget;
         QWidget * lastUpdateWidget;
     };
-    QList<GlWidgetInfo> glWidgets;
 
     // dirtyOnWidget contains the areas in the widget that needs to be repained,
     // in the same way as dirtyOnScreen does for the window. Areas are added in
     // dirtyWidget_sys and cleared in the paint event. In scroll_sys we then use
     // this information repaint invalid areas when widgets are scrolled.
     QRegion dirtyOnWidget;
+    EventHandlerRef window_event;
+    QList<GlWidgetInfo> glWidgets;
 
     //these are here just for code compat (HIViews)
     Qt::HANDLE qd_hd;
 
-    // This is new stuff
-    uint needWindowChange : 1;
-    uint isGLWidget : 1;
-#endif
-
-#if defined(Q_WS_X11) || defined (Q_WS_WIN) || defined(Q_WS_MAC)
-#ifdef Q_WS_MAC
-    void setWSGeometry(bool dontShow=false, const QRect &oldRect = QRect());
+    void macUpdateSizeAttribute();
+    void macUpdateHideOnSuspend();
+    void macUpdateOpaqueSizeGrip();
+    void macUpdateIgnoreMouseEvents();
+    void macUpdateMetalAttribute();
+    void macUpdateIsOpaque();
+    void setEnabled_helper_sys(bool enable);
+    bool isRealWindow() const;
+    void adjustWithinMaxAndMinSize(int &w, int &h);
+    void applyMaxAndMinSizeOnWindow();
+    void update_sys(const QRect &rect);
+    void update_sys(const QRegion &rgn);
+    void setGeometry_sys_helper(int, int, int, int, bool);
+    void setWindowModified_sys(bool b);
+    void updateMaximizeButton_sys();
+    void setWindowFilePath_sys(const QString &filePath);
+    void createWindow_sys();
+    void recreateMacWindow();
+#ifndef QT_MAC_USE_COCOA
+    void initWindowPtr();
+    void finishCreateWindow_sys_Carbon(OSWindowRef windowRef);
 #else
-    void setWSGeometry(bool dontShow=false);
+    void finishCreateWindow_sys_Cocoa(void * /*NSWindow * */ windowRef);
+    void syncCocoaMask();
+    void finishCocoaMaskSetup();
 #endif
+    void determineWindowClass();
+    void transferChildren();
+    bool qt_mac_dnd_event(uint, DragRef);
+    void toggleDrawers(bool);
+    //mac event functions
+    static bool qt_create_root_win();
+    static void qt_clean_root_win();
+    static bool qt_mac_update_sizer(QWidget *, int up = 0);
+    static OSStatus qt_window_event(EventHandlerCallRef er, EventRef event, void *);
+    static OSStatus qt_widget_event(EventHandlerCallRef er, EventRef event, void *);
+    static bool qt_widget_rgn(QWidget *, short, RgnHandle, bool);
+#elif defined(Q_WS_QWS) // <--------------------------------------------------------- QWS
+    void setMaxWindowState_helper();
+    void setFullScreenSize_helper();
+    void moveSurface(QWindowSurface *surface, const QPoint &offset);
+    QRegion localRequestedRegion() const;
+    QRegion localAllocatedRegion() const;
 
-    inline QPoint mapToWS(const QPoint &p) const
-    { return p - data.wrect.topLeft(); }
-
-    inline QPoint mapFromWS(const QPoint &p) const
-    { return p + data.wrect.topLeft(); }
-
-    inline QRect mapToWS(const QRect &r) const
-    { QRect rr(r); rr.translate(-data.wrect.topLeft()); return rr; }
-
-    inline QRect mapFromWS(const QRect &r) const
-    { QRect rr(r); rr.translate(data.wrect.topLeft()); return rr; }
+    friend class QWSManager;
+    friend class QWSManagerPrivate;
+    friend class QDecoration;
+#ifndef QT_NO_CURSOR
+    void updateCursor() const;
 #endif
-
-    QPaintEngine *extraPaintEngine;
-
-    mutable const QMetaObject *polished;
-
-    void setModal_sys();
-    QSizePolicy size_policy;
-    QLocale locale;
-
-#ifdef Q_WS_X11
-    static QWidget *mouseGrabber;
-    static QWidget *keyboardGrabber;
+    QScreen* getScreen() const;
 #endif
-    QPaintDevice *redirectDev;
-    QPoint redirectOffset;
-
-    inline void setRedirected(QPaintDevice *replacement, const QPoint &offset)
-    {
-        Q_ASSERT(q_func()->testAttribute(Qt::WA_WState_InPaintEvent));
-        redirectDev = replacement;
-        redirectOffset = offset;
-    }
-
-    inline QPaintDevice *redirected(QPoint *offset) const
-    {
-        if (offset)
-            *offset = redirectDev ? redirectOffset : QPoint();
-        return redirectDev;
-    }
-
-    inline void restoreRedirected()
-    { redirectDev = 0; }
-
-    inline void enforceNativeChildren()
-    {
-        if (!extra)
-            createExtra();
-
-        if (extra->nativeChildrenForced)
-            return;
-        extra->nativeChildrenForced = 1;
-
-        for (int i = 0; i < children.size(); ++i) {
-            if (QWidget *child = qobject_cast<QWidget *>(children.at(i)))
-                child->setAttribute(Qt::WA_NativeWindow);
-        }
-    }
-
-    inline bool nativeChildrenForced() const
-    {
-        return extra ? extra->nativeChildrenForced : false;
-    }
-
-    QSize adjustedSize() const;
 };
 
 inline QWExtra *QWidgetPrivate::extraData() const
diff --git a/src/gui/kernel/qwidget_qws.cpp b/src/gui/kernel/qwidget_qws.cpp
index 1445f57..94bdb85 100644
--- a/src/gui/kernel/qwidget_qws.cpp
+++ b/src/gui/kernel/qwidget_qws.cpp
@@ -565,20 +565,6 @@ void QWidget::activateWindow()
     }
 }
 
-/*
-  Should we require that  q is a toplevel window ???
-
-  Used by QWSManager
- */
-void QWidgetPrivate::blitToScreen(const QRegion &globalrgn)
-{
-    Q_Q(QWidget);
-    QWidget *win = q->window();
-    QBrush bgBrush = win->palette().brush(win->backgroundRole());
-    bool opaque = bgBrush.style() == Qt::NoBrush || bgBrush.isOpaque();
-    QWidget::qwsDisplay()->repaintRegion(win->data->winid, win->windowFlags(), opaque, globalrgn);
-}
-
 void QWidgetPrivate::show_sys()
 {
     Q_Q(QWidget);
@@ -1037,6 +1023,9 @@ void QWidgetPrivate::deleteSysExtra()
 
 void QWidgetPrivate::createTLSysExtra()
 {
+#ifndef QT_NO_QWS_MANAGER
+    extra->topextra->qwsManager = 0;
+#endif
 }
 
 void QWidgetPrivate::deleteTLSysExtra()
diff --git a/src/gui/kernel/qwidget_win.cpp b/src/gui/kernel/qwidget_win.cpp
index cfdabaf..0f341fd 100644
--- a/src/gui/kernel/qwidget_win.cpp
+++ b/src/gui/kernel/qwidget_win.cpp
@@ -1025,13 +1025,13 @@ void QWidget::setWindowState(Qt::WindowStates newstate)
             if (newstate & Qt::WindowFullScreen) {
                 if (d->topData()->normalGeometry.width() < 0 && !(oldstate & Qt::WindowMaximized))
                     d->topData()->normalGeometry = geometry();
-                d->topData()->savedFlags = GetWindowLongA(internalWinId(), GWL_STYLE);
+                d->topData()->savedFlags = Qt::WindowFlags(GetWindowLongA(internalWinId(), GWL_STYLE));
 #ifndef Q_FLATTEN_EXPOSE
                 UINT style = WS_CLIPCHILDREN | WS_CLIPSIBLINGS | WS_POPUP;
 #else
                 UINT style = WS_POPUP;
 #endif
-		if (d->topData()->savedFlags & WS_SYSMENU)
+		if (ulong(d->topData()->savedFlags) & WS_SYSMENU)
 		    style |= WS_SYSMENU;
                 if (isVisible())
                     style |= WS_VISIBLE;
@@ -1234,7 +1234,7 @@ void QWidgetPrivate::stackUnder_sys(QWidget* w)
   (In all comments below: s/X/Windows/g)
  */
 
-void QWidgetPrivate::setWSGeometry(bool dontShow)
+void QWidgetPrivate::setWSGeometry(bool dontShow, const QRect &)
 {
     Q_Q(QWidget);
     Q_ASSERT(q->testAttribute(Qt::WA_WState_Created));
@@ -1704,7 +1704,6 @@ int QWidget::metric(PaintDeviceMetric m) const
     return val;
 }
 
-#ifndef Q_WS_WINCE
 void QWidgetPrivate::createSysExtra()
 {
 #ifndef QT_NO_DRAGANDDROP
@@ -1712,6 +1711,7 @@ void QWidgetPrivate::createSysExtra()
 #endif
 }
 
+#ifndef Q_WS_WINCE
 void QWidgetPrivate::deleteSysExtra()
 {
 }
@@ -1719,8 +1719,9 @@ void QWidgetPrivate::deleteSysExtra()
 
 void QWidgetPrivate::createTLSysExtra()
 {
-    extra->topextra->winIconSmall = 0;
+    extra->topextra->savedFlags = 0;
     extra->topextra->winIconBig = 0;
+    extra->topextra->winIconSmall = 0;
 }
 
 void QWidgetPrivate::deleteTLSysExtra()
diff --git a/src/gui/kernel/qwidget_wince.cpp b/src/gui/kernel/qwidget_wince.cpp
index cca928e..435fd31 100644
--- a/src/gui/kernel/qwidget_wince.cpp
+++ b/src/gui/kernel/qwidget_wince.cpp
@@ -535,7 +535,7 @@ void QWidget::setWindowState(Qt::WindowStates newstate)
             if (newstate & Qt::WindowFullScreen) {
                 if (d->topData()->normalGeometry.width() < 0 && !(oldstate & Qt::WindowMaximized))
                     d->topData()->normalGeometry = geometry();
-                d->topData()->savedFlags = GetWindowLongA(internalWinId(), GWL_STYLE);
+                d->topData()->savedFlags = (Qt::WindowFlags) GetWindowLongA(internalWinId(), GWL_STYLE);
                 UINT style = WS_CLIPCHILDREN | WS_CLIPSIBLINGS | WS_POPUP;
                 if (isVisible())
                     style |= WS_VISIBLE;
@@ -598,13 +598,6 @@ void QWidget::setWindowState(Qt::WindowStates newstate)
     QApplication::sendEvent(this, &e);
 }
 
-
-void QWidgetPrivate::createSysExtra() {
-#ifndef QT_NO_DRAGANDDROP
-    extra->dropTarget = 0;
-#endif
-}
-
 void QWidgetPrivate::deleteSysExtra()
 {
     Q_Q(QWidget);
diff --git a/src/gui/kernel/qwidget_x11.cpp b/src/gui/kernel/qwidget_x11.cpp
index 6202b35..b35740a 100644
--- a/src/gui/kernel/qwidget_x11.cpp
+++ b/src/gui/kernel/qwidget_x11.cpp
@@ -906,6 +906,44 @@ void QWidgetPrivate::x11UpdateIsOpaque()
 #endif
 }
 
+/*
+  Returns true if the background is inherited; otherwise returns
+  false.
+
+  Mainly used in the paintOnScreen case.
+*/
+bool QWidgetPrivate::isBackgroundInherited() const
+{
+    Q_Q(const QWidget);
+
+    // windows do not inherit their background
+    if (q->isWindow() || q->windowType() == Qt::SubWindow)
+        return false;
+
+    if (q->testAttribute(Qt::WA_NoSystemBackground) || q->testAttribute(Qt::WA_OpaquePaintEvent))
+        return false;
+
+    const QPalette &pal = q->palette();
+    QPalette::ColorRole bg = q->backgroundRole();
+    QBrush brush = pal.brush(bg);
+
+    // non opaque brushes leaves us no choice, we must inherit
+    if (!q->autoFillBackground() || !brush.isOpaque())
+        return true;
+
+    if (brush.style() == Qt::SolidPattern) {
+        // the background is just a solid color. If there is no
+        // propagated contents, then we claim as performance
+        // optimization that it was not inheritet. This is the normal
+        // case in standard Windows or Motif style.
+        const QWidget *w = q->parentWidget();
+        if (!w->d_func()->isBackgroundInherited())
+            return false;
+    }
+
+    return true;
+}
+
 void QWidget::destroy(bool destroyWindow, bool destroySubWindows)
 {
     Q_D(QWidget);
@@ -2152,7 +2190,7 @@ static void do_size_hints(QWidget* widget, QWExtra *x)
   parentWRect is the geometry of the parent's X rect, measured in
   parent's coord sys
  */
-void QWidgetPrivate::setWSGeometry(bool dontShow)
+void QWidgetPrivate::setWSGeometry(bool dontShow, const QRect &)
 {
     Q_Q(QWidget);
     Q_ASSERT(q->testAttribute(Qt::WA_WState_Created));
@@ -2610,8 +2648,8 @@ int QWidget::metric(PaintDeviceMetric m) const
 
 void QWidgetPrivate::createSysExtra()
 {
-    extra->xDndProxy = 0;
     extra->compress_events = true;
+    extra->xDndProxy = 0;
 }
 
 void QWidgetPrivate::deleteSysExtra()
@@ -2620,8 +2658,11 @@ void QWidgetPrivate::deleteSysExtra()
 
 void QWidgetPrivate::createTLSysExtra()
 {
+    extra->topextra->spont_unmapped = 0;
+    extra->topextra->dnd = 0;
     extra->topextra->validWMState = 0;
     extra->topextra->waitingForMapNotify = 0;
+    extra->topextra->parentWinId = 0;
     extra->topextra->userTimeWindow = 0;
 }
 
diff --git a/src/gui/painting/qcolor.cpp b/src/gui/painting/qcolor.cpp
index 24d167e..534a425 100644
--- a/src/gui/painting/qcolor.cpp
+++ b/src/gui/painting/qcolor.cpp
@@ -1369,7 +1369,7 @@ QColor QColor::toRgb() const
 */
 QColor QColor::toHsv() const
 {
-    if (!isValid())
+    if (!isValid() || cspec == Hsv)
         return *this;
 
     if (cspec != Rgb)
@@ -1421,7 +1421,7 @@ QColor QColor::toHsv() const
 */
 QColor QColor::toCmyk() const
 {
-    if (!isValid())
+    if (!isValid() || cspec == Cmyk)
         return *this;
     if (cspec != Rgb)
         return toRgb().toCmyk();
diff --git a/src/gui/painting/qemulationpaintengine.cpp b/src/gui/painting/qemulationpaintengine.cpp
index 3397c45..175f1ab 100644
--- a/src/gui/painting/qemulationpaintengine.cpp
+++ b/src/gui/painting/qemulationpaintengine.cpp
@@ -123,14 +123,30 @@ void QEmulationPaintEngine::stroke(const QVectorPath &path, const QPen &pen)
         real_engine->stroke(path, bgPen);
     }
 
-
     QBrush brush = pen.brush();
+    QPen copy = pen;
     Qt::BrushStyle style = qbrush_style(brush);
     if (style >= Qt::LinearGradientPattern && style <= Qt::ConicalGradientPattern) {
         const QGradient *g = brush.gradient();
+
         if (g->coordinateMode() > QGradient::LogicalMode) {
-            QPaintEngineEx::stroke(path, pen);
-            return;
+            if (g->coordinateMode() == QGradient::StretchToDeviceMode) {
+                QTransform mat = brush.transform();
+                mat.scale(real_engine->painter()->device()->width(), real_engine->painter()->device()->height());
+                brush.setTransform(mat);
+                copy.setBrush(brush);
+                real_engine->stroke(path, copy);
+                return;
+            } else if (g->coordinateMode() == QGradient::ObjectBoundingMode) {
+                QTransform mat = brush.transform();
+                QRealRect r = path.controlPointRect();
+                mat.translate(r.x1, r.y1);
+                mat.scale(r.x2 - r.x1, r.y2 - r.y1);
+                brush.setTransform(mat);
+                copy.setBrush(brush);
+                real_engine->stroke(path, copy);
+                return;
+            }
         }
     }
 
diff --git a/src/gui/painting/qtextureglyphcache.cpp b/src/gui/painting/qtextureglyphcache.cpp
index 1ea40ba..3fd1ffb 100644
--- a/src/gui/painting/qtextureglyphcache.cpp
+++ b/src/gui/painting/qtextureglyphcache.cpp
@@ -88,11 +88,12 @@ void QTextureGlyphCache::populate(const QTextItemInt &ti,
                ti.ascent.toReal(),
                ti.descent.toReal());
 #endif
-        int glyph_width = metrics.width.ceil().toInt() + margin * 2;
-        int glyph_height = metrics.height.ceil().toInt() + margin * 2;
+        int glyph_width = metrics.width.ceil().toInt();
+        int glyph_height = metrics.height.ceil().toInt();
         if (glyph_height == 0 || glyph_width == 0)
             continue;
-
+        glyph_width += margin * 2 + 2;
+        glyph_height += margin * 2 + 2;
         // align to 8-bit boundary
         if (m_type == QFontEngineGlyphCache::Raster_Mono)
             glyph_width = (glyph_width+7)&~7;
@@ -188,11 +189,7 @@ void QImageTextureGlyphCache::createTextureData(int width, int height)
 
 int QImageTextureGlyphCache::glyphMargin() const
 {
-#ifdef Q_WS_MAC
     return 2;
-#else
-    return m_type == QFontEngineGlyphCache::Raster_RGBMask ? 2 : 0;
-#endif
 }
 
 void QImageTextureGlyphCache::fillTexture(const Coord &c, glyph_t g)
diff --git a/src/gui/styles/qcommonstyle.cpp b/src/gui/styles/qcommonstyle.cpp
index c0899f8..6972803 100644
--- a/src/gui/styles/qcommonstyle.cpp
+++ b/src/gui/styles/qcommonstyle.cpp
@@ -1664,6 +1664,7 @@ void QCommonStyle::drawControl(ControlElement element, const QStyleOption *opt,
                 if (!styleHint(SH_UnderlineShortcut, opt, widget))
                     alignment |= Qt::TextHideMnemonic;
                 rect.translate(shiftX, shiftY);
+                p->setFont(toolbutton->font);
                 drawItemText(p, rect, alignment, toolbutton->palette,
                              opt->state & State_Enabled, toolbutton->text,
                              QPalette::ButtonText);
diff --git a/src/gui/styles/qmotifstyle.cpp b/src/gui/styles/qmotifstyle.cpp
index 7d4fab8..be0e3eb 100644
--- a/src/gui/styles/qmotifstyle.cpp
+++ b/src/gui/styles/qmotifstyle.cpp
@@ -2026,10 +2026,6 @@ QMotifStyle::sizeFromContents(ContentsType ct, const QStyleOption *opt,
     QSize sz(contentsSize);
 
     switch(ct) {
-    case CT_Splitter:
-        sz = QSize(10, 10);
-        break;
-
     case CT_RadioButton:
     case CT_CheckBox:
         sz = QCommonStyle::sizeFromContents(ct, opt, contentsSize, widget);
diff --git a/src/gui/styles/qstyle.cpp b/src/gui/styles/qstyle.cpp
index 7ccac85..de4b5a3 100644
--- a/src/gui/styles/qstyle.cpp
+++ b/src/gui/styles/qstyle.cpp
@@ -1333,7 +1333,7 @@ void QStyle::drawItemPixmap(QPainter *painter, const QRect &rect, int alignment,
     \value PM_LayoutVerticalSpacing  Default \l{QLayout::spacing}{vertical spacing} for a QLayout.
 
     \value PM_MaximumDragDistance The maximum allowed distance between
-    the mouse and a slider when dragging. Exceeding the specified
+    the mouse and a scrollbar when dragging. Exceeding the specified
     distance will cause the slider to jump back to the original
     position; a value of -1 disables this behavior.
 
diff --git a/src/gui/styles/qstylesheetstyle.cpp b/src/gui/styles/qstylesheetstyle.cpp
index dcc11b8..cd44bfd 100644
--- a/src/gui/styles/qstylesheetstyle.cpp
+++ b/src/gui/styles/qstylesheetstyle.cpp
@@ -3030,6 +3030,7 @@ void QStyleSheetStyle::drawComplexControl(ComplexControl cc, const QStyleOptionC
         if (const QStyleOptionToolButton *tool = qstyleoption_cast<const QStyleOptionToolButton *>(opt)) {
             QStyleOptionToolButton toolOpt(*tool);
             rule.configurePalette(&toolOpt.palette, QPalette::ButtonText, QPalette::Button);
+            toolOpt.font = rule.font.resolve(toolOpt.font);
             toolOpt.rect = rule.borderRect(opt->rect);
             bool customArrow = (tool->features & (QStyleOptionToolButton::HasMenu | QStyleOptionToolButton::MenuButtonPopup));
             bool customDropDown = tool->features & QStyleOptionToolButton::MenuButtonPopup;
diff --git a/src/gui/styles/qwindowsxpstyle.cpp b/src/gui/styles/qwindowsxpstyle.cpp
index 639eff0..3dac9f5 100644
--- a/src/gui/styles/qwindowsxpstyle.cpp
+++ b/src/gui/styles/qwindowsxpstyle.cpp
@@ -1792,7 +1792,12 @@ case PE_Frame:
         return;
 
     case PE_IndicatorToolBarSeparator:
-
+        if (option->rect.height() < 3) {
+            // XP style requires a few pixels for the separator
+            // to be visible.
+            QWindowsStyle::drawPrimitive(pe, option, p, widget);
+            return;
+        }
         name = QLatin1String("TOOLBAR");
         partId = TP_SEPARATOR;
 
diff --git a/src/gui/text/qfontengine_ft.cpp b/src/gui/text/qfontengine_ft.cpp
index 7a236fd..6f5ee1f 100644
--- a/src/gui/text/qfontengine_ft.cpp
+++ b/src/gui/text/qfontengine_ft.cpp
@@ -613,7 +613,7 @@ QFontEngineFT::QFontEngineFT(const QFontDef &fd)
     subpixelType = Subpixel_None;
     lcdFilterType = 0;
 #if defined(FT_LCD_FILTER_H)
-    lcdFilterType = (int) FT_LCD_FILTER_DEFAULT;
+    lcdFilterType = (int)((quintptr) FT_LCD_FILTER_DEFAULT);
 #endif
     defaultFormat = Format_None;
     canUploadGlyphsToServer = false;
diff --git a/src/gui/text/qfontengine_win.cpp b/src/gui/text/qfontengine_win.cpp
index 6551e87..feea1f2 100644
--- a/src/gui/text/qfontengine_win.cpp
+++ b/src/gui/text/qfontengine_win.cpp
@@ -1406,8 +1406,8 @@ QNativeImage *QFontEngineWin::drawGDIGlyph(HFONT font, glyph_t glyph, int margin
 #endif
 #endif
 
-    QNativeImage *ni = new QNativeImage(iw + 2 * margin,
-                                        ih + 2 * margin,
+    QNativeImage *ni = new QNativeImage(iw + 2 * margin + 2,
+                                        ih + 2 * margin + 2,
                                         QNativeImage::systemFormat(), true);
     ni->image.fill(0xffffffff);
 
@@ -1449,7 +1449,7 @@ QImage QFontEngineWin::alphaMapForGlyph(glyph_t glyph, const QTransform &xform)
         font = CreateFontIndirectW(&lf);
     }
 
-    QNativeImage *mask = drawGDIGlyph(font, glyph, 0, xform);
+    QNativeImage *mask = drawGDIGlyph(font, glyph, 2, xform);
     if (mask == 0)
         return QImage();
 
diff --git a/src/gui/widgets/qabstractscrollarea.cpp b/src/gui/widgets/qabstractscrollarea.cpp
index 9886969..0d8b4de 100644
--- a/src/gui/widgets/qabstractscrollarea.cpp
+++ b/src/gui/widgets/qabstractscrollarea.cpp
@@ -873,21 +873,22 @@ bool QAbstractScrollArea::event(QEvent *e)
     case QEvent::Resize:
             d->layoutChildren();
             break;
-    case QEvent::Paint:
+    case QEvent::Paint: {
+        QStyleOption option;
+        option.initFrom(this);
         if (d->cornerPaintingRect.isValid()) {
-            QStyleOption option;
             option.rect = d->cornerPaintingRect;
             QPainter p(this);
             style()->drawPrimitive(QStyle::PE_PanelScrollAreaCorner, &option, &p, this);
         }
 #ifdef Q_WS_MAC
         if (d->reverseCornerPaintingRect.isValid()) {
-            QStyleOption option;
             option.rect = d->reverseCornerPaintingRect;
             QPainter p(this);
             style()->drawPrimitive(QStyle::PE_PanelScrollAreaCorner, &option, &p, this);
         }
 #endif
+        }
         QFrame::paintEvent((QPaintEvent*)e);
         break;
 #ifndef QT_NO_CONTEXTMENU
diff --git a/src/gui/widgets/qabstractspinbox.cpp b/src/gui/widgets/qabstractspinbox.cpp
index 347f89a..d640c70 100644
--- a/src/gui/widgets/qabstractspinbox.cpp
+++ b/src/gui/widgets/qabstractspinbox.cpp
@@ -193,6 +193,7 @@ void QAbstractSpinBox::setButtonSymbols(ButtonSymbols buttonSymbols)
     Q_D(QAbstractSpinBox);
     if (d->buttonSymbols != buttonSymbols) {
         d->buttonSymbols = buttonSymbols;
+        d->updateEditFieldGeometry();
         update();
     }
 }
diff --git a/src/gui/widgets/qmenu_wince.cpp b/src/gui/widgets/qmenu_wince.cpp
index 0befa6d..2ce89f9 100644
--- a/src/gui/widgets/qmenu_wince.cpp
+++ b/src/gui/widgets/qmenu_wince.cpp
@@ -214,7 +214,7 @@ static HWND qt_wce_create_menubar(HWND parentHandle, HINSTANCE resourceHandle, i
         mbi.nToolBarId = toolbarID;
 
         if (ptrCreateMenuBar(&mbi)) {
-#ifdef Q_WS_WINCE_WM
+#ifdef Q_OS_WINCE_WM
             // Tell the menu bar that we want to override hot key behaviour.
             LPARAM lparam = MAKELPARAM(SHMBOF_NODEFAULT | SHMBOF_NOTIFY,
                                        SHMBOF_NODEFAULT | SHMBOF_NOTIFY);
diff --git a/src/gui/widgets/qslider.cpp b/src/gui/widgets/qslider.cpp
index 32b9021..5b9c8a4 100644
--- a/src/gui/widgets/qslider.cpp
+++ b/src/gui/widgets/qslider.cpp
@@ -62,7 +62,6 @@ public:
     int tickInterval;
     QSlider::TickPosition tickPosition;
     int clickOffset;
-    int snapBackPosition;
     void init();
 	void resetLayoutItemMargins();
     int pixelPosToRangeValue(int pos) const;
@@ -493,7 +492,6 @@ void QSlider::mousePressEvent(QMouseEvent *ev)
         setRepeatAction(SliderNoAction);
         QRect sr = style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderHandle, this);
         d->clickOffset = d->pick(ev->pos() - sr.topLeft());
-        d->snapBackPosition = d->position;
         update(sr);
         setSliderDown(true);
     }
@@ -513,14 +511,6 @@ void QSlider::mouseMoveEvent(QMouseEvent *ev)
     int newPosition = d->pixelPosToRangeValue(d->pick(ev->pos()) - d->clickOffset);
     QStyleOptionSlider opt;
     initStyleOption(&opt);
-    int m = style()->pixelMetric(QStyle::PM_MaximumDragDistance, &opt, this);
-    if (m >= 0) {
-        QRect r = rect();
-        r.adjust(-m, -m, m, m);
-        if (!r.contains(ev->pos())) {
-            newPosition = d->snapBackPosition;
-    }
-    }
     setSliderPosition(newPosition);
 }
 
diff --git a/src/network/access/qhttpnetworkconnection.cpp b/src/network/access/qhttpnetworkconnection.cpp
index 5940fba..d4bf008 100644
--- a/src/network/access/qhttpnetworkconnection.cpp
+++ b/src/network/access/qhttpnetworkconnection.cpp
@@ -40,6 +40,7 @@
 ****************************************************************************/
 
 #include "qhttpnetworkconnection_p.h"
+#include "private/qnoncontiguousbytedevice_p.h"
 #include <private/qnetworkrequest_p.h>
 #include <private/qobject_p.h>
 #include <private/qauthenticator_p.h>
@@ -71,6 +72,7 @@ QHttpNetworkConnectionPrivate::QHttpNetworkConnectionPrivate(const QString &host
 #ifndef QT_NO_NETWORKPROXY
   , networkProxy(QNetworkProxy::NoProxy)
 #endif
+
 {
 }
 
@@ -205,12 +207,19 @@ void QHttpNetworkConnectionPrivate::prepareRequest(HttpMessagePair &messagePair)
     // add missing fields for the request
     QByteArray value;
     // check if Content-Length is provided
-    QIODevice *data = request.data();
-    if (data && request.contentLength() == -1) {
-        if (!data->isSequential())
-            request.setContentLength(data->size());
-        else
-            bufferData(messagePair); // ### or do chunked upload
+    QNonContiguousByteDevice* uploadByteDevice = request.uploadByteDevice();
+    if (uploadByteDevice) {
+        if (request.contentLength() != -1 && uploadByteDevice->size() != -1) {
+            // both values known, take the smaller one.
+            request.setContentLength(qMin(uploadByteDevice->size(), request.contentLength()));
+        } else if (request.contentLength() == -1 && uploadByteDevice->size() != -1) {
+            // content length not supplied by user, but the upload device knows it
+            request.setContentLength(uploadByteDevice->size());
+        } else if (request.contentLength() != -1 && uploadByteDevice->size() == -1) {
+            // everything OK, the user supplied us the contentLength
+        } else if (request.contentLength() == -1 && uploadByteDevice->size() == -1) {
+            qFatal("QHttpNetworkConnectionPrivate: Neither content-length nor upload device size were given");
+        }
     }
     // set the Connection/Proxy-Connection: Keep-Alive headers
 #ifndef QT_NO_NETWORKPROXY
@@ -361,18 +370,12 @@ bool QHttpNetworkConnectionPrivate::sendRequest(QAbstractSocket *socket)
             false);
 #endif
         socket->write(header);
-        QIODevice *data = channels[i].request.d->data;
-        QHttpNetworkReply *reply = channels[i].reply;
-        if (reply && reply->d_func()->requestDataBuffer.size())
-            data = &channels[i].reply->d_func()->requestDataBuffer;
-        if (data && (data->isOpen() || data->open(QIODevice::ReadOnly))) {
-            if (data->isSequential()) {
-                channels[i].bytesTotal = -1;
-                QObject::connect(data, SIGNAL(readyRead()), q, SLOT(_q_dataReadyReadNoBuffer()));
-                QObject::connect(data, SIGNAL(readChannelFinished()), q, SLOT(_q_dataReadyReadNoBuffer()));
-            } else {
-                channels[i].bytesTotal = data->size();
-            }
+        QNonContiguousByteDevice* uploadByteDevice = channels[i].request.uploadByteDevice();
+        if (uploadByteDevice) {
+            // connect the signals so this function gets called again
+            QObject::connect(uploadByteDevice, SIGNAL(readyRead()), q, SLOT(_q_uploadDataReadyRead()));
+
+            channels[i].bytesTotal = channels[i].request.contentLength();
         } else {
             channels[i].state = WaitingState;
             break;
@@ -380,30 +383,81 @@ bool QHttpNetworkConnectionPrivate::sendRequest(QAbstractSocket *socket)
         // write the initial chunk together with the headers
         // fall through
     }
-    case WritingState: { // write the data
-        QIODevice *data = channels[i].request.d->data;
-        if (channels[i].reply->d_func()->requestDataBuffer.size())
-            data = &channels[i].reply->d_func()->requestDataBuffer;
-        if (!data || channels[i].bytesTotal == channels[i].written) {
+    case WritingState:
+    {
+        // write the data
+        QNonContiguousByteDevice* uploadByteDevice = channels[i].request.uploadByteDevice();
+        if (!uploadByteDevice || channels[i].bytesTotal == channels[i].written) {
+            if (uploadByteDevice)
+                emit channels[i].reply->dataSendProgress(channels[i].written, channels[i].bytesTotal);
             channels[i].state = WaitingState; // now wait for response
+            sendRequest(socket);
             break;
         }
 
-        QByteArray chunk;
-        chunk.resize(ChunkSize);
-        qint64 readSize = data->read(chunk.data(), ChunkSize);
-        if (readSize == -1) {
-            // source has reached EOF
-            channels[i].state = WaitingState; // now wait for response
-        } else if (readSize > 0) {
-            // source gave us something useful
-            channels[i].written += socket->write(chunk.data(), readSize);
-            if (channels[i].reply)
-                emit channels[i].reply->dataSendProgress(channels[i].written, channels[i].bytesTotal);
+        // only feed the QTcpSocket buffer when there is less than 32 kB in it
+        const qint64 socketBufferFill = 32*1024;
+        const qint64 socketWriteMaxSize = 16*1024;
+
+
+#ifndef QT_NO_OPENSSL
+        QSslSocket *sslSocket = qobject_cast<QSslSocket*>(socket);
+        while ((sslSocket->encryptedBytesToWrite() + sslSocket->bytesToWrite()) <= socketBufferFill
+               && channels[i].bytesTotal != channels[i].written)
+#else
+        while (socket->bytesToWrite() <= socketBufferFill
+               && channels[i].bytesTotal != channels[i].written)
+#endif
+        {
+            // get pointer to upload data
+            qint64 currentReadSize;
+            qint64 desiredReadSize = qMin(socketWriteMaxSize, channels[i].bytesTotal - channels[i].written);
+            const char *readPointer = uploadByteDevice->readPointer(desiredReadSize, currentReadSize);
+
+            if (currentReadSize == -1) {
+                // premature eof happened
+                emitReplyError(socket, channels[i].reply, QNetworkReply::UnknownNetworkError);
+                return false;
+                break;
+            } else if (readPointer == 0 || currentReadSize == 0) {
+                // nothing to read currently, break the loop
+                break;
+            } else {
+                qint64 currentWriteSize = socket->write(readPointer, currentReadSize);
+                if (currentWriteSize == -1 || currentWriteSize != currentReadSize) {
+                    // socket broke down
+                    emitReplyError(socket, channels[i].reply, QNetworkReply::UnknownNetworkError);
+                    return false;
+                } else {
+                    channels[i].written += currentWriteSize;
+                    uploadByteDevice->advanceReadPointer(currentWriteSize);
+
+                    emit channels[i].reply->dataSendProgress(channels[i].written, channels[i].bytesTotal);
+
+                    if (channels[i].written == channels[i].bytesTotal) {
+                        // make sure this function is called once again
+                        channels[i].state = WaitingState;
+                        sendRequest(socket);
+                        break;
+                    }
+                }
+            }
         }
         break;
     }
+
     case WaitingState:
+    {
+        QNonContiguousByteDevice* uploadByteDevice = channels[i].request.uploadByteDevice();
+        if (uploadByteDevice) {
+            QObject::disconnect(uploadByteDevice, SIGNAL(readyRead()), q, SLOT(_q_uploadDataReadyRead()));
+        }
+        // ensure we try to receive a reply in all cases, even if _q_readyRead_ hat not been called
+        // this is needed if the sends an reply before we have finished sending the request. In that
+        // case receiveReply had been called before but ignored the server reply
+        receiveReply(socket, channels[i].reply);
+        break;
+    }
     case ReadingState:
     case Wait4AuthState:
         // ignore _q_bytesWritten in these states
@@ -479,6 +533,9 @@ bool QHttpNetworkConnectionPrivate::expand(QAbstractSocket *socket, QHttpNetwork
                     // make sure that the reply is valid
                     if (channels[i].reply != reply)
                         return true;
+                        // emit dataReadProgress signal (signal is currently not connected
+                        // to the rest of QNAM) since readProgress of the
+                        // QNonContiguousByteDevice is used
                     emit reply->dataReadProgress(reply->d_func()->totalProgress, 0);
                     // make sure that the reply is valid
                     if (channels[i].reply != reply)
@@ -529,10 +586,20 @@ void QHttpNetworkConnectionPrivate::receiveReply(QAbstractSocket *socket, QHttpN
         QHttpNetworkReplyPrivate::ReplyState state = reply ? reply->d_func()->state : QHttpNetworkReplyPrivate::AllDoneState;
         switch (state) {
         case QHttpNetworkReplyPrivate::NothingDoneState:
-        case QHttpNetworkReplyPrivate::ReadingStatusState:
-            bytes += reply->d_func()->readStatus(socket);
+        case QHttpNetworkReplyPrivate::ReadingStatusState: {
+            qint64 statusBytes = reply->d_func()->readStatus(socket);
+            if (statusBytes == -1) {
+                // error reading the status, close the socket and emit error
+                socket->close();
+                reply->d_func()->errorString = errorDetail(QNetworkReply::ProtocolFailure, socket);
+                emit reply->finishedWithError(QNetworkReply::ProtocolFailure, reply->d_func()->errorString);
+                QMetaObject::invokeMethod(q, "_q_startNextRequest", Qt::QueuedConnection);
+                break;
+            }
+            bytes += statusBytes;
             channels[i].lastStatus = reply->d_func()->statusCode;
             break;
+        }
         case QHttpNetworkReplyPrivate::ReadingHeaderState:
             bytes += reply->d_func()->readHeader(socket);
             if (reply->d_func()->state == QHttpNetworkReplyPrivate::ReadingDataState) {
@@ -569,6 +636,9 @@ void QHttpNetworkConnectionPrivate::receiveReply(QAbstractSocket *socket, QHttpN
                         // make sure that the reply is valid
                         if (channels[i].reply != reply)
                             return;
+                        // emit dataReadProgress signal (signal is currently not connected
+                        // to the rest of QNAM) since readProgress of the
+                        // QNonContiguousByteDevice is used
                         emit reply->dataReadProgress(reply->d_func()->totalProgress, reply->d_func()->bodyLength);
                         // make sure that the reply is valid
                         if (channels[i].reply != reply)
@@ -635,8 +705,25 @@ void QHttpNetworkConnectionPrivate::handleStatus(QAbstractSocket *socket, QHttpN
     case 407:
         handleAuthenticateChallenge(socket, reply, (statusCode == 407), resend);
         if (resend) {
+            int i = indexOf(socket);
+
+            QNonContiguousByteDevice* uploadByteDevice = channels[i].request.uploadByteDevice();
+            if (uploadByteDevice) {
+                if (uploadByteDevice->reset()) {
+                    channels[i].written = 0;
+                } else {
+                    emitReplyError(socket, reply, QNetworkReply::ContentReSendError);
+                    break;
+                }
+            }
+
             eraseData(reply);
-            sendRequest(socket);
+
+            // also use async _q_startNextRequest so we dont break with closed
+            // proxy or server connections..
+            channels[i].resendCurrent = true;
+            QMetaObject::invokeMethod(q, "_q_startNextRequest", Qt::QueuedConnection);
+
         }
         break;
     default:
@@ -970,6 +1057,7 @@ void QHttpNetworkConnectionPrivate::_q_bytesWritten(qint64 bytes)
     QAbstractSocket *socket = qobject_cast<QAbstractSocket*>(q->sender());
     if (!socket)
         return; // ### error
+    // bytes have been written to the socket. write even more of them :)
     if (isSocketWriting(socket))
         sendRequest(socket);
     // otherwise we do nothing
@@ -1128,80 +1216,21 @@ void QHttpNetworkConnectionPrivate::_q_proxyAuthenticationRequired(const QNetwor
 }
 #endif
 
-void QHttpNetworkConnectionPrivate::_q_dataReadyReadNoBuffer()
+void QHttpNetworkConnectionPrivate::_q_uploadDataReadyRead()
 {
     Q_Q(QHttpNetworkConnection);
-    // data emitted either readyRead()
+    // upload data emitted readyRead()
     // find out which channel it is for
-    QIODevice *sender = qobject_cast<QIODevice *>(q->sender());
+    QObject *sender = q->sender();
 
-    // won't match anything if the qobject_cast above failed
     for (int i = 0; i < channelCount; ++i) {
-        if (sender == channels[i].request.data()) {
+        if (sender == channels[i].request.uploadByteDevice()) {
             sendRequest(channels[i].socket);
             break;
         }
     }
 }
 
-void QHttpNetworkConnectionPrivate::_q_dataReadyReadBuffer()
-{
-    Q_Q(QHttpNetworkConnection);
-    QIODevice *sender = qobject_cast<QIODevice *>(q->sender());
-    HttpMessagePair *thePair = 0;
-    for (int i = 0; !thePair && i < lowPriorityQueue.size(); ++i)
-        if (lowPriorityQueue.at(i).first.data() == sender)
-            thePair = &lowPriorityQueue[i];
-
-    for (int i = 0; !thePair && i < highPriorityQueue.size(); ++i)
-        if (highPriorityQueue.at(i).first.data() == sender)
-            thePair = &highPriorityQueue[i];
-
-    if (thePair) {
-        bufferData(*thePair);
-
-        // are we finished buffering?
-        if (!thePair->second->d_func()->requestIsBuffering)
-            _q_startNextRequest();
-    }
-}
-
-void QHttpNetworkConnectionPrivate::bufferData(HttpMessagePair &messagePair)
-{
-    Q_Q(QHttpNetworkConnection);
-    QHttpNetworkRequest &request = messagePair.first;
-    QHttpNetworkReply *reply = messagePair.second;
-    Q_ASSERT(request.data());
-    if (!reply->d_func()->requestIsBuffering) { // first time
-        QObject::connect(request.data(), SIGNAL(readyRead()), q, SLOT(_q_dataReadyReadBuffer()));
-        QObject::connect(request.data(), SIGNAL(readChannelFinished()), q, SLOT(_q_dataReadyReadBuffer()));
-        reply->d_func()->requestIsBuffering = true;
-        reply->d_func()->requestDataBuffer.open(QIODevice::ReadWrite);
-    }
-
-    // always try to read at least one byte
-    // ### FIXME! use a QRingBuffer
-    qint64 bytesToRead = qMax<qint64>(1, request.data()->bytesAvailable());
-    QByteArray newData;
-    newData.resize(bytesToRead);
-    qint64 bytesActuallyRead = request.data()->read(newData.data(), bytesToRead);
-
-    if (bytesActuallyRead > 0) {
-        // we read something
-        newData.chop(bytesToRead - bytesActuallyRead);
-        reply->d_func()->requestDataBuffer.write(newData);
-    } else if (bytesActuallyRead == -1) { // last time
-        QObject::disconnect(request.data(), SIGNAL(readyRead()), q, SLOT(_q_dataReadyReadBuffer()));
-        QObject::disconnect(request.data(), SIGNAL(readChannelFinished()), q, SLOT(_q_dataReadyReadBuffer()));
-
-        request.setContentLength(reply->d_func()->requestDataBuffer.size());
-        reply->d_func()->requestDataBuffer.seek(0);
-        reply->d_func()->requestIsBuffering = false;
-    }
-}
-
-// QHttpNetworkConnection
-
 QHttpNetworkConnection::QHttpNetworkConnection(const QString &hostName, quint16 port, bool encrypt, QObject *parent)
     : QObject(*(new QHttpNetworkConnectionPrivate(hostName, port, encrypt)), parent)
 {
diff --git a/src/network/access/qhttpnetworkconnection_p.h b/src/network/access/qhttpnetworkconnection_p.h
index 09bd459..9b127dd 100644
--- a/src/network/access/qhttpnetworkconnection_p.h
+++ b/src/network/access/qhttpnetworkconnection_p.h
@@ -146,8 +146,7 @@ private:
 #ifndef QT_NO_NETWORKPROXY
     Q_PRIVATE_SLOT(d_func(), void _q_proxyAuthenticationRequired(const QNetworkProxy&, QAuthenticator*))
 #endif
-    Q_PRIVATE_SLOT(d_func(), void _q_dataReadyReadBuffer())
-    Q_PRIVATE_SLOT(d_func(), void _q_dataReadyReadNoBuffer())
+    Q_PRIVATE_SLOT(d_func(), void _q_uploadDataReadyRead())
 
 #ifndef QT_NO_OPENSSL
     Q_PRIVATE_SLOT(d_func(), void _q_encrypted())
@@ -209,8 +208,8 @@ public:
 #ifndef QT_NO_NETWORKPROXY
     void _q_proxyAuthenticationRequired(const QNetworkProxy &proxy, QAuthenticator *auth); // from transparent proxy
 #endif
-    void _q_dataReadyReadNoBuffer();
-    void _q_dataReadyReadBuffer();
+
+    void _q_uploadDataReadyRead();
 
     void createAuthorization(QAbstractSocket *socket, QHttpNetworkRequest &request);
     bool ensureConnection(QAbstractSocket *socket);
@@ -219,7 +218,6 @@ public:
 #ifndef QT_NO_COMPRESS
     bool expand(QAbstractSocket *socket, QHttpNetworkReply *reply, bool dataComplete);
 #endif
-    void bufferData(HttpMessagePair &request);
     void removeReply(QHttpNetworkReply *reply);
 
     QString hostName;
diff --git a/src/network/access/qhttpnetworkreply.cpp b/src/network/access/qhttpnetworkreply.cpp
index fe3f6af..310994c 100644
--- a/src/network/access/qhttpnetworkreply.cpp
+++ b/src/network/access/qhttpnetworkreply.cpp
@@ -409,39 +409,62 @@ qint64 QHttpNetworkReplyPrivate::readStatus(QAbstractSocket *socket)
             if (fragment.endsWith('\r')) {
                 fragment.truncate(fragment.length()-1);
             }
-            parseStatus(fragment);
+            bool ok = parseStatus(fragment);
             state = ReadingHeaderState;
             fragment.clear(); // next fragment
+
+            if (!ok)
+                return -1;
             break;
         } else {
             c = 0;
             bytes += socket->read(&c, 1);
             fragment.append(c);
         }
+
+        // is this a valid reply?
+        if (fragment.length() >= 5 && !fragment.startsWith("HTTP/"))
+            return -1;
+
     }
+
     return bytes;
 }
 
-void QHttpNetworkReplyPrivate::parseStatus(const QByteArray &status)
+bool QHttpNetworkReplyPrivate::parseStatus(const QByteArray &status)
 {
-    const QByteArrayMatcher sp(" ");
-    int i = sp.indexIn(status);
-    const QByteArray version = status.mid(0, i);
-    int j = sp.indexIn(status, i + 1);
+    // from RFC 2616:
+    //        Status-Line = HTTP-Version SP Status-Code SP Reason-Phrase CRLF
+    //        HTTP-Version   = "HTTP" "/" 1*DIGIT "." 1*DIGIT
+    // that makes: 'HTTP/n.n xxx Message'
+    // byte count:  0123456789012
+
+    static const int minLength = 11;
+    static const int dotPos = 6;
+    static const int spacePos = 8;
+    static const char httpMagic[] = "HTTP/";
+
+    if (status.length() < minLength
+        || !status.startsWith(httpMagic)
+        || status.at(dotPos) != '.'
+        || status.at(spacePos) != ' ') {
+        // I don't know how to parse this status line
+        return false;
+    }
+
+    // optimize for the valid case: defer checking until the end
+    majorVersion = status.at(dotPos - 1) - '0';
+    minorVersion = status.at(dotPos + 1) - '0';
+
+    int i = spacePos;
+    int j = status.indexOf(' ', i + 1); // j == -1 || at(j) == ' ' so j+1 == 0 && j+1 <= length()
     const QByteArray code = status.mid(i + 1, j - i - 1);
-    const QByteArray reason = status.mid(j + 1, status.count() - j);
 
-    const QByteArrayMatcher slash("/");
-    int k = slash.indexIn(version);
-    const QByteArrayMatcher dot(".");
-    int l = dot.indexIn(version, k);
-    const QByteArray major = version.mid(k + 1, l - k - 1);
-    const QByteArray minor = version.mid(l + 1, version.count() - l);
+    bool ok;
+    statusCode = code.toInt(&ok);
+    reasonPhrase = QString::fromLatin1(status.constData() + j + 1);
 
-    majorVersion = QString::fromAscii(major.constData()).toInt();
-    minorVersion = QString::fromAscii(minor.constData()).toInt();
-    statusCode = QString::fromAscii(code.constData()).toInt();
-    reasonPhrase = QString::fromAscii(reason.constData());
+    return ok && uint(majorVersion) <= 9 && uint(minorVersion) <= 9;
 }
 
 qint64 QHttpNetworkReplyPrivate::readHeader(QAbstractSocket *socket)
@@ -521,13 +544,13 @@ qint64 QHttpNetworkReplyPrivate::readBody(QAbstractSocket *socket, QIODevice *ou
 {
     qint64 bytes = 0;
     if (isChunked()) {
-        bytes += transferChunked(socket, out); // chunked transfer encoding (rfc 2616, sec 3.6)
+        bytes += readReplyBodyChunked(socket, out); // chunked transfer encoding (rfc 2616, sec 3.6)
     } else if (bodyLength > 0) { // we have a Content-Length
-        bytes += transferRaw(socket, out, bodyLength - contentRead);
+        bytes += readReplyBodyRaw(socket, out, bodyLength - contentRead);
         if (contentRead + bytes == bodyLength)
             state = AllDoneState;
     } else {
-        bytes += transferRaw(socket, out, socket->bytesAvailable());
+        bytes += readReplyBodyRaw(socket, out, socket->bytesAvailable());
     }
     if (state == AllDoneState)
         socket->readAll(); // Read the rest to clean (CRLF)
@@ -535,7 +558,7 @@ qint64 QHttpNetworkReplyPrivate::readBody(QAbstractSocket *socket, QIODevice *ou
     return bytes;
 }
 
-qint64 QHttpNetworkReplyPrivate::transferRaw(QIODevice *in, QIODevice *out, qint64 size)
+qint64 QHttpNetworkReplyPrivate::readReplyBodyRaw(QIODevice *in, QIODevice *out, qint64 size)
 {
     qint64 bytes = 0;
     Q_ASSERT(in);
@@ -561,7 +584,7 @@ qint64 QHttpNetworkReplyPrivate::transferRaw(QIODevice *in, QIODevice *out, qint
 
 }
 
-qint64 QHttpNetworkReplyPrivate::transferChunked(QIODevice *in, QIODevice *out)
+qint64 QHttpNetworkReplyPrivate::readReplyBodyChunked(QIODevice *in, QIODevice *out)
 {
     qint64 bytes = 0;
     while (in->bytesAvailable()) { // while we can read from input
@@ -660,4 +683,4 @@ void QHttpNetworkReply::ignoreSslErrors()
 
 QT_END_NAMESPACE
 
-#endif // QT_NO_HTTP
\ No newline at end of file
+#endif // QT_NO_HTTP
diff --git a/src/network/access/qhttpnetworkreply_p.h b/src/network/access/qhttpnetworkreply_p.h
index c17c65c..cc5cce8 100644
--- a/src/network/access/qhttpnetworkreply_p.h
+++ b/src/network/access/qhttpnetworkreply_p.h
@@ -139,7 +139,7 @@ Q_SIGNALS:
     void finishedWithError(QNetworkReply::NetworkError errorCode, const QString &detail = QString());
     void headerChanged();
     void dataReadProgress(int done, int total);
-    void dataSendProgress(int done, int total);
+    void dataSendProgress(qint64 done, qint64 total);
 
 private:
     Q_DECLARE_PRIVATE(QHttpNetworkReply)
@@ -154,7 +154,7 @@ public:
     QHttpNetworkReplyPrivate(const QUrl &newUrl = QUrl());
     ~QHttpNetworkReplyPrivate();
     qint64 readStatus(QAbstractSocket *socket);
-    void parseStatus(const QByteArray &status);
+    bool parseStatus(const QByteArray &status);
     qint64 readHeader(QAbstractSocket *socket);
     void parseHeader(const QByteArray &header);
     qint64 readBody(QAbstractSocket *socket, QIODevice *out);
@@ -162,8 +162,8 @@ public:
     QAuthenticatorPrivate::Method authenticationMethod(bool isProxy) const;
     void clear();
 
-    qint64 transferRaw(QIODevice *in, QIODevice *out, qint64 size);
-    qint64 transferChunked(QIODevice *in, QIODevice *out);
+    qint64 readReplyBodyRaw(QIODevice *in, QIODevice *out, qint64 size);
+    qint64 readReplyBodyChunked(QIODevice *in, QIODevice *out);
     qint64 getChunkSize(QIODevice *in, qint64 *chunkSize);
 
     qint64 bytesAvailable() const;
@@ -206,7 +206,6 @@ public:
 
     QByteArray responseData; // uncompressed body
     QByteArray compressedData; // compressed body (temporary)
-    QBuffer requestDataBuffer;
     bool requestIsBuffering;
     bool requestIsPrepared;
 };
diff --git a/src/network/access/qhttpnetworkrequest.cpp b/src/network/access/qhttpnetworkrequest.cpp
index 420cb69..7df68fc 100644
--- a/src/network/access/qhttpnetworkrequest.cpp
+++ b/src/network/access/qhttpnetworkrequest.cpp
@@ -40,12 +40,13 @@
 ****************************************************************************/
 
 #include "qhttpnetworkrequest_p.h"
+#include "private/qnoncontiguousbytedevice_p.h"
 
 QT_BEGIN_NAMESPACE
 
 QHttpNetworkRequestPrivate::QHttpNetworkRequestPrivate(QHttpNetworkRequest::Operation op,
         QHttpNetworkRequest::Priority pri, const QUrl &newUrl)
-    : QHttpNetworkHeaderPrivate(newUrl), operation(op), priority(pri), data(0),
+    : QHttpNetworkHeaderPrivate(newUrl), operation(op), priority(pri), uploadByteDevice(0),
       autoDecompress(false)
 {
 }
@@ -55,7 +56,7 @@ QHttpNetworkRequestPrivate::QHttpNetworkRequestPrivate(const QHttpNetworkRequest
 {
     operation = other.operation;
     priority = other.priority;
-    data = other.data;
+    uploadByteDevice = other.uploadByteDevice;
     autoDecompress = other.autoDecompress;
 }
 
@@ -67,7 +68,7 @@ bool QHttpNetworkRequestPrivate::operator==(const QHttpNetworkRequestPrivate &ot
 {
     return QHttpNetworkHeaderPrivate::operator==(other)
         && (operation == other.operation)
-        && (data == other.data);
+        && (uploadByteDevice == other.uploadByteDevice);
 }
 
 QByteArray QHttpNetworkRequestPrivate::methodName() const
@@ -109,7 +110,7 @@ QByteArray QHttpNetworkRequestPrivate::uri(bool throughProxy) const
     QUrl::FormattingOptions format(QUrl::RemoveFragment);
 
     // for POST, query data is send as content
-    if (operation == QHttpNetworkRequest::Post && !data)
+    if (operation == QHttpNetworkRequest::Post && !uploadByteDevice)
         format |= QUrl::RemoveQuery;
     // for requests through proxy, the Request-URI contains full url
     if (throughProxy)
@@ -140,7 +141,7 @@ QByteArray QHttpNetworkRequestPrivate::header(const QHttpNetworkRequest &request
         // add content type, if not set in the request
         if (request.headerField("content-type").isEmpty())
             ba += "Content-Type: application/x-www-form-urlencoded\r\n";
-        if (!request.d->data && request.d->url.hasQuery()) {
+        if (!request.d->uploadByteDevice && request.d->url.hasQuery()) {
             QByteArray query = request.d->url.encodedQuery();
             ba += "Content-Length: "+ QByteArray::number(query.size()) + "\r\n";
             ba += "\r\n";
@@ -236,14 +237,14 @@ void QHttpNetworkRequest::setPriority(Priority priority)
     d->priority = priority;
 }
 
-QIODevice *QHttpNetworkRequest::data() const
+void QHttpNetworkRequest::setUploadByteDevice(QNonContiguousByteDevice *bd)
 {
-    return d->data;
+    d->uploadByteDevice = bd;
 }
 
-void QHttpNetworkRequest::setData(QIODevice *data)
+QNonContiguousByteDevice* QHttpNetworkRequest::uploadByteDevice() const
 {
-    d->data = data;
+    return d->uploadByteDevice;
 }
 
 int QHttpNetworkRequest::majorVersion() const
diff --git a/src/network/access/qhttpnetworkrequest_p.h b/src/network/access/qhttpnetworkrequest_p.h
index d18e116..ed4325a 100644
--- a/src/network/access/qhttpnetworkrequest_p.h
+++ b/src/network/access/qhttpnetworkrequest_p.h
@@ -58,6 +58,8 @@
 
 QT_BEGIN_NAMESPACE
 
+class QNonContiguousByteDevice;
+
 class QHttpNetworkRequestPrivate;
 class Q_AUTOTEST_EXPORT QHttpNetworkRequest: public QHttpNetworkHeader
 {
@@ -104,8 +106,8 @@ public:
     Priority priority() const;
     void setPriority(Priority priority);
 
-    QIODevice *data() const;
-    void setData(QIODevice *data);
+    void setUploadByteDevice(QNonContiguousByteDevice *bd);
+    QNonContiguousByteDevice* uploadByteDevice() const;
 
 private:
     QSharedDataPointer<QHttpNetworkRequestPrivate> d;
@@ -113,7 +115,6 @@ private:
     friend class QHttpNetworkConnectionPrivate;
 };
 
-
 class QHttpNetworkRequestPrivate : public QHttpNetworkHeaderPrivate
 {
 public:
@@ -129,7 +130,7 @@ public:
 
     QHttpNetworkRequest::Operation operation;
     QHttpNetworkRequest::Priority priority;
-    mutable QIODevice *data;
+    mutable QNonContiguousByteDevice* uploadByteDevice;
     bool autoDecompress;
 };
 
diff --git a/src/network/access/qnetworkaccessbackend.cpp b/src/network/access/qnetworkaccessbackend.cpp
index df468b8..b9d1b85 100644
--- a/src/network/access/qnetworkaccessbackend.cpp
+++ b/src/network/access/qnetworkaccessbackend.cpp
@@ -50,6 +50,8 @@
 #include "qnetworkaccesscachebackend_p.h"
 #include "qabstractnetworkcache.h"
 
+#include "private/qnoncontiguousbytedevice_p.h"
+
 QT_BEGIN_NAMESPACE
 
 static bool factoryDataShutdown = false;
@@ -109,17 +111,43 @@ QNetworkAccessBackend *QNetworkAccessManagerPrivate::findBackend(QNetworkAccessM
     return 0;
 }
 
-QNetworkAccessBackend::QNetworkAccessBackend()
+
+QNonContiguousByteDevice* QNetworkAccessBackend::createUploadByteDevice()
 {
+    QNonContiguousByteDevice* device = 0;
+
+    if (reply->outgoingDataBuffer)
+        device = QNonContiguousByteDeviceFactory::create(reply->outgoingDataBuffer);
+    else
+        device = QNonContiguousByteDeviceFactory::create(reply->outgoingData);
+
+    bool bufferDisallowed =
+            reply->request.attribute(QNetworkRequest::DoNotBufferUploadDataAttribute,
+                          QVariant(false)) == QVariant(true);
+    if (bufferDisallowed)
+        device->disableReset();
+
+    // make sure we delete this later
+    device->setParent(this);
+
+    connect(device, SIGNAL(readProgress(qint64,qint64)), this, SLOT(emitReplyUploadProgress(qint64,qint64)));
+
+    return device;
 }
 
-QNetworkAccessBackend::~QNetworkAccessBackend()
+// need to have this function since the reply is a private member variable
+// and the special backends need to access this.
+void QNetworkAccessBackend::emitReplyUploadProgress(qint64 bytesSent, qint64 bytesTotal)
 {
+    reply->emitUploadProgress(bytesSent, bytesTotal);
 }
 
-void QNetworkAccessBackend::upstreamReadyRead()
+QNetworkAccessBackend::QNetworkAccessBackend()
+{
+}
+
+QNetworkAccessBackend::~QNetworkAccessBackend()
 {
-    // do nothing
 }
 
 void QNetworkAccessBackend::downstreamReadyWrite()
@@ -184,23 +212,6 @@ bool QNetworkAccessBackend::isCachingEnabled() const
     return reply->isCachingEnabled();
 }
 
-qint64 QNetworkAccessBackend::upstreamBytesAvailable() const
-{
-    return reply->writeBuffer.size();
-}
-
-void QNetworkAccessBackend::upstreamBytesConsumed(qint64 count)
-{
-    // remove count bytes from the write buffer
-    reply->consume(count);
-}
-
-QByteArray QNetworkAccessBackend::readUpstream()
-{
-    // ### this is expensive. Consider making QRingBuffer::peekAll keep the buffer it returns
-    return reply->writeBuffer.peek(upstreamBytesAvailable());
-}
-
 qint64 QNetworkAccessBackend::nextDownstreamBlockSize() const
 {
     return reply->nextDownstreamBlockSize();
@@ -213,12 +224,12 @@ qint64 QNetworkAccessBackend::downstreamBytesToConsume() const
 
 void QNetworkAccessBackend::writeDownstreamData(const QByteArray &data)
 {
-    reply->feed(data);
+    reply->appendDownstreamData(data);
 }
 
 void QNetworkAccessBackend::writeDownstreamData(QIODevice *data)
 {
-    reply->feed(data);
+    reply->appendDownstreamData(data);
 }
 
 QVariant QNetworkAccessBackend::header(QNetworkRequest::KnownHeaders header) const
diff --git a/src/network/access/qnetworkaccessbackend_p.h b/src/network/access/qnetworkaccessbackend_p.h
index 9012396..6035f3a 100644
--- a/src/network/access/qnetworkaccessbackend_p.h
+++ b/src/network/access/qnetworkaccessbackend_p.h
@@ -70,6 +70,8 @@ class QNetworkAccessManagerPrivate;
 class QNetworkReplyImplPrivate;
 class QAbstractNetworkCache;
 class QNetworkCacheMetaData;
+class QNetworkAccessBackendUploadIODevice;
+class QNonContiguousByteDevice;
 
 // Should support direct file upload from disk or download to disk.
 //
@@ -86,14 +88,13 @@ public:
     // have different names. The Connection has two streams:
     //
     // - Upstream:
-    //   Upstream is data that is being written into this connection,
-    //   from the user. Upstream operates in a "pull" mechanism: the
-    //   connection will be notified that there is more data available
-    //   by a call to "upstreamReadyRead". The number of bytes
-    //   available is given by upstreamBytesAvailable(). A call to
-    //   readUpstream() always yields the entire upstream buffer. When
-    //   the connection has processed a certain amount of bytes from
-    //   that buffer, it should call upstreamBytesConsumed().
+    //   The upstream uses a QNonContiguousByteDevice provided
+    //   by the backend. This device emits the usual readyRead()
+    //   signal when the backend has data available for the connection
+    //   to write. The different backends can listen on this signal
+    //   and then pull upload data from the QNonContiguousByteDevice and
+    //   deal with it.
+    //
     //
     // - Downstream:
     //   Downstream is the data that is being read from this
@@ -111,12 +112,9 @@ public:
 
     virtual void open() = 0;
     virtual void closeDownstreamChannel() = 0;
-    virtual void closeUpstreamChannel() = 0;
     virtual bool waitForDownstreamReadyRead(int msecs) = 0;
-    virtual bool waitForUpstreamBytesWritten(int msecs) = 0;
 
     // slot-like:
-    virtual void upstreamReadyRead();
     virtual void downstreamReadyWrite();
     virtual void copyFinished(QIODevice *);
     virtual void ignoreSslErrors();
@@ -155,18 +153,24 @@ public:
     QVariant attribute(QNetworkRequest::Attribute code) const;
     void setAttribute(QNetworkRequest::Attribute code, const QVariant &value);
 
+    // return true if the QNonContiguousByteDevice of the upload
+    // data needs to support reset(). Currently needed for HTTP.
+    // This will possibly enable buffering of the upload data.
+    virtual bool needsResetableUploadData() {return false;};
+
 protected:
-    // these functions control the upstream mechanism
-    // that is, data coming into the backend and out via the connection
-    qint64 upstreamBytesAvailable() const;
-    void upstreamBytesConsumed(qint64 count);
-    QByteArray readUpstream();
+    // Create the device used for reading the upload data
+    QNonContiguousByteDevice* createUploadByteDevice();
+
 
     // these functions control the downstream mechanism
     // that is, data that has come via the connection and is going out the backend
     qint64 nextDownstreamBlockSize() const;
     qint64 downstreamBytesToConsume() const;
     void writeDownstreamData(const QByteArray &data);
+
+public slots:
+    // for task 251801, needs to be a slot to be called asynchronously
     void writeDownstreamData(QIODevice *data);
 
 protected slots:
@@ -179,10 +183,12 @@ protected slots:
     void metaDataChanged();
     void redirectionRequested(const QUrl &destination);
     void sslErrors(const QList<QSslError> &errors);
+    void emitReplyUploadProgress(qint64 bytesSent, qint64 bytesTotal);
 
 private:
     friend class QNetworkAccessManager;
     friend class QNetworkAccessManagerPrivate;
+    friend class QNetworkAccessBackendUploadIODevice;
     QNetworkAccessManagerPrivate *manager;
     QNetworkReplyImplPrivate *reply;
 };
diff --git a/src/network/access/qnetworkaccessdebugpipebackend.cpp b/src/network/access/qnetworkaccessdebugpipebackend.cpp
index 2e5f1b1..d4bda9a 100644
--- a/src/network/access/qnetworkaccessdebugpipebackend.cpp
+++ b/src/network/access/qnetworkaccessdebugpipebackend.cpp
@@ -41,6 +41,8 @@
 
 #include "qnetworkaccessdebugpipebackend_p.h"
 #include "QtCore/qdatastream.h"
+#include <QCoreApplication>
+#include "private/qnoncontiguousbytedevice_p.h"
 
 QT_BEGIN_NAMESPACE
 
@@ -51,12 +53,6 @@ enum {
     WriteBufferSize = ReadBufferSize
 };
 
-struct QNetworkAccessDebugPipeBackend::DataPacket
-{
-    QList<QPair<QByteArray, QByteArray> > headers;
-    QByteArray data;
-};
-
 QNetworkAccessBackend *
 QNetworkAccessDebugPipeBackendFactory::create(QNetworkAccessManager::Operation op,
                                               const QNetworkRequest &request) const
@@ -79,12 +75,14 @@ QNetworkAccessDebugPipeBackendFactory::create(QNetworkAccessManager::Operation o
 }
 
 QNetworkAccessDebugPipeBackend::QNetworkAccessDebugPipeBackend()
-    : incomingPacketSize(0), bareProtocol(false)
+    : bareProtocol(false), hasUploadFinished(false), hasDownloadFinished(false),
+    hasEverythingFinished(false), bytesDownloaded(0), bytesUploaded(0)
 {
 }
 
 QNetworkAccessDebugPipeBackend::~QNetworkAccessDebugPipeBackend()
 {
+    // this is signals disconnect, not network!
     socket.disconnect(this);    // we're not interested in the signals at this point
 }
 
@@ -92,160 +90,150 @@ void QNetworkAccessDebugPipeBackend::open()
 {
     socket.connectToHost(url().host(), url().port(12345));
     socket.setReadBufferSize(ReadBufferSize);
+
+    // socket ready read -> we can push from socket to downstream
     connect(&socket, SIGNAL(readyRead()), SLOT(socketReadyRead()));
-    connect(&socket, SIGNAL(bytesWritten(qint64)), SLOT(socketBytesWritten(qint64)));
     connect(&socket, SIGNAL(error(QAbstractSocket::SocketError)), SLOT(socketError()));
     connect(&socket, SIGNAL(disconnected()), SLOT(socketDisconnected()));
+    connect(&socket, SIGNAL(connected()), SLOT(socketConnected()));
+    // socket bytes written -> we can push more from upstream to socket
+    connect(&socket, SIGNAL(bytesWritten(qint64)), SLOT(socketBytesWritten(qint64)));
 
     bareProtocol = url().queryItemValue(QLatin1String("bare")) == QLatin1String("1");
 
-    if (!bareProtocol) {
-        // "Handshake":
-        // send outgoing metadata and the URL being requested
-        DataPacket packet;
-        //packet.metaData = request().metaData();
-        packet.data = url().toEncoded();
-        send(packet);
+    if (operation() == QNetworkAccessManager::PutOperation) {
+        uploadByteDevice = createUploadByteDevice();
+        QObject::connect(uploadByteDevice, SIGNAL(readyRead()), this, SLOT(uploadReadyReadSlot()));
+        QMetaObject::invokeMethod(this, "uploadReadyReadSlot", Qt::QueuedConnection);
     }
 }
 
-void QNetworkAccessDebugPipeBackend::closeDownstreamChannel()
+void QNetworkAccessDebugPipeBackend::socketReadyRead()
 {
-    if (operation() == QNetworkAccessManager::GetOperation)
-        socket.disconnectFromHost();
+    pushFromSocketToDownstream();
 }
 
-void QNetworkAccessDebugPipeBackend::closeUpstreamChannel()
+void QNetworkAccessDebugPipeBackend::downstreamReadyWrite()
 {
-    if (operation() == QNetworkAccessManager::PutOperation)
-        socket.disconnectFromHost();
-    else if (operation() == QNetworkAccessManager::PostOperation) {
-        send(DataPacket());
-    }
+    pushFromSocketToDownstream();
 }
 
-bool QNetworkAccessDebugPipeBackend::waitForDownstreamReadyRead(int ms)
+void QNetworkAccessDebugPipeBackend::socketBytesWritten(qint64)
 {
-    readyReadEmitted = false;
-    if (socket.bytesAvailable()) {
-        socketReadyRead();
-        if (readyReadEmitted)
-            return true;
-    }
-    socket.waitForReadyRead(ms);
-    return readyReadEmitted;
+    pushFromUpstreamToSocket();
 }
 
-bool QNetworkAccessDebugPipeBackend::waitForUpstreamBytesWritten(int ms)
+void QNetworkAccessDebugPipeBackend::uploadReadyReadSlot()
 {
-    bytesWrittenEmitted = false;
-    upstreamReadyRead();
-    if (bytesWrittenEmitted)
-        return true;
-
-    socket.waitForBytesWritten(ms);
-    return bytesWrittenEmitted;
+    pushFromUpstreamToSocket();
 }
 
-void QNetworkAccessDebugPipeBackend::upstreamReadyRead()
+void QNetworkAccessDebugPipeBackend::pushFromSocketToDownstream()
 {
-    int maxWrite = WriteBufferSize - socket.bytesToWrite();
-    if (maxWrite <= 0)
-        return;                 // can't write yet, wait for the socket to write
-
-    if (bareProtocol) {
-        QByteArray data = readUpstream();
-        if (data.isEmpty())
-            return;
+    QByteArray buffer;
 
-        socket.write(data);
-        upstreamBytesConsumed(data.size());
-        bytesWrittenEmitted = true;
+    if (socket.state() == QAbstractSocket::ConnectingState) {
         return;
     }
 
-    DataPacket packet;
-    packet.data = readUpstream();
-    if (packet.data.isEmpty())
-        return;                 // we'll be called again when there's data
-    if (packet.data.size() > maxWrite)
-        packet.data.truncate(maxWrite);
-
-    if (!send(packet)) {
-        QString msg = QObject::tr("Write error writing to %1: %2")
-                      .arg(url().toString(), socket.errorString());
-        error(QNetworkReply::ProtocolFailure, msg);
+    forever {
+        if (hasDownloadFinished)
+            return;
 
-        finished();
-        return;
+        buffer.resize(ReadBufferSize);
+        qint64 haveRead = socket.read(buffer.data(), ReadBufferSize);
+        
+        if (haveRead == -1) {
+            hasDownloadFinished = true;
+            // this ensures a good last downloadProgress is emitted
+            setHeader(QNetworkRequest::ContentLengthHeader, QVariant());
+            possiblyFinish();
+            break;
+        } else if (haveRead == 0) {
+            break;
+        } else {
+            // have read something
+            buffer.resize(haveRead);
+            bytesDownloaded += haveRead;
+            writeDownstreamData(buffer);
+        }
     }
-    upstreamBytesConsumed(packet.data.size());
-    bytesWrittenEmitted = true;
 }
 
-void QNetworkAccessDebugPipeBackend::downstreamReadyWrite()
+void QNetworkAccessDebugPipeBackend::pushFromUpstreamToSocket()
 {
-    socketReadyRead();
-}
+    // FIXME
+    if (operation() == QNetworkAccessManager::PutOperation) {
+        if (hasUploadFinished)
+            return;
 
-void QNetworkAccessDebugPipeBackend::socketReadyRead()
-{
-    if (bareProtocol) {
-        qint64 bytesToRead = socket.bytesAvailable();
-        if (bytesToRead) {
-            QByteArray buffer;
-            buffer.resize(bytesToRead);
-            qint64 bytesRead = socket.read(buffer.data(), bytesToRead);
-            if (bytesRead < bytesToRead)
-                buffer.truncate(bytesRead);
-            writeDownstreamData(buffer);
-            readyReadEmitted = true;
+        forever {
+            if (socket.bytesToWrite() >= WriteBufferSize)
+                return;
+
+            qint64 haveRead;
+            const char *readPointer = uploadByteDevice->readPointer(WriteBufferSize, haveRead);
+            if (haveRead == -1) {
+                // EOF
+                hasUploadFinished = true;
+                emitReplyUploadProgress(bytesUploaded, bytesUploaded);
+                possiblyFinish();
+                break;
+            } else if (haveRead == 0 || readPointer == 0) {
+                // nothing to read right now, we will be called again later
+                break;
+            } else {
+                qint64 haveWritten;
+                haveWritten = socket.write(readPointer, haveRead);
+
+                if (haveWritten < 0) {
+                    // write error!
+                    QString msg = QCoreApplication::translate("QNetworkAccessDebugPipeBackend", "Write error writing to %1: %2")
+                                  .arg(url().toString(), socket.errorString());
+                    error(QNetworkReply::ProtocolFailure, msg);
+                    finished();
+                    return;
+                } else {
+                    uploadByteDevice->advanceReadPointer(haveWritten);
+                    bytesUploaded += haveWritten;
+                    emitReplyUploadProgress(bytesUploaded, -1);
+                }
+
+                //QCoreApplication::processEvents();
+
+            }
         }
-        return;
     }
+}
 
-    while (canReceive() &&
-           (socket.state() == QAbstractSocket::UnconnectedState || nextDownstreamBlockSize())) {
-        DataPacket packet;
-        if (receive(packet)) {
-            if (!packet.headers.isEmpty()) {
-                QList<QPair<QByteArray, QByteArray> >::ConstIterator
-                    it = packet.headers.constBegin(),
-                    end = packet.headers.constEnd();
-                for ( ; it != end; ++it)
-                    setRawHeader(it->first, it->second);
-                metaDataChanged();
-            }
+void QNetworkAccessDebugPipeBackend::possiblyFinish()
+{
+    if (hasEverythingFinished)
+        return;
+    hasEverythingFinished = true;
 
-            if (!packet.data.isEmpty()) {
-                writeDownstreamData(packet.data);
-                readyReadEmitted = true;
-            }
+    if ((operation() == QNetworkAccessManager::GetOperation) && hasDownloadFinished) {
+        socket.close();
+        finished();
+    } else if ((operation() == QNetworkAccessManager::PutOperation) && hasUploadFinished) {
+        socket.close();
+        finished();
+    }
 
-            if (packet.headers.isEmpty() && packet.data.isEmpty()) {
-                // it's an eof
-                socket.close();
-                readyReadEmitted = true;
-            }
-        } else {
-            // got an error
-            QString msg = QObject::tr("Read error reading from %1: %2")
-                          .arg(url().toString(), socket.errorString());
-            error(QNetworkReply::ProtocolFailure, msg);
 
-            finished();
-            return;
-        }
-    }
 }
 
-void QNetworkAccessDebugPipeBackend::socketBytesWritten(qint64)
+void QNetworkAccessDebugPipeBackend::closeDownstreamChannel()
 {
-    upstreamReadyRead();
+    qWarning() << "QNetworkAccessDebugPipeBackend::closeDownstreamChannel()" << operation();
+    //if (operation() == QNetworkAccessManager::GetOperation)
+    //    socket.disconnectFromHost();
 }
 
+
 void QNetworkAccessDebugPipeBackend::socketError()
 {
+    qWarning() << "QNetworkAccessDebugPipeBackend::socketError()" << socket.error();
     QNetworkReply::NetworkError code;
     switch (socket.error()) {
     case QAbstractSocket::RemoteHostClosedError:
@@ -269,76 +257,27 @@ void QNetworkAccessDebugPipeBackend::socketError()
 
 void QNetworkAccessDebugPipeBackend::socketDisconnected()
 {
-    socketReadyRead();
-    if (incomingPacketSize == 0 && socket.bytesToWrite() == 0) {
+    pushFromSocketToDownstream();
+
+    if (socket.bytesToWrite() == 0) {
         // normal close
-        finished();
     } else {
         // abnormal close
         QString msg = QObject::tr("Remote host closed the connection prematurely on %1")
                              .arg(url().toString());
         error(QNetworkReply::RemoteHostClosedError, msg);
-
         finished();
     }
 }
 
-bool QNetworkAccessDebugPipeBackend::send(const DataPacket &packet)
-{
-    QByteArray ba;
-    {
-        QDataStream stream(&ba, QIODevice::WriteOnly);
-        stream.setVersion(QDataStream::Qt_4_4);
-
-        stream << packet.headers << packet.data;
-    }
-
-    qint32 outgoingPacketSize = ba.size();
-    qint64 written = socket.write((const char*)&outgoingPacketSize, sizeof outgoingPacketSize);
-    written += socket.write(ba);
-    return quint64(written) == (outgoingPacketSize + sizeof outgoingPacketSize);
-}
-
-bool QNetworkAccessDebugPipeBackend::receive(DataPacket &packet)
+void QNetworkAccessDebugPipeBackend::socketConnected()
 {
-    if (!canReceive())
-        return false;
-
-    // canReceive() does the setting up for us
-    Q_ASSERT(socket.bytesAvailable() >= incomingPacketSize);
-    QByteArray incomingPacket = socket.read(incomingPacketSize);
-    QDataStream stream(&incomingPacket, QIODevice::ReadOnly);
-    stream.setVersion(QDataStream::Qt_4_4);
-    stream >> packet.headers >> packet.data;
-
-    // reset for next packet:
-    incomingPacketSize = 0;
-    socket.setReadBufferSize(ReadBufferSize);
-    return true;
 }
 
-bool QNetworkAccessDebugPipeBackend::canReceive()
+bool QNetworkAccessDebugPipeBackend::waitForDownstreamReadyRead(int ms)
 {
-    if (incomingPacketSize == 0) {
-        // read the packet size
-        if (quint64(socket.bytesAvailable()) >= sizeof incomingPacketSize)
-            socket.read((char*)&incomingPacketSize, sizeof incomingPacketSize);
-        else
-            return false;
-    }
-
-    if (incomingPacketSize == 0) {
-        QString msg = QObject::tr("Protocol error: packet of size 0 received");
-        error(QNetworkReply::ProtocolFailure, msg);
-        finished();
-
-        socket.blockSignals(true);
-        socket.abort();
-        socket.blockSignals(false);
-        return false;
-    }
-
-    return socket.bytesAvailable() >= incomingPacketSize;
+    qCritical("QNetworkAccess: Debug pipe backend does not support waitForReadyRead()");
+    return false;
 }
 
 #endif
diff --git a/src/network/access/qnetworkaccessdebugpipebackend_p.h b/src/network/access/qnetworkaccessdebugpipebackend_p.h
index 73a35cf..a13edc4 100644
--- a/src/network/access/qnetworkaccessdebugpipebackend_p.h
+++ b/src/network/access/qnetworkaccessdebugpipebackend_p.h
@@ -66,35 +66,38 @@ class QNetworkAccessDebugPipeBackend: public QNetworkAccessBackend
 {
     Q_OBJECT
 public:
-    struct DataPacket;
     QNetworkAccessDebugPipeBackend();
     virtual ~QNetworkAccessDebugPipeBackend();
 
     virtual void open();
     virtual void closeDownstreamChannel();
-    virtual void closeUpstreamChannel();
     virtual bool waitForDownstreamReadyRead(int msecs);
-    virtual bool waitForUpstreamBytesWritten(int msecs);
 
-    virtual void upstreamReadyRead();
     virtual void downstreamReadyWrite();
 
+protected:
+    void pushFromSocketToDownstream();
+    void pushFromUpstreamToSocket();
+    void possiblyFinish();
+    QNonContiguousByteDevice *uploadByteDevice;
+
 private slots:
+    void uploadReadyReadSlot();
     void socketReadyRead();
     void socketBytesWritten(qint64 bytes);
     void socketError();
     void socketDisconnected();
+    void socketConnected();
 
 private:
     QTcpSocket socket;
-    qint32 incomingPacketSize;
-    bool readyReadEmitted;
-    bool bytesWrittenEmitted;
     bool bareProtocol;
+    bool hasUploadFinished;
+    bool hasDownloadFinished;
+    bool hasEverythingFinished;
 
-    bool send(const DataPacket &packet);
-    bool canReceive();
-    bool receive(DataPacket &packet);
+    qint64 bytesDownloaded;
+    qint64 bytesUploaded;
 };
 
 class QNetworkAccessDebugPipeBackendFactory: public QNetworkAccessBackendFactory
diff --git a/src/network/access/qnetworkaccessfilebackend.cpp b/src/network/access/qnetworkaccessfilebackend.cpp
index 8a5a665..6374fde 100644
--- a/src/network/access/qnetworkaccessfilebackend.cpp
+++ b/src/network/access/qnetworkaccessfilebackend.cpp
@@ -43,6 +43,7 @@
 #include "qfileinfo.h"
 #include "qurlinfo.h"
 #include "qdir.h"
+#include "private/qnoncontiguousbytedevice_p.h"
 
 #include <QtCore/QCoreApplication>
 
@@ -77,7 +78,7 @@ QNetworkAccessFileBackendFactory::create(QNetworkAccessManager::Operation op,
 }
 
 QNetworkAccessFileBackend::QNetworkAccessFileBackend()
-    : totalBytes(0)
+    : uploadByteDevice(0), totalBytes(0), hasUploadFinished(false)
 {
 }
 
@@ -126,6 +127,9 @@ void QNetworkAccessFileBackend::open()
         break;
     case QNetworkAccessManager::PutOperation:
         mode = QIODevice::WriteOnly | QIODevice::Truncate;
+        uploadByteDevice = createUploadByteDevice();
+        QObject::connect(uploadByteDevice, SIGNAL(readyRead()), this, SLOT(uploadReadyReadSlot()));
+        QMetaObject::invokeMethod(this, "uploadReadyReadSlot", Qt::QueuedConnection);
         break;
     default:
         Q_ASSERT_X(false, "QNetworkAccessFileBackend::open",
@@ -152,19 +156,50 @@ void QNetworkAccessFileBackend::open()
     }
 }
 
-void QNetworkAccessFileBackend::closeDownstreamChannel()
+void QNetworkAccessFileBackend::uploadReadyReadSlot()
 {
-    if (operation() == QNetworkAccessManager::GetOperation) {
-        file.close();
-        //downstreamChannelClosed();
+    if (hasUploadFinished)
+        return;
+
+    forever {
+        qint64 haveRead;
+        const char *readPointer = uploadByteDevice->readPointer(-1, haveRead);
+        if (haveRead == -1) {
+            // EOF
+            hasUploadFinished = true;
+            file.flush();
+            file.close();
+            finished();
+            break;
+        } else if (haveRead == 0 || readPointer == 0) {
+            // nothing to read right now, we will be called again later
+            break;
+        } else {
+            qint64 haveWritten;
+            haveWritten = file.write(readPointer, haveRead);
+
+            if (haveWritten < 0) {
+                // write error!
+                QString msg = QCoreApplication::translate("QNetworkAccessFileBackend", "Write error writing to %1: %2")
+                              .arg(url().toString(), file.errorString());
+                error(QNetworkReply::ProtocolFailure, msg);
+
+                finished();
+                return;
+            } else {
+                uploadByteDevice->advanceReadPointer(haveWritten);
+            }
+
+
+            file.flush();
+        }
     }
 }
 
-void QNetworkAccessFileBackend::closeUpstreamChannel()
+void QNetworkAccessFileBackend::closeDownstreamChannel()
 {
-    if (operation() == QNetworkAccessManager::PutOperation) {
+    if (operation() == QNetworkAccessManager::GetOperation) {
         file.close();
-        finished();
     }
 }
 
@@ -174,40 +209,6 @@ bool QNetworkAccessFileBackend::waitForDownstreamReadyRead(int)
     return readMoreFromFile();
 }
 
-bool QNetworkAccessFileBackend::waitForUpstreamBytesWritten(int)
-{
-    Q_ASSERT_X(false, "QNetworkAccessFileBackend::waitForUpstreamBytesWritten",
-               "This function should never have been called, since there is never anything "
-               "left to be written!");
-    return false;
-}
-
-void QNetworkAccessFileBackend::upstreamReadyRead()
-{
-    Q_ASSERT_X(operation() == QNetworkAccessManager::PutOperation, "QNetworkAccessFileBackend",
-               "We're being told to upload data but operation isn't PUT!");
-
-    // there's more data to be written to the file
-    while (upstreamBytesAvailable()) {
-        // write everything and let QFile handle it
-        int written = file.write(readUpstream());
-
-        if (written < 0) {
-            // write error!
-            QString msg = QCoreApplication::translate("QNetworkAccessFileBackend", "Write error writing to %1: %2")
-                                                    .arg(url().toString(), file.errorString());
-            error(QNetworkReply::ProtocolFailure, msg);
-
-            finished();
-            return;
-        }
-
-        // successful write
-        file.flush();
-        upstreamBytesConsumed(written);
-    }
-}
-
 void QNetworkAccessFileBackend::downstreamReadyWrite()
 {
     Q_ASSERT_X(operation() == QNetworkAccessManager::GetOperation, "QNetworkAccessFileBackend",
diff --git a/src/network/access/qnetworkaccessfilebackend_p.h b/src/network/access/qnetworkaccessfilebackend_p.h
index ce7d351..4615c5f 100644
--- a/src/network/access/qnetworkaccessfilebackend_p.h
+++ b/src/network/access/qnetworkaccessfilebackend_p.h
@@ -62,22 +62,25 @@ QT_BEGIN_NAMESPACE
 
 class QNetworkAccessFileBackend: public QNetworkAccessBackend
 {
+    Q_OBJECT
 public:
     QNetworkAccessFileBackend();
     virtual ~QNetworkAccessFileBackend();
 
     virtual void open();
     virtual void closeDownstreamChannel();
-    virtual void closeUpstreamChannel();
     virtual bool waitForDownstreamReadyRead(int msecs);
-    virtual bool waitForUpstreamBytesWritten(int msecs);
 
-    virtual void upstreamReadyRead();
     virtual void downstreamReadyWrite();
 
+public slots:
+    void uploadReadyReadSlot();
+protected:
+    QNonContiguousByteDevice *uploadByteDevice;
 private:
     QFile file;
     qint64 totalBytes;
+    bool hasUploadFinished;
 
     bool loadFileInfo();
     bool readMoreFromFile();
diff --git a/src/network/access/qnetworkaccessftpbackend.cpp b/src/network/access/qnetworkaccessftpbackend.cpp
index ea39dec..ad55b85 100644
--- a/src/network/access/qnetworkaccessftpbackend.cpp
+++ b/src/network/access/qnetworkaccessftpbackend.cpp
@@ -42,6 +42,7 @@
 #include "qnetworkaccessftpbackend_p.h"
 #include "qnetworkaccessmanager_p.h"
 #include "QtNetwork/qauthenticator.h"
+#include "private/qnoncontiguousbytedevice_p.h"
 
 #ifndef QT_NO_FTP
 
@@ -81,41 +82,6 @@ QNetworkAccessFtpBackendFactory::create(QNetworkAccessManager::Operation op,
     return 0;
 }
 
-class QNetworkAccessFtpIODevice: public QIODevice
-{
-    //Q_OBJECT
-public:
-    QNetworkAccessFtpBackend *backend;
-    bool eof;
-
-    inline QNetworkAccessFtpIODevice(QNetworkAccessFtpBackend *parent)
-        : QIODevice(parent), backend(parent), eof(false)
-        { open(ReadOnly); }
-
-    bool isSequential() const { return true; }
-    bool atEnd() const { return backend->upstreamBytesAvailable() == 0; }
-
-    qint64 bytesAvailable() const { return backend->upstreamBytesAvailable(); }
-    qint64 bytesToWrite() const { return backend->downstreamBytesToConsume(); }
-protected:
-    qint64 readData(char *data, qint64 maxlen)
-    {
-        const QByteArray toSend = backend->readUpstream();
-        maxlen = qMin<qint64>(maxlen, toSend.size());
-        if (!maxlen)
-            return eof ? -1 : 0;
-
-        backend->upstreamBytesConsumed(maxlen);
-        memcpy(data, toSend.constData(), maxlen);
-        return maxlen;
-    }
-
-    qint64 writeData(const char *, qint64)
-    { return -1; }
-
-    friend class QNetworkAccessFtpBackend;
-};
-
 class QNetworkAccessFtpFtp: public QFtp, public QNetworkAccessCache::CacheableObject
 {
     // Q_OBJECT
@@ -198,7 +164,11 @@ void QNetworkAccessFtpBackend::open()
         ftpConnectionReady(ftp);
     }
 
-    uploadDevice = new QNetworkAccessFtpIODevice(this);
+    // Put operation
+    if (operation() == QNetworkAccessManager::PutOperation) {
+        uploadDevice = QNonContiguousByteDeviceFactory::wrap(createUploadByteDevice());
+        uploadDevice->setParent(this);
+    }
 }
 
 void QNetworkAccessFtpBackend::closeDownstreamChannel()
@@ -212,16 +182,6 @@ void QNetworkAccessFtpBackend::closeDownstreamChannel()
 #endif
 }
 
-void QNetworkAccessFtpBackend::closeUpstreamChannel()
-{
-    if (operation() == QNetworkAccessManager::PutOperation) {
-        Q_ASSERT(uploadDevice);
-        uploadDevice->eof = true;
-        if (!upstreamBytesAvailable())
-            emit uploadDevice->readyRead();
-    }
-}
-
 bool QNetworkAccessFtpBackend::waitForDownstreamReadyRead(int ms)
 {
     if (!ftp)
@@ -239,18 +199,6 @@ bool QNetworkAccessFtpBackend::waitForDownstreamReadyRead(int ms)
     return false;
 }
 
-bool QNetworkAccessFtpBackend::waitForUpstreamBytesWritten(int ms)
-{
-    Q_UNUSED(ms);
-    qCritical("QNetworkAccess: FTP backend does not support waitForBytesWritten()");
-    return false;
-}
-
-void QNetworkAccessFtpBackend::upstreamReadyRead()
-{
-    // uh... how does QFtp operate?
-}
-
 void QNetworkAccessFtpBackend::downstreamReadyWrite()
 {
     if (state == Transferring && ftp && ftp->bytesAvailable())
diff --git a/src/network/access/qnetworkaccessftpbackend_p.h b/src/network/access/qnetworkaccessftpbackend_p.h
index 9ec2dd8..1bb7ff2 100644
--- a/src/network/access/qnetworkaccessftpbackend_p.h
+++ b/src/network/access/qnetworkaccessftpbackend_p.h
@@ -87,11 +87,8 @@ public:
 
     virtual void open();
     virtual void closeDownstreamChannel();
-    virtual void closeUpstreamChannel();
     virtual bool waitForDownstreamReadyRead(int msecs);
-    virtual bool waitForUpstreamBytesWritten(int msecs);
 
-    virtual void upstreamReadyRead();
     virtual void downstreamReadyWrite();
 
     void disconnectFromFtp();
@@ -105,7 +102,7 @@ public slots:
 private:
     friend class QNetworkAccessFtpIODevice;
     QPointer<QNetworkAccessFtpFtp> ftp;
-    QNetworkAccessFtpIODevice *uploadDevice;
+    QIODevice *uploadDevice;
     qint64 totalBytes;
     int helpId, sizeId, mdtmId;
     bool supportsSize, supportsMdtm;
diff --git a/src/network/access/qnetworkaccesshttpbackend.cpp b/src/network/access/qnetworkaccesshttpbackend.cpp
index a52b5a0..bd364cb 100644
--- a/src/network/access/qnetworkaccesshttpbackend.cpp
+++ b/src/network/access/qnetworkaccesshttpbackend.cpp
@@ -286,37 +286,6 @@ public:
     }
 };
 
-class QNetworkAccessHttpBackendIODevice: public QIODevice
-{
-    // Q_OBJECT
-public:
-    bool eof;
-    QNetworkAccessHttpBackendIODevice(QNetworkAccessHttpBackend *parent)
-        : QIODevice(parent), eof(false)
-    {
-        setOpenMode(ReadOnly);
-    }
-    bool isSequential() const { return true; }
-    qint64 bytesAvailable() const
-    { return static_cast<QNetworkAccessHttpBackend *>(parent())->upstreamBytesAvailable(); }
-
-protected:
-    virtual qint64 readData(char *buffer, qint64 maxlen)
-    {
-        qint64 ret = static_cast<QNetworkAccessHttpBackend *>(parent())->deviceReadData(buffer, maxlen);
-        if (!ret && eof)
-            return -1;
-        return ret;
-    }
-
-    virtual qint64 writeData(const char *, qint64)
-    {
-        return -1;              // cannot write
-    }
-
-    friend class QNetworkAccessHttpBackend;
-};
-
 QNetworkAccessHttpBackend::QNetworkAccessHttpBackend()
     : QNetworkAccessBackend(), httpReply(0), http(0), uploadDevice(0)
 #ifndef QT_NO_OPENSSL
@@ -507,20 +476,19 @@ void QNetworkAccessHttpBackend::postRequest()
     case QNetworkAccessManager::PostOperation:
         invalidateCache();
         httpRequest.setOperation(QHttpNetworkRequest::Post);
-        uploadDevice = new QNetworkAccessHttpBackendIODevice(this);
+        httpRequest.setUploadByteDevice(createUploadByteDevice());
         break;
 
     case QNetworkAccessManager::PutOperation:
         invalidateCache();
         httpRequest.setOperation(QHttpNetworkRequest::Put);
-        uploadDevice = new QNetworkAccessHttpBackendIODevice(this);
+        httpRequest.setUploadByteDevice(createUploadByteDevice());
         break;
 
     default:
         break;                  // can't happen
     }
 
-    httpRequest.setData(uploadDevice);
     httpRequest.setUrl(url());
 
     QList<QByteArray> headers = request().rawHeaderList();
@@ -528,7 +496,9 @@ void QNetworkAccessHttpBackend::postRequest()
         httpRequest.setHeaderField(header, request().rawHeader(header));
 
     if (loadedFromCache) {
-        QNetworkAccessBackend::finished();
+        // commented this out since it will be called later anyway
+        // by copyFinished()
+        //QNetworkAccessBackend::finished();
         return;    // no need to send the request! :)
     }
 
@@ -624,14 +594,6 @@ void QNetworkAccessHttpBackend::closeDownstreamChannel()
     // this indicates that the user closed the stream while the reply isn't finished yet
 }
 
-void QNetworkAccessHttpBackend::closeUpstreamChannel()
-{
-    // this indicates that the user finished uploading the data for POST
-    Q_ASSERT(uploadDevice);
-    uploadDevice->eof = true;
-    emit uploadDevice->readChannelFinished();
-}
-
 bool QNetworkAccessHttpBackend::waitForDownstreamReadyRead(int msecs)
 {
     Q_ASSERT(http);
@@ -651,38 +613,6 @@ bool QNetworkAccessHttpBackend::waitForDownstreamReadyRead(int msecs)
     return false;
 }
 
-bool QNetworkAccessHttpBackend::waitForUpstreamBytesWritten(int msecs)
-{
-
-    // ### FIXME: not implemented in QHttpNetworkAccess
-    Q_UNUSED(msecs);
-    qCritical("QNetworkAccess: HTTP backend does not support waitForBytesWritten()");
-    return false;
-}
-
-void QNetworkAccessHttpBackend::upstreamReadyRead()
-{
-    // There is more data available from the user to be uploaded
-    // QHttpNetworkAccess implements the upload rate control:
-    //  we simply tell QHttpNetworkAccess that there is more data available
-    //  it'll pull from us when it can (through uploadDevice)
-
-    Q_ASSERT(uploadDevice);
-    emit uploadDevice->readyRead();
-}
-
-qint64 QNetworkAccessHttpBackend::deviceReadData(char *buffer, qint64 maxlen)
-{
-    QByteArray toBeUploaded = readUpstream();
-    if (toBeUploaded.isEmpty())
-        return 0;               // nothing to be uploaded
-
-    maxlen = qMin<qint64>(maxlen, toBeUploaded.length());
-
-    memcpy(buffer, toBeUploaded.constData(), maxlen);
-    upstreamBytesConsumed(maxlen);
-    return maxlen;
-}
 
 void QNetworkAccessHttpBackend::downstreamReadyWrite()
 {
@@ -904,7 +834,14 @@ bool QNetworkAccessHttpBackend::sendCacheContents(const QNetworkCacheMetaData &m
 
     checkForRedirect(status);
 
-    writeDownstreamData(contents);
+    emit metaDataChanged();
+
+    // invoke this asynchronously, else Arora/QtDemoBrowser don't like cached downloads
+    // see task 250221 / 251801
+    qRegisterMetaType<QIODevice*>("QIODevice*");
+    QMetaObject::invokeMethod(this, "writeDownstreamData", Qt::QueuedConnection, Q_ARG(QIODevice*, contents));
+
+
 #if defined(QNETWORKACCESSHTTPBACKEND_DEBUG)
     qDebug() << "Successfully sent cache:" << url() << contents->size() << "bytes";
 #endif
@@ -1036,21 +973,39 @@ QNetworkCacheMetaData QNetworkAccessHttpBackend::fetchCacheMetaData(const QNetwo
     if (it != cacheHeaders.rawHeaders.constEnd())
         metaData.setLastModified(QNetworkHeadersPrivate::fromHttpDate(it->second));
 
-    bool canDiskCache = true; // Everything defaults to being cacheable on disk
+    bool canDiskCache;
+    // only cache GET replies by default, all other replies (POST, PUT, DELETE)
+    //  are not cacheable by default (according to RFC 2616 section 9)
+    if (httpReply->request().operation() == QHttpNetworkRequest::Get) {
+
+        canDiskCache = true;
+        // 14.32
+        // HTTP/1.1 caches SHOULD treat "Pragma: no-cache" as if the client
+        // had sent "Cache-Control: no-cache".
+        it = cacheHeaders.findRawHeader("pragma");
+        if (it != cacheHeaders.rawHeaders.constEnd()
+            && it->second == "no-cache")
+            canDiskCache = false;
+
+        // HTTP/1.1. Check the Cache-Control header
+        if (cacheControl.contains("no-cache"))
+            canDiskCache = false;
+        else if (cacheControl.contains("no-store"))
+            canDiskCache = false;
+
+    // responses to POST might be cacheable
+    } else if (httpReply->request().operation() == QHttpNetworkRequest::Post) {
 
-    // 14.32
-    // HTTP/1.1 caches SHOULD treat "Pragma: no-cache" as if the client
-    // had sent "Cache-Control: no-cache".
-    it = cacheHeaders.findRawHeader("pragma");
-    if (it != cacheHeaders.rawHeaders.constEnd()
-        && it->second == "no-cache")
         canDiskCache = false;
+        // some pages contain "expires:" and "cache-control: no-cache" field,
+        // so we only might cache POST requests if we get "cache-control: max-age ..."
+        if (cacheControl.contains("max-age"))
+            canDiskCache = true;
 
-    // HTTP/1.1. Check the Cache-Control header
-    if (cacheControl.contains("no-cache"))
-        canDiskCache = false;
-    else if (cacheControl.contains("no-store"))
+    // responses to PUT and DELETE are not cacheable
+    } else {
         canDiskCache = false;
+    }
 
     metaData.setSaveToDisk(canDiskCache);
     int statusCode = httpReply->statusCode();
diff --git a/src/network/access/qnetworkaccesshttpbackend_p.h b/src/network/access/qnetworkaccesshttpbackend_p.h
index 02915e7..225f944 100644
--- a/src/network/access/qnetworkaccesshttpbackend_p.h
+++ b/src/network/access/qnetworkaccesshttpbackend_p.h
@@ -79,11 +79,8 @@ public:
 
     virtual void open();
     virtual void closeDownstreamChannel();
-    virtual void closeUpstreamChannel();
     virtual bool waitForDownstreamReadyRead(int msecs);
-    virtual bool waitForUpstreamBytesWritten(int msecs);
 
-    virtual void upstreamReadyRead();
     virtual void downstreamReadyWrite();
     virtual void copyFinished(QIODevice *);
 #ifndef QT_NO_OPENSSL
@@ -96,6 +93,9 @@ public:
 
     qint64 deviceReadData(char *buffer, qint64 maxlen);
 
+    // we return true since HTTP needs to send PUT/POST data again after having authenticated
+    bool needsResetableUploadData() {return true;};
+
 private slots:
     void replyReadyRead();
     void replyFinished();
@@ -108,7 +108,8 @@ private:
     QHttpNetworkReply *httpReply;
     QPointer<QNetworkAccessHttpBackendCache> http;
     QByteArray cacheKey;
-    QNetworkAccessHttpBackendIODevice *uploadDevice;
+    QNetworkAccessBackendUploadIODevice *uploadDevice;
+
 #ifndef QT_NO_OPENSSL
     QSslConfiguration *pendingSslConfiguration;
     bool pendingIgnoreSslErrors;
@@ -122,8 +123,6 @@ private:
     void postRequest();
     void readFromHttp();
     void checkForRedirect(const int statusCode);
-
-    friend class QNetworkAccessHttpBackendIODevice;
 };
 
 class QNetworkAccessHttpBackendFactory : public QNetworkAccessBackendFactory
diff --git a/src/network/access/qnetworkaccessmanager.cpp b/src/network/access/qnetworkaccessmanager.cpp
index bcbeef1..bf06ede 100644
--- a/src/network/access/qnetworkaccessmanager.cpp
+++ b/src/network/access/qnetworkaccessmanager.cpp
@@ -686,7 +686,10 @@ QNetworkReply *QNetworkAccessManager::createRequest(QNetworkAccessManager::Opera
         priv->urlForLastAuthentication = url;
     }
 
-    // third step: setup the reply
+    // third step: find a backend
+    priv->backend = d->findBackend(op, request);
+
+    // fourth step: setup the reply
     priv->setup(op, request, outgoingData);
     if (request.attribute(QNetworkRequest::CacheLoadControlAttribute, QNetworkRequest::PreferNetwork).toInt() !=
         QNetworkRequest::AlwaysNetwork)
@@ -695,9 +698,6 @@ QNetworkReply *QNetworkAccessManager::createRequest(QNetworkAccessManager::Opera
     QList<QNetworkProxy> proxyList = d->queryProxy(QNetworkProxyQuery(request.url()));
     priv->proxyList = proxyList;
 #endif
-
-    // fourth step: find a backend
-    priv->backend = d->findBackend(op, request);
     if (priv->backend) {
         priv->backend->setParent(reply);
         priv->backend->reply = priv;
diff --git a/src/network/access/qnetworkreply.cpp b/src/network/access/qnetworkreply.cpp
index f4dad3c..0990b17 100644
--- a/src/network/access/qnetworkreply.cpp
+++ b/src/network/access/qnetworkreply.cpp
@@ -151,6 +151,10 @@ QNetworkReplyPrivate::QNetworkReplyPrivate()
     authentication to serve the content but the credentials provided
     were not accepted (if any)
 
+    \value ContentReSendError          the request needed to be sent
+    again, but this failed for example because the upload data
+    could not be read a second time.
+
     \value ProtocolUnknownError         the Network Access API cannot
     honor the request because the protocol is not known
 
diff --git a/src/network/access/qnetworkreply.h b/src/network/access/qnetworkreply.h
index 6f763b3..2f864fe 100644
--- a/src/network/access/qnetworkreply.h
+++ b/src/network/access/qnetworkreply.h
@@ -92,6 +92,7 @@ public:
         ContentOperationNotPermittedError,
         ContentNotFoundError,
         AuthenticationRequiredError,
+        ContentReSendError,
         UnknownContentError = 299,
 
         // protocol errors
diff --git a/src/network/access/qnetworkreplyimpl.cpp b/src/network/access/qnetworkreplyimpl.cpp
index 79c3d1a..749a462 100644
--- a/src/network/access/qnetworkreplyimpl.cpp
+++ b/src/network/access/qnetworkreplyimpl.cpp
@@ -46,13 +46,15 @@
 #include "QtCore/qcoreapplication.h"
 #include "QtCore/qdatetime.h"
 #include "QtNetwork/qsslconfiguration.h"
+#include "qnetworkaccesshttpbackend_p.h"
 
 #include <QtCore/QCoreApplication>
 
 QT_BEGIN_NAMESPACE
 
 inline QNetworkReplyImplPrivate::QNetworkReplyImplPrivate()
-    : copyDevice(0), networkCache(0),
+    : backend(0), outgoingData(0), outgoingDataBuffer(0),
+      copyDevice(0), networkCache(0),
       cacheEnabled(false), cacheSaveDevice(0),
       bytesDownloaded(0), lastBytesDownloaded(-1), bytesUploaded(-1),
       state(Idle)
@@ -61,8 +63,13 @@ inline QNetworkReplyImplPrivate::QNetworkReplyImplPrivate()
 
 void QNetworkReplyImplPrivate::_q_startOperation()
 {
-    // This function is called exactly once
+    // ensure this function is only being called once
+    if (state == Working) {
+        qDebug("QNetworkReplyImpl::_q_startOperation was called more than once");
+        return;
+    }
     state = Working;
+
     if (!backend) {
         error(QNetworkReplyImpl::ProtocolUnknownError,
               QCoreApplication::translate("QNetworkReply", "Protocol \"%1\" is unknown").arg(url.scheme())); // not really true!;
@@ -74,57 +81,11 @@ void QNetworkReplyImplPrivate::_q_startOperation()
     if (state != Finished) {
         if (operation == QNetworkAccessManager::GetOperation)
             pendingNotifications.append(NotifyDownstreamReadyWrite);
-        if (outgoingData) {
-            _q_sourceReadyRead();
-#if 0 // ### FIXME
-            if (outgoingData->atEndOfStream() && writeBuffer.isEmpty())
-                // empty upload
-                emit q->uploadProgress(0, 0);
-#endif
-        }
 
         handleNotifications();
     }
 }
 
-void QNetworkReplyImplPrivate::_q_sourceReadyRead()
-{
-    // read data from the outgoingData QIODevice into our internal buffer
-    enum { DesiredBufferSize = 32 * 1024 };
-
-    if (writeBuffer.size() >= DesiredBufferSize)
-        return;                 // don't grow the buffer too much
-
-    // read as many bytes are available or up until we fill up the buffer
-    // but always read at least one byte
-    qint64 bytesToRead = qBound<qint64>(1, outgoingData->bytesAvailable(),
-                                        DesiredBufferSize - writeBuffer.size());
-    char *ptr = writeBuffer.reserve(bytesToRead);
-    qint64 bytesActuallyRead = outgoingData->read(ptr, bytesToRead);
-    if (bytesActuallyRead == -1) {
-        // EOF
-        writeBuffer.chop(bytesToRead);
-        backendNotify(NotifyCloseUpstreamChannel);
-        return;
-    }
-
-    if (bytesActuallyRead < bytesToRead)
-        writeBuffer.chop(bytesToRead - bytesActuallyRead);
-
-    // if we did read anything, let the backend know and handle it
-    if (bytesActuallyRead)
-        backendNotify(NotifyUpstreamReadyRead);
-
-    // check for EOF again
-    if (!outgoingData->isSequential() && outgoingData->atEnd())
-        backendNotify(NotifyCloseUpstreamChannel);
-}
-
-void QNetworkReplyImplPrivate::_q_sourceReadChannelFinished()
-{
-    _q_sourceReadyRead();
-}
-
 void QNetworkReplyImplPrivate::_q_copyReadyRead()
 {
     Q_Q(QNetworkReplyImpl);
@@ -143,7 +104,7 @@ void QNetworkReplyImplPrivate::_q_copyReadyRead()
         if (bytesActuallyRead == -1) {
             readBuffer.chop(bytesToRead);
             backendNotify(NotifyCopyFinished);
-            return;
+            break;
         }
 
         if (bytesActuallyRead != bytesToRead)
@@ -151,6 +112,7 @@ void QNetworkReplyImplPrivate::_q_copyReadyRead()
 
         if (!copyDevice->isSequential() && copyDevice->atEnd()) {
             backendNotify(NotifyCopyFinished);
+            bytesDownloaded += bytesActuallyRead;
             break;
         }
 
@@ -174,6 +136,67 @@ void QNetworkReplyImplPrivate::_q_copyReadChannelFinished()
     _q_copyReadyRead();
 }
 
+void QNetworkReplyImplPrivate::_q_bufferOutgoingDataFinished()
+{
+    Q_Q(QNetworkReplyImpl);
+
+    // make sure this is only called once, ever.
+    //_q_bufferOutgoingData may call it or the readChannelFinished emission
+    if (state != Buffering)
+        return;
+
+    // disconnect signals
+    QObject::disconnect(outgoingData, SIGNAL(readyRead()), q, SLOT(_q_bufferOutgoingData()));
+    QObject::disconnect(outgoingData, SIGNAL(readChannelFinished()), q, SLOT(_q_bufferOutgoingDataFinished()));
+
+    // finally, start the request
+    QMetaObject::invokeMethod(q, "_q_startOperation", Qt::QueuedConnection);
+}
+
+void QNetworkReplyImplPrivate::_q_bufferOutgoingData()
+{
+    Q_Q(QNetworkReplyImpl);
+
+    if (!outgoingDataBuffer) {
+        // first call, create our buffer
+        outgoingDataBuffer = new QRingBuffer();
+
+        QObject::connect(outgoingData, SIGNAL(readyRead()), q, SLOT(_q_bufferOutgoingData()));
+        QObject::connect(outgoingData, SIGNAL(readChannelFinished()), q, SLOT(_q_bufferOutgoingDataFinished()));
+    }
+
+    qint64 bytesBuffered = 0;
+    qint64 bytesToBuffer = 0;
+
+    // read data into our buffer
+    forever {
+        bytesToBuffer = outgoingData->bytesAvailable();
+        // unknown? just try 2 kB, this also ensures we always try to read the EOF
+        if (bytesToBuffer <= 0)
+            bytesToBuffer = 2*1024;
+
+        char *dst = outgoingDataBuffer->reserve(bytesToBuffer);
+        bytesBuffered = outgoingData->read(dst, bytesToBuffer);
+
+        if (bytesBuffered == -1) {
+            // EOF has been reached.
+            outgoingDataBuffer->chop(bytesToBuffer);
+
+            _q_bufferOutgoingDataFinished();
+            break;
+        } else if (bytesBuffered == 0) {
+            // nothing read right now, just wait until we get called again
+            outgoingDataBuffer->chop(bytesToBuffer);
+
+            break;
+        } else {
+            // don't break, try to read() again
+            outgoingDataBuffer->chop(bytesToBuffer - bytesBuffered);
+        }
+    }
+}
+
+
 void QNetworkReplyImplPrivate::setup(QNetworkAccessManager::Operation op, const QNetworkRequest &req,
                                      QIODevice *data)
 {
@@ -184,13 +207,42 @@ void QNetworkReplyImplPrivate::setup(QNetworkAccessManager::Operation op, const
     url = request.url();
     operation = op;
 
-    if (outgoingData) {
-        q->connect(outgoingData, SIGNAL(readyRead()), SLOT(_q_sourceReadyRead()));
-        q->connect(outgoingData, SIGNAL(readChannelFinished()), SLOT(_q_sourceReadChannelFinished()));
+    if (outgoingData && backend) {
+        // there is data to be uploaded, e.g. HTTP POST.
+
+        if (!backend->needsResetableUploadData() || !outgoingData->isSequential()) {
+            // backend does not need upload buffering or
+            // fixed size non-sequential
+            // just start the operation
+            QMetaObject::invokeMethod(q, "_q_startOperation", Qt::QueuedConnection);
+        } else {
+            bool bufferingDisallowed =
+                    req.attribute(QNetworkRequest::DoNotBufferUploadDataAttribute,
+                                             false).toBool();
+
+            if (bufferingDisallowed) {
+                // if a valid content-length header for the request was supplied, we can disable buffering
+                // if not, we will buffer anyway
+                if (req.header(QNetworkRequest::ContentLengthHeader).isValid()) {
+                    QMetaObject::invokeMethod(q, "_q_startOperation", Qt::QueuedConnection);
+                } else {
+                    state = Buffering;
+                    QMetaObject::invokeMethod(q, "_q_bufferOutgoingData", Qt::QueuedConnection);
+                }
+            } else {
+                // _q_startOperation will be called when the buffering has finished.
+                state = Buffering;
+                QMetaObject::invokeMethod(q, "_q_bufferOutgoingData", Qt::QueuedConnection);
+            }
+        }
+    } else {
+        // No outgoing data (e.g. HTTP GET request)
+        // or no backend
+        // if no backend, _q_startOperation will handle the error of this
+        QMetaObject::invokeMethod(q, "_q_startOperation", Qt::QueuedConnection);
     }
 
     q->QIODevice::open(QIODevice::ReadOnly);
-    QMetaObject::invokeMethod(q, "_q_startOperation", Qt::QueuedConnection);
 }
 
 void QNetworkReplyImplPrivate::setNetworkCache(QAbstractNetworkCache *nc)
@@ -226,18 +278,10 @@ void QNetworkReplyImplPrivate::handleNotifications()
                 backend->downstreamReadyWrite();
             break;
 
-        case NotifyUpstreamReadyRead:
-            backend->upstreamReadyRead();
-            break;
-
         case NotifyCloseDownstreamChannel:
             backend->closeDownstreamChannel();
             break;
 
-        case NotifyCloseUpstreamChannel:
-            backend->closeUpstreamChannel();
-            break;
-
         case NotifyCopyFinished: {
             QIODevice *dev = copyDevice;
             copyDevice = 0;
@@ -299,29 +343,14 @@ void QNetworkReplyImplPrivate::completeCacheSave()
     cacheEnabled = false;
 }
 
-void QNetworkReplyImplPrivate::consume(qint64 count)
+void QNetworkReplyImplPrivate::emitUploadProgress(qint64 bytesSent, qint64 bytesTotal)
 {
     Q_Q(QNetworkReplyImpl);
-    if (count <= 0) {
-        qWarning("QNetworkConnection: backend signalled that it consumed %ld bytes", long(count));
-        return;
-    }
-
-    if (outgoingData)
-        // schedule another read from the source
-        QMetaObject::invokeMethod(q_func(), "_q_sourceReadyRead", Qt::QueuedConnection);
-
-    writeBuffer.skip(count);
-    if (bytesUploaded == -1)
-        bytesUploaded = count;
-    else
-        bytesUploaded += count;
-
-    QVariant totalSize = request.header(QNetworkRequest::ContentLengthHeader);
-    emit q->uploadProgress(bytesUploaded,
-                           totalSize.isNull() ? Q_INT64_C(-1) : totalSize.toLongLong());
+    bytesUploaded = bytesSent;
+    emit q->uploadProgress(bytesSent, bytesTotal);
 }
 
+
 qint64 QNetworkReplyImplPrivate::nextDownstreamBlockSize() const
 {
     enum { DesiredBufferSize = 32 * 1024 };
@@ -331,7 +360,9 @@ qint64 QNetworkReplyImplPrivate::nextDownstreamBlockSize() const
     return qMax<qint64>(0, readBufferMaxSize - readBuffer.size());
 }
 
-void QNetworkReplyImplPrivate::feed(const QByteArray &data)
+// we received downstream data and send this to the cache
+// and to our readBuffer (which in turn gets read by the user of QNetworkReply)
+void QNetworkReplyImplPrivate::appendDownstreamData(const QByteArray &data)
 {
     Q_Q(QNetworkReplyImpl);
     if (!q->isOpen())
@@ -379,7 +410,8 @@ void QNetworkReplyImplPrivate::feed(const QByteArray &data)
     }
 }
 
-void QNetworkReplyImplPrivate::feed(QIODevice *data)
+// this is used when it was fetched from the cache, right?
+void QNetworkReplyImplPrivate::appendDownstreamData(QIODevice *data)
 {
     Q_Q(QNetworkReplyImpl);
     Q_ASSERT(q->isOpen());
@@ -409,9 +441,11 @@ void QNetworkReplyImplPrivate::finished()
     pendingNotifications.clear();
 
     QVariant totalSize = cookedHeaders.value(QNetworkRequest::ContentLengthHeader);
-    if (bytesDownloaded != lastBytesDownloaded || totalSize.isNull())
+    if (totalSize.isNull() || totalSize == -1) {
         emit q->downloadProgress(bytesDownloaded, bytesDownloaded);
-    if (bytesUploaded == -1 && outgoingData)
+    }
+
+    if (bytesUploaded == -1 && (outgoingData || outgoingDataBuffer))
         emit q->uploadProgress(0, 0);
 
     completeCacheSave();
diff --git a/src/network/access/qnetworkreplyimpl_p.h b/src/network/access/qnetworkreplyimpl_p.h
index ad06f78..8d3c90e 100644
--- a/src/network/access/qnetworkreplyimpl_p.h
+++ b/src/network/access/qnetworkreplyimpl_p.h
@@ -59,6 +59,7 @@
 #include "qnetworkproxy.h"
 #include "QtCore/qmap.h"
 #include "QtCore/qqueue.h"
+#include "QtCore/qbuffer.h"
 #include "private/qringbuffer_p.h"
 
 QT_BEGIN_NAMESPACE
@@ -91,10 +92,10 @@ public:
 
     Q_DECLARE_PRIVATE(QNetworkReplyImpl)
     Q_PRIVATE_SLOT(d_func(), void _q_startOperation())
-    Q_PRIVATE_SLOT(d_func(), void _q_sourceReadyRead())
-    Q_PRIVATE_SLOT(d_func(), void _q_sourceReadChannelFinished())
     Q_PRIVATE_SLOT(d_func(), void _q_copyReadyRead())
     Q_PRIVATE_SLOT(d_func(), void _q_copyReadChannelFinished())
+    Q_PRIVATE_SLOT(d_func(), void _q_bufferOutgoingData())
+    Q_PRIVATE_SLOT(d_func(), void _q_bufferOutgoingDataFinished())
 };
 
 class QNetworkReplyImplPrivate: public QNetworkReplyPrivate
@@ -102,15 +103,13 @@ class QNetworkReplyImplPrivate: public QNetworkReplyPrivate
 public:
     enum InternalNotifications {
         NotifyDownstreamReadyWrite,
-        NotifyUpstreamReadyRead,
         NotifyCloseDownstreamChannel,
-        NotifyCloseUpstreamChannel,
         NotifyCopyFinished
     };
 
     enum State {
         Idle,
-        Opening,
+        Buffering,
         Working,
         Finished,
         Aborted
@@ -125,6 +124,8 @@ public:
     void _q_sourceReadChannelFinished();
     void _q_copyReadyRead();
     void _q_copyReadChannelFinished();
+    void _q_bufferOutgoingData();
+    void _q_bufferOutgoingDataFinished();
 
     void setup(QNetworkAccessManager::Operation op, const QNetworkRequest &request,
                QIODevice *outgoingData);
@@ -138,9 +139,10 @@ public:
     void setCachingEnabled(bool enable);
     bool isCachingEnabled() const;
     void consume(qint64 count);
+    void emitUploadProgress(qint64 bytesSent, qint64 bytesTotal);
     qint64 nextDownstreamBlockSize() const;
-    void feed(const QByteArray &data);
-    void feed(QIODevice *data);
+    void appendDownstreamData(const QByteArray &data);
+    void appendDownstreamData(QIODevice *data);
     void finished();
     void error(QNetworkReply::NetworkError code, const QString &errorString);
     void metaDataChanged();
@@ -149,6 +151,7 @@ public:
 
     QNetworkAccessBackend *backend;
     QIODevice *outgoingData;
+    QRingBuffer *outgoingDataBuffer;
     QIODevice *copyDevice;
     QAbstractNetworkCache *networkCache;
 
diff --git a/src/network/access/qnetworkrequest.cpp b/src/network/access/qnetworkrequest.cpp
index 56b793d..8b1afba 100644
--- a/src/network/access/qnetworkrequest.cpp
+++ b/src/network/access/qnetworkrequest.cpp
@@ -162,6 +162,13 @@ QT_BEGIN_NAMESPACE
         Indicates whether the data was obtained from cache
         or not.
 
+    \value DoNotBufferUploadDataAttribute
+        Requests only, type: QVariant::Bool (default: false)
+        Indicates whether the QNetworkAccessManager code is
+        allowed to buffer the upload data, e.g. when doing a HTTP POST.
+        When using this flag with sequential upload data, the ContentLengthHeader
+        header must be set.
+
     \value User
         Special type. Additional information can be passed in
         QVariants with types ranging from User to UserMax. The default
diff --git a/src/network/access/qnetworkrequest.h b/src/network/access/qnetworkrequest.h
index 6f34bce..5dea1df 100644
--- a/src/network/access/qnetworkrequest.h
+++ b/src/network/access/qnetworkrequest.h
@@ -75,6 +75,7 @@ public:
         CacheLoadControlAttribute,
         CacheSaveControlAttribute,
         SourceIsFromCacheAttribute,
+        DoNotBufferUploadDataAttribute,
 
         User = 1000,
         UserMax = 32767
diff --git a/src/plugins/accessible/widgets/simplewidgets.h b/src/plugins/accessible/widgets/simplewidgets.h
index d4552e3..d1fd0da 100644
--- a/src/plugins/accessible/widgets/simplewidgets.h
+++ b/src/plugins/accessible/widgets/simplewidgets.h
@@ -115,6 +115,7 @@ public:
 class QAccessibleLineEdit : public QAccessibleWidgetEx, public QAccessibleTextInterface,
                             public QAccessibleSimpleEditableTextInterface
 {
+    Q_ACCESSIBLE_OBJECT
 public:
     explicit QAccessibleLineEdit(QWidget *o, const QString &name = QString());
 
diff --git a/src/plugins/gfxdrivers/directfb/qdirectfbpaintengine.cpp b/src/plugins/gfxdrivers/directfb/qdirectfbpaintengine.cpp
index 91a60e7..989a37a 100644
--- a/src/plugins/gfxdrivers/directfb/qdirectfbpaintengine.cpp
+++ b/src/plugins/gfxdrivers/directfb/qdirectfbpaintengine.cpp
@@ -275,7 +275,6 @@ private:
     int lastLockedHeight;
 
     IDirectFB *fb;
-    DFBSurfaceDescription fbDescription;
     int fbWidth;
     int fbHeight;
 
diff --git a/src/plugins/gfxdrivers/directfb/qdirectfbpixmap.cpp b/src/plugins/gfxdrivers/directfb/qdirectfbpixmap.cpp
index 7297a99..c9b676a 100644
--- a/src/plugins/gfxdrivers/directfb/qdirectfbpixmap.cpp
+++ b/src/plugins/gfxdrivers/directfb/qdirectfbpixmap.cpp
@@ -271,7 +271,7 @@ void QDirectFBPixmapData::fill(const QColor &color)
         forceRaster = false;
         setSerialNumber(++global_ser_no);
         if (!dfbSurface) {
-            qWarning("QDirecttFBPixmapData::fill()");
+            qWarning("QDirectFBPixmapData::fill()");
             invalidate();
             return;
         }
diff --git a/src/plugins/gfxdrivers/directfb/qdirectfbscreen.cpp b/src/plugins/gfxdrivers/directfb/qdirectfbscreen.cpp
index f571d1b..98e32ed 100644
--- a/src/plugins/gfxdrivers/directfb/qdirectfbscreen.cpp
+++ b/src/plugins/gfxdrivers/directfb/qdirectfbscreen.cpp
@@ -205,6 +205,7 @@ IDirectFBSurface *QDirectFBScreen::createDFBSurface(const QSize &size,
                                                     SurfaceCreationOptions options)
 {
     DFBSurfaceDescription desc;
+    memset(&desc, 0, sizeof(DFBSurfaceDescription));
     desc.flags = DFBSurfaceDescriptionFlags(DSDESC_WIDTH|DSDESC_HEIGHT);
     if (!QDirectFBScreen::initSurfaceDescriptionPixelFormat(&desc, format))
         return 0;
@@ -213,7 +214,6 @@ IDirectFBSurface *QDirectFBScreen::createDFBSurface(const QSize &size,
     return createDFBSurface(desc, options);
 }
 
-
 IDirectFBSurface *QDirectFBScreen::createDFBSurface(DFBSurfaceDescription desc, SurfaceCreationOptions options)
 {
     DFBResult result = DFB_OK;
@@ -247,6 +247,7 @@ IDirectFBSurface *QDirectFBScreen::createDFBSurface(DFBSurfaceDescription desc,
         }
         desc.caps = DFBSurfaceCapabilities(desc.caps & ~DSCAPS_VIDEOONLY);
     }
+
     if (d_ptr->directFBFlags & SystemOnly)
         desc.caps = DFBSurfaceCapabilities(desc.caps | DSCAPS_SYSTEMONLY);
 
@@ -293,14 +294,14 @@ IDirectFBSurface *QDirectFBScreen::copyToDFBSurface(const QImage &img,
 
     IDirectFBSurface *dfbSurface = createDFBSurface(image.size(), pixmapFormat, options);
     if (!dfbSurface) {
-        qWarning("QDirectFBPixmapData::fromImage() Couldn't create surface");
+        qWarning("QDirectFBScreen::copyToDFBSurface() Couldn't create surface");
         return 0;
     }
 
 #ifndef QT_NO_DIRECTFB_PREALLOCATED
     IDirectFBSurface *imgSurface = createDFBSurface(image, DontTrackSurface);
     if (!imgSurface) {
-        qWarning("QDirectFBPixmapData::fromImage()");
+        qWarning("QDirectFBScreen::copyToDFBSurface()");
         QDirectFBScreen::releaseDFBSurface(dfbSurface);
         return 0;
     }
@@ -315,7 +316,7 @@ IDirectFBSurface *QDirectFBScreen::copyToDFBSurface(const QImage &img,
     dfbSurface->SetBlittingFlags(dfbSurface, flags);
     DFBResult result = dfbSurface->Blit(dfbSurface, imgSurface, 0, 0, 0);
     if (result != DFB_OK)
-        DirectFBError("QDirectFBPixmapData::fromImage()", result);
+        DirectFBError("QDirectFBScreen::copyToDFBSurface()", result);
     dfbSurface->ReleaseSource(dfbSurface);
     imgSurface->Release(imgSurface);
 #else // QT_NO_DIRECTFB_PREALLOCATED
@@ -445,6 +446,7 @@ QImage::Format QDirectFBScreen::getImageFormat(IDirectFBSurface *surface)
 DFBSurfaceDescription QDirectFBScreen::getSurfaceDescription(const QImage &image)
 {
     DFBSurfaceDescription description;
+    memset(&description, 0, sizeof(DFBSurfaceDescription));
 
     const DFBSurfacePixelFormat format = getSurfacePixelFormat(image.format());
 
@@ -479,6 +481,7 @@ DFBSurfaceDescription QDirectFBScreen::getSurfaceDescription(const uint *buffer,
                                                              int length)
 {
     DFBSurfaceDescription description;
+    memset(&description, 0, sizeof(DFBSurfaceDescription));
 
     description.flags = DFBSurfaceDescriptionFlags(DSDESC_CAPS
                                                    | DSDESC_WIDTH
@@ -917,6 +920,8 @@ bool QDirectFBScreen::connect(const QString &displaySpec)
         d_ptr->dfb->SetCooperativeLevel(d_ptr->dfb, DFSCL_FULLSCREEN);
 
     DFBSurfaceDescription description;
+    memset(&description, 0, sizeof(DFBSurfaceDescription));
+
     description.flags = DFBSurfaceDescriptionFlags(DSDESC_CAPS);
     if (::setIntOption(displayArgs, QLatin1String("width"), &description.width))
         description.flags = DFBSurfaceDescriptionFlags(description.flags | DSDESC_WIDTH);
diff --git a/src/plugins/iconengines/svgiconengine/qsvgiconengine.cpp b/src/plugins/iconengines/svgiconengine/qsvgiconengine.cpp
index c7249d3..3273513 100644
--- a/src/plugins/iconengines/svgiconengine/qsvgiconengine.cpp
+++ b/src/plugins/iconengines/svgiconengine/qsvgiconengine.cpp
@@ -122,16 +122,10 @@ QSize QSvgIconEngine::actualSize(const QSize &size, QIcon::Mode mode,
             return size;
     }
 
-    QSvgRenderer renderer;
-    d->loadDataForModeAndState(&renderer, mode, state);
-    if (renderer.isValid()) {
-        QSize defaultSize = renderer.defaultSize();
-        if (!defaultSize.isNull())
-            defaultSize.scale(size, Qt::KeepAspectRatio);
-        return defaultSize;
-    } else {
+    QPixmap pm = pixmap(size, mode, state);
+    if (pm.isNull())
         return QSize();
-    }
+    return pm.size();
 }
 
 void QSvgIconEnginePrivate::loadDataForModeAndState(QSvgRenderer *renderer, QIcon::Mode mode, QIcon::State state)
diff --git a/src/sql/drivers/ibase/qsql_ibase.cpp b/src/sql/drivers/ibase/qsql_ibase.cpp
index 6834d9a..4f3d79d 100644
--- a/src/sql/drivers/ibase/qsql_ibase.cpp
+++ b/src/sql/drivers/ibase/qsql_ibase.cpp
@@ -66,8 +66,11 @@ QT_BEGIN_NAMESPACE
 
 enum { QIBaseChunkSize = SHRT_MAX / 2 };
 
-static bool getIBaseError(QString& msg, ISC_STATUS* status, ISC_LONG &sqlcode,
-                          QTextCodec *tc)
+#if defined(FB_API_VER) && FB_API_VER >= 20
+static bool getIBaseError(QString& msg, const ISC_STATUS* status, ISC_LONG &sqlcode, QTextCodec *tc)
+#else
+static bool getIBaseError(QString& msg, ISC_STATUS* status, ISC_LONG &sqlcode, QTextCodec *tc)
+#endif
 {
     if (status[0] != 1 || status[1] <= 0)
         return false;
@@ -75,7 +78,11 @@ static bool getIBaseError(QString& msg, ISC_STATUS* status, ISC_LONG &sqlcode,
     msg.clear();
     sqlcode = isc_sqlcode(status);
     char buf[512];
+#if defined(FB_API_VER) && FB_API_VER >= 20
+    while(fb_interpret(buf, 512, &status)) {
+#else
     while(isc_interprete(buf, &status)) {
+#endif
         if(!msg.isEmpty())
             msg += QLatin1String(" - ");
         if (tc)
diff --git a/src/sql/drivers/mysql/qsql_mysql.cpp b/src/sql/drivers/mysql/qsql_mysql.cpp
index 1f54db7..fbefa0c 100644
--- a/src/sql/drivers/mysql/qsql_mysql.cpp
+++ b/src/sql/drivers/mysql/qsql_mysql.cpp
@@ -163,18 +163,21 @@ static inline QVariant qDateTimeFromString(QString &val)
 #endif
 }
 
-class QMYSQLResultPrivate
+class QMYSQLResultPrivate : public QObject
 {
+    Q_OBJECT
 public:
-    QMYSQLResultPrivate(QMYSQLDriverPrivate* dp) : d(dp), result(0),
+    QMYSQLResultPrivate(const QMYSQLDriver* dp) : driver(dp), result(0),
         rowsAffected(0), hasBlobs(false)
 #if MYSQL_VERSION_ID >= 40108
         , stmt(0), meta(0), inBinds(0), outBinds(0)
 #endif
         , precisionPolicy(QSql::HighPrecision)
-        {}
+        {
+            connect(dp, SIGNAL(destroyed()), this, SLOT(driverDestroyed()));
+        }
 
-    QMYSQLDriverPrivate* d;
+    const QMYSQLDriver* driver;
     MYSQL_RES *result;
     MYSQL_ROW row;
 
@@ -207,6 +210,8 @@ public:
     MYSQL_BIND *outBinds;
 #endif
     QSql::NumericalPrecisionPolicy precisionPolicy;
+private Q_SLOTS:
+    void driverDestroyed() { driver = NULL; }
 };
 
 #ifndef QT_NO_TEXTCODEC
@@ -379,7 +384,7 @@ bool QMYSQLResultPrivate::bindInValues()
 QMYSQLResult::QMYSQLResult(const QMYSQLDriver* db)
 : QSqlResult(db)
 {
-    d = new QMYSQLResultPrivate(db->d);
+    d = new QMYSQLResultPrivate(db);
 }
 
 QMYSQLResult::~QMYSQLResult()
@@ -391,7 +396,7 @@ QMYSQLResult::~QMYSQLResult()
 QVariant QMYSQLResult::handle() const
 {
 #if MYSQL_VERSION_ID >= 40108
-    if(d->d->preparedQuerys)
+    if(d->driver && d->driver->d->preparedQuerys)
         return d->meta ? qVariantFromValue(d->meta) : qVariantFromValue(d->stmt);
     else
 #endif
@@ -406,8 +411,8 @@ void QMYSQLResult::cleanup()
 // must iterate trough leftover result sets from multi-selects or stored procedures
 // if this isn't done subsequent queries will fail with "Commands out of sync"
 #if MYSQL_VERSION_ID >= 40100
-    while (d->d->mysql && mysql_next_result(d->d->mysql) == 0) {
-        MYSQL_RES *res = mysql_store_result(d->d->mysql);
+    while (d->driver && d->driver->d->mysql && mysql_next_result(d->driver->d->mysql) == 0) {
+        MYSQL_RES *res = mysql_store_result(d->driver->d->mysql);
         if (res)
             mysql_free_result(res);
     }
@@ -447,11 +452,14 @@ void QMYSQLResult::cleanup()
     setAt(-1);
     setActive(false);
 
-    d->d->preparedQuerys = d->d->preparedQuerysEnabled;
+    if(d->driver)
+        d->driver->d->preparedQuerys = d->driver->d->preparedQuerysEnabled;
 }
 
 bool QMYSQLResult::fetch(int i)
 {
+    if(!d->driver)
+        return false;
     if (isForwardOnly()) { // fake a forward seek
         if (at() < i) {
             int x = i - at();
@@ -463,7 +471,7 @@ bool QMYSQLResult::fetch(int i)
     }
     if (at() == i)
         return true;
-    if (d->d->preparedQuerys) {
+    if (d->driver->d->preparedQuerys) {
 #if MYSQL_VERSION_ID >= 40108
         mysql_stmt_data_seek(d->stmt, i);
 
@@ -494,7 +502,9 @@ bool QMYSQLResult::fetch(int i)
 
 bool QMYSQLResult::fetchNext()
 {
-    if (d->d->preparedQuerys) {
+    if(!d->driver)
+        return false;
+    if (d->driver->d->preparedQuerys) {
 #if MYSQL_VERSION_ID >= 40108
         if (mysql_stmt_fetch(d->stmt))
             return false;
@@ -512,6 +522,8 @@ bool QMYSQLResult::fetchNext()
 
 bool QMYSQLResult::fetchLast()
 {
+    if(!d->driver)
+        return false;
     if (isForwardOnly()) { // fake this since MySQL can't seek on forward only queries
         bool success = fetchNext(); // did we move at all?
         while (fetchNext()) {};
@@ -519,7 +531,7 @@ bool QMYSQLResult::fetchLast()
     }
 
     my_ulonglong numRows;
-    if (d->d->preparedQuerys) {
+    if (d->driver->d->preparedQuerys) {
 #if MYSQL_VERSION_ID >= 40108
         numRows = mysql_stmt_num_rows(d->stmt);
 #else
@@ -553,15 +565,18 @@ QVariant QMYSQLResult::data(int field)
         return QVariant();
     }
 
+    if (!d->driver)
+        return QVariant();
+
     int fieldLength = 0;
     const QMYSQLResultPrivate::QMyField &f = d->fields.at(field);
     QString val;
-    if (d->d->preparedQuerys) {
+    if (d->driver->d->preparedQuerys) {
         if (f.nullIndicator)
             return QVariant(f.type);
 
         if (f.type != QVariant::ByteArray)
-            val = toUnicode(d->d->tc, f.outField, f.bufLength);
+            val = toUnicode(d->driver->d->tc, f.outField, f.bufLength);
     } else {
         if (d->row[field] == NULL) {
             // NULL value
@@ -569,7 +584,7 @@ QVariant QMYSQLResult::data(int field)
         }
         fieldLength = mysql_fetch_lengths(d->result)[field];
         if (f.type != QVariant::ByteArray)
-            val = toUnicode(d->d->tc, d->row[field], fieldLength);
+            val = toUnicode(d->driver->d->tc, d->row[field], fieldLength);
     }
 
     switch(f.type) {
@@ -614,7 +629,7 @@ QVariant QMYSQLResult::data(int field)
     case QVariant::ByteArray: {
 
         QByteArray ba;
-        if (d->d->preparedQuerys) {
+        if (d->driver->d->preparedQuerys) {
             ba = QByteArray(f.outField, f.bufLength);
         } else {
             ba = QByteArray(d->row[field], fieldLength);
@@ -631,7 +646,7 @@ QVariant QMYSQLResult::data(int field)
 
 bool QMYSQLResult::isNull(int field)
 {
-   if (d->d->preparedQuerys)
+   if (d->driver->d->preparedQuerys)
        return d->fields.at(field).nullIndicator;
    else
        return d->row[field] == NULL;
@@ -639,31 +654,31 @@ bool QMYSQLResult::isNull(int field)
 
 bool QMYSQLResult::reset (const QString& query)
 {
-    if (!driver() || !driver()->isOpen() || driver()->isOpenError())
+    if (!driver() || !driver()->isOpen() || driver()->isOpenError() || !d->driver)
         return false;
 
-    if(d->d->preparedQuerysEnabled && prepare(query)) {
-        d->d->preparedQuerys = true;
+    if(d->driver->d->preparedQuerysEnabled && prepare(query)) {
+        d->driver->d->preparedQuerys = true;
         return exec();
     }
-    d->d->preparedQuerys = false;
+    d->driver->d->preparedQuerys = false;
 
-    const QByteArray encQuery(fromUnicode(d->d->tc, query));
-    if (mysql_real_query(d->d->mysql, encQuery.data(), encQuery.length())) {
+    const QByteArray encQuery(fromUnicode(d->driver->d->tc, query));
+    if (mysql_real_query(d->driver->d->mysql, encQuery.data(), encQuery.length())) {
         setLastError(qMakeError(QCoreApplication::translate("QMYSQLResult", "Unable to execute query"),
-                     QSqlError::StatementError, d->d));
+                     QSqlError::StatementError, d->driver->d));
         return false;
     }
-    d->result = mysql_store_result(d->d->mysql);
-    if (!d->result && mysql_field_count(d->d->mysql) > 0) {
+    d->result = mysql_store_result(d->driver->d->mysql);
+    if (!d->result && mysql_field_count(d->driver->d->mysql) > 0) {
         setLastError(qMakeError(QCoreApplication::translate("QMYSQLResult", "Unable to store result"),
-                    QSqlError::StatementError, d->d));
+                    QSqlError::StatementError, d->driver->d));
         return false;
     }
-    int numFields = mysql_field_count(d->d->mysql);
+    int numFields = mysql_field_count(d->driver->d->mysql);
     setSelect(numFields != 0);
     d->fields.resize(numFields);
-    d->rowsAffected = mysql_affected_rows(d->d->mysql);
+    d->rowsAffected = mysql_affected_rows(d->driver->d->mysql);
     if (isSelect()) {
         for(int i = 0; i < numFields; i++) {
             MYSQL_FIELD* field = mysql_fetch_field_direct(d->result, i);
@@ -677,8 +692,8 @@ bool QMYSQLResult::reset (const QString& query)
 
 int QMYSQLResult::size()
 {
-    if (isSelect())
-        if (d->d->preparedQuerys)
+    if (d->driver && isSelect())
+        if (d->driver->d->preparedQuerys)
 #if MYSQL_VERSION_ID >= 40108
             return mysql_stmt_num_rows(d->stmt);
 #else
@@ -697,17 +712,17 @@ int QMYSQLResult::numRowsAffected()
 
 QVariant QMYSQLResult::lastInsertId() const
 {
-    if (!isActive())
+    if (!isActive() || !d->driver)
         return QVariant();
 
-    if (d->d->preparedQuerys) {
+    if (d->driver->d->preparedQuerys) {
 #if MYSQL_VERSION_ID >= 40108
         quint64 id = mysql_stmt_insert_id(d->stmt);
         if (id)
             return QVariant(id);
 #endif
     } else {
-        quint64 id = mysql_insert_id(d->d->mysql);
+        quint64 id = mysql_insert_id(d->driver->d->mysql);
         if (id)
             return QVariant(id);
     }
@@ -718,20 +733,20 @@ QSqlRecord QMYSQLResult::record() const
 {
     QSqlRecord info;
     MYSQL_RES *res;
-    if (!isActive() || !isSelect())
+    if (!isActive() || !isSelect() || !d->driver)
         return info;
 
 #if MYSQL_VERSION_ID >= 40108
-    res = d->d->preparedQuerys ? d->meta : d->result;
+    res = d->driver->d->preparedQuerys ? d->meta : d->result;
 #else
     res = d->result;
 #endif
 
-    if (!mysql_errno(d->d->mysql)) {
+    if (!mysql_errno(d->driver->d->mysql)) {
         mysql_field_seek(res, 0);
         MYSQL_FIELD* field = mysql_fetch_field(res);
         while(field) {
-            info.append(qToField(field, d->d->tc));
+            info.append(qToField(field, d->driver->d->tc));
             field = mysql_fetch_field(res);
         }
     }
@@ -741,6 +756,8 @@ QSqlRecord QMYSQLResult::record() const
 
 bool QMYSQLResult::nextResult()
 {
+    if(!d->driver)
+        return false;
 #if MYSQL_VERSION_ID >= 40100 
     setAt(-1);
     setActive(false);
@@ -754,26 +771,26 @@ bool QMYSQLResult::nextResult()
         delete[] d->fields[i].outField;
     d->fields.clear();
 
-    int status = mysql_next_result(d->d->mysql);
+    int status = mysql_next_result(d->driver->d->mysql);
     if (status > 0) {
         setLastError(qMakeError(QCoreApplication::translate("QMYSQLResult", "Unable to execute next query"),
-                     QSqlError::StatementError, d->d));
+                     QSqlError::StatementError, d->driver->d));
         return false;
     } else if (status == -1) {
         return false;   // No more result sets
     }
 
-    d->result = mysql_store_result(d->d->mysql);
-    int numFields = mysql_field_count(d->d->mysql);
+    d->result = mysql_store_result(d->driver->d->mysql);
+    int numFields = mysql_field_count(d->driver->d->mysql);
     if (!d->result && numFields > 0) {
         setLastError(qMakeError(QCoreApplication::translate("QMYSQLResult", "Unable to store next result"),
-                     QSqlError::StatementError, d->d));
+                     QSqlError::StatementError, d->driver->d));
         return false;
     }
 
     setSelect(numFields > 0);
     d->fields.resize(numFields);
-    d->rowsAffected = mysql_affected_rows(d->d->mysql);
+    d->rowsAffected = mysql_affected_rows(d->driver->d->mysql);
 
     if (isSelect()) {
         for (int i = 0; i < numFields; i++) {
@@ -833,9 +850,11 @@ static MYSQL_TIME *toMySqlDate(QDate date, QTime time, QVariant::Type type)
 
 bool QMYSQLResult::prepare(const QString& query)
 {
+    if(!d->driver)
+        return false;
 #if MYSQL_VERSION_ID >= 40108
     cleanup();
-    if (!d->d->preparedQuerys)
+    if (!d->driver->d->preparedQuerys)
         return QSqlResult::prepare(query);
 
     int r;
@@ -844,14 +863,14 @@ bool QMYSQLResult::prepare(const QString& query)
         return false;
 
     if (!d->stmt)
-        d->stmt = mysql_stmt_init(d->d->mysql);
+        d->stmt = mysql_stmt_init(d->driver->d->mysql);
     if (!d->stmt) {
         setLastError(qMakeError(QCoreApplication::translate("QMYSQLResult", "Unable to prepare statement"),
-                     QSqlError::StatementError, d->d));
+                     QSqlError::StatementError, d->driver->d));
         return false;
     }
 
-    const QByteArray encQuery(fromUnicode(d->d->tc, query));
+    const QByteArray encQuery(fromUnicode(d->driver->d->tc, query));
     r = mysql_stmt_prepare(d->stmt, encQuery.constData(), encQuery.length());
     if (r != 0) {
         setLastError(qMakeStmtError(QCoreApplication::translate("QMYSQLResult",
@@ -873,7 +892,9 @@ bool QMYSQLResult::prepare(const QString& query)
 
 bool QMYSQLResult::exec()
 {
-    if (!d->d->preparedQuerys)
+    if (!d->driver)
+        return false;
+    if (!d->driver->d->preparedQuerys)
         return QSqlResult::exec();
     if (!d->stmt)
         return false;
@@ -963,7 +984,7 @@ bool QMYSQLResult::exec()
                     break;
                 case QVariant::String:
                 default: {
-                    QByteArray ba = fromUnicode(d->d->tc, val.toString());
+                    QByteArray ba = fromUnicode(d->driver->d->tc, val.toString());
                     stringVector.append(ba);
                     currBind->buffer_type = MYSQL_TYPE_STRING;
                     currBind->buffer = const_cast<char *>(ba.constData());
@@ -1459,3 +1480,5 @@ bool QMYSQLDriver::isIdentifierEscapedImplementation(const QString &identifier,
 }
 
 QT_END_NAMESPACE
+
+#include "qsql_mysql.moc"
\ No newline at end of file
diff --git a/src/sql/kernel/qsqldatabase.cpp b/src/sql/kernel/qsqldatabase.cpp
index 6232452..a270c0e 100644
--- a/src/sql/kernel/qsqldatabase.cpp
+++ b/src/sql/kernel/qsqldatabase.cpp
@@ -378,7 +378,7 @@ void QSqlDatabasePrivate::disable()
     the connection name argument, if you don't pass the connection
     name argument, the default connection is assumed. The following
     snippet shows how to create and open a default connection to a
-    MySQL database:
+    PostgreSQL database:
 
     \snippet doc/src/snippets/sqldatabase/sqldatabase.cpp 0
 
diff --git a/src/testlib/qtestcase.cpp b/src/testlib/qtestcase.cpp
index 8c76c5d..041f2db 100644
--- a/src/testlib/qtestcase.cpp
+++ b/src/testlib/qtestcase.cpp
@@ -1465,8 +1465,12 @@ int QTest::qExec(QObject *testObject, int argc, char **argv)
 
 #if !defined(QT_NO_PROCESS) || !defined(QT_NO_SETTINGS)
     if (QBenchmarkGlobalData::current->createChart) {
-        QString chartLocation = QLibraryInfo::location(QLibraryInfo::BinariesPath) 
-                                 + QLatin1String("/../tools/qtestlib/chart/chart");
+        QString chartLocation = QLibraryInfo::location(QLibraryInfo::BinariesPath);
+#ifdef Q_OS_WIN
+        chartLocation += QLatin1String("/../tools/qtestlib/chart/release/chart.exe");
+#else
+        chartLocation += QLatin1String("/../tools/qtestlib/chart/chart");        
+#endif
         if (QFile::exists(chartLocation)) {
             QProcess p;
             p.setProcessChannelMode(QProcess::ForwardedChannels);