Merge branch '4.7' of scm.dev.nokia.troll.no:qt/oslo-staging-1 into 4.7-integration

* '4.7' of scm.dev.nokia.troll.no:qt/oslo-staging-1:
  doc: Added more DITA output to the XML generator
  Usefully convert from QtScript object/array to QVariant
  document QSslSocket::systemCaCertificates() change in changelog
  Implement QIODevice::peek() using read() + ungetBlock().
  Allocate the memory for QtFontSize when count > 1
  doc: Added more DITA output to the XML generator
  Defer allocation of GIF decoding tables/stack.
  Make sure only started gestures can cause cancellations
  Updated JavaScriptCore from /home/khansen/dev/qtwebkit-qtscript-integration to javascriptcore-snapshot-16062010 ( 8b2d3443afca194f8ac50a63151dc9d19a150582 )
  qmake: Fix CONFIG += exceptions_off with the MSVC project generator.
  Fix some kind of race condition while using remote commands.
  Work around ICE in Intel C++ Compiler 11.1.072
  Reduce the memory consumption of QtFontStyle

2 files changed, 23 insertions, 7 deletions

diff --git a/src/corelib/io/qiodevice.cpp b/src/corelib/io/qiodevice.cpp
index 223df9b..d2e4f75 100644
--- a/src/corelib/io/qiodevice.cpp
+++ b/src/corelib/io/qiodevice.cpp
@@ -1476,10 +1476,13 @@ bool QIODevice::getChar(char *c)
 */
 qint64 QIODevice::peek(char *data, qint64 maxSize)
 {
+    Q_D(QIODevice);
     qint64 readBytes = read(data, maxSize);
-    int i = readBytes;
-    while (i > 0)
-        ungetChar(data[i-- - 1]);
+    if (readBytes <= 0)
+        return readBytes;
+
+    d->buffer.ungetBlock(data, readBytes);
+    d->pos -= readBytes;
     return readBytes;
 }
 
@@ -1502,11 +1505,15 @@ qint64 QIODevice::peek(char *data, qint64 maxSize)
 */
 QByteArray QIODevice::peek(qint64 maxSize)
 {
+    Q_D(QIODevice);
     QByteArray result = read(maxSize);
-    int i = result.size();
-    const char *data = result.constData();
-    while (i > 0)
-        ungetChar(data[i-- - 1]);
+
+    if (result.isEmpty())
+        return result;
+
+    d->buffer.ungetBlock(result.constData(), result.size());
+    d->pos -= result.size();
+
     return result;
 }
 
diff --git a/src/corelib/io/qiodevice_p.h b/src/corelib/io/qiodevice_p.h
index 94dadca..225a0b9 100644
--- a/src/corelib/io/qiodevice_p.h
+++ b/src/corelib/io/qiodevice_p.h
@@ -151,6 +151,15 @@ public:
         len++;
         *first = c;
     }
+    void ungetBlock(const char* block, int size) {
+        if ((first - buf) < size) {
+            // underflow, the existing valid data needs to move to the end of the (potentially bigger) buffer
+            makeSpace(len + size, freeSpaceAtStart);
+            memcpy(first - size, block, size);
+        }
+        first -= size;
+        len += size;
+    }
 
 private:
     enum FreeSpacePos {freeSpaceAtStart, freeSpaceAtEnd};