diff -r b72c6db6890b -r 5dc02b23752f tools/assistant/lib/qhelp_global.cpp
--- a/tools/assistant/lib/qhelp_global.cpp	Wed Jun 23 19:07:03 2010 +0300
+++ b/tools/assistant/lib/qhelp_global.cpp	Tue Jul 06 15:10:48 2010 +0300
@@ -39,6 +39,7 @@
 **
 ****************************************************************************/
 
+#include <QtCore/QCoreApplication>
 #include <QtCore/QRegExp>
 #include <QtCore/QMutexLocker>
 #include <QtGui/QTextDocument>
@@ -55,12 +56,12 @@
         counter = 0;
 
     return QString::fromLatin1("%1-%2-%3").
-        arg(name).arg(long(pointer)).arg(counter);
+        arg(name).arg(quintptr(pointer)).arg(counter);
 }
 
 QString QHelpGlobal::documentTitle(const QString &content)
 {
-    QString title = QObject::tr("Untitled");
+    QString title = QCoreApplication::translate("QHelp", "Untitled");
     if (!content.isEmpty()) {
         int start = content.indexOf(QLatin1String("<title>"), 0, Qt::CaseInsensitive) + 7;
         int end = content.indexOf(QLatin1String("</title>"), 0, Qt::CaseInsensitive);
@@ -86,17 +87,18 @@
 
 QString QHelpGlobal::codecFromHtmlData(const QByteArray &data)
 {
-    QString content = QString::fromUtf8(data.constData(), data.size());
-    int start = content.indexOf(QLatin1String("<meta"), 0, Qt::CaseInsensitive);
+    QString head = QString::fromUtf8(data.constData(), qMin(1000, data.size()));
+    int start = head.indexOf(QLatin1String("<meta"), 0, Qt::CaseInsensitive);
     if (start > 0) {
-        int end;
         QRegExp r(QLatin1String("charset=([^\"\\s]+)"));
         while (start != -1) {
-            end = content.indexOf(QLatin1Char('>'), start) + 1;
-            const QString &meta = content.mid(start, end - start).toLower();
+            const int end = head.indexOf(QLatin1Char('>'), start) + 1;
+            if (end <= start)
+                break;
+            const QString &meta = head.mid(start, end - start).toLower();
             if (r.indexIn(meta) != -1)
                 return r.cap(1);
-            start = content.indexOf(QLatin1String("<meta"), end,
+            start = head.indexOf(QLatin1String("<meta"), end,
                                     Qt::CaseInsensitive);
         }
     }
@@ -105,8 +107,8 @@
 
 QString QHelpGlobal::codecFromXmlData(const QByteArray &data)
 {
-    QString content = QString::fromUtf8(data.constData(), data.size());
+    QString head = QString::fromUtf8(data.constData(), qMin(1000, data.size()));
     const QRegExp encodingExp(QLatin1String("^\\s*<\\?xml version="
         "\"\\d\\.\\d\" encoding=\"([^\"]+)\"\\?>.*"));
-    return encodingExp.exactMatch(content) ? encodingExp.cap(1) : QString();
+    return encodingExp.exactMatch(head) ? encodingExp.cap(1) : QString();
 }