QmlPuppet: Fix compile with Qt older than 5.2

Change-Id: I0ef3c5e374b1b01c22b553b99dfbd8eb7783fa90
Reviewed-by: Christian Stenger <christian.stenger@digia.com>
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>

share/qtcreator/qml/qmlpuppet/container/sharedmemory_unix.cpp

@@ -53,6 +53,14 @@
 #define NAME_MAX PSHMNAMLEN
 #endif
 
+#ifndef QStringLiteral
+#define QStringLiteral(str) QString::fromUtf8(str)
+#endif
+
+#if QT_VERSION < QT_VERSION_CHECK(5, 2, 0)
+#include <QRegExp>
+#endif
+
 namespace QmlDesigner {
 
 class SharedMemoryLocker
@@ -94,8 +102,17 @@ static QByteArray makePlatformSafeKey(const QString &key)
 {
     if (key.isEmpty())
         return QByteArray();
+#if QT_VERSION < QT_VERSION_CHECK(5, 2, 0)
+    QByteArray data(QCryptographicHash::hash(key.toLatin1(), QCryptographicHash::Sha1).toBase64());
+    QString ambiguousChars(QStringLiteral("[=~<>|?*!@#$%^&:,; \\\\]"));
 
+    QByteArray normalizedData;
+    normalizedData = QString(data).replace(QRegExp(ambiguousChars), QStringLiteral("_")).toLatin1();
+
+    return normalizedData;
+#else
     return QCryptographicHash::hash(key.toLatin1(), QCryptographicHash::Sha1).toBase64(QByteArray::Base64UrlEncoding | QByteArray::OmitTrailingEquals);
+#endif
 }