symbian - search drives for translation files

Qt may be installed on a different drive from the application,
particularly the case when Qt is included in ROM (Z:) and the
application is on C:

With this change, if QTranslator::load() specifies an absolute
directory in the filesystem (e.g. "/resource/qt/translations") without
a drive letter, then the symbian search paths are used.
Note that this example path is the one returned by QLibraryInfo so
applications using the example code from
http://doc.qt.nokia.com/latest/internationalization.html#produce-translations
will work as expected.

Task-number: QT-5246
Reviewed-by: mread

Author: Shane Kearns

src/corelib/kernel/qtranslator.cpp

@@ -50,6 +50,7 @@
 #include "qcoreapplication.h"
 #include "qcoreapplication_p.h"
 #include "qdatastream.h"
+#include "qdir.h"
 #include "qfile.h"
 #include "qmap.h"
 #include "qalgorithms.h"
@@ -61,6 +62,10 @@
 #include "private/qcore_unix_p.h"
 #endif
 
+#ifdef Q_OS_SYMBIAN
+#include "private/qcore_symbian_p.h"
+#endif
+
 // most of the headers below are already included in qplatformdefs.h
 // also this lacks Large File support but that's probably irrelevant
 #if defined(QT_USE_MMAP)
@@ -402,11 +407,24 @@ bool QTranslator::load(const QString & filename, const QString & directory,
 
     QString prefix;
     if (QFileInfo(filename).isRelative()) {
+#ifdef Q_OS_SYMBIAN
+        if(directory.isEmpty())
+            prefix = QCoreApplication::applicationDirPath();
+        else
+            prefix = QFileInfo(directory).absoluteFilePath(); //TFindFile doesn't like dirty paths
+        if (prefix.length() > 2 && prefix.at(1) == QLatin1Char(':') && prefix.at(0).isLetter())
+            prefix[0] = QLatin1Char('Y');
+#else
         prefix = directory;
-	if (prefix.length() && !prefix.endsWith(QLatin1Char('/')))
-	    prefix += QLatin1Char('/');
+#endif
+        if (prefix.length() && !prefix.endsWith(QLatin1Char('/')))
+            prefix += QLatin1Char('/');
     }
 
+#ifdef Q_OS_SYMBIAN
+    QString nativePrefix = QDir::toNativeSeparators(prefix);
+#endif
+
     QString fname = filename;
     QString realname;
     QString delims;
@@ -415,6 +433,24 @@ bool QTranslator::load(const QString & filename, const QString & directory,
     for (;;) {
         QFileInfo fi;
 
+#ifdef Q_OS_SYMBIAN
+        //search for translations on other drives, e.g. Qt may be in Z, while app is in C
+        //note this uses symbian search rules, i.e. y:->a:, followed by z:
+        TFindFile finder(qt_s60GetRFs());
+        QString fname2 = fname + (suffix.isNull() ? QString::fromLatin1(".qm") : suffix);
+        TInt err = finder.FindByDir(
+            qt_QString2TPtrC(fname2),
+            qt_QString2TPtrC(nativePrefix));
+        if (err != KErrNone)
+            err = finder.FindByDir(qt_QString2TPtrC(fname), qt_QString2TPtrC(nativePrefix));
+        if (err == KErrNone) {
+            fi.setFile(qt_TDesC2QString(finder.File()));
+            realname = fi.canonicalFilePath();
+            if (fi.isReadable() && fi.isFile())
+                break;
+        }
+#endif
+
         realname = prefix + fname + (suffix.isNull() ? QString::fromLatin1(".qm") : suffix);
         fi.setFile(realname);
         if (fi.isReadable() && fi.isFile())