1 files changed, 69 insertions, 0 deletions
diff --git a/svl/source/misc/sharedstring.cxx b/svl/source/misc/sharedstring.cxx
new file mode 100644
index 000000000..1bb05c6ac
--- /dev/null
+++ b/svl/source/misc/sharedstring.cxx
@@ -0,0 +1,69 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <svl/sharedstring.hxx>
+
+namespace svl {
+
+/** ref-counting traffic associated with SharedString temporaries can be significant, so use a singleton here, so we can return a const& from getEmptyString */
+static OUString EMPTY(u"");
+const SharedString EMPTY_SHARED_STRING(EMPTY.pData, EMPTY.pData);
+
+const SharedString & SharedString::getEmptyString()
+{
+    // unicode string array for empty string is globally shared in OUString.
+    // Let's take advantage of that.
+    return EMPTY_SHARED_STRING;
+}
+
+SharedString& SharedString::operator= ( const SharedString& r )
+{
+    if(this == &r)
+        return *this;
+
+    if (mpData)
+        rtl_uString_release(mpData);
+    if (mpDataIgnoreCase)
+        rtl_uString_release(mpDataIgnoreCase);
+
+    mpData = r.mpData;
+    mpDataIgnoreCase = r.mpDataIgnoreCase;
+
+    if (mpData)
+        rtl_uString_acquire(mpData);
+    if (mpDataIgnoreCase)
+        rtl_uString_acquire(mpDataIgnoreCase);
+
+    return *this;
+}
+
+bool SharedString::operator== ( const SharedString& r ) const
+{
+    // Compare only the original (not case-folded) string.
+
+    if (mpData == r.mpData)
+        return true;
+
+    if (mpData)
+    {
+        if (!r.mpData)
+            return false;
+
+        if (mpData->length != r.mpData->length)
+            return false;
+
+        return rtl_ustr_reverseCompare_WithLength(mpData->buffer, mpData->length, r.mpData->buffer, r.mpData->length) == 0;
+    }
+
+    return !r.mpData;
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */