fix leaks when using tools::JsonWriter

Specifically in sd/source/core/annotations/Annotation.cxx

We seem to end up fixing leaks here often.
The current tools::JsonWriter API is just very hard to use correctly.

So rather return an OString, which is cheap to copy,
and push that down into the LOK code.

AFAIK that seems to end up requiring less code and less adhoc copying
of data (specifically the queueing code in init.cxx was creating
copies when converting to std::string).

Ideally, we could have some special API to avoid the new strdup()
calls in init.cxx, but not sure how to prevent other people
from accidentally using that.

Change-Id: Ia33437c1bfd9cc2d54dfb99914d1b72db20335f2
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/149963
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

1 files changed, 7 insertions, 8 deletions

diff --git a/vcl/jsdialog/jsdialogbuilder.cxx b/vcl/jsdialog/jsdialogbuilder.cxx
index 39da090326e9..a55242ffae58 100644
--- a/vcl/jsdialog/jsdialogbuilder.cxx
+++ b/vcl/jsdialog/jsdialogbuilder.cxx
@@ -71,7 +71,7 @@ void JSDialogNotifyIdle::send(tools::JsonWriter& aJsonWriter)
 {
     if (!m_aNotifierWindow)
     {
-        free(aJsonWriter.extractData());
+        aJsonWriter.finishAndGetAsOString();
         return;
     }
 
@@ -81,18 +81,17 @@ void JSDialogNotifyIdle::send(tools::JsonWriter& aJsonWriter)
         if (m_bForce || !aJsonWriter.isDataEquals(m_LastNotificationMessage))
         {
             m_bForce = false;
-            m_LastNotificationMessage = aJsonWriter.extractAsStdString();
-            pNotifier->libreOfficeKitViewCallback(LOK_CALLBACK_JSDIALOG,
-                                                  m_LastNotificationMessage.c_str());
+            m_LastNotificationMessage = aJsonWriter.finishAndGetAsOString();
+            pNotifier->libreOfficeKitViewCallback(LOK_CALLBACK_JSDIALOG, m_LastNotificationMessage);
         }
         else
         {
-            free(aJsonWriter.extractData());
+            aJsonWriter.finishAndGetAsOString();
         }
     }
     else
     {
-        free(aJsonWriter.extractData());
+        aJsonWriter.finishAndGetAsOString();
     }
 }
 
@@ -1276,8 +1275,8 @@ JSInstanceBuilder::CreateMessageDialog(weld::Widget* pParent, VclMessageType eMe
         xMessageDialog->DumpAsPropertyTree(aJsonWriter);
         aJsonWriter.put("id", xMessageDialog->GetLOKWindowId());
         aJsonWriter.put("jsontype", "dialog");
-        std::unique_ptr<char[], o3tl::free_delete> message(aJsonWriter.extractData());
-        pNotifier->libreOfficeKitViewCallback(LOK_CALLBACK_JSDIALOG, message.get());
+        OString message(aJsonWriter.finishAndGetAsOString());
+        pNotifier->libreOfficeKitViewCallback(LOK_CALLBACK_JSDIALOG, message);
 
         OUString sWindowId = OUString::number(xMessageDialog->GetLOKWindowId());
         InsertWindowToMap(sWindowId);