sfx2 store: create temp files next to local files (storage case)

This is similar to commit 5259ab81 (sfx2
store: create temp files next to local files, 2018-01-08), except there
only the stream case was handled (e.g. sw HTML export), while this is
the storage case (e.g. ODT export).

Change-Id: I88d78aa0f09e9fdfdd27cd0fad1a2633ff54d576
Reviewed-on: https://gerrit.libreoffice.org/48071Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>

sfx2/source/doc/docfile.cxx

@@ -3398,19 +3398,13 @@ bool SfxMedium::SetWritableForUserOnly( const OUString& aURL )
     return bResult;
 }
 
-
-void SfxMedium::CreateTempFile( bool bReplace )
+namespace
+{
+/// Get the parent directory of a temporary file for output purposes.
+OUString GetLogicBase(std::unique_ptr<SfxMedium_Impl>& pImpl)
 {
-    if ( pImpl->pTempFile )
-    {
-        if ( !bReplace )
-            return;
-
-        DELETEZ( pImpl->pTempFile );
-        pImpl->m_aName.clear();
-    }
-
     OUString aLogicBase;
+
     if (comphelper::isFileUrl(pImpl->m_aLogicName) && !pImpl->m_pInStream)
     {
         // Try to create the temp file in the same directory when storing.
@@ -3421,6 +3415,23 @@ void SfxMedium::CreateTempFile( bool bReplace )
             // Doesn't make sense.
             aLogicBase.clear();
     }
+
+    return aLogicBase;
+}
+}
+
+void SfxMedium::CreateTempFile( bool bReplace )
+{
+    if ( pImpl->pTempFile )
+    {
+        if ( !bReplace )
+            return;
+
+        DELETEZ( pImpl->pTempFile );
+        pImpl->m_aName.clear();
+    }
+
+    OUString aLogicBase = GetLogicBase(pImpl);
     pImpl->pTempFile = new ::utl::TempFile(aLogicBase.isEmpty() ? nullptr : &aLogicBase);
     pImpl->pTempFile->EnableKillingFile();
     pImpl->m_aName = pImpl->pTempFile->GetFileName();
@@ -3519,7 +3530,8 @@ void SfxMedium::CreateTempFileNoCopy()
     // this call always replaces the existing temporary file
     delete pImpl->pTempFile;
 
-    pImpl->pTempFile = new ::utl::TempFile();
+    OUString aLogicBase = GetLogicBase(pImpl);
+    pImpl->pTempFile = new ::utl::TempFile(aLogicBase.isEmpty() ? nullptr : &aLogicBase);
     pImpl->pTempFile->EnableKillingFile();
     pImpl->m_aName = pImpl->pTempFile->GetFileName();
     if ( pImpl->m_aName.isEmpty() )