Return unique_ptr<> from IPDF_StructTree

fpdfsdk/fpdf_structtree.cpp

 // Copyright 2016 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "public/fpdf_structtree.h"
 
 #include "core/fpdfapi/page/cpdf_page.h"
 #include "core/fpdfapi/parser/cpdf_dictionary.h"
 #include "core/fpdfdoc/fpdf_tagged.h"
 #include "fpdfsdk/fsdk_define.h"
 
 namespace {
 
 IPDF_StructTree* ToStructTree(FPDF_STRUCTTREE struct_tree) {
   return reinterpret_cast<IPDF_StructTree*>(struct_tree);
 }
 
 IPDF_StructElement* ToStructTreeElement(FPDF_STRUCTELEMENT struct_element) {
   return reinterpret_cast<IPDF_StructElement*>(struct_element);
 }
 
 }  // namespace
 
 DLLEXPORT FPDF_STRUCTTREE STDCALL FPDF_StructTree_GetForPage(FPDF_PAGE page) {
   CPDF_Page* pPage = CPDFPageFromFPDFPage(page);
   if (!pPage)
     return nullptr;
-  return IPDF_StructTree::LoadPage(pPage->m_pDocument, pPage->m_pFormDict);
+  return IPDF_StructTree::LoadPage(pPage->m_pDocument, pPage->m_pFormDict)
+      .release();
 }
 
 DLLEXPORT void STDCALL FPDF_StructTree_Close(FPDF_STRUCTTREE struct_tree) {
   delete ToStructTree(struct_tree);
 }
 
 DLLEXPORT int STDCALL
 FPDF_StructTree_CountChildren(FPDF_STRUCTTREE struct_tree) {
   IPDF_StructTree* tree = ToStructTree(struct_tree);
   return tree ? tree->CountTopElements() : -1;
@@ skipping 40 matching lines @@
 FPDF_StructElement_GetChildAtIndex(FPDF_STRUCTELEMENT struct_element,
                                    int index) {
   IPDF_StructElement* elem = ToStructTreeElement(struct_element);
   if (!elem || index < 0 || index >= elem->CountKids())
     return nullptr;
 
   CPDF_StructKid kid = elem->GetKid(index);
   return kid.m_Type == CPDF_StructKid::Element ? kid.m_Element.m_pElement
                                                : nullptr;
 }