Remove non-const CPDF_PageObjectHolder::GetPageObjectList().

This makes it easier to control modifications to the page object
list.

Bug: pdfium:1051
Change-Id: Ia85c597fa6d39e89041b990b4b6c91e327ef811d
Reviewed-on: https://pdfium-review.googlesource.com/30803
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>

3 files changed, 14 insertions, 6 deletions

diff --git a/core/fpdfapi/page/cpdf_pageobjectholder.cpp b/core/fpdfapi/page/cpdf_pageobjectholder.cpp
index 67b356fc57..310858f7c8 100644
--- a/core/fpdfapi/page/cpdf_pageobjectholder.cpp
+++ b/core/fpdfapi/page/cpdf_pageobjectholder.cpp
@@ -119,3 +119,11 @@ bool CPDF_PageObjectHolder::RemovePageObject(CPDF_PageObject* pPageObj) {
   m_PageObjectList.erase(it);
   return true;
 }
+
+bool CPDF_PageObjectHolder::ErasePageObjectAtIndex(size_t index) {
+  if (index >= m_PageObjectList.size())
+    return false;
+
+  m_PageObjectList.erase(m_PageObjectList.begin() + index);
+  return true;
+}
diff --git a/core/fpdfapi/page/cpdf_pageobjectholder.h b/core/fpdfapi/page/cpdf_pageobjectholder.h
index bf6c476186..a65ccc8129 100644
--- a/core/fpdfapi/page/cpdf_pageobjectholder.h
+++ b/core/fpdfapi/page/cpdf_pageobjectholder.h
@@ -52,7 +52,6 @@ class CPDF_PageObjectHolder {
   void ContinueParse(PauseIndicatorIface* pPause);
   bool IsParsed() const { return m_ParseState == CONTENT_PARSED; }
 
-  CPDF_PageObjectList* GetPageObjectList() { return &m_PageObjectList; }
   const CPDF_PageObjectList* GetPageObjectList() const {
     return &m_PageObjectList;
   }
@@ -61,6 +60,7 @@ class CPDF_PageObjectHolder {
   CPDF_PageObject* GetPageObjectByIndex(size_t index) const;
   void AppendPageObject(std::unique_ptr<CPDF_PageObject> pPageObj);
   bool RemovePageObject(CPDF_PageObject* pPageObj);
+  bool ErasePageObjectAtIndex(size_t index);
 
   const CFX_Matrix& GetLastCTM() const { return m_LastCTM; }
 
diff --git a/core/fpdfapi/page/cpdf_streamcontentparser.cpp b/core/fpdfapi/page/cpdf_streamcontentparser.cpp
index 3b8dac9244..736e91b3c8 100644
--- a/core/fpdfapi/page/cpdf_streamcontentparser.cpp
+++ b/core/fpdfapi/page/cpdf_streamcontentparser.cpp
@@ -793,7 +793,7 @@ void CPDF_StreamContentParser::AddForm(CPDF_Stream* pStream) {
   }
   pFormObj->CalcBoundingBox();
   SetGraphicStates(pFormObj.get(), true, true, true);
-  m_pObjectHolder->GetPageObjectList()->push_back(std::move(pFormObj));
+  m_pObjectHolder->AppendPageObject(std::move(pFormObj));
 }
 
 CPDF_ImageObject* CPDF_StreamContentParser::AddImage(
@@ -836,7 +836,7 @@ CPDF_ImageObject* CPDF_StreamContentParser::AddImageObject(
   pImageObj->CalcBoundingBox();
 
   CPDF_ImageObject* pRet = pImageObj.get();
-  m_pObjectHolder->GetPageObjectList()->push_back(std::move(pImageObj));
+  m_pObjectHolder->AppendPageObject(std::move(pImageObj));
   return pRet;
 }
 
@@ -1095,7 +1095,7 @@ void CPDF_StreamContentParser::Handle_ShadeFill() {
   pObj->m_Right = bbox.right;
   pObj->m_Top = bbox.top;
   pObj->m_Bottom = bbox.bottom;
-  m_pObjectHolder->GetPageObjectList()->push_back(std::move(pObj));
+  m_pObjectHolder->AppendPageObject(std::move(pObj));
 }
 
 void CPDF_StreamContentParser::Handle_SetCharSpace() {
@@ -1242,7 +1242,7 @@ void CPDF_StreamContentParser::AddTextObject(ByteString* pStrs,
       m_ClipTextList.push_back(
           std::unique_ptr<CPDF_TextObject>(pText->Clone()));
     }
-    m_pObjectHolder->GetPageObjectList()->push_back(std::move(pText));
+    m_pObjectHolder->AppendPageObject(std::move(pText));
   }
   if (pKerning && pKerning[nsegs - 1] != 0) {
     if (!pFont->IsVertWriting()) {
@@ -1463,7 +1463,7 @@ void CPDF_StreamContentParser::AddPathObject(int FillType, bool bStroke) {
     pPathObj->m_Matrix = matrix;
     SetGraphicStates(pPathObj.get(), true, false, true);
     pPathObj->CalcBoundingBox();
-    m_pObjectHolder->GetPageObjectList()->push_back(std::move(pPathObj));
+    m_pObjectHolder->AppendPageObject(std::move(pPathObj));
   }
   if (PathClipType) {
     if (!matrix.IsIdentity()) {