Add some more consts to unowned pointers.

Ideally, unowned ptrs might well be const, as updating something
through an unowned reference is best avoided.

Change-Id: Ida8111ffe0ee1e30bbf6b7718b0929dfb5cafdff
Reviewed-on: https://pdfium-review.googlesource.com/36050
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>

14 files changed, 26 insertions, 27 deletions

diff --git a/core/fpdfapi/edit/cpdf_creator.h b/core/fpdfapi/edit/cpdf_creator.h
index 079f1c2666..a7261145e9 100644
--- a/core/fpdfapi/edit/cpdf_creator.h
+++ b/core/fpdfapi/edit/cpdf_creator.h
@@ -77,7 +77,7 @@ class CPDF_Creator {
   CPDF_CryptoHandler* GetCryptoHandler();
 
   UnownedPtr<CPDF_Document> const m_pDocument;
-  UnownedPtr<CPDF_Parser> const m_pParser;
+  UnownedPtr<const CPDF_Parser> const m_pParser;
   UnownedPtr<CPDF_Dictionary> m_pEncryptDict;
   fxcrt::MaybeOwned<CPDF_SecurityHandler> m_pSecurityHandler;
   UnownedPtr<const CPDF_Object> m_pMetadata;
diff --git a/core/fpdfapi/edit/cpdf_pagecontentmanager.cpp b/core/fpdfapi/edit/cpdf_pagecontentmanager.cpp
index 3ba23a88fb..b635144b36 100644
--- a/core/fpdfapi/edit/cpdf_pagecontentmanager.cpp
+++ b/core/fpdfapi/edit/cpdf_pagecontentmanager.cpp
@@ -16,7 +16,7 @@
 #include "core/fpdfapi/parser/cpdf_stream.h"
 
 CPDF_PageContentManager::CPDF_PageContentManager(
-    CPDF_PageObjectHolder* obj_holder)
+    const CPDF_PageObjectHolder* obj_holder)
     : obj_holder_(obj_holder), doc_(obj_holder_->GetDocument()) {
   CPDF_Dictionary* page_dict = obj_holder_->GetDict();
   CPDF_Object* contents_obj = page_dict->GetObjectFor("Contents");
diff --git a/core/fpdfapi/edit/cpdf_pagecontentmanager.h b/core/fpdfapi/edit/cpdf_pagecontentmanager.h
index bad8c7a38c..b49b403a75 100644
--- a/core/fpdfapi/edit/cpdf_pagecontentmanager.h
+++ b/core/fpdfapi/edit/cpdf_pagecontentmanager.h
@@ -18,7 +18,7 @@ class CPDF_PageObjectHolder;
 
 class CPDF_PageContentManager {
  public:
-  explicit CPDF_PageContentManager(CPDF_PageObjectHolder* pObjHolder);
+  explicit CPDF_PageContentManager(const CPDF_PageObjectHolder* pObjHolder);
   ~CPDF_PageContentManager();
 
   // Gets the Content stream at a given index. If Contents is a single stream
@@ -39,7 +39,7 @@ class CPDF_PageContentManager {
   void ExecuteScheduledRemovals();
 
  private:
-  UnownedPtr<CPDF_PageObjectHolder> const obj_holder_;
+  UnownedPtr<const CPDF_PageObjectHolder> const obj_holder_;
   UnownedPtr<CPDF_Document> const doc_;
   UnownedPtr<CPDF_Array> contents_array_;
   UnownedPtr<CPDF_Stream> contents_stream_;
diff --git a/core/fpdfapi/font/cpdf_cidfont.h b/core/fpdfapi/font/cpdf_cidfont.h
index 7d7b33eea8..3ff60b0f67 100644
--- a/core/fpdfapi/font/cpdf_cidfont.h
+++ b/core/fpdfapi/font/cpdf_cidfont.h
@@ -73,7 +73,7 @@ class CPDF_CIDFont : public CPDF_Font {
   wchar_t GetUnicodeFromCharCode(uint32_t charcode) const;
 
   RetainPtr<CPDF_CMap> m_pCMap;
-  UnownedPtr<CPDF_CID2UnicodeMap> m_pCID2UnicodeMap;
+  UnownedPtr<const CPDF_CID2UnicodeMap> m_pCID2UnicodeMap;
   CIDSet m_Charset;
   bool m_bType1;
   bool m_bCIDIsGID;
diff --git a/core/fpdfapi/font/cpdf_tounicodemap.h b/core/fpdfapi/font/cpdf_tounicodemap.h
index 8f70791f97..54984d7f3d 100644
--- a/core/fpdfapi/font/cpdf_tounicodemap.h
+++ b/core/fpdfapi/font/cpdf_tounicodemap.h
@@ -35,7 +35,7 @@ class CPDF_ToUnicodeMap {
   uint32_t GetUnicode();
 
   std::map<uint32_t, uint32_t> m_Map;
-  UnownedPtr<CPDF_CID2UnicodeMap> m_pBaseMap;
+  UnownedPtr<const CPDF_CID2UnicodeMap> m_pBaseMap;
   CFX_WideTextBuf m_MultiCharBuf;
 };
 
diff --git a/core/fpdfapi/page/cpdf_generalstate.cpp b/core/fpdfapi/page/cpdf_generalstate.cpp
index a5b718bfff..2657578ab7 100644
--- a/core/fpdfapi/page/cpdf_generalstate.cpp
+++ b/core/fpdfapi/page/cpdf_generalstate.cpp
@@ -154,7 +154,7 @@ void CPDF_GeneralState::SetSoftMask(CPDF_Object* pObject) {
   m_Ref.GetPrivateCopy()->m_pSoftMask = pObject;
 }
 
-CPDF_Object* CPDF_GeneralState::GetTR() const {
+const CPDF_Object* CPDF_GeneralState::GetTR() const {
   const StateData* pData = m_Ref.GetObject();
   return pData ? pData->m_pTR.Get() : nullptr;
 }
@@ -262,7 +262,6 @@ CFX_Matrix* CPDF_GeneralState::GetMutableMatrix() {
 CPDF_GeneralState::StateData::StateData()
     : m_BlendMode(pdfium::transparency::kNormal),
       m_BlendType(0),
-      m_pSoftMask(nullptr),
       m_StrokeAlpha(1.0),
       m_FillAlpha(1.0f),
       m_pTR(nullptr),
diff --git a/core/fpdfapi/page/cpdf_generalstate.h b/core/fpdfapi/page/cpdf_generalstate.h
index 5d6d5dc552..4a101b99de 100644
--- a/core/fpdfapi/page/cpdf_generalstate.h
+++ b/core/fpdfapi/page/cpdf_generalstate.h
@@ -40,7 +40,7 @@ class CPDF_GeneralState {
   CPDF_Object* GetSoftMask() const;
   void SetSoftMask(CPDF_Object* pObject);
 
-  CPDF_Object* GetTR() const;
+  const CPDF_Object* GetTR() const;
   void SetTR(CPDF_Object* pObject);
 
   RetainPtr<CPDF_TransferFunc> GetTransferFunc() const;
@@ -89,7 +89,7 @@ class CPDF_GeneralState {
     CFX_Matrix m_SMaskMatrix;
     float m_StrokeAlpha;
     float m_FillAlpha;
-    UnownedPtr<CPDF_Object> m_pTR;
+    UnownedPtr<const CPDF_Object> m_pTR;
     RetainPtr<CPDF_TransferFunc> m_pTransferFunc;
     CFX_Matrix m_Matrix;
     int m_RenderIntent;
@@ -99,9 +99,9 @@ class CPDF_GeneralState {
     bool m_StrokeOP;
     bool m_FillOP;
     int m_OPMode;
-    UnownedPtr<CPDF_Object> m_pBG;
-    UnownedPtr<CPDF_Object> m_pUCR;
-    UnownedPtr<CPDF_Object> m_pHT;
+    UnownedPtr<const CPDF_Object> m_pBG;
+    UnownedPtr<const CPDF_Object> m_pUCR;
+    UnownedPtr<const CPDF_Object> m_pHT;
     float m_Flatness;
     float m_Smoothness;
   };
diff --git a/core/fpdfapi/page/cpdf_image.h b/core/fpdfapi/page/cpdf_image.h
index 9281a2c77d..be5883b946 100644
--- a/core/fpdfapi/page/cpdf_image.h
+++ b/core/fpdfapi/page/cpdf_image.h
@@ -29,9 +29,9 @@ class CPDF_Image : public Retainable {
 
   void ConvertStreamToIndirectObject();
 
-  CPDF_Stream* GetStream() const { return m_pStream.Get(); }
   CPDF_Dictionary* GetDict() const;
-  CPDF_Dictionary* GetOC() const { return m_pOC.Get(); }
+  CPDF_Stream* GetStream() const { return m_pStream.Get(); }
+  const CPDF_Dictionary* GetOC() const { return m_pOC.Get(); }
   CPDF_Document* GetDocument() const { return m_pDocument.Get(); }
 
   int32_t GetPixelHeight() const { return m_Height; }
@@ -82,7 +82,7 @@ class CPDF_Image : public Retainable {
   bool m_bInterpolate = false;
   UnownedPtr<CPDF_Document> const m_pDocument;
   MaybeOwned<CPDF_Stream> m_pStream;
-  UnownedPtr<CPDF_Dictionary> m_pOC;
+  UnownedPtr<const CPDF_Dictionary> m_pOC;
 };
 
 #endif  // CORE_FPDFAPI_PAGE_CPDF_IMAGE_H_
diff --git a/core/fpdfapi/page/cpdf_shadingobject.h b/core/fpdfapi/page/cpdf_shadingobject.h
index 69b606749d..af88128443 100644
--- a/core/fpdfapi/page/cpdf_shadingobject.h
+++ b/core/fpdfapi/page/cpdf_shadingobject.h
@@ -33,7 +33,7 @@ class CPDF_ShadingObject : public CPDF_PageObject {
   const CFX_Matrix& matrix() const { return m_Matrix; }
 
  private:
-  UnownedPtr<CPDF_ShadingPattern> m_pShading;
+  UnownedPtr<const CPDF_ShadingPattern> m_pShading;
   CFX_Matrix m_Matrix;
 };
 
diff --git a/core/fpdfapi/page/cpdf_shadingpattern.h b/core/fpdfapi/page/cpdf_shadingpattern.h
index 3c68c818ea..d7aa1cb272 100644
--- a/core/fpdfapi/page/cpdf_shadingpattern.h
+++ b/core/fpdfapi/page/cpdf_shadingpattern.h
@@ -55,7 +55,7 @@ class CPDF_ShadingPattern : public CPDF_Pattern {
   ShadingType GetShadingType() const { return m_ShadingType; }
   bool IsShadingObject() const { return m_bShadingObj; }
   const CPDF_Object* GetShadingObject() const { return m_pShadingObj.Get(); }
-  CPDF_ColorSpace* GetCS() const { return m_pCS.Get(); }
+  const CPDF_ColorSpace* GetCS() const { return m_pCS.Get(); }
   const std::vector<std::unique_ptr<CPDF_Function>>& GetFuncs() const {
     return m_pFunctions;
   }
@@ -73,9 +73,9 @@ class CPDF_ShadingPattern : public CPDF_Pattern {
 
   // Still keep |m_pCS| as some CPDF_ColorSpace (name object) are not managed
   // as counted objects. Refer to CPDF_DocPageData::GetColorSpace.
-  UnownedPtr<CPDF_ColorSpace> m_pCS;
+  UnownedPtr<const CPDF_ColorSpace> m_pCS;
 
-  UnownedPtr<CPDF_CountedColorSpace> m_pCountedCS;
+  UnownedPtr<const CPDF_CountedColorSpace> m_pCountedCS;
   std::vector<std::unique_ptr<CPDF_Function>> m_pFunctions;
 };
 
diff --git a/core/fpdfapi/page/cpdf_streamcontentparser.cpp b/core/fpdfapi/page/cpdf_streamcontentparser.cpp
index 9d6e86def0..8f3e70a278 100644
--- a/core/fpdfapi/page/cpdf_streamcontentparser.cpp
+++ b/core/fpdfapi/page/cpdf_streamcontentparser.cpp
@@ -76,7 +76,7 @@ CFX_FloatRect GetShadingBBox(CPDF_ShadingPattern* pShading,
                              const CFX_Matrix& matrix) {
   ShadingType type = pShading->GetShadingType();
   const CPDF_Stream* pStream = ToStream(pShading->GetShadingObject());
-  CPDF_ColorSpace* pCS = pShading->GetCS();
+  const CPDF_ColorSpace* pCS = pShading->GetCS();
   if (!pStream || !pCS)
     return CFX_FloatRect();
 
diff --git a/core/fpdfapi/parser/cpdf_parser.cpp b/core/fpdfapi/parser/cpdf_parser.cpp
index 854d6e7f60..3a7afd0b49 100644
--- a/core/fpdfapi/parser/cpdf_parser.cpp
+++ b/core/fpdfapi/parser/cpdf_parser.cpp
@@ -1135,11 +1135,11 @@ std::unique_ptr<CPDF_Dictionary> CPDF_Parser::GetCombinedTrailer() const {
   return m_TrailerData->GetCombinedTrailer();
 }
 
-uint32_t CPDF_Parser::GetInfoObjNum() {
+uint32_t CPDF_Parser::GetInfoObjNum() const {
   return m_TrailerData->GetInfoObjNum();
 }
 
-uint32_t CPDF_Parser::GetRootObjNum() {
+uint32_t CPDF_Parser::GetRootObjNum() const {
   return m_TrailerData->GetRootObjNum();
 }
 
diff --git a/core/fpdfapi/parser/cpdf_parser.h b/core/fpdfapi/parser/cpdf_parser.h
index b74f1d52ab..3151da61c9 100644
--- a/core/fpdfapi/parser/cpdf_parser.h
+++ b/core/fpdfapi/parser/cpdf_parser.h
@@ -57,7 +57,7 @@ class CPDF_Parser {
                              CPDF_Document* pDocument);
 
   void SetPassword(const char* password) { m_Password = password; }
-  ByteString GetPassword() { return m_Password; }
+  ByteString GetPassword() const { return m_Password; }
 
   CPDF_Dictionary* GetTrailer() const;
 
@@ -68,8 +68,8 @@ class CPDF_Parser {
   FX_FILESIZE GetLastXRefOffset() const { return m_LastXRefOffset; }
 
   uint32_t GetPermissions() const;
-  uint32_t GetRootObjNum();
-  uint32_t GetInfoObjNum();
+  uint32_t GetRootObjNum() const;
+  uint32_t GetInfoObjNum() const;
   const CPDF_Array* GetIDArray() const;
 
   CPDF_Dictionary* GetEncryptDict() const { return m_pEncryptDict.Get(); }
diff --git a/core/fpdfapi/render/cpdf_imagerenderer.cpp b/core/fpdfapi/render/cpdf_imagerenderer.cpp
index a5e2e27a25..d3e7075cc2 100644
--- a/core/fpdfapi/render/cpdf_imagerenderer.cpp
+++ b/core/fpdfapi/render/cpdf_imagerenderer.cpp
@@ -175,7 +175,7 @@ bool CPDF_ImageRenderer::Start(CPDF_RenderStatus* pStatus,
   m_pImageObject = pImageObject;
   m_BlendType = blendType;
   m_pObj2Device = pObj2Device;
-  CPDF_Dictionary* pOC = m_pImageObject->GetImage()->GetOC();
+  const CPDF_Dictionary* pOC = m_pImageObject->GetImage()->GetOC();
   if (pOC && m_pRenderStatus->GetRenderOptions()->GetOCContext() &&
       !m_pRenderStatus->GetRenderOptions()->GetOCContext()->CheckOCGVisible(
           pOC)) {