Add type cast definitions for CPDF_Dictionary.

This CL adds ToCPDFDictionary type definitions and updates one file to use
instead of straight casts. I had to fix two places where we'd casted off the
constness of the original pointer.

BUG=pdfium:201
R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1399233003 .

10 files changed, 43 insertions, 49 deletions

diff --git a/fpdfsdk/src/formfiller/FFL_CBA_Fontmap.cpp b/fpdfsdk/src/formfiller/FFL_CBA_Fontmap.cpp
index 3a8853cb24..147a0588cc 100644
--- a/fpdfsdk/src/formfiller/FFL_CBA_Fontmap.cpp
+++ b/fpdfsdk/src/formfiller/FFL_CBA_Fontmap.cpp
@@ -137,11 +137,9 @@ CPDF_Font* CBA_FontMap::FindResFontSameCharset(CPDF_Dictionary* pResDict,
     if (pObj == NULL)
       continue;
 
-    CPDF_Object* pDirect = pObj->GetDirect();
-    if (pDirect == NULL || pDirect->GetType() != PDFOBJ_DICTIONARY)
+    CPDF_Dictionary* pElement = ToDictionary(pObj->GetDirect());
+    if (!pElement)
       continue;
-
-    CPDF_Dictionary* pElement = (CPDF_Dictionary*)pDirect;
     if (pElement->GetString("Type") != "Font")
       continue;
 
@@ -181,7 +179,7 @@ void CBA_FontMap::AddFontToAnnotDict(CPDF_Font* pFont,
 
   // to avoid checkbox and radiobutton
   CPDF_Object* pObject = pAPDict->GetElement(m_sAPType);
-  if (pObject && pObject->GetType() == PDFOBJ_DICTIONARY)
+  if (ToDictionary(pObject))
     return;
 
   CPDF_Stream* pStream = pAPDict->GetStream(m_sAPType);
diff --git a/fpdfsdk/src/formfiller/FFL_Utils.cpp b/fpdfsdk/src/formfiller/FFL_Utils.cpp
index d2ce56ac52..a4463b7242 100644
--- a/fpdfsdk/src/formfiller/FFL_Utils.cpp
+++ b/fpdfsdk/src/formfiller/FFL_Utils.cpp
@@ -51,7 +51,7 @@ FX_BOOL CFFL_Utils::TraceObject(CPDF_Object* pObj) {
     } break;
 
     case PDFOBJ_DICTIONARY: {
-      CPDF_Dictionary* pDict = (CPDF_Dictionary*)pObj;
+      CPDF_Dictionary* pDict = pObj->AsDictionary();
 
       FX_POSITION fPos = pDict->GetStartPos();
       CFX_ByteString csKey;
diff --git a/fpdfsdk/src/fpdf_flatten.cpp b/fpdfsdk/src/fpdf_flatten.cpp
index b2303f36aa..fee93f2663 100644
--- a/fpdfsdk/src/fpdf_flatten.cpp
+++ b/fpdfsdk/src/fpdf_flatten.cpp
@@ -94,11 +94,10 @@ int ParserAnnots(CPDF_Document* pSourceDoc,
 
   FX_DWORD dwSize = pAnnots->GetCount();
   for (int i = 0; i < (int)dwSize; i++) {
-    CPDF_Object* pObj = pAnnots->GetElementValue(i);
-    if (!pObj || pObj->GetType() != PDFOBJ_DICTIONARY)
+    CPDF_Dictionary* pAnnotDic = ToDictionary(pAnnots->GetElementValue(i));
+    if (!pAnnotDic)
       continue;
 
-    CPDF_Dictionary* pAnnotDic = (CPDF_Dictionary*)pObj;
     CFX_ByteString sSubtype = pAnnotDic->GetString("Subtype");
     if (sSubtype == "Popup")
       continue;
diff --git a/fpdfsdk/src/fpdf_transformpage.cpp b/fpdfsdk/src/fpdf_transformpage.cpp
index cdc646ae7e..1e24b68f08 100644
--- a/fpdfsdk/src/fpdf_transformpage.cpp
+++ b/fpdfsdk/src/fpdf_transformpage.cpp
@@ -166,8 +166,8 @@ DLLEXPORT FPDF_BOOL STDCALL FPDFPage_TransFormWithClip(FPDF_PAGE page,
         CPDF_Object* pObj = pPattenDict->GetNextElement(pos, key);
         if (pObj->GetType() == PDFOBJ_REFERENCE)
           pObj = pObj->GetDirect();
-        if (pObj->GetType() == PDFOBJ_DICTIONARY) {
-          pDict = (CPDF_Dictionary*)pObj;
+        if (pObj->IsDictionary()) {
+          pDict = pObj->AsDictionary();
         } else if (pObj->GetType() == PDFOBJ_STREAM) {
           pDict = ((CPDF_Stream*)pObj)->GetDict();
         } else
diff --git a/fpdfsdk/src/fpdfdoc.cpp b/fpdfsdk/src/fpdfdoc.cpp
index b770295604..ad8ef8bea3 100644
--- a/fpdfsdk/src/fpdfdoc.cpp
+++ b/fpdfsdk/src/fpdfdoc.cpp
@@ -56,7 +56,8 @@ FPDFBookmark_GetFirstChild(FPDF_DOCUMENT document, FPDF_BOOKMARK pDict) {
   if (!pDoc)
     return nullptr;
   CPDF_BookmarkTree tree(pDoc);
-  CPDF_Bookmark bookmark = CPDF_Bookmark((CPDF_Dictionary*)pDict);
+  CPDF_Bookmark bookmark =
+      CPDF_Bookmark(ToDictionary(static_cast<CPDF_Object*>(pDict)));
   return tree.GetFirstChild(bookmark).GetDict();
 }
 
@@ -68,7 +69,8 @@ FPDFBookmark_GetNextSibling(FPDF_DOCUMENT document, FPDF_BOOKMARK pDict) {
   if (!pDoc)
     return nullptr;
   CPDF_BookmarkTree tree(pDoc);
-  CPDF_Bookmark bookmark = CPDF_Bookmark((CPDF_Dictionary*)pDict);
+  CPDF_Bookmark bookmark =
+      CPDF_Bookmark(ToDictionary(static_cast<CPDF_Object*>(pDict)));
   return tree.GetNextSibling(bookmark).GetDict();
 }
 
@@ -77,7 +79,7 @@ DLLEXPORT unsigned long STDCALL FPDFBookmark_GetTitle(FPDF_BOOKMARK pDict,
                                                       unsigned long buflen) {
   if (!pDict)
     return 0;
-  CPDF_Bookmark bookmark((CPDF_Dictionary*)pDict);
+  CPDF_Bookmark bookmark(ToDictionary(static_cast<CPDF_Object*>(pDict)));
   CFX_WideString title = bookmark.GetTitle();
   CFX_ByteString encodedTitle = title.UTF16LE_Encode();
   unsigned long len = encodedTitle.GetLength();
@@ -107,7 +109,7 @@ DLLEXPORT FPDF_DEST STDCALL FPDFBookmark_GetDest(FPDF_DOCUMENT document,
   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
   if (!pDoc)
     return nullptr;
-  CPDF_Bookmark bookmark((CPDF_Dictionary*)pDict);
+  CPDF_Bookmark bookmark(ToDictionary(static_cast<CPDF_Object*>(pDict)));
   CPDF_Dest dest = bookmark.GetDest(pDoc);
   if (dest)
     return dest.GetObject();
@@ -122,7 +124,7 @@ DLLEXPORT FPDF_DEST STDCALL FPDFBookmark_GetDest(FPDF_DOCUMENT document,
 DLLEXPORT FPDF_ACTION STDCALL FPDFBookmark_GetAction(FPDF_BOOKMARK pDict) {
   if (!pDict)
     return NULL;
-  CPDF_Bookmark bookmark((CPDF_Dictionary*)pDict);
+  CPDF_Bookmark bookmark(ToDictionary(static_cast<CPDF_Object*>(pDict)));
   return bookmark.GetAction().GetDict();
 }
 
@@ -130,7 +132,7 @@ DLLEXPORT unsigned long STDCALL FPDFAction_GetType(FPDF_ACTION pDict) {
   if (!pDict)
     return PDFACTION_UNSUPPORTED;
 
-  CPDF_Action action((CPDF_Dictionary*)pDict);
+  CPDF_Action action(ToDictionary(static_cast<CPDF_Object*>(pDict)));
   CPDF_Action::ActionType type = action.GetType();
   switch (type) {
     case CPDF_Action::GoTo:
@@ -153,7 +155,7 @@ DLLEXPORT FPDF_DEST STDCALL FPDFAction_GetDest(FPDF_DOCUMENT document,
   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
   if (!pDoc)
     return nullptr;
-  CPDF_Action action((CPDF_Dictionary*)pDict);
+  CPDF_Action action(ToDictionary(static_cast<CPDF_Object*>(pDict)));
   return action.GetDest(pDoc).GetObject();
 }
 
@@ -163,7 +165,7 @@ FPDFAction_GetFilePath(FPDF_ACTION pDict, void* buffer, unsigned long buflen) {
   if (type != PDFACTION_REMOTEGOTO && type != PDFACTION_LAUNCH)
     return 0;
 
-  CPDF_Action action((CPDF_Dictionary*)pDict);
+  CPDF_Action action(ToDictionary(static_cast<CPDF_Object*>(pDict)));
   CFX_ByteString path = action.GetFilePath().UTF8Encode();
   unsigned long len = path.GetLength() + 1;
   if (buffer && buflen >= len)
@@ -180,7 +182,7 @@ DLLEXPORT unsigned long STDCALL FPDFAction_GetURIPath(FPDF_DOCUMENT document,
   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
   if (!pDoc)
     return 0;
-  CPDF_Action action((CPDF_Dictionary*)pDict);
+  CPDF_Action action(ToDictionary(static_cast<CPDF_Object*>(pDict)));
   CFX_ByteString path = action.GetURI(pDoc);
   unsigned long len = path.GetLength() + 1;
   if (buffer && buflen >= len)
@@ -235,7 +237,7 @@ DLLEXPORT FPDF_DEST STDCALL FPDFLink_GetDest(FPDF_DOCUMENT document,
   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
   if (!pDoc)
     return nullptr;
-  CPDF_Link link((CPDF_Dictionary*)pDict);
+  CPDF_Link link(ToDictionary(static_cast<CPDF_Object*>(pDict)));
   FPDF_DEST dest = link.GetDest(pDoc).GetObject();
   if (dest)
     return dest;
@@ -250,7 +252,7 @@ DLLEXPORT FPDF_ACTION STDCALL FPDFLink_GetAction(FPDF_LINK pDict) {
   if (!pDict)
     return nullptr;
 
-  CPDF_Link link((CPDF_Dictionary*)pDict);
+  CPDF_Link link(ToDictionary(static_cast<CPDF_Object*>(pDict)));
   return link.GetAction().GetDict();
 }
 
@@ -266,8 +268,9 @@ DLLEXPORT FPDF_BOOL STDCALL FPDFLink_Enumerate(FPDF_PAGE page,
   if (!pAnnots)
     return FALSE;
   for (int i = *startPos; i < (int)pAnnots->GetCount(); i++) {
-    CPDF_Dictionary* pDict = (CPDF_Dictionary*)pAnnots->GetElementValue(i);
-    if (!pDict || pDict->GetType() != PDFOBJ_DICTIONARY)
+    CPDF_Dictionary* pDict =
+        ToDictionary(static_cast<CPDF_Object*>(pAnnots->GetElementValue(i)));
+    if (!pDict)
       continue;
     if (pDict->GetString(FX_BSTRC("Subtype")).Equal(FX_BSTRC("Link"))) {
       *startPos = i + 1;
@@ -282,7 +285,8 @@ DLLEXPORT FPDF_BOOL STDCALL FPDFLink_GetAnnotRect(FPDF_LINK linkAnnot,
                                                   FS_RECTF* rect) {
   if (!linkAnnot || !rect)
     return FALSE;
-  CPDF_Dictionary* pAnnotDict = (CPDF_Dictionary*)linkAnnot;
+  CPDF_Dictionary* pAnnotDict =
+      ToDictionary(static_cast<CPDF_Object*>(linkAnnot));
   CPDF_Rect rt = pAnnotDict->GetRect(FX_BSTRC("Rect"));
   rect->left = rt.left;
   rect->bottom = rt.bottom;
@@ -294,7 +298,8 @@ DLLEXPORT FPDF_BOOL STDCALL FPDFLink_GetAnnotRect(FPDF_LINK linkAnnot,
 DLLEXPORT int STDCALL FPDFLink_CountQuadPoints(FPDF_LINK linkAnnot) {
   if (!linkAnnot)
     return 0;
-  CPDF_Dictionary* pAnnotDict = (CPDF_Dictionary*)linkAnnot;
+  CPDF_Dictionary* pAnnotDict =
+      ToDictionary(static_cast<CPDF_Object*>(linkAnnot));
   CPDF_Array* pArray = pAnnotDict->GetArray(FX_BSTRC("QuadPoints"));
   if (!pArray)
     return 0;
@@ -306,7 +311,8 @@ DLLEXPORT FPDF_BOOL STDCALL FPDFLink_GetQuadPoints(FPDF_LINK linkAnnot,
                                                    FS_QUADPOINTSF* quadPoints) {
   if (!linkAnnot || !quadPoints)
     return FALSE;
-  CPDF_Dictionary* pAnnotDict = (CPDF_Dictionary*)linkAnnot;
+  CPDF_Dictionary* pAnnotDict =
+      ToDictionary(static_cast<CPDF_Object*>(linkAnnot));
   CPDF_Array* pArray = pAnnotDict->GetArray(FX_BSTRC("QuadPoints"));
   if (pArray) {
     if (quadIndex < 0 || quadIndex >= (int)pArray->GetCount() / 8 ||
diff --git a/fpdfsdk/src/fpdfeditpage.cpp b/fpdfsdk/src/fpdfeditpage.cpp
index f2d13d6ba1..7b70526b0c 100644
--- a/fpdfsdk/src/fpdfeditpage.cpp
+++ b/fpdfsdk/src/fpdfeditpage.cpp
@@ -103,7 +103,7 @@ DLLEXPORT int STDCALL FPDFPage_GetRotation(FPDF_PAGE page) {
     else {
       if (pDict->KeyExist("Parent")) {
         CPDF_Dictionary* pPages =
-            (CPDF_Dictionary*)pDict->GetElement("Parent")->GetDirect();
+            ToDictionary(pDict->GetElement("Parent")->GetDirect());
         while (pPages) {
           if (pPages->KeyExist("Rotate")) {
             rotate =
@@ -113,8 +113,7 @@ DLLEXPORT int STDCALL FPDFPage_GetRotation(FPDF_PAGE page) {
                     : 0;
             break;
           } else if (pPages->KeyExist("Parent"))
-            pPages =
-                (CPDF_Dictionary*)pPages->GetElement("Parent")->GetDirect();
+            pPages = ToDictionary(pPages->GetElement("Parent")->GetDirect());
           else
             break;
         }
@@ -213,7 +212,7 @@ FPDFPageObj_HasTransparency(FPDF_PAGEOBJECT pageObject) {
     return TRUE;
 
   CPDF_Dictionary* pSMaskDict =
-      pGeneralState ? (CPDF_Dictionary*)pGeneralState->m_pSoftMask : NULL;
+      pGeneralState ? ToDictionary(pGeneralState->m_pSoftMask) : NULL;
   if (pSMaskDict)
     return TRUE;
 
diff --git a/fpdfsdk/src/fpdfppo.cpp b/fpdfsdk/src/fpdfppo.cpp
index 2508adca7b..ab25b76934 100644
--- a/fpdfsdk/src/fpdfppo.cpp
+++ b/fpdfsdk/src/fpdfppo.cpp
@@ -60,7 +60,7 @@ FX_BOOL CPDF_PageOrganizer::PDFDocInit(CPDF_Document* pDestPDFDoc,
 
   CPDF_Object* pElement = pNewRoot->GetElement("Pages");
   CPDF_Dictionary* pNewPages =
-      pElement ? (CPDF_Dictionary*)pElement->GetDirect() : nullptr;
+      pElement ? ToDictionary(pElement->GetDirect()) : nullptr;
   if (!pNewPages) {
     pNewPages = new CPDF_Dictionary;
     FX_DWORD NewPagesON = pDestPDFDoc->AddIndirectObject(pNewPages);
@@ -183,14 +183,13 @@ CPDF_Object* CPDF_PageOrganizer::PageDictGetInheritableTag(
   if (pType->GetString().Compare("Page"))
     return nullptr;
 
-  CPDF_Object* pParent = pDict->GetElement("Parent")->GetDirect();
-  if (!pParent || pParent->GetType() != PDFOBJ_DICTIONARY)
+  CPDF_Dictionary* pp = ToDictionary(pDict->GetElement("Parent")->GetDirect());
+  if (!pp)
     return nullptr;
 
   if (pDict->KeyExist((const char*)nSrctag))
     return pDict->GetElement((const char*)nSrctag);
 
-  CPDF_Dictionary* pp = (CPDF_Dictionary*)pParent;
   while (pp) {
     if (pp->KeyExist((const char*)nSrctag)) {
       return pp->GetElement((const char*)nSrctag);
@@ -198,12 +197,8 @@ CPDF_Object* CPDF_PageOrganizer::PageDictGetInheritableTag(
     if (!pp->KeyExist("Parent")) {
       break;
     }
-    pp = (CPDF_Dictionary*)pp->GetElement("Parent")->GetDirect();
-    if (pp->GetType() == PDFOBJ_NULL) {
-      break;
-    }
+    pp = ToDictionary(pp->GetElement("Parent")->GetDirect());
   }
-
   return nullptr;
 }
 
@@ -220,7 +215,7 @@ FX_BOOL CPDF_PageOrganizer::UpdateReference(CPDF_Object* pObj,
       break;
     }
     case PDFOBJ_DICTIONARY: {
-      CPDF_Dictionary* pDict = (CPDF_Dictionary*)pObj;
+      CPDF_Dictionary* pDict = pObj->AsDictionary();
 
       FX_POSITION pos = pDict->GetStartPos();
       while (pos) {
@@ -291,8 +286,7 @@ FX_DWORD CPDF_PageOrganizer::GetNewObjId(CPDF_Document* pDoc,
   if (!pClone)
     return 0;
 
-  if (pClone->GetType() == PDFOBJ_DICTIONARY) {
-    CPDF_Dictionary* pDictClone = (CPDF_Dictionary*)pClone;
+  if (CPDF_Dictionary* pDictClone = pClone->AsDictionary()) {
     if (pDictClone->KeyExist("Type")) {
       CFX_ByteString strType = pDictClone->GetString("Type");
       if (!FXSYS_stricmp(strType, "Pages")) {
diff --git a/fpdfsdk/src/fpdfview.cpp b/fpdfsdk/src/fpdfview.cpp
index 19faea5cc9..0d6dcf29f1 100644
--- a/fpdfsdk/src/fpdfview.cpp
+++ b/fpdfsdk/src/fpdfview.cpp
@@ -882,8 +882,8 @@ DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDest(FPDF_DOCUMENT document,
   }
   if (!pDestObj)
     return NULL;
-  if (pDestObj->GetType() == PDFOBJ_DICTIONARY) {
-    pDestObj = ((CPDF_Dictionary*)pDestObj)->GetArray(FX_BSTRC("D"));
+  if (CPDF_Dictionary* pDict = pDestObj->AsDictionary()) {
+    pDestObj = pDict->GetArray(FX_BSTRC("D"));
     if (!pDestObj)
       return NULL;
   }
diff --git a/fpdfsdk/src/fsdk_baseform.cpp b/fpdfsdk/src/fsdk_baseform.cpp
index 7d0346c797..b4aa822bb6 100644
--- a/fpdfsdk/src/fsdk_baseform.cpp
+++ b/fpdfsdk/src/fsdk_baseform.cpp
@@ -65,8 +65,7 @@ FX_BOOL CPDFSDK_Widget::IsWidgetAppearanceValid(
       return psub->GetType() == PDFOBJ_STREAM;
     case FIELDTYPE_CHECKBOX:
     case FIELDTYPE_RADIOBUTTON:
-      if (psub->GetType() == PDFOBJ_DICTIONARY) {
-        CPDF_Dictionary* pSubDict = (CPDF_Dictionary*)psub;
+      if (CPDF_Dictionary* pSubDict = psub->AsDictionary()) {
         return pSubDict->GetStream(GetAppState()) != NULL;
       }
       return FALSE;
diff --git a/fpdfsdk/src/fsdk_mgr.cpp b/fpdfsdk/src/fsdk_mgr.cpp
index 883ad60a93..4cf05a2d79 100644
--- a/fpdfsdk/src/fsdk_mgr.cpp
+++ b/fpdfsdk/src/fsdk_mgr.cpp
@@ -480,8 +480,7 @@ FX_BOOL CPDFSDK_Document::ProcOpenAction() {
   if (pOpenAction->GetType() == PDFOBJ_ARRAY)
     return TRUE;
 
-  if (pOpenAction->GetType() == PDFOBJ_DICTIONARY) {
-    CPDF_Dictionary* pDict = (CPDF_Dictionary*)pOpenAction;
+  if (CPDF_Dictionary* pDict = pOpenAction->AsDictionary()) {
     CPDF_Action action(pDict);
     if (m_pEnv->GetActionHander())
       m_pEnv->GetActionHander()->DoAction_DocOpen(action, this);