Fix some iterator invalidation issues while traversing CPDF_Dictionary.

core/src/fpdfapi/fpdf_page/fpdf_page_parser.cpp

 // Copyright 2014 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.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "core/src/fpdfapi/fpdf_page/pageint.h"
 
 #include "core/include/fpdfapi/fpdf_module.h"
 #include "core/include/fpdfapi/fpdf_page.h"
@@ skipping 478 matching lines @@
     return;
   }
   CFX_ByteString tag = GetString(0);
   m_CurContentMark.GetModify()->AddMark(tag, NULL, FALSE);
 }
 
 void PDF_ReplaceAbbr(CPDF_Object* pObj) {
   switch (pObj->GetType()) {
     case PDFOBJ_DICTIONARY: {
       CPDF_Dictionary* pDict = pObj->AsDictionary();
-      for (const auto& it : *pDict) {
-        CFX_ByteString key = it.first;
-        CPDF_Object* value = it.second;
+      auto it = pDict->begin();
+      while (it != pDict->end()) {
+        auto old_it = it++;
+        CFX_ByteString key = old_it->first;
+        CPDF_Object* value = old_it->second;
         CFX_ByteStringC fullname = PDF_FindFullName(
             PDF_InlineKeyAbbr, FX_ArraySize(PDF_InlineKeyAbbr), key);
         if (!fullname.IsEmpty()) {
           pDict->ReplaceKey(key, fullname);
           key = fullname;
         }
 
         if (value->IsName()) {
           CFX_ByteString name = value->GetString();
           fullname = PDF_FindFullName(PDF_InlineValueAbbr,
@@ skipping 24 matching lines @@
       }
       break;
     }
   }
 }
 
 void PDF_ReplaceFull(CPDF_Object* pObj) {
   switch (pObj->GetType()) {
     case PDFOBJ_DICTIONARY: {
       CPDF_Dictionary* pDict = pObj->AsDictionary();
-      for (const auto& it : *pDict) {
-        CFX_ByteString key = it.first;
-        CPDF_Object* value = it.second;
+      auto it = pDict->begin();
+      while (it != pDict->end()) {
+        auto old_it = it++;
+        CFX_ByteString key = old_it->first;
+        CPDF_Object* value = old_it->second;
         CFX_ByteStringC abbrName = PDF_FindAbbrName(
             PDF_InlineKeyAbbr, FX_ArraySize(PDF_InlineKeyAbbr), key);
         if (!abbrName.IsEmpty()) {
           pDict->ReplaceKey(key, abbrName);
           key = abbrName;
         }
         if (value->IsName()) {
           CFX_ByteString name = value->GetString();
           abbrName = PDF_FindAbbrName(PDF_InlineValueAbbr,
                                       FX_ArraySize(PDF_InlineValueAbbr), name);
@@ skipping 957 matching lines @@
     m_pObjectList->m_ObjectList.AddTail(pPathObj);
   }
   if (PathClipType) {
     if (!matrix.IsIdentity()) {
       Path.Transform(&matrix);
       matrix.SetIdentity();
     }
     m_pCurStates->m_ClipPath.AppendPath(Path, PathClipType, TRUE);
   }
 }