Get rid of most instance of 'foo == NULL'

core/src/fpdfdoc/doc_basic.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/include/fpdfdoc/fpdf_doc.h"
 
 const int nMaxRecursion = 32;
 int CPDF_Dest::GetPageIndex(CPDF_Document* pDoc) {
@@ skipping 94 matching lines @@
       } else {
         break;
       }
       nIndex += i;
       return pNames->GetElementValue(i * 2 + 1);
     }
     nIndex += dwCount;
     return NULL;
   }
   CPDF_Array* pKids = pNode->GetArray("Kids");
-  if (pKids == NULL) {
+  if (!pKids) {
     return NULL;
   }
   for (FX_DWORD i = 0; i < pKids->GetCount(); i++) {
     CPDF_Dictionary* pKid = pKids->GetDict(i);
-    if (pKid == NULL) {
+    if (!pKid) {
       continue;
     }
     CPDF_Object* pFound =
         SearchNameNode(pKid, csName, nIndex, ppFind, nLevel + 1);
     if (pFound) {
       return pFound;
     }
   }
   return NULL;
 }
@@ skipping 13 matching lines @@
       nCurIndex += nCount;
       return NULL;
     }
     if (ppFind) {
       *ppFind = pNames;
     }
     csName = pNames->GetString((nIndex - nCurIndex) * 2);
     return pNames->GetElementValue((nIndex - nCurIndex) * 2 + 1);
   }
   CPDF_Array* pKids = pNode->GetArray("Kids");
-  if (pKids == NULL) {
+  if (!pKids) {
     return NULL;
   }
   for (FX_DWORD i = 0; i < pKids->GetCount(); i++) {
     CPDF_Dictionary* pKid = pKids->GetDict(i);
-    if (pKid == NULL) {
+    if (!pKid) {
       continue;
     }
     CPDF_Object* pFound =
         SearchNameNode(pKid, nIndex, nCurIndex, csName, ppFind, nLevel + 1);
     if (pFound) {
       return pFound;
     }
   }
   return NULL;
 }
 static int CountNames(CPDF_Dictionary* pNode, int nLevel = 0) {
   if (nLevel > nMaxRecursion) {
     return 0;
   }
   CPDF_Array* pNames = pNode->GetArray("Names");
   if (pNames) {
     return pNames->GetCount() / 2;
   }
   CPDF_Array* pKids = pNode->GetArray("Kids");
-  if (pKids == NULL) {
+  if (!pKids) {
     return 0;
   }
   int nCount = 0;
   for (FX_DWORD i = 0; i < pKids->GetCount(); i++) {
     CPDF_Dictionary* pKid = pKids->GetDict(i);
-    if (pKid == NULL) {
+    if (!pKid) {
       continue;
     }
     nCount += CountNames(pKid, nLevel + 1);
   }
   return nCount;
 }
 int CPDF_NameTree::GetCount() const {
-  if (m_pRoot == NULL) {
+  if (!m_pRoot) {
     return 0;
   }
   return ::CountNames(m_pRoot);
 }
 int CPDF_NameTree::GetIndex(const CFX_ByteString& csName) const {
-  if (m_pRoot == NULL) {
+  if (!m_pRoot) {
     return -1;
   }
   int nIndex = 0;
-  if (SearchNameNode(m_pRoot, csName, nIndex, NULL) == NULL) {
+  if (!SearchNameNode(m_pRoot, csName, nIndex, NULL)) {
     return -1;
   }
   return nIndex;
 }
 CPDF_Object* CPDF_NameTree::LookupValue(int nIndex,
                                         CFX_ByteString& csName) const {
-  if (m_pRoot == NULL) {
+  if (!m_pRoot) {
     return NULL;
   }
   int nCurIndex = 0;
   return SearchNameNode(m_pRoot, nIndex, nCurIndex, csName, NULL);
 }
 CPDF_Object* CPDF_NameTree::LookupValue(const CFX_ByteString& csName) const {
-  if (m_pRoot == NULL) {
+  if (!m_pRoot) {
     return NULL;
   }
   int nIndex = 0;
   return SearchNameNode(m_pRoot, csName, nIndex, NULL);
 }
 CPDF_Array* CPDF_NameTree::LookupNamedDest(CPDF_Document* pDoc,
                                            const CFX_ByteStringC& sName) {
   CPDF_Object* pValue = LookupValue(sName);
   if (!pValue) {
     CPDF_Dictionary* pDests = pDoc->GetRoot()->GetDict("Dests");
@@ skipping 235 matching lines @@
   } else if (bsStyle == "A") {
     wsNumPortion = _MakeLetters(num);
     wsNumPortion.MakeUpper();
   } else if (bsStyle == "a") {
     wsNumPortion = _MakeLetters(num);
   }
   return wsNumPortion;
 }
 CFX_WideString CPDF_PageLabel::GetLabel(int nPage) const {
   CFX_WideString wsLabel;
-  if (m_pDocument == NULL) {
+  if (!m_pDocument) {
     return wsLabel;
   }
   CPDF_Dictionary* pPDFRoot = m_pDocument->GetRoot();
-  if (pPDFRoot == NULL) {
+  if (!pPDFRoot) {
     return wsLabel;
   }
   CPDF_Dictionary* pLabels = pPDFRoot->GetDict("PageLabels");
   CPDF_NumberTree numberTree(pLabels);
   CPDF_Object* pValue = NULL;
   int n = nPage;
   while (n >= 0) {
     pValue = numberTree.LookupValue(n);
     if (pValue) {
       break;
@@ skipping 11 matching lines @@
       CFX_WideString wsNumPortion =
           _GetLabelNumPortion(nLabelNum, bsNumberingStyle);
       wsLabel += wsNumPortion;
       return wsLabel;
     }
   }
   wsLabel.Format(L"%d", nPage + 1);
   return wsLabel;
 }
 int32_t CPDF_PageLabel::GetPageByLabel(const CFX_ByteStringC& bsLabel) const {
-  if (m_pDocument == NULL) {
+  if (!m_pDocument) {
     return -1;
   }
   CPDF_Dictionary* pPDFRoot = m_pDocument->GetRoot();
-  if (pPDFRoot == NULL) {
+  if (!pPDFRoot) {
     return -1;
   }
   int nPages = m_pDocument->GetPageCount();
   CFX_ByteString bsLbl;
   CFX_ByteString bsOrig = bsLabel;
   for (int i = 0; i < nPages; i++) {
     bsLbl = PDF_EncodeText(GetLabel(i));
     if (!bsLbl.Compare(bsOrig)) {
       return i;
     }
   }
   bsLbl = bsOrig;
   int nPage = FXSYS_atoi(bsLbl);
   if (nPage > 0 && nPage <= nPages) {
     return nPage;
   }
   return -1;
 }
 int32_t CPDF_PageLabel::GetPageByLabel(const CFX_WideStringC& wsLabel) const {
   CFX_ByteString bsLabel = PDF_EncodeText(wsLabel.GetPtr());
   return GetPageByLabel(bsLabel);
 }