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

core/src/fpdfapi/fpdf_page/fpdf_page_parser_old.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 "pageint.h"
 
 #include <limits.h>
 
@@ skipping 231 matching lines @@
   m_pLastObj = NULL;
 }
 CPDF_StreamParser::~CPDF_StreamParser() {
   if (m_pLastObj) {
     m_pLastObj->Release();
   }
 }
 FX_DWORD _DecodeAllScanlines(ICodec_ScanlineDecoder* pDecoder,
                              uint8_t*& dest_buf,
                              FX_DWORD& dest_size) {
-  if (pDecoder == NULL) {
+  if (!pDecoder) {
     return (FX_DWORD)-1;
   }
   int ncomps = pDecoder->CountComps();
   int bpc = pDecoder->GetBPC();
   int width = pDecoder->GetWidth();
   int height = pDecoder->GetHeight();
   int pitch = (width * ncomps * bpc + 7) / 8;
   if (height == 0 || pitch > (1 << 30) / height) {
     delete pDecoder;
     return -1;
@@ skipping 83 matching lines @@
       pParam = pDict->GetDict("DecodeParms");
     }
   }
   FX_DWORD width = pDict->GetInteger("Width");
   FX_DWORD height = pDict->GetInteger("Height");
   FX_DWORD OrigSize = 0;
   if (pCSObj) {
     FX_DWORD bpc = pDict->GetInteger("BitsPerComponent");
     FX_DWORD nComponents = 1;
     CPDF_ColorSpace* pCS = pDoc->LoadColorSpace(pCSObj);
-    if (pCS == NULL) {
+    if (!pCS) {
       nComponents = 3;
     } else {
       nComponents = pCS->CountComponents();
       pDoc->GetPageData()->ReleaseColorSpace(pCSObj);
     }
     FX_DWORD pitch = width;
     if (bpc && pitch > INT_MAX / bpc) {
       return NULL;
     }
     pitch *= bpc;
@@ skipping 260 matching lines @@
       if (m_WordSize == 2 && m_WordBuffer[0] == '>') {
         break;
       }
       if (m_WordBuffer[0] != '/') {
         pDict->Release();
         return NULL;
       }
       CFX_ByteString key =
           PDF_NameDecode(CFX_ByteStringC(m_WordBuffer + 1, m_WordSize - 1));
       CPDF_Object* pObj = ReadNextObject(TRUE);
-      if (pObj == NULL) {
+      if (!pObj) {
         if (pDict) {
           pDict->Release();
         }
         return NULL;
       }
       if (!key.IsEmpty()) {
         pDict->SetAt(key, pObj);
       } else {
         pObj->Release();
       }
     }
     return pDict;
   }
   if (first_char == '[') {
     if (!bAllowNestedArray && bInArray) {
       return NULL;
     }
     CPDF_Array* pArray = CPDF_Array::Create();
     while (1) {
       CPDF_Object* pObj = ReadNextObject(bAllowNestedArray, TRUE);
-      if (pObj == NULL) {
+      if (!pObj) {
         if (m_WordSize == 0 || m_WordBuffer[0] == ']') {
           return pArray;
         }
         if (m_WordBuffer[0] == '[') {
           continue;
         }
       } else {
         pArray->Add(pObj);
       }
     }
@@ skipping 248 matching lines @@
   }
   if (!m_pSingleStream)
     FX_Free(m_pData);
   m_pParser = NULL;
   m_pStreamArray = NULL;
   m_pSingleStream = NULL;
   m_pData = NULL;
   m_Status = Ready;
 }
 void CPDF_ContentParser::Start(CPDF_Page* pPage, CPDF_ParseOptions* pOptions) {
-  if (m_Status != Ready || pPage == NULL || pPage->m_pDocument == NULL ||
-      pPage->m_pFormDict == NULL) {
+  if (m_Status != Ready || !pPage || !pPage->m_pDocument ||
+      !pPage->m_pFormDict) {
     m_Status = Done;
     return;
   }
   m_pObjects = pPage;
   m_bForm = FALSE;
   if (pOptions) {
     m_Options = *pOptions;
   }
   m_Status = ToBeContinued;
   m_InternalStage = PAGEPARSE_STAGE_GETCONTENT;
   m_CurrentOffset = 0;
   CPDF_Object* pContent = pPage->m_pFormDict->GetElementValue("Contents");
-  if (pContent == NULL) {
+  if (!pContent) {
     m_Status = Done;
     return;
   }
   if (CPDF_Stream* pStream = pContent->AsStream()) {
     m_nStreams = 0;
     m_pSingleStream = new CPDF_StreamAcc;
     m_pSingleStream->LoadAllData(pStream, FALSE);
   } else if (CPDF_Array* pArray = pContent->AsArray()) {
     m_nStreams = pArray->GetCount();
     if (m_nStreams == 0) {
@@ skipping 168 matching lines @@
       }
       m_Status = Done;
       return;
     }
     steps++;
     if (pPause && pPause->NeedToPauseNow()) {
       break;
     }
   }
 }