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

core/src/fpdfapi/fpdf_parser/fpdf_parser_utility.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/fpdfapi/fpdf_parser.h"
 #include "core/include/fxcrt/fx_ext.h"
 
 // Indexed by 8-bit character code, contains either:
@@ skipping 266 matching lines @@
       FX_Free(pBuf);
       return TRUE;
     }
   }
   return FALSE;
 }
 
 CFX_ByteString PDF_NameDecode(const CFX_ByteStringC& bstr) {
   int size = bstr.GetLength();
   const FX_CHAR* pSrc = bstr.GetCStr();
-  if (FXSYS_memchr(pSrc, '#', size) == NULL) {
+  if (!FXSYS_memchr(pSrc, '#', size)) {
     return bstr;
   }
   CFX_ByteString result;
   FX_CHAR* pDestStart = result.GetBuffer(size);
   FX_CHAR* pDest = pDestStart;
   for (int i = 0; i < size; i++) {
     if (pSrc[i] == '#' && i < size - 2) {
       *pDest++ =
           FXSYS_toHexDigit(pSrc[i + 1]) * 16 + FXSYS_toHexDigit(pSrc[i + 2]);
       i += 2;
     } else {
       *pDest++ = pSrc[i];
     }
   }
   result.ReleaseBuffer((FX_STRSIZE)(pDest - pDestStart));
   return result;
 }
 CFX_ByteString PDF_NameDecode(const CFX_ByteString& orig) {
-  if (FXSYS_memchr(orig.c_str(), '#', orig.GetLength()) == NULL) {
+  if (!FXSYS_memchr(orig.c_str(), '#', orig.GetLength())) {
     return orig;
   }
   return PDF_NameDecode(CFX_ByteStringC(orig));
 }
 CFX_ByteString PDF_NameEncode(const CFX_ByteString& orig) {
   uint8_t* src_buf = (uint8_t*)orig.c_str();
   int src_len = orig.GetLength();
   int dest_len = 0;
   int i;
   for (i = 0; i < src_len; i++) {
@@ skipping 20 matching lines @@
       dest_buf[dest_len++] = "0123456789ABCDEF"[ch % 16];
     } else {
       dest_buf[dest_len++] = ch;
     }
   }
   dest_buf[dest_len] = 0;
   res.ReleaseBuffer();
   return res;
 }
 CFX_ByteTextBuf& operator<<(CFX_ByteTextBuf& buf, const CPDF_Object* pObj) {
-  if (pObj == NULL) {
+  if (!pObj) {
     buf << " null";
     return buf;
   }
   switch (pObj->GetType()) {
     case PDFOBJ_NULL:
       buf << " null";
       break;
     case PDFOBJ_BOOLEAN:
     case PDFOBJ_NUMBER:
       buf << " " << pObj->GetString();
@@ skipping 79 matching lines @@
       if (num == index) {
         return pNumbers->GetElementValue(i * 2 + 1);
       }
       if (index > num) {
         break;
       }
     }
     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 = SearchNumberNode(pKid, num);
     if (pFound) {
       return pFound;
     }
   }
   return NULL;
 }
 CPDF_Object* CPDF_NumberTree::LookupValue(int num) {
   return SearchNumberNode(m_pRoot, num);
 }