Get rid of NULLs in core/

core/fxcrt/fx_extension.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 <utility>
 
 #include "core/fxcrt/extension.h"
 #include "core/fxcrt/include/fx_basic.h"
@@ skipping 50 matching lines @@
   return (FX_BOOL)m_pFile->WritePos(buffer, size, offset);
 }
 
 FX_BOOL CFX_CRTFileStream::Flush() {
   return m_pFile->Flush();
 }
 
 #ifdef PDF_ENABLE_XFA
 IFX_FileAccess* FX_CreateDefaultFileAccess(const CFX_WideStringC& wsPath) {
   if (wsPath.GetLength() == 0)
-    return NULL;
+    return nullptr;
 
-  CFX_CRTFileAccess* pFA = NULL;
-  pFA = new CFX_CRTFileAccess;
-  if (NULL == pFA)
-    return NULL;
-
+  CFX_CRTFileAccess* pFA = new CFX_CRTFileAccess;
   pFA->Init(wsPath);
   return pFA;
 }
 #endif  // PDF_ENABLE_XFA
 
 IFX_FileStream* FX_CreateFileStream(const FX_CHAR* filename, uint32_t dwModes) {
   std::unique_ptr<IFXCRT_FileAccess> pFA(IFXCRT_FileAccess::Create());
   if (!pFA->Open(filename, dwModes))
     return nullptr;
   return new CFX_CRTFileStream(std::move(pFA));
@@ skipping 210 matching lines @@
   ::GetSystemTime(&st1);
   do {
     ::GetSystemTime(&st2);
   } while (FXSYS_memcmp(&st1, &st2, sizeof(SYSTEMTIME)) == 0);
   uint32_t dwHash1 =
       FX_HashCode_GetA(CFX_ByteStringC((uint8_t*)&st1, sizeof(st1)), true);
   uint32_t dwHash2 =
       FX_HashCode_GetA(CFX_ByteStringC((uint8_t*)&st2, sizeof(st2)), true);
   ::srand((dwHash1 << 16) | (uint32_t)dwHash2);
 #else
-  time_t tmLast = time(NULL);
+  time_t tmLast = time(nullptr);
   time_t tmCur;
-  while ((tmCur = time(NULL)) == tmLast) {
+  while ((tmCur = time(nullptr)) == tmLast) {
     continue;
   }
 
   ::srand((tmCur << 16) | (tmLast & 0xFFFF));
 #endif
   while (iCount-- > 0) {
     *pBuffer++ = (uint32_t)((::rand() << 16) | (::rand() & 0xFFFF));
   }
 }
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
 FX_BOOL FX_GenerateCryptoRandom(uint32_t* pBuffer, int32_t iCount) {
-  HCRYPTPROV hCP = NULL;
-  if (!::CryptAcquireContext(&hCP, NULL, NULL, PROV_RSA_FULL, 0) || !hCP) {
+  HCRYPTPROV hCP = 0;
+  if (!::CryptAcquireContext(&hCP, nullptr, nullptr, PROV_RSA_FULL, 0) ||
+      !hCP) {
     return FALSE;
   }
   ::CryptGenRandom(hCP, iCount * sizeof(uint32_t), (uint8_t*)pBuffer);
   ::CryptReleaseContext(hCP, 0);
   return TRUE;
 }
 #endif
 void FX_Random_GenerateCrypto(uint32_t* pBuffer, int32_t iCount) {
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_WINDOWS_
   FX_GenerateCryptoRandom(pBuffer, iCount);
@@ skipping 18 matching lines @@
     b = ((const uint8_t*)pGUID)[i];
     *pBuf++ = gs_FX_pHexChars[b >> 4];
     *pBuf++ = gs_FX_pHexChars[b & 0x0F];
     if (bSeparator && (i == 3 || i == 5 || i == 7 || i == 9)) {
       *pBuf++ = L'-';
     }
   }
   bsStr.ReleaseBuffer(bSeparator ? 36 : 32);
 }
 #endif  // PDF_ENABLE_XFA