Get rid of NULLs in core/

core/fpdfapi/fpdf_parser/cpdf_security_handler.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/fpdfapi/fpdf_parser/cpdf_security_handler.h"
 
 #include <time.h>
 
@@ skipping 516 matching lines @@
                                     uint32_t type) {
   int cipher = 0, key_len = 0;
   if (!LoadDict(pEncryptDict, type, cipher, key_len)) {
     return;
   }
   if (bDefault && (!owner_pass || owner_size == 0)) {
     owner_pass = user_pass;
     owner_size = user_size;
   }
   if (m_Revision >= 5) {
-    int t = (int)time(NULL);
+    int t = (int)time(nullptr);
     uint8_t sha[128];
     CRYPT_SHA256Start(sha);
     CRYPT_SHA256Update(sha, (uint8_t*)&t, sizeof t);
     CRYPT_SHA256Update(sha, m_EncryptKey, 32);
     CRYPT_SHA256Update(sha, (uint8_t*)"there", 5);
     CRYPT_SHA256Finish(sha, m_EncryptKey);
     AES256_SetPassword(pEncryptDict, user_pass, user_size, FALSE, m_EncryptKey);
     if (bDefault) {
       AES256_SetPassword(pEncryptDict, owner_pass, owner_size, TRUE,
                          m_EncryptKey);
@@ skipping 71 matching lines @@
                                     uint32_t owner_size,
                                     uint32_t type) {
   OnCreate(pEncryptDict, pIdArray, user_pass, user_size, owner_pass, owner_size,
            TRUE, type);
 }
 void CPDF_SecurityHandler::OnCreate(CPDF_Dictionary* pEncryptDict,
                                     CPDF_Array* pIdArray,
                                     const uint8_t* user_pass,
                                     uint32_t user_size,
                                     uint32_t type) {
-  OnCreate(pEncryptDict, pIdArray, user_pass, user_size, NULL, 0, FALSE, type);
+  OnCreate(pEncryptDict, pIdArray, user_pass, user_size, nullptr, 0, FALSE,
+           type);
 }
 void CPDF_SecurityHandler::AES256_SetPassword(CPDF_Dictionary* pEncryptDict,
                                               const uint8_t* password,
                                               uint32_t size,
                                               FX_BOOL bOwner,
                                               const uint8_t* key) {
   uint8_t sha[128];
   CRYPT_SHA1Start(sha);
   CRYPT_SHA1Update(sha, key, 32);
   CRYPT_SHA1Update(sha, (uint8_t*)"hello", 5);
@@ skipping 55 matching lines @@
   buf[11] = 'b';
   uint8_t* aes = FX_Alloc(uint8_t, 2048);
   CRYPT_AESSetKey(aes, 16, key, 32, TRUE);
   uint8_t iv[16], buf1[16];
   FXSYS_memset(iv, 0, 16);
   CRYPT_AESSetIV(aes, iv);
   CRYPT_AESEncrypt(aes, buf1, buf, 16);
   FX_Free(aes);
   pEncryptDict->SetAtString("Perms", CFX_ByteString(buf1, 16));
 }