Remove "this==NULL" and adjust corresponding callers

core/src/fpdfapi/fpdf_parser/fpdf_parser_encrypt.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 <time.h>
 #include "../../../include/fpdfapi/fpdf_parser.h"
 #include "../../../include/fdrm/fx_crypt.h"
 const FX_BYTE defpasscode[32] = {
@@ skipping 274 matching lines @@
         ++i;
     }
     FX_Free(aes);
     if (hash) {
         FXSYS_memcpy32(hash, input, 32);
     }
 }
 FX_BOOL CPDF_StandardSecurityHandler::AES256_CheckPassword(FX_LPCBYTE password, FX_DWORD size,
         FX_BOOL bOwner, FX_LPBYTE key)
 {
-    CFX_ByteString okey = m_pEncryptDict->GetString(FX_BSTRC("O"));
+    CFX_ByteString okey = m_pEncryptDict ? m_pEncryptDict->GetString(FX_BSTRC("O")) : CFX_ByteString();
     if (okey.GetLength() < 48) {
         return FALSE;
     }
-    CFX_ByteString ukey = m_pEncryptDict->GetString(FX_BSTRC("U"));
+    CFX_ByteString ukey = m_pEncryptDict ? m_pEncryptDict->GetString(FX_BSTRC("U")) : CFX_ByteString();
     if (ukey.GetLength() < 48) {
         return FALSE;
     }
     FX_LPCBYTE pkey = bOwner ? (FX_LPCBYTE)okey : (FX_LPCBYTE)ukey;
     FX_BYTE sha[128];
     FX_BYTE digest[32];
     if (m_Revision >= 6) {
         Revision6_Hash(password, size, (FX_LPCBYTE)pkey + 32, (bOwner ? (FX_LPCBYTE)ukey : NULL), digest);
     } else {
         CRYPT_SHA256Start(sha);
@@ skipping 14 matching lines @@
         Revision6_Hash(password, size, (FX_LPCBYTE)pkey + 40, (bOwner ? (FX_LPCBYTE)ukey : NULL), digest);
     } else {
         CRYPT_SHA256Start(sha);
         CRYPT_SHA256Update(sha, password, size);
         CRYPT_SHA256Update(sha, pkey + 40, 8);
         if (bOwner) {
             CRYPT_SHA256Update(sha, ukey, 48);
         }
         CRYPT_SHA256Finish(sha, digest);
     }
-    CFX_ByteString ekey = m_pEncryptDict->GetString(bOwner ? FX_BSTRC("OE") : FX_BSTRC("UE"));
+    CFX_ByteString ekey = m_pEncryptDict ? m_pEncryptDict->GetString(bOwner ? FX_BSTRC("OE") : FX_BSTRC("UE")) : CFX_ByteString();
     if (ekey.GetLength() < 32) {
         return FALSE;
     }
     FX_BYTE* aes = FX_Alloc(FX_BYTE, 2048);
     CRYPT_AESSetKey(aes, 16, digest, 32, FALSE);
     FX_BYTE iv[16];
     FXSYS_memset32(iv, 0, 16);
     CRYPT_AESSetIV(aes, iv);
     CRYPT_AESDecrypt(aes, key, ekey, 32);
     CRYPT_AESSetKey(aes, 16, key, 32, FALSE);
@@ skipping 39 matching lines @@
     if (bOwner) {
         return CheckOwnerPassword(password, size, key, key_len);
     }
     return CheckUserPassword(password, size, FALSE, key, key_len) || CheckUserPassword(password, size, TRUE, key, key_len);
 }
 FX_BOOL CPDF_StandardSecurityHandler::CheckUserPassword(FX_LPCBYTE password, FX_DWORD pass_size,
         FX_BOOL bIgnoreEncryptMeta, FX_LPBYTE key, FX_INT32 key_len)
 {
     CalcEncryptKey(m_pEncryptDict, password, pass_size, key, key_len, bIgnoreEncryptMeta,
                    m_pParser->GetIDArray());
-    CFX_ByteString ukey = m_pEncryptDict->GetString(FX_BSTRC("U"));
+    CFX_ByteString ukey = m_pEncryptDict ? m_pEncryptDict->GetString(FX_BSTRC("U")) : CFX_ByteString();
     if (ukey.GetLength() < 16) {
         return FALSE;
     }
     FX_BYTE ukeybuf[32];
     if (m_Revision == 2) {
         FXSYS_memcpy32(ukeybuf, defpasscode, 32);
         CRYPT_ArcFourCryptBlock(ukeybuf, 32, key, key_len);
     } else {
         FX_BYTE test[32], tmpkey[32];
         FX_DWORD copy_len = sizeof(test);
@@ skipping 543 matching lines @@
     m_pAESContext = NULL;
     m_Cipher = FXCIPHER_NONE;
     m_KeyLen = 0;
 }
 CPDF_StandardCryptoHandler::~CPDF_StandardCryptoHandler()
 {
     if (m_pAESContext) {
         FX_Free(m_pAESContext);
     }
 }