Get rid of NULLs in xfa/

xfa/fxfa/app/xfa_checksum.cpp

Index: xfa/fxfa/app/xfa_checksum.cpp
diff --git a/xfa/fxfa/app/xfa_checksum.cpp b/xfa/fxfa/app/xfa_checksum.cpp
index b279dc95961e32594f5efa80a1cab7c0e80e2aa9..f1553d0f27a04c94b81b5270f39f2712a60c12b1 100644
--- a/xfa/fxfa/app/xfa_checksum.cpp
+++ b/xfa/fxfa/app/xfa_checksum.cpp
@@ -54,11 +54,11 @@ void Base64EncodePiece(const FX_BASE64DATA& src,
 }
 
 int32_t Base64EncodeA(const uint8_t* pSrc, int32_t iSrcLen, FX_CHAR* pDst) {
-  ASSERT(pSrc != NULL);
+  ASSERT(pSrc);
   if (iSrcLen < 1) {
     return 0;
   }
-  if (pDst == NULL) {
+  if (!pDst) {
     int32_t iDstLen = iSrcLen / 3 * 4;
     if ((iSrcLen % 3) != 0) {
       iDstLen += 4;
@@ -102,7 +102,7 @@ void* CXFA_SAXReaderHandler::OnTagEnter(const CFX_ByteStringC& bsTagName,
   UpdateChecksum(TRUE);
   if (eType != CFX_SAXItem::Type::Tag &&
       eType != CFX_SAXItem::Type::Instruction) {
-    return NULL;
+    return nullptr;
   }
   m_SAXContext.m_eNode = eType;
   CFX_ByteTextBuf& textBuf = m_SAXContext.m_TextBuf;
@@ -117,16 +117,16 @@ void* CXFA_SAXReaderHandler::OnTagEnter(const CFX_ByteStringC& bsTagName,
 void CXFA_SAXReaderHandler::OnTagAttribute(void* pTag,
                                            const CFX_ByteStringC& bsAttri,
                                            const CFX_ByteStringC& bsValue) {
-  if (pTag == NULL) {
+  if (!pTag)
     return;
-  }
+
   CFX_ByteTextBuf& textBuf = ((CXFA_SAXContext*)pTag)->m_TextBuf;
   textBuf << " " << bsAttri << "=\"" << bsValue << "\"";
 }
 void CXFA_SAXReaderHandler::OnTagBreak(void* pTag) {
-  if (pTag == NULL) {
+  if (!pTag)
     return;
-  }
+
   CFX_ByteTextBuf& textBuf = ((CXFA_SAXContext*)pTag)->m_TextBuf;
   textBuf << ">";
   UpdateChecksum(FALSE);
@@ -135,9 +135,9 @@ void CXFA_SAXReaderHandler::OnTagData(void* pTag,
                                       CFX_SAXItem::Type eType,
                                       const CFX_ByteStringC& bsData,
                                       uint32_t dwStartPos) {
-  if (pTag == NULL) {
+  if (!pTag)
     return;
-  }
+
   CFX_ByteTextBuf& textBuf = ((CXFA_SAXContext*)pTag)->m_TextBuf;
   if (eType == CFX_SAXItem::Type::CharData) {
     textBuf << "<![CDATA[";
@@ -148,9 +148,9 @@ void CXFA_SAXReaderHandler::OnTagData(void* pTag,
   }
 }
 void CXFA_SAXReaderHandler::OnTagClose(void* pTag, uint32_t dwEndPos) {
-  if (pTag == NULL) {
+  if (!pTag)
     return;
-  }
+
   CXFA_SAXContext* pSAXContext = (CXFA_SAXContext*)pTag;
   CFX_ByteTextBuf& textBuf = pSAXContext->m_TextBuf;
   if (pSAXContext->m_eNode == CFX_SAXItem::Type::Instruction) {
@@ -163,9 +163,9 @@ void CXFA_SAXReaderHandler::OnTagClose(void* pTag, uint32_t dwEndPos) {
 void CXFA_SAXReaderHandler::OnTagEnd(void* pTag,
                                      const CFX_ByteStringC& bsTagName,
                                      uint32_t dwEndPos) {
-  if (pTag == NULL) {
+  if (!pTag)
     return;
-  }
+
   CFX_ByteTextBuf& textBuf = ((CXFA_SAXContext*)pTag)->m_TextBuf;
   textBuf << "</" << bsTagName << ">";
   UpdateChecksum(FALSE);
@@ -174,9 +174,9 @@ void CXFA_SAXReaderHandler::OnTargetData(void* pTag,
                                          CFX_SAXItem::Type eType,
                                          const CFX_ByteStringC& bsData,
                                          uint32_t dwStartPos) {
-  if (pTag == NULL && eType != CFX_SAXItem::Type::Comment) {
+  if (!pTag && eType != CFX_SAXItem::Type::Comment)
     return;
-  }
+
   if (eType == CFX_SAXItem::Type::Comment) {
     CFX_ByteTextBuf& textBuf = m_SAXContext.m_TextBuf;
     textBuf << "<!--" << bsData << "-->";
@@ -240,7 +240,7 @@ FX_BOOL CXFA_ChecksumContext::UpdateChecksum(IFX_FileRead* pSrcFile,
               CFX_SaxParseMode_NotConvert_sharp) < 0) {
     return FALSE;
   }
-  return m_pSAXReader->ContinueParse(NULL) > 99;
+  return m_pSAXReader->ContinueParse(nullptr) > 99;
 }
 
 void CXFA_ChecksumContext::FinishChecksum() {
@@ -250,12 +250,12 @@ void CXFA_ChecksumContext::FinishChecksum() {
     uint8_t digest[20];
     FXSYS_memset(digest, 0, 20);
     CRYPT_SHA1Finish(m_pByteContext, digest);
-    int32_t nLen = Base64EncodeA(digest, 20, NULL);
+    int32_t nLen = Base64EncodeA(digest, 20, nullptr);
     FX_CHAR* pBuffer = m_bsChecksum.GetBuffer(nLen);
     Base64EncodeA(digest, 20, pBuffer);
     m_bsChecksum.ReleaseBuffer(nLen);
     FX_Free(m_pByteContext);
-    m_pByteContext = NULL;
+    m_pByteContext = nullptr;
   }
 }