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

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1512763013 .

46 files changed, 170 insertions, 202 deletions

diff --git a/core/include/fxcrt/fx_basic.h b/core/include/fxcrt/fx_basic.h
index 8a39729fd0..b712d7b5ed 100644
--- a/core/include/fxcrt/fx_basic.h
+++ b/core/include/fxcrt/fx_basic.h
@@ -1071,7 +1071,7 @@ class CFX_ListArrayTemplate {
 
   T2& operator[](int32_t nIndex) {
     uint8_t* data = m_Data.GetAt(nIndex);
-    FXSYS_assert(data != NULL);
+    FXSYS_assert(data);
     return (T2&)(*(volatile T2*)data);
   }
 
diff --git a/core/include/fxcrt/fx_ext.h b/core/include/fxcrt/fx_ext.h
index f13d37caf4..e8d8bc7b5f 100644
--- a/core/include/fxcrt/fx_ext.h
+++ b/core/include/fxcrt/fx_ext.h
@@ -79,7 +79,7 @@ template <class baseType>
 class CFX_SSortTemplate {
  public:
   void ShellSort(baseType* pArray, int32_t iCount) {
-    FXSYS_assert(pArray != NULL && iCount > 0);
+    FXSYS_assert(pArray && iCount > 0);
     int32_t i, j, gap;
     baseType v1, v2;
     gap = iCount >> 1;
diff --git a/core/src/fdrm/crypto/fx_crypt_sha.cpp b/core/src/fdrm/crypto/fx_crypt_sha.cpp
index 21046f1df2..ecefdde05a 100644
--- a/core/src/fdrm/crypto/fx_crypt_sha.cpp
+++ b/core/src/fdrm/crypto/fx_crypt_sha.cpp
@@ -369,7 +369,7 @@ typedef struct {
   uint8_t buffer[128];
 } sha384_context;
 uint64_t FX_ato64i(const FX_CHAR* str) {
-  FXSYS_assert(str != NULL);
+  FXSYS_assert(str);
   uint64_t ret = 0;
   int len = (int)FXSYS_strlen(str);
   len = len > 16 ? 16 : len;
diff --git a/core/src/fpdfapi/fpdf_edit/fpdf_edit_content.cpp b/core/src/fpdfapi/fpdf_edit/fpdf_edit_content.cpp
index 4df841fb75..eda51deb3b 100644
--- a/core/src/fpdfapi/fpdf_edit/fpdf_edit_content.cpp
+++ b/core/src/fpdfapi/fpdf_edit/fpdf_edit_content.cpp
@@ -45,7 +45,7 @@ void CPDF_PageContentGenerate::GenerateContent() {
   }
   CPDF_Object* pContent =
       pPageDict ? pPageDict->GetElementValue("Contents") : NULL;
-  if (pContent != NULL) {
+  if (pContent) {
     pPageDict->RemoveAt("Contents");
   }
   CPDF_Stream* pStream = new CPDF_Stream(NULL, 0, NULL);
diff --git a/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp b/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
index 52129d9e54..a797332727 100644
--- a/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
+++ b/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
@@ -1433,8 +1433,8 @@ void CPDF_Creator::InitNewObjNumOffsets() {
   FX_BOOL bNewStart = FALSE;
   for (; i < iCount; i++) {
     FX_DWORD dwCurObjNum = m_NewObjNumArray.ElementAt(i);
-    FX_BOOL bExist = (dwCurObjNum < nOldSize &&
-                      m_ObjectOffset.GetPtrAt(dwCurObjNum) != NULL);
+    FX_BOOL bExist =
+        (dwCurObjNum < nOldSize && m_ObjectOffset.GetPtrAt(dwCurObjNum));
     if (bExist || dwCurObjNum - dwLastObjNum > 1) {
       if (!bNewStart) {
         m_ObjectOffset.Add(dwStartObjNum, dwLastObjNum - dwStartObjNum + 1);
diff --git a/core/src/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp b/core/src/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
index 5467cfdaec..7febc7932f 100644
--- a/core/src/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
+++ b/core/src/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
@@ -429,7 +429,7 @@ CPDF_Font* CPDF_Document::AddWindowsFont(LOGFONTA* pLogFont,
 
 #if (_FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_)
 uint32_t FX_GetLangHashCode(const FX_CHAR* pStr) {
-  FXSYS_assert(pStr != NULL);
+  FXSYS_assert(pStr);
   int32_t iLength = FXSYS_strlen(pStr);
   const FX_CHAR* pStrEnd = pStr + iLength;
   uint32_t uHashCode = 0;
diff --git a/core/src/fpdfapi/fpdf_edit/fpdf_edit_image.cpp b/core/src/fpdfapi/fpdf_edit/fpdf_edit_image.cpp
index ccb184c6cf..640e8671f8 100644
--- a/core/src/fpdfapi/fpdf_edit/fpdf_edit_image.cpp
+++ b/core/src/fpdfapi/fpdf_edit/fpdf_edit_image.cpp
@@ -259,7 +259,7 @@ void CPDF_Image::SetImage(const CFX_DIBitmap* pBitmap,
       delete pMaskBitmap;
     }
   }
-  FX_BOOL bStream = pFileWrite != NULL && pFileRead != NULL;
+  FX_BOOL bStream = pFileWrite && pFileRead;
   if (opType == 0) {
     if (iCompress & PDF_IMAGE_LOSSLESS_COMPRESS) {
       if (pBitmap->GetBPP() == 1) {
@@ -270,7 +270,7 @@ void CPDF_Image::SetImage(const CFX_DIBitmap* pBitmap,
       if (pBitmap->GetBPP() == 1) {
         _JBIG2EncodeBitmap(pDict, pBitmap, m_pDocument, dest_buf, dest_size,
                            FALSE);
-      } else if (pBitmap->GetBPP() >= 8 && pBitmap->GetPalette() != NULL) {
+      } else if (pBitmap->GetBPP() >= 8 && pBitmap->GetPalette()) {
         CFX_DIBitmap* pNewBitmap = new CFX_DIBitmap();
         pNewBitmap->Copy(pBitmap);
         pNewBitmap->ConvertFormat(FXDIB_Rgb);
diff --git a/core/src/fpdfapi/fpdf_font/fpdf_font.cpp b/core/src/fpdfapi/fpdf_font/fpdf_font.cpp
index b515d90a7f..4a71382da4 100644
--- a/core/src/fpdfapi/fpdf_font/fpdf_font.cpp
+++ b/core/src/fpdfapi/fpdf_font/fpdf_font.cpp
@@ -1519,7 +1519,7 @@ void CPDF_TrueTypeFont::LoadGlyphMap() {
         }
       }
       if ((m_GlyphIndex[charcode] == 0 || m_GlyphIndex[charcode] == 0xffff) &&
-          name != NULL) {
+          name) {
         if (name[0] == '.' && FXSYS_strcmp(name, ".notdef") == 0) {
           m_GlyphIndex[charcode] = FXFT_Get_Char_Index(m_Font.GetFace(), 32);
         } else {
diff --git a/core/src/fpdfapi/fpdf_font/ttgsubtable.h b/core/src/fpdfapi/fpdf_font/ttgsubtable.h
index e3c9965654..605d25fd57 100644
--- a/core/src/fpdfapi/fpdf_font/ttgsubtable.h
+++ b/core/src/fpdfapi/fpdf_font/ttgsubtable.h
@@ -277,10 +277,9 @@ class CFX_CTTGSUBTable {
     TLookup()
         : LookupType(0), LookupFlag(0), SubTableCount(0), SubTable(NULL) {}
     ~TLookup() {
-      if (SubTableCount > 0 && SubTable != NULL) {
-        for (int i = 0; i < SubTableCount; i++) {
+      if (SubTable) {
+        for (int i = 0; i < SubTableCount; ++i)
           delete SubTable[i];
-        }
         delete[] SubTable;
       }
     }
diff --git a/core/src/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp b/core/src/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp
index 0bf044101c..fbe6faa471 100644
--- a/core/src/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp
+++ b/core/src/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp
@@ -349,7 +349,7 @@ CPDF_Stream* CPDF_StreamParser::ReadInlineStream(CPDF_Document* pDoc,
   FX_DWORD width = pDict->GetInteger("Width");
   FX_DWORD height = pDict->GetInteger("Height");
   FX_DWORD OrigSize = 0;
-  if (pCSObj != NULL) {
+  if (pCSObj) {
     FX_DWORD bpc = pDict->GetInteger("BitsPerComponent");
     FX_DWORD nComponents = 1;
     CPDF_ColorSpace* pCS = pDoc->LoadColorSpace(pCSObj);
diff --git a/core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp b/core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp
index e1a7493a2f..5ead9a5bea 100644
--- a/core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp
+++ b/core/src/fpdfapi/fpdf_page/fpdf_page_pattern.cpp
@@ -44,7 +44,7 @@ CPDF_TilingPattern::CPDF_TilingPattern(CPDF_Document* pDoc,
   m_pPatternObj = pPatternObj;
   m_pDocument = pDoc;
   CPDF_Dictionary* pDict = m_pPatternObj->GetDict();
-  ASSERT(pDict != NULL);
+  ASSERT(pDict);
   m_Pattern2Form = pDict->GetMatrix("Matrix");
   m_bColored = pDict->GetInteger("PaintType") == 1;
   if (parentMatrix) {
@@ -88,7 +88,7 @@ CPDF_ShadingPattern::CPDF_ShadingPattern(CPDF_Document* pDoc,
   m_bShadingObj = bShading;
   if (!bShading) {
     CPDF_Dictionary* pDict = m_pPatternObj->GetDict();
-    ASSERT(pDict != NULL);
+    ASSERT(pDict);
     m_Pattern2Form = pDict->GetMatrix("Matrix");
     m_pShadingObj = pDict->GetElementValue("Shading");
     if (parentMatrix) {
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_document.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_document.cpp
index 2d7c4b0eec..6625cce2e6 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_document.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_document.cpp
@@ -9,7 +9,7 @@
 
 CPDF_Document::CPDF_Document(CPDF_Parser* pParser)
     : CPDF_IndirectObjects(pParser) {
-  ASSERT(pParser != NULL);
+  ASSERT(pParser);
   m_pRootDict = NULL;
   m_pInfoDict = NULL;
   m_bLinearized = FALSE;
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
index 857e19c28f..58b03c1887 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
@@ -161,7 +161,6 @@ CPDF_Array* CPDF_Object::GetArray() const {
   return const_cast<CPDF_Array*>(AsArray());
 }
 void CPDF_Object::SetString(const CFX_ByteString& str) {
-  ASSERT(this != NULL);
   switch (m_Type) {
     case PDFOBJ_BOOLEAN:
       AsBoolean()->m_bValue = (str == "true");
@@ -526,17 +525,15 @@ void CPDF_Array::SetAt(FX_DWORD i,
 void CPDF_Array::InsertAt(FX_DWORD index,
                           CPDF_Object* pObj,
                           CPDF_IndirectObjects* pObjs) {
-  ASSERT(pObj != NULL);
   if (pObj->GetObjNum()) {
-    ASSERT(pObjs != NULL);
+    ASSERT(pObjs);
     pObj = new CPDF_Reference(pObjs, pObj->GetObjNum());
   }
   m_Objects.InsertAt(index, pObj);
 }
 void CPDF_Array::Add(CPDF_Object* pObj, CPDF_IndirectObjects* pObjs) {
-  ASSERT(pObj != NULL);
   if (pObj->GetObjNum()) {
-    ASSERT(pObjs != NULL);
+    ASSERT(pObjs);
     pObj = new CPDF_Reference(pObjs, pObj->GetObjNum());
   }
   m_Objects.Add(pObj);
diff --git a/core/src/fpdfapi/fpdf_render/fpdf_render.cpp b/core/src/fpdfapi/fpdf_render/fpdf_render.cpp
index d7c3b6e6e8..801f9e737c 100644
--- a/core/src/fpdfapi/fpdf_render/fpdf_render.cpp
+++ b/core/src/fpdfapi/fpdf_render/fpdf_render.cpp
@@ -434,7 +434,7 @@ void CPDF_RenderStatus::DrawObjWithBackground(const CPDF_PageObject* pObj,
     res = 0;
   }
   CPDF_ScaledRenderBuffer buffer;
-  if (!buffer.Initialize(m_pContext, m_pDevice, &rect, pObj, &m_Options, res)) {
+  if (!buffer.Initialize(m_pContext, m_pDevice, rect, pObj, &m_Options, res)) {
     return;
   }
   CFX_Matrix matrix = *pObj2Device;
@@ -537,12 +537,9 @@ FX_BOOL CPDF_RenderStatus::ProcessPath(CPDF_PathObject* pPathObj,
                              m_curBlend);
 }
 CPDF_TransferFunc* CPDF_RenderStatus::GetTransferFunc(CPDF_Object* pObj) const {
-  ASSERT(pObj != NULL);
+  ASSERT(pObj);
   CPDF_DocRenderData* pDocCache = m_pContext->m_pDocument->GetRenderData();
-  if (!pDocCache) {
-    return NULL;
-  }
-  return pDocCache->GetTransferFunc(pObj);
+  return pDocCache ? pDocCache->GetTransferFunc(pObj) : nullptr;
 }
 FX_ARGB CPDF_RenderStatus::GetFillArgb(const CPDF_PageObject* pObj,
                                        FX_BOOL bType3) const {
@@ -1343,19 +1340,18 @@ CPDF_ScaledRenderBuffer::~CPDF_ScaledRenderBuffer() {}
 #define _FPDFAPI_IMAGESIZE_LIMIT_ (30 * 1024 * 1024)
 FX_BOOL CPDF_ScaledRenderBuffer::Initialize(CPDF_RenderContext* pContext,
                                             CFX_RenderDevice* pDevice,
-                                            FX_RECT* pRect,
+                                            const FX_RECT& pRect,
                                             const CPDF_PageObject* pObj,
                                             const CPDF_RenderOptions* pOptions,
                                             int max_dpi) {
-  FXSYS_assert(pRect != NULL);
   m_pDevice = pDevice;
   if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_GET_BITS) {
     return TRUE;
   }
   m_pContext = pContext;
-  m_Rect = *pRect;
+  m_Rect = pRect;
   m_pObject = pObj;
-  m_Matrix.TranslateI(-pRect->left, -pRect->top);
+  m_Matrix.TranslateI(-pRect.left, -pRect.top);
   int horz_size = pDevice->GetDeviceCaps(FXDC_HORZ_SIZE);
   int vert_size = pDevice->GetDeviceCaps(FXDC_VERT_SIZE);
   if (horz_size && vert_size && max_dpi) {
@@ -1380,7 +1376,7 @@ FX_BOOL CPDF_ScaledRenderBuffer::Initialize(CPDF_RenderContext* pContext,
   CFX_FloatRect rect;
   int32_t iWidth, iHeight, iPitch;
   while (1) {
-    rect = *pRect;
+    rect = pRect;
     m_Matrix.TransformRect(rect);
     FX_RECT bitmap_rect = rect.GetOutterRect();
     iWidth = bitmap_rect.Width();
diff --git a/core/src/fpdfapi/fpdf_render/fpdf_render_image.cpp b/core/src/fpdfapi/fpdf_render/fpdf_render_image.cpp
index 1d1c392af5..938a495eb1 100644
--- a/core/src/fpdfapi/fpdf_render/fpdf_render_image.cpp
+++ b/core/src/fpdfapi/fpdf_render/fpdf_render_image.cpp
@@ -344,7 +344,7 @@ FX_BOOL CPDF_ImageRenderer::StartLoadDIBSource() {
           m_LoadHandle, m_bStdCS, m_pRenderStatus->m_GroupFamily,
           m_pRenderStatus->m_bLoadMask, m_pRenderStatus, dest_width,
           dest_height)) {
-    if (m_LoadHandle != NULL) {
+    if (m_LoadHandle) {
       m_Status = 4;
       return TRUE;
     }
@@ -389,7 +389,7 @@ FX_BOOL CPDF_ImageRenderer::StartRenderDIBSource() {
     CPDF_Color* pColor = m_pImageObject->m_ColorState.GetFillColor();
     if (pColor && pColor->IsPattern()) {
       m_pPattern = pColor->GetPattern();
-      if (m_pPattern != NULL) {
+      if (m_pPattern) {
         m_bPatternColor = TRUE;
       }
     }
@@ -711,7 +711,7 @@ FX_BOOL CPDF_ImageRenderer::StartDIBSource() {
   if (m_pRenderStatus->m_pDevice->StartDIBits(
           m_pDIBSource, m_BitmapAlpha, m_FillArgb, &m_ImageMatrix, m_Flags,
           m_DeviceHandle, 0, NULL, m_BlendType)) {
-    if (m_DeviceHandle != NULL) {
+    if (m_DeviceHandle) {
       m_Status = 3;
       return TRUE;
     }
diff --git a/core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp b/core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp
index 70d2340c22..521ec16be1 100644
--- a/core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp
+++ b/core/src/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp
@@ -788,7 +788,7 @@ int CPDF_DIBSource::StratLoadMask() {
   m_pMaskStream = m_pDict->GetStream("SMask");
   if (m_pMaskStream) {
     CPDF_Array* pMatte = m_pMaskStream->GetDict()->GetArray("Matte");
-    if (pMatte != NULL && m_pColorSpace &&
+    if (pMatte && m_pColorSpace &&
         (FX_DWORD)m_pColorSpace->CountComponents() <= m_nComponents) {
       FX_FLOAT R, G, B;
       FX_FLOAT* pColor = FX_Alloc(FX_FLOAT, m_nComponents);
diff --git a/core/src/fpdfapi/fpdf_render/fpdf_render_text.cpp b/core/src/fpdfapi/fpdf_render/fpdf_render_text.cpp
index 3a56058295..774e749322 100644
--- a/core/src/fpdfapi/fpdf_render/fpdf_render_text.cpp
+++ b/core/src/fpdfapi/fpdf_render/fpdf_render_text.cpp
@@ -313,7 +313,7 @@ static void ReleaseCachedType3(CPDF_Type3Font* pFont) {
   pFont->m_pDocument->GetPageData()->ReleaseFont(pFont->GetFontDict());
 }
 FX_BOOL CPDF_Type3Char::LoadBitmap(CPDF_RenderContext* pContext) {
-  if (m_pBitmap != NULL || m_pForm == NULL) {
+  if (m_pBitmap || m_pForm == NULL) {
     return TRUE;
   }
   if (m_pForm->CountObjects() == 1 && !m_bColored) {
diff --git a/core/src/fpdfapi/fpdf_render/render_int.h b/core/src/fpdfapi/fpdf_render/render_int.h
index d348b48dfd..26bef8ba42 100644
--- a/core/src/fpdfapi/fpdf_render/render_int.h
+++ b/core/src/fpdfapi/fpdf_render/render_int.h
@@ -384,7 +384,7 @@ class CPDF_ScaledRenderBuffer {
 
   FX_BOOL Initialize(CPDF_RenderContext* pContext,
                      CFX_RenderDevice* pDevice,
-                     FX_RECT* pRect,
+                     const FX_RECT& pRect,
                      const CPDF_PageObject* pObj,
                      const CPDF_RenderOptions* pOptions = NULL,
                      int max_dpi = 0);
diff --git a/core/src/fpdfdoc/doc_action.cpp b/core/src/fpdfdoc/doc_action.cpp
index 3ad746067d..87cfe7e642 100644
--- a/core/src/fpdfdoc/doc_action.cpp
+++ b/core/src/fpdfdoc/doc_action.cpp
@@ -34,7 +34,7 @@ const FX_CHAR* g_sATypes[] = {
     "SetOCGState", "Rendition",  "Trans",     "GoTo3DView", ""};
 CPDF_Action::ActionType CPDF_Action::GetType() const {
   ActionType eType = Unknown;
-  if (m_pDict != NULL) {
+  if (m_pDict) {
     CFX_ByteString csType = m_pDict->GetString("S");
     if (!csType.IsEmpty()) {
       int i = 0;
@@ -80,7 +80,7 @@ CFX_ByteString CPDF_Action::GetURI(CPDF_Document* pDoc) const {
   csURI = m_pDict->GetString("URI");
   CPDF_Dictionary* pRoot = pDoc->GetRoot();
   CPDF_Dictionary* pURI = pRoot->GetDict("URI");
-  if (pURI != NULL) {
+  if (pURI) {
     if (csURI.Find(":", 0) < 1) {
       csURI = pURI->GetString("Base") + csURI;
     }
@@ -179,10 +179,7 @@ CFX_WideString CPDF_Action::GetJavaScript() const {
     return csJS;
   }
   CPDF_Object* pJS = m_pDict->GetElementValue("JS");
-  if (pJS != NULL) {
-    return pJS->GetUnicodeText();
-  }
-  return csJS;
+  return pJS ? pJS->GetUnicodeText() : csJS;
 }
 CPDF_Dictionary* CPDF_Action::GetAnnot() const {
   if (!m_pDict) {
@@ -298,13 +295,13 @@ CPDF_Action CPDF_AAction::GetNextAction(FX_POSITION& pos,
 CPDF_DocJSActions::CPDF_DocJSActions(CPDF_Document* pDoc) : m_pDocument(pDoc) {}
 
 int CPDF_DocJSActions::CountJSActions() const {
-  ASSERT(m_pDocument != NULL);
+  ASSERT(m_pDocument);
   CPDF_NameTree name_tree(m_pDocument, "JavaScript");
   return name_tree.GetCount();
 }
 CPDF_Action CPDF_DocJSActions::GetJSAction(int index,
                                            CFX_ByteString& csName) const {
-  ASSERT(m_pDocument != NULL);
+  ASSERT(m_pDocument);
   CPDF_NameTree name_tree(m_pDocument, "JavaScript");
   CPDF_Object* pAction = name_tree.LookupValue(index, csName);
   if (!ToDictionary(pAction)) {
@@ -313,7 +310,7 @@ CPDF_Action CPDF_DocJSActions::GetJSAction(int index,
   return CPDF_Action(pAction->GetDict());
 }
 CPDF_Action CPDF_DocJSActions::GetJSAction(const CFX_ByteString& csName) const {
-  ASSERT(m_pDocument != NULL);
+  ASSERT(m_pDocument);
   CPDF_NameTree name_tree(m_pDocument, "JavaScript");
   CPDF_Object* pAction = name_tree.LookupValue(csName);
   if (!ToDictionary(pAction)) {
@@ -322,7 +319,7 @@ CPDF_Action CPDF_DocJSActions::GetJSAction(const CFX_ByteString& csName) const {
   return CPDF_Action(pAction->GetDict());
 }
 int CPDF_DocJSActions::FindJSAction(const CFX_ByteString& csName) const {
-  ASSERT(m_pDocument != NULL);
+  ASSERT(m_pDocument);
   CPDF_NameTree name_tree(m_pDocument, "JavaScript");
   return name_tree.GetIndex(csName);
 }
diff --git a/core/src/fpdfdoc/doc_annot.cpp b/core/src/fpdfdoc/doc_annot.cpp
index cacd650dde..0871b357cf 100644
--- a/core/src/fpdfdoc/doc_annot.cpp
+++ b/core/src/fpdfdoc/doc_annot.cpp
@@ -304,7 +304,7 @@ void CPDF_Annot::DrawBorder(CFX_RenderDevice* pDevice,
   }
   CPDF_Array* pColor = m_pAnnotDict->GetArray("C");
   FX_DWORD argb = 0xff000000;
-  if (pColor != NULL) {
+  if (pColor) {
     int R = (int32_t)(pColor->GetNumber(0) * 255);
     int G = (int32_t)(pColor->GetNumber(1) * 255);
     int B = (int32_t)(pColor->GetNumber(2) * 255);
diff --git a/core/src/fpdfdoc/doc_ap.cpp b/core/src/fpdfdoc/doc_ap.cpp
index effe587090..1392ae6e2e 100644
--- a/core/src/fpdfdoc/doc_ap.cpp
+++ b/core/src/fpdfdoc/doc_ap.cpp
@@ -123,7 +123,7 @@ CFX_ByteString CPVT_FontMap::GetPDFFontAlias(int32_t nFontIndex) {
   return "";
 }
 CPVT_Provider::CPVT_Provider(IPVT_FontMap* pFontMap) : m_pFontMap(pFontMap) {
-  ASSERT(m_pFontMap != NULL);
+  ASSERT(m_pFontMap);
 }
 CPVT_Provider::~CPVT_Provider() {}
 int32_t CPVT_Provider::GetCharWidth(int32_t nFontIndex,
diff --git a/core/src/fpdfdoc/doc_basic.cpp b/core/src/fpdfdoc/doc_basic.cpp
index 904ccf7c1f..c58e10b779 100644
--- a/core/src/fpdfdoc/doc_basic.cpp
+++ b/core/src/fpdfdoc/doc_basic.cpp
@@ -77,7 +77,7 @@ static CPDF_Object* SearchNameNode(CPDF_Dictionary* pNode,
     return NULL;
   }
   CPDF_Array* pLimits = pNode->GetArray("Limits");
-  if (pLimits != NULL) {
+  if (pLimits) {
     CFX_ByteString csLeft = pLimits->GetString(0);
     CFX_ByteString csRight = pLimits->GetString(1);
     if (csLeft.Compare(csRight) > 0) {
@@ -96,7 +96,7 @@ static CPDF_Object* SearchNameNode(CPDF_Dictionary* pNode,
       CFX_ByteString csValue = pNames->GetString(i * 2);
       int32_t iCompare = csValue.Compare(csName);
       if (iCompare <= 0) {
-        if (ppFind != NULL) {
+        if (ppFind) {
           *ppFind = pNames;
         }
         if (iCompare < 0) {
@@ -144,7 +144,7 @@ static CPDF_Object* SearchNameNode(CPDF_Dictionary* pNode,
       nCurIndex += nCount;
       return NULL;
     }
-    if (ppFind != NULL) {
+    if (ppFind) {
       *ppFind = pNames;
     }
     csName = pNames->GetString((nIndex - nCurIndex) * 2);
@@ -389,7 +389,6 @@ CPDF_Stream* CPDF_FileSpec::GetFileStream() const {
 static void FPDFDOC_FILESPEC_SetFileName(CPDF_Object* pObj,
                                          const CFX_WideStringC& wsFileName,
                                          FX_BOOL bURL) {
-  ASSERT(pObj != NULL);
   CFX_WideString wsStr;
   if (bURL) {
     wsStr = wsFileName;
@@ -405,7 +404,6 @@ static void FPDFDOC_FILESPEC_SetFileName(CPDF_Object* pObj,
 }
 void CPDF_FileSpec::SetFileName(const CFX_WideStringC& wsFileName,
                                 FX_BOOL bURL) {
-  ASSERT(m_pObj != NULL);
   if (bURL) {
     if (CPDF_Dictionary* pDict = m_pObj->AsDictionary()) {
       pDict->SetAtName("FS", "URL");
@@ -483,12 +481,12 @@ CFX_WideString CPDF_PageLabel::GetLabel(int nPage) const {
   int n = nPage;
   while (n >= 0) {
     pValue = numberTree.LookupValue(n);
-    if (pValue != NULL) {
+    if (pValue) {
       break;
     }
     n--;
   }
-  if (pValue != NULL) {
+  if (pValue) {
     pValue = pValue->GetDirect();
     if (CPDF_Dictionary* pLabel = pValue->AsDictionary()) {
       if (pLabel->KeyExist("P")) {
diff --git a/core/src/fpdfdoc/doc_form.cpp b/core/src/fpdfdoc/doc_form.cpp
index 26857dd2af..80938f47c0 100644
--- a/core/src/fpdfdoc/doc_form.cpp
+++ b/core/src/fpdfdoc/doc_form.cpp
@@ -328,7 +328,7 @@ static int CALLBACK EnumFontFamExProc(ENUMLOGFONTEXA* lpelfe,
                                       NEWTEXTMETRICEX* lpntme,
                                       DWORD FontType,
                                       LPARAM lParam) {
-  if (FontType != 0x004 || strchr(lpelfe->elfLogFont.lfFaceName, '@') != NULL) {
+  if (FontType != 0x004 || strchr(lpelfe->elfLogFont.lfFaceName, '@')) {
     return 1;
   }
   LPDF_FONTDATA pData = (LPDF_FONTDATA)lParam;
@@ -355,7 +355,7 @@ static FX_BOOL RetrieveSpecificFont(uint8_t charSet,
   memset(&lf, 0, sizeof(LOGFONTA));
   lf.lfCharSet = charSet;
   lf.lfPitchAndFamily = pitchAndFamily;
-  if (pcsFontName != NULL) {
+  if (pcsFontName) {
     strcpy(lf.lfFaceName, pcsFontName);
   }
   return RetrieveSpecificFont(lf);
@@ -406,7 +406,7 @@ CFX_ByteString CPDF_InterForm::GetNativeFont(uint8_t charSet, void* pLogFont) {
     bRet = RetrieveSpecificFont(charSet, DEFAULT_PITCH | FF_DONTCARE, NULL, lf);
   }
   if (bRet) {
-    if (pLogFont != NULL) {
+    if (pLogFont) {
       memcpy(pLogFont, &lf, sizeof(LOGFONTA));
     }
     csFontName = lf.lfFaceName;
@@ -540,7 +540,7 @@ FX_BOOL CPDF_InterForm::ValidateFieldName(
         continue;
       }
       if (pField == pExcludedField) {
-        if (pExcludedControl != NULL) {
+        if (pExcludedControl) {
           if (pField->CountControls() < 2) {
             continue;
           }
@@ -904,10 +904,9 @@ void CPDF_InterForm::LoadField(CPDF_Dictionary* pFieldDict, int nLevel) {
   }
 }
 FX_BOOL CPDF_InterForm::HasXFAForm() const {
-  return m_pFormDict && m_pFormDict->GetArray("XFA") != NULL;
+  return m_pFormDict && m_pFormDict->GetArray("XFA");
 }
 void CPDF_InterForm::FixPageFields(const CPDF_Page* pPage) {
-  ASSERT(pPage != NULL);
   CPDF_Dictionary* pPageDict = pPage->m_pFormDict;
   if (pPageDict == NULL) {
     return;
@@ -919,7 +918,7 @@ void CPDF_InterForm::FixPageFields(const CPDF_Page* pPage) {
   int iAnnotCount = pAnnots->GetCount();
   for (int i = 0; i < iAnnotCount; i++) {
     CPDF_Dictionary* pAnnot = pAnnots->GetDict(i);
-    if (pAnnot != NULL && pAnnot->GetString("Subtype") == "Widget") {
+    if (pAnnot && pAnnot->GetString("Subtype") == "Widget") {
       LoadField(pAnnot);
     }
   }
@@ -1127,7 +1126,6 @@ const struct _SupportFieldEncoding {
 static void FPDFDOC_FDF_GetFieldValue(CPDF_Dictionary* pFieldDict,
                                       CFX_WideString& csValue,
                                       CFX_ByteString& bsEncoding) {
-  ASSERT(pFieldDict != NULL);
   CFX_ByteString csBValue = pFieldDict->GetString("V");
   int32_t iCount = sizeof(g_fieldEncoding) / sizeof(g_fieldEncoding[0]);
   int32_t i = 0;
@@ -1138,7 +1136,7 @@ static void FPDFDOC_FDF_GetFieldValue(CPDF_Dictionary* pFieldDict,
   if (i < iCount) {
     CFX_CharMap* pCharMap =
         CFX_CharMap::GetDefaultMapper(g_fieldEncoding[i].m_codePage);
-    FXSYS_assert(pCharMap != NULL);
+    FXSYS_assert(pCharMap);
     csValue.ConvertFrom(csBValue, pCharMap);
     return;
   }
@@ -1181,7 +1179,7 @@ void CPDF_InterForm::FDF_ImportField(CPDF_Dictionary* pFieldDict,
   CFX_WideString csWValue;
   FPDFDOC_FDF_GetFieldValue(pFieldDict, csWValue, m_bsEncoding);
   int iType = pField->GetFieldType();
-  if (bNotify && m_pFormNotify != NULL) {
+  if (bNotify && m_pFormNotify) {
     int iRet = 0;
     if (iType == FIELDTYPE_LISTBOX) {
       iRet = m_pFormNotify->BeforeSelectionChange(pField, csWValue);
@@ -1203,7 +1201,7 @@ void CPDF_InterForm::FDF_ImportField(CPDF_Dictionary* pFieldDict,
     pField->m_pDict->SetAt("Opt",
                            pFieldDict->GetElementValue("Opt")->Clone(TRUE));
   }
-  if (bNotify && m_pFormNotify != NULL) {
+  if (bNotify && m_pFormNotify) {
     if (iType == FIELDTYPE_CHECKBOX || iType == FIELDTYPE_RADIOBUTTON) {
       m_pFormNotify->AfterCheckedStatusChange(pField, statusArray);
     } else if (iType == FIELDTYPE_LISTBOX) {
@@ -1230,7 +1228,7 @@ FX_BOOL CPDF_InterForm::ImportFromFDF(const CFDF_Document* pFDF,
     return FALSE;
   }
   m_bsEncoding = pMainDict->GetString("Encoding");
-  if (bNotify && m_pFormNotify != NULL) {
+  if (bNotify && m_pFormNotify) {
     int iRet = m_pFormNotify->BeforeFormImportData(this);
     if (iRet < 0) {
       return FALSE;
@@ -1243,7 +1241,7 @@ FX_BOOL CPDF_InterForm::ImportFromFDF(const CFDF_Document* pFDF,
     }
     FDF_ImportField(pField, L"", bNotify);
   }
-  if (bNotify && m_pFormNotify != NULL) {
+  if (bNotify && m_pFormNotify) {
     m_pFormNotify->AfterFormImportData(this);
   }
   return TRUE;
diff --git a/core/src/fpdfdoc/doc_formfield.cpp b/core/src/fpdfdoc/doc_formfield.cpp
index e840665385..767b31b1d5 100644
--- a/core/src/fpdfdoc/doc_formfield.cpp
+++ b/core/src/fpdfdoc/doc_formfield.cpp
@@ -103,7 +103,7 @@ FX_BOOL CPDF_FormField::ResetField(FX_BOOL bNotify) {
     case CPDF_FormField::CheckBox:
     case CPDF_FormField::RadioButton: {
       CFX_ByteArray statusArray;
-      if (bNotify && m_pForm->m_pFormNotify != NULL) {
+      if (bNotify && m_pForm->m_pFormNotify) {
         SaveCheckedFieldStatus(this, statusArray);
       }
       int iCount = CountControls();
@@ -120,7 +120,7 @@ FX_BOOL CPDF_FormField::ResetField(FX_BOOL bNotify) {
           }
         }
       }
-      if (bNotify && m_pForm->m_pFormNotify != NULL) {
+      if (bNotify && m_pForm->m_pFormNotify) {
         m_pForm->m_pFormNotify->AfterCheckedStatusChange(this, statusArray);
       }
     } break;
@@ -131,14 +131,14 @@ FX_BOOL CPDF_FormField::ResetField(FX_BOOL bNotify) {
       if (iIndex >= 0) {
         csValue = GetOptionLabel(iIndex);
       }
-      if (bNotify && m_pForm->m_pFormNotify != NULL) {
+      if (bNotify && m_pForm->m_pFormNotify) {
         int iRet = m_pForm->m_pFormNotify->BeforeValueChange(this, csValue);
         if (iRet < 0) {
           return FALSE;
         }
       }
       SetItemSelection(iIndex, TRUE);
-      if (bNotify && m_pForm->m_pFormNotify != NULL) {
+      if (bNotify && m_pForm->m_pFormNotify) {
         m_pForm->m_pFormNotify->AfterValueChange(this);
       }
     } break;
@@ -149,14 +149,14 @@ FX_BOOL CPDF_FormField::ResetField(FX_BOOL bNotify) {
       if (iIndex >= 0) {
         csValue = GetOptionLabel(iIndex);
       }
-      if (bNotify && m_pForm->m_pFormNotify != NULL) {
+      if (bNotify && m_pForm->m_pFormNotify) {
         int iRet = m_pForm->m_pFormNotify->BeforeSelectionChange(this, csValue);
         if (iRet < 0) {
           return FALSE;
         }
       }
       SetItemSelection(iIndex, TRUE);
-      if (bNotify && m_pForm->m_pFormNotify != NULL) {
+      if (bNotify && m_pForm->m_pFormNotify) {
         m_pForm->m_pFormNotify->AfterSelectionChange(this);
       }
     } break;
@@ -166,19 +166,19 @@ FX_BOOL CPDF_FormField::ResetField(FX_BOOL bNotify) {
     default: {
       CPDF_Object* pDV = FPDF_GetFieldAttr(m_pDict, "DV");
       CFX_WideString csDValue;
-      if (pDV != NULL) {
+      if (pDV) {
         csDValue = pDV->GetUnicodeText();
       }
       CPDF_Object* pV = FPDF_GetFieldAttr(m_pDict, "V");
       CFX_WideString csValue;
-      if (pV != NULL) {
+      if (pV) {
         csValue = pV->GetUnicodeText();
       }
       CPDF_Object* pRV = FPDF_GetFieldAttr(m_pDict, "RV");
       if (!pRV && (csDValue == csValue)) {
         return FALSE;
       }
-      if (bNotify && m_pForm->m_pFormNotify != NULL) {
+      if (bNotify && m_pForm->m_pFormNotify) {
         int iRet = m_pForm->m_pFormNotify->BeforeValueChange(this, csDValue);
         if (iRet < 0) {
           return FALSE;
@@ -198,7 +198,7 @@ FX_BOOL CPDF_FormField::ResetField(FX_BOOL bNotify) {
           m_pDict->SetAt("RV", pCloneR);
         }
       }
-      if (bNotify && m_pForm->m_pFormNotify != NULL) {
+      if (bNotify && m_pForm->m_pFormNotify) {
         m_pForm->m_pFormNotify->AfterValueChange(this);
       }
       m_pForm->m_bUpdated = TRUE;
@@ -331,7 +331,7 @@ FX_BOOL CPDF_FormField::SetValue(const CFX_WideString& value,
     case Text:
     case ComboBox: {
       CFX_WideString csValue = value;
-      if (bNotify && m_pForm->m_pFormNotify != NULL) {
+      if (bNotify && m_pForm->m_pFormNotify) {
         int iRet = m_pForm->m_pFormNotify->BeforeValueChange(this, csValue);
         if (iRet < 0) {
           return FALSE;
@@ -353,7 +353,7 @@ FX_BOOL CPDF_FormField::SetValue(const CFX_WideString& value,
           SetItemSelection(iIndex, TRUE);
         }
       }
-      if (bNotify && m_pForm->m_pFormNotify != NULL) {
+      if (bNotify && m_pForm->m_pFormNotify) {
         m_pForm->m_pFormNotify->AfterValueChange(this);
       }
       m_pForm->m_bUpdated = TRUE;
@@ -366,7 +366,7 @@ FX_BOOL CPDF_FormField::SetValue(const CFX_WideString& value,
       if (bDefault && iIndex == GetDefaultSelectedItem()) {
         return FALSE;
       }
-      if (bNotify && m_pForm->m_pFormNotify != NULL) {
+      if (bNotify && m_pForm->m_pFormNotify) {
         CFX_WideString csValue = value;
         int iRet = m_pForm->m_pFormNotify->BeforeSelectionChange(this, csValue);
         if (iRet < 0) {
@@ -378,7 +378,7 @@ FX_BOOL CPDF_FormField::SetValue(const CFX_WideString& value,
         ClearSelection();
         SetItemSelection(iIndex, TRUE);
       }
-      if (bNotify && m_pForm->m_pFormNotify != NULL) {
+      if (bNotify && m_pForm->m_pFormNotify) {
         m_pForm->m_pFormNotify->AfterSelectionChange(this);
       }
       m_pForm->m_bUpdated = TRUE;
@@ -464,7 +464,7 @@ int CPDF_FormField::GetSelectedIndex(int index) {
   return -1;
 }
 FX_BOOL CPDF_FormField::ClearSelection(FX_BOOL bNotify) {
-  if (bNotify && m_pForm->m_pFormNotify != NULL) {
+  if (bNotify && m_pForm->m_pFormNotify) {
     int iRet = 0;
     CFX_WideString csValue;
     int iIndex = GetSelectedIndex(0);
@@ -483,7 +483,7 @@ FX_BOOL CPDF_FormField::ClearSelection(FX_BOOL bNotify) {
   }
   m_pDict->RemoveAt("V");
   m_pDict->RemoveAt("I");
-  if (bNotify && m_pForm->m_pFormNotify != NULL) {
+  if (bNotify && m_pForm->m_pFormNotify) {
     if (GetType() == ListBox) {
       m_pForm->m_pFormNotify->AfterSelectionChange(this);
     }
@@ -549,7 +549,7 @@ FX_BOOL CPDF_FormField::SetItemSelection(int index,
     return FALSE;
   }
   CFX_WideString opt_value = GetOptionValue(index);
-  if (bNotify && m_pForm->m_pFormNotify != NULL) {
+  if (bNotify && m_pForm->m_pFormNotify) {
     int iRet = 0;
     if (GetType() == ListBox) {
       iRet = m_pForm->m_pFormNotify->BeforeSelectionChange(this, opt_value);
@@ -563,7 +563,7 @@ FX_BOOL CPDF_FormField::SetItemSelection(int index,
   }
   if (!bSelected) {
     CPDF_Object* pValue = FPDF_GetFieldAttr(m_pDict, "V");
-    if (pValue != NULL) {
+    if (pValue) {
       if (m_Type == ListBox) {
         SelectOption(index, FALSE);
         if (pValue->IsString()) {
@@ -627,7 +627,7 @@ FX_BOOL CPDF_FormField::SetItemSelection(int index,
       m_pDict->SetAt("I", pI);
     }
   }
-  if (bNotify && m_pForm->m_pFormNotify != NULL) {
+  if (bNotify && m_pForm->m_pFormNotify) {
     if (GetType() == ListBox) {
       m_pForm->m_pFormNotify->AfterSelectionChange(this);
     }
@@ -745,7 +745,7 @@ FX_BOOL CPDF_FormField::CheckControl(int iControlIndex,
     return FALSE;
   }
   CFX_ByteArray statusArray;
-  if (bNotify && m_pForm->m_pFormNotify != NULL) {
+  if (bNotify && m_pForm->m_pFormNotify) {
     SaveCheckedFieldStatus(this, statusArray);
   }
   CFX_WideString csWExport = pControl->GetExportValue();
@@ -780,7 +780,7 @@ FX_BOOL CPDF_FormField::CheckControl(int iControlIndex,
     } else {
       CFX_ByteString csV;
       CPDF_Object* pV = FPDF_GetFieldAttr(m_pDict, "V");
-      if (pV != NULL) {
+      if (pV) {
         csV = pV->GetString();
       }
       if (csV == csBExport) {
@@ -792,7 +792,7 @@ FX_BOOL CPDF_FormField::CheckControl(int iControlIndex,
     csIndex.Format("%d", iControlIndex);
     m_pDict->SetAtName("V", csIndex);
   }
-  if (bNotify && m_pForm->m_pFormNotify != NULL) {
+  if (bNotify && m_pForm->m_pFormNotify) {
     m_pForm->m_pFormNotify->AfterCheckedStatusChange(this, statusArray);
   }
   m_pForm->m_bUpdated = TRUE;
@@ -822,7 +822,7 @@ FX_BOOL CPDF_FormField::SetCheckValue(const CFX_WideString& value,
                                       FX_BOOL bNotify) {
   ASSERT(GetType() == CheckBox || GetType() == RadioButton);
   CFX_ByteArray statusArray;
-  if (bNotify && m_pForm->m_pFormNotify != NULL) {
+  if (bNotify && m_pForm->m_pFormNotify) {
     SaveCheckedFieldStatus(this, statusArray);
   }
   int iCount = CountControls();
@@ -842,7 +842,7 @@ FX_BOOL CPDF_FormField::SetCheckValue(const CFX_WideString& value,
       }
     }
   }
-  if (bNotify && m_pForm->m_pFormNotify != NULL) {
+  if (bNotify && m_pForm->m_pFormNotify) {
     m_pForm->m_pFormNotify->AfterCheckedStatusChange(this, statusArray);
   }
   m_pForm->m_bUpdated = TRUE;
@@ -919,7 +919,7 @@ FX_BOOL CPDF_FormField::SelectOption(int iOptIndex,
       if (bSelected) {
         return TRUE;
       }
-      if (bNotify && m_pForm->m_pFormNotify != NULL) {
+      if (bNotify && m_pForm->m_pFormNotify) {
         int iRet = 0;
         CFX_WideString csValue = GetOptionLabel(iOptIndex);
         if (GetType() == ListBox) {
@@ -939,7 +939,7 @@ FX_BOOL CPDF_FormField::SelectOption(int iOptIndex,
       if (!bSelected) {
         continue;
       }
-      if (bNotify && m_pForm->m_pFormNotify != NULL) {
+      if (bNotify && m_pForm->m_pFormNotify) {
         int iRet = 0;
         CFX_WideString csValue = GetOptionLabel(iOptIndex);
         if (GetType() == ListBox) {
@@ -969,7 +969,7 @@ FX_BOOL CPDF_FormField::SelectOption(int iOptIndex,
       m_pDict->RemoveAt("I");
     }
   }
-  if (bNotify && m_pForm->m_pFormNotify != NULL) {
+  if (bNotify && m_pForm->m_pFormNotify) {
     if (GetType() == ListBox) {
       m_pForm->m_pFormNotify->AfterSelectionChange(this);
     }
@@ -981,7 +981,7 @@ FX_BOOL CPDF_FormField::SelectOption(int iOptIndex,
   return TRUE;
 }
 FX_BOOL CPDF_FormField::ClearSelectedOptions(FX_BOOL bNotify) {
-  if (bNotify && m_pForm->m_pFormNotify != NULL) {
+  if (bNotify && m_pForm->m_pFormNotify) {
     int iRet = 0;
     CFX_WideString csValue;
     int iIndex = GetSelectedIndex(0);
@@ -999,7 +999,7 @@ FX_BOOL CPDF_FormField::ClearSelectedOptions(FX_BOOL bNotify) {
     }
   }
   m_pDict->RemoveAt("I");
-  if (bNotify && m_pForm->m_pFormNotify != NULL) {
+  if (bNotify && m_pForm->m_pFormNotify) {
     if (GetType() == ListBox) {
       m_pForm->m_pFormNotify->AfterSelectionChange(this);
     }
diff --git a/core/src/fpdfdoc/doc_ocg.cpp b/core/src/fpdfdoc/doc_ocg.cpp
index 4e0e1c5a31..cfca121d36 100644
--- a/core/src/fpdfdoc/doc_ocg.cpp
+++ b/core/src/fpdfdoc/doc_ocg.cpp
@@ -24,7 +24,6 @@ static int32_t FPDFDOC_OCG_FindGroup(const CPDF_Object* pObject,
 static FX_BOOL FPDFDOC_OCG_HasIntent(const CPDF_Dictionary* pDict,
                                      const CFX_ByteStringC& csElement,
                                      const CFX_ByteStringC& csDef = "") {
-  FXSYS_assert(pDict != NULL);
   CPDF_Object* pIntent = pDict->GetElementValue("Intent");
   if (pIntent == NULL) {
     return csElement == csDef;
@@ -89,7 +88,7 @@ static CFX_ByteString FPDFDOC_OCG_GetUsageTypeString(
   return csState;
 }
 CPDF_OCContext::CPDF_OCContext(CPDF_Document* pDoc, UsageType eUsageType) {
-  FXSYS_assert(pDoc != NULL);
+  FXSYS_assert(pDoc);
   m_pDocument = pDoc;
   m_eUsageType = eUsageType;
 }
@@ -235,9 +234,8 @@ FX_BOOL CPDF_OCContext::GetOCGVE(CPDF_Array* pExpression,
 }
 FX_BOOL CPDF_OCContext::LoadOCMDState(const CPDF_Dictionary* pOCMDDict,
                                       FX_BOOL bFromConfig) {
-  FXSYS_assert(pOCMDDict != NULL);
   CPDF_Array* pVE = pOCMDDict->GetArray("VE");
-  if (pVE != NULL) {
+  if (pVE) {
     return GetOCGVE(pVE, bFromConfig);
   }
   CFX_ByteString csP = pOCMDDict->GetString("P", "AnyOn");
diff --git a/core/src/fpdfdoc/doc_utils.cpp b/core/src/fpdfdoc/doc_utils.cpp
index adf523f74e..f26355fae5 100644
--- a/core/src/fpdfdoc/doc_utils.cpp
+++ b/core/src/fpdfdoc/doc_utils.cpp
@@ -242,7 +242,7 @@ void InitInterFormDict(CPDF_Dictionary*& pFormDict, CPDF_Document* pDocument) {
     CFX_ByteString csBaseName, csDefault;
     uint8_t charSet = CPDF_InterForm::GetNativeCharSet();
     pFont = CPDF_InterForm::AddStandardFont(pDocument, "Helvetica");
-    if (pFont != NULL) {
+    if (pFont) {
       AddInterFormFont(pFormDict, pDocument, pFont, csBaseName);
       csDefault = csBaseName;
     }
@@ -250,14 +250,14 @@ void InitInterFormDict(CPDF_Dictionary*& pFormDict, CPDF_Document* pDocument) {
       CFX_ByteString csFontName = CPDF_InterForm::GetNativeFont(charSet, NULL);
       if (pFont == NULL || csFontName != "Helvetica") {
         pFont = CPDF_InterForm::AddNativeFont(pDocument);
-        if (pFont != NULL) {
+        if (pFont) {
           csBaseName = "";
           AddInterFormFont(pFormDict, pDocument, pFont, csBaseName);
           csDefault = csBaseName;
         }
       }
     }
-    if (pFont != NULL) {
+    if (pFont) {
       csDA = "/" + PDF_NameEncode(csDefault) + " 0 Tf";
     }
   }
@@ -452,9 +452,9 @@ CPDF_Font* GetNativeInterFormFont(CPDF_Dictionary* pFormDict,
   uint8_t charSet = CPDF_InterForm::GetNativeCharSet();
   CFX_SubstFont* pSubst;
   CPDF_Font* pFont = GetDefaultInterFormFont(pFormDict, pDocument);
-  if (pFont != NULL) {
+  if (pFont) {
     pSubst = (CFX_SubstFont*)pFont->GetSubstFont();
-    if (pSubst != NULL && pSubst->m_Charset == (int)charSet) {
+    if (pSubst && pSubst->m_Charset == (int)charSet) {
       FindInterFormFont(pFormDict, pFont, csNameTag);
       return pFont;
     }
@@ -592,7 +592,7 @@ CPDF_Font* AddNativeInterFormFont(CPDF_Dictionary*& pFormDict,
   CFX_ByteString csTemp;
   CPDF_Font* pFont =
       GetNativeInterFormFont(pFormDict, pDocument, charSet, csTemp);
-  if (pFont != NULL) {
+  if (pFont) {
     csNameTag = csTemp;
     return pFont;
   }
@@ -603,7 +603,7 @@ CPDF_Font* AddNativeInterFormFont(CPDF_Dictionary*& pFormDict,
     }
   }
   pFont = CPDF_InterForm::AddNativeFont(charSet, pDocument);
-  if (pFont != NULL) {
+  if (pFont) {
     AddInterFormFont(pFormDict, pDocument, pFont, csNameTag);
   }
   return pFont;
@@ -679,7 +679,7 @@ void CPDF_IconFit::GetIconPosition(FX_FLOAT& fLeft, FX_FLOAT& fBottom) {
     return;
   }
   CPDF_Array* pA = m_pDict->GetArray("A");
-  if (pA != NULL) {
+  if (pA) {
     FX_DWORD dwCount = pA->GetCount();
     if (dwCount > 0) {
       fLeft = pA->GetNumber(0);
diff --git a/core/src/fpdfdoc/doc_vt.cpp b/core/src/fpdfdoc/doc_vt.cpp
index 07824e8f04..8df687ed59 100644
--- a/core/src/fpdfdoc/doc_vt.cpp
+++ b/core/src/fpdfdoc/doc_vt.cpp
@@ -84,7 +84,6 @@ CPVT_WordPlace CSection::AddLine(const CPVT_LineInfo& lineinfo) {
   return CPVT_WordPlace(SecPlace.nSecIndex, m_LineArray.Add(lineinfo), -1);
 }
 CPVT_FloatRect CSection::Rearrange() {
-  ASSERT(m_pVT != NULL);
   if (m_pVT->m_nCharArray > 0) {
     return CTypeset(this).CharArray();
   }
@@ -166,7 +165,7 @@ void CSection::UpdateWordPlace(CPVT_WordPlace& place) const {
   }
 }
 CPVT_WordPlace CSection::SearchWordPlace(const CPDF_Point& point) const {
-  ASSERT(m_pVT != NULL);
+  ASSERT(m_pVT);
   CPVT_WordPlace place = GetBeginWordPlace();
   FX_BOOL bUp = TRUE;
   FX_BOOL bDown = TRUE;
@@ -306,8 +305,7 @@ CTypeset::CTypeset(CSection* pSection)
       m_pSection(pSection) {}
 CTypeset::~CTypeset() {}
 CPVT_FloatRect CTypeset::CharArray() {
-  ASSERT(m_pSection != NULL);
-  ASSERT(m_pVT != NULL);
+  ASSERT(m_pSection);
   FX_FLOAT fLineAscent =
       m_pVT->GetFontAscent(m_pVT->GetDefaultFontIndex(), m_pVT->GetFontSize());
   FX_FLOAT fLineDescent =
@@ -382,14 +380,13 @@ CPVT_FloatRect CTypeset::CharArray() {
   return m_rcRet = CPVT_FloatRect(0, 0, x, y);
 }
 CPVT_Size CTypeset::GetEditSize(FX_FLOAT fFontSize) {
-  ASSERT(m_pSection != NULL);
-  ASSERT(m_pVT != NULL);
+  ASSERT(m_pSection);
+  ASSERT(m_pVT);
   SplitLines(FALSE, fFontSize);
   return CPVT_Size(m_rcRet.Width(), m_rcRet.Height());
 }
 CPVT_FloatRect CTypeset::Typeset() {
-  ASSERT(m_pSection != NULL);
-  ASSERT(m_pVT != NULL);
+  ASSERT(m_pVT);
   m_pSection->m_LineArray.Empty();
   SplitLines(TRUE, 0.0f);
   m_pSection->m_LineArray.Clear();
@@ -571,8 +568,8 @@ static FX_BOOL NeedDivision(FX_WORD prevWord, FX_WORD curWord) {
   return FALSE;
 }
 void CTypeset::SplitLines(FX_BOOL bTypeset, FX_FLOAT fFontSize) {
-  ASSERT(m_pVT != NULL);
-  ASSERT(m_pSection != NULL);
+  ASSERT(m_pVT);
+  ASSERT(m_pSection);
   int32_t nLineHead = 0;
   int32_t nLineTail = 0;
   FX_FLOAT fMaxX = 0.0f, fMaxY = 0.0f;
@@ -619,7 +616,7 @@ void CTypeset::SplitLines(FX_BOOL bTypeset, FX_FLOAT fFontSize) {
           if (IsOpenStylePunctuation(pWord->Word)) {
             bOpened = TRUE;
             bFullWord = TRUE;
-          } else if (pOldWord != NULL) {
+          } else if (pOldWord) {
             if (NeedDivision(pOldWord->Word, pWord->Word)) {
               bFullWord = TRUE;
             }
@@ -718,8 +715,8 @@ void CTypeset::SplitLines(FX_BOOL bTypeset, FX_FLOAT fFontSize) {
   m_rcRet = CPVT_FloatRect(0, 0, fMaxX, fMaxY);
 }
 void CTypeset::OutputLines() {
-  ASSERT(m_pVT != NULL);
-  ASSERT(m_pSection != NULL);
+  ASSERT(m_pVT);
+  ASSERT(m_pSection);
   FX_FLOAT fMinX = 0.0f, fMinY = 0.0f, fMaxX = 0.0f, fMaxY = 0.0f;
   FX_FLOAT fPosX = 0.0f, fPosY = 0.0f;
   FX_FLOAT fLineIndent = m_pVT->GetLineIndent(m_pSection->m_SecInfo);
@@ -1677,11 +1674,10 @@ CPDF_VariableText_Iterator::CPDF_VariableText_Iterator(CPDF_VariableText* pVT)
     : m_CurPos(-1, -1, -1), m_pVT(pVT) {}
 CPDF_VariableText_Iterator::~CPDF_VariableText_Iterator() {}
 void CPDF_VariableText_Iterator::SetAt(int32_t nWordIndex) {
-  ASSERT(m_pVT != NULL);
   m_CurPos = m_pVT->WordIndexToWordPlace(nWordIndex);
 }
 void CPDF_VariableText_Iterator::SetAt(const CPVT_WordPlace& place) {
-  ASSERT(m_pVT != NULL);
+  ASSERT(m_pVT);
   m_CurPos = place;
 }
 FX_BOOL CPDF_VariableText_Iterator::NextWord() {
@@ -1738,7 +1734,7 @@ FX_BOOL CPDF_VariableText_Iterator::NextSection() {
   return FALSE;
 }
 FX_BOOL CPDF_VariableText_Iterator::PrevSection() {
-  ASSERT(m_pVT != NULL);
+  ASSERT(m_pVT);
   if (m_CurPos.nSecIndex > 0) {
     m_CurPos = CPVT_WordPlace(m_CurPos.nSecIndex - 1, 0, -1);
     return TRUE;
@@ -1746,7 +1742,6 @@ FX_BOOL CPDF_VariableText_Iterator::PrevSection() {
   return FALSE;
 }
 FX_BOOL CPDF_VariableText_Iterator::GetWord(CPVT_Word& word) const {
-  ASSERT(m_pVT != NULL);
   word.WordPlace = m_CurPos;
   if (CSection* pSection = m_pVT->m_SectionArray.GetAt(m_CurPos.nSecIndex)) {
     if (pSection->m_LineArray.GetAt(m_CurPos.nLineIndex)) {
@@ -1772,7 +1767,6 @@ FX_BOOL CPDF_VariableText_Iterator::GetWord(CPVT_Word& word) const {
   return FALSE;
 }
 FX_BOOL CPDF_VariableText_Iterator::SetWord(const CPVT_Word& word) {
-  ASSERT(m_pVT != NULL);
   if (CSection* pSection = m_pVT->m_SectionArray.GetAt(m_CurPos.nSecIndex)) {
     if (CPVT_WordInfo* pWord =
             pSection->m_WordArray.GetAt(m_CurPos.nWordIndex)) {
@@ -1785,7 +1779,7 @@ FX_BOOL CPDF_VariableText_Iterator::SetWord(const CPVT_Word& word) {
   return FALSE;
 }
 FX_BOOL CPDF_VariableText_Iterator::GetLine(CPVT_Line& line) const {
-  ASSERT(m_pVT != NULL);
+  ASSERT(m_pVT);
   line.lineplace = CPVT_WordPlace(m_CurPos.nSecIndex, m_CurPos.nLineIndex, -1);
   if (CSection* pSection = m_pVT->m_SectionArray.GetAt(m_CurPos.nSecIndex)) {
     if (CLine* pLine = pSection->m_LineArray.GetAt(m_CurPos.nLineIndex)) {
@@ -1802,7 +1796,6 @@ FX_BOOL CPDF_VariableText_Iterator::GetLine(CPVT_Line& line) const {
   return FALSE;
 }
 FX_BOOL CPDF_VariableText_Iterator::GetSection(CPVT_Section& section) const {
-  ASSERT(m_pVT != NULL);
   section.secplace = CPVT_WordPlace(m_CurPos.nSecIndex, 0, -1);
   if (CSection* pSection = m_pVT->m_SectionArray.GetAt(m_CurPos.nSecIndex)) {
     section.rcSection = m_pVT->InToOut(pSection->m_SecInfo.rcSection);
@@ -1817,7 +1810,6 @@ FX_BOOL CPDF_VariableText_Iterator::GetSection(CPVT_Section& section) const {
   return FALSE;
 }
 FX_BOOL CPDF_VariableText_Iterator::SetSection(const CPVT_Section& section) {
-  ASSERT(m_pVT != NULL);
   if (CSection* pSection = m_pVT->m_SectionArray.GetAt(m_CurPos.nSecIndex)) {
     if (pSection->m_SecInfo.pSecProps) {
       *pSection->m_SecInfo.pSecProps = section.SecProps;
diff --git a/core/src/fxcodec/codec/fx_codec_jpeg.cpp b/core/src/fxcodec/codec/fx_codec_jpeg.cpp
index 1bee5e774a..730872363c 100644
--- a/core/src/fxcodec/codec/fx_codec_jpeg.cpp
+++ b/core/src/fxcodec/codec/fx_codec_jpeg.cpp
@@ -282,10 +282,10 @@ static FX_BOOL _JpegLoadInfo(const uint8_t* src_buf,
   color_transform =
       cinfo.jpeg_color_space == JCS_YCbCr || cinfo.jpeg_color_space == JCS_YCCK;
   bits_per_components = cinfo.data_precision;
-  if (icc_buf_ptr != NULL) {
+  if (icc_buf_ptr) {
     *icc_buf_ptr = NULL;
   }
-  if (icc_length != NULL) {
+  if (icc_length) {
     *icc_length = 0;
   }
   jpeg_destroy_decompress(&cinfo);
@@ -531,7 +531,7 @@ FX_BOOL CCodec_JpegModule::Encode(const CFX_DIBSource* pSource,
                                   int quality,
                                   const uint8_t* icc_buf,
                                   FX_DWORD icc_length) {
-  if (pSource->GetBPP() < 8 || pSource->GetPalette() != NULL) {
+  if (pSource->GetBPP() < 8 || pSource->GetPalette()) {
     ASSERT(pSource->GetBPP() >= 8 && pSource->GetPalette() == NULL);
     return FALSE;
   }
@@ -655,7 +655,7 @@ FX_BOOL CCodec_JpegModule::ReadScanline(void* pContext,
 }
 FX_DWORD CCodec_JpegModule::GetAvailInput(void* pContext,
                                           uint8_t** avail_buf_ptr) {
-  if (avail_buf_ptr != NULL) {
+  if (avail_buf_ptr) {
     *avail_buf_ptr = NULL;
     if (((FXJPEG_Context*)pContext)->m_SrcMgr.bytes_in_buffer > 0) {
       *avail_buf_ptr =
diff --git a/core/src/fxcrt/fx_basic_bstring.cpp b/core/src/fxcrt/fx_basic_bstring.cpp
index 7576ab86eb..cd4770282a 100644
--- a/core/src/fxcrt/fx_basic_bstring.cpp
+++ b/core/src/fxcrt/fx_basic_bstring.cpp
@@ -295,7 +295,7 @@ void CFX_ByteString::CopyBeforeWrite() {
   m_pData->Release();
   FX_STRSIZE nDataLength = pData->m_nDataLength;
   m_pData = StringData::Create(nDataLength);
-  if (m_pData != NULL) {
+  if (m_pData) {
     FXSYS_memcpy(m_pData->m_String, pData->m_String, nDataLength + 1);
   }
 }
@@ -698,7 +698,7 @@ FX_STRSIZE CFX_ByteString::Insert(FX_STRSIZE nIndex, FX_CHAR ch) {
     if (!m_pData) {
       return 0;
     }
-    if (pOldData != NULL) {
+    if (pOldData) {
       FXSYS_memmove(m_pData->m_String, pstr, (pOldData->m_nDataLength + 1));
       pOldData->Release();
     } else {
diff --git a/core/src/fxcrt/fx_basic_buffer.cpp b/core/src/fxcrt/fx_basic_buffer.cpp
index 3228ca3e7a..548581c9cb 100644
--- a/core/src/fxcrt/fx_basic_buffer.cpp
+++ b/core/src/fxcrt/fx_basic_buffer.cpp
@@ -151,7 +151,7 @@ void CFX_WideTextBuf::AppendChar(FX_WCHAR ch) {
   if (m_AllocSize < m_DataSize + (FX_STRSIZE)sizeof(FX_WCHAR)) {
     ExpandBuf(sizeof(FX_WCHAR));
   }
-  ASSERT(m_pBuffer != NULL);
+  ASSERT(m_pBuffer);
   *(FX_WCHAR*)(m_pBuffer + m_DataSize) = ch;
   m_DataSize += sizeof(FX_WCHAR);
 }
@@ -170,7 +170,7 @@ CFX_WideTextBuf& CFX_WideTextBuf::operator<<(int i) {
   if (m_AllocSize < m_DataSize + (FX_STRSIZE)(len * sizeof(FX_WCHAR))) {
     ExpandBuf(len * sizeof(FX_WCHAR));
   }
-  ASSERT(m_pBuffer != NULL);
+  ASSERT(m_pBuffer);
   FX_WCHAR* str = (FX_WCHAR*)(m_pBuffer + m_DataSize);
   for (FX_STRSIZE j = 0; j < len; j++) {
     *str++ = buf[j];
@@ -184,7 +184,7 @@ CFX_WideTextBuf& CFX_WideTextBuf::operator<<(double f) {
   if (m_AllocSize < m_DataSize + (FX_STRSIZE)(len * sizeof(FX_WCHAR))) {
     ExpandBuf(len * sizeof(FX_WCHAR));
   }
-  ASSERT(m_pBuffer != NULL);
+  ASSERT(m_pBuffer);
   FX_WCHAR* str = (FX_WCHAR*)(m_pBuffer + m_DataSize);
   for (FX_STRSIZE i = 0; i < len; i++) {
     *str++ = buf[i];
diff --git a/core/src/fxcrt/fx_basic_list.cpp b/core/src/fxcrt/fx_basic_list.cpp
index de5d9f3269..292e2a7b53 100644
--- a/core/src/fxcrt/fx_basic_list.cpp
+++ b/core/src/fxcrt/fx_basic_list.cpp
@@ -17,7 +17,7 @@ CFX_PtrList::CFX_PtrList(int nBlockSize)
 FX_POSITION CFX_PtrList::AddTail(void* newElement) {
   CNode* pNewNode = NewNode(m_pNodeTail, NULL);
   pNewNode->data = newElement;
-  if (m_pNodeTail != NULL) {
+  if (m_pNodeTail) {
     m_pNodeTail->pNext = pNewNode;
   } else {
     m_pNodeHead = pNewNode;
@@ -28,7 +28,7 @@ FX_POSITION CFX_PtrList::AddTail(void* newElement) {
 FX_POSITION CFX_PtrList::AddHead(void* newElement) {
   CNode* pNewNode = NewNode(NULL, m_pNodeHead);
   pNewNode->data = newElement;
-  if (m_pNodeHead != NULL) {
+  if (m_pNodeHead) {
     m_pNodeHead->pPrev = pNewNode;
   } else {
     m_pNodeTail = pNewNode;
@@ -43,7 +43,7 @@ FX_POSITION CFX_PtrList::InsertAfter(FX_POSITION position, void* newElement) {
   CNode* pOldNode = (CNode*)position;
   CNode* pNewNode = NewNode(pOldNode, pOldNode->pNext);
   pNewNode->data = newElement;
-  if (pOldNode->pNext != NULL) {
+  if (pOldNode->pNext) {
     pOldNode->pNext->pPrev = pNewNode;
   } else {
     m_pNodeTail = pNewNode;
@@ -91,7 +91,6 @@ CFX_PtrList::CNode* CFX_PtrList::NewNode(CFX_PtrList::CNode* pPrev,
       m_pNodeFree = pNode;
     }
   }
-  ASSERT(m_pNodeFree != NULL);
   CFX_PtrList::CNode* pNode = m_pNodeFree;
   m_pNodeFree = m_pNodeFree->pNext;
   pNode->pPrev = pPrev;
@@ -122,9 +121,9 @@ FX_POSITION CFX_PtrList::Find(void* searchValue, FX_POSITION startAfter) const {
   } else {
     pNode = pNode->pNext;
   }
-  for (; pNode != NULL; pNode = pNode->pNext)
-    if (pNode->data == searchValue) {
+  for (; pNode; pNode = pNode->pNext) {
+    if (pNode->data == searchValue)
       return (FX_POSITION)pNode;
-    }
+  }
   return NULL;
 }
diff --git a/core/src/fxcrt/fx_basic_maps.cpp b/core/src/fxcrt/fx_basic_maps.cpp
index aadeb15cb4..f8751ae340 100644
--- a/core/src/fxcrt/fx_basic_maps.cpp
+++ b/core/src/fxcrt/fx_basic_maps.cpp
@@ -34,15 +34,15 @@ FX_DWORD CFX_MapPtrToPtr::HashKey(void* key) const {
 void CFX_MapPtrToPtr::GetNextAssoc(FX_POSITION& rNextPosition,
                                    void*& rKey,
                                    void*& rValue) const {
-  ASSERT(m_pHashTable != NULL);
+  ASSERT(m_pHashTable);
   CAssoc* pAssocRet = (CAssoc*)rNextPosition;
-  ASSERT(pAssocRet != NULL);
+  ASSERT(pAssocRet);
   if (pAssocRet == (CAssoc*)-1) {
-    for (FX_DWORD nBucket = 0; nBucket < m_nHashTableSize; nBucket++)
-      if ((pAssocRet = m_pHashTable[nBucket]) != NULL) {
+    for (FX_DWORD nBucket = 0; nBucket < m_nHashTableSize; nBucket++) {
+      if ((pAssocRet = m_pHashTable[nBucket]) != NULL)
         break;
-      }
-    ASSERT(pAssocRet != NULL);
+    }
+    ASSERT(pAssocRet);
   }
   CAssoc* pAssocNext;
   if ((pAssocNext = pAssocRet->pNext) == NULL) {
@@ -95,10 +95,9 @@ CFX_MapPtrToPtr::CAssoc* CFX_MapPtrToPtr::GetAssocAt(void* key,
     return NULL;
   }
   CAssoc* pAssoc;
-  for (pAssoc = m_pHashTable[nHash]; pAssoc != NULL; pAssoc = pAssoc->pNext) {
-    if (pAssoc->key == key) {
+  for (pAssoc = m_pHashTable[nHash]; pAssoc; pAssoc = pAssoc->pNext) {
+    if (pAssoc->key == key)
       return pAssoc;
-    }
   }
   return NULL;
 }
@@ -114,7 +113,6 @@ CFX_MapPtrToPtr::CAssoc* CFX_MapPtrToPtr::NewAssoc() {
       m_pFreeList = pAssoc;
     }
   }
-  ASSERT(m_pFreeList != NULL);
   CFX_MapPtrToPtr::CAssoc* pAssoc = m_pFreeList;
   m_pFreeList = m_pFreeList->pNext;
   m_nCount++;
@@ -140,7 +138,7 @@ FX_BOOL CFX_MapPtrToPtr::RemoveKey(void* key) {
   CAssoc** ppAssocPrev;
   ppAssocPrev = &m_pHashTable[HashKey(key) % m_nHashTableSize];
   CAssoc* pAssoc;
-  for (pAssoc = *ppAssocPrev; pAssoc != NULL; pAssoc = pAssoc->pNext) {
+  for (pAssoc = *ppAssocPrev; pAssoc; pAssoc = pAssoc->pNext) {
     if (pAssoc->key == key) {
       *ppAssocPrev = pAssoc->pNext;
       FreeAssoc(pAssoc);
@@ -293,10 +291,10 @@ FX_BOOL CFX_CMapByteStringToPtr::Lookup(const CFX_ByteStringC& key,
   return TRUE;
 }
 void CFX_CMapByteStringToPtr::SetAt(const CFX_ByteStringC& key, void* value) {
-  ASSERT(value != NULL);
-  int index, key_len = key.GetLength();
+  ASSERT(value);
+  int key_len = key.GetLength();
   int size = m_Buffer.GetSize();
-  for (index = 0; index < size; index++) {
+  for (int index = 0; index < size; index++) {
     _CompactString* pKey = (_CompactString*)m_Buffer.GetAt(index);
     if (!_CompactStringSame(pKey, key.GetPtr(), key_len)) {
       continue;
@@ -304,7 +302,7 @@ void CFX_CMapByteStringToPtr::SetAt(const CFX_ByteStringC& key, void* value) {
     *(void**)(pKey + 1) = value;
     return;
   }
-  for (index = 0; index < size; index++) {
+  for (int index = 0; index < size; index++) {
     _CompactString* pKey = (_CompactString*)m_Buffer.GetAt(index);
     if (pKey->m_CompactLen) {
       continue;
@@ -319,7 +317,7 @@ void CFX_CMapByteStringToPtr::SetAt(const CFX_ByteStringC& key, void* value) {
 }
 void CFX_CMapByteStringToPtr::AddValue(const CFX_ByteStringC& key,
                                        void* value) {
-  ASSERT(value != NULL);
+  ASSERT(value);
   _CompactString* pKey = (_CompactString*)m_Buffer.Add();
   _CompactStringStore(pKey, key.GetPtr(), key.GetLength());
   *(void**)(pKey + 1) = value;
diff --git a/core/src/fxcrt/fx_basic_plex.cpp b/core/src/fxcrt/fx_basic_plex.cpp
index b6383ecf20..91cc1313bd 100644
--- a/core/src/fxcrt/fx_basic_plex.cpp
+++ b/core/src/fxcrt/fx_basic_plex.cpp
@@ -18,10 +18,9 @@ CFX_Plex* CFX_Plex::Create(CFX_Plex*& pHead,
 }
 void CFX_Plex::FreeDataChain() {
   CFX_Plex* p = this;
-  while (p != NULL) {
-    uint8_t* bytes = (uint8_t*)p;
-    CFX_Plex* pNext = p->pNext;
-    FX_Free(bytes);
-    p = pNext;
+  while (p) {
+    CFX_Plex* old = p;
+    p = p->pNext;
+    FX_Free(old);
   }
 }
diff --git a/core/src/fxcrt/fx_basic_utf.cpp b/core/src/fxcrt/fx_basic_utf.cpp
index 749e1226d3..3625feb130 100644
--- a/core/src/fxcrt/fx_basic_utf.cpp
+++ b/core/src/fxcrt/fx_basic_utf.cpp
@@ -74,7 +74,7 @@ void CFX_UTF8Encoder::Input(FX_WCHAR unicode) {
   }
 }
 CFX_ByteString FX_UTF8Encode(const FX_WCHAR* pwsStr, FX_STRSIZE len) {
-  FXSYS_assert(pwsStr != NULL);
+  FXSYS_assert(pwsStr);
   if (len < 0) {
     len = FXSYS_wcslen(pwsStr);
   }
diff --git a/core/src/fxcrt/fx_basic_wstring.cpp b/core/src/fxcrt/fx_basic_wstring.cpp
index 78746e383c..a3de140e8b 100644
--- a/core/src/fxcrt/fx_basic_wstring.cpp
+++ b/core/src/fxcrt/fx_basic_wstring.cpp
@@ -258,7 +258,7 @@ void CFX_WideString::CopyBeforeWrite() {
   m_pData->Release();
   FX_STRSIZE nDataLength = pData->m_nDataLength;
   m_pData = StringData::Create(nDataLength);
-  if (m_pData != NULL) {
+  if (m_pData) {
     FXSYS_memcpy(m_pData->m_String, pData->m_String,
                  (nDataLength + 1) * sizeof(FX_WCHAR));
   }
@@ -540,7 +540,7 @@ FX_STRSIZE CFX_WideString::Find(FX_WCHAR ch, FX_STRSIZE nStart) const {
   return (lpsz == NULL) ? -1 : (int)(lpsz - m_pData->m_String);
 }
 void CFX_WideString::TrimRight(const FX_WCHAR* lpszTargetList) {
-  FXSYS_assert(lpszTargetList != NULL);
+  FXSYS_assert(lpszTargetList);
   if (m_pData == NULL || *lpszTargetList == 0) {
     return;
   }
@@ -569,7 +569,7 @@ void CFX_WideString::TrimRight() {
   TrimRight(L"\x09\x0a\x0b\x0c\x0d\x20");
 }
 void CFX_WideString::TrimLeft(const FX_WCHAR* lpszTargets) {
-  FXSYS_assert(lpszTargets != NULL);
+  FXSYS_assert(lpszTargets);
   if (m_pData == NULL || *lpszTargets == 0) {
     return;
   }
@@ -617,7 +617,7 @@ FX_STRSIZE CFX_WideString::Replace(const FX_WCHAR* lpszOld,
   FX_WCHAR* lpszEnd = m_pData->m_String + m_pData->m_nDataLength;
   FX_WCHAR* lpszTarget;
   {
-    while ((lpszTarget = (FX_WCHAR*)FXSYS_wcsstr(lpszStart, lpszOld)) != NULL &&
+    while ((lpszTarget = (FX_WCHAR*)FXSYS_wcsstr(lpszStart, lpszOld)) &&
            lpszStart < lpszEnd) {
       nCount++;
       lpszStart = lpszTarget + nSourceLen;
@@ -678,7 +678,7 @@ FX_STRSIZE CFX_WideString::Insert(FX_STRSIZE nIndex, FX_WCHAR ch) {
     if (!m_pData) {
       return 0;
     }
-    if (pOldData != NULL) {
+    if (pOldData) {
       FXSYS_memmove(m_pData->m_String, pstr,
                     (pOldData->m_nDataLength + 1) * sizeof(FX_WCHAR));
       pOldData->Release();
diff --git a/core/src/fxcrt/fx_extension.cpp b/core/src/fxcrt/fx_extension.cpp
index 37437ae9ed..da936f37fd 100644
--- a/core/src/fxcrt/fx_extension.cpp
+++ b/core/src/fxcrt/fx_extension.cpp
@@ -61,7 +61,7 @@ FX_FLOAT FXSYS_logb(FX_FLOAT b, FX_FLOAT x) {
 FX_FLOAT FXSYS_strtof(const FX_CHAR* pcsStr,
                       int32_t iLength,
                       int32_t* pUsedLen) {
-  FXSYS_assert(pcsStr != NULL);
+  FXSYS_assert(pcsStr);
   if (iLength < 0) {
     iLength = (int32_t)FXSYS_strlen(pcsStr);
   }
@@ -71,7 +71,7 @@ FX_FLOAT FXSYS_strtof(const FX_CHAR* pcsStr,
 FX_FLOAT FXSYS_wcstof(const FX_WCHAR* pwsStr,
                       int32_t iLength,
                       int32_t* pUsedLen) {
-  FXSYS_assert(pwsStr != NULL);
+  FXSYS_assert(pwsStr);
   if (iLength < 0) {
     iLength = (int32_t)FXSYS_wcslen(pwsStr);
   }
@@ -117,7 +117,7 @@ FX_FLOAT FXSYS_wcstof(const FX_WCHAR* pwsStr,
 FX_WCHAR* FXSYS_wcsncpy(FX_WCHAR* dstStr,
                         const FX_WCHAR* srcStr,
                         size_t count) {
-  FXSYS_assert(dstStr != NULL && srcStr != NULL && count > 0);
+  FXSYS_assert(dstStr && srcStr && count > 0);
   for (size_t i = 0; i < count; ++i)
     if ((dstStr[i] = srcStr[i]) == L'\0') {
       break;
@@ -125,7 +125,7 @@ FX_WCHAR* FXSYS_wcsncpy(FX_WCHAR* dstStr,
   return dstStr;
 }
 int32_t FXSYS_wcsnicmp(const FX_WCHAR* s1, const FX_WCHAR* s2, size_t count) {
-  FXSYS_assert(s1 != NULL && s2 != NULL && count > 0);
+  FXSYS_assert(s1 && s2 && count > 0);
   FX_WCHAR wch1 = 0, wch2 = 0;
   while (count-- > 0) {
     wch1 = (FX_WCHAR)FXSYS_tolower(*s1++);
@@ -137,7 +137,7 @@ int32_t FXSYS_wcsnicmp(const FX_WCHAR* s1, const FX_WCHAR* s2, size_t count) {
   return wch1 - wch2;
 }
 int32_t FXSYS_strnicmp(const FX_CHAR* s1, const FX_CHAR* s2, size_t count) {
-  FXSYS_assert(s1 != NULL && s2 != NULL && count > 0);
+  FXSYS_assert(s1 && s2 && count > 0);
   FX_CHAR ch1 = 0, ch2 = 0;
   while (count-- > 0) {
     ch1 = (FX_CHAR)FXSYS_tolower(*s1++);
@@ -151,7 +151,7 @@ int32_t FXSYS_strnicmp(const FX_CHAR* s1, const FX_CHAR* s2, size_t count) {
 FX_DWORD FX_HashCode_String_GetA(const FX_CHAR* pStr,
                                  int32_t iLength,
                                  FX_BOOL bIgnoreCase) {
-  FXSYS_assert(pStr != NULL);
+  FXSYS_assert(pStr);
   if (iLength < 0) {
     iLength = (int32_t)FXSYS_strlen(pStr);
   }
@@ -171,7 +171,7 @@ FX_DWORD FX_HashCode_String_GetA(const FX_CHAR* pStr,
 FX_DWORD FX_HashCode_String_GetW(const FX_WCHAR* pStr,
                                  int32_t iLength,
                                  FX_BOOL bIgnoreCase) {
-  FXSYS_assert(pStr != NULL);
+  FXSYS_assert(pStr);
   if (iLength < 0) {
     iLength = (int32_t)FXSYS_wcslen(pStr);
   }
@@ -201,7 +201,7 @@ void* FX_Random_MT_Start(FX_DWORD dwSeed) {
   return pContext;
 }
 FX_DWORD FX_Random_MT_Generate(void* pContext) {
-  FXSYS_assert(pContext != NULL);
+  FXSYS_assert(pContext);
   FX_LPMTRANDOMCONTEXT pMTC = (FX_LPMTRANDOMCONTEXT)pContext;
   FX_DWORD v;
   static FX_DWORD mag[2] = {0, MT_Matrix_A};
@@ -232,7 +232,7 @@ FX_DWORD FX_Random_MT_Generate(void* pContext) {
   return v;
 }
 void FX_Random_MT_Close(void* pContext) {
-  FXSYS_assert(pContext != NULL);
+  FXSYS_assert(pContext);
   FX_Free(pContext);
 }
 void FX_Random_GenerateMT(FX_DWORD* pBuffer, int32_t iCount) {
diff --git a/core/src/fxcrt/fx_xml_parser.cpp b/core/src/fxcrt/fx_xml_parser.cpp
index dcae0c58c0..56fbada3ad 100644
--- a/core/src/fxcrt/fx_xml_parser.cpp
+++ b/core/src/fxcrt/fx_xml_parser.cpp
@@ -819,7 +819,6 @@ int CXML_AttrMap::GetSize() const {
   return m_pMap == NULL ? 0 : m_pMap->GetSize();
 }
 CXML_AttrItem& CXML_AttrMap::GetAt(int index) const {
-  ASSERT(m_pMap != NULL);
   return (*m_pMap)[index];
 }
 void CXML_AttrMap::RemoveAll() {
diff --git a/core/src/fxcrt/xml_int.h b/core/src/fxcrt/xml_int.h
index 39c288afa8..b11a64b505 100644
--- a/core/src/fxcrt/xml_int.h
+++ b/core/src/fxcrt/xml_int.h
@@ -48,7 +48,7 @@ class CXML_DataStmAcc : public IFX_BufferRead {
  public:
   CXML_DataStmAcc(IFX_FileRead* pFileRead)
       : m_pFileRead(pFileRead), m_pBuffer(NULL), m_nStart(0), m_dwSize(0) {
-    FXSYS_assert(m_pFileRead != NULL);
+    FXSYS_assert(m_pFileRead);
   }
   ~CXML_DataStmAcc() override { FX_Free(m_pBuffer); }
 
diff --git a/core/src/fxge/dib/fx_dib_main.cpp b/core/src/fxge/dib/fx_dib_main.cpp
index 6d37db9680..44d6c5022c 100644
--- a/core/src/fxge/dib/fx_dib_main.cpp
+++ b/core/src/fxge/dib/fx_dib_main.cpp
@@ -844,7 +844,6 @@ FX_BOOL CFX_DIBitmap::MultiplyAlpha(const CFX_DIBSource* pSrcBitmap) {
   if (pSrcBitmap->GetWidth() != m_Width ||
       pSrcBitmap->GetHeight() != m_Height) {
     pSrcClone = pSrcBitmap->StretchTo(m_Width, m_Height);
-    ASSERT(pSrcClone != NULL);
     if (pSrcClone == NULL) {
       return FALSE;
     }
@@ -1340,7 +1339,7 @@ FX_BOOL CFX_DIBitmap::DitherFS(const FX_DWORD* pPalette,
   if (m_pBuffer == NULL) {
     return FALSE;
   }
-  if (m_bpp != 8 && m_pPalette != NULL && m_AlphaFlag != 0) {
+  if (m_bpp != 8 && m_pPalette && m_AlphaFlag != 0) {
     return FALSE;
   }
   if (m_Width < 4 && m_Height < 4) {
diff --git a/core/src/fxge/ge/fx_ge_device.cpp b/core/src/fxge/ge/fx_ge_device.cpp
index 94efd864c0..37204268f2 100644
--- a/core/src/fxge/ge/fx_ge_device.cpp
+++ b/core/src/fxge/ge/fx_ge_device.cpp
@@ -19,7 +19,6 @@ void CFX_RenderDevice::SetDeviceDriver(IFX_RenderDeviceDriver* pDriver) {
   InitDeviceInfo();
 }
 void CFX_RenderDevice::InitDeviceInfo() {
-  ASSERT(m_pDeviceDriver != NULL);
   m_Width = m_pDeviceDriver->GetDeviceCaps(FXDC_PIXEL_WIDTH);
   m_Height = m_pDeviceDriver->GetDeviceCaps(FXDC_PIXEL_HEIGHT);
   m_bpp = m_pDeviceDriver->GetDeviceCaps(FXDC_BITS_PIXEL);
diff --git a/core/src/fxge/ge/fx_ge_ps.cpp b/core/src/fxge/ge/fx_ge_ps.cpp
index 6ce8f4635b..ceb2acf2bc 100644
--- a/core/src/fxge/ge/fx_ge_ps.cpp
+++ b/core/src/fxge/ge/fx_ge_ps.cpp
@@ -417,7 +417,7 @@ FX_BOOL CFX_PSRenderer::DrawDIBits(const CFX_DIBSource* pSource,
           pConverted = pSource->CloneConvert(FXDIB_Rgb);
           break;
         case FXDIB_8bppRgb:
-          if (pSource->GetPalette() != NULL) {
+          if (pSource->GetPalette()) {
             pConverted = pSource->CloneConvert(FXDIB_Rgb);
           }
           break;
@@ -425,7 +425,7 @@ FX_BOOL CFX_PSRenderer::DrawDIBits(const CFX_DIBSource* pSource,
           pConverted = pSource->CloneConvert(FXDIB_Cmyk);
           break;
         case FXDIB_8bppCmyk:
-          if (pSource->GetPalette() != NULL) {
+          if (pSource->GetPalette()) {
             pConverted = pSource->CloneConvert(FXDIB_Cmyk);
           }
           break;
diff --git a/core/src/fxge/ge/fx_ge_text.cpp b/core/src/fxge/ge/fx_ge_text.cpp
index d330576433..cd6b690a12 100644
--- a/core/src/fxge/ge/fx_ge_text.cpp
+++ b/core/src/fxge/ge/fx_ge_text.cpp
@@ -229,7 +229,7 @@ FX_BOOL CFX_RenderDevice::DrawNormalText(int nChars,
   if (FXSYS_fabs(char2device.a) + FXSYS_fabs(char2device.b) > 50 * 1.0f ||
       ((m_DeviceClass == FXDC_PRINTER && !m_pDeviceDriver->IsPSPrintDriver()) &&
        !(text_flags & FXTEXT_PRINTIMAGETEXT))) {
-    if (pFont->GetFace() != NULL ||
+    if (pFont->GetFace() ||
         (pFont->GetSubstFont()->m_SubstFlags & FXFONT_SUBST_GLYPHPATH)) {
       int nPathFlags =
           (text_flags & FXTEXT_NOSMOOTH) == 0 ? 0 : FXFILL_NOPATHSMOOTH;
diff --git a/core/src/fxge/win32/fx_win32_device.cpp b/core/src/fxge/win32/fx_win32_device.cpp
index 4ca4316c2e..6d520468a3 100644
--- a/core/src/fxge/win32/fx_win32_device.cpp
+++ b/core/src/fxge/win32/fx_win32_device.cpp
@@ -1186,7 +1186,7 @@ FX_BOOL CGdiDisplayDriver::StretchDIBits(const CFX_DIBSource* pSource,
                                          int alpha_flag,
                                          void* pIccTransform,
                                          int blend_type) {
-  ASSERT(pSource != NULL && pClipRect != NULL);
+  ASSERT(pSource && pClipRect);
   if (flags || dest_width > 10000 || dest_width < -10000 ||
       dest_height > 10000 || dest_height < -10000) {
     return UseFoxitStretchEngine(pSource, color, dest_left, dest_top,
diff --git a/core/src/fxge/win32/fx_win32_dwrite.cpp b/core/src/fxge/win32/fx_win32_dwrite.cpp
index ab50f3cf38..83924f23e7 100644
--- a/core/src/fxge/win32/fx_win32_dwrite.cpp
+++ b/core/src/fxge/win32/fx_win32_dwrite.cpp
@@ -18,14 +18,14 @@ typedef HRESULT(__stdcall* FuncType_DWriteCreateFactory)(
     __out IUnknown**);
 template <typename InterfaceType>
 inline void SafeRelease(InterfaceType** currentObject) {
-  if (*currentObject != NULL) {
+  if (*currentObject) {
     (*currentObject)->Release();
     *currentObject = NULL;
   }
 }
 template <typename InterfaceType>
 inline InterfaceType* SafeAcquire(InterfaceType* newObject) {
-  if (newObject != NULL) {
+  if (newObject) {
     newObject->AddRef();
   }
   return newObject;
diff --git a/core/src/fxge/win32/fx_win32_gdipext.cpp b/core/src/fxge/win32/fx_win32_gdipext.cpp
index 2886ee81d0..e79a88cb81 100644
--- a/core/src/fxge/win32/fx_win32_gdipext.cpp
+++ b/core/src/fxge/win32/fx_win32_gdipext.cpp
@@ -1295,7 +1295,7 @@ class GpStream final : public IStream {
                                          ULONG* pcbRead) {
     size_t bytes_left;
     size_t bytes_out;
-    if (pcbRead != NULL) {
+    if (pcbRead) {
       *pcbRead = 0;
     }
     if (m_ReadPos == m_InterStream.GetLength()) {
@@ -1305,7 +1305,7 @@ class GpStream final : public IStream {
     bytes_out = FX_MIN(cb, bytes_left);
     FXSYS_memcpy(Output, m_InterStream.GetBuffer() + m_ReadPos, bytes_out);
     m_ReadPos += (int32_t)bytes_out;
-    if (pcbRead != NULL) {
+    if (pcbRead) {
       *pcbRead = (ULONG)bytes_out;
     }
     return S_OK;
@@ -1314,13 +1314,13 @@ class GpStream final : public IStream {
                                           ULONG cb,
                                           ULONG* pcbWritten) {
     if (cb <= 0) {
-      if (pcbWritten != NULL) {
+      if (pcbWritten) {
         *pcbWritten = 0;
       }
       return S_OK;
     }
     m_InterStream.InsertBlock(m_InterStream.GetLength(), Input, cb);
-    if (pcbWritten != NULL) {
+    if (pcbWritten) {
       *pcbWritten = cb;
     }
     return S_OK;
@@ -1374,7 +1374,7 @@ class GpStream final : public IStream {
       return STG_E_SEEKERROR;
     }
     m_ReadPos = new_read_position;
-    if (lpNewFilePointer != NULL) {
+    if (lpNewFilePointer) {
       lpNewFilePointer->QuadPart = m_ReadPos;
     }
     return S_OK;
diff --git a/core/src/fxge/win32/fx_win32_print.cpp b/core/src/fxge/win32/fx_win32_print.cpp
index c829a438b9..39828b14d8 100644
--- a/core/src/fxge/win32/fx_win32_print.cpp
+++ b/core/src/fxge/win32/fx_win32_print.cpp
@@ -49,7 +49,7 @@ FX_BOOL CGdiPrinterDriver::SetDIBits(const CFX_DIBSource* pSource,
                          pSource->GetHeight(), &clip_rect, 0, alpha_flag,
                          pIccTransform, FXDIB_BLEND_NORMAL);
   }
-  ASSERT(pSource != NULL && !pSource->IsAlphaMask() && pSrcRect != NULL);
+  ASSERT(pSource && !pSource->IsAlphaMask() && pSrcRect);
   ASSERT(blend_type == FXDIB_BLEND_NORMAL);
   if (pSource->HasAlpha()) {
     return FALSE;