Make down-conversion explicit from CFX_ByteString to CFX_ByteStringC.

Having this happen implicitly can be dangerous because the lifetime
has to be considered; we should have caught the "red bots" in
https://codereview.chromium.org/1847333004/#ps60001 at compile time.

Review URL: https://codereview.chromium.org/1853233002

64 files changed, 550 insertions, 419 deletions

diff --git a/core/fpdfapi/fpdf_edit/cpdf_pagecontentgenerator.cpp b/core/fpdfapi/fpdf_edit/cpdf_pagecontentgenerator.cpp
index 6c5339128b..af79fd31c1 100644
--- a/core/fpdfapi/fpdf_edit/cpdf_pagecontentgenerator.cpp
+++ b/core/fpdfapi/fpdf_edit/cpdf_pagecontentgenerator.cpp
@@ -74,12 +74,13 @@ CFX_ByteString CPDF_PageContentGenerator::RealizeResource(
   int idnum = 1;
   while (1) {
     name.Format("FX%c%d", szType[0], idnum);
-    if (!pResList->KeyExist(name)) {
+    if (!pResList->KeyExist(name.AsByteStringC())) {
       break;
     }
     idnum++;
   }
-  pResList->AddReference(name, m_pDocument, pResourceObj->GetObjNum());
+  pResList->AddReference(name.AsByteStringC(), m_pDocument,
+                         pResourceObj->GetObjNum());
   return name;
 }
 void CPDF_PageContentGenerator::ProcessImage(CFX_ByteTextBuf& buf,
diff --git a/core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp b/core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
index 21934d35c4..323602b0e1 100644
--- a/core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
+++ b/core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
@@ -54,7 +54,7 @@ int32_t PDF_CreatorAppendObject(const CPDF_Object* pObj,
       if (pFile->AppendString(" ") < 0) {
         return -1;
       }
-      if ((len = pFile->AppendString(pObj->GetString())) < 0) {
+      if ((len = pFile->AppendString(pObj->GetString().AsByteStringC())) < 0) {
         return -1;
       }
       offset += len + 1;
@@ -62,7 +62,8 @@ int32_t PDF_CreatorAppendObject(const CPDF_Object* pObj,
     case CPDF_Object::STRING: {
       CFX_ByteString str = pObj->GetString();
       FX_BOOL bHex = pObj->AsString()->IsHex();
-      if ((len = pFile->AppendString(PDF_EncodeString(str, bHex))) < 0) {
+      if ((len = pFile->AppendString(
+               PDF_EncodeString(str, bHex).AsByteStringC())) < 0) {
         return -1;
       }
       offset += len;
@@ -73,7 +74,8 @@ int32_t PDF_CreatorAppendObject(const CPDF_Object* pObj,
         return -1;
       }
       CFX_ByteString str = pObj->GetString();
-      if ((len = pFile->AppendString(PDF_NameEncode(str))) < 0) {
+      if ((len = pFile->AppendString(PDF_NameEncode(str).AsByteStringC())) <
+          0) {
         return -1;
       }
       offset += len + 1;
@@ -132,7 +134,8 @@ int32_t PDF_CreatorAppendObject(const CPDF_Object* pObj,
         if (pFile->AppendString("/") < 0) {
           return -1;
         }
-        if ((len = pFile->AppendString(PDF_NameEncode(key))) < 0) {
+        if ((len = pFile->AppendString(PDF_NameEncode(key).AsByteStringC())) <
+            0) {
           return -1;
         }
         offset += len + 1;
@@ -211,7 +214,8 @@ int32_t PDF_CreatorWriteTrailer(CPDF_Document* pDocument,
       if (pFile->AppendString(("/")) < 0) {
         return -1;
       }
-      if ((len = pFile->AppendString(PDF_NameEncode(key))) < 0) {
+      if ((len = pFile->AppendString(PDF_NameEncode(key).AsByteStringC())) <
+          0) {
         return -1;
       }
       offset += len + 1;
@@ -1114,7 +1118,7 @@ int32_t CPDF_Creator::WriteDirectObj(uint32_t objnum,
       if (m_File.AppendString(" ") < 0) {
         return -1;
       }
-      if ((len = m_File.AppendString(pObj->GetString())) < 0) {
+      if ((len = m_File.AppendString(pObj->GetString().AsByteStringC())) < 0) {
         return -1;
       }
       m_Offset += len + 1;
@@ -1124,7 +1128,7 @@ int32_t CPDF_Creator::WriteDirectObj(uint32_t objnum,
       FX_BOOL bHex = pObj->AsString()->IsHex();
       if (!m_pCryptoHandler || !bEncrypt) {
         CFX_ByteString content = PDF_EncodeString(str, bHex);
-        if ((len = m_File.AppendString(content)) < 0) {
+        if ((len = m_File.AppendString(content.AsByteStringC())) < 0) {
           return -1;
         }
         m_Offset += len;
@@ -1136,7 +1140,7 @@ int32_t CPDF_Creator::WriteDirectObj(uint32_t objnum,
       CFX_ByteString content = PDF_EncodeString(
           CFX_ByteString((const FX_CHAR*)encryptor.m_pData, encryptor.m_dwSize),
           bHex);
-      if ((len = m_File.AppendString(content)) < 0) {
+      if ((len = m_File.AppendString(content.AsByteStringC())) < 0) {
         return -1;
       }
       m_Offset += len;
@@ -1176,7 +1180,8 @@ int32_t CPDF_Creator::WriteDirectObj(uint32_t objnum,
         return -1;
       }
       CFX_ByteString str = pObj->GetString();
-      if ((len = m_File.AppendString(PDF_NameEncode(str))) < 0) {
+      if ((len = m_File.AppendString(PDF_NameEncode(str).AsByteStringC())) <
+          0) {
         return -1;
       }
       m_Offset += len + 1;
@@ -1240,7 +1245,8 @@ int32_t CPDF_Creator::WriteDirectObj(uint32_t objnum,
         if (m_File.AppendString("/") < 0) {
           return -1;
         }
-        if ((len = m_File.AppendString(PDF_NameEncode(key))) < 0) {
+        if ((len = m_File.AppendString(PDF_NameEncode(key).AsByteStringC())) <
+            0) {
           return -1;
         }
         m_Offset += len + 1;
@@ -1642,7 +1648,7 @@ int32_t CPDF_Creator::WriteDoc_Stage3(IFX_Pause* pPause) {
         str = m_ObjectOffset.GetPtrAt(1)
                   ? "xref\r\n"
                   : "xref\r\n0 1\r\n0000000000 65535 f\r\n";
-        if (m_File.AppendString(str) < 0) {
+        if (m_File.AppendString(str.AsByteStringC()) < 0) {
           return -1;
         }
         m_Pos = (void*)(uintptr_t)1;
@@ -1771,7 +1777,7 @@ int32_t CPDF_Creator::WriteDoc_Stage4(IFX_Pause* pPause) {
         if (m_File.AppendString(("/")) < 0) {
           return -1;
         }
-        if (m_File.AppendString(PDF_NameEncode(key)) < 0) {
+        if (m_File.AppendString(PDF_NameEncode(key).AsByteStringC()) < 0) {
           return -1;
         }
         if (pValue->GetObjNum()) {
diff --git a/core/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp b/core/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
index 0f75cb04a8..d70c04c690 100644
--- a/core/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
+++ b/core/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
@@ -1124,7 +1124,7 @@ CPDF_Font* CPDF_Document::AddStandardFont(const FX_CHAR* font,
   CFX_ByteString name(font);
   if (PDF_GetStandardFontName(&name) < 0)
     return nullptr;
-  return GetPageData()->GetStandardFont(name, pEncoding);
+  return GetPageData()->GetStandardFont(name.AsByteStringC(), pEncoding);
 }
 
 void CPDF_Document::DeletePage(int iPage) {
diff --git a/core/fpdfapi/fpdf_font/fpdf_font.cpp b/core/fpdfapi/fpdf_font/fpdf_font.cpp
index ce2390ec08..aff2b72960 100644
--- a/core/fpdfapi/fpdf_font/fpdf_font.cpp
+++ b/core/fpdfapi/fpdf_font/fpdf_font.cpp
@@ -233,9 +233,9 @@ void CPDF_ToUnicodeMap::Load(CPDF_Stream* pStream) {
           break;
         }
         high = parser.GetWord();
-        uint32_t lowcode = StringToCode(low);
-        uint32_t highcode =
-            (lowcode & 0xffffff00) | (StringToCode(high) & 0xff);
+        uint32_t lowcode = StringToCode(low.AsByteStringC());
+        uint32_t highcode = (lowcode & 0xffffff00) |
+                            (StringToCode(high.AsByteStringC()) & 0xff);
         if (highcode == (uint32_t)-1) {
           break;
         }
@@ -243,7 +243,7 @@ void CPDF_ToUnicodeMap::Load(CPDF_Stream* pStream) {
         if (start == "[") {
           for (uint32_t code = lowcode; code <= highcode; code++) {
             CFX_ByteString dest = parser.GetWord();
-            CFX_WideString destcode = StringToWideString(dest);
+            CFX_WideString destcode = StringToWideString(dest.AsByteStringC());
             int len = destcode.GetLength();
             if (len == 0) {
               continue;
@@ -258,11 +258,11 @@ void CPDF_ToUnicodeMap::Load(CPDF_Stream* pStream) {
           }
           parser.GetWord();
         } else {
-          CFX_WideString destcode = StringToWideString(start);
+          CFX_WideString destcode = StringToWideString(start.AsByteStringC());
           int len = destcode.GetLength();
           uint32_t value = 0;
           if (len == 1) {
-            value = StringToCode(start);
+            value = StringToCode(start.AsByteStringC());
             for (uint32_t code = lowcode; code <= highcode; code++) {
               m_Map[code] = value++;
             }
diff --git a/core/fpdfapi/fpdf_font/fpdf_font_cid.cpp b/core/fpdfapi/fpdf_font/fpdf_font_cid.cpp
index 2552a3c0a6..fb3707f498 100644
--- a/core/fpdfapi/fpdf_font/fpdf_font_cid.cpp
+++ b/core/fpdfapi/fpdf_font/fpdf_font_cid.cpp
@@ -440,7 +440,7 @@ void CPDF_CMapParser::ParseWord(const CFX_ByteStringC& word) {
       }
       if (m_CodeSeq % 2) {
         CMap_CodeRange range;
-        if (CMap_GetCodeRange(range, m_LastWord, word)) {
+        if (CMap_GetCodeRange(range, m_LastWord.AsByteStringC(), word)) {
           m_CodeRanges.Add(range);
         }
       }
diff --git a/core/fpdfapi/fpdf_page/cpdf_allstates.cpp b/core/fpdfapi/fpdf_page/cpdf_allstates.cpp
index 159de584ee..d81a488d20 100644
--- a/core/fpdfapi/fpdf_page/cpdf_allstates.cpp
+++ b/core/fpdfapi/fpdf_page/cpdf_allstates.cpp
@@ -115,7 +115,7 @@ void CPDF_AllStates::ProcessExtGS(CPDF_Dictionary* pGS,
         CFX_ByteString mode =
             pArray ? pArray->GetStringAt(0) : pObject->GetString();
 
-        pGeneralState->SetBlendMode(mode);
+        pGeneralState->SetBlendMode(mode.AsByteStringC());
         if (pGeneralState->m_BlendType > FXDIB_BLEND_MULTIPLY) {
           pParser->GetPageObjectHolder()->SetBackgroundAlphaNeeded(TRUE);
         }
diff --git a/core/fpdfapi/fpdf_page/fpdf_page_doc.cpp b/core/fpdfapi/fpdf_page/fpdf_page_doc.cpp
index 9f4ad5a7d5..758ce940d2 100644
--- a/core/fpdfapi/fpdf_page/fpdf_page_doc.cpp
+++ b/core/fpdfapi/fpdf_page/fpdf_page_doc.cpp
@@ -331,7 +331,7 @@ CPDF_ColorSpace* CPDF_DocPageData::GetColorSpace(
     if (!pCS && pResources) {
       CPDF_Dictionary* pList = pResources->GetDictBy("ColorSpace");
       if (pList) {
-        pCSObj = pList->GetDirectObjectBy(name);
+        pCSObj = pList->GetDirectObjectBy(name.AsByteStringC());
         return GetColorSpace(pCSObj, nullptr);
       }
     }
diff --git a/core/fpdfapi/fpdf_page/fpdf_page_parser.cpp b/core/fpdfapi/fpdf_page/fpdf_page_parser.cpp
index daddb9f05b..4f304a3b3b 100644
--- a/core/fpdfapi/fpdf_page/fpdf_page_parser.cpp
+++ b/core/fpdfapi/fpdf_page/fpdf_page_parser.cpp
@@ -566,9 +566,9 @@ void CPDF_StreamContentParser::Handle_BeginImage() {
     if (!key.IsEmpty()) {
       uint32_t dwObjNum = pObj ? pObj->GetObjNum() : 0;
       if (dwObjNum)
-        pDict->SetAtReference(key, m_pDocument, dwObjNum);
+        pDict->SetAtReference(key.AsByteStringC(), m_pDocument, dwObjNum);
       else
-        pDict->SetAt(key, pObj.release());
+        pDict->SetAt(key.AsByteStringC(), pObj.release());
     }
   }
   PDF_ReplaceAbbr(pDict);
@@ -721,7 +721,8 @@ void CPDF_StreamContentParser::Handle_ExecuteXObject() {
       pList = m_pPageResources->GetDictBy("XObject");
     if (!pList)
       return;
-    CPDF_Reference* pRes = ToReference(pList->GetObjectBy(name));
+    CPDF_Reference* pRes =
+        ToReference(pList->GetObjectBy(name.AsByteStringC()));
     if (!pRes)
       return;
 
@@ -1257,7 +1258,7 @@ CPDF_Object* CPDF_StreamContentParser::FindResourceObj(
     if (!pList) {
       return NULL;
     }
-    CPDF_Object* pRes = pList->GetDirectObjectBy(name);
+    CPDF_Object* pRes = pList->GetDirectObjectBy(name.AsByteStringC());
     return pRes;
   }
   CPDF_Dictionary* pList = m_pResources->GetDictBy(type);
@@ -1269,10 +1270,10 @@ CPDF_Object* CPDF_StreamContentParser::FindResourceObj(
     if (!pList) {
       return NULL;
     }
-    CPDF_Object* pRes = pList->GetDirectObjectBy(name);
+    CPDF_Object* pRes = pList->GetDirectObjectBy(name.AsByteStringC());
     return pRes;
   }
-  CPDF_Object* pRes = pList->GetDirectObjectBy(name);
+  CPDF_Object* pRes = pList->GetDirectObjectBy(name.AsByteStringC());
   return pRes;
 }
 
@@ -1763,8 +1764,9 @@ void PDF_ReplaceAbbr(CPDF_Object* pObj) {
       for (const auto& it : *pDict) {
         CFX_ByteString key = it.first;
         CPDF_Object* value = it.second;
-        CFX_ByteStringC fullname = PDF_FindFullName(
-            PDF_InlineKeyAbbr, FX_ArraySize(PDF_InlineKeyAbbr), key);
+        CFX_ByteStringC fullname =
+            PDF_FindFullName(PDF_InlineKeyAbbr, FX_ArraySize(PDF_InlineKeyAbbr),
+                             key.AsByteStringC());
         if (!fullname.IsEmpty()) {
           AbbrReplacementOp op;
           op.is_replace_key = true;
@@ -1777,7 +1779,8 @@ void PDF_ReplaceAbbr(CPDF_Object* pObj) {
         if (value->IsName()) {
           CFX_ByteString name = value->GetString();
           fullname = PDF_FindFullName(PDF_InlineValueAbbr,
-                                      FX_ArraySize(PDF_InlineValueAbbr), name);
+                                      FX_ArraySize(PDF_InlineValueAbbr),
+                                      name.AsByteStringC());
           if (!fullname.IsEmpty()) {
             AbbrReplacementOp op;
             op.is_replace_key = false;
@@ -1791,9 +1794,9 @@ void PDF_ReplaceAbbr(CPDF_Object* pObj) {
       }
       for (const auto& op : replacements) {
         if (op.is_replace_key)
-          pDict->ReplaceKey(op.key, op.replacement);
+          pDict->ReplaceKey(op.key.AsByteStringC(), op.replacement);
         else
-          pDict->SetAtName(op.key, op.replacement);
+          pDict->SetAtName(op.key.AsByteStringC(), op.replacement);
       }
       break;
     }
@@ -1804,7 +1807,8 @@ void PDF_ReplaceAbbr(CPDF_Object* pObj) {
         if (pElement->IsName()) {
           CFX_ByteString name = pElement->GetString();
           CFX_ByteStringC fullname = PDF_FindFullName(
-              PDF_InlineValueAbbr, FX_ArraySize(PDF_InlineValueAbbr), name);
+              PDF_InlineValueAbbr, FX_ArraySize(PDF_InlineValueAbbr),
+              name.AsByteStringC());
           if (!fullname.IsEmpty()) {
             pArray->SetAt(i, new CPDF_Name(fullname));
           }
diff --git a/core/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp b/core/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp
index a5db2d6d20..a3c88c00df 100644
--- a/core/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp
+++ b/core/fpdfapi/fpdf_page/fpdf_page_parser_old.cpp
@@ -427,7 +427,7 @@ CPDF_Object* CPDF_StreamParser::ReadNextObject(FX_BOOL bAllowNestedArray,
         return nullptr;
       }
       if (!key.IsEmpty()) {
-        pDict->SetAt(key, pObj);
+        pDict->SetAt(key.AsByteStringC(), pObj);
       } else {
         pObj->Release();
       }
diff --git a/core/fpdfapi/fpdf_parser/cpdf_name.cpp b/core/fpdfapi/fpdf_parser/cpdf_name.cpp
index db37754b66..a7adf1b3d6 100644
--- a/core/fpdfapi/fpdf_parser/cpdf_name.cpp
+++ b/core/fpdfapi/fpdf_parser/cpdf_name.cpp
@@ -29,7 +29,7 @@ CFX_ByteString CPDF_Name::GetString() const {
 }
 
 CFX_ByteStringC CPDF_Name::GetConstString() const {
-  return CFX_ByteStringC(m_Name);
+  return m_Name.AsByteStringC();
 }
 
 void CPDF_Name::SetString(const CFX_ByteString& str) {
diff --git a/core/fpdfapi/fpdf_parser/cpdf_number.cpp b/core/fpdfapi/fpdf_parser/cpdf_number.cpp
index d2f0503bc1..dbc17d5dd6 100644
--- a/core/fpdfapi/fpdf_parser/cpdf_number.cpp
+++ b/core/fpdfapi/fpdf_parser/cpdf_number.cpp
@@ -47,7 +47,7 @@ const CPDF_Number* CPDF_Number::AsNumber() const {
 }
 
 void CPDF_Number::SetString(const CFX_ByteString& str) {
-  FX_atonum(str, m_bInteger, &m_Integer);
+  FX_atonum(str.AsByteStringC(), m_bInteger, &m_Integer);
 }
 
 CFX_ByteString CPDF_Number::GetString() const {
diff --git a/core/fpdfapi/fpdf_parser/cpdf_object_unittest.cpp b/core/fpdfapi/fpdf_parser/cpdf_object_unittest.cpp
index 2069a161ea..6c1738d5a6 100644
--- a/core/fpdfapi/fpdf_parser/cpdf_object_unittest.cpp
+++ b/core/fpdfapi/fpdf_parser/cpdf_object_unittest.cpp
@@ -135,7 +135,7 @@ class PDFObjectsTest : public testing::Test {
           return false;
         for (CPDF_Dictionary::const_iterator it = dict1->begin();
              it != dict1->end(); ++it) {
-          if (!Equal(it->second, dict2->GetObjectBy(it->first)))
+          if (!Equal(it->second, dict2->GetObjectBy(it->first.AsByteStringC())))
             return false;
         }
         return true;
diff --git a/core/fpdfapi/fpdf_parser/cpdf_parser.cpp b/core/fpdfapi/fpdf_parser/cpdf_parser.cpp
index 305401525c..73ca71ef1a 100644
--- a/core/fpdfapi/fpdf_parser/cpdf_parser.cpp
+++ b/core/fpdfapi/fpdf_parser/cpdf_parser.cpp
@@ -822,10 +822,11 @@ FX_BOOL CPDF_Parser::RebuildCrossRef() {
                           uint32_t dwObjNum =
                               pElement ? pElement->GetObjNum() : 0;
                           if (dwObjNum) {
-                            m_pTrailer->SetAtReference(key, m_pDocument,
-                                                       dwObjNum);
+                            m_pTrailer->SetAtReference(key.AsByteStringC(),
+                                                       m_pDocument, dwObjNum);
                           } else {
-                            m_pTrailer->SetAt(key, pElement->Clone());
+                            m_pTrailer->SetAt(key.AsByteStringC(),
+                                              pElement->Clone());
                           }
                         }
                       }
diff --git a/core/fpdfapi/fpdf_parser/cpdf_standard_security_handler.cpp b/core/fpdfapi/fpdf_parser/cpdf_standard_security_handler.cpp
index ac7667c3ea..9846c40d8f 100644
--- a/core/fpdfapi/fpdf_parser/cpdf_standard_security_handler.cpp
+++ b/core/fpdfapi/fpdf_parser/cpdf_standard_security_handler.cpp
@@ -166,14 +166,15 @@ FX_BOOL CPDF_StandardSecurityHandler::LoadDict(CPDF_Dictionary* pEncryptDict) {
   m_Revision = pEncryptDict->GetIntegerBy("R");
   m_Permissions = pEncryptDict->GetIntegerBy("P", -1);
   if (m_Version < 4) {
-    return _LoadCryptInfo(pEncryptDict, CFX_ByteString(), m_Cipher, m_KeyLen);
+    return _LoadCryptInfo(pEncryptDict, CFX_ByteStringC(), m_Cipher, m_KeyLen);
   }
   CFX_ByteString stmf_name = pEncryptDict->GetStringBy("StmF");
   CFX_ByteString strf_name = pEncryptDict->GetStringBy("StrF");
   if (stmf_name != strf_name) {
     return FALSE;
   }
-  if (!_LoadCryptInfo(pEncryptDict, strf_name, m_Cipher, m_KeyLen)) {
+  if (!_LoadCryptInfo(pEncryptDict, strf_name.AsByteStringC(), m_Cipher,
+                      m_KeyLen)) {
     return FALSE;
   }
   return TRUE;
@@ -195,7 +196,8 @@ FX_BOOL CPDF_StandardSecurityHandler::LoadDict(CPDF_Dictionary* pEncryptDict,
       return FALSE;
     }
   }
-  if (!_LoadCryptInfo(pEncryptDict, strf_name, cipher, key_len)) {
+  if (!_LoadCryptInfo(pEncryptDict, strf_name.AsByteStringC(), cipher,
+                      key_len)) {
     return FALSE;
   }
   m_Cipher = cipher;
diff --git a/core/fpdfapi/fpdf_parser/cpdf_string.cpp b/core/fpdfapi/fpdf_parser/cpdf_string.cpp
index 9a88e937ab..3f04d125a2 100644
--- a/core/fpdfapi/fpdf_parser/cpdf_string.cpp
+++ b/core/fpdfapi/fpdf_parser/cpdf_string.cpp
@@ -32,7 +32,7 @@ CFX_ByteString CPDF_String::GetString() const {
 }
 
 CFX_ByteStringC CPDF_String::GetConstString() const {
-  return CFX_ByteStringC(m_String);
+  return m_String.AsByteStringC();
 }
 
 void CPDF_String::SetString(const CFX_ByteString& str) {
diff --git a/core/fpdfapi/fpdf_parser/cpdf_syntax_parser.cpp b/core/fpdfapi/fpdf_parser/cpdf_syntax_parser.cpp
index 5a3db292e0..d04a682b77 100644
--- a/core/fpdfapi/fpdf_parser/cpdf_syntax_parser.cpp
+++ b/core/fpdfapi/fpdf_parser/cpdf_syntax_parser.cpp
@@ -399,7 +399,7 @@ CPDF_Object* CPDF_SyntaxParser::GetObject(CPDF_IndirectObjectHolder* pObjList,
       }
     }
     m_Pos = SavedPos;
-    return new CPDF_Number(word);
+    return new CPDF_Number(word.AsByteStringC());
   }
 
   if (word == "true" || word == "false")
@@ -521,7 +521,7 @@ CPDF_Object* CPDF_SyntaxParser::GetObjectByStrict(
         return new CPDF_Reference(pObjList, FXSYS_atoui(word));
     }
     m_Pos = SavedPos;
-    return new CPDF_Number(word);
+    return new CPDF_Number(word.AsByteStringC());
   }
 
   if (word == "true" || word == "false")
diff --git a/core/fpdfapi/fpdf_parser/include/cpdf_object.h b/core/fpdfapi/fpdf_parser/include/cpdf_object.h
index 802cbbc638..6cdaaf58fd 100644
--- a/core/fpdfapi/fpdf_parser/include/cpdf_object.h
+++ b/core/fpdfapi/fpdf_parser/include/cpdf_object.h
@@ -46,6 +46,8 @@ class CPDF_Object {
   void Release();
 
   virtual CFX_ByteString GetString() const;
+
+  // Note: |this| must outlive the use of |GetConstString|'s result.
   virtual CFX_ByteStringC GetConstString() const;
   virtual CFX_WideString GetUnicodeText() const;
   virtual FX_FLOAT GetNumber() const;
diff --git a/core/fpdfdoc/cpvt_color.cpp b/core/fpdfdoc/cpvt_color.cpp
index afeff23e15..7ddb9df0d0 100644
--- a/core/fpdfdoc/cpvt_color.cpp
+++ b/core/fpdfdoc/cpvt_color.cpp
@@ -10,7 +10,7 @@
 
 // Static.
 CPVT_Color CPVT_Color::ParseColor(const CFX_ByteString& str) {
-  CPDF_SimpleParser syntax(str);
+  CPDF_SimpleParser syntax(str.AsByteStringC());
   if (syntax.FindTagParamFromStart("g", 1))
     return CPVT_Color(CPVT_Color::kGray, FX_atof(syntax.GetWord()));
 
diff --git a/core/fpdfdoc/cpvt_fontmap.cpp b/core/fpdfdoc/cpvt_fontmap.cpp
index 529f85169e..0aa7ac3486 100644
--- a/core/fpdfdoc/cpvt_fontmap.cpp
+++ b/core/fpdfdoc/cpvt_fontmap.cpp
@@ -38,8 +38,9 @@ void CPVT_FontMap::GetAnnotSysPDFFont(CPDF_Document* pDoc,
     return;
 
   if (CPDF_Dictionary* pFontList = pResDict->GetDictBy("Font")) {
-    if (!pFontList->KeyExist(sSysFontAlias))
-      pFontList->SetAtReference(sSysFontAlias, pDoc, pPDFFont->GetFontDict());
+    if (!pFontList->KeyExist(sSysFontAlias.AsByteStringC()))
+      pFontList->SetAtReference(sSysFontAlias.AsByteStringC(), pDoc,
+                                pPDFFont->GetFontDict());
   }
   pSysFont = pPDFFont;
 }
diff --git a/core/fpdfdoc/cpvt_generateap.cpp b/core/fpdfdoc/cpvt_generateap.cpp
index dd935de61e..c5e2cc7fab 100644
--- a/core/fpdfdoc/cpvt_generateap.cpp
+++ b/core/fpdfdoc/cpvt_generateap.cpp
@@ -36,7 +36,7 @@ FX_BOOL GenerateWidgetAP(CPDF_Document* pDoc,
   if (DA.IsEmpty())
     return FALSE;
 
-  CPDF_SimpleParser syntax(DA);
+  CPDF_SimpleParser syntax(DA.AsByteStringC());
   syntax.FindTagParamFromStart("Tf", 2);
   CFX_ByteString sFontName = syntax.GetWord();
   sFontName = PDF_NameDecode(sFontName);
@@ -54,12 +54,12 @@ FX_BOOL GenerateWidgetAP(CPDF_Document* pDoc,
   }
   CPDF_Dictionary* pDRFontDict = pDRDict ? pDRDict->GetDictBy("Font") : nullptr;
   if (pDRFontDict) {
-    pFontDict = pDRFontDict->GetDictBy(sFontName.Mid(1));
+    pFontDict = pDRFontDict->GetDictBy(sFontName.Mid(1).AsByteStringC());
     if (!pFontDict && !bUseFormRes) {
       pDRDict = pFormDict->GetDictBy("DR");
       pDRFontDict = pDRDict->GetDictBy("Font");
       if (pDRFontDict)
-        pFontDict = pDRFontDict->GetDictBy(sFontName.Mid(1));
+        pFontDict = pDRFontDict->GetDictBy(sFontName.Mid(1).AsByteStringC());
     }
   }
   if (!pDRFontDict)
@@ -72,7 +72,8 @@ FX_BOOL GenerateWidgetAP(CPDF_Document* pDoc,
     pFontDict->SetAtName("BaseFont", "Helvetica");
     pFontDict->SetAtName("Encoding", "WinAnsiEncoding");
     pDoc->AddIndirectObject(pFontDict);
-    pDRFontDict->SetAtReference(sFontName.Mid(1), pDoc, pFontDict);
+    pDRFontDict->SetAtReference(sFontName.Mid(1).AsByteStringC(), pDoc,
+                                pFontDict);
   }
   CPDF_Font* pDefFont = pDoc->LoadFont(pFontDict);
   if (!pDefFont)
@@ -189,8 +190,9 @@ FX_BOOL GenerateWidgetAP(CPDF_Document* pDoc,
         pStreamResFontList = new CPDF_Dictionary;
         pStreamResList->SetAt("Font", pStreamResFontList);
       }
-      if (!pStreamResFontList->KeyExist(sFontName))
-        pStreamResFontList->SetAtReference(sFontName, pDoc, pFontDict);
+      if (!pStreamResFontList->KeyExist(sFontName.AsByteStringC()))
+        pStreamResFontList->SetAtReference(sFontName.AsByteStringC(), pDoc,
+                                           pFontDict);
     } else {
       pStreamDict->SetAt("Resources", pFormDict->GetDictBy("DR")->Clone());
       pStreamResList = pStreamDict->GetDictBy("Resources");
@@ -435,8 +437,9 @@ FX_BOOL GenerateWidgetAP(CPDF_Document* pDoc,
           pStreamResFontList = new CPDF_Dictionary;
           pStreamResList->SetAt("Font", pStreamResFontList);
         }
-        if (!pStreamResFontList->KeyExist(sFontName))
-          pStreamResFontList->SetAtReference(sFontName, pDoc, pFontDict);
+        if (!pStreamResFontList->KeyExist(sFontName.AsByteStringC()))
+          pStreamResFontList->SetAtReference(sFontName.AsByteStringC(), pDoc,
+                                             pFontDict);
       } else {
         pStreamDict->SetAt("Resources", pFormDict->GetDictBy("DR")->Clone());
         pStreamResList = pStreamDict->GetDictBy("Resources");
diff --git a/core/fpdfdoc/doc_action.cpp b/core/fpdfdoc/doc_action.cpp
index 2f08bfa3af..9a43b58e98 100644
--- a/core/fpdfdoc/doc_action.cpp
+++ b/core/fpdfdoc/doc_action.cpp
@@ -38,8 +38,8 @@ CPDF_Dest CPDF_Action::GetDest(CPDF_Document* pDoc) const {
   }
   if (pDest->IsString() || pDest->IsName()) {
     CPDF_NameTree name_tree(pDoc, "Dests");
-    CFX_ByteStringC name = pDest->GetString();
-    return CPDF_Dest(name_tree.LookupNamedDest(pDoc, name));
+    return CPDF_Dest(
+        name_tree.LookupNamedDest(pDoc, pDest->GetString().AsByteStringC()));
   }
   if (CPDF_Array* pArray = pDest->AsArray())
     return CPDF_Dest(pArray);
diff --git a/core/fpdfdoc/doc_annot.cpp b/core/fpdfdoc/doc_annot.cpp
index 276516589a..ca900acb9a 100644
--- a/core/fpdfdoc/doc_annot.cpp
+++ b/core/fpdfdoc/doc_annot.cpp
@@ -181,12 +181,12 @@ CPDF_Stream* FPDFDOC_GetAnnotAP(CPDF_Dictionary* pAnnotDict,
         CPDF_Dictionary* pDict = pAnnotDict->GetDictBy("Parent");
         value = pDict ? pDict->GetStringBy("V") : CFX_ByteString();
       }
-      if (value.IsEmpty() || !pDict->KeyExist(value))
+      if (value.IsEmpty() || !pDict->KeyExist(value.AsByteStringC()))
         as = "Off";
       else
         as = value;
     }
-    return pDict->GetStreamBy(as);
+    return pDict->GetStreamBy(as.AsByteStringC());
   }
   return nullptr;
 }
diff --git a/core/fpdfdoc/doc_basic.cpp b/core/fpdfdoc/doc_basic.cpp
index c711709e73..0c7f895405 100644
--- a/core/fpdfdoc/doc_basic.cpp
+++ b/core/fpdfdoc/doc_basic.cpp
@@ -90,12 +90,13 @@ static CPDF_Object* SearchNameNode(CPDF_Dictionary* pNode,
   if (pLimits) {
     CFX_ByteString csLeft = pLimits->GetStringAt(0);
     CFX_ByteString csRight = pLimits->GetStringAt(1);
-    if (csLeft.Compare(csRight) > 0) {
+    if (csLeft.Compare(csRight.AsByteStringC()) > 0) {
       CFX_ByteString csTmp = csRight;
       csRight = csLeft;
       csLeft = csTmp;
     }
-    if (csName.Compare(csLeft) < 0 || csName.Compare(csRight) > 0) {
+    if (csName.Compare(csLeft.AsByteStringC()) < 0 ||
+        csName.Compare(csRight.AsByteStringC()) > 0) {
       return NULL;
     }
   }
@@ -104,7 +105,7 @@ static CPDF_Object* SearchNameNode(CPDF_Dictionary* pNode,
     uint32_t dwCount = pNames->GetCount() / 2;
     for (uint32_t i = 0; i < dwCount; i++) {
       CFX_ByteString csValue = pNames->GetStringAt(i * 2);
-      int32_t iCompare = csValue.Compare(csName);
+      int32_t iCompare = csValue.Compare(csName.AsByteStringC());
       if (iCompare <= 0) {
         if (ppFind) {
           *ppFind = pNames;
@@ -500,7 +501,7 @@ int32_t CPDF_PageLabel::GetPageByLabel(const CFX_ByteStringC& bsLabel) const {
   CFX_ByteString bsOrig = bsLabel;
   for (int i = 0; i < nPages; i++) {
     bsLbl = PDF_EncodeText(GetLabel(i));
-    if (!bsLbl.Compare(bsOrig)) {
+    if (!bsLbl.Compare(bsOrig.AsByteStringC())) {
       return i;
     }
   }
@@ -512,6 +513,5 @@ int32_t CPDF_PageLabel::GetPageByLabel(const CFX_ByteStringC& bsLabel) const {
   return -1;
 }
 int32_t CPDF_PageLabel::GetPageByLabel(const CFX_WideStringC& wsLabel) const {
-  CFX_ByteString bsLabel = PDF_EncodeText(wsLabel.GetPtr());
-  return GetPageByLabel(bsLabel);
+  return GetPageByLabel(PDF_EncodeText(wsLabel.GetPtr()).AsByteStringC());
 }
diff --git a/core/fpdfdoc/doc_bookmark.cpp b/core/fpdfdoc/doc_bookmark.cpp
index 22ff7921ef..35a04043fe 100644
--- a/core/fpdfdoc/doc_bookmark.cpp
+++ b/core/fpdfdoc/doc_bookmark.cpp
@@ -80,8 +80,8 @@ CPDF_Dest CPDF_Bookmark::GetDest(CPDF_Document* pDocument) const {
     return CPDF_Dest();
   if (pDest->IsString() || pDest->IsName()) {
     CPDF_NameTree name_tree(pDocument, "Dests");
-    CFX_ByteStringC name = pDest->GetString();
-    return CPDF_Dest(name_tree.LookupNamedDest(pDocument, name));
+    return CPDF_Dest(name_tree.LookupNamedDest(
+        pDocument, pDest->GetString().AsByteStringC()));
   }
   if (CPDF_Array* pArray = pDest->AsArray())
     return CPDF_Dest(pArray);
diff --git a/core/fpdfdoc/doc_form.cpp b/core/fpdfdoc/doc_form.cpp
index 2a6d739549..aa4b5c9f30 100644
--- a/core/fpdfdoc/doc_form.cpp
+++ b/core/fpdfdoc/doc_form.cpp
@@ -343,8 +343,9 @@ CFX_ByteString CPDF_InterForm::GenerateNewResourceName(
   int num = 0;
   CFX_ByteString bsNum;
   while (TRUE) {
-    if (!pDict->KeyExist(csTmp + bsNum)) {
-      return csTmp + bsNum;
+    CFX_ByteString csKey = csTmp + bsNum;
+    if (!pDict->KeyExist(csKey.AsByteStringC())) {
+      return csKey;
     }
     if (m < iCount) {
       csTmp += csStr[m++];
diff --git a/core/fpdfdoc/doc_formcontrol.cpp b/core/fpdfdoc/doc_formcontrol.cpp
index 1fcc4a386b..0a0a8c9a03 100644
--- a/core/fpdfdoc/doc_formcontrol.cpp
+++ b/core/fpdfdoc/doc_formcontrol.cpp
@@ -78,7 +78,7 @@ void CPDF_FormControl::SetOnStateName(const CFX_ByteString& csOn) {
         continue;
       }
       if (csKey2 != "Off") {
-        pSubDict->ReplaceKey(csKey2, csValue);
+        pSubDict->ReplaceKey(csKey2.AsByteStringC(), csValue.AsByteStringC());
         break;
       }
     }
@@ -202,7 +202,7 @@ CPDF_ApSettings CPDF_FormControl::GetMK() const {
 }
 
 bool CPDF_FormControl::HasMKEntry(CFX_ByteString csEntry) const {
-  return GetMK().HasMKEntry(csEntry);
+  return GetMK().HasMKEntry(csEntry.AsByteStringC());
 }
 
 int CPDF_FormControl::GetRotation() {
@@ -210,24 +210,24 @@ int CPDF_FormControl::GetRotation() {
 }
 
 FX_ARGB CPDF_FormControl::GetColor(int& iColorType, CFX_ByteString csEntry) {
-  return GetMK().GetColor(iColorType, csEntry);
+  return GetMK().GetColor(iColorType, csEntry.AsByteStringC());
 }
 
 FX_FLOAT CPDF_FormControl::GetOriginalColor(int index, CFX_ByteString csEntry) {
-  return GetMK().GetOriginalColor(index, csEntry);
+  return GetMK().GetOriginalColor(index, csEntry.AsByteStringC());
 }
 
 void CPDF_FormControl::GetOriginalColor(int& iColorType,
                                         FX_FLOAT fc[4],
                                         CFX_ByteString csEntry) {
-  GetMK().GetOriginalColor(iColorType, fc, csEntry);
+  GetMK().GetOriginalColor(iColorType, fc, csEntry.AsByteStringC());
 }
 CFX_WideString CPDF_FormControl::GetCaption(CFX_ByteString csEntry) {
-  return GetMK().GetCaption(csEntry);
+  return GetMK().GetCaption(csEntry.AsByteStringC());
 }
 
 CPDF_Stream* CPDF_FormControl::GetIcon(CFX_ByteString csEntry) {
-  return GetMK().GetIcon(csEntry);
+  return GetMK().GetIcon(csEntry.AsByteStringC());
 }
 
 CPDF_IconFit CPDF_FormControl::GetIconFit() {
@@ -286,7 +286,8 @@ CPDF_Font* CPDF_FormControl::GetDefaultControlFont() {
   if (CPDF_Dictionary* pDict = ToDictionary(pObj)) {
     CPDF_Dictionary* pFonts = pDict->GetDictBy("Font");
     if (pFonts) {
-      CPDF_Dictionary* pElement = pFonts->GetDictBy(csFontNameTag);
+      CPDF_Dictionary* pElement =
+          pFonts->GetDictBy(csFontNameTag.AsByteStringC());
       if (pElement) {
         CPDF_Font* pFont = m_pField->m_pForm->m_pDocument->LoadFont(pElement);
         if (pFont) {
@@ -303,7 +304,8 @@ CPDF_Font* CPDF_FormControl::GetDefaultControlFont() {
   if (CPDF_Dictionary* pDict = ToDictionary(pObj)) {
     CPDF_Dictionary* pFonts = pDict->GetDictBy("Font");
     if (pFonts) {
-      CPDF_Dictionary* pElement = pFonts->GetDictBy(csFontNameTag);
+      CPDF_Dictionary* pElement =
+          pFonts->GetDictBy(csFontNameTag.AsByteStringC());
       if (pElement) {
         CPDF_Font* pFont = m_pField->m_pForm->m_pDocument->LoadFont(pElement);
         if (pFont) {
diff --git a/core/fpdfdoc/doc_formfield.cpp b/core/fpdfdoc/doc_formfield.cpp
index 0f8b3dd5ea..931f9e18d9 100644
--- a/core/fpdfdoc/doc_formfield.cpp
+++ b/core/fpdfdoc/doc_formfield.cpp
@@ -1054,7 +1054,7 @@ void CPDF_FormField::LoadDA() {
   if (DA.IsEmpty()) {
     return;
   }
-  CPDF_SimpleParser syntax(DA);
+  CPDF_SimpleParser syntax(DA.AsByteStringC());
   syntax.FindTagParamFromStart("Tf", 2);
   CFX_ByteString font_name = syntax.GetWord();
   CPDF_Dictionary* pFontDict = NULL;
@@ -1062,7 +1062,7 @@ void CPDF_FormField::LoadDA() {
       m_pForm->m_pFormDict->GetDictBy("DR")->GetDictBy("Font"))
     pFontDict = m_pForm->m_pFormDict->GetDictBy("DR")
                     ->GetDictBy("Font")
-                    ->GetDictBy(font_name);
+                    ->GetDictBy(font_name.AsByteStringC());
 
   if (!pFontDict) {
     return;
diff --git a/core/fpdfdoc/doc_link.cpp b/core/fpdfdoc/doc_link.cpp
index 723955f9ea..d86bf203e4 100644
--- a/core/fpdfdoc/doc_link.cpp
+++ b/core/fpdfdoc/doc_link.cpp
@@ -81,8 +81,8 @@ CPDF_Dest CPDF_Link::GetDest(CPDF_Document* pDoc) {
 
   if (pDest->IsString() || pDest->IsName()) {
     CPDF_NameTree name_tree(pDoc, "Dests");
-    CFX_ByteStringC name = pDest->GetString();
-    return CPDF_Dest(name_tree.LookupNamedDest(pDoc, name));
+    return CPDF_Dest(
+        name_tree.LookupNamedDest(pDoc, pDest->GetString().AsByteStringC()));
   }
   if (CPDF_Array* pArray = pDest->AsArray())
     return CPDF_Dest(pArray);
diff --git a/core/fpdfdoc/doc_ocg.cpp b/core/fpdfdoc/doc_ocg.cpp
index a739c1675c..7464936b62 100644
--- a/core/fpdfdoc/doc_ocg.cpp
+++ b/core/fpdfdoc/doc_ocg.cpp
@@ -142,7 +142,7 @@ FX_BOOL CPDF_OCContext::LoadOCGStateFromConfig(const CFX_ByteStringC& csConfig,
       if (!pState) {
         continue;
       }
-      bState = pState->GetStringBy(csFind) != "OFF";
+      bState = pState->GetStringBy(csFind.AsByteStringC()) != "OFF";
     }
   }
   return bState;
@@ -154,11 +154,11 @@ FX_BOOL CPDF_OCContext::LoadOCGState(const CPDF_Dictionary* pOCGDict) const {
   CFX_ByteString csState = FPDFDOC_OCG_GetUsageTypeString(m_eUsageType);
   CPDF_Dictionary* pUsage = pOCGDict->GetDictBy("Usage");
   if (pUsage) {
-    CPDF_Dictionary* pState = pUsage->GetDictBy(csState);
+    CPDF_Dictionary* pState = pUsage->GetDictBy(csState.AsByteStringC());
     if (pState) {
       CFX_ByteString csFind = csState + "State";
-      if (pState->KeyExist(csFind)) {
-        return pState->GetStringBy(csFind) != "OFF";
+      if (pState->KeyExist(csFind.AsByteStringC())) {
+        return pState->GetStringBy(csFind.AsByteStringC()) != "OFF";
       }
     }
     if (csState != "View") {
@@ -169,7 +169,7 @@ FX_BOOL CPDF_OCContext::LoadOCGState(const CPDF_Dictionary* pOCGDict) const {
     }
   }
   FX_BOOL bDefValid = FALSE;
-  return LoadOCGStateFromConfig(csState, pOCGDict, bDefValid);
+  return LoadOCGStateFromConfig(csState.AsByteStringC(), pOCGDict, bDefValid);
 }
 
 FX_BOOL CPDF_OCContext::GetOCGVisible(const CPDF_Dictionary* pOCGDict) {
diff --git a/core/fpdfdoc/doc_tagged.cpp b/core/fpdfdoc/doc_tagged.cpp
index 684789acc2..2a3554c499 100644
--- a/core/fpdfdoc/doc_tagged.cpp
+++ b/core/fpdfdoc/doc_tagged.cpp
@@ -205,7 +205,8 @@ CPDF_StructElementImpl::CPDF_StructElementImpl(CPDF_StructTreeImpl* pTree,
   m_pDict = pDict;
   m_Type = pDict->GetStringBy("S");
   if (pTree->m_pRoleMap) {
-    CFX_ByteString mapped = pTree->m_pRoleMap->GetStringBy(m_Type);
+    CFX_ByteString mapped =
+        pTree->m_pRoleMap->GetStringBy(m_Type.AsByteStringC());
     if (!mapped.IsEmpty()) {
       m_Type = mapped;
     }
@@ -373,14 +374,16 @@ CPDF_Object* CPDF_StructElementImpl::GetAttr(const CFX_ByteStringC& owner,
   if (CPDF_Array* pArray = pC->AsArray()) {
     for (uint32_t i = 0; i < pArray->GetCount(); i++) {
       CFX_ByteString class_name = pArray->GetStringAt(i);
-      CPDF_Dictionary* pClassDict = pClassMap->GetDictBy(class_name);
+      CPDF_Dictionary* pClassDict =
+          pClassMap->GetDictBy(class_name.AsByteStringC());
       if (pClassDict && pClassDict->GetStringBy("O") == owner)
         return pClassDict->GetDirectObjectBy(name);
     }
     return nullptr;
   }
   CFX_ByteString class_name = pC->GetString();
-  CPDF_Dictionary* pClassDict = pClassMap->GetDictBy(class_name);
+  CPDF_Dictionary* pClassDict =
+      pClassMap->GetDictBy(class_name.AsByteStringC());
   if (pClassDict && pClassDict->GetStringBy("O") == owner)
     return pClassDict->GetDirectObjectBy(name);
   return nullptr;
diff --git a/core/fpdfdoc/doc_utils.cpp b/core/fpdfdoc/doc_utils.cpp
index f83d001af5..d3b3cac627 100644
--- a/core/fpdfdoc/doc_utils.cpp
+++ b/core/fpdfdoc/doc_utils.cpp
@@ -82,7 +82,7 @@ FX_BOOL CPDF_DefaultAppearance::HasFont() {
   if (m_csDA.IsEmpty()) {
     return FALSE;
   }
-  CPDF_SimpleParser syntax(m_csDA);
+  CPDF_SimpleParser syntax(m_csDA.AsByteStringC());
   return syntax.FindTagParamFromStart("Tf", 2);
 }
 CFX_ByteString CPDF_DefaultAppearance::GetFontString() {
@@ -90,7 +90,7 @@ CFX_ByteString CPDF_DefaultAppearance::GetFontString() {
   if (m_csDA.IsEmpty()) {
     return csFont;
   }
-  CPDF_SimpleParser syntax(m_csDA);
+  CPDF_SimpleParser syntax(m_csDA.AsByteStringC());
   if (syntax.FindTagParamFromStart("Tf", 2)) {
     csFont += (CFX_ByteString)syntax.GetWord();
     csFont += " ";
@@ -107,11 +107,11 @@ void CPDF_DefaultAppearance::GetFont(CFX_ByteString& csFontNameTag,
   if (m_csDA.IsEmpty()) {
     return;
   }
-  CPDF_SimpleParser syntax(m_csDA);
+  CPDF_SimpleParser syntax(m_csDA.AsByteStringC());
   if (syntax.FindTagParamFromStart("Tf", 2)) {
-    csFontNameTag = (CFX_ByteString)syntax.GetWord();
+    csFontNameTag = CFX_ByteString(syntax.GetWord());
     csFontNameTag.Delete(0, 1);
-    fFontSize = FX_atof((CFX_ByteString)syntax.GetWord());
+    fFontSize = FX_atof(syntax.GetWord());
   }
   csFontNameTag = PDF_NameDecode(csFontNameTag);
 }
@@ -119,7 +119,7 @@ FX_BOOL CPDF_DefaultAppearance::HasColor(FX_BOOL bStrokingOperation) {
   if (m_csDA.IsEmpty()) {
     return FALSE;
   }
-  CPDF_SimpleParser syntax(m_csDA);
+  CPDF_SimpleParser syntax(m_csDA.AsByteStringC());
   if (syntax.FindTagParamFromStart(bStrokingOperation ? "G" : "g", 1)) {
     return TRUE;
   }
@@ -134,7 +134,7 @@ CFX_ByteString CPDF_DefaultAppearance::GetColorString(
   if (m_csDA.IsEmpty()) {
     return csColor;
   }
-  CPDF_SimpleParser syntax(m_csDA);
+  CPDF_SimpleParser syntax(m_csDA.AsByteStringC());
   if (syntax.FindTagParamFromStart(bStrokingOperation ? "G" : "g", 1)) {
     csColor += (CFX_ByteString)syntax.GetWord();
     csColor += " ";
@@ -174,25 +174,25 @@ void CPDF_DefaultAppearance::GetColor(int& iColorType,
   if (m_csDA.IsEmpty()) {
     return;
   }
-  CPDF_SimpleParser syntax(m_csDA);
+  CPDF_SimpleParser syntax(m_csDA.AsByteStringC());
   if (syntax.FindTagParamFromStart(bStrokingOperation ? "G" : "g", 1)) {
     iColorType = COLORTYPE_GRAY;
-    fc[0] = FX_atof((CFX_ByteString)syntax.GetWord());
+    fc[0] = FX_atof(syntax.GetWord());
     return;
   }
   if (syntax.FindTagParamFromStart(bStrokingOperation ? "RG" : "rg", 3)) {
     iColorType = COLORTYPE_RGB;
-    fc[0] = FX_atof((CFX_ByteString)syntax.GetWord());
-    fc[1] = FX_atof((CFX_ByteString)syntax.GetWord());
-    fc[2] = FX_atof((CFX_ByteString)syntax.GetWord());
+    fc[0] = FX_atof(syntax.GetWord());
+    fc[1] = FX_atof(syntax.GetWord());
+    fc[2] = FX_atof(syntax.GetWord());
     return;
   }
   if (syntax.FindTagParamFromStart(bStrokingOperation ? "K" : "k", 4)) {
     iColorType = COLORTYPE_CMYK;
-    fc[0] = FX_atof((CFX_ByteString)syntax.GetWord());
-    fc[1] = FX_atof((CFX_ByteString)syntax.GetWord());
-    fc[2] = FX_atof((CFX_ByteString)syntax.GetWord());
-    fc[3] = FX_atof((CFX_ByteString)syntax.GetWord());
+    fc[0] = FX_atof(syntax.GetWord());
+    fc[1] = FX_atof(syntax.GetWord());
+    fc[2] = FX_atof(syntax.GetWord());
+    fc[3] = FX_atof(syntax.GetWord());
   }
 }
 void CPDF_DefaultAppearance::GetColor(FX_ARGB& color,
@@ -203,27 +203,27 @@ void CPDF_DefaultAppearance::GetColor(FX_ARGB& color,
   if (m_csDA.IsEmpty()) {
     return;
   }
-  CPDF_SimpleParser syntax(m_csDA);
+  CPDF_SimpleParser syntax(m_csDA.AsByteStringC());
   if (syntax.FindTagParamFromStart(bStrokingOperation ? "G" : "g", 1)) {
     iColorType = COLORTYPE_GRAY;
-    FX_FLOAT g = FX_atof((CFX_ByteString)syntax.GetWord()) * 255 + 0.5f;
+    FX_FLOAT g = FX_atof(syntax.GetWord()) * 255 + 0.5f;
     color = ArgbEncode(255, (int)g, (int)g, (int)g);
     return;
   }
   if (syntax.FindTagParamFromStart(bStrokingOperation ? "RG" : "rg", 3)) {
     iColorType = COLORTYPE_RGB;
-    FX_FLOAT r = FX_atof((CFX_ByteString)syntax.GetWord()) * 255 + 0.5f;
-    FX_FLOAT g = FX_atof((CFX_ByteString)syntax.GetWord()) * 255 + 0.5f;
-    FX_FLOAT b = FX_atof((CFX_ByteString)syntax.GetWord()) * 255 + 0.5f;
+    FX_FLOAT r = FX_atof(syntax.GetWord()) * 255 + 0.5f;
+    FX_FLOAT g = FX_atof(syntax.GetWord()) * 255 + 0.5f;
+    FX_FLOAT b = FX_atof(syntax.GetWord()) * 255 + 0.5f;
     color = ArgbEncode(255, (int)r, (int)g, (int)b);
     return;
   }
   if (syntax.FindTagParamFromStart(bStrokingOperation ? "K" : "k", 4)) {
     iColorType = COLORTYPE_CMYK;
-    FX_FLOAT c = FX_atof((CFX_ByteString)syntax.GetWord());
-    FX_FLOAT m = FX_atof((CFX_ByteString)syntax.GetWord());
-    FX_FLOAT y = FX_atof((CFX_ByteString)syntax.GetWord());
-    FX_FLOAT k = FX_atof((CFX_ByteString)syntax.GetWord());
+    FX_FLOAT c = FX_atof(syntax.GetWord());
+    FX_FLOAT m = FX_atof(syntax.GetWord());
+    FX_FLOAT y = FX_atof(syntax.GetWord());
+    FX_FLOAT k = FX_atof(syntax.GetWord());
     FX_FLOAT r = 1.0f - std::min(1.0f, c + k);
     FX_FLOAT g = 1.0f - std::min(1.0f, m + k);
     FX_FLOAT b = 1.0f - std::min(1.0f, y + k);
@@ -235,7 +235,7 @@ FX_BOOL CPDF_DefaultAppearance::HasTextMatrix() {
   if (m_csDA.IsEmpty()) {
     return FALSE;
   }
-  CPDF_SimpleParser syntax(m_csDA);
+  CPDF_SimpleParser syntax(m_csDA.AsByteStringC());
   return syntax.FindTagParamFromStart("Tm", 6);
 }
 CFX_ByteString CPDF_DefaultAppearance::GetTextMatrixString() {
@@ -243,7 +243,7 @@ CFX_ByteString CPDF_DefaultAppearance::GetTextMatrixString() {
   if (m_csDA.IsEmpty()) {
     return csTM;
   }
-  CPDF_SimpleParser syntax(m_csDA);
+  CPDF_SimpleParser syntax(m_csDA.AsByteStringC());
   if (syntax.FindTagParamFromStart("Tm", 6)) {
     for (int i = 0; i < 6; i++) {
       csTM += (CFX_ByteString)syntax.GetWord();
@@ -258,11 +258,11 @@ CFX_Matrix CPDF_DefaultAppearance::GetTextMatrix() {
   if (m_csDA.IsEmpty()) {
     return tm;
   }
-  CPDF_SimpleParser syntax(m_csDA);
+  CPDF_SimpleParser syntax(m_csDA.AsByteStringC());
   if (syntax.FindTagParamFromStart("Tm", 6)) {
     FX_FLOAT f[6];
     for (int i = 0; i < 6; i++) {
-      f[i] = FX_atof((CFX_ByteString)syntax.GetWord());
+      f[i] = FX_atof(syntax.GetWord());
     }
     tm.Set(f[0], f[1], f[2], f[3], f[4], f[5]);
   }
@@ -387,7 +387,7 @@ CPDF_Font* GetInterFormFont(CPDF_Dictionary* pFormDict,
   if (!pFonts) {
     return NULL;
   }
-  CPDF_Dictionary* pElement = pFonts->GetDictBy(csAlias);
+  CPDF_Dictionary* pElement = pFonts->GetDictBy(csAlias.AsByteStringC());
   if (!pElement) {
     return NULL;
   }
@@ -606,7 +606,8 @@ void AddInterFormFont(CPDF_Dictionary*& pFormDict,
   csNameTag.Remove(' ');
   csNameTag =
       CPDF_InterForm::GenerateNewResourceName(pDR, "Font", 4, csNameTag);
-  pFonts->SetAtReference(csNameTag, pDocument, pFont->GetFontDict());
+  pFonts->SetAtReference(csNameTag.AsByteStringC(), pDocument,
+                         pFont->GetFontDict());
 }
 CPDF_Font* AddNativeInterFormFont(CPDF_Dictionary*& pFormDict,
                                   CPDF_Document* pDocument,
@@ -650,7 +651,7 @@ void RemoveInterFormFont(CPDF_Dictionary* pFormDict, const CPDF_Font* pFont) {
   }
   CPDF_Dictionary* pDR = pFormDict->GetDictBy("DR");
   CPDF_Dictionary* pFonts = pDR->GetDictBy("Font");
-  pFonts->RemoveAt(csTag);
+  pFonts->RemoveAt(csTag.AsByteStringC());
 }
 void RemoveInterFormFont(CPDF_Dictionary* pFormDict, CFX_ByteString csNameTag) {
   if (!pFormDict || csNameTag.IsEmpty()) {
@@ -664,7 +665,7 @@ void RemoveInterFormFont(CPDF_Dictionary* pFormDict, CFX_ByteString csNameTag) {
   if (!pFonts) {
     return;
   }
-  pFonts->RemoveAt(csNameTag);
+  pFonts->RemoveAt(csNameTag.AsByteStringC());
 }
 
 CPDF_Font* GetDefaultInterFormFont(CPDF_Dictionary* pFormDict,
diff --git a/core/fxcrt/fx_basic_buffer.cpp b/core/fxcrt/fx_basic_buffer.cpp
index 28c8ac0f32..de7bff2401 100644
--- a/core/fxcrt/fx_basic_buffer.cpp
+++ b/core/fxcrt/fx_basic_buffer.cpp
@@ -248,7 +248,7 @@ CFX_ArchiveSaver& CFX_ArchiveSaver::operator<<(const FX_WCHAR* wstr) {
 }
 CFX_ArchiveSaver& CFX_ArchiveSaver::operator<<(const CFX_WideString& wstr) {
   CFX_ByteString encoded = wstr.UTF16LE_Encode();
-  return operator<<(encoded);
+  return operator<<(encoded.AsByteStringC());
 }
 void CFX_ArchiveSaver::Write(const void* pData, FX_STRSIZE dwSize) {
   if (m_pStream) {
diff --git a/core/fxcrt/fx_xml_parser.cpp b/core/fxcrt/fx_xml_parser.cpp
index 9cdf73ca90..b39c32bfbd 100644
--- a/core/fxcrt/fx_xml_parser.cpp
+++ b/core/fxcrt/fx_xml_parser.cpp
@@ -371,7 +371,7 @@ CXML_Element* CXML_Parser::ParseElement(CXML_Element* pParent,
   }
   CXML_Element* pElement = new CXML_Element;
   pElement->m_pParent = pParent;
-  pElement->SetTag(tag_space, tag_name);
+  pElement->SetTag(tag_space.AsByteStringC(), tag_name.AsByteStringC());
   do {
     CFX_ByteString attr_space, attr_name;
     while (m_dwIndex < m_dwBufferSize) {
@@ -397,7 +397,8 @@ CXML_Element* CXML_Parser::ParseElement(CXML_Element* pParent,
       }
       CFX_WideString attr_value;
       GetAttrValue(attr_value);
-      pElement->m_AttrMap.SetAt(attr_space, attr_name, attr_value);
+      pElement->m_AttrMap.SetAt(attr_space.AsByteStringC(),
+                                attr_name.AsByteStringC(), attr_value);
     }
     m_nOffset = m_nBufferOffset + (FX_FILESIZE)m_dwIndex;
     if (m_dwIndex < m_dwBufferSize || IsEOF()) {
@@ -600,7 +601,7 @@ CFX_ByteString CXML_Element::GetNamespace(FX_BOOL bQualified) const {
   if (bQualified) {
     return m_QSpaceName;
   }
-  return GetNamespaceURI(m_QSpaceName);
+  return GetNamespaceURI(m_QSpaceName.AsByteStringC());
 }
 CFX_ByteString CXML_Element::GetNamespaceURI(
     const CFX_ByteStringC& qName) const {
diff --git a/core/fxcrt/fxcrt_posix.cpp b/core/fxcrt/fxcrt_posix.cpp
index 2f17e71567..0226313934 100644
--- a/core/fxcrt/fxcrt_posix.cpp
+++ b/core/fxcrt/fxcrt_posix.cpp
@@ -45,7 +45,7 @@ FX_BOOL CFXCRT_FileAccess_Posix::Open(const CFX_ByteStringC& fileName,
 }
 FX_BOOL CFXCRT_FileAccess_Posix::Open(const CFX_WideStringC& fileName,
                                       uint32_t dwMode) {
-  return Open(FX_UTF8Encode(fileName), dwMode);
+  return Open(FX_UTF8Encode(fileName).AsByteStringC(), dwMode);
 }
 void CFXCRT_FileAccess_Posix::Close() {
   if (m_nFD < 0) {
diff --git a/core/fxcrt/include/fx_basic.h b/core/fxcrt/include/fx_basic.h
index feeb6e756d..2ef11beb27 100644
--- a/core/fxcrt/include/fx_basic.h
+++ b/core/fxcrt/include/fx_basic.h
@@ -27,8 +27,8 @@ class CFX_BinaryBuf {
   void Clear();
   void EstimateSize(FX_STRSIZE size, FX_STRSIZE alloc_step = 0);
   void AppendBlock(const void* pBuf, FX_STRSIZE size);
-  void AppendString(const CFX_ByteStringC& str) {
-    AppendBlock(str.GetPtr(), str.GetLength());
+  void AppendString(const CFX_ByteString& str) {
+    AppendBlock(str.c_str(), str.GetLength());
   }
 
   void AppendByte(uint8_t byte) {
@@ -63,6 +63,12 @@ class CFX_ByteTextBuf : public CFX_BinaryBuf {
   CFX_ByteTextBuf& operator<<(int i);
   CFX_ByteTextBuf& operator<<(uint32_t i);
   CFX_ByteTextBuf& operator<<(double f);
+  CFX_ByteTextBuf& operator<<(const FX_CHAR* pStr) {
+    return *this << CFX_ByteStringC(pStr);
+  }
+  CFX_ByteTextBuf& operator<<(const CFX_ByteString& str) {
+    return *this << str.AsByteStringC();
+  }
   CFX_ByteTextBuf& operator<<(const CFX_ByteStringC& lpsz);
   CFX_ByteTextBuf& operator<<(const CFX_ByteTextBuf& buf);
 };
diff --git a/core/fxcrt/include/fx_string.h b/core/fxcrt/include/fx_string.h
index 9aa67845f8..cbf8c4de2f 100644
--- a/core/fxcrt/include/fx_string.h
+++ b/core/fxcrt/include/fx_string.h
@@ -61,8 +61,6 @@ class CFX_ByteStringC {
     m_Length = src.m_Length;
   }
 
-  CFX_ByteStringC(const CFX_ByteString& src);
-
   CFX_ByteStringC& operator=(const FX_CHAR* src) {
     m_Ptr = (const uint8_t*)src;
     m_Length = m_Ptr ? FXSYS_strlen(src) : 0;
@@ -167,12 +165,14 @@ class CFX_ByteString {
   static CFX_ByteString FromUnicode(const CFX_WideString& str);
 
   // Explicit conversion to C-style string.
+  // Note: |this| must outlive the use of the result.
   const FX_CHAR* c_str() const { return m_pData ? m_pData->m_String : ""; }
 
   // Implicit conversion to C-style string -- deprecated.
   operator const FX_CHAR*() const { return m_pData ? m_pData->m_String : ""; }
 
   // Explicit conversion to uint8_t*.
+  // Note: |this| must outlive the use of the result.
   const uint8_t* raw_str() const {
     return m_pData ? reinterpret_cast<const uint8_t*>(m_pData->m_String)
                    : nullptr;
@@ -184,6 +184,12 @@ class CFX_ByteString {
                    : nullptr;
   }
 
+  // Explicit conversion to CFX_ByteStringC.
+  // Note: |this| must outlive the use of the result.
+  CFX_ByteStringC AsByteStringC() const {
+    return CFX_ByteStringC(raw_str(), GetLength());
+  }
+
   FX_STRSIZE GetLength() const { return m_pData ? m_pData->m_nDataLength : 0; }
   bool IsEmpty() const { return !GetLength(); }
 
@@ -330,10 +336,6 @@ class CFX_ByteString {
   friend class fxcrt_ByteStringConcat_Test;
 };
 
-inline CFX_ByteStringC::CFX_ByteStringC(const CFX_ByteString& src) {
-  m_Ptr = (const uint8_t*)src;
-  m_Length = src.GetLength();
-}
 inline CFX_ByteStringC& CFX_ByteStringC::operator=(const CFX_ByteString& src) {
   m_Ptr = (const uint8_t*)src;
   m_Length = src.GetLength();
@@ -373,29 +375,29 @@ inline CFX_ByteString operator+(FX_CHAR ch, const CFX_ByteStringC& str2) {
 }
 inline CFX_ByteString operator+(const CFX_ByteString& str1,
                                 const CFX_ByteString& str2) {
-  return CFX_ByteString(str1, str2);
+  return CFX_ByteString(str1.AsByteStringC(), str2.AsByteStringC());
 }
 inline CFX_ByteString operator+(const CFX_ByteString& str1, FX_CHAR ch) {
-  return CFX_ByteString(str1, CFX_ByteStringC(ch));
+  return CFX_ByteString(str1.AsByteStringC(), CFX_ByteStringC(ch));
 }
 inline CFX_ByteString operator+(FX_CHAR ch, const CFX_ByteString& str2) {
-  return CFX_ByteString(ch, str2);
+  return CFX_ByteString(ch, str2.AsByteStringC());
 }
 inline CFX_ByteString operator+(const CFX_ByteString& str1,
                                 const FX_CHAR* str2) {
-  return CFX_ByteString(str1, str2);
+  return CFX_ByteString(str1.AsByteStringC(), str2);
 }
 inline CFX_ByteString operator+(const FX_CHAR* str1,
                                 const CFX_ByteString& str2) {
-  return CFX_ByteString(str1, str2);
+  return CFX_ByteString(str1, str2.AsByteStringC());
 }
 inline CFX_ByteString operator+(const CFX_ByteString& str1,
                                 const CFX_ByteStringC& str2) {
-  return CFX_ByteString(str1, str2);
+  return CFX_ByteString(str1.AsByteStringC(), str2);
 }
 inline CFX_ByteString operator+(const CFX_ByteStringC& str1,
                                 const CFX_ByteString& str2) {
-  return CFX_ByteString(str1, str2);
+  return CFX_ByteString(str1, str2.AsByteStringC());
 }
 
 class CFX_WideStringC {
@@ -758,7 +760,7 @@ inline CFX_ByteString FX_UTF8Encode(const CFX_WideString& wsStr) {
 
 FX_FLOAT FX_atof(const CFX_ByteStringC& str);
 inline FX_FLOAT FX_atof(const CFX_WideStringC& wsStr) {
-  return FX_atof(FX_UTF8Encode(wsStr.GetPtr(), wsStr.GetLength()));
+  return FX_atof(FX_UTF8Encode(wsStr.GetPtr(), wsStr.GetLength()).c_str());
 }
 void FX_atonum(const CFX_ByteStringC& str, FX_BOOL& bInteger, void* pData);
 FX_STRSIZE FX_ftoa(FX_FLOAT f, FX_CHAR* buf);
diff --git a/core/fxge/ge/fx_ge_ps.cpp b/core/fxge/ge/fx_ge_ps.cpp
index 32f2fce914..ec8f18e774 100644
--- a/core/fxge/ge/fx_ge_ps.cpp
+++ b/core/fxge/ge/fx_ge_ps.cpp
@@ -680,7 +680,7 @@ FX_BOOL CFX_PSRenderer::DrawText(int nChars,
     buf << pCharPos[i].m_OriginX << " " << pCharPos[i].m_OriginY << " m";
     CFX_ByteString hex;
     hex.Format("<%02X>", ps_glyphindex);
-    buf << hex << "Tj\n";
+    buf << hex.AsByteStringC() << "Tj\n";
   }
   buf << "Q\n";
   m_pOutput->OutputPS((const FX_CHAR*)buf.GetBuffer(), buf.GetSize());
diff --git a/core/fxge/win32/fx_win32_device.cpp b/core/fxge/win32/fx_win32_device.cpp
index cb3f331d49..ed57a02c23 100644
--- a/core/fxge/win32/fx_win32_device.cpp
+++ b/core/fxge/win32/fx_win32_device.cpp
@@ -460,7 +460,7 @@ IFX_SystemFontInfo* IFX_SystemFontInfo::CreateDefault(const char** pUnused) {
   if (path_len > 0 && path_len < MAX_PATH) {
     CFX_ByteString fonts_path(windows_path);
     fonts_path += "\\Fonts";
-    pInfoFallback->AddPath(fonts_path);
+    pInfoFallback->AddPath(fonts_path.AsByteStringC());
   }
   return pInfoFallback;
 }
diff --git a/fpdfsdk/formfiller/cba_fontmap.cpp b/fpdfsdk/formfiller/cba_fontmap.cpp
index c69dcbebcd..1ecf7d4de4 100644
--- a/fpdfsdk/formfiller/cba_fontmap.cpp
+++ b/fpdfsdk/formfiller/cba_fontmap.cpp
@@ -159,15 +159,15 @@ void CBA_FontMap::AddFontToAnnotDict(CPDF_Font* pFont,
   }
 
   // to avoid checkbox and radiobutton
-  CPDF_Object* pObject = pAPDict->GetObjectBy(m_sAPType);
+  CPDF_Object* pObject = pAPDict->GetObjectBy(m_sAPType.AsByteStringC());
   if (ToDictionary(pObject))
     return;
 
-  CPDF_Stream* pStream = pAPDict->GetStreamBy(m_sAPType);
+  CPDF_Stream* pStream = pAPDict->GetStreamBy(m_sAPType.AsByteStringC());
   if (!pStream) {
     pStream = new CPDF_Stream(NULL, 0, NULL);
     int32_t objnum = m_pDocument->AddIndirectObject(pStream);
-    pAPDict->SetAtReference(m_sAPType, m_pDocument, objnum);
+    pAPDict->SetAtReference(m_sAPType.AsByteStringC(), m_pDocument, objnum);
   }
 
   CPDF_Dictionary* pStreamDict = pStream->GetDict();
@@ -191,8 +191,8 @@ void CBA_FontMap::AddFontToAnnotDict(CPDF_Font* pFont,
         int32_t objnum = m_pDocument->AddIndirectObject(pStreamResFontList);
         pStreamResList->SetAtReference("Font", m_pDocument, objnum);
       }
-      if (!pStreamResFontList->KeyExist(sAlias))
-        pStreamResFontList->SetAtReference(sAlias, m_pDocument,
+      if (!pStreamResFontList->KeyExist(sAlias.AsByteStringC()))
+        pStreamResFontList->SetAtReference(sAlias.AsByteStringC(), m_pDocument,
                                            pFont->GetFontDict());
     }
   }
@@ -221,14 +221,14 @@ CPDF_Font* CBA_FontMap::GetAnnotDefaultFont(CFX_ByteString& sAlias) {
   CPDF_Dictionary* pFontDict = NULL;
 
   if (!sDA.IsEmpty()) {
-    CPDF_SimpleParser syntax(sDA);
+    CPDF_SimpleParser syntax(sDA.AsByteStringC());
     syntax.FindTagParamFromStart("Tf", 2);
     CFX_ByteString sFontName = syntax.GetWord();
     sAlias = PDF_NameDecode(sFontName).Mid(1);
 
     if (CPDF_Dictionary* pDRDict = m_pAnnotDict->GetDictBy("DR"))
       if (CPDF_Dictionary* pDRFontDict = pDRDict->GetDictBy("Font"))
-        pFontDict = pDRFontDict->GetDictBy(sAlias);
+        pFontDict = pDRFontDict->GetDictBy(sAlias.AsByteStringC());
 
     if (!pFontDict)
       if (CPDF_Dictionary* pAPDict = m_pAnnotDict->GetDictBy("AP"))
@@ -237,14 +237,14 @@ CPDF_Font* CBA_FontMap::GetAnnotDefaultFont(CFX_ByteString& sAlias) {
                   pNormalDict->GetDictBy("Resources"))
             if (CPDF_Dictionary* pResFontDict =
                     pNormalResDict->GetDictBy("Font"))
-              pFontDict = pResFontDict->GetDictBy(sAlias);
+              pFontDict = pResFontDict->GetDictBy(sAlias.AsByteStringC());
 
     if (bWidget) {
       if (!pFontDict) {
         if (pAcroFormDict) {
           if (CPDF_Dictionary* pDRDict = pAcroFormDict->GetDictBy("DR"))
             if (CPDF_Dictionary* pDRFontDict = pDRDict->GetDictBy("Font"))
-              pFontDict = pDRFontDict->GetDictBy(sAlias);
+              pFontDict = pDRFontDict->GetDictBy(sAlias.AsByteStringC());
         }
       }
     }
diff --git a/fpdfsdk/fpdf_ext.cpp b/fpdfsdk/fpdf_ext.cpp
index 484993c6a1..a1009c5cdf 100644
--- a/fpdfsdk/fpdf_ext.cpp
+++ b/fpdfsdk/fpdf_ext.cpp
@@ -104,10 +104,11 @@ FX_BOOL CheckSharedForm(const CXML_Element* pElement, CFX_ByteString cbName) {
     pElement->GetAttrByIndex(i, space, name, value);
     if (space == "xmlns" && name == "adhocwf" &&
         value == L"http://ns.adobe.com/AcrobatAdhocWorkflow/1.0/") {
-      CXML_Element* pVersion = pElement->GetElement("adhocwf", cbName);
+      CXML_Element* pVersion =
+          pElement->GetElement("adhocwf", cbName.AsByteStringC());
       if (!pVersion)
         continue;
-      CFX_WideString wsContent = pVersion->GetContent(0);  // == 1.1
+      CFX_WideString wsContent = pVersion->GetContent(0);
       int nType = wsContent.GetInteger();
       switch (nType) {
         case 1:
diff --git a/fpdfsdk/fpdf_flatten.cpp b/fpdfsdk/fpdf_flatten.cpp
index 46501865e5..bbd5ad3dd3 100644
--- a/fpdfsdk/fpdf_flatten.cpp
+++ b/fpdfsdk/fpdf_flatten.cpp
@@ -395,8 +395,7 @@ DLLEXPORT int STDCALL FPDFPage_Flatten(FPDF_PAGE page, int nFlag) {
       char sExtend[5] = {};
       FXSYS_itoa(iKey, sExtend, 10);
       key = CFX_ByteString("FFT") + CFX_ByteString(sExtend);
-
-      if (!pPageXObject->KeyExist(key))
+      if (!pPageXObject->KeyExist(key.AsByteStringC()))
         break;
     }
   }
@@ -406,7 +405,7 @@ DLLEXPORT int STDCALL FPDFPage_Flatten(FPDF_PAGE page, int nFlag) {
   CPDF_Dictionary* pNewXORes = NULL;
 
   if (!key.IsEmpty()) {
-    pPageXObject->SetAtReference(key, pDocument, dwObjNum);
+    pPageXObject->SetAtReference(key.AsByteStringC(), pDocument, dwObjNum);
     CPDF_Dictionary* pNewOXbjectDic = pNewXObject->GetDict();
     pNewXORes = new CPDF_Dictionary;
     pNewOXbjectDic->SetAt("Resources", pNewXORes);
@@ -438,7 +437,7 @@ DLLEXPORT int STDCALL FPDFPage_Flatten(FPDF_PAGE page, int nFlag) {
         continue;
 
       if (!sAnnotState.IsEmpty()) {
-        pAPStream = pAPDic->GetStreamBy(sAnnotState);
+        pAPStream = pAPDic->GetStreamBy(sAnnotState.AsByteStringC());
       } else {
         auto it = pAPDic->begin();
         if (it != pAPDic->end()) {
@@ -487,7 +486,7 @@ DLLEXPORT int STDCALL FPDFPage_Flatten(FPDF_PAGE page, int nFlag) {
     CFX_ByteString sFormName;
     sFormName.Format("F%d", i);
     uint32_t dwObjNum = pDocument->AddIndirectObject(pObj);
-    pXObject->SetAtReference(sFormName, pDocument, dwObjNum);
+    pXObject->SetAtReference(sFormName.AsByteStringC(), pDocument, dwObjNum);
 
     CPDF_StreamAcc acc;
     acc.LoadAllData(pNewXObject);
diff --git a/fpdfsdk/fpdfppo.cpp b/fpdfsdk/fpdfppo.cpp
index cab2c6c3e0..21d8c7d9ae 100644
--- a/fpdfsdk/fpdfppo.cpp
+++ b/fpdfsdk/fpdfppo.cpp
@@ -110,9 +110,9 @@ FX_BOOL CPDF_PageOrganizer::ExportPage(CPDF_Document* pSrcPDFDoc,
       const CFX_ByteString& cbSrcKeyStr = it.first;
       CPDF_Object* pObj = it.second;
       if (cbSrcKeyStr.Compare(("Type")) && cbSrcKeyStr.Compare(("Parent"))) {
-        if (pCurPageDict->KeyExist(cbSrcKeyStr))
-          pCurPageDict->RemoveAt(cbSrcKeyStr);
-        pCurPageDict->SetAt(cbSrcKeyStr, pObj->Clone());
+        if (pCurPageDict->KeyExist(cbSrcKeyStr.AsByteStringC()))
+          pCurPageDict->RemoveAt(cbSrcKeyStr.AsByteStringC());
+        pCurPageDict->SetAt(cbSrcKeyStr.AsByteStringC(), pObj->Clone());
       }
     }
 
@@ -229,7 +229,7 @@ FX_BOOL CPDF_PageOrganizer::UpdateReference(CPDF_Object* pObj,
         }
         if (pNextObj) {
           if (!UpdateReference(pNextObj, pDoc, pObjNumberMap))
-            pDict->RemoveAt(key);
+            pDict->RemoveAt(key.AsByteStringC());
         } else {
           return FALSE;
         }
diff --git a/fpdfsdk/fsdk_baseannot.cpp b/fpdfsdk/fsdk_baseannot.cpp
index 07a47cdff9..249fd83fc8 100644
--- a/fpdfsdk/fsdk_baseannot.cpp
+++ b/fpdfsdk/fsdk_baseannot.cpp
@@ -831,24 +831,22 @@ void CPDFSDK_BAAnnot::WriteAppearance(const CFX_ByteString& sAPType,
 
   if (sAPState.IsEmpty()) {
     pParentDict = pAPDict;
-    pStream = pAPDict->GetStreamBy(sAPType);
+    pStream = pAPDict->GetStreamBy(sAPType.AsByteStringC());
   } else {
-    CPDF_Dictionary* pAPTypeDict = pAPDict->GetDictBy(sAPType);
+    CPDF_Dictionary* pAPTypeDict = pAPDict->GetDictBy(sAPType.AsByteStringC());
     if (!pAPTypeDict) {
       pAPTypeDict = new CPDF_Dictionary;
-      pAPDict->SetAt(sAPType, pAPTypeDict);
+      pAPDict->SetAt(sAPType.AsByteStringC(), pAPTypeDict);
     }
-
     pParentDict = pAPTypeDict;
-    pStream = pAPTypeDict->GetStreamBy(sAPState);
+    pStream = pAPTypeDict->GetStreamBy(sAPState.AsByteStringC());
   }
 
   if (!pStream) {
     pStream = new CPDF_Stream(nullptr, 0, nullptr);
-
     CPDF_Document* pDoc = m_pPageView->GetPDFDocument();
     int32_t objnum = pDoc->AddIndirectObject(pStream);
-    pParentDict->SetAtReference(sAPType, pDoc, objnum);
+    pParentDict->SetAtReference(sAPType.AsByteStringC(), pDoc, objnum);
   }
 
   CPDF_Dictionary* pStreamDict = pStream->GetDict();
diff --git a/fpdfsdk/fsdk_baseform.cpp b/fpdfsdk/fsdk_baseform.cpp
index be92b4a7e2..d195d87fc1 100644
--- a/fpdfsdk/fsdk_baseform.cpp
+++ b/fpdfsdk/fsdk_baseform.cpp
@@ -466,7 +466,7 @@ FX_BOOL CPDFSDK_Widget::IsWidgetAppearanceValid(
     case FIELDTYPE_CHECKBOX:
     case FIELDTYPE_RADIOBUTTON:
       if (CPDF_Dictionary* pSubDict = psub->AsDictionary()) {
-        return pSubDict->GetStreamBy(GetAppState()) != NULL;
+        return !!pSubDict->GetStreamBy(GetAppState().AsByteStringC());
       }
       return FALSE;
   }
@@ -1813,7 +1813,7 @@ void CPDFSDK_Widget::AddImageToAppearance(const CFX_ByteString& sAPType,
   ASSERT(pDoc);
 
   CPDF_Dictionary* pAPDict = m_pAnnot->GetAnnotDict()->GetDictBy("AP");
-  CPDF_Stream* pStream = pAPDict->GetStreamBy(sAPType);
+  CPDF_Stream* pStream = pAPDict->GetStreamBy(sAPType.AsByteStringC());
   CPDF_Dictionary* pStreamDict = pStream->GetDict();
   CFX_ByteString sImageAlias = "IMG";
 
@@ -1831,14 +1831,14 @@ void CPDFSDK_Widget::AddImageToAppearance(const CFX_ByteString& sAPType,
 
   if (pStreamResList) {
     CPDF_Dictionary* pXObject = new CPDF_Dictionary;
-    pXObject->SetAtReference(sImageAlias, pDoc, pImage);
+    pXObject->SetAtReference(sImageAlias.AsByteStringC(), pDoc, pImage);
     pStreamResList->SetAt("XObject", pXObject);
   }
 }
 
 void CPDFSDK_Widget::RemoveAppearance(const CFX_ByteString& sAPType) {
   if (CPDF_Dictionary* pAPDict = m_pAnnot->GetAnnotDict()->GetDictBy("AP")) {
-    pAPDict->RemoveAt(sAPType);
+    pAPDict->RemoveAt(sAPType.AsByteStringC());
   }
 }
 
diff --git a/fpdfsdk/fsdk_mgr.cpp b/fpdfsdk/fsdk_mgr.cpp
index 323128c9fe..cc228eb8b9 100644
--- a/fpdfsdk/fsdk_mgr.cpp
+++ b/fpdfsdk/fsdk_mgr.cpp
@@ -186,7 +186,7 @@ FX_BOOL CFX_SystemHandler::FindNativeTrueTypeFont(
     pFontMapper->LoadInstalledFonts();
 
   for (const auto& font : pFontMapper->m_InstalledTTFonts) {
-    if (font.Compare(sFontFaceName))
+    if (font.Compare(sFontFaceName.AsByteStringC()))
       return TRUE;
   }
 
diff --git a/fpdfsdk/fxedit/fxet_pageobjs.cpp b/fpdfsdk/fxedit/fxet_pageobjs.cpp
index 3f32d9d3e1..1133cab796 100644
--- a/fpdfsdk/fxedit/fxet_pageobjs.cpp
+++ b/fpdfsdk/fxedit/fxet_pageobjs.cpp
@@ -246,7 +246,8 @@ void IFX_Edit::DrawEdit(CFX_RenderDevice* pDevice,
             }
 
             sTextBuf << GetPDFWordString(pFontMap, word.nFontIndex, word.Word,
-                                         SubWord);
+                                         SubWord)
+                            .AsByteStringC();
           } else {
             DrawTextString(
                 pDevice, CFX_FloatPoint(word.ptWord.x + ptOffset.x,
@@ -359,7 +360,8 @@ void IFX_Edit::DrawRichEdit(CFX_RenderDevice* pDevice,
           }
 
           sTextBuf << GetPDFWordString(pFontMap, word.WordProps.nFontIndex,
-                                       word.Word, 0);
+                                       word.Word, 0)
+                          .AsByteStringC();
 
           if (word.WordProps.nWordStyle & PVTWORD_STYLE_UNDERLINE) {
             CFX_PathData pathUnderline;
@@ -502,7 +504,8 @@ void IFX_Edit::GeneratePageObjects(
             nOldFontIndex = word.nFontIndex;
           }
 
-          sTextBuf << GetPDFWordString(pFontMap, word.nFontIndex, word.Word, 0);
+          sTextBuf << GetPDFWordString(pFontMap, word.nFontIndex, word.Word, 0)
+                          .AsByteStringC();
           oldplace = place;
         }
       }
@@ -574,7 +577,8 @@ void IFX_Edit::GenerateRichPageObjects(
           }
 
           sTextBuf << GetPDFWordString(pFontMap, word.WordProps.nFontIndex,
-                                       word.Word, 0);
+                                       word.Word, 0)
+                          .AsByteStringC();
 
           if (word.WordProps.nWordStyle & PVTWORD_STYLE_UNDERLINE) {
             CFX_FloatRect rcUnderline = GetUnderLineRect(word);
diff --git a/fpdfsdk/pdfwindow/PWL_Edit.cpp b/fpdfsdk/pdfwindow/PWL_Edit.cpp
index f53f263470..64588f2dff 100644
--- a/fpdfsdk/pdfwindow/PWL_Edit.cpp
+++ b/fpdfsdk/pdfwindow/PWL_Edit.cpp
@@ -265,6 +265,7 @@ void CPWL_Edit::GetThisAppearanceStream(CFX_ByteTextBuf& sAppStream) {
       case PBS_SOLID: {
         sLine << "q\n" << GetBorderWidth() << " w\n"
               << CPWL_Utils::GetColorAppStream(GetBorderColor(), FALSE)
+                     .AsByteStringC()
               << " 2 J 0 j\n";
 
         for (int32_t i = 1; i < nCharArray; i++) {
@@ -281,6 +282,7 @@ void CPWL_Edit::GetThisAppearanceStream(CFX_ByteTextBuf& sAppStream) {
       case PBS_DASH: {
         sLine << "q\n" << GetBorderWidth() << " w\n"
               << CPWL_Utils::GetColorAppStream(GetBorderColor(), FALSE)
+                     .AsByteStringC()
               << " 2 J 0 j\n"
               << "[" << GetBorderDash().nDash << " " << GetBorderDash().nGap
               << "] " << GetBorderDash().nPhase << " d\n";
@@ -319,7 +321,8 @@ void CPWL_Edit::GetThisAppearanceStream(CFX_ByteTextBuf& sAppStream) {
 
   if (sEditSel.GetLength() > 0)
     sText << CPWL_Utils::GetColorAppStream(PWL_DEFAULT_SELBACKCOLOR)
-          << sEditSel;
+                 .AsByteStringC()
+          << sEditSel.AsByteStringC();
 
   wrTemp = CPWL_Utils::OverlapWordRange(wrVisible, wrSelBefore);
   CFX_ByteString sEditBefore = CPWL_Utils::GetEditAppStream(
@@ -327,8 +330,9 @@ void CPWL_Edit::GetThisAppearanceStream(CFX_ByteTextBuf& sAppStream) {
       m_pEdit->GetPasswordChar());
 
   if (sEditBefore.GetLength() > 0)
-    sText << "BT\n" << CPWL_Utils::GetColorAppStream(GetTextColor())
-          << sEditBefore << "ET\n";
+    sText << "BT\n"
+          << CPWL_Utils::GetColorAppStream(GetTextColor()).AsByteStringC()
+          << sEditBefore.AsByteStringC() << "ET\n";
 
   wrTemp = CPWL_Utils::OverlapWordRange(wrVisible, wrSelect);
   CFX_ByteString sEditMid = CPWL_Utils::GetEditAppStream(
@@ -338,7 +342,8 @@ void CPWL_Edit::GetThisAppearanceStream(CFX_ByteTextBuf& sAppStream) {
   if (sEditMid.GetLength() > 0)
     sText << "BT\n"
           << CPWL_Utils::GetColorAppStream(CPWL_Color(COLORTYPE_GRAY, 1))
-          << sEditMid << "ET\n";
+                 .AsByteStringC()
+          << sEditMid.AsByteStringC() << "ET\n";
 
   wrTemp = CPWL_Utils::OverlapWordRange(wrVisible, wrSelAfter);
   CFX_ByteString sEditAfter = CPWL_Utils::GetEditAppStream(
@@ -346,8 +351,9 @@ void CPWL_Edit::GetThisAppearanceStream(CFX_ByteTextBuf& sAppStream) {
       m_pEdit->GetPasswordChar());
 
   if (sEditAfter.GetLength() > 0)
-    sText << "BT\n" << CPWL_Utils::GetColorAppStream(GetTextColor())
-          << sEditAfter << "ET\n";
+    sText << "BT\n"
+          << CPWL_Utils::GetColorAppStream(GetTextColor()).AsByteStringC()
+          << sEditAfter.AsByteStringC() << "ET\n";
 
   if (HasFlag(PES_SPELLCHECK)) {
     CFX_ByteString sSpellCheck = CPWL_Utils::GetSpellCheckAppStream(
@@ -355,7 +361,8 @@ void CPWL_Edit::GetThisAppearanceStream(CFX_ByteTextBuf& sAppStream) {
     if (sSpellCheck.GetLength() > 0)
       sText << CPWL_Utils::GetColorAppStream(CPWL_Color(COLORTYPE_RGB, 1, 0, 0),
                                              FALSE)
-            << sSpellCheck;
+                   .AsByteStringC()
+            << sSpellCheck.AsByteStringC();
   }
 
   if (sText.GetLength() > 0) {
@@ -742,8 +749,9 @@ CFX_ByteString CPWL_Edit::GetTextAppearanceStream(
   CFX_ByteString sEdit = CPWL_Utils::GetEditAppStream(m_pEdit, ptOffset);
 
   if (sEdit.GetLength() > 0) {
-    sRet << "BT\n" << CPWL_Utils::GetColorAppStream(GetTextColor()) << sEdit
-         << "ET\n";
+    sRet << "BT\n"
+         << CPWL_Utils::GetColorAppStream(GetTextColor()).AsByteStringC()
+         << sEdit.AsByteStringC() << "ET\n";
   }
 
   return sRet.GetByteString();
diff --git a/fpdfsdk/pdfwindow/PWL_Icon.cpp b/fpdfsdk/pdfwindow/PWL_Icon.cpp
index 560f8e0e32..69f9e599da 100644
--- a/fpdfsdk/pdfwindow/PWL_Icon.cpp
+++ b/fpdfsdk/pdfwindow/PWL_Icon.cpp
@@ -42,7 +42,7 @@ CFX_ByteString CPWL_Image::GetImageAppStream() {
     sAppStream << mt.GetA() << " " << mt.GetB() << " " << mt.GetC() << " "
                << mt.GetD() << " " << mt.GetE() << " " << mt.GetF() << " cm\n";
 
-    sAppStream << "0 g 0 G 1 w /" << sAlias << " Do\n"
+    sAppStream << "0 g 0 G 1 w /" << sAlias.AsByteStringC() << " Do\n"
                << "Q\n";
   }
 
diff --git a/fpdfsdk/pdfwindow/PWL_Label.cpp b/fpdfsdk/pdfwindow/PWL_Label.cpp
index cfbeb4362c..8c5b0676d7 100644
--- a/fpdfsdk/pdfwindow/PWL_Label.cpp
+++ b/fpdfsdk/pdfwindow/PWL_Label.cpp
@@ -118,7 +118,8 @@ CFX_FloatRect CPWL_Label::GetContentRect() const {
 void CPWL_Label::GetThisAppearanceStream(CFX_ByteTextBuf& sAppStream) {
   CPWL_Wnd::GetThisAppearanceStream(sAppStream);
 
-  sAppStream << GetTextAppearanceStream(CFX_FloatPoint(0.0f, 0.0f));
+  sAppStream << GetTextAppearanceStream(CFX_FloatPoint(0.0f, 0.0f))
+                    .AsByteStringC();
 }
 
 CFX_ByteString CPWL_Label::GetTextAppearanceStream(
@@ -127,8 +128,9 @@ CFX_ByteString CPWL_Label::GetTextAppearanceStream(
   CFX_ByteString sEdit = CPWL_Utils::GetEditAppStream(m_pEdit, ptOffset);
 
   if (sEdit.GetLength() > 0) {
-    sRet << "BT\n" << CPWL_Utils::GetColorAppStream(GetTextColor()) << sEdit
-         << "ET\n";
+    sRet << "BT\n"
+         << CPWL_Utils::GetColorAppStream(GetTextColor()).AsByteStringC()
+         << sEdit.AsByteStringC() << "ET\n";
   }
 
   return sRet.GetByteString();
diff --git a/fpdfsdk/pdfwindow/PWL_ListBox.cpp b/fpdfsdk/pdfwindow/PWL_ListBox.cpp
index d39d8419a6..ccccc77dcd 100644
--- a/fpdfsdk/pdfwindow/PWL_ListBox.cpp
+++ b/fpdfsdk/pdfwindow/PWL_ListBox.cpp
@@ -118,21 +118,25 @@ void CPWL_ListBox::GetThisAppearanceStream(CFX_ByteTextBuf& sAppStream) {
 
       CFX_FloatPoint ptOffset(rcItem.left, (rcItem.top + rcItem.bottom) * 0.5f);
       if (m_pList->IsItemSelected(i)) {
-        sListItems << CPWL_Utils::GetRectFillAppStream(
-            rcItem, PWL_DEFAULT_SELBACKCOLOR);
+        sListItems << CPWL_Utils::GetRectFillAppStream(rcItem,
+                                                       PWL_DEFAULT_SELBACKCOLOR)
+                          .AsByteStringC();
         CFX_ByteString sItem =
             CPWL_Utils::GetEditAppStream(m_pList->GetItemEdit(i), ptOffset);
         if (sItem.GetLength() > 0) {
           sListItems << "BT\n"
                      << CPWL_Utils::GetColorAppStream(PWL_DEFAULT_SELTEXTCOLOR)
-                     << sItem << "ET\n";
+                            .AsByteStringC()
+                     << sItem.AsByteStringC() << "ET\n";
         }
       } else {
         CFX_ByteString sItem =
             CPWL_Utils::GetEditAppStream(m_pList->GetItemEdit(i), ptOffset);
         if (sItem.GetLength() > 0) {
-          sListItems << "BT\n" << CPWL_Utils::GetColorAppStream(GetTextColor())
-                     << sItem << "ET\n";
+          sListItems << "BT\n"
+                     << CPWL_Utils::GetColorAppStream(GetTextColor())
+                            .AsByteStringC()
+                     << sItem.AsByteStringC() << "ET\n";
         }
       }
     }
diff --git a/fpdfsdk/pdfwindow/PWL_ScrollBar.cpp b/fpdfsdk/pdfwindow/PWL_ScrollBar.cpp
index 9db2aea35b..a96cf5f2a5 100644
--- a/fpdfsdk/pdfwindow/PWL_ScrollBar.cpp
+++ b/fpdfsdk/pdfwindow/PWL_ScrollBar.cpp
@@ -670,7 +670,8 @@ void CPWL_ScrollBar::GetThisAppearanceStream(CFX_ByteTextBuf& sAppStream) {
 
     sButton << "q\n";
     sButton << "0 w\n"
-            << CPWL_Utils::GetColorAppStream(GetBackgroundColor(), TRUE);
+            << CPWL_Utils::GetColorAppStream(GetBackgroundColor(), TRUE)
+                   .AsByteStringC();
     sButton << rectWnd.left << " " << rectWnd.bottom << " "
             << rectWnd.right - rectWnd.left << " "
             << rectWnd.top - rectWnd.bottom << " re b Q\n";
diff --git a/fpdfsdk/pdfwindow/PWL_Signature.cpp b/fpdfsdk/pdfwindow/PWL_Signature.cpp
index 72b6ebe7c3..221922972f 100644
--- a/fpdfsdk/pdfwindow/PWL_Signature.cpp
+++ b/fpdfsdk/pdfwindow/PWL_Signature.cpp
@@ -42,7 +42,7 @@ void CPWL_Signature_Image::DrawThisAppearance(CFX_RenderDevice* pDevice,
 
 void CPWL_Signature_Image::GetThisAppearanceStream(
     CFX_ByteTextBuf& sAppStream) {
-  sAppStream << CPWL_Image::GetImageAppStream();
+  sAppStream << CPWL_Image::GetImageAppStream().AsByteStringC();
 }
 
 void CPWL_Signature_Image::GetScale(FX_FLOAT& fHScale, FX_FLOAT& fVScale) {
diff --git a/xfa/fee/fde_txtedtengine.cpp b/xfa/fee/fde_txtedtengine.cpp
index d397afd7e3..19b5b24311 100644
--- a/xfa/fee/fde_txtedtengine.cpp
+++ b/xfa/fee/fde_txtedtengine.cpp
@@ -391,7 +391,7 @@ int32_t CFDE_TxtEdtEngine::Insert(int32_t nStart,
         new CFDE_TxtEdtDoRecord_Insert(this, m_nCaret, lpBuffer, nLength);
     CFX_ByteString bsDoRecord;
     pRecord->Serialize(bsDoRecord);
-    m_Param.pEventSink->On_AddDoRecord(this, bsDoRecord);
+    m_Param.pEventSink->On_AddDoRecord(this, bsDoRecord.AsByteStringC());
     pRecord->Release();
   }
   GetText(m_ChangeInfo.wsPrevText, 0);
@@ -454,7 +454,7 @@ int32_t CFDE_TxtEdtEngine::Delete(int32_t nStart, FX_BOOL bBackspace) {
         new CFDE_TxtEdtDoRecord_DeleteRange(this, nStart, m_nCaret, wsRange);
     CFX_ByteString bsDoRecord;
     pRecord->Serialize(bsDoRecord);
-    m_Param.pEventSink->On_AddDoRecord(this, bsDoRecord);
+    m_Param.pEventSink->On_AddDoRecord(this, bsDoRecord.AsByteStringC());
     pRecord->Release();
   }
   m_ChangeInfo.nChangeType = FDE_TXTEDT_TEXTCHANGE_TYPE_Delete;
@@ -944,7 +944,7 @@ void CFDE_TxtEdtEngine::DeleteRange_DoRecord(int32_t nStart,
         this, nStart, m_nCaret, wsRange, bSel);
     CFX_ByteString bsDoRecord;
     pRecord->Serialize(bsDoRecord);
-    m_Param.pEventSink->On_AddDoRecord(this, bsDoRecord);
+    m_Param.pEventSink->On_AddDoRecord(this, bsDoRecord.AsByteStringC());
     pRecord->Release();
   }
   m_ChangeInfo.nChangeType = FDE_TXTEDT_TEXTCHANGE_TYPE_Delete;
diff --git a/xfa/fgas/localization/fgas_locale.cpp b/xfa/fgas/localization/fgas_locale.cpp
index 2d72454038..8cf80ce4f1 100644
--- a/xfa/fgas/localization/fgas_locale.cpp
+++ b/xfa/fgas/localization/fgas_locale.cpp
@@ -111,12 +111,12 @@ void CFX_Locale::GetNumbericSymbol(FX_LOCALENUMSYMBOL eType,
   CFX_ByteString bsSpace;
   CFX_WideString wsName = gs_LocalNumberSymbols[eType];
   CXML_Element* pNumberSymbols =
-      m_pElement->GetElement(bsSpace, "numberSymbols");
+      m_pElement->GetElement(bsSpace.AsByteStringC(), "numberSymbols");
   if (!pNumberSymbols) {
     return;
   }
-  wsNumSymbol =
-      FX_GetXMLContent(bsSpace, pNumberSymbols, "numberSymbol", wsName);
+  wsNumSymbol = FX_GetXMLContent(bsSpace.AsByteStringC(), pNumberSymbols,
+                                 "numberSymbol", wsName);
 }
 void CFX_Locale::GetDateTimeSymbols(CFX_WideString& wsDtSymbol) const {
   if (!m_pElement) {
@@ -124,7 +124,7 @@ void CFX_Locale::GetDateTimeSymbols(CFX_WideString& wsDtSymbol) const {
   }
   CFX_ByteString bsSpace;
   CXML_Element* pNumberSymbols =
-      m_pElement->GetElement(bsSpace, "dateTimeSymbols");
+      m_pElement->GetElement(bsSpace.AsByteStringC(), "dateTimeSymbols");
   if (!pNumberSymbols) {
     return;
   }
@@ -137,20 +137,23 @@ static void FX_GetCalendarSymbol(CXML_Element* pXmlElement,
                                  CFX_WideString& wsName) {
   CFX_ByteString bsSpace;
   CFX_ByteString pstrSymbolNames = symbol_type + "Names";
-  CXML_Element* pChild = pXmlElement->GetElement(bsSpace, "calendarSymbols");
+  CXML_Element* pChild =
+      pXmlElement->GetElement(bsSpace.AsByteStringC(), "calendarSymbols");
   if (!pChild) {
     return;
   }
-  CXML_Element* pSymbolNames = pChild->GetElement(bsSpace, pstrSymbolNames);
+  CXML_Element* pSymbolNames = pChild->GetElement(
+      bsSpace.AsByteStringC(), pstrSymbolNames.AsByteStringC());
   if (!pSymbolNames) {
     return;
   }
   if (pSymbolNames->GetAttrInteger("abbr") != bAbbr) {
-    pSymbolNames = pChild->GetElement(bsSpace, pstrSymbolNames, 1);
+    pSymbolNames = pChild->GetElement(bsSpace.AsByteStringC(),
+                                      pstrSymbolNames.AsByteStringC(), 1);
   }
   if (pSymbolNames && pSymbolNames->GetAttrInteger("abbr") == bAbbr) {
-    CXML_Element* pSymbolName =
-        pSymbolNames->GetElement(bsSpace, symbol_type, index);
+    CXML_Element* pSymbolName = pSymbolNames->GetElement(
+        bsSpace.AsByteStringC(), symbol_type.AsByteStringC(), index);
     if (pSymbolName) {
       wsName = pSymbolName->GetContent(0);
     }
@@ -228,13 +231,13 @@ static void FX_GetPattern(CXML_Element* pXmlElement,
                           const CFX_WideString& wsSubCategory,
                           CFX_WideString& wsPattern) {
   CFX_ByteString bsSpace;
-  CXML_Element* pDatePatterns =
-      pXmlElement->GetElement(bsSpace, bsCategory + "s");
+  CXML_Element* pDatePatterns = pXmlElement->GetElement(
+      bsSpace.AsByteStringC(), (bsCategory + "s").AsByteStringC());
   if (!pDatePatterns) {
     return;
   }
-  wsPattern =
-      FX_GetXMLContent(bsSpace, pDatePatterns, bsCategory, wsSubCategory);
+  wsPattern = FX_GetXMLContent(bsSpace.AsByteStringC(), pDatePatterns,
+                               bsCategory.AsByteStringC(), wsSubCategory);
 }
 static void FX_GetDateTimePattern(CXML_Element* pXmlElement,
                                   const CFX_ByteString& bsCategory,
diff --git a/xfa/fwl/basewidget/fwl_editimp.cpp b/xfa/fwl/basewidget/fwl_editimp.cpp
index d5aa2c0507..008936c90e 100644
--- a/xfa/fwl/basewidget/fwl_editimp.cpp
+++ b/xfa/fwl/basewidget/fwl_editimp.cpp
@@ -734,14 +734,14 @@ FX_BOOL CFWL_EditImp::Undo() {
     return FALSE;
   }
   CFX_ByteString bsRecord = m_RecordArr[m_iCurRecord--];
-  return Undo(bsRecord);
+  return Undo(bsRecord.AsByteStringC());
 }
 FX_BOOL CFWL_EditImp::Redo() {
   if (!CanRedo()) {
     return FALSE;
   }
   CFX_ByteString bsRecord = m_RecordArr[++m_iCurRecord];
-  return Redo(bsRecord);
+  return Redo(bsRecord.AsByteStringC());
 }
 FX_BOOL CFWL_EditImp::CanUndo() {
   return m_iCurRecord >= 0;
diff --git a/xfa/fxbarcode/oned/BC_OnedCodaBarReader.cpp b/xfa/fxbarcode/oned/BC_OnedCodaBarReader.cpp
index 5f8a0c25aa..f767ffa169 100644
--- a/xfa/fxbarcode/oned/BC_OnedCodaBarReader.cpp
+++ b/xfa/fxbarcode/oned/BC_OnedCodaBarReader.cpp
@@ -106,7 +106,8 @@ CFX_ByteString CBC_OnedCodaBarReader::DecodeRow(int32_t rowNumber,
     }
   }
   if (result.GetLength() < 5) {
-    int32_t index = temp.Find(result.Mid(1, result.GetLength() - 1));
+    int32_t index =
+        temp.Find(result.Mid(1, result.GetLength() - 1).AsByteStringC());
     if (index == len - (result.GetLength() - 1)) {
       e = BCExceptionNotFound;
       return "";
diff --git a/xfa/fxfa/app/xfa_checksum.cpp b/xfa/fxfa/app/xfa_checksum.cpp
index aac5456b63..c76ec505e9 100644
--- a/xfa/fxfa/app/xfa_checksum.cpp
+++ b/xfa/fxfa/app/xfa_checksum.cpp
@@ -73,7 +73,7 @@ void CXFA_SAXReaderHandler::OnTagClose(void* pTag, uint32_t dwEndPos) {
   if (pSAXContext->m_eNode == FX_SAXNODE_Instruction) {
     textBuf << "?>";
   } else if (pSAXContext->m_eNode == FX_SAXNODE_Tag) {
-    textBuf << "></" << pSAXContext->m_bsTagName << ">";
+    textBuf << "></" << pSAXContext->m_bsTagName.AsByteStringC() << ">";
   }
   UpdateChecksum(FALSE);
 }
diff --git a/xfa/fxfa/app/xfa_fftextedit.cpp b/xfa/fxfa/app/xfa_fftextedit.cpp
index 085ec07d9f..fa530169e0 100644
--- a/xfa/fxfa/app/xfa_fftextedit.cpp
+++ b/xfa/fxfa/app/xfa_fftextedit.cpp
@@ -420,13 +420,13 @@ FWL_ERR CXFA_FFTextEdit::OnProcessEvent(CFWL_Event* pEvent) {
     case FWL_EVTHASH_EDT_CheckWord: {
       CFX_WideString wstr(L"FWL_EVENT_DTP_SelectChanged");
       CFWL_EvtEdtCheckWord* event = (CFWL_EvtEdtCheckWord*)pEvent;
-      event->bCheckWord = CheckWord(event->bsWord);
+      event->bCheckWord = CheckWord(event->bsWord.AsByteStringC());
       break;
     }
     case FWL_EVTHASH_EDT_GetSuggestWords: {
       CFWL_EvtEdtGetSuggestWords* event = (CFWL_EvtEdtGetSuggestWords*)pEvent;
-      event->bSuggestWords =
-          GetSuggestWords(event->bsWord, event->bsArraySuggestWords);
+      event->bSuggestWords = GetSuggestWords(event->bsWord.AsByteStringC(),
+                                             event->bsArraySuggestWords);
       break;
     }
     default: {}
diff --git a/xfa/fxfa/app/xfa_fontmgr.cpp b/xfa/fxfa/app/xfa_fontmgr.cpp
index e915dcbaf7..b9cfd6fb28 100644
--- a/xfa/fxfa/app/xfa_fontmgr.cpp
+++ b/xfa/fxfa/app/xfa_fontmgr.cpp
@@ -1861,7 +1861,8 @@ IFX_Font* CXFA_PDFFontMgr::FindFont(CFX_ByteString strPsName,
   for (const auto& it : *pFontSetDict) {
     const CFX_ByteString& key = it.first;
     CPDF_Object* pObj = it.second;
-    if (!PsNameMatchDRFontName(strPsName, bBold, bItalic, key, bStrictMatch)) {
+    if (!PsNameMatchDRFontName(strPsName.AsByteStringC(), bBold, bItalic, key,
+                               bStrictMatch)) {
       continue;
     }
     CPDF_Object* pDirect = pObj->GetDirect();
diff --git a/xfa/fxfa/fm2js/xfa_fm2jscontext.cpp b/xfa/fxfa/fm2js/xfa_fm2jscontext.cpp
index 73eaed6f5b..97eadbd3d5 100644
--- a/xfa/fxfa/fm2js/xfa_fm2jscontext.cpp
+++ b/xfa/fxfa/fm2js/xfa_fm2jscontext.cpp
@@ -315,8 +315,8 @@ void CXFA_FM2JSContext::Avg(FXJSE_HOBJECT hThis,
             FXJSE_HVALUE newPropertyValue = FXJSE_Value_Create(hruntime);
             for (int32_t j = 2; j < iLength; j++) {
               FXJSE_Value_GetObjectPropByIdx(argValue, j, jsObjectValue);
-              FXJSE_Value_GetObjectProp(jsObjectValue, propertyStr,
-                                        newPropertyValue);
+              FXJSE_Value_GetObjectProp(
+                  jsObjectValue, propertyStr.AsByteStringC(), newPropertyValue);
               if (!FXJSE_Value_IsNull(newPropertyValue)) {
                 dSum += HValueToDouble(hThis, newPropertyValue);
                 uCount++;
@@ -398,8 +398,8 @@ void CXFA_FM2JSContext::Count(FXJSE_HOBJECT hThis,
           FXJSE_Value_ToUTF8String(propertyValue, propertyStr);
           for (int32_t i = 2; i < iLength; i++) {
             FXJSE_Value_GetObjectPropByIdx(argValue, i, jsObjectValue);
-            FXJSE_Value_GetObjectProp(jsObjectValue, propertyStr,
-                                      newPropertyValue);
+            FXJSE_Value_GetObjectProp(
+                jsObjectValue, propertyStr.AsByteStringC(), newPropertyValue);
             uCount += (FXJSE_Value_IsNull(newPropertyValue) ? 0 : 1);
           }
         }
@@ -490,8 +490,8 @@ void CXFA_FM2JSContext::Max(FXJSE_HOBJECT hThis,
           FXJSE_Value_ToUTF8String(propertyValue, propertyStr);
           for (int32_t i = 2; i < iLength; i++) {
             FXJSE_Value_GetObjectPropByIdx(argValue, i, jsObjectValue);
-            FXJSE_Value_GetObjectProp(jsObjectValue, propertyStr,
-                                      newPropertyValue);
+            FXJSE_Value_GetObjectProp(
+                jsObjectValue, propertyStr.AsByteStringC(), newPropertyValue);
             if (!FXJSE_Value_IsNull(newPropertyValue)) {
               uCount++;
               if (uCount == 1) {
@@ -593,8 +593,8 @@ void CXFA_FM2JSContext::Min(FXJSE_HOBJECT hThis,
           FXJSE_Value_ToUTF8String(propertyValue, propertyStr);
           for (int32_t i = 2; i < iLength; i++) {
             FXJSE_Value_GetObjectPropByIdx(argValue, i, jsObjectValue);
-            FXJSE_Value_GetObjectProp(jsObjectValue, propertyStr,
-                                      newPropertyValue);
+            FXJSE_Value_GetObjectProp(
+                jsObjectValue, propertyStr.AsByteStringC(), newPropertyValue);
             if (!FXJSE_Value_IsNull(newPropertyValue)) {
               uCount++;
               if (uCount == 1) {
@@ -679,8 +679,8 @@ void CXFA_FM2JSContext::Mod(FXJSE_HOBJECT hThis,
             CFX_ByteString propertyStr;
             FXJSE_Value_ToUTF8String(propertyValue, propertyStr);
             FXJSE_HVALUE newPropertyValue = FXJSE_Value_Create(hruntime);
-            FXJSE_Value_GetObjectProp(jsObjectValue, propertyStr,
-                                      newPropertyValue);
+            FXJSE_Value_GetObjectProp(
+                jsObjectValue, propertyStr.AsByteStringC(), newPropertyValue);
             dDividend = HValueToDouble(hThis, newPropertyValue);
             FXJSE_Value_Release(newPropertyValue);
           }
@@ -708,8 +708,8 @@ void CXFA_FM2JSContext::Mod(FXJSE_HOBJECT hThis,
             CFX_ByteString propertyStr;
             FXJSE_Value_ToUTF8String(propertyValue, propertyStr);
             FXJSE_HVALUE newPropertyValue = FXJSE_Value_Create(hruntime);
-            FXJSE_Value_GetObjectProp(jsObjectValue, propertyStr,
-                                      newPropertyValue);
+            FXJSE_Value_GetObjectProp(
+                jsObjectValue, propertyStr.AsByteStringC(), newPropertyValue);
             dDividor = HValueToDouble(hThis, newPropertyValue);
             FXJSE_Value_Release(newPropertyValue);
           }
@@ -761,7 +761,7 @@ void CXFA_FM2JSContext::Round(FXJSE_HOBJECT hThis,
           CFX_ByteString propertyStr;
           FXJSE_Value_ToUTF8String(propertyValue, propertyStr);
           FXJSE_HVALUE newPropertyValue = FXJSE_Value_Create(hruntime);
-          FXJSE_Value_GetObjectProp(jsObjectValue, propertyStr,
+          FXJSE_Value_GetObjectProp(jsObjectValue, propertyStr.AsByteStringC(),
                                     newPropertyValue);
           dValue = HValueToDouble(hThis, newPropertyValue);
           FXJSE_Value_Release(newPropertyValue);
@@ -773,7 +773,8 @@ void CXFA_FM2JSContext::Round(FXJSE_HOBJECT hThis,
       }
       CFX_Decimal decimalValue((FX_FLOAT)dValue, uPrecision);
       CFX_WideString wsValue = decimalValue;
-      FXJSE_Value_SetUTF8String(args.GetReturnValue(), wsValue.UTF8Encode());
+      FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                wsValue.UTF8Encode().AsByteStringC());
     }
     FXJSE_Value_Release(argOne);
   } else if (argc == 2) {
@@ -794,7 +795,7 @@ void CXFA_FM2JSContext::Round(FXJSE_HOBJECT hThis,
           CFX_ByteString propertyStr;
           FXJSE_Value_ToUTF8String(propertyValue, propertyStr);
           FXJSE_HVALUE newPropertyValue = FXJSE_Value_Create(hruntime);
-          FXJSE_Value_GetObjectProp(jsObjectValue, propertyStr,
+          FXJSE_Value_GetObjectProp(jsObjectValue, propertyStr.AsByteStringC(),
                                     newPropertyValue);
           dValue = HValueToDouble(hThis, newPropertyValue);
           FXJSE_Value_Release(newPropertyValue);
@@ -816,7 +817,7 @@ void CXFA_FM2JSContext::Round(FXJSE_HOBJECT hThis,
           CFX_ByteString propertyStr;
           FXJSE_Value_ToUTF8String(propertyValue, propertyStr);
           FXJSE_HVALUE newPropertyValue = FXJSE_Value_Create(hruntime);
-          FXJSE_Value_GetObjectProp(jsObjectValue, propertyStr,
+          FXJSE_Value_GetObjectProp(jsObjectValue, propertyStr.AsByteStringC(),
                                     newPropertyValue);
           dPrecision = HValueToDouble(hThis, newPropertyValue);
           FXJSE_Value_Release(newPropertyValue);
@@ -835,7 +836,8 @@ void CXFA_FM2JSContext::Round(FXJSE_HOBJECT hThis,
       }
       CFX_Decimal decimalValue((FX_FLOAT)dValue, uPrecision);
       CFX_WideString wsValue = decimalValue;
-      FXJSE_Value_SetUTF8String(args.GetReturnValue(), wsValue.UTF8Encode());
+      FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                wsValue.UTF8Encode().AsByteStringC());
     }
     FXJSE_Value_Release(argOne);
     FXJSE_Value_Release(argTwo);
@@ -884,8 +886,8 @@ void CXFA_FM2JSContext::Sum(FXJSE_HOBJECT hThis,
             FXJSE_Value_ToUTF8String(propertyValue, propertyStr);
             for (int32_t j = 2; j < iLength; j++) {
               FXJSE_Value_GetObjectPropByIdx(argValue, j, jsObjectValue);
-              FXJSE_Value_GetObjectProp(jsObjectValue, propertyStr,
-                                        newPropertyValue);
+              FXJSE_Value_GetObjectProp(
+                  jsObjectValue, propertyStr.AsByteStringC(), newPropertyValue);
               if (!FXJSE_Value_IsNull(newPropertyValue)) {
                 dSum += HValueToDouble(hThis, newPropertyValue);
                 uCount++;
@@ -935,7 +937,7 @@ void CXFA_FM2JSContext::Date(FXJSE_HOBJECT hThis,
     bufferMon.Format("%02d", pTmStruct->tm_mon + 1);
     bufferDay.Format("%02d", pTmStruct->tm_mday);
     CFX_ByteString bufferCurrent = bufferYear + bufferMon + bufferDay;
-    int32_t dDays = DateString2Num(bufferCurrent);
+    int32_t dDays = DateString2Num(bufferCurrent.AsByteStringC());
     FXJSE_Value_SetInteger(args.GetReturnValue(), dDays);
   } else {
     CXFA_FM2JSContext* pContext =
@@ -979,11 +981,12 @@ void CXFA_FM2JSContext::Date2Num(FXJSE_HOBJECT hThis,
     }
     if (!bFlags) {
       CFX_ByteString szIsoDateString;
-      FX_BOOL bRet = Local2IsoDate(hThis, dateString, formatString, localString,
-                                   szIsoDateString);
+      FX_BOOL bRet = Local2IsoDate(
+          hThis, dateString.AsByteStringC(), formatString.AsByteStringC(),
+          localString.AsByteStringC(), szIsoDateString);
       if (bRet) {
         FXJSE_Value_SetInteger(args.GetReturnValue(),
-                               DateString2Num(szIsoDateString));
+                               DateString2Num(szIsoDateString.AsByteStringC()));
       } else {
         FXJSE_Value_SetInteger(args.GetReturnValue(), 0);
       }
@@ -1034,11 +1037,12 @@ void CXFA_FM2JSContext::DateFmt(FXJSE_HOBJECT hThis,
     }
     if (!bFlags) {
       CFX_ByteString formatStr;
-      GetStandardDateFormat(hThis, iStyle, szLocal, formatStr);
+      GetStandardDateFormat(hThis, iStyle, szLocal.AsByteStringC(), formatStr);
       if (formatStr.IsEmpty()) {
         formatStr = "";
       }
-      FXJSE_Value_SetUTF8String(args.GetReturnValue(), formatStr);
+      FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                formatStr.AsByteStringC());
     } else {
       FXJSE_Value_SetNull(args.GetReturnValue());
     }
@@ -1065,7 +1069,7 @@ void CXFA_FM2JSContext::IsoDate2Num(FXJSE_HOBJECT hThis,
     } else {
       CFX_ByteString szArgString;
       HValueToUTF8String(argOne, szArgString);
-      int32_t dDays = DateString2Num(szArgString);
+      int32_t dDays = DateString2Num(szArgString.AsByteStringC());
       FXJSE_Value_SetInteger(args.GetReturnValue(), (int32_t)dDays);
     }
     FXJSE_Value_Release(argOne);
@@ -1164,11 +1168,13 @@ void CXFA_FM2JSContext::LocalDateFmt(FXJSE_HOBJECT hThis,
     }
     if (!bFlags) {
       CFX_ByteString formatStr;
-      GetLocalDateFormat(hThis, iStyle, szLocal, formatStr, FALSE);
+      GetLocalDateFormat(hThis, iStyle, szLocal.AsByteStringC(), formatStr,
+                         FALSE);
       if (formatStr.IsEmpty()) {
         formatStr = "";
       }
-      FXJSE_Value_SetUTF8String(args.GetReturnValue(), formatStr);
+      FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                formatStr.AsByteStringC());
     } else {
       FXJSE_Value_SetNull(args.GetReturnValue());
     }
@@ -1215,11 +1221,13 @@ void CXFA_FM2JSContext::LocalTimeFmt(FXJSE_HOBJECT hThis,
     }
     if (!bFlags) {
       CFX_ByteString formatStr;
-      GetLocalTimeFormat(hThis, iStyle, szLocal, formatStr, FALSE);
+      GetLocalTimeFormat(hThis, iStyle, szLocal.AsByteStringC(), formatStr,
+                         FALSE);
       if (formatStr.IsEmpty()) {
         formatStr = "";
       }
-      FXJSE_Value_SetUTF8String(args.GetReturnValue(), formatStr);
+      FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                formatStr.AsByteStringC());
     } else {
       FXJSE_Value_SetNull(args.GetReturnValue());
     }
@@ -1366,12 +1374,14 @@ void CXFA_FM2JSContext::Num2Date(FXJSE_HOBJECT hThis,
       CFX_ByteString szIsoDateString;
       szIsoDateString.Format("%d%02d%02d", iYear + i, iMonth, iDay);
       CFX_ByteString szLocalDateString;
-      IsoDate2Local(hThis, szIsoDateString, formatString, localString,
+      IsoDate2Local(hThis, szIsoDateString.AsByteStringC(),
+                    formatString.AsByteStringC(), localString.AsByteStringC(),
                     szLocalDateString);
       if (szLocalDateString.IsEmpty()) {
         szLocalDateString = "";
       }
-      FXJSE_Value_SetUTF8String(args.GetReturnValue(), szLocalDateString);
+      FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                szLocalDateString.AsByteStringC());
     } else {
       FXJSE_Value_SetNull(args.GetReturnValue());
     }
@@ -1427,12 +1437,13 @@ void CXFA_FM2JSContext::Num2GMTime(FXJSE_HOBJECT hThis,
     }
     if (!bFlags) {
       CFX_ByteString szGMTTimeString;
-      Num2AllTime(hThis, iTime, formatString, localString, TRUE,
-                  szGMTTimeString);
+      Num2AllTime(hThis, iTime, formatString.AsByteStringC(),
+                  localString.AsByteStringC(), TRUE, szGMTTimeString);
       if (szGMTTimeString.IsEmpty()) {
         szGMTTimeString = "";
       }
-      FXJSE_Value_SetUTF8String(args.GetReturnValue(), szGMTTimeString);
+      FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                szGMTTimeString.AsByteStringC());
     } else {
       FXJSE_Value_SetNull(args.GetReturnValue());
     }
@@ -1488,12 +1499,13 @@ void CXFA_FM2JSContext::Num2Time(FXJSE_HOBJECT hThis,
     }
     if (!bFlags) {
       CFX_ByteString szLocalTimeString;
-      Num2AllTime(hThis, (int32_t)fTime, formatString, localString, FALSE,
-                  szLocalTimeString);
+      Num2AllTime(hThis, (int32_t)fTime, formatString.AsByteStringC(),
+                  localString.AsByteStringC(), FALSE, szLocalTimeString);
       if (szLocalTimeString.IsEmpty()) {
         szLocalTimeString = "";
       }
-      FXJSE_Value_SetUTF8String(args.GetReturnValue(), szLocalTimeString);
+      FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                szLocalTimeString.AsByteStringC());
     } else {
       FXJSE_Value_SetNull(args.GetReturnValue());
     }
@@ -1666,11 +1678,12 @@ void CXFA_FM2JSContext::TimeFmt(FXJSE_HOBJECT hThis,
     }
     if (!bFlags) {
       CFX_ByteString formatStr;
-      GetStandardTimeFormat(hThis, iStyle, szLocal, formatStr);
+      GetStandardTimeFormat(hThis, iStyle, szLocal.AsByteStringC(), formatStr);
       if (formatStr.IsEmpty()) {
         formatStr = "";
       }
-      FXJSE_Value_SetUTF8String(args.GetReturnValue(), formatStr);
+      FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                formatStr.AsByteStringC());
     } else {
       FXJSE_Value_SetNull(args.GetReturnValue());
     }
@@ -2486,9 +2499,11 @@ void CXFA_FM2JSContext::Num2AllTime(FXJSE_HOBJECT hThis,
   CFX_ByteString strIsoTime;
   strIsoTime.Format("%02d:%02d:%02d", iHour, iMin, iSec);
   if (bGM) {
-    iRet = GetGMTTime(hThis, strIsoTime, szFormat, szLocale, strTime);
+    iRet = GetGMTTime(hThis, strIsoTime.AsByteStringC(), szFormat, szLocale,
+                      strTime);
   } else {
-    iRet = IsoTime2Local(hThis, strIsoTime, szFormat, szLocale, strTime);
+    iRet = IsoTime2Local(hThis, strIsoTime.AsByteStringC(), szFormat, szLocale,
+                         strTime);
   }
   if (!iRet) {
     strTime = "";
@@ -3072,11 +3087,13 @@ void CXFA_FM2JSContext::Choose(FXJSE_HOBJECT hThis,
             } else {
               CFX_ByteString propStr;
               FXJSE_Value_ToUTF8String(propertyValue, propStr);
-              FXJSE_Value_GetObjectProp(jsobjectValue, propStr, newProperty);
+              FXJSE_Value_GetObjectProp(jsobjectValue, propStr.AsByteStringC(),
+                                        newProperty);
             }
             CFX_ByteString bsChoosed;
             HValueToUTF8String(newProperty, bsChoosed);
-            FXJSE_Value_SetUTF8String(args.GetReturnValue(), bsChoosed);
+            FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                      bsChoosed.AsByteStringC());
             FXJSE_Value_Release(newProperty);
             FXJSE_Value_Release(jsobjectValue);
             FXJSE_Value_Release(propertyValue);
@@ -3087,7 +3104,8 @@ void CXFA_FM2JSContext::Choose(FXJSE_HOBJECT hThis,
           if (iValueIndex == iIndex) {
             CFX_ByteString bsChoosed;
             HValueToUTF8String(argIndexValue, bsChoosed);
-            FXJSE_Value_SetUTF8String(args.GetReturnValue(), bsChoosed);
+            FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                      bsChoosed.AsByteStringC());
             bFound = TRUE;
           }
         }
@@ -3197,9 +3215,10 @@ void CXFA_FM2JSContext::Within(FXJSE_HOBJECT hThis,
         HValueToUTF8String(argOne, oneString);
         HValueToUTF8String(argLow, lowString);
         HValueToUTF8String(argHeight, heightString);
-        FXJSE_Value_SetInteger(args.GetReturnValue(),
-                               ((oneString.Compare(lowString) >= 0) &&
-                                (oneString.Compare(heightString) <= 0)));
+        FXJSE_Value_SetInteger(
+            args.GetReturnValue(),
+            ((oneString.Compare(lowString.AsByteStringC()) >= 0) &&
+             (oneString.Compare(heightString.AsByteStringC()) <= 0)));
       }
       FXJSE_Value_Release(argLow);
       FXJSE_Value_Release(argHeight);
@@ -3637,7 +3656,7 @@ void CXFA_FM2JSContext::At(FXJSE_HOBJECT hThis,
       } else {
         CFX_ByteString stringOne;
         HValueToUTF8String(argOne, stringOne);
-        FX_STRSIZE iPosition = stringOne.Find(stringTwo);
+        FX_STRSIZE iPosition = stringOne.Find(stringTwo.AsByteStringC());
         FXJSE_Value_SetInteger(args.GetReturnValue(), iPosition + 1);
       }
     }
@@ -3674,7 +3693,8 @@ void CXFA_FM2JSContext::Concat(FXJSE_HOBJECT hThis,
     if (bAllNull) {
       FXJSE_Value_SetNull(args.GetReturnValue());
     } else {
-      FXJSE_Value_SetUTF8String(args.GetReturnValue(), resultString);
+      FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                resultString.AsByteStringC());
     }
   } else {
     pContext->ThrowScriptErrorMessage(XFA_IDS_INCORRECT_NUMBER_OF_METHOD,
@@ -3695,7 +3715,7 @@ void CXFA_FM2JSContext::Decode(FXJSE_HOBJECT hThis,
       CFX_ByteString toDecodeString;
       HValueToUTF8String(argOne, toDecodeString);
       CFX_ByteTextBuf resultBuf;
-      DecodeURL(toDecodeString, resultBuf);
+      DecodeURL(toDecodeString.AsByteStringC(), resultBuf);
       FXJSE_Value_SetUTF8String(args.GetReturnValue(),
                                 resultBuf.GetByteString());
     }
@@ -3712,11 +3732,11 @@ void CXFA_FM2JSContext::Decode(FXJSE_HOBJECT hThis,
       HValueToUTF8String(argTwo, identifyString);
       CFX_ByteTextBuf resultBuf;
       if (identifyString.EqualNoCase("html")) {
-        DecodeHTML(toDecodeString, resultBuf);
+        DecodeHTML(toDecodeString.AsByteStringC(), resultBuf);
       } else if (identifyString.EqualNoCase("xml")) {
-        DecodeXML(toDecodeString, resultBuf);
+        DecodeXML(toDecodeString.AsByteStringC(), resultBuf);
       } else {
-        DecodeURL(toDecodeString, resultBuf);
+        DecodeURL(toDecodeString.AsByteStringC(), resultBuf);
       }
       FXJSE_Value_SetUTF8String(args.GetReturnValue(),
                                 resultBuf.GetByteString());
@@ -3781,7 +3801,8 @@ void CXFA_FM2JSContext::DecodeURL(const CFX_ByteStringC& szURLString,
   wsResultBuf.AppendChar(0);
   szResultString.Clear();
   szResultString << FX_UTF8Encode(wsResultBuf.GetBuffer(),
-                                  wsResultBuf.GetLength());
+                                  wsResultBuf.GetLength())
+                        .AsByteStringC();
 }
 void CXFA_FM2JSContext::DecodeHTML(const CFX_ByteStringC& szHTMLString,
                                    CFX_ByteTextBuf& szResultString) {
@@ -3855,7 +3876,8 @@ void CXFA_FM2JSContext::DecodeHTML(const CFX_ByteStringC& szHTMLString,
   wsResultBuf.AppendChar(0);
   szResultString.Clear();
   szResultString << FX_UTF8Encode(wsResultBuf.GetBuffer(),
-                                  wsResultBuf.GetLength());
+                                  wsResultBuf.GetLength())
+                        .AsByteStringC();
 }
 void CXFA_FM2JSContext::DecodeXML(const CFX_ByteStringC& szXMLString,
                                   CFX_ByteTextBuf& szResultString) {
@@ -3952,7 +3974,8 @@ void CXFA_FM2JSContext::DecodeXML(const CFX_ByteStringC& szXMLString,
   }
   wsXMLBuf.AppendChar(0);
   szResultString.Clear();
-  szResultString << FX_UTF8Encode(wsXMLBuf.GetBuffer(), wsXMLBuf.GetLength());
+  szResultString << FX_UTF8Encode(wsXMLBuf.GetBuffer(), wsXMLBuf.GetLength())
+                        .AsByteStringC();
 }
 void CXFA_FM2JSContext::Encode(FXJSE_HOBJECT hThis,
                                const CFX_ByteStringC& szFuncName,
@@ -3968,7 +3991,7 @@ void CXFA_FM2JSContext::Encode(FXJSE_HOBJECT hThis,
       CFX_ByteString toEncodeString;
       HValueToUTF8String(argOne, toEncodeString);
       CFX_ByteTextBuf resultBuf;
-      EncodeURL(toEncodeString, resultBuf);
+      EncodeURL(toEncodeString.AsByteStringC(), resultBuf);
       FXJSE_Value_SetUTF8String(args.GetReturnValue(),
                                 resultBuf.GetByteString());
     }
@@ -3985,11 +4008,11 @@ void CXFA_FM2JSContext::Encode(FXJSE_HOBJECT hThis,
       HValueToUTF8String(argTwo, identifyString);
       CFX_ByteTextBuf resultBuf;
       if (identifyString.EqualNoCase("html")) {
-        EncodeHTML(toEncodeString, resultBuf);
+        EncodeHTML(toEncodeString.AsByteStringC(), resultBuf);
       } else if (identifyString.EqualNoCase("xml")) {
-        EncodeXML(toEncodeString, resultBuf);
+        EncodeXML(toEncodeString.AsByteStringC(), resultBuf);
       } else {
-        EncodeURL(toEncodeString, resultBuf);
+        EncodeURL(toEncodeString.AsByteStringC(), resultBuf);
       }
       FXJSE_Value_SetUTF8String(args.GetReturnValue(),
                                 resultBuf.GetByteString());
@@ -4106,8 +4129,8 @@ void CXFA_FM2JSContext::EncodeURL(const CFX_ByteStringC& szURLString,
   }
   wsResultBuf.AppendChar(0);
   szResultBuf.Clear();
-  szResultBuf << FX_UTF8Encode(wsResultBuf.GetBuffer(),
-                               wsResultBuf.GetLength());
+  szResultBuf << FX_UTF8Encode(wsResultBuf.GetBuffer(), wsResultBuf.GetLength())
+                     .AsByteStringC();
 }
 void CXFA_FM2JSContext::EncodeHTML(const CFX_ByteStringC& szHTMLString,
                                    CFX_ByteTextBuf& szResultBuf) {
@@ -4160,8 +4183,8 @@ void CXFA_FM2JSContext::EncodeHTML(const CFX_ByteStringC& szHTMLString,
   }
   wsResultBuf.AppendChar(0);
   szResultBuf.Clear();
-  szResultBuf << FX_UTF8Encode(wsResultBuf.GetBuffer(),
-                               wsResultBuf.GetLength());
+  szResultBuf << FX_UTF8Encode(wsResultBuf.GetBuffer(), wsResultBuf.GetLength())
+                     .AsByteStringC();
 }
 void CXFA_FM2JSContext::EncodeXML(const CFX_ByteStringC& szXMLString,
                                   CFX_ByteTextBuf& szResultBuf) {
@@ -4242,8 +4265,8 @@ void CXFA_FM2JSContext::EncodeXML(const CFX_ByteStringC& szXMLString,
   }
   wsResultBuf.AppendChar(0);
   szResultBuf.Clear();
-  szResultBuf << FX_UTF8Encode(wsResultBuf.GetBuffer(),
-                               wsResultBuf.GetLength());
+  szResultBuf << FX_UTF8Encode(wsResultBuf.GetBuffer(), wsResultBuf.GetLength())
+                     .AsByteStringC();
 }
 FX_BOOL CXFA_FM2JSContext::HTMLSTR2Code(const CFX_WideStringC& pData,
                                         uint32_t& iCode) {
@@ -4392,7 +4415,8 @@ void CXFA_FM2JSContext::Format(FXJSE_HOBJECT hThis,
     CXFA_WidgetData widgetData(pThisNode);
     IFX_Locale* pLocale = widgetData.GetLocal();
     uint32_t patternType;
-    FX_BOOL bCompelte = XFA_PATTERN_STRING_Type(szPattern, patternType);
+    FX_BOOL bCompelte =
+        XFA_PATTERN_STRING_Type(szPattern.AsByteStringC(), patternType);
     CFX_WideString wsPattern =
         CFX_WideString::FromUTF8(szPattern, szPattern.GetLength());
     CFX_WideString wsValue =
@@ -4448,8 +4472,9 @@ void CXFA_FM2JSContext::Format(FXJSE_HOBJECT hThis,
     CFX_WideString wsRet;
     if (localeValue.FormatPatterns(wsRet, wsPattern, pLocale,
                                    XFA_VALUEPICTURE_Display)) {
-      FXJSE_Value_SetUTF8String(args.GetReturnValue(),
-                                FX_UTF8Encode(wsRet, wsRet.GetLength()));
+      FXJSE_Value_SetUTF8String(
+          args.GetReturnValue(),
+          FX_UTF8Encode(wsRet, wsRet.GetLength()).AsByteStringC());
     } else {
       FXJSE_Value_SetUTF8String(args.GetReturnValue(), "");
     }
@@ -4482,7 +4507,7 @@ void CXFA_FM2JSContext::Left(FXJSE_HOBJECT hThis,
         count = 0;
       }
       FXJSE_Value_SetUTF8String(args.GetReturnValue(),
-                                sourceString.Left(count));
+                                sourceString.Left(count).AsByteStringC());
     }
     FXJSE_Value_Release(argOne);
     FXJSE_Value_Release(argTwo);
@@ -4548,7 +4573,8 @@ void CXFA_FM2JSContext::Lower(FXJSE_HOBJECT hThis,
       lowStringBuf.AppendChar(0);
       FXJSE_Value_SetUTF8String(
           args.GetReturnValue(),
-          FX_UTF8Encode(lowStringBuf.GetBuffer(), lowStringBuf.GetLength()));
+          FX_UTF8Encode(lowStringBuf.GetBuffer(), lowStringBuf.GetLength())
+              .AsByteStringC());
       if (argc == 2) {
         FXJSE_Value_Release(localeValue);
       }
@@ -4574,7 +4600,8 @@ void CXFA_FM2JSContext::Ltrim(FXJSE_HOBJECT hThis,
       CFX_ByteString sourceString;
       HValueToUTF8String(argOne, sourceString);
       sourceString.TrimLeft();
-      FXJSE_Value_SetUTF8String(args.GetReturnValue(), sourceString);
+      FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                sourceString.AsByteStringC());
     }
     FXJSE_Value_Release(argOne);
   } else {
@@ -4605,7 +4632,7 @@ void CXFA_FM2JSContext::Parse(FXJSE_HOBJECT hThis,
       IFX_Locale* pLocale = widgetData.GetLocal();
       uint32_t patternType;
       FX_BOOL bCompletePattern =
-          XFA_PATTERN_STRING_Type(szPattern, patternType);
+          XFA_PATTERN_STRING_Type(szPattern.AsByteStringC(), patternType);
       CFX_WideString wsPattern =
           CFX_WideString::FromUTF8(szPattern, szPattern.GetLength());
       CFX_WideString wsValue =
@@ -4616,7 +4643,8 @@ void CXFA_FM2JSContext::Parse(FXJSE_HOBJECT hThis,
                                      (CXFA_LocaleMgr*)pMgr);
         if (localeValue.IsValid()) {
           szParsedValue = FX_UTF8Encode(localeValue.GetValue());
-          FXJSE_Value_SetUTF8String(args.GetReturnValue(), szParsedValue);
+          FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                    szParsedValue.AsByteStringC());
         } else {
           FXJSE_Value_SetUTF8String(args.GetReturnValue(), "");
         }
@@ -4635,7 +4663,8 @@ void CXFA_FM2JSContext::Parse(FXJSE_HOBJECT hThis,
                                          pLocale, (CXFA_LocaleMgr*)pMgr);
             if (localeValue.IsValid()) {
               szParsedValue = FX_UTF8Encode(localeValue.GetValue());
-              FXJSE_Value_SetUTF8String(args.GetReturnValue(), szParsedValue);
+              FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                        szParsedValue.AsByteStringC());
             } else {
               FXJSE_Value_SetUTF8String(args.GetReturnValue(), "");
             }
@@ -4647,7 +4676,8 @@ void CXFA_FM2JSContext::Parse(FXJSE_HOBJECT hThis,
                                          pLocale, (CXFA_LocaleMgr*)pMgr);
             if (localeValue.IsValid()) {
               szParsedValue = FX_UTF8Encode(localeValue.GetValue());
-              FXJSE_Value_SetUTF8String(args.GetReturnValue(), szParsedValue);
+              FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                        szParsedValue.AsByteStringC());
             } else {
               FXJSE_Value_SetUTF8String(args.GetReturnValue(), "");
             }
@@ -4659,7 +4689,8 @@ void CXFA_FM2JSContext::Parse(FXJSE_HOBJECT hThis,
                                          pLocale, (CXFA_LocaleMgr*)pMgr);
             if (localeValue.IsValid()) {
               szParsedValue = FX_UTF8Encode(localeValue.GetValue());
-              FXJSE_Value_SetUTF8String(args.GetReturnValue(), szParsedValue);
+              FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                        szParsedValue.AsByteStringC());
             } else {
               FXJSE_Value_SetUTF8String(args.GetReturnValue(), "");
             }
@@ -4671,7 +4702,8 @@ void CXFA_FM2JSContext::Parse(FXJSE_HOBJECT hThis,
                                          pLocale, (CXFA_LocaleMgr*)pMgr);
             if (localeValue.IsValid()) {
               szParsedValue = FX_UTF8Encode(localeValue.GetValue());
-              FXJSE_Value_SetUTF8String(args.GetReturnValue(), szParsedValue);
+              FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                        szParsedValue.AsByteStringC());
             } else {
               FXJSE_Value_SetUTF8String(args.GetReturnValue(), "");
             }
@@ -4704,7 +4736,8 @@ void CXFA_FM2JSContext::Parse(FXJSE_HOBJECT hThis,
                                            pLocale, (CXFA_LocaleMgr*)pMgr);
               if (localeValue.IsValid()) {
                 szParsedValue = FX_UTF8Encode(localeValue.GetValue());
-                FXJSE_Value_SetUTF8String(args.GetReturnValue(), szParsedValue);
+                FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                          szParsedValue.AsByteStringC());
               } else {
                 FXJSE_Value_SetUTF8String(args.GetReturnValue(), "");
               }
@@ -4761,7 +4794,7 @@ void CXFA_FM2JSContext::Replace(FXJSE_HOBJECT hThis,
           }
         }
         if (iFindIndex == iFindLen) {
-          resultString << threeString;
+          resultString << threeString.AsByteStringC();
           u += iFindLen - 1;
           iFindIndex = 0;
         } else {
@@ -4808,7 +4841,7 @@ void CXFA_FM2JSContext::Right(FXJSE_HOBJECT hThis,
         count = 0;
       }
       FXJSE_Value_SetUTF8String(args.GetReturnValue(),
-                                sourceString.Right(count));
+                                sourceString.Right(count).AsByteStringC());
     }
     FXJSE_Value_Release(argOne);
     FXJSE_Value_Release(argTwo);
@@ -4830,7 +4863,8 @@ void CXFA_FM2JSContext::Rtrim(FXJSE_HOBJECT hThis,
       CFX_ByteString sourceString;
       HValueToUTF8String(argOne, sourceString);
       sourceString.TrimRight();
-      FXJSE_Value_SetUTF8String(args.GetReturnValue(), sourceString);
+      FXJSE_Value_SetUTF8String(args.GetReturnValue(),
+                                sourceString.AsByteStringC());
     }
     FXJSE_Value_Release(argOne);
   } else {
@@ -5035,7 +5069,7 @@ void CXFA_FM2JSContext::Stuff(FXJSE_HOBJECT hThis,
       resultString.AppendChar(sourceString.GetAt(i));
       ++i;
     }
-    resultString << insertString;
+    resultString << insertString.AsByteStringC();
     i = iStart + iDelete;
     while (i < iLength) {
       resultString.AppendChar(sourceString.GetAt(i));
@@ -5089,8 +5123,9 @@ void CXFA_FM2JSContext::Substr(FXJSE_HOBJECT hThis,
           iCount = 0;
         }
         iStart -= 1;
-        FXJSE_Value_SetUTF8String(args.GetReturnValue(),
-                                  szSourceStr.Mid(iStart, iCount));
+        FXJSE_Value_SetUTF8String(
+            args.GetReturnValue(),
+            szSourceStr.Mid(iStart, iCount).AsByteStringC());
       }
     }
     FXJSE_Value_Release(stringValue);
@@ -5118,7 +5153,7 @@ void CXFA_FM2JSContext::Uuid(FXJSE_HOBJECT hThis,
     FX_GUID_CreateV4(&guid);
     CFX_ByteString bsUId;
     FX_GUID_ToString(&guid, bsUId, iNum);
-    FXJSE_Value_SetUTF8String(args.GetReturnValue(), bsUId);
+    FXJSE_Value_SetUTF8String(args.GetReturnValue(), bsUId.AsByteStringC());
     if (argc == 1) {
       FXJSE_Value_Release(argOne);
     }
@@ -5164,9 +5199,10 @@ void CXFA_FM2JSContext::Upper(FXJSE_HOBJECT hThis,
         ++i;
       }
       upperStringBuf.AppendChar(0);
-      FXJSE_Value_SetUTF8String(args.GetReturnValue(),
-                                FX_UTF8Encode(upperStringBuf.GetBuffer(),
-                                              upperStringBuf.GetLength()));
+      FXJSE_Value_SetUTF8String(
+          args.GetReturnValue(),
+          FX_UTF8Encode(upperStringBuf.GetBuffer(), upperStringBuf.GetLength())
+              .AsByteStringC());
       if (argc == 2) {
         FXJSE_Value_Release(localeValue);
       }
@@ -5219,7 +5255,7 @@ void CXFA_FM2JSContext::WordNum(FXJSE_HOBJECT hThis,
         CFX_ByteTextBuf resultBuf;
         CFX_ByteString numberString;
         numberString.Format("%.2f", fNumber);
-        WordUS(numberString, iIdentifier, resultBuf);
+        WordUS(numberString.AsByteStringC(), iIdentifier, resultBuf);
         FXJSE_Value_SetUTF8String(args.GetReturnValue(),
                                   resultBuf.GetByteString());
       }
@@ -5535,7 +5571,8 @@ void CXFA_FM2JSContext::Post(FXJSE_HOBJECT hThis,
     if (bFlags) {
       FXJSE_Value_SetUTF8String(
           args.GetReturnValue(),
-          FX_UTF8Encode(decodedResponse, decodedResponse.GetLength()));
+          FX_UTF8Encode(decodedResponse, decodedResponse.GetLength())
+              .AsByteStringC());
     } else {
       pContext->ThrowScriptErrorMessage(XFA_IDS_SERVER_DENY);
     }
@@ -5625,7 +5662,8 @@ void CXFA_FM2JSContext::assign_value_operator(FXJSE_HOBJECT hThis,
         FXJSE_Value_ToUTF8String(propertyValue, propertyStr);
         for (int32_t i = 2; i < iLeftLength; i++) {
           FXJSE_Value_GetObjectPropByIdx(lValue, i, jsObjectValue);
-          FXJSE_Value_SetObjectProp(jsObjectValue, propertyStr, rValue);
+          FXJSE_Value_SetObjectProp(jsObjectValue, propertyStr.AsByteStringC(),
+                                    rValue);
         }
       }
       FXJSE_Value_Release(jsObjectValue);
@@ -5808,8 +5846,9 @@ void CXFA_FM2JSContext::less_operator(FXJSE_HOBJECT hThis,
       CFX_ByteString secondOutput;
       FXJSE_Value_ToUTF8String(argFirst, firstOutput);
       FXJSE_Value_ToUTF8String(argSecond, secondOutput);
-      FXJSE_Value_SetInteger(args.GetReturnValue(),
-                             (firstOutput.Compare(secondOutput) == -1) ? 1 : 0);
+      FXJSE_Value_SetInteger(
+          args.GetReturnValue(),
+          firstOutput.Compare(secondOutput.AsByteStringC()) == -1);
     } else {
       FX_DOUBLE first = HValueToDouble(hThis, argFirst);
       FX_DOUBLE second = HValueToDouble(hThis, argSecond);
@@ -5840,8 +5879,9 @@ void CXFA_FM2JSContext::lessequal_operator(FXJSE_HOBJECT hThis,
       CFX_ByteString secondOutput;
       FXJSE_Value_ToUTF8String(argFirst, firstOutput);
       FXJSE_Value_ToUTF8String(argSecond, secondOutput);
-      FXJSE_Value_SetInteger(args.GetReturnValue(),
-                             (firstOutput.Compare(secondOutput) != 1) ? 1 : 0);
+      FXJSE_Value_SetInteger(
+          args.GetReturnValue(),
+          firstOutput.Compare(secondOutput.AsByteStringC()) != 1);
     } else {
       FX_DOUBLE first = HValueToDouble(hThis, argFirst);
       FX_DOUBLE second = HValueToDouble(hThis, argSecond);
@@ -5869,8 +5909,9 @@ void CXFA_FM2JSContext::greater_operator(FXJSE_HOBJECT hThis,
       CFX_ByteString secondOutput;
       FXJSE_Value_ToUTF8String(argFirst, firstOutput);
       FXJSE_Value_ToUTF8String(argSecond, secondOutput);
-      FXJSE_Value_SetInteger(args.GetReturnValue(),
-                             (firstOutput.Compare(secondOutput) == 1) ? 1 : 0);
+      FXJSE_Value_SetInteger(
+          args.GetReturnValue(),
+          firstOutput.Compare(secondOutput.AsByteStringC()) == 1);
     } else {
       FX_DOUBLE first = HValueToDouble(hThis, argFirst);
       FX_DOUBLE second = HValueToDouble(hThis, argSecond);
@@ -5901,8 +5942,9 @@ void CXFA_FM2JSContext::greaterequal_operator(FXJSE_HOBJECT hThis,
       CFX_ByteString secondOutput;
       FXJSE_Value_ToUTF8String(argFirst, firstOutput);
       FXJSE_Value_ToUTF8String(argSecond, secondOutput);
-      FXJSE_Value_SetInteger(args.GetReturnValue(),
-                             (firstOutput.Compare(secondOutput) != -1) ? 1 : 0);
+      FXJSE_Value_SetInteger(
+          args.GetReturnValue(),
+          firstOutput.Compare(secondOutput.AsByteStringC()) != -1);
     } else {
       FX_DOUBLE first = HValueToDouble(hThis, argFirst);
       FX_DOUBLE second = HValueToDouble(hThis, argSecond);
@@ -6082,7 +6124,8 @@ void CXFA_FM2JSContext::dot_accessor(FXJSE_HOBJECT hThis,
       iIndexValue = HValueToInteger(hThis, argIndex);
     }
     CFX_ByteString szSomExp;
-    GenerateSomExpression(szName, iIndexFlags, iIndexValue, bIsStar, szSomExp);
+    GenerateSomExpression(szName.AsByteStringC(), iIndexFlags, iIndexValue,
+                          bIsStar, szSomExp);
     if (FXJSE_Value_IsArray(argAccessor)) {
       FXJSE_HVALUE hLengthValue = FXJSE_Value_Create(hruntime);
       FXJSE_Value_GetObjectProp(argAccessor, "length", hLengthValue);
@@ -6099,8 +6142,9 @@ void CXFA_FM2JSContext::dot_accessor(FXJSE_HOBJECT hThis,
       for (int32_t i = 2; i < iLength; i++) {
         FXJSE_Value_GetObjectPropByIdx(argAccessor, i, hJSObjValue);
         XFA_RESOLVENODE_RS resoveNodeRS;
-        int32_t iRet = ResolveObjects(hThis, hJSObjValue, szSomExp,
-                                      resoveNodeRS, TRUE, szName.IsEmpty());
+        int32_t iRet =
+            ResolveObjects(hThis, hJSObjValue, szSomExp.AsByteStringC(),
+                           resoveNodeRS, TRUE, szName.IsEmpty());
         if (iRet > 0) {
           ParseResolveResult(hThis, resoveNodeRS, hJSObjValue,
                              hResolveValues[i - 2], iSizes[i - 2], bAttribute);
@@ -6115,7 +6159,7 @@ void CXFA_FM2JSContext::dot_accessor(FXJSE_HOBJECT hThis,
         }
         FXJSE_Value_SetInteger(rgValues[0], 1);
         if (bAttribute) {
-          FXJSE_Value_SetUTF8String(rgValues[1], szName);
+          FXJSE_Value_SetUTF8String(rgValues[1], szName.AsByteStringC());
         } else {
           FXJSE_Value_SetNull(rgValues[1]);
         }
@@ -6155,15 +6199,15 @@ void CXFA_FM2JSContext::dot_accessor(FXJSE_HOBJECT hThis,
       int32_t iRet = 0;
       if (FXJSE_Value_IsObject(argAccessor) ||
           (FXJSE_Value_IsNull(argAccessor) && bsAccessorName.IsEmpty())) {
-        iRet = ResolveObjects(hThis, argAccessor, szSomExp, resoveNodeRS, TRUE,
-                              szName.IsEmpty());
+        iRet = ResolveObjects(hThis, argAccessor, szSomExp.AsByteStringC(),
+                              resoveNodeRS, TRUE, szName.IsEmpty());
       } else if (!FXJSE_Value_IsObject(argAccessor) &&
                  !bsAccessorName.IsEmpty()) {
         FX_BOOL bGetObject =
-            GetObjectByName(hThis, argAccessor, bsAccessorName);
+            GetObjectByName(hThis, argAccessor, bsAccessorName.AsByteStringC());
         if (bGetObject) {
-          iRet = ResolveObjects(hThis, argAccessor, szSomExp, resoveNodeRS,
-                                TRUE, szName.IsEmpty());
+          iRet = ResolveObjects(hThis, argAccessor, szSomExp.AsByteStringC(),
+                                resoveNodeRS, TRUE, szName.IsEmpty());
         }
       }
       if (iRet > 0) {
@@ -6178,7 +6222,7 @@ void CXFA_FM2JSContext::dot_accessor(FXJSE_HOBJECT hThis,
         }
         FXJSE_Value_SetInteger(rgValues[0], 1);
         if (bAttribute) {
-          FXJSE_Value_SetUTF8String(rgValues[1], szName);
+          FXJSE_Value_SetUTF8String(rgValues[1], szName.AsByteStringC());
         } else {
           FXJSE_Value_SetNull(rgValues[1]);
         }
@@ -6233,7 +6277,8 @@ void CXFA_FM2JSContext::dotdot_accessor(FXJSE_HOBJECT hThis,
       iIndexValue = HValueToInteger(hThis, argIndex);
     }
     CFX_ByteString szSomExp;
-    GenerateSomExpression(szName, iIndexFlags, iIndexValue, bIsStar, szSomExp);
+    GenerateSomExpression(szName.AsByteStringC(), iIndexFlags, iIndexValue,
+                          bIsStar, szSomExp);
     if (FXJSE_Value_IsArray(argAccessor)) {
       FXJSE_HVALUE hLengthValue = FXJSE_Value_Create(hruntime);
       FXJSE_Value_GetObjectProp(argAccessor, "length", hLengthValue);
@@ -6246,8 +6291,8 @@ void CXFA_FM2JSContext::dotdot_accessor(FXJSE_HOBJECT hThis,
       for (int32_t i = 2; i < iLength; i++) {
         FXJSE_Value_GetObjectPropByIdx(argAccessor, i, hJSObjValue);
         XFA_RESOLVENODE_RS resoveNodeRS;
-        int32_t iRet =
-            ResolveObjects(hThis, hJSObjValue, szSomExp, resoveNodeRS, FALSE);
+        int32_t iRet = ResolveObjects(
+            hThis, hJSObjValue, szSomExp.AsByteStringC(), resoveNodeRS, FALSE);
         if (iRet > 0) {
           ParseResolveResult(hThis, resoveNodeRS, hJSObjValue,
                              hResolveValues[i - 2], iSizes[i - 2], bAttribute);
@@ -6262,7 +6307,7 @@ void CXFA_FM2JSContext::dotdot_accessor(FXJSE_HOBJECT hThis,
         }
         FXJSE_Value_SetInteger(rgValues[0], 1);
         if (bAttribute) {
-          FXJSE_Value_SetUTF8String(rgValues[1], szName);
+          FXJSE_Value_SetUTF8String(rgValues[1], szName.AsByteStringC());
         } else {
           FXJSE_Value_SetNull(rgValues[1]);
         }
@@ -6301,15 +6346,15 @@ void CXFA_FM2JSContext::dotdot_accessor(FXJSE_HOBJECT hThis,
       int32_t iRet = 0;
       if (FXJSE_Value_IsObject(argAccessor) ||
           (FXJSE_Value_IsNull(argAccessor) && bsAccessorName.IsEmpty())) {
-        iRet =
-            ResolveObjects(hThis, argAccessor, szSomExp, resoveNodeRS, FALSE);
+        iRet = ResolveObjects(hThis, argAccessor, szSomExp.AsByteStringC(),
+                              resoveNodeRS, FALSE);
       } else if (!FXJSE_Value_IsObject(argAccessor) &&
                  !bsAccessorName.IsEmpty()) {
         FX_BOOL bGetObject =
-            GetObjectByName(hThis, argAccessor, bsAccessorName);
+            GetObjectByName(hThis, argAccessor, bsAccessorName.AsByteStringC());
         if (bGetObject) {
-          iRet =
-              ResolveObjects(hThis, argAccessor, szSomExp, resoveNodeRS, FALSE);
+          iRet = ResolveObjects(hThis, argAccessor, szSomExp.AsByteStringC(),
+                                resoveNodeRS, FALSE);
         }
       }
       if (iRet > 0) {
@@ -6324,7 +6369,7 @@ void CXFA_FM2JSContext::dotdot_accessor(FXJSE_HOBJECT hThis,
         }
         FXJSE_Value_SetInteger(rgValues[0], 1);
         if (bAttribute) {
-          FXJSE_Value_SetUTF8String(rgValues[1], szName);
+          FXJSE_Value_SetUTF8String(rgValues[1], szName.AsByteStringC());
         } else {
           FXJSE_Value_SetNull(rgValues[1]);
         }
@@ -6380,7 +6425,7 @@ void CXFA_FM2JSContext::eval_translation(FXJSE_HOBJECT hThis,
         CFX_WideString javaScript = wsJavaScriptBuf.GetWideString();
         FXJSE_Value_SetUTF8String(
             args.GetReturnValue(),
-            FX_UTF8Encode(javaScript, javaScript.GetLength()));
+            FX_UTF8Encode(javaScript, javaScript.GetLength()).AsByteStringC());
       } else {
         pContext->ThrowScriptErrorMessage(XFA_IDS_COMPILER_ERROR);
       }
@@ -6435,7 +6480,7 @@ void CXFA_FM2JSContext::get_fm_value(FXJSE_HOBJECT hThis,
       } else {
         CFX_ByteString propertyStr;
         FXJSE_Value_ToUTF8String(propertyValue, propertyStr);
-        FXJSE_Value_GetObjectProp(jsobjectValue, propertyStr,
+        FXJSE_Value_GetObjectProp(jsobjectValue, propertyStr.AsByteStringC(),
                                   args.GetReturnValue());
       }
       FXJSE_Value_Release(propertyValue);
@@ -6604,7 +6649,8 @@ FXJSE_HVALUE CXFA_FM2JSContext::GetSimpleHValue(FXJSE_HOBJECT hThis,
       } else {
         CFX_ByteString propertyStr;
         FXJSE_Value_ToUTF8String(propertyValue, propertyStr);
-        FXJSE_Value_GetObjectProp(jsobjectValue, propertyStr, simpleValue);
+        FXJSE_Value_GetObjectProp(jsobjectValue, propertyStr.AsByteStringC(),
+                                  simpleValue);
       }
       FXJSE_Value_Release(propertyValue);
       FXJSE_Value_Release(jsobjectValue);
@@ -6647,7 +6693,8 @@ FX_BOOL CXFA_FM2JSContext::HValueIsNull(FXJSE_HOBJECT hThis, FXJSE_HVALUE arg) {
         CFX_ByteString propertyStr;
         FXJSE_Value_ToUTF8String(propertyValue, propertyStr);
         FXJSE_HVALUE newPropertyValue = FXJSE_Value_Create(hruntime);
-        FXJSE_Value_GetObjectProp(jsObjectValue, propertyStr, newPropertyValue);
+        FXJSE_Value_GetObjectProp(jsObjectValue, propertyStr.AsByteStringC(),
+                                  newPropertyValue);
         if (FXJSE_Value_IsNull(newPropertyValue)) {
           isNull = TRUE;
         }
@@ -6753,7 +6800,8 @@ void CXFA_FM2JSContext::unfoldArgs(FXJSE_HOBJECT hThis,
           FXJSE_Value_ToUTF8String(propertyValue, propertyString);
           for (int32_t j = 2; j < iLength; j++) {
             FXJSE_Value_GetObjectPropByIdx(argsValue[i], j, jsObjectValue);
-            FXJSE_Value_GetObjectProp(jsObjectValue, propertyString,
+            FXJSE_Value_GetObjectProp(jsObjectValue,
+                                      propertyString.AsByteStringC(),
                                       resultValues[index]);
             index++;
           }
@@ -6963,7 +7011,8 @@ int32_t CXFA_FM2JSContext::HValueToInteger(FXJSE_HOBJECT hThis,
     } else {
       CFX_ByteString propertyStr;
       FXJSE_Value_ToUTF8String(propertyValue, propertyStr);
-      FXJSE_Value_GetObjectProp(jsobjectValue, propertyStr, newProperty);
+      FXJSE_Value_GetObjectProp(jsobjectValue, propertyStr.AsByteStringC(),
+                                newProperty);
     }
     iValue = HValueToInteger(hThis, newProperty);
     FXJSE_Value_Release(newProperty);
@@ -7006,7 +7055,8 @@ FX_FLOAT CXFA_FM2JSContext::HValueToFloat(FXJSE_HOBJECT hThis,
     } else {
       CFX_ByteString propertyStr;
       FXJSE_Value_ToUTF8String(propertyValue, propertyStr);
-      FXJSE_Value_GetObjectProp(jsobjectValue, propertyStr, newProperty);
+      FXJSE_Value_GetObjectProp(jsobjectValue, propertyStr.AsByteStringC(),
+                                newProperty);
     }
     fRet = HValueToFloat(hThis, newProperty);
     FXJSE_Value_Release(newProperty);
@@ -7020,7 +7070,7 @@ FX_FLOAT CXFA_FM2JSContext::HValueToFloat(FXJSE_HOBJECT hThis,
   } else if (FXJSE_Value_IsUTF8String(arg)) {
     CFX_ByteString bsOutput;
     FXJSE_Value_ToUTF8String(arg, bsOutput);
-    fRet = (FX_FLOAT)StringToDouble(bsOutput);
+    fRet = (FX_FLOAT)StringToDouble(bsOutput.AsByteStringC());
   } else if (FXJSE_Value_IsUndefined(arg)) {
     fRet = 0;
   } else {
@@ -7045,7 +7095,8 @@ FX_DOUBLE CXFA_FM2JSContext::HValueToDouble(FXJSE_HOBJECT hThis,
     } else {
       CFX_ByteString propertyStr;
       FXJSE_Value_ToUTF8String(propertyValue, propertyStr);
-      FXJSE_Value_GetObjectProp(jsobjectValue, propertyStr, newProperty);
+      FXJSE_Value_GetObjectProp(jsobjectValue, propertyStr.AsByteStringC(),
+                                newProperty);
     }
     dRet = HValueToDouble(hThis, newProperty);
     FXJSE_Value_Release(newProperty);
@@ -7059,7 +7110,7 @@ FX_DOUBLE CXFA_FM2JSContext::HValueToDouble(FXJSE_HOBJECT hThis,
   } else if (FXJSE_Value_IsUTF8String(arg)) {
     CFX_ByteString bsOutput;
     FXJSE_Value_ToUTF8String(arg, bsOutput);
-    dRet = StringToDouble(bsOutput);
+    dRet = StringToDouble(bsOutput.AsByteStringC());
   } else if (FXJSE_Value_IsUndefined(arg)) {
     dRet = 0;
   } else {
@@ -7219,5 +7270,6 @@ void CXFA_FM2JSContext::ThrowScriptErrorMessage(int32_t iStringID, ...) {
   va_start(arg_ptr, iStringID);
   wsMessage.FormatV((const FX_WCHAR*)wsFormat, arg_ptr);
   va_end(arg_ptr);
-  FXJSE_ThrowMessage("", FX_UTF8Encode(wsMessage, wsMessage.GetLength()));
+  FXJSE_ThrowMessage(
+      "", FX_UTF8Encode(wsMessage, wsMessage.GetLength()).AsByteStringC());
 }
diff --git a/xfa/fxfa/parser/xfa_locale.cpp b/xfa/fxfa/parser/xfa_locale.cpp
index 35d8c36fa2..141e295be9 100644
--- a/xfa/fxfa/parser/xfa_locale.cpp
+++ b/xfa/fxfa/parser/xfa_locale.cpp
@@ -72,7 +72,8 @@ void CXFA_XMLLocale::GetNumbericSymbol(FX_LOCALENUMSYMBOL eType,
     default:
       return;
   }
-  CXML_Element* pElement = m_pLocaleData->GetElement("", bsSymbols);
+  CXML_Element* pElement =
+      m_pLocaleData->GetElement("", bsSymbols.AsByteStringC());
   if (!pElement) {
     return;
   }
@@ -86,7 +87,7 @@ void CXFA_XMLLocale::GetDateTimeSymbols(CFX_WideString& wsDtSymbol) const {
   }
   CFX_ByteString bsSpace;
   CXML_Element* pNumberSymbols =
-      m_pLocaleData->GetElement(bsSpace, "dateTimeSymbols");
+      m_pLocaleData->GetElement(bsSpace.AsByteStringC(), "dateTimeSymbols");
   if (!pNumberSymbols) {
     return;
   }
@@ -120,10 +121,12 @@ CFX_WideString CXFA_XMLLocale::GetCalendarSymbol(const CFX_ByteStringC& symbol,
   if (m_pLocaleData) {
     CXML_Element* pChild = m_pLocaleData->GetElement("", "calendarSymbols");
     if (pChild) {
-      CXML_Element* pSymbolNames = pChild->GetElement("", pstrSymbolNames);
+      CXML_Element* pSymbolNames =
+          pChild->GetElement("", pstrSymbolNames.AsByteStringC());
       if (pSymbolNames) {
         if (pSymbolNames->GetAttrInteger("abbr") != bAbbr) {
-          pSymbolNames = pChild->GetElement("", pstrSymbolNames, 1);
+          pSymbolNames =
+              pChild->GetElement("", pstrSymbolNames.AsByteStringC(), 1);
         }
         if (pSymbolNames && pSymbolNames->GetAttrInteger("abbr") == bAbbr) {
           CXML_Element* pSymbolName =
diff --git a/xfa/fxfa/parser/xfa_object_imp.cpp b/xfa/fxfa/parser/xfa_object_imp.cpp
index 15f21c8a23..d245e33e29 100644
--- a/xfa/fxfa/parser/xfa_object_imp.cpp
+++ b/xfa/fxfa/parser/xfa_object_imp.cpp
@@ -56,7 +56,8 @@ void CXFA_Object::Script_ObjectClass_ClassName(FXJSE_HVALUE hValue,
     CFX_WideStringC className;
     GetClassName(className);
     FXJSE_Value_SetUTF8String(
-        hValue, FX_UTF8Encode(className.GetPtr(), className.GetLength()));
+        hValue, FX_UTF8Encode(className.GetPtr(), className.GetLength())
+                    .AsByteStringC());
   } else {
     ThrowScriptErrorMessage(XFA_IDS_INVAlID_PROP_SET);
   }
@@ -71,7 +72,8 @@ void CXFA_Object::ThrowScriptErrorMessage(int32_t iStringID, ...) {
   va_start(arg_ptr, iStringID);
   wsMessage.FormatV((const FX_WCHAR*)wsFormat, arg_ptr);
   va_end(arg_ptr);
-  FXJSE_ThrowMessage("", FX_UTF8Encode(wsMessage, wsMessage.GetLength()));
+  FXJSE_ThrowMessage(
+      "", FX_UTF8Encode(wsMessage, wsMessage.GetLength()).AsByteStringC());
 }
 
 static void XFA_DeleteWideString(void* pData) {
@@ -752,7 +754,8 @@ void CXFA_Node::Script_TreeClass_Nodes(FXJSE_HVALUE hValue,
     FXSYS_assert(pAppProvider);
     CFX_WideString wsMessage;
     pAppProvider->LoadString(XFA_IDS_Unable_TO_SET, wsMessage);
-    FXJSE_ThrowMessage("", FX_UTF8Encode(wsMessage, wsMessage.GetLength()));
+    FXJSE_ThrowMessage(
+        "", FX_UTF8Encode(wsMessage, wsMessage.GetLength()).AsByteStringC());
   } else {
     CXFA_AttachNodeList* pNodeList = new CXFA_AttachNodeList(m_pDocument, this);
     FXJSE_Value_SetObject(hValue, (CXFA_Object*)pNodeList,
@@ -813,7 +816,8 @@ void CXFA_Node::Script_TreeClass_SomExpression(FXJSE_HVALUE hValue,
   } else {
     CFX_WideString wsSOMExpression;
     GetSOMExpression(wsSOMExpression);
-    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsSOMExpression));
+    FXJSE_Value_SetUTF8String(hValue,
+                              FX_UTF8Encode(wsSOMExpression).AsByteStringC());
   }
 }
 void CXFA_Node::Script_NodeClass_ApplyXSL(CFXJSE_Arguments* pArguments) {
@@ -877,7 +881,7 @@ void CXFA_Node::Script_NodeClass_GetAttribute(CFXJSE_Arguments* pArguments) {
   GetAttribute(wsExpression, wsValue);
   FXJSE_HVALUE hValue = pArguments->GetReturnValue();
   if (hValue) {
-    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsValue));
+    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsValue).AsByteStringC());
   }
 }
 void CXFA_Node::Script_NodeClass_GetElement(CFXJSE_Arguments* pArguments) {
@@ -1180,7 +1184,8 @@ void CXFA_Node::Script_NodeClass_Ns(FXJSE_HVALUE hValue,
   } else {
     CFX_WideString wsNameSpace;
     TryNamespace(wsNameSpace);
-    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsNameSpace));
+    FXJSE_Value_SetUTF8String(hValue,
+                              FX_UTF8Encode(wsNameSpace).AsByteStringC());
   }
 }
 void CXFA_Node::Script_NodeClass_Model(FXJSE_HVALUE hValue,
@@ -1534,8 +1539,8 @@ void CXFA_Node::Script_Attribute_String(FXJSE_HVALUE hValue,
   } else {
     CFX_WideString wsValue;
     GetAttribute(eAttribute, wsValue);
-    FXJSE_Value_SetUTF8String(hValue,
-                              FX_UTF8Encode(wsValue, wsValue.GetLength()));
+    FXJSE_Value_SetUTF8String(
+        hValue, FX_UTF8Encode(wsValue, wsValue.GetLength()).AsByteStringC());
   }
 }
 void CXFA_Node::Script_Attribute_StringRead(FXJSE_HVALUE hValue,
@@ -1544,8 +1549,8 @@ void CXFA_Node::Script_Attribute_StringRead(FXJSE_HVALUE hValue,
   if (!bSetting) {
     CFX_WideString wsValue;
     GetAttribute(eAttribute, wsValue);
-    FXJSE_Value_SetUTF8String(hValue,
-                              FX_UTF8Encode(wsValue, wsValue.GetLength()));
+    FXJSE_Value_SetUTF8String(
+        hValue, FX_UTF8Encode(wsValue, wsValue.GetLength()).AsByteStringC());
   } else {
     ThrowScriptErrorMessage(XFA_IDS_INVAlID_PROP_SET);
   }
@@ -1628,7 +1633,7 @@ void CXFA_Node::Script_Som_Message(FXJSE_HVALUE hValue,
       default:
         break;
     }
-    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsMessage));
+    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsMessage).AsByteStringC());
   }
 }
 void CXFA_Node::Script_Som_ValidationMessage(FXJSE_HVALUE hValue,
@@ -1710,8 +1715,8 @@ void CXFA_Node::Script_Som_DefaultValue(FXJSE_HVALUE hValue,
       CFX_Decimal decimal(content);
       FXJSE_Value_SetFloat(hValue, (FX_FLOAT)(double)decimal);
     } else {
-      FXJSE_Value_SetUTF8String(hValue,
-                                FX_UTF8Encode(content, content.GetLength()));
+      FXJSE_Value_SetUTF8String(
+          hValue, FX_UTF8Encode(content, content.GetLength()).AsByteStringC());
     }
   }
 }
@@ -1726,8 +1731,8 @@ void CXFA_Node::Script_Som_DefaultValue_Read(FXJSE_HVALUE hValue,
   if (content.IsEmpty()) {
     FXJSE_Value_SetNull(hValue);
   } else {
-    FXJSE_Value_SetUTF8String(hValue,
-                              FX_UTF8Encode(content, content.GetLength()));
+    FXJSE_Value_SetUTF8String(
+        hValue, FX_UTF8Encode(content, content.GetLength()).AsByteStringC());
   }
 }
 void CXFA_Node::Script_Boolean_Value(FXJSE_HVALUE hValue,
@@ -1867,7 +1872,7 @@ void CXFA_Node::Script_Som_BorderColor(FXJSE_HVALUE hValue,
     int32_t a, r, g, b;
     ArgbDecode(color, a, r, g, b);
     strColor.Format(L"%d,%d,%d", r, g, b);
-    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(strColor));
+    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(strColor).AsByteStringC());
   }
 }
 void CXFA_Node::Script_Som_BorderWidth(FXJSE_HVALUE hValue,
@@ -1893,7 +1898,8 @@ void CXFA_Node::Script_Som_BorderWidth(FXJSE_HVALUE hValue,
     CXFA_Edge edge = border.GetEdge(0);
     CXFA_Measurement thickness = edge.GetMSThickness();
     thickness.ToString(wsThickness);
-    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsThickness));
+    FXJSE_Value_SetUTF8String(hValue,
+                              FX_UTF8Encode(wsThickness).AsByteStringC());
   }
 }
 void CXFA_Node::Script_Som_FillColor(FXJSE_HVALUE hValue,
@@ -1923,7 +1929,7 @@ void CXFA_Node::Script_Som_FillColor(FXJSE_HVALUE hValue,
     int32_t a, r, g, b;
     ArgbDecode(color, a, r, g, b);
     wsColor.Format(L"%d,%d,%d", r, g, b);
-    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsColor));
+    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsColor).AsByteStringC());
   }
 }
 void CXFA_Node::Script_Som_DataNode(FXJSE_HVALUE hValue,
@@ -1965,8 +1971,8 @@ void CXFA_Node::Script_Draw_DefaultValue(FXJSE_HVALUE hValue,
     if (content.IsEmpty()) {
       FXJSE_Value_SetNull(hValue);
     } else {
-      FXJSE_Value_SetUTF8String(hValue,
-                                FX_UTF8Encode(content, content.GetLength()));
+      FXJSE_Value_SetUTF8String(
+          hValue, FX_UTF8Encode(content, content.GetLength()).AsByteStringC());
     }
   }
 }
@@ -2018,7 +2024,8 @@ void CXFA_Node::Script_Field_DefaultValue(FXJSE_HVALUE hValue,
         if (eUI == XFA_ELEMENT_NumericEdit &&
             (pNode->GetInteger(XFA_ATTRIBUTE_FracDigits) == -1)) {
           FXJSE_Value_SetUTF8String(
-              hValue, FX_UTF8Encode(content, content.GetLength()));
+              hValue,
+              FX_UTF8Encode(content, content.GetLength()).AsByteStringC());
         } else {
           CFX_Decimal decimal(content);
           FXJSE_Value_SetFloat(hValue, (FX_FLOAT)(double)decimal);
@@ -2031,8 +2038,9 @@ void CXFA_Node::Script_Field_DefaultValue(FXJSE_HVALUE hValue,
         CFX_Decimal decimal(content);
         FXJSE_Value_SetFloat(hValue, (FX_FLOAT)(double)decimal);
       } else {
-        FXJSE_Value_SetUTF8String(hValue,
-                                  FX_UTF8Encode(content, content.GetLength()));
+        FXJSE_Value_SetUTF8String(
+            hValue,
+            FX_UTF8Encode(content, content.GetLength()).AsByteStringC());
       }
     }
   }
@@ -2052,7 +2060,7 @@ void CXFA_Node::Script_Field_EditValue(FXJSE_HVALUE hValue,
     pWidgetData->SetValue(wsValue, XFA_VALUEPICTURE_Edit);
   } else {
     pWidgetData->GetValue(wsValue, XFA_VALUEPICTURE_Edit);
-    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsValue));
+    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsValue).AsByteStringC());
   }
 }
 void CXFA_Node::Script_Som_FontColor(FXJSE_HVALUE hValue,
@@ -2081,7 +2089,7 @@ void CXFA_Node::Script_Som_FontColor(FXJSE_HVALUE hValue,
     int32_t a, r, g, b;
     ArgbDecode(color, a, r, g, b);
     wsColor.Format(L"%d,%d,%d", r, g, b);
-    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsColor));
+    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsColor).AsByteStringC());
   }
 }
 void CXFA_Node::Script_Field_FormatMessage(FXJSE_HVALUE hValue,
@@ -2104,7 +2112,7 @@ void CXFA_Node::Script_Field_FormattedValue(FXJSE_HVALUE hValue,
     pWidgetData->SetValue(wsValue, XFA_VALUEPICTURE_Display);
   } else {
     pWidgetData->GetValue(wsValue, XFA_VALUEPICTURE_Display);
-    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsValue));
+    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsValue).AsByteStringC());
   }
 }
 void CXFA_Node::Script_Som_Mandatory(FXJSE_HVALUE hValue,
@@ -2128,7 +2136,7 @@ void CXFA_Node::Script_Som_Mandatory(FXJSE_HVALUE hValue,
     if (pInfo) {
       wsValue = pInfo->pName;
     }
-    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsValue));
+    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsValue).AsByteStringC());
   }
 }
 void CXFA_Node::Script_Som_MandatoryMessage(FXJSE_HVALUE hValue,
@@ -2234,8 +2242,9 @@ void CXFA_Node::Script_Field_GetSaveItem(CFXJSE_Arguments* pArguments) {
   CFX_WideString wsValue;
   FX_BOOL bHasItem = pWidgetData->GetChoiceListItem(wsValue, iIndex, TRUE);
   if (bHasItem) {
-    FXJSE_Value_SetUTF8String(pArguments->GetReturnValue(),
-                              FX_UTF8Encode(wsValue, wsValue.GetLength()));
+    FXJSE_Value_SetUTF8String(
+        pArguments->GetReturnValue(),
+        FX_UTF8Encode(wsValue, wsValue.GetLength()).AsByteStringC());
   } else {
     FXJSE_Value_SetNull(pArguments->GetReturnValue());
   }
@@ -2257,7 +2266,8 @@ void CXFA_Node::Script_Field_BoundItem(CFXJSE_Arguments* pArguments) {
   pWidgetData->GetItemValue(wsValue, wsBoundValue);
   FXJSE_HVALUE hValue = pArguments->GetReturnValue();
   if (hValue) {
-    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsBoundValue));
+    FXJSE_Value_SetUTF8String(hValue,
+                              FX_UTF8Encode(wsBoundValue).AsByteStringC());
   }
 }
 void CXFA_Node::Script_Field_GetItemState(CFXJSE_Arguments* pArguments) {
@@ -2312,8 +2322,9 @@ void CXFA_Node::Script_Field_GetDisplayItem(CFXJSE_Arguments* pArguments) {
   CFX_WideString wsValue;
   FX_BOOL bHasItem = pWidgetData->GetChoiceListItem(wsValue, iIndex, FALSE);
   if (bHasItem) {
-    FXJSE_Value_SetUTF8String(pArguments->GetReturnValue(),
-                              FX_UTF8Encode(wsValue, wsValue.GetLength()));
+    FXJSE_Value_SetUTF8String(
+        pArguments->GetReturnValue(),
+        FX_UTF8Encode(wsValue, wsValue.GetLength()).AsByteStringC());
   } else {
     FXJSE_Value_SetNull(pArguments->GetReturnValue());
   }
@@ -2403,7 +2414,7 @@ void CXFA_Node::Script_ExclGroup_DefaultAndRawValue(FXJSE_HVALUE hValue,
     if (wsValue.IsEmpty() && curVersion >= XFA_VERSION_300) {
       FXJSE_Value_SetNull(hValue);
     } else {
-      FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsValue));
+      FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsValue).AsByteStringC());
     }
   }
 }
@@ -2602,7 +2613,8 @@ void CXFA_Node::Script_Subform_Locale(FXJSE_HVALUE hValue,
     CFX_WideString wsLocaleName;
     GetLocaleName(wsLocaleName);
     FXJSE_Value_SetUTF8String(
-        hValue, FX_UTF8Encode(wsLocaleName, wsLocaleName.GetLength()));
+        hValue,
+        FX_UTF8Encode(wsLocaleName, wsLocaleName.GetLength()).AsByteStringC());
   }
 }
 void CXFA_Node::Script_Subform_ExecEvent(CFXJSE_Arguments* pArguments) {
@@ -3497,7 +3509,8 @@ void CXFA_Node::Script_Form_Checksum(FXJSE_HVALUE hValue,
     CFX_WideString wsChecksum;
     GetAttribute(XFA_ATTRIBUTE_Checksum, wsChecksum, FALSE);
     FXJSE_Value_SetUTF8String(
-        hValue, FX_UTF8Encode(wsChecksum, wsChecksum.GetLength()));
+        hValue,
+        FX_UTF8Encode(wsChecksum, wsChecksum.GetLength()).AsByteStringC());
   }
 }
 void CXFA_Node::Script_Packet_GetAttribute(CFXJSE_Arguments* pArguments) {
@@ -3514,7 +3527,8 @@ void CXFA_Node::Script_Packet_GetAttribute(CFXJSE_Arguments* pArguments) {
     }
     FXJSE_Value_SetUTF8String(
         pArguments->GetReturnValue(),
-        FX_UTF8Encode(wsAttributeValue, wsAttributeValue.GetLength()));
+        FX_UTF8Encode(wsAttributeValue, wsAttributeValue.GetLength())
+            .AsByteStringC());
   } else {
     ThrowScriptErrorMessage(XFA_IDS_INCORRECT_NUMBER_OF_METHOD,
                             L"getAttribute");
@@ -3576,7 +3590,8 @@ void CXFA_Node::Script_Packet_Content(FXJSE_HVALUE hValue,
       pXMLElement->GetTextData(wsTextData);
     }
     FXJSE_Value_SetUTF8String(
-        hValue, FX_UTF8Encode(wsTextData, wsTextData.GetLength()));
+        hValue,
+        FX_UTF8Encode(wsTextData, wsTextData.GetLength()).AsByteStringC());
   }
 }
 void CXFA_Node::Script_Source_Next(CFXJSE_Arguments* pArguments) {
@@ -3728,7 +3743,8 @@ void CXFA_Node::Script_Script_Stateless(FXJSE_HVALUE hValue,
     ThrowScriptErrorMessage(XFA_IDS_INVAlID_PROP_SET);
     return;
   }
-  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(FX_WSTRC(L"0")));
+  FXJSE_Value_SetUTF8String(hValue,
+                            FX_UTF8Encode(FX_WSTRC(L"0")).AsByteStringC());
 }
 void CXFA_Node::Script_Encrypt_Format(FXJSE_HVALUE hValue,
                                       FX_BOOL bSetting,
diff --git a/xfa/fxfa/parser/xfa_script_eventpseudomodel.cpp b/xfa/fxfa/parser/xfa_script_eventpseudomodel.cpp
index f616596a7f..4cfcf1cbc7 100644
--- a/xfa/fxfa/parser/xfa_script_eventpseudomodel.cpp
+++ b/xfa/fxfa/parser/xfa_script_eventpseudomodel.cpp
@@ -34,7 +34,7 @@ void Script_EventPseudoModel_StringProperty(FXJSE_HVALUE hValue,
     FXJSE_Value_ToUTF8String(hValue, bsValue);
     wsValue = CFX_WideString::FromUTF8(bsValue, bsValue.GetLength());
   } else {
-    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsValue));
+    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsValue).AsByteStringC());
   }
 }
 void Script_EventPseudoModel_InterProperty(FXJSE_HVALUE hValue,
diff --git a/xfa/fxfa/parser/xfa_script_hostpseudomodel.cpp b/xfa/fxfa/parser/xfa_script_hostpseudomodel.cpp
index ad20b76380..74c6300e02 100644
--- a/xfa/fxfa/parser/xfa_script_hostpseudomodel.cpp
+++ b/xfa/fxfa/parser/xfa_script_hostpseudomodel.cpp
@@ -32,7 +32,7 @@ void CScript_HostPseudoModel::Script_HostPseudoModel_LoadString(
     uint32_t dwFlag) {
   CFX_WideString wsValue;
   pNotify->GetAppProvider()->LoadString(dwFlag, wsValue);
-  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsValue));
+  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsValue).AsByteStringC());
 }
 void CScript_HostPseudoModel::Script_HostPseudoModel_AppType(
     FXJSE_HVALUE hValue,
@@ -48,7 +48,7 @@ void CScript_HostPseudoModel::Script_HostPseudoModel_AppType(
   }
   CFX_WideString wsAppType;
   pNotify->GetAppProvider()->GetAppType(wsAppType);
-  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsAppType));
+  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsAppType).AsByteStringC());
 }
 void CScript_HostPseudoModel::Script_HostPseudoModel_FoxitAppType(
     FXJSE_HVALUE hValue,
@@ -64,7 +64,7 @@ void CScript_HostPseudoModel::Script_HostPseudoModel_FoxitAppType(
   }
   CFX_WideString wsAppType;
   pNotify->GetAppProvider()->GetFoxitAppType(wsAppType);
-  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsAppType));
+  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsAppType).AsByteStringC());
 }
 void CScript_HostPseudoModel::Script_HostPseudoModel_CalculationsEnabled(
     FXJSE_HVALUE hValue,
@@ -114,7 +114,7 @@ void CScript_HostPseudoModel::Script_HostPseudoModel_Language(
   }
   CFX_WideString wsLanguage;
   pNotify->GetAppProvider()->GetLanguage(wsLanguage);
-  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsLanguage));
+  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsLanguage).AsByteStringC());
 }
 void CScript_HostPseudoModel::Script_HostPseudoModel_NumPages(
     FXJSE_HVALUE hValue,
@@ -146,7 +146,7 @@ void CScript_HostPseudoModel::Script_HostPseudoModel_Platform(
   }
   CFX_WideString wsPlatform;
   pNotify->GetAppProvider()->GetPlatform(wsPlatform);
-  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsPlatform));
+  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsPlatform).AsByteStringC());
 }
 void CScript_HostPseudoModel::Script_HostPseudoModel_Title(
     FXJSE_HVALUE hValue,
@@ -169,7 +169,7 @@ void CScript_HostPseudoModel::Script_HostPseudoModel_Title(
   }
   CFX_WideString wsTitle;
   pNotify->GetDocProvider()->GetTitle(hDoc, wsTitle);
-  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsTitle));
+  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsTitle).AsByteStringC());
 }
 void CScript_HostPseudoModel::Script_HostPseudoModel_ValidationsEnabled(
     FXJSE_HVALUE hValue,
@@ -205,7 +205,7 @@ void CScript_HostPseudoModel::Script_HostPseudoModel_Variation(
   }
   CFX_WideString wsVariation;
   pNotify->GetAppProvider()->GetVariation(wsVariation);
-  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsVariation));
+  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsVariation).AsByteStringC());
 }
 void CScript_HostPseudoModel::Script_HostPseudoModel_Version(
     FXJSE_HVALUE hValue,
@@ -221,7 +221,7 @@ void CScript_HostPseudoModel::Script_HostPseudoModel_Version(
   }
   CFX_WideString wsVersion;
   pNotify->GetAppProvider()->GetVersion(wsVersion);
-  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsVersion));
+  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsVersion).AsByteStringC());
 }
 void CScript_HostPseudoModel::Script_HostPseudoModel_FoxitVersion(
     FXJSE_HVALUE hValue,
@@ -237,7 +237,7 @@ void CScript_HostPseudoModel::Script_HostPseudoModel_FoxitVersion(
   }
   CFX_WideString wsVersion;
   pNotify->GetAppProvider()->GetFoxitVersion(wsVersion);
-  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsVersion));
+  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsVersion).AsByteStringC());
 }
 void CScript_HostPseudoModel::Script_HostPseudoModel_Name(
     FXJSE_HVALUE hValue,
@@ -253,7 +253,7 @@ void CScript_HostPseudoModel::Script_HostPseudoModel_Name(
   }
   CFX_WideString wsAppName;
   pNotify->GetAppProvider()->GetAppName(wsAppName);
-  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsAppName));
+  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsAppName).AsByteStringC());
 }
 void CScript_HostPseudoModel::Script_HostPseudoModel_FoxitName(
     FXJSE_HVALUE hValue,
@@ -269,7 +269,8 @@ void CScript_HostPseudoModel::Script_HostPseudoModel_FoxitName(
   }
   CFX_WideString wsFoxitAppName;
   pNotify->GetAppProvider()->GetFoxitAppName(wsFoxitAppName);
-  FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsFoxitAppName));
+  FXJSE_Value_SetUTF8String(hValue,
+                            FX_UTF8Encode(wsFoxitAppName).AsByteStringC());
 }
 void CScript_HostPseudoModel::Script_HostPseudoModel_GotoURL(
     CFXJSE_Arguments* pArguments) {
@@ -388,7 +389,7 @@ void CScript_HostPseudoModel::Script_HostPseudoModel_Response(
                                       wsDefaultAnswer, bMark);
   FXJSE_HVALUE hValue = pArguments->GetReturnValue();
   if (hValue) {
-    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsAnswer));
+    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsAnswer).AsByteStringC());
   }
 }
 void CScript_HostPseudoModel::Script_HostPseudoModel_DocumentInBatch(
@@ -801,6 +802,7 @@ void CScript_HostPseudoModel::Script_HostPseudoModel_CurrentDateTime(
   CFX_WideString wsDataTime = pNotify->GetCurrentDateTime();
   FXJSE_HVALUE hValue = pArguments->GetReturnValue();
   if (hValue) {
-    FXJSE_Value_SetUTF8String(hValue, FX_UTF8Encode(wsDataTime));
+    FXJSE_Value_SetUTF8String(hValue,
+                              FX_UTF8Encode(wsDataTime).AsByteStringC());
   }
 }