Make down-conversion explicit from CFX_ByteString to CFX_ByteStringC.

core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp

Index: core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
diff --git a/core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp b/core/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
index 21934d35c48424f7e522c8ba760c9bfb341ab2f5..323602b0e10aa5e44b85d55b5674c3c422a3bd4c 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()) {