Keep the declaration of FPDF_HasXFAField consistent with other XFA APIs

fpdfsdk/src/fpdfview.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
  
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "../include/fsdk_define.h"
 #include "../include/fsdk_mgr.h"
 #include "../include/fpdfview.h"
 #include "../include/fsdk_rendercontext.h"
@@ skipping 284 matching lines @@
                 return NULL;
         }
         CPDF_Document* pPDFDoc = pParser->GetDocument();
         if (!pPDFDoc)
                 return NULL;
 
         CPDFXFA_App* pProvider = FPDFXFA_GetApp();
         CPDFXFA_Document* pDocument = FX_NEW CPDFXFA_Document(pPDFDoc, pProvider);
         return pDocument;
 }
+
+DLLEXPORT FX_BOOL STDCALL FPDF_HasXFAField(FPDF_DOCUMENT document, int& docType)
+{
+        if (!document)
+                return FALSE;
+
+        CPDF_Dictionary* pRoot = ((CPDF_Document*)document)->GetRoot();
+        if (!pRoot)
+                return FALSE;
+
+        CPDF_Dictionary* pAcroForm = pRoot->GetDict("AcroForm");
+        if (!pAcroForm)
+                return FALSE;
+
+        CPDF_Object* pXFA = pAcroForm->GetElement("XFA");
+        if (!pXFA)
+                return FALSE;
+
+        FX_BOOL bDynamicXFA = pRoot->GetBoolean("NeedsRendering", FALSE);
+
+        if (bDynamicXFA)
+                docType = DOCTYPE_DYNIMIC_XFA;
+        else
+                docType = DOCTYPE_STATIC_XFA;
+
+        return TRUE;
+}
+
 DLLEXPORT  FPDF_BOOL STDCALL FPDF_LoadXFA(FPDF_DOCUMENT document)
 {
-        if (!document||!((CPDFXFA_Document*)document)->GetPDFDoc()) 
+        if (!document) 
                 return FALSE;
 
         int iDocType = DOCTYPE_PDF;
-        FX_BOOL hasXFAField = FPDF_HasXFAField(((CPDFXFA_Document*)document)->GetPDFDoc(), iDocType);
+        FX_BOOL hasXFAField = FPDF_HasXFAField(document, iDocType);
         if (!hasXFAField)
                 return FALSE;
         return ((CPDFXFA_Document*)document)->LoadXFADoc();
 }
 
 
 extern void CheckUnSupportError(CPDF_Document * pDoc, FX_DWORD err_code);
 
 class CMemFile FX_FINAL: public IFX_FileRead, public CFX_Object
 {
@@ skipping 738 matching lines @@
     if (!buffer) {
         buflen = len;
     } else if (buflen >= len) {
         memcpy(buffer, utf16Name.c_str(), len);
         buflen = len;
     } else {
         buflen = -1;
     }
     return (FPDF_DEST)pDestObj;
 }