fpdfsdk/ differences with XFA (for didactic purposes only).

fpdfsdk/src/javascript/app.cpp

Index: fpdfsdk/src/javascript/app.cpp
diff --git a/fpdfsdk/src/javascript/app.cpp b/fpdfsdk/src/javascript/app.cpp
index 205673e6d5a41d9444b71ef31fb2a3bc3ab625a3..d18e0322abff79c17035657eb85f9a354cc11913 100644
--- a/fpdfsdk/src/javascript/app.cpp
+++ b/fpdfsdk/src/javascript/app.cpp
@@ -47,6 +47,9 @@ CJS_Timer* TimerObj::GetTimer() const {
 #define JS_STR_PLATFORM L"WIN"
 #define JS_STR_LANGUANGE L"ENU"
 #define JS_NUM_VIEWERVERSION 8
+#ifdef PDF_ENABLE_XFA
+#define JS_NUM_VIEWERVERSION_XFA 11
+#endif
 #define JS_NUM_FORMSVERSION 7
 
 BEGIN_JS_STATIC_CONST(CJS_App)
@@ -197,6 +200,16 @@ FX_BOOL app::viewerVersion(IJS_Context* cc,
   if (!vp.IsGetting())
     return FALSE;
 
+#ifdef PDF_ENABLE_XFA
+  CJS_Context* pContext = (CJS_Context*)cc;
+  CPDFSDK_Document* pCurDoc = pContext->GetReaderDocument();
+  CPDFXFA_Document* pDoc = pCurDoc->GetXFADocument();
+  if (pDoc->GetDocType() == 1 || pDoc->GetDocType() == 2) {
+    vp << JS_NUM_VIEWERVERSION_XFA;
+    return TRUE;
+  }
+
+#endif
   vp << JS_NUM_VIEWERVERSION;
   return TRUE;
 }