Add support to extract viewer preference

fpdfsdk/src/fpdfview.cpp

Index: fpdfsdk/src/fpdfview.cpp
diff --git a/fpdfsdk/src/fpdfview.cpp b/fpdfsdk/src/fpdfview.cpp
index a5ba796158705184300e27a699a48ce64c4b02f6..d440e119f5815a597993f9d536081b8b3a33e464 100644
--- a/fpdfsdk/src/fpdfview.cpp
+++ b/fpdfsdk/src/fpdfview.cpp
@@ -863,9 +863,36 @@ DLLEXPORT FPDF_BOOL STDCALL FPDF_VIEWERREF_GetPrintScaling(FPDF_DOCUMENT documen
 	CPDF_Document* pDoc = (CPDF_Document*)document;
 	if (!pDoc) return TRUE;
 	CPDF_ViewerPreferences viewRef(pDoc);
+

[Vitaly Buka (NO REVIEWS), 2014/06/24 21:53:46]

please remove this empty line

[Nikhil, 2014/06/25 09:09:47]

Done.

 	return viewRef.PrintScaling();
 }
 
+DLLEXPORT int STDCALL FPDF_VIEWERREF_GetNumCopies(FPDF_DOCUMENT document)
+{
+    CPDF_Document* pDoc = (CPDF_Document*)document;
+    if (!pDoc) return TRUE;
+    CPDF_ViewerPreferences viewRef(pDoc);
+    return viewRef.NumCopies();
+}
+
+DLLEXPORT FPDF_PAGERANGE STDCALL FPDF_VIEWERREF_GetPrintPageRange(FPDF_DOCUMENT document)
+{
+    CPDF_Document* pDoc = (CPDF_Document*)document;
+    if (!pDoc) return NULL;
+    CPDF_ViewerPreferences viewRef(pDoc);
+    return viewRef.PrintPageRange();
+}
+
+DLLEXPORT FPDF_BYTESTRING STDCALL FPDF_VIEWERREF_GetDuplex(FPDF_DOCUMENT document)
+{
+    CPDF_Document* pDoc = (CPDF_Document*)document;
+    FPDF_BYTESTRING duplex;
+    if (!pDoc) return duplex;
+    CPDF_ViewerPreferences viewRef(pDoc);
+    duplex = viewRef.Duplex();
+    return duplex;
+}
+
 DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDestByName(FPDF_DOCUMENT document,FPDF_BYTESTRING name)
 {
 	if (document == NULL)