Add support to extract viewer preference

core/src/fpdfdoc/doc_viewerPreferences.cpp

Index: core/src/fpdfdoc/doc_viewerPreferences.cpp
diff --git a/core/src/fpdfdoc/doc_viewerPreferences.cpp b/core/src/fpdfdoc/doc_viewerPreferences.cpp
index 617485cfc27b6e5b5d55da488991673826e65fbe..d5884095507a36d270b212cc69b91164394905a7 100644
--- a/core/src/fpdfdoc/doc_viewerPreferences.cpp
+++ b/core/src/fpdfdoc/doc_viewerPreferences.cpp
@@ -29,3 +29,34 @@ FX_BOOL CPDF_ViewerPreferences::PrintScaling() const
     }
     return FX_BSTRC("None") != pDict->GetString(FX_BSTRC("PrintScaling"));
 }
+FX_INT32 CPDF_ViewerPreferences::NumCopies() const
+{
+    CPDF_Dictionary *pDict = m_pDoc->GetRoot();
+    pDict = pDict->GetDict(FX_BSTRC("ViewerPreferences"));
+    if (!pDict)	{
+        return FALSE;
+    }
+    return pDict->GetInteger(FX_BSTRC("NumCopies"));
+}
+CPDF_Array* CPDF_ViewerPreferences::PrintPageRange() const
+{
+    CPDF_Dictionary *pDict = m_pDoc->GetRoot();
+    CPDF_Array *pRange = NULL;
+    pDict = pDict->GetDict(FX_BSTRC("ViewerPreferences"));
+    if (!pDict)	{
+        return pRange;
+    }
+    pRange = pDict->GetArray(FX_BSTRC("PrintPageRange"));
+    return pRange;
+}
+CFX_ByteString CPDF_ViewerPreferences::Duplex() const
+{
+    CPDF_Dictionary *pDict = m_pDoc->GetRoot();
+    CFX_ByteString duplex;
+    pDict = pDict->GetDict(FX_BSTRC("ViewerPreferences"));
+    if (!pDict)	{
+        return duplex;
+    }
+    duplex = pDict->GetString(FX_BSTRC("Duplex"));
+    return duplex;
+}