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..b0f512bb6bc7184aab31aa8047d735b52d71e230 100644
--- a/core/src/fpdfdoc/doc_viewerPreferences.cpp
+++ b/core/src/fpdfdoc/doc_viewerPreferences.cpp
@@ -29,3 +29,43 @@ 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;

[Bo Xu, 2014/06/29 20:58:16]

The "NumCopies" entry is optional, and the default value is typically one. I
suggest to change to "return 1;" in line 37.

[Nikhil, 2014/07/07 08:54:18]

Done.

+    }
+    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;
+}
+CPDF_ViewerPreferences::DuplexType CPDF_ViewerPreferences::Duplex() const
+{
+    CPDF_Dictionary *pDict = m_pDoc->GetRoot();
+    CFX_ByteString duplex;
+    pDict = pDict->GetDict(FX_BSTRC("ViewerPreferences"));
+    if (!pDict)	{
+        return DuplexUndefined;
+    }
+
+    // Extract and map Duplex property.
+    duplex = pDict->GetString(FX_BSTRC("Duplex"));
+    if (FX_BSTRC("None") == duplex)
+        return DuplexUndefined;
+    if (FX_BSTRC("Simplex") == duplex)
+        return DuplexOff;
+    if (FX_BSTRC("DuplexFlipShortEdge") == duplex)
+        return DuplexFlipShortEdge;
+    if (FX_BSTRC("DuplexFlipLongEdge") == duplex)
+        return DuplexFlipLongEdge;
+}