text: // Copyright 2016 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 "core/fpdfdoc/cpdf_viewerpreferences.h"
  
  #include "core/fpdfapi/parser/cpdf_dictionary.h"
  #include "core/fpdfapi/parser/cpdf_document.h"
  #include "core/fpdfapi/parser/cpdf_name.h"
  
  CPDF_ViewerPreferences::CPDF_ViewerPreferences(const CPDF_Document* pDoc)
      : m_pDoc(pDoc) {}
  
  CPDF_ViewerPreferences::~CPDF_ViewerPreferences() = default;
  
  bool CPDF_ViewerPreferences::IsDirectionR2L() const {
    const CPDF_Dictionary* pDict = GetViewerPreferences();
    return pDict && pDict->GetStringFor("Direction") == "R2L";
  }
  
  bool CPDF_ViewerPreferences::PrintScaling() const {
    const CPDF_Dictionary* pDict = GetViewerPreferences();
    return !pDict || pDict->GetStringFor("PrintScaling") != "None";
  }
  
  int32_t CPDF_ViewerPreferences::NumCopies() const {
    const CPDF_Dictionary* pDict = GetViewerPreferences();
    return pDict ? pDict->GetIntegerFor("NumCopies") : 1;
  }
  
  CPDF_Array* CPDF_ViewerPreferences::PrintPageRange() const {
    CPDF_Dictionary* pDict = GetViewerPreferences();
    return pDict ? pDict->GetArrayFor("PrintPageRange") : nullptr;
  }
  
  ByteString CPDF_ViewerPreferences::Duplex() const {
    const CPDF_Dictionary* pDict = GetViewerPreferences();
    return pDict ? pDict->GetStringFor("Duplex") : ByteString("None");
  }
  
  Optional<ByteString> CPDF_ViewerPreferences::GenericName(
      const ByteString& bsKey) const {
    const CPDF_Dictionary* pDict = GetViewerPreferences();
    if (!pDict)
      return {};
  
    const CPDF_Name* pName = ToName(pDict->GetObjectFor(bsKey));
    if (!pName)
      return {};
  
    return pName->GetString();
  }
  
  CPDF_Dictionary* CPDF_ViewerPreferences::GetViewerPreferences() const {
    CPDF_Dictionary* pDict = m_pDoc->GetRoot();
    return pDict ? pDict->GetDictFor("ViewerPreferences") : nullptr;
  }
  