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diff --git a/core/fpdfdoc/csection.h b/core/fpdfdoc/csection.h
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+++ b/core/fpdfdoc/csection.h
@@ -0,0 +1,62 @@
+// 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
+
+#ifndef CORE_FPDFDOC_CSECTION_H_
+#define CORE_FPDFDOC_CSECTION_H_
+
+#include "core/fpdfdoc/cpvt_sectioninfo.h"
+#include "core/fpdfdoc/ctypeset.h"
+#include "core/fxcrt/include/fx_coordinates.h"
+#include "core/fxcrt/include/fx_system.h"
+
+class CPDF_VariableText;
+
+struct CPVT_LineInfo;
+struct CPVT_WordLine;
+struct CPVT_WordPlace;
+
+class CSection {
+ public:
+  explicit CSection(CPDF_VariableText* pVT);
+  virtual ~CSection();
+  void ResetAll();
+  void ResetLineArray();
+  void ResetWordArray();
+  void ResetLinePlace();
+  CPVT_WordPlace AddWord(const CPVT_WordPlace& place,
+                         const CPVT_WordInfo& wordinfo);
+  CPVT_WordPlace AddLine(const CPVT_LineInfo& lineinfo);
+  void ClearWords(const CPVT_WordRange& PlaceRange);
+  void ClearWord(const CPVT_WordPlace& place);
+  CPVT_FloatRect Rearrange();
+  CPVT_Size GetSectionSize(FX_FLOAT fFontSize);
+  CPVT_WordPlace GetBeginWordPlace() const;
+  CPVT_WordPlace GetEndWordPlace() const;
+  CPVT_WordPlace GetPrevWordPlace(const CPVT_WordPlace& place) const;
+  CPVT_WordPlace GetNextWordPlace(const CPVT_WordPlace& place) const;
+  void UpdateWordPlace(CPVT_WordPlace& place) const;
+  CPVT_WordPlace SearchWordPlace(const CFX_FloatPoint& point) const;
+  CPVT_WordPlace SearchWordPlace(FX_FLOAT fx,
+                                 const CPVT_WordPlace& lineplace) const;
+  CPVT_WordPlace SearchWordPlace(FX_FLOAT fx,
+                                 const CPVT_WordRange& range) const;
+
+  CPVT_WordPlace SecPlace;
+  CPVT_SectionInfo m_SecInfo;
+  CLines m_LineArray;
+  CPVT_ArrayTemplate<CPVT_WordInfo*> m_WordArray;
+
+ private:
+  friend class CTypeset;
+
+  void ClearLeftWords(int32_t nWordIndex);
+  void ClearRightWords(int32_t nWordIndex);
+  void ClearMidWords(int32_t nBeginIndex, int32_t nEndIndex);
+
+  CPDF_VariableText* m_pVT;
+};
+
+#endif  // CORE_FPDFDOC_CSECTION_H_