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diff --git a/core/fpdfapi/parser/cpdf_hint_tables.h b/core/fpdfapi/parser/cpdf_hint_tables.h
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+++ b/core/fpdfapi/parser/cpdf_hint_tables.h
@@ -0,0 +1,71 @@
+// 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_FPDFAPI_PARSER_CPDF_HINT_TABLES_H_
+#define CORE_FPDFAPI_PARSER_CPDF_HINT_TABLES_H_
+
+#include <vector>
+
+#include "core/fpdfapi/parser/cpdf_data_avail.h"
+#include "core/fxcrt/fx_basic.h"
+#include "core/fxcrt/fx_stream.h"
+
+class CFX_BitStream;
+class CPDF_Dictionary;
+class CPDF_Stream;
+
+class CPDF_HintTables {
+ public:
+  CPDF_HintTables(CPDF_DataAvail* pDataAvail, CPDF_Dictionary* pLinearized);
+  virtual ~CPDF_HintTables();
+
+  bool GetPagePos(uint32_t index,
+                  FX_FILESIZE* szPageStartPos,
+                  FX_FILESIZE* szPageLength,
+                  uint32_t* dwObjNum);
+
+  CPDF_DataAvail::DocAvailStatus CheckPage(
+      uint32_t index,
+      CPDF_DataAvail::DownloadHints* pHints);
+
+  bool LoadHintStream(CPDF_Stream* pHintStream);
+
+ protected:
+  bool ReadPageHintTable(CFX_BitStream* hStream);
+  bool ReadSharedObjHintTable(CFX_BitStream* hStream, uint32_t offset);
+
+ private:
+  // Tests can override.
+  virtual int GetEndOfFirstPageOffset() const;
+  virtual int GetNumberOfPages() const;
+  virtual int GetFirstPageObjectNumber() const;
+  virtual int GetFirstPageNumber() const;
+  virtual int ReadPrimaryHintStreamOffset() const;
+  virtual int ReadPrimaryHintStreamLength() const;
+
+  // Helper for the ReadPrimaryHintStream methods above.
+  int ReadPrimaryHintStream(int index) const;
+
+  uint32_t GetItemLength(uint32_t index,
+                         const std::vector<FX_FILESIZE>& szArray);
+
+  // Owner, outlives this object.
+  CPDF_DataAvail* const m_pDataAvail;
+
+  // Owned by |m_pDataAvail|.
+  CPDF_Dictionary* const m_pLinearizedDict;
+
+  uint32_t m_nFirstPageSharedObjs;
+  FX_FILESIZE m_szFirstPageObjOffset;
+  std::vector<uint32_t> m_dwDeltaNObjsArray;
+  std::vector<uint32_t> m_dwNSharedObjsArray;
+  std::vector<uint32_t> m_dwSharedObjNumArray;
+  std::vector<uint32_t> m_dwIdentifierArray;
+  std::vector<FX_FILESIZE> m_szPageOffsetArray;
+  std::vector<FX_FILESIZE> m_szSharedObjOffsetArray;
+};
+
+#endif  // CORE_FPDFAPI_PARSER_CPDF_HINT_TABLES_H_