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diff --git a/core/fpdfapi/fpdf_parser/include/ipdf_data_avail.h b/core/fpdfapi/fpdf_parser/include/ipdf_data_avail.h
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index 0000000000..90d137c34a
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+++ b/core/fpdfapi/fpdf_parser/include/ipdf_data_avail.h
@@ -0,0 +1,80 @@
+// 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_FPDF_PARSER_INCLUDE_IPDF_DATA_AVAIL_H_
+#define CORE_FPDFAPI_FPDF_PARSER_INCLUDE_IPDF_DATA_AVAIL_H_
+
+#include "core/include/fxcrt/fx_stream.h"
+#include "core/include/fxcrt/fx_system.h"
+
+class CPDF_Document;
+class CPDF_Object;
+
+class IPDF_DataAvail {
+ public:
+  // Must match PDF_DATA_* definitions in public/fpdf_dataavail.h, but cannot
+  // #include that header. fpdfsdk/fpdf_dataavail.cpp has static_asserts
+  // to make sure the two sets of values match.
+  enum DocAvailStatus {
+    DataError = -1,        // PDF_DATA_ERROR
+    DataNotAvailable = 0,  // PDF_DATA_NOTAVAIL
+    DataAvailable = 1,     // PDF_DATA_AVAIL
+  };
+
+  // Must match PDF_*LINEAR* definitions in public/fpdf_dataavail.h, but cannot
+  // #include that header. fpdfsdk/fpdf_dataavail.cpp has static_asserts
+  // to make sure the two sets of values match.
+  enum DocLinearizationStatus {
+    LinearizationUnknown = -1,  // PDF_LINEARIZATION_UNKNOWN
+    NotLinearized = 0,          // PDF_NOT_LINEARIZED
+    Linearized = 1,             // PDF_LINEARIZED
+  };
+
+  // Must match PDF_FORM_* definitions in public/fpdf_dataavail.h, but cannot
+  // #include that header. fpdfsdk/fpdf_dataavail.cpp has static_asserts
+  // to make sure the two sets of values match.
+  enum DocFormStatus {
+    FormError = -1,        // PDF_FORM_ERROR
+    FormNotAvailable = 0,  // PDF_FORM_NOTAVAIL
+    FormAvailable = 1,     // PDF_FORM_AVAIL
+    FormNotExist = 2,      // PDF_FORM_NOTEXIST
+  };
+
+  class FileAvail {
+   public:
+    virtual ~FileAvail();
+    virtual FX_BOOL IsDataAvail(FX_FILESIZE offset, FX_DWORD size) = 0;
+  };
+
+  class DownloadHints {
+   public:
+    virtual ~DownloadHints();
+    virtual void AddSegment(FX_FILESIZE offset, FX_DWORD size) = 0;
+  };
+
+  static IPDF_DataAvail* Create(FileAvail* pFileAvail, IFX_FileRead* pFileRead);
+  virtual ~IPDF_DataAvail();
+
+  FileAvail* GetFileAvail() const { return m_pFileAvail; }
+  IFX_FileRead* GetFileRead() const { return m_pFileRead; }
+
+  virtual DocAvailStatus IsDocAvail(DownloadHints* pHints) = 0;
+  virtual void SetDocument(CPDF_Document* pDoc) = 0;
+  virtual DocAvailStatus IsPageAvail(int iPage, DownloadHints* pHints) = 0;
+  virtual FX_BOOL IsLinearized() = 0;
+  virtual DocFormStatus IsFormAvail(DownloadHints* pHints) = 0;
+  virtual DocLinearizationStatus IsLinearizedPDF() = 0;
+  virtual void GetLinearizedMainXRefInfo(FX_FILESIZE* pPos,
+                                         FX_DWORD* pSize) = 0;
+
+ protected:
+  IPDF_DataAvail(FileAvail* pFileAvail, IFX_FileRead* pFileRead);
+
+  FileAvail* m_pFileAvail;
+  IFX_FileRead* m_pFileRead;
+};
+
+#endif  // CORE_FPDFAPI_FPDF_PARSER_INCLUDE_IPDF_DATA_AVAIL_H_