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diff --git a/core/src/fpdfapi/fpdf_parser/cpdf_syntax_parser.h b/core/src/fpdfapi/fpdf_parser/cpdf_syntax_parser.h
new file mode 100644
index 0000000000..44c98eafd8
--- /dev/null
+++ b/core/src/fpdfapi/fpdf_parser/cpdf_syntax_parser.h
@@ -0,0 +1,96 @@
+// 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_SRC_FPDFAPI_FPDF_PARSER_CPDF_SYNTAX_PARSER_H_
+#define CORE_SRC_FPDFAPI_FPDF_PARSER_CPDF_SYNTAX_PARSER_H_
+
+#include <memory>
+
+#include "core/include/fxcrt/fx_basic.h"
+
+class CPDF_CryptoHandler;
+class CPDF_IndirectObjectHolder;
+class CPDF_Object;
+class CPDF_Dictionary;
+class CPDF_Stream;
+class IFX_FileRead;
+
+class CPDF_SyntaxParser {
+ public:
+  CPDF_SyntaxParser();
+  ~CPDF_SyntaxParser();
+
+  void InitParser(IFX_FileRead* pFileAccess, FX_DWORD HeaderOffset);
+
+  FX_FILESIZE SavePos() const { return m_Pos; }
+  void RestorePos(FX_FILESIZE pos) { m_Pos = pos; }
+
+  CPDF_Object* GetObject(CPDF_IndirectObjectHolder* pObjList,
+                         FX_DWORD objnum,
+                         FX_DWORD gennum,
+                         FX_BOOL bDecrypt);
+  CPDF_Object* GetObjectByStrict(CPDF_IndirectObjectHolder* pObjList,
+                                 FX_DWORD objnum,
+                                 FX_DWORD gennum);
+  CFX_ByteString GetKeyword();
+
+  void ToNextLine();
+  void ToNextWord();
+
+  FX_BOOL SearchWord(const CFX_ByteStringC& word,
+                     FX_BOOL bWholeWord,
+                     FX_BOOL bForward,
+                     FX_FILESIZE limit);
+  int SearchMultiWord(const CFX_ByteStringC& words,
+                      FX_BOOL bWholeWord,
+                      FX_FILESIZE limit);
+  FX_FILESIZE FindTag(const CFX_ByteStringC& tag, FX_FILESIZE limit);
+
+  void SetEncrypt(std::unique_ptr<CPDF_CryptoHandler> pCryptoHandler);
+
+  FX_BOOL ReadBlock(uint8_t* pBuf, FX_DWORD size);
+  FX_BOOL GetCharAt(FX_FILESIZE pos, uint8_t& ch);
+  CFX_ByteString GetNextWord(bool* bIsNumber);
+
+ private:
+  friend class CPDF_Parser;
+  friend class CPDF_DataAvail;
+  friend class fpdf_parser_parser_ReadHexString_Test;
+
+  static const int kParserMaxRecursionDepth = 64;
+  static int s_CurrentRecursionDepth;
+
+  uint32_t GetDirectNum();
+
+  FX_BOOL GetNextChar(uint8_t& ch);
+  FX_BOOL GetCharAtBackward(FX_FILESIZE pos, uint8_t& ch);
+  void GetNextWordInternal(bool* bIsNumber);
+  bool IsWholeWord(FX_FILESIZE startpos,
+                   FX_FILESIZE limit,
+                   const CFX_ByteStringC& tag,
+                   FX_BOOL checkKeyword);
+
+  CFX_ByteString ReadString();
+  CFX_ByteString ReadHexString();
+  unsigned int ReadEOLMarkers(FX_FILESIZE pos);
+  CPDF_Stream* ReadStream(CPDF_Dictionary* pDict,
+                          FX_DWORD objnum,
+                          FX_DWORD gennum);
+
+  FX_FILESIZE m_Pos;
+  int m_MetadataObjnum;
+  IFX_FileRead* m_pFileAccess;
+  FX_DWORD m_HeaderOffset;
+  FX_FILESIZE m_FileLen;
+  uint8_t* m_pFileBuf;
+  FX_DWORD m_BufSize;
+  FX_FILESIZE m_BufOffset;
+  std::unique_ptr<CPDF_CryptoHandler> m_pCryptoHandler;
+  uint8_t m_WordBuffer[257];
+  FX_DWORD m_WordSize;
+};
+
+#endif  // CORE_SRC_FPDFAPI_FPDF_PARSER_CPDF_SYNTAX_PARSER_H_