Make more CPDF_Parser method const.

core/include/fpdfapi/fpdf_parser.h

 // Copyright 2014 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_INCLUDE_FPDFAPI_FPDF_PARSER_H_
 #define CORE_INCLUDE_FPDFAPI_FPDF_PARSER_H_
 
 #include <map>
 #include <memory>
 
+#include "core/include/fpdfapi/fpdf_objects.h"
 #include "core/include/fxcrt/fx_system.h"
-#include "fpdf_objects.h"
 
-class CFDF_Document;
-class CFDF_Parser;
-class CFX_DIBSource;
-class CFX_FloatRect;
 class CFX_Font;
 class CFX_Matrix;
-class CFX_PrivateData;
 class CPDF_ColorSpace;
 class CPDF_CryptoHandler;
 class CPDF_DocPageData;
 class CPDF_DocRenderData;
-class CPDF_Document;
 class CPDF_Font;
 class CPDF_FontEncoding;
-class CPDF_HintTables;
 class CPDF_IccProfile;
 class CPDF_Image;
-class CPDF_ModuleMgr;
 class CPDF_Object;
 class CPDF_Parser;
 class CPDF_Pattern;
-class CPDF_Point;
 class CPDF_SecurityHandler;
 class CPDF_StandardSecurityHandler;
 class IFX_FileRead;
 
 #define FPDFPERM_PRINT 0x0004
 #define FPDFPERM_MODIFY 0x0008
 #define FPDFPERM_EXTRACT 0x0010
 #define FPDFPERM_ANNOT_FORM 0x0020
 #define FPDFPERM_FILL_FORM 0x0100
 #define FPDFPERM_EXTRACT_ACCESS 0x0200
@@ skipping 365 matching lines @@
 
   CPDF_Dictionary* GetEncryptDict() { return m_pEncryptDict; }
 
   CPDF_Object* ParseIndirectObject(CPDF_IndirectObjects* pObjList,
                                    FX_DWORD objnum,
                                    PARSE_CONTEXT* pContext = NULL);
   FX_DWORD GetLastObjNum() const;
   bool IsValidObjectNumber(FX_DWORD objnum) const;
   FX_BOOL IsFormStream(FX_DWORD objnum, FX_BOOL& bForm);
 
-  FX_FILESIZE GetObjectOffset(FX_DWORD objnum);
+  FX_FILESIZE GetObjectOffset(FX_DWORD objnum) const;
 
-  FX_FILESIZE GetObjectSize(FX_DWORD objnum);
+  FX_FILESIZE GetObjectSize(FX_DWORD objnum) const;
 
   void GetIndirectBinary(FX_DWORD objnum, uint8_t*& pBuffer, FX_DWORD& size);
 
   IFX_FileRead* GetFileAccess() const { return m_Syntax.m_pFileAccess; }
 
   int GetFileVersion() const { return m_FileVersion; }
 
   FX_BOOL IsXRefStream() const { return m_bXRefStream; }
   CPDF_Object* ParseIndirectObjectAt(CPDF_IndirectObjects* pObjList,
                                      FX_FILESIZE pos,
                                      FX_DWORD objnum,
                                      struct PARSE_CONTEXT* pContext);
 
   CPDF_Object* ParseIndirectObjectAtByStrict(CPDF_IndirectObjects* pObjList,
                                              FX_FILESIZE pos,
                                              FX_DWORD objnum,
                                              struct PARSE_CONTEXT* pContext,
                                              FX_FILESIZE* pResultPos);
 
   FX_DWORD StartAsynParse(IFX_FileRead* pFile,
                           FX_BOOL bReParse = FALSE,
                           FX_BOOL bOwnFileRead = TRUE);
 
   FX_DWORD GetFirstPageNo() { return m_dwFirstPageNo; }
 
  protected:
-  CPDF_Document* m_pDocument;
-
-  CPDF_SyntaxParser m_Syntax;
-  FX_BOOL m_bOwnFileRead;
   CPDF_Object* ParseDirect(CPDF_Object* pObj);
 
   FX_BOOL LoadAllCrossRefV4(FX_FILESIZE pos);
 
   FX_BOOL LoadAllCrossRefV5(FX_FILESIZE pos);
 
   bool LoadCrossRefV4(FX_FILESIZE pos, FX_FILESIZE streampos, FX_BOOL bSkip);
 
   FX_BOOL LoadCrossRefV5(FX_FILESIZE* pos, FX_BOOL bMainXRef);
 
@@ skipping 12 matching lines @@
   FX_BOOL LoadLinearizedAllCrossRefV5(FX_FILESIZE pos);
 
   FX_DWORD LoadLinearizedMainXRefTable();
 
   CPDF_StreamAcc* GetObjectStream(FX_DWORD number);
 
   FX_BOOL IsLinearizedFile(IFX_FileRead* pFileAccess, FX_DWORD offset);
 
   bool FindPosInOffsets(FX_FILESIZE pos) const;
 
+  void SetEncryptDictionary(CPDF_Dictionary* pDict);
+
+  FX_FILESIZE GetObjectPositionOrZero(FX_DWORD objnum) const;
+
+  CPDF_Document* m_pDocument;
+
+  CPDF_SyntaxParser m_Syntax;
+  FX_BOOL m_bOwnFileRead;
   int m_FileVersion;
 
   CPDF_Dictionary* m_pTrailer;
 
   CPDF_Dictionary* m_pEncryptDict;
-  void SetEncryptDictionary(CPDF_Dictionary* pDict);
 
   FX_FILESIZE m_LastXRefOffset;
 
   FX_BOOL m_bXRefStream;
 
   std::unique_ptr<CPDF_SecurityHandler> m_pSecurityHandler;
 
   FX_BOOL m_bForceUseSecurityHandler;
 
   CFX_ByteString m_bsRecipient;
@@ skipping 492 matching lines @@
                        FX_DWORD src_size,
                        const CPDF_Dictionary* pDict,
                        uint8_t*& dest_buf,
                        FX_DWORD& dest_size,
                        CFX_ByteString& ImageEncoding,
                        CPDF_Dictionary*& pImageParms,
                        FX_DWORD estimated_size,
                        FX_BOOL bImageAcc);
 
 #endif  // CORE_INCLUDE_FPDFAPI_FPDF_PARSER_H_