Fix infinite recursion in CPDF_Parser::ParseIndirectObjectAt().

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 _FPDF_PARSER_
 #define _FPDF_PARSER_
 #ifndef _FX_BASIC_H_
 #include "../fxcrt/fx_ext.h"
@@ skipping 243 matching lines @@
     FX_FILESIZE                 SavePos()
     {
         return m_Pos;
     }
 
     void                                RestorePos(FX_FILESIZE pos)
     {
         m_Pos = pos;
     }
 
-    CPDF_Object*                GetObject(CPDF_IndirectObjects* pObjList, FX_DWORD objnum, FX_DWORD gennum, int level, struct PARSE_CONTEXT* pContext = NULL, FX_BOOL bDecrypt = TRUE);
+    CPDF_Object*                GetObject(CPDF_IndirectObjects* pObjList, FX_DWORD objnum, FX_DWORD gennum, struct PARSE_CONTEXT* pContext = NULL, FX_BOOL bDecrypt = TRUE);
 
 
-    CPDF_Object*                GetObjectByStrict(CPDF_IndirectObjects* pObjList, FX_DWORD objnum, FX_DWORD gennum, int level, struct PARSE_CONTEXT* pContext = NULL);
+    CPDF_Object*                GetObjectByStrict(CPDF_IndirectObjects* pObjList, FX_DWORD objnum, FX_DWORD gennum, struct PARSE_CONTEXT* pContext = NULL);
 
     int                                 GetDirectNum();
 
     CFX_ByteString              GetString(FX_DWORD objnum, FX_DWORD gennum);
 
     CFX_ByteString              GetName();
 
     CFX_ByteString              GetKeyword();
 
     void                                GetBinary(FX_BYTE* buffer, FX_DWORD size);
@@ skipping 17 matching lines @@
     {
         return m_pCryptoHandler != NULL;
     }
 
     FX_BOOL                             GetCharAt(FX_FILESIZE pos, FX_BYTE& ch);
 
     FX_BOOL                             ReadBlock(FX_BYTE* pBuf, FX_DWORD size);
 
     CFX_ByteString              GetNextWord(FX_BOOL& bIsNumber);
 protected:
+    static const int kParserMaxRecursionDepth = 64;
+    static int s_CurrentRecursionDepth;
 
     virtual FX_BOOL                             GetNextChar(FX_BYTE& ch);
 
     FX_BOOL                             GetCharAtBackward(FX_FILESIZE pos, FX_BYTE& ch);
 
     void                                GetNextWord();
 
     FX_BOOL                             IsWholeWord(FX_FILESIZE startpos, FX_FILESIZE limit, FX_LPCBYTE tag, FX_DWORD taglen);
 
     CFX_ByteString              ReadString();
@@ skipping 198 matching lines @@
     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);
 
@@ skipping 406 matching lines @@
     PDF_DATAAVAIL_PAGETREE,
     PDF_DATAAVAIL_PAGE,
     PDF_DATAAVAIL_PAGE_LATERLOAD,
     PDF_DATAAVAIL_RESOURCES,
     PDF_DATAAVAIL_DONE,
     PDF_DATAAVAIL_ERROR,
     PDF_DATAAVAIL_LOADALLFILE,
     PDF_DATAAVAIL_TRAILER_APPEND
 };
 #endif