| // 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_SYNTAX_PARSER_H_ |
| #define CORE_FPDFAPI_PARSER_CPDF_SYNTAX_PARSER_H_ |
| |
| #include <algorithm> |
| #include <memory> |
| |
| #include "core/fxcrt/cfx_string_pool_template.h" |
| #include "core/fxcrt/cfx_weak_ptr.h" |
| #include "core/fxcrt/fx_basic.h" |
| |
| class CPDF_CryptoHandler; |
| class CPDF_Dictionary; |
| class CPDF_IndirectObjectHolder; |
| class CPDF_Object; |
| class CPDF_Stream; |
| class IFX_SeekableReadStream; |
| |
| class CPDF_SyntaxParser { |
| public: |
| CPDF_SyntaxParser(); |
| explicit CPDF_SyntaxParser(const CFX_WeakPtr<CFX_ByteStringPool>& pPool); |
| ~CPDF_SyntaxParser(); |
| |
| void InitParser(const CFX_RetainPtr<IFX_SeekableReadStream>& pFileAccess, |
| uint32_t HeaderOffset); |
| |
| FX_FILESIZE GetPos() const { return m_Pos; } |
| void SetPos(FX_FILESIZE pos) { m_Pos = std::min(pos, m_FileLen); } |
| |
| std::unique_ptr<CPDF_Object> GetObject(CPDF_IndirectObjectHolder* pObjList, |
| uint32_t objnum, |
| uint32_t gennum, |
| bool bDecrypt); |
| |
| std::unique_ptr<CPDF_Object> GetObjectForStrict( |
| CPDF_IndirectObjectHolder* pObjList, |
| uint32_t objnum, |
| uint32_t gennum); |
| |
| CFX_ByteString GetKeyword(); |
| void ToNextLine(); |
| void ToNextWord(); |
| bool BackwardsSearchToWord(const CFX_ByteStringC& word, FX_FILESIZE limit); |
| FX_FILESIZE FindTag(const CFX_ByteStringC& tag, FX_FILESIZE limit); |
| void SetEncrypt(const CFX_RetainPtr<CPDF_CryptoHandler>& pCryptoHandler); |
| bool ReadBlock(uint8_t* pBuf, uint32_t size); |
| bool GetCharAt(FX_FILESIZE pos, uint8_t& ch); |
| CFX_ByteString GetNextWord(bool* bIsNumber); |
| |
| private: |
| friend class CPDF_Parser; |
| friend class CPDF_DataAvail; |
| friend class cpdf_syntax_parser_ReadHexString_Test; |
| |
| static const int kParserMaxRecursionDepth = 64; |
| static int s_CurrentRecursionDepth; |
| |
| uint32_t GetDirectNum(); |
| bool ReadChar(FX_FILESIZE read_pos, uint32_t read_size); |
| bool GetNextChar(uint8_t& ch); |
| bool GetCharAtBackward(FX_FILESIZE pos, uint8_t* ch); |
| void GetNextWordInternal(bool* bIsNumber); |
| bool IsWholeWord(FX_FILESIZE startpos, |
| FX_FILESIZE limit, |
| const CFX_ByteStringC& tag, |
| bool checkKeyword); |
| |
| CFX_ByteString ReadString(); |
| CFX_ByteString ReadHexString(); |
| unsigned int ReadEOLMarkers(FX_FILESIZE pos); |
| std::unique_ptr<CPDF_Stream> ReadStream( |
| std::unique_ptr<CPDF_Dictionary> pDict, |
| uint32_t objnum, |
| uint32_t gennum); |
| |
| inline bool CheckPosition(FX_FILESIZE pos) { |
| return m_BufOffset >= pos || |
| static_cast<FX_FILESIZE>(m_BufOffset + m_BufSize) <= pos; |
| } |
| |
| FX_FILESIZE m_Pos; |
| uint32_t m_MetadataObjnum; |
| CFX_RetainPtr<IFX_SeekableReadStream> m_pFileAccess; |
| FX_FILESIZE m_HeaderOffset; |
| FX_FILESIZE m_FileLen; |
| uint8_t* m_pFileBuf; |
| uint32_t m_BufSize; |
| FX_FILESIZE m_BufOffset; |
| CFX_RetainPtr<CPDF_CryptoHandler> m_pCryptoHandler; |
| uint8_t m_WordBuffer[257]; |
| uint32_t m_WordSize; |
| CFX_WeakPtr<CFX_ByteStringPool> m_pPool; |
| }; |
| |
| #endif // CORE_FPDFAPI_PARSER_CPDF_SYNTAX_PARSER_H_ |