| // 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_CPDF_PARSER_H_ |
| #define CORE_FPDFAPI_FPDF_PARSER_INCLUDE_CPDF_PARSER_H_ |
| |
| #include <map> |
| #include <memory> |
| #include <set> |
| |
| #include "core/fxcrt/include/fx_basic.h" |
| |
| class CPDF_Array; |
| class CPDF_CryptoHandler; |
| class CPDF_Dictionary; |
| class CPDF_Document; |
| class CPDF_IndirectObjectHolder; |
| class CPDF_Object; |
| class CPDF_SecurityHandler; |
| class CPDF_StreamAcc; |
| class CPDF_SyntaxParser; |
| class IFX_FileRead; |
| |
| class CPDF_Parser { |
| public: |
| enum Error { |
| SUCCESS = 0, |
| FILE_ERROR, |
| FORMAT_ERROR, |
| PASSWORD_ERROR, |
| HANDLER_ERROR |
| }; |
| |
| // A limit on the maximum object number in the xref table. Theoretical limits |
| // are higher, but this may be large enough in practice. |
| static const uint32_t kMaxObjectNumber = 1048576; |
| |
| CPDF_Parser(); |
| ~CPDF_Parser(); |
| |
| Error StartParse(IFX_FileRead* pFile, CPDF_Document* pDocument); |
| Error StartLinearizedParse(IFX_FileRead* pFile, CPDF_Document* pDocument); |
| |
| void SetPassword(const FX_CHAR* password) { m_Password = password; } |
| CFX_ByteString GetPassword() { return m_Password; } |
| CPDF_Dictionary* GetTrailer() const { return m_pTrailer; } |
| FX_FILESIZE GetLastXRefOffset() const { return m_LastXRefOffset; } |
| CPDF_Document* GetDocument() const { return m_pDocument; } |
| |
| uint32_t GetPermissions() const; |
| uint32_t GetRootObjNum(); |
| uint32_t GetInfoObjNum(); |
| CPDF_Array* GetIDArray(); |
| |
| CPDF_Dictionary* GetEncryptDict() const { return m_pEncryptDict; } |
| |
| CPDF_Object* ParseIndirectObject(CPDF_IndirectObjectHolder* pObjList, |
| uint32_t objnum); |
| |
| uint32_t GetLastObjNum() const; |
| bool IsValidObjectNumber(uint32_t objnum) const; |
| FX_FILESIZE GetObjectPositionOrZero(uint32_t objnum) const; |
| uint8_t GetObjectType(uint32_t objnum) const; |
| uint16_t GetObjectGenNum(uint32_t objnum) const; |
| bool IsVersionUpdated() const { return m_bVersionUpdated; } |
| bool IsObjectFreeOrNull(uint32_t objnum) const; |
| FX_BOOL IsFormStream(uint32_t objnum, FX_BOOL& bForm); |
| CPDF_CryptoHandler* GetCryptoHandler(); |
| IFX_FileRead* GetFileAccess() const; |
| |
| FX_FILESIZE GetObjectOffset(uint32_t objnum) const; |
| FX_FILESIZE GetObjectSize(uint32_t objnum) const; |
| |
| void GetIndirectBinary(uint32_t objnum, uint8_t*& pBuffer, uint32_t& size); |
| int GetFileVersion() const { return m_FileVersion; } |
| FX_BOOL IsXRefStream() const { return m_bXRefStream; } |
| |
| CPDF_Object* ParseIndirectObjectAt(CPDF_IndirectObjectHolder* pObjList, |
| FX_FILESIZE pos, |
| uint32_t objnum); |
| |
| CPDF_Object* ParseIndirectObjectAtByStrict( |
| CPDF_IndirectObjectHolder* pObjList, |
| FX_FILESIZE pos, |
| uint32_t objnum, |
| FX_FILESIZE* pResultPos); |
| |
| uint32_t GetFirstPageNo() const { return m_dwFirstPageNo; } |
| |
| protected: |
| struct ObjectInfo { |
| ObjectInfo() : pos(0), type(0), gennum(0) {} |
| |
| FX_FILESIZE pos; |
| uint8_t type; |
| uint16_t gennum; |
| }; |
| |
| std::unique_ptr<CPDF_SyntaxParser> m_pSyntax; |
| std::map<uint32_t, ObjectInfo> m_ObjectInfo; |
| |
| bool LoadCrossRefV4(FX_FILESIZE pos, FX_FILESIZE streampos, FX_BOOL bSkip); |
| FX_BOOL RebuildCrossRef(); |
| |
| private: |
| friend class CPDF_DataAvail; |
| |
| enum class ParserState { |
| kDefault, |
| kComment, |
| kWhitespace, |
| kString, |
| kHexString, |
| kEscapedString, |
| kXref, |
| kObjNum, |
| kPostObjNum, |
| kGenNum, |
| kPostGenNum, |
| kTrailer, |
| kBeginObj, |
| kEndObj |
| }; |
| |
| CPDF_Object* ParseDirect(CPDF_Object* pObj); |
| FX_BOOL LoadAllCrossRefV4(FX_FILESIZE pos); |
| FX_BOOL LoadAllCrossRefV5(FX_FILESIZE pos); |
| FX_BOOL LoadCrossRefV5(FX_FILESIZE* pos, FX_BOOL bMainXRef); |
| CPDF_Dictionary* LoadTrailerV4(); |
| Error SetEncryptHandler(); |
| void ReleaseEncryptHandler(); |
| FX_BOOL LoadLinearizedAllCrossRefV4(FX_FILESIZE pos, uint32_t dwObjCount); |
| FX_BOOL LoadLinearizedCrossRefV4(FX_FILESIZE pos, uint32_t dwObjCount); |
| FX_BOOL LoadLinearizedAllCrossRefV5(FX_FILESIZE pos); |
| Error LoadLinearizedMainXRefTable(); |
| CPDF_StreamAcc* GetObjectStream(uint32_t number); |
| FX_BOOL IsLinearizedFile(IFX_FileRead* pFileAccess, uint32_t offset); |
| void SetEncryptDictionary(CPDF_Dictionary* pDict); |
| void ShrinkObjectMap(uint32_t size); |
| // A simple check whether the cross reference table matches with |
| // the objects. |
| bool VerifyCrossRefV4(); |
| |
| CPDF_Document* m_pDocument; // not owned |
| bool m_bHasParsed; |
| bool m_bOwnFileRead; |
| int m_FileVersion; |
| CPDF_Dictionary* m_pTrailer; |
| CPDF_Dictionary* m_pEncryptDict; |
| FX_FILESIZE m_LastXRefOffset; |
| FX_BOOL m_bXRefStream; |
| std::unique_ptr<CPDF_SecurityHandler> m_pSecurityHandler; |
| CFX_ByteString m_Password; |
| std::set<FX_FILESIZE> m_SortedOffset; |
| CFX_ArrayTemplate<CPDF_Dictionary*> m_Trailers; |
| bool m_bVersionUpdated; |
| CPDF_Object* m_pLinearized; |
| uint32_t m_dwFirstPageNo; |
| uint32_t m_dwXrefStartObjNum; |
| |
| // A map of object numbers to indirect streams. Map owns the streams. |
| std::map<uint32_t, std::unique_ptr<CPDF_StreamAcc>> m_ObjectStreamMap; |
| |
| // Mapping of object numbers to offsets. The offsets are relative to the first |
| // object in the stream. |
| using StreamObjectCache = std::map<uint32_t, uint32_t>; |
| |
| // Mapping of streams to their object caches. This is valid as long as the |
| // streams in |m_ObjectStreamMap| are valid. |
| std::map<CPDF_StreamAcc*, StreamObjectCache> m_ObjCache; |
| |
| // All indirect object numbers that are being parsed. |
| std::set<uint32_t> m_ParsingObjNums; |
| }; |
| |
| #endif // CORE_FPDFAPI_FPDF_PARSER_INCLUDE_CPDF_PARSER_H_ |