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// 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_INCLUDE_FPDFAPI_CPDF_PARSER_H_
#define CORE_INCLUDE_FPDFAPI_CPDF_PARSER_H_
#include <map>
#include <memory>
#include <set>
#include "core/include/fxcrt/fx_basic.h"
class CPDF_Array;
class CPDF_Dictionary;
class CPDF_Document;
class CPDF_IndirectObjectHolder;
class CPDF_Object;
class CPDF_StreamAcc;
class CPDF_SyntaxParser;
class IFX_FileRead;
class IPDF_CryptoHandler;
class IPDF_SecurityHandler;
class CPDF_Parser {
public:
enum Error {
SUCCESS = 0,
FILE_ERROR,
FORMAT_ERROR,
PASSWORD_ERROR,
HANDLER_ERROR
};
CPDF_Parser();
~CPDF_Parser();
Error StartParse(IFX_FileRead* pFile);
FX_DWORD GetPermissions(FX_BOOL bCheckRevision = FALSE);
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; }
FX_DWORD GetRootObjNum();
FX_DWORD GetInfoObjNum();
CPDF_Array* GetIDArray();
CPDF_Dictionary* GetEncryptDict() const { return m_pEncryptDict; }
CPDF_Object* ParseIndirectObject(CPDF_IndirectObjectHolder* pObjList,
FX_DWORD objnum);
FX_DWORD GetLastObjNum() const;
bool IsValidObjectNumber(FX_DWORD objnum) const;
FX_FILESIZE GetObjectPositionOrZero(FX_DWORD objnum) const;
uint8_t GetObjectType(FX_DWORD objnum) const;
uint16_t GetObjectGenNum(FX_DWORD objnum) const;
bool IsVersionUpdated() const { return m_bVersionUpdated; }
bool IsObjectFreeOrNull(FX_DWORD objnum) const;
FX_BOOL IsFormStream(FX_DWORD objnum, FX_BOOL& bForm);
IPDF_CryptoHandler* GetCryptoHandler();
IFX_FileRead* GetFileAccess() const;
FX_FILESIZE GetObjectOffset(FX_DWORD objnum) const;
FX_FILESIZE GetObjectSize(FX_DWORD objnum) const;
void GetIndirectBinary(FX_DWORD objnum, uint8_t*& pBuffer, FX_DWORD& size);
int GetFileVersion() const { return m_FileVersion; }
FX_BOOL IsXRefStream() const { return m_bXRefStream; }
CPDF_Object* ParseIndirectObjectAt(CPDF_IndirectObjectHolder* pObjList,
FX_FILESIZE pos,
FX_DWORD objnum);
CPDF_Object* ParseIndirectObjectAtByStrict(
CPDF_IndirectObjectHolder* pObjList,
FX_FILESIZE pos,
FX_DWORD objnum,
FX_FILESIZE* pResultPos);
Error StartAsyncParse(IFX_FileRead* pFile);
FX_DWORD GetFirstPageNo() const { return m_dwFirstPageNo; }
protected:
struct ObjectInfo {
ObjectInfo() : pos(0), type(0), gennum(0) {}
FX_FILESIZE pos;
uint8_t type;
uint16_t gennum;
};
void CloseParser();
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);
CPDF_Dictionary* LoadTrailerV4();
FX_BOOL RebuildCrossRef();
Error SetEncryptHandler();
void ReleaseEncryptHandler();
FX_BOOL LoadLinearizedAllCrossRefV4(FX_FILESIZE pos, FX_DWORD dwObjCount);
FX_BOOL LoadLinearizedCrossRefV4(FX_FILESIZE pos, FX_DWORD dwObjCount);
FX_BOOL LoadLinearizedAllCrossRefV5(FX_FILESIZE pos);
Error LoadLinearizedMainXRefTable();
CPDF_StreamAcc* GetObjectStream(FX_DWORD number);
FX_BOOL IsLinearizedFile(IFX_FileRead* pFileAccess, FX_DWORD offset);
void SetEncryptDictionary(CPDF_Dictionary* pDict);
void ShrinkObjectMap(FX_DWORD size);
CPDF_Document* m_pDocument;
std::unique_ptr<CPDF_SyntaxParser> m_pSyntax;
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<IPDF_SecurityHandler> m_pSecurityHandler;
CFX_ByteString m_bsRecipient;
CFX_ByteString m_FilePath;
CFX_ByteString m_Password;
std::map<FX_DWORD, ObjectInfo> m_ObjectInfo;
std::set<FX_FILESIZE> m_SortedOffset;
CFX_ArrayTemplate<CPDF_Dictionary*> m_Trailers;
bool m_bVersionUpdated;
CPDF_Object* m_pLinearized;
FX_DWORD m_dwFirstPageNo;
FX_DWORD m_dwXrefStartObjNum;
// A map of object numbers to indirect streams. Map owns the streams.
std::map<FX_DWORD, 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<FX_DWORD, FX_DWORD>;
// 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<FX_DWORD> m_ParsingObjNums;
friend class CPDF_DataAvail;
private:
enum class ParserState {
kDefault,
kComment,
kWhitespace,
kString,
kHexString,
kEscapedString,
kXref,
kObjNum,
kPostObjNum,
kGenNum,
kPostGenNum,
kTrailer,
kBeginObj,
kEndObj
};
};
#endif // CORE_INCLUDE_FPDFAPI_CPDF_PARSER_H_
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