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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_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
};
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_
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