summaryrefslogtreecommitdiff
path: root/core/include/fpdfapi/cpdf_parser.h
blob: 80a11077437bbeb7b9a6825a2217c2cdf998fe6f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
// 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_CryptoHandler;
class CPDF_Dictionary;
class CPDF_Document;
class CPDF_IndirectObjectHolder;
class CPDF_Object;
class CPDF_StreamAcc;
class CPDF_SyntaxParser;
class IFX_FileRead;
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);
  CPDF_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;
  FX_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_