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
|
//========================================================================
//
// XRef.h
//
// Copyright 1996-2003 Glyph & Cog, LLC
//
//========================================================================
#ifndef XREF_H
#define XREF_H
#ifdef USE_GCC_PRAGMAS
#pragma interface
#endif
#include "goo/gtypes.h"
#include "Object.h"
class Dict;
class Stream;
class Parser;
class ObjectStream;
//------------------------------------------------------------------------
// XRef
//------------------------------------------------------------------------
enum XRefEntryType {
xrefEntryFree,
xrefEntryUncompressed,
xrefEntryCompressed
};
struct XRefEntry {
Guint offset;
int gen;
XRefEntryType type;
};
class XRef {
public:
// Constructor. Read xref table from stream.
XRef(BaseStream *strA, GooString *ownerPassword, GooString *userPassword);
// Destructor.
~XRef();
// Is xref table valid?
GBool isOk() { return ok; }
// Get the error code (if isOk() returns false).
int getErrorCode() { return errCode; }
// Is the file encrypted?
#ifndef NO_DECRYPTION
GBool isEncrypted() { return encrypted; }
#else
GBool isEncrypted() { return gFalse; }
#endif
// Check various permissions.
GBool okToPrint(GBool ignoreOwnerPW = gFalse);
GBool okToPrintHighRes(GBool ignoreOwnerPW = gFalse);
GBool okToChange(GBool ignoreOwnerPW = gFalse);
GBool okToCopy(GBool ignoreOwnerPW = gFalse);
GBool okToAddNotes(GBool ignoreOwnerPW = gFalse);
GBool okToFillForm(GBool ignoreOwnerPW = gFalse);
GBool okToAccessibility(GBool ignoreOwnerPW = gFalse);
GBool okToAssemble(GBool ignoreOwnerPW = gFalse);
// Get catalog object.
Object *getCatalog(Object *obj) { return fetch(rootNum, rootGen, obj); }
// Fetch an indirect reference.
Object *fetch(int num, int gen, Object *obj);
// Return the document's Info dictionary (if any).
Object *getDocInfo(Object *obj);
Object *getDocInfoNF(Object *obj);
// Return the number of objects in the xref table.
int getNumObjects() { return size; }
// Return the offset of the last xref table.
Guint getLastXRefPos() { return lastXRefPos; }
// Return the catalog object reference.
int getRootNum() { return rootNum; }
int getRootGen() { return rootGen; }
// Get end position for a stream in a damaged file.
// Returns false if unknown or file is not damaged.
GBool getStreamEnd(Guint streamStart, Guint *streamEnd);
// Direct access.
int getSize() { return size; }
XRefEntry *getEntry(int i) { return &entries[i]; }
Object *getTrailerDict() { return &trailerDict; }
private:
BaseStream *str; // input stream
Guint start; // offset in file (to allow for garbage
// at beginning of file)
XRefEntry *entries; // xref entries
int size; // size of <entries> array
int rootNum, rootGen; // catalog dict
GBool ok; // true if xref table is valid
int errCode; // error code (if <ok> is false)
Object trailerDict; // trailer dictionary
Guint lastXRefPos; // offset of last xref table
Guint *streamEnds; // 'endstream' positions - only used in
// damaged files
int streamEndsLen; // number of valid entries in streamEnds
ObjectStream *objStr; // cached object stream
#ifndef NO_DECRYPTION
GBool encrypted; // true if file is encrypted
int encVersion; // encryption algorithm
int encRevision; // security handler revision
int keyLength; // length of key, in bytes
int permFlags; // permission bits
Guchar fileKey[16]; // file decryption key
GBool ownerPasswordOk; // true if owner password is correct
#endif
Guint getStartXref();
GBool readXRef(Guint *pos);
GBool readXRefTable(Parser *parser, Guint *pos);
GBool readXRefStreamSection(Stream *xrefStr, int *w, int first, int n);
GBool readXRefStream(Stream *xrefStr, Guint *pos);
GBool constructXRef();
GBool checkEncrypted(GooString *ownerPassword, GooString *userPassword);
Guint strToUnsigned(char *s);
};
#endif
|
