test_parsedoffset.cc
3.89 KB
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
#include <qpdf/QPDF.hh>
#include <qpdf/QPDFObjectHandle.hh>
#include <algorithm>
#include <cstdlib>
#include <iostream>
#include <map>
#include <set>
#include <sstream>
#include <string>
#include <vector>
void
usage()
{
std::cerr << "Usage: test_parsedoffset INPUT.pdf" << std::endl;
}
std::string
make_objdesc(qpdf_offset_t offset, QPDFObjectHandle obj)
{
std::stringstream ss;
ss << "offset = " << offset << " (0x" << std::hex << offset << std::dec << "), ";
if (obj.isIndirect()) {
ss << "indirect " << obj.getObjectID() << "/" << obj.getGeneration() << ", ";
} else {
ss << "direct, ";
}
ss << obj.getTypeName();
return ss.str();
}
void
walk(
size_t stream_number,
QPDFObjectHandle obj,
std::vector<std::vector<std::pair<qpdf_offset_t, std::string>>>& result)
{
qpdf_offset_t offset = obj.getParsedOffset();
std::pair<qpdf_offset_t, std::string> p = std::make_pair(offset, make_objdesc(offset, obj));
if (result.size() < stream_number + 1) {
result.resize(stream_number + 1);
}
result[stream_number].push_back(p);
if (obj.isArray()) {
for (auto& oh: obj.getArrayAsVector()) {
if (!oh.isIndirect()) {
// QPDF::GetAllObjects() enumerates all indirect objects.
// So only the direct objects are recursed here.
walk(stream_number, oh, result);
}
}
} else if (obj.isDictionary()) {
for (auto const& key: obj.getKeys()) {
QPDFObjectHandle item = obj.getKey(key);
if (!item.isIndirect()) {
// QPDF::GetAllObjects() enumerates all indirect objects.
// So only the direct objects are recursed here.
walk(stream_number, item, result);
}
}
} else if (obj.isStream()) {
walk(stream_number, obj.getDict(), result);
}
}
void
process(std::string fn, std::vector<std::vector<std::pair<qpdf_offset_t, std::string>>>& result)
{
QPDF qpdf;
qpdf.processFile(fn.c_str());
std::map<QPDFObjGen, QPDFXRefEntry> xrefs = qpdf.getXRefTable();
for (auto const& oh: qpdf.getAllObjects()) {
if (xrefs.count(oh.getObjGen()) == 0) {
std::cerr << oh.getObjectID() << "/" << oh.getGeneration()
<< " is not found in xref table" << std::endl;
std::exit(2);
}
QPDFXRefEntry xref = xrefs[oh.getObjGen()];
size_t stream_number;
switch (xref.getType()) {
case 0:
std::cerr << oh.getObjectID() << "/" << oh.getGeneration() << " xref entry is free"
<< std::endl;
std::exit(2);
case 1:
stream_number = 0;
break;
case 2:
stream_number = static_cast<size_t>(xref.getObjStreamNumber());
break;
default:
std::cerr << "unknown xref entry type" << std::endl;
std::exit(2);
}
walk(stream_number, oh, result);
}
}
int
main(int argc, char* argv[])
{
if (argc != 2) {
usage();
std::exit(2);
}
try {
std::vector<std::vector<std::pair<qpdf_offset_t, std::string>>> table;
process(argv[1], table);
for (size_t i = 0; i < table.size(); ++i) {
if (table[i].size() == 0) {
continue;
}
std::sort(table[i].begin(), table[i].end());
if (i == 0) {
std::cout << "--- objects not in streams ---" << std::endl;
} else {
std::cout << "--- objects in stream " << i << " ---" << std::endl;
}
for (auto const& iter: table[i]) {
std::cout << iter.second << std::endl;
}
}
std::cout << "succeeded" << std::endl;
} catch (std::exception& e) {
std::cerr << e.what() << std::endl;
std::exit(2);
}
return 0;
}