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#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;
}
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