pdf-bookmarks.cc
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#include <qpdf/QIntC.hh>
#include <qpdf/QPDF.hh>
#include <qpdf/QPDFOutlineDocumentHelper.hh>
#include <qpdf/QPDFPageDocumentHelper.hh>
#include <qpdf/QTC.hh>
#include <qpdf/QUtil.hh>
#include <cstdlib>
#include <cstring>
#include <iostream>
// This program demonstrates extraction of bookmarks using the qpdf outlines API. Note that all the
// information shown by this program can also be obtained from a PDF file using qpdf's --json
// option.
//
// Ignore calls to QTC::TC - they are for qpdf CI testing only.
static char const* whoami = nullptr;
static enum { st_none, st_numbers, st_lines } style = st_none;
static bool show_open = false;
static bool show_targets = false;
static std::map<QPDFObjGen, int> page_map;
void
usage()
{
std::cerr << "Usage: " << whoami << " [options] file.pdf [password]" << std::endl
<< "Options:" << std::endl
<< " --numbers give bookmarks outline-style numbers" << std::endl
<< " --lines draw lines to show bookmark hierarchy" << std::endl
<< " --show-open indicate whether a bookmark is initially open" << std::endl
<< " --show-targets show target if possible" << std::endl;
exit(2);
}
void
print_lines(std::vector<int>& numbers)
{
for (unsigned int i = 0; i < numbers.size() - 1; ++i) {
if (numbers.at(i)) {
std::cout << "| ";
} else {
std::cout << " ";
}
}
}
void
generate_page_map(QPDF& qpdf)
{
QPDFPageDocumentHelper dh(qpdf);
int n = 0;
for (auto const& page: dh.getAllPages()) {
page_map[page] = ++n;
}
}
void
show_bookmark_details(QPDFOutlineObjectHelper outline, std::vector<int> numbers)
{
// No default so gcc will warn on missing tag
switch (style) {
case st_none:
QTC::TC("examples", "pdf-bookmarks none");
break;
case st_numbers:
QTC::TC("examples", "pdf-bookmarks numbers");
for (auto const& number: numbers) {
std::cout << number << ".";
}
std::cout << " ";
break;
case st_lines:
QTC::TC("examples", "pdf-bookmarks lines");
print_lines(numbers);
std::cout << "|" << std::endl;
print_lines(numbers);
std::cout << "+-+ ";
break;
}
if (show_open) {
int count = outline.getCount();
if (count) {
QTC::TC("examples", "pdf-bookmarks has count");
if (count > 0) {
// hierarchy is open at this point
QTC::TC("examples", "pdf-bookmarks open");
std::cout << "(v) ";
} else {
QTC::TC("examples", "pdf-bookmarks closed");
std::cout << "(>) ";
}
} else {
QTC::TC("examples", "pdf-bookmarks no count");
std::cout << "( ) ";
}
}
if (show_targets) {
QTC::TC("examples", "pdf-bookmarks targets");
std::string target = "unknown";
QPDFObjectHandle dest_page = outline.getDestPage();
if (!dest_page.isNull()) {
QTC::TC("examples", "pdf-bookmarks dest");
if (page_map.count(dest_page)) {
target = std::to_string(page_map[dest_page]);
}
}
std::cout << "[ -> " << target << " ] ";
}
std::cout << outline.getTitle() << '\n';
}
void
extract_bookmarks(std::vector<QPDFOutlineObjectHelper> outlines, std::vector<int>& numbers)
{
// For style == st_numbers, numbers.at(n) contains the numerical label for the outline, so we
// count up from 1.
// For style == st_lines, numbers.at(n) == 0 indicates the last outline at level n, and we don't
// otherwise care what the value is, so we count up to zero.
numbers.push_back((style == st_lines) ? -QIntC::to_int(outlines.size()) : 0);
for (auto& outline: outlines) {
++(numbers.back());
show_bookmark_details(outline, numbers);
extract_bookmarks(outline.getKids(), numbers);
}
numbers.pop_back();
}
int
main(int argc, char* argv[])
{
whoami = QUtil::getWhoami(argv[0]);
if ((argc == 2) && (strcmp(argv[1], "--version") == 0)) {
std::cout << whoami << " version 1.5" << std::endl;
exit(0);
}
int arg;
for (arg = 1; arg < argc; ++arg) {
if (argv[arg][0] == '-') {
if (strcmp(argv[arg], "--numbers") == 0) {
style = st_numbers;
} else if (strcmp(argv[arg], "--lines") == 0) {
style = st_lines;
} else if (strcmp(argv[arg], "--show-open") == 0) {
show_open = true;
} else if (strcmp(argv[arg], "--show-targets") == 0) {
show_targets = true;
} else {
usage();
}
} else {
break;
}
}
if (arg >= argc) {
usage();
}
char const* filename = argv[arg++];
char const* password = "";
if (arg < argc) {
password = argv[arg++];
}
if (arg != argc) {
usage();
}
try {
QPDF qpdf;
qpdf.processFile(filename, password);
QPDFOutlineDocumentHelper odh(qpdf);
if (odh.hasOutlines()) {
std::vector<int> numbers;
if (show_targets) {
generate_page_map(qpdf);
}
extract_bookmarks(odh.getTopLevelOutlines(), numbers);
} else {
std::cout << filename << " has no bookmarks" << std::endl;
}
} catch (std::exception& e) {
std::cerr << whoami << " processing file " << filename << ": " << e.what() << std::endl;
exit(2);
}
return 0;
}