pdf-bookmarks.cc
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#include <iostream>
#include <string.h>
#include <stdlib.h>
#include <qpdf/QPDF.hh>
#include <qpdf/QPDFPageDocumentHelper.hh>
#include <qpdf/QPDFOutlineDocumentHelper.hh>
#include <qpdf/QUtil.hh>
#include <qpdf/QIntC.hh>
#include <qpdf/QTC.hh>
// 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 = 0;
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.getObjectHandle().getObjGen()] = ++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");
QPDFObjGen og = dest_page.getObjGen();
if (page_map.count(og))
{
target = QUtil::int_to_string(page_map[og]);
}
}
std::cout << "[ -> " << target << " ] ";
}
std::cout << outline.getTitle() << std::endl;
}
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]);
// For libtool's sake....
if (strncmp(whoami, "lt-", 3) == 0)
{
whoami += 3;
}
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;
}