pdf-attach-file.cc
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#include <qpdf/QPDF.hh>
#include <qpdf/QUtil.hh>
#include <qpdf/QPDFWriter.hh>
#include <qpdf/QPDFEmbeddedFileDocumentHelper.hh>
#include <qpdf/QPDFFileSpecObjectHelper.hh>
#include <iostream>
#include <cstring>
//
// This example attaches a file to an input file, adds a page to the
// beginning of the file that includes a file attachment annotation,
// and writes the result to an output file. It also illustrates a
// number of new API calls that were added in qpdf 10.2.
//
static char const* whoami = 0;
static void usage(std::string const& msg)
{
std::cerr << msg << std::endl << std::endl
<< "Usage: " << whoami << " options" << std::endl
<< "Options:" << std::endl
<< " --infile infile.pdf" << std::endl
<< " --outfile outfile.pdf" << std::endl
<< " --attachment attachment" << std::endl
<< " [ --password infile-password ]" << std::endl
<< " [ --mimetype attachment mime type ]" << std::endl;
exit(2);
}
static void process(char const* infilename, char const* password,
char const* attachment, char const* mimetype,
char const* outfilename)
{
QPDF q;
q.processFile(infilename, password);
// Create an indirect object for the built-in Helvetica font. This
// uses the qpdf literal syntax introduced in qpdf 10.6.
auto f1 = q.makeIndirectObject(
"<<"
" /Type /Font"
" /Subtype /Type1"
" /Name /F1"
" /BaseFont /Helvetica"
" /Encoding /WinAnsiEncoding"
">>"_qpdf);
// Create a resources dictionary with fonts. This uses the new
// parse introduced in qpdf 10.2 that takes a QPDF* and allows
// indirect object references.
auto resources = q.makeIndirectObject(
QPDFObjectHandle::parse(
&q,
"<<"
" /Font <<"
" /F1 " + f1.unparse() +
" >>"
">>"));
// Create a file spec.
std::string key = QUtil::path_basename(attachment);
std::cout << whoami << ": attaching " << attachment << " as " << key
<< std::endl;
auto fs = QPDFFileSpecObjectHelper::createFileSpec(q, key, attachment);
if (mimetype)
{
// Get an embedded file stream and set mimetype
auto ef = QPDFEFStreamObjectHelper(fs.getEmbeddedFileStream());
ef.setSubtype(mimetype);
}
// Add the embedded file at the document level as an attachment.
auto efdh = QPDFEmbeddedFileDocumentHelper(q);
efdh.replaceEmbeddedFile(key, fs);
// Create a file attachment annotation.
// Create appearance stream for the attachment.
auto ap = QPDFObjectHandle::newStream(
&q,
"0 10 m\n"
"10 0 l\n"
"20 10 l\n"
"10 0 m\n"
"10 20 l\n"
"0 0 20 20 re\n"
"S\n");
auto apdict = ap.getDict();
apdict.replaceKey("/Resources", QPDFObjectHandle::newDictionary());
apdict.replaceKey("/Type", QPDFObjectHandle::newName("/XObject"));
apdict.replaceKey("/Subtype", QPDFObjectHandle::newName("/Form"));
apdict.replaceKey("/BBox", "[ 0 0 20 20 ]"_qpdf);
auto annot = q.makeIndirectObject(
QPDFObjectHandle::parse(
&q,
"<<"
" /AP <<"
" /N " + ap.unparse() +
" >>"
" /Contents "
+ QPDFObjectHandle::newUnicodeString(attachment).unparse() +
" /FS " + fs.getObjectHandle().unparse() +
" /NM " +
QPDFObjectHandle::newUnicodeString(attachment).unparse() +
" /Rect [ 72 700 92 720 ]"
" /Subtype /FileAttachment"
" /Type /Annot"
">>"));
// Generate contents for the page.
auto contents = QPDFObjectHandle::newStream(
&q,
"q\n"
"BT\n"
" 102 700 Td\n"
" /F1 16 Tf\n"
" (Here is an attachment.) Tj\n"
"ET\n"
"Q\n");
// Create the page object.
auto page = QPDFObjectHandle::parse(
&q,
"<<"
" /Annots [ " + annot.unparse() + " ]"
" /Contents " + contents.unparse() +
" /MediaBox [0 0 612 792]"
" /Resources " + resources.unparse() +
" /Type /Page"
">>");
// Add the page.
q.addPage(page, true);
QPDFWriter w(q, outfilename);
w.setQDFMode(true);
w.setSuppressOriginalObjectIDs(true);
w.setDeterministicID(true);
w.write();
}
int main(int argc, char* argv[])
{
whoami = QUtil::getWhoami(argv[0]);
// For libtool's sake....
if (strncmp(whoami, "lt-", 3) == 0)
{
whoami += 3;
}
char const* infilename = 0;
char const* password = 0;
char const* attachment = 0;
char const* outfilename = 0;
char const* mimetype = 0;
auto check_arg = [](char const* arg, std::string const& msg) {
if (arg == nullptr)
{
usage(msg);
}
};
for (int i = 1; i < argc; ++i)
{
char* arg = argv[i];
char* next = argv[i+1];
if (strcmp(arg, "--infile") == 0)
{
check_arg(next, "--infile takes an argument");
infilename = next;
++i;
}
else if (strcmp(arg, "--password") == 0)
{
check_arg(next, "--password takes an argument");
password = next;
++i;
}
else if (strcmp(arg, "--attachment") == 0)
{
check_arg(next, "--attachment takes an argument");
attachment = next;
++i;
}
else if (strcmp(arg, "--outfile") == 0)
{
check_arg(next, "--outfile takes an argument");
outfilename = next;
++i;
}
else if (strcmp(arg, "--mimetype") == 0)
{
check_arg(next, "--mimetype takes an argument");
mimetype = next;
++i;
}
else
{
usage("unknown argument " + std::string(arg));
}
}
if (! (infilename && attachment && outfilename))
{
usage("required arguments were not provided");
}
try
{
process(infilename, password, attachment, mimetype, outfilename);
}
catch (std::exception &e)
{
std::cerr << whoami << " exception: "
<< e.what() << std::endl;
exit(2);
}
return 0;
}