QPDFEmbeddedFileDocumentHelper.cc
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#include <qpdf/QPDFEmbeddedFileDocumentHelper.hh>
#include <qpdf/QPDFNameTreeObjectHelper.hh>
#include <qpdf/QPDFObjectHandle_private.hh>
#include <qpdf/QPDF_private.hh>
using namespace qpdf;
// File attachments are stored in the /EmbeddedFiles (name tree) key of the /Names dictionary from
// the document catalog. Each entry points to a /FileSpec, which in turn points to one more Embedded
// File Streams. Note that file specs can appear in other places as well, such as file attachment
// annotations, among others.
//
// root -> /Names -> /EmbeddedFiles = name tree
// filename -> filespec
// <<
// /Desc ()
// /EF <<
// /F x 0 R
// /UF x 0 R
// >>
// /F (name)
// /UF (name)
// /Type /Filespec
// >>
// x 0 obj
// <<
// /Type /EmbeddedFile
// /DL filesize % not in spec?
// /Params <<
// /CheckSum <md5>
// /CreationDate (D:yyyymmddhhmmss{-hh'mm'|+hh'mm'|Z})
// /ModDate (D:yyyymmddhhmmss-hh'mm')
// /Size filesize
// /Subtype /mime#2ftype
// >>
// >>
class QPDFEmbeddedFileDocumentHelper::Members
{
public:
Members() = default;
Members(Members const&) = delete;
~Members() = default;
std::unique_ptr<QPDFNameTreeObjectHelper> embedded_files;
};
QPDFEmbeddedFileDocumentHelper::QPDFEmbeddedFileDocumentHelper(QPDF& qpdf) :
QPDFDocumentHelper(qpdf),
m(std::make_shared<Members>())
{
validate();
}
QPDFEmbeddedFileDocumentHelper&
QPDFEmbeddedFileDocumentHelper::get(QPDF& qpdf)
{
return qpdf.doc().embedded_files();
}
void
QPDFEmbeddedFileDocumentHelper::validate(bool repair)
{
m->embedded_files.reset();
auto names = qpdf.getRoot().getKey("/Names");
if (names.isDictionary()) {
auto embedded_files = names.getKey("/EmbeddedFiles");
if (embedded_files.isDictionary()) {
m->embedded_files = std::make_unique<QPDFNameTreeObjectHelper>(
embedded_files,
qpdf,
[](QPDFObjectHandle const& o) -> bool { return o.isDictionary(); },
true);
m->embedded_files->validate(repair);
}
}
}
bool
QPDFEmbeddedFileDocumentHelper::hasEmbeddedFiles() const
{
return (m->embedded_files != nullptr);
}
void
QPDFEmbeddedFileDocumentHelper::initEmbeddedFiles()
{
if (hasEmbeddedFiles()) {
return;
}
auto root = qpdf.getRoot();
auto names = root.getKey("/Names");
if (!names.isDictionary()) {
names = root.replaceKeyAndGetNew("/Names", QPDFObjectHandle::newDictionary());
}
auto embedded_files = names.getKey("/EmbeddedFiles");
if (!embedded_files.isDictionary()) {
auto nth = QPDFNameTreeObjectHelper::newEmpty(qpdf);
names.replaceKey("/EmbeddedFiles", nth.getObjectHandle());
m->embedded_files = std::make_unique<QPDFNameTreeObjectHelper>(
nth, qpdf, [](QPDFObjectHandle const& o) -> bool { return o.isDictionary(); }, true);
}
}
std::shared_ptr<QPDFFileSpecObjectHelper>
QPDFEmbeddedFileDocumentHelper::getEmbeddedFile(std::string const& name)
{
std::shared_ptr<QPDFFileSpecObjectHelper> result;
if (m->embedded_files) {
auto i = m->embedded_files->find(name);
if (i != m->embedded_files->end()) {
result = std::make_shared<QPDFFileSpecObjectHelper>(i->second);
}
}
return result;
}
std::map<std::string, std::shared_ptr<QPDFFileSpecObjectHelper>>
QPDFEmbeddedFileDocumentHelper::getEmbeddedFiles()
{
std::map<std::string, std::shared_ptr<QPDFFileSpecObjectHelper>> result;
if (m->embedded_files) {
for (auto const& i: *(m->embedded_files)) {
result[i.first] = std::make_shared<QPDFFileSpecObjectHelper>(i.second);
}
}
return result;
}
void
QPDFEmbeddedFileDocumentHelper::replaceEmbeddedFile(
std::string const& name, QPDFFileSpecObjectHelper const& fs)
{
initEmbeddedFiles();
m->embedded_files->insert(name, fs.getObjectHandle());
}
bool
QPDFEmbeddedFileDocumentHelper::removeEmbeddedFile(std::string const& name)
{
if (!hasEmbeddedFiles()) {
return false;
}
auto iter = m->embedded_files->find(name);
if (iter == m->embedded_files->end()) {
return false;
}
if (iter->second.indirect()) {
qpdf.replaceObject(iter->second, Null());
}
iter.remove();
return true;
}