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qpdf/libqpdf/QPDFJob.cc
m-holger 50d385c858
Merge pull request #1274 from m-holger/meta 
Add new commands --remove-metadata and --remove-info
2024-09-27 11:26:34 +01:00

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#include <qpdf/QPDFJob.hh>
#include <cstring>
#include <iostream>
#include <memory>
#include <qpdf/ClosedFileInputSource.hh>
#include <qpdf/FileInputSource.hh>
#include <qpdf/Pl_Count.hh>
#include <qpdf/Pl_DCT.hh>
#include <qpdf/Pl_Discard.hh>
#include <qpdf/Pl_Flate.hh>
#include <qpdf/Pl_StdioFile.hh>
#include <qpdf/Pl_String.hh>
#include <qpdf/QIntC.hh>
#include <qpdf/QPDFAcroFormDocumentHelper.hh>
#include <qpdf/QPDFCryptoProvider.hh>
#include <qpdf/QPDFEmbeddedFileDocumentHelper.hh>
#include <qpdf/QPDFExc.hh>
#include <qpdf/QPDFLogger.hh>
#include <qpdf/QPDFOutlineDocumentHelper.hh>
#include <qpdf/QPDFPageDocumentHelper.hh>
#include <qpdf/QPDFPageLabelDocumentHelper.hh>
#include <qpdf/QPDFPageObjectHelper.hh>
#include <qpdf/QPDFSystemError.hh>
#include <qpdf/QPDFUsage.hh>
#include <qpdf/QPDFWriter.hh>
#include <qpdf/QPDF_private.hh>
#include <qpdf/QTC.hh>
#include <qpdf/QUtil.hh>
#include <qpdf/auto_job_schema.hh> // JOB_SCHEMA_DATA
namespace
{
class ImageOptimizer: public QPDFObjectHandle::StreamDataProvider
{
public:
ImageOptimizer(
QPDFJob& o,
size_t oi_min_width,
size_t oi_min_height,
size_t oi_min_area,
QPDFObjectHandle& image);
~ImageOptimizer() override = default;
void provideStreamData(QPDFObjGen const&, Pipeline* pipeline) override;
std::shared_ptr<Pipeline> makePipeline(std::string const& description, Pipeline* next);
bool evaluate(std::string const& description);
private:
QPDFJob& o;
size_t oi_min_width;
size_t oi_min_height;
size_t oi_min_area;
QPDFObjectHandle image;
};
class DiscardContents: public QPDFObjectHandle::ParserCallbacks
{
public:
~DiscardContents() override = default;
void
handleObject(QPDFObjectHandle) override
{
}
void
handleEOF() override
{
}
};
struct QPDFPageData
{
QPDFPageData(std::string const& filename, QPDF* qpdf, std::string const& range);
QPDFPageData(QPDFPageData const& other, int page);
std::string filename;
QPDF* qpdf;
std::vector<QPDFObjectHandle> orig_pages;
std::vector<int> selected_pages;
};
class ProgressReporter: public QPDFWriter::ProgressReporter
{
public:
ProgressReporter(Pipeline& p, std::string const& prefix, char const* filename) :
p(p),
prefix(prefix),
filename(filename)
{
}
~ProgressReporter() override = default;
void reportProgress(int) override;
private:
Pipeline& p;
std::string prefix;
std::string filename;
};
} // namespace
ImageOptimizer::ImageOptimizer(
QPDFJob& o,
size_t oi_min_width,
size_t oi_min_height,
size_t oi_min_area,
QPDFObjectHandle& image) :
o(o),
oi_min_width(oi_min_width),
oi_min_height(oi_min_height),
oi_min_area(oi_min_area),
image(image)
{
}
std::shared_ptr<Pipeline>
ImageOptimizer::makePipeline(std::string const& description, Pipeline* next)
{
std::shared_ptr<Pipeline> result;
QPDFObjectHandle dict = image.getDict();
QPDFObjectHandle w_obj = dict.getKey("/Width");
QPDFObjectHandle h_obj = dict.getKey("/Height");
QPDFObjectHandle colorspace_obj = dict.getKey("/ColorSpace");
if (!(w_obj.isNumber() && h_obj.isNumber())) {
if (!description.empty()) {
o.doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix << ": " << description
<< ": not optimizing because image dictionary is missing required keys\n";
});
}
return result;
}
QPDFObjectHandle components_obj = dict.getKey("/BitsPerComponent");
if (!(components_obj.isInteger() && (components_obj.getIntValue() == 8))) {
QTC::TC("qpdf", "QPDFJob image optimize bits per component");
if (!description.empty()) {
o.doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix << ": " << description
<< ": not optimizing because image has other than 8 bits per component\n";
});
}
return result;
}
// Files have been seen in the wild whose width and height are floating point, which is goofy,
// but we can deal with it.
JDIMENSION w = 0;
if (w_obj.isInteger()) {
w = w_obj.getUIntValueAsUInt();
} else {
w = static_cast<JDIMENSION>(w_obj.getNumericValue());
}
JDIMENSION h = 0;
if (h_obj.isInteger()) {
h = h_obj.getUIntValueAsUInt();
} else {
h = static_cast<JDIMENSION>(h_obj.getNumericValue());
}
std::string colorspace = (colorspace_obj.isName() ? colorspace_obj.getName() : std::string());
int components = 0;
J_COLOR_SPACE cs = JCS_UNKNOWN;
if (colorspace == "/DeviceRGB") {
components = 3;
cs = JCS_RGB;
} else if (colorspace == "/DeviceGray") {
components = 1;
cs = JCS_GRAYSCALE;
} else if (colorspace == "/DeviceCMYK") {
components = 4;
cs = JCS_CMYK;
} else {
QTC::TC("qpdf", "QPDFJob image optimize colorspace");
if (!description.empty()) {
o.doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix << ": " << description
<< ": not optimizing because qpdf can't optimize images with this colorspace\n";
});
}
return result;
}
if (((this->oi_min_width > 0) && (w <= this->oi_min_width)) ||
((this->oi_min_height > 0) && (h <= this->oi_min_height)) ||
((this->oi_min_area > 0) && ((w * h) <= this->oi_min_area))) {
QTC::TC("qpdf", "QPDFJob image optimize too small");
if (!description.empty()) {
o.doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix << ": " << description
<< ": not optimizing because image is smaller than requested minimum "
"dimensions\n";
});
}
return result;
}
result = std::make_shared<Pl_DCT>("jpg", next, w, h, components, cs);
return result;
}
bool
ImageOptimizer::evaluate(std::string const& description)
{
if (!image.pipeStreamData(nullptr, 0, qpdf_dl_specialized, true)) {
QTC::TC("qpdf", "QPDFJob image optimize no pipeline");
o.doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix << ": " << description
<< ": not optimizing because unable to decode data or data already uses DCT\n";
});
return false;
}
Pl_Discard d;
Pl_Count c("count", &d);
std::shared_ptr<Pipeline> p = makePipeline(description, &c);
if (p == nullptr) {
// message issued by makePipeline
return false;
}
if (!image.pipeStreamData(p.get(), 0, qpdf_dl_specialized)) {
return false;
}
long long orig_length = image.getDict().getKey("/Length").getIntValue();
if (c.getCount() >= orig_length) {
QTC::TC("qpdf", "QPDFJob image optimize no shrink");
o.doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix << ": " << description
<< ": not optimizing because DCT compression does not reduce image size\n";
});
return false;
}
o.doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix << ": " << description << ": optimizing image reduces size from " << orig_length
<< " to " << c.getCount() << "\n";
});
return true;
}
void
ImageOptimizer::provideStreamData(QPDFObjGen const&, Pipeline* pipeline)
{
std::shared_ptr<Pipeline> p = makePipeline("", pipeline);
if (p == nullptr) {
// Should not be possible
image.warnIfPossible(
"unable to create pipeline after previous success; image data will be lost");
pipeline->finish();
return;
}
image.pipeStreamData(p.get(), 0, qpdf_dl_specialized, false, false);
}
QPDFJob::PageSpec::PageSpec(
std::string const& filename, char const* password, std::string const& range) :
filename(filename),
range(range)
{
if (password) {
this->password = QUtil::make_shared_cstr(password);
}
}
QPDFPageData::QPDFPageData(std::string const& filename, QPDF* qpdf, std::string const& range) :
filename(filename),
qpdf(qpdf),
orig_pages(qpdf->getAllPages())
{
try {
this->selected_pages =
QUtil::parse_numrange(range.c_str(), QIntC::to_int(this->orig_pages.size()));
} catch (std::runtime_error& e) {
throw std::runtime_error("parsing numeric range for " + filename + ": " + e.what());
}
}
QPDFPageData::QPDFPageData(QPDFPageData const& other, int page) :
filename(other.filename),
qpdf(other.qpdf),
orig_pages(other.orig_pages)
{
this->selected_pages.push_back(page);
}
void
ProgressReporter::reportProgress(int percentage)
{
this->p << prefix << ": " << filename << ": write progress: " << percentage << "%\n";
}
QPDFJob::Members::Members() :
log(QPDFLogger::defaultLogger())
{
}
QPDFJob::QPDFJob() :
m(new Members())
{
}
void
QPDFJob::usage(std::string const& msg)
{
throw QPDFUsage(msg);
}
void
QPDFJob::setMessagePrefix(std::string const& message_prefix)
{
m->message_prefix = message_prefix;
}
std::string
QPDFJob::getMessagePrefix() const
{
return m->message_prefix;
}
std::shared_ptr<QPDFLogger>
QPDFJob::getLogger()
{
return m->log;
}
void
QPDFJob::setLogger(std::shared_ptr<QPDFLogger> l)
{
m->log = l;
}
void
QPDFJob::setOutputStreams(std::ostream* out, std::ostream* err)
{
setLogger(QPDFLogger::create());
m->log->setOutputStreams(out, err);
}
void
QPDFJob::registerProgressReporter(std::function<void(int)> handler)
{
m->progress_handler = handler;
}
void
QPDFJob::doIfVerbose(std::function<void(Pipeline&, std::string const& prefix)> fn)
{
if (m->verbose) {
fn(*m->log->getInfo(), m->message_prefix);
}
}
std::shared_ptr<QPDFJob::Config>
QPDFJob::config()
{
return std::shared_ptr<Config>(new Config(*this));
}
std::string
QPDFJob::job_json_schema_v1()
{
return job_json_schema(1);
}
std::string
QPDFJob::job_json_schema(int version)
{
if (version != LATEST_JOB_JSON) {
throw std::runtime_error("job_json_schema: version must be 1");
}
return JOB_SCHEMA_DATA;
}
void
QPDFJob::parseRotationParameter(std::string const& parameter)
{
std::string angle_str;
std::string range;
size_t colon = parameter.find(':');
int relative = 0;
if (colon != std::string::npos) {
if (colon > 0) {
angle_str = parameter.substr(0, colon);
}
if (colon + 1 < parameter.length()) {
range = parameter.substr(colon + 1);
}
} else {
angle_str = parameter;
}
if (angle_str.length() > 0) {
char first = angle_str.at(0);
if ((first == '+') || (first == '-')) {
relative = ((first == '+') ? 1 : -1);
angle_str = angle_str.substr(1);
} else if (!QUtil::is_digit(angle_str.at(0))) {
angle_str = "";
}
}
if (range.empty()) {
range = "1-z";
}
bool range_valid = false;
try {
QUtil::parse_numrange(range.c_str(), 0);
range_valid = true;
} catch (std::runtime_error const&) {
// ignore
}
if (range_valid &&
((angle_str == "0") || (angle_str == "90") || (angle_str == "180") ||
(angle_str == "270"))) {
int angle = QUtil::string_to_int(angle_str.c_str());
if (relative == -1) {
angle = -angle;
}
m->rotations[range] = RotationSpec(angle, (relative != 0));
} else {
usage("invalid parameter to rotate: " + parameter);
}
}
std::vector<int>
QPDFJob::parseNumrange(char const* range, int max)
{
try {
return QUtil::parse_numrange(range, max);
} catch (std::runtime_error& e) {
usage(e.what());
}
return {};
}
std::unique_ptr<QPDF>
QPDFJob::createQPDF()
{
checkConfiguration();
std::unique_ptr<QPDF> pdf_sp;
try {
processFile(pdf_sp, m->infilename.get(), m->password.get(), true, true);
} catch (QPDFExc& e) {
if (e.getErrorCode() == qpdf_e_password) {
// Allow certain operations to work when an incorrect password is supplied.
if (m->check_is_encrypted || m->check_requires_password) {
m->encryption_status = qpdf_es_encrypted | qpdf_es_password_incorrect;
return nullptr;
}
if (m->show_encryption && pdf_sp) {
m->log->info("Incorrect password supplied\n");
showEncryption(*pdf_sp);
return nullptr;
}
}
throw;
}
QPDF& pdf = *pdf_sp;
if (pdf.isEncrypted()) {
m->encryption_status = qpdf_es_encrypted;
}
if (m->check_is_encrypted || m->check_requires_password) {
return nullptr;
}
// If we are updating from JSON, this has to be done first before other options may cause
// transformations to the input.
if (!m->update_from_json.empty()) {
pdf.updateFromJSON(m->update_from_json);
}
std::vector<std::unique_ptr<QPDF>> page_heap;
if (!m->page_specs.empty()) {
handlePageSpecs(pdf, page_heap);
}
if (!m->rotations.empty()) {
handleRotations(pdf);
}
handleUnderOverlay(pdf);
handleTransformations(pdf);
if (m->remove_info) {
auto trailer = pdf.getTrailer();
auto mod_date = trailer.getKey("/Info").getKeyIfDict("/ModDate");
if (mod_date.isNull()) {
trailer.removeKey("/Info");
} else {
auto info = trailer.replaceKeyAndGetNew(
"/Info", pdf.makeIndirectObject(QPDFObjectHandle::newDictionary()));
info.replaceKey("/ModDate", mod_date);
}
pdf.getRoot().removeKey("/Metadata");
}
if (m->remove_metadata) {
pdf.getRoot().removeKey("/Metadata");
}
for (auto& foreign: page_heap) {
if (foreign->anyWarnings()) {
m->warnings = true;
}
}
return pdf_sp;
}
void
QPDFJob::writeQPDF(QPDF& pdf)
{
if (!createsOutput()) {
doInspection(pdf);
} else if (m->split_pages) {
doSplitPages(pdf);
} else {
writeOutfile(pdf);
}
if (!pdf.getWarnings().empty()) {
m->warnings = true;
}
if (m->warnings && (!m->suppress_warnings)) {
if (createsOutput()) {
*m->log->getWarn()
<< m->message_prefix
<< ": operation succeeded with warnings; resulting file may have some problems\n";
} else {
*m->log->getWarn() << m->message_prefix << ": operation succeeded with warnings\n";
}
}
if (m->report_mem_usage) {
// Call get_max_memory_usage before generating output. When debugging, it's easier if print
// statements from get_max_memory_usage are not interleaved with the output.
auto mem_usage = QUtil::get_max_memory_usage();
*m->log->getWarn() << "qpdf-max-memory-usage " << mem_usage << "\n";
}
}
void
QPDFJob::run()
{
auto pdf = createQPDF();
if (pdf) {
writeQPDF(*pdf);
}
}
bool
QPDFJob::hasWarnings() const
{
return m->warnings;
}
bool
QPDFJob::createsOutput() const
{
return ((m->outfilename != nullptr) || m->replace_input);
}
int
QPDFJob::getExitCode() const
{
if (m->check_is_encrypted) {
if (m->encryption_status & qpdf_es_encrypted) {
QTC::TC("qpdf", "QPDFJob check encrypted encrypted");
return 0;
} else {
QTC::TC("qpdf", "QPDFJob check encrypted not encrypted");
return EXIT_IS_NOT_ENCRYPTED;
}
} else if (m->check_requires_password) {
if (m->encryption_status & qpdf_es_encrypted) {
if (m->encryption_status & qpdf_es_password_incorrect) {
QTC::TC("qpdf", "QPDFJob check password password incorrect");
return 0;
} else {
QTC::TC("qpdf", "QPDFJob check password password correct");
return EXIT_CORRECT_PASSWORD;
}
} else {
QTC::TC("qpdf", "QPDFJob check password not encrypted");
return EXIT_IS_NOT_ENCRYPTED;
}
}
if (m->warnings && (!m->warnings_exit_zero)) {
return EXIT_WARNING;
}
return 0;
}
void
QPDFJob::checkConfiguration()
{
// Do final checks for command-line consistency. (I always think this is called doFinalChecks,
// so I'm putting that in a comment.)
if (m->replace_input) {
// Check for --empty appears later after we have checked m->infilename.
if (m->outfilename) {
usage("--replace-input may not be used when an output file is specified");
} else if (m->split_pages) {
usage("--split-pages may not be used with --replace-input");
} else if (m->json_version) {
usage("--json may not be used with --replace-input");
}
}
if (m->json_version && (m->outfilename == nullptr)) {
// The output file is optional with --json for backward compatibility and defaults to
// standard output.
m->outfilename = QUtil::make_shared_cstr("-");
}
if (m->infilename == nullptr) {
usage("an input file name is required");
} else if (m->replace_input && (strlen(m->infilename.get()) == 0)) {
usage("--replace-input may not be used with --empty");
} else if (m->require_outfile && (m->outfilename == nullptr) && (!m->replace_input)) {
usage("an output file name is required; use - for standard output");
} else if ((!m->require_outfile) && ((m->outfilename != nullptr) || m->replace_input)) {
usage("no output file may be given for this option");
}
if (m->check_requires_password && m->check_is_encrypted) {
usage("--requires-password and --is-encrypted may not be given"
" together");
}
if (m->encrypt && (!m->allow_insecure) &&
(m->owner_password.empty() && (!m->user_password.empty()) && (m->keylen == 256))) {
// Note that empty owner passwords for R < 5 are copied from the user password, so this lack
// of security is not an issue for those files. Also we are consider only the ability to
// open the file without a password to be insecure. We are not concerned about whether the
// viewer enforces security settings when the user and owner password match.
usage(
"A PDF with a non-empty user password and an empty owner password encrypted with a "
"256-bit key is insecure as it can be opened without a password. If you really want to"
" do this, you must also give the --allow-insecure option before the -- that follows "
"--encrypt.");
}
bool save_to_stdout = false;
if (m->require_outfile && m->outfilename && (strcmp(m->outfilename.get(), "-") == 0)) {
if (m->split_pages) {
usage("--split-pages may not be used when writing to standard output");
}
save_to_stdout = true;
}
if (!m->attachment_to_show.empty()) {
save_to_stdout = true;
}
if (save_to_stdout) {
m->log->saveToStandardOutput(true);
}
if ((!m->split_pages) && QUtil::same_file(m->infilename.get(), m->outfilename.get())) {
QTC::TC("qpdf", "QPDFJob same file error");
usage("input file and output file are the same; use --replace-input to intentionally "
"overwrite the input file");
}
if (m->json_version == 1) {
if (m->json_keys.count("qpdf")) {
usage("json key \"qpdf\" is only valid for json version > 1");
}
} else {
if (m->json_keys.count("objectinfo") || m->json_keys.count("objects")) {
usage("json keys \"objects\" and \"objectinfo\" are only valid for json version 1");
}
}
}
unsigned long
QPDFJob::getEncryptionStatus()
{
return m->encryption_status;
}
void
QPDFJob::setQPDFOptions(QPDF& pdf)
{
pdf.setLogger(m->log);
if (m->ignore_xref_streams) {
pdf.setIgnoreXRefStreams(true);
}
if (m->suppress_recovery) {
pdf.setAttemptRecovery(false);
}
if (m->password_is_hex_key) {
pdf.setPasswordIsHexKey(true);
}
if (m->suppress_warnings) {
pdf.setSuppressWarnings(true);
}
}
static std::string
show_bool(bool v)
{
return v ? "allowed" : "not allowed";
}
static std::string
show_encryption_method(QPDF::encryption_method_e method)
{
std::string result = "unknown";
switch (method) {
case QPDF::e_none:
result = "none";
break;
case QPDF::e_unknown:
result = "unknown";
break;
case QPDF::e_rc4:
result = "RC4";
break;
case QPDF::e_aes:
result = "AESv2";
break;
case QPDF::e_aesv3:
result = "AESv3";
break;
// no default so gcc will warn for missing case
}
return result;
}
void
QPDFJob::showEncryption(QPDF& pdf)
{
// Extract /P from /Encrypt
int R = 0;
int P = 0;
int V = 0;
QPDF::encryption_method_e stream_method = QPDF::e_unknown;
QPDF::encryption_method_e string_method = QPDF::e_unknown;
QPDF::encryption_method_e file_method = QPDF::e_unknown;
auto& cout = *m->log->getInfo();
if (!pdf.isEncrypted(R, P, V, stream_method, string_method, file_method)) {
cout << "File is not encrypted\n";
} else {
cout << "R = " << R << "\n";
cout << "P = " << P << "\n";
std::string user_password = pdf.getTrimmedUserPassword();
std::string encryption_key = pdf.getEncryptionKey();
cout << "User password = " << user_password << "\n";
if (m->show_encryption_key) {
cout << "Encryption key = " << QUtil::hex_encode(encryption_key) << "\n";
}
if (pdf.ownerPasswordMatched()) {
cout << "Supplied password is owner password\n";
}
if (pdf.userPasswordMatched()) {
cout << "Supplied password is user password\n";
}
cout << "extract for accessibility: " << show_bool(pdf.allowAccessibility()) << "\n"
<< "extract for any purpose: " << show_bool(pdf.allowExtractAll()) << "\n"
<< "print low resolution: " << show_bool(pdf.allowPrintLowRes()) << "\n"
<< "print high resolution: " << show_bool(pdf.allowPrintHighRes()) << "\n"
<< "modify document assembly: " << show_bool(pdf.allowModifyAssembly()) << "\n"
<< "modify forms: " << show_bool(pdf.allowModifyForm()) << "\n"
<< "modify annotations: " << show_bool(pdf.allowModifyAnnotation()) << "\n"
<< "modify other: " << show_bool(pdf.allowModifyOther()) << "\n"
<< "modify anything: " << show_bool(pdf.allowModifyAll()) << "\n";
if (V >= 4) {
cout << "stream encryption method: " << show_encryption_method(stream_method) << "\n"
<< "string encryption method: " << show_encryption_method(string_method) << "\n"
<< "file encryption method: " << show_encryption_method(file_method) << "\n";
}
}
}
void
QPDFJob::doCheck(QPDF& pdf)
{
// Code below may set okay to false but not to true. We assume okay until we prove otherwise but
// may continue to perform additional checks after finding errors.
bool okay = true;
auto& cout = *m->log->getInfo();
cout << "checking " << m->infilename.get() << "\n";
QPDF::JobSetter::setCheckMode(pdf, true);
try {
int extension_level = pdf.getExtensionLevel();
cout << "PDF Version: " << pdf.getPDFVersion();
if (extension_level > 0) {
cout << " extension level " << pdf.getExtensionLevel();
}
cout << "\n";
showEncryption(pdf);
if (pdf.isLinearized()) {
cout << "File is linearized\n";
pdf.checkLinearization();
} else {
cout << "File is not linearized\n";
}
// Write the file to nowhere, uncompressing streams. This causes full file traversal and
// decoding of all streams we can decode.
QPDFWriter w(pdf);
Pl_Discard discard;
w.setOutputPipeline(&discard);
w.setDecodeLevel(qpdf_dl_all);
w.write();
// Parse all content streams
DiscardContents discard_contents;
int pageno = 0;
for (auto& page: QPDFPageDocumentHelper(pdf).getAllPages()) {
++pageno;
try {
page.parseContents(&discard_contents);
} catch (QPDFExc& e) {
okay = false;
*m->log->getError() << "ERROR: page " << pageno << ": " << e.what() << "\n";
}
}
} catch (std::exception& e) {
*m->log->getError() << "ERROR: " << e.what() << "\n";
okay = false;
}
if (!okay) {
throw std::runtime_error("errors detected");
}
if (!pdf.getWarnings().empty()) {
m->warnings = true;
} else {
*m->log->getInfo()
<< "No syntax or stream encoding errors found; the file may still contain\n"
<< "errors that qpdf cannot detect\n";
}
}
void
QPDFJob::doShowObj(QPDF& pdf)
{
QPDFObjectHandle obj;
if (m->show_trailer) {
obj = pdf.getTrailer();
} else {
obj = pdf.getObjectByID(m->show_obj, m->show_gen);
}
bool error = false;
if (obj.isStream()) {
if (m->show_raw_stream_data || m->show_filtered_stream_data) {
bool filter = m->show_filtered_stream_data;
if (filter && (!obj.pipeStreamData(nullptr, 0, qpdf_dl_all))) {
QTC::TC("qpdf", "QPDFJob unable to filter");
obj.warnIfPossible("unable to filter stream data");
error = true;
} else {
// If anything has been written to standard output, this will fail.
m->log->saveToStandardOutput(true);
obj.pipeStreamData(
m->log->getSave().get(),
(filter && m->normalize) ? qpdf_ef_normalize : 0,
filter ? qpdf_dl_all : qpdf_dl_none);
}
} else {
*m->log->getInfo() << "Object is stream. Dictionary:\n"
<< obj.getDict().unparseResolved() << "\n";
}
} else {
*m->log->getInfo() << obj.unparseResolved() << "\n";
}
if (error) {
throw std::runtime_error("unable to get object " + obj.getObjGen().unparse(','));
}
}
void
QPDFJob::doShowPages(QPDF& pdf)
{
int pageno = 0;
auto& cout = *m->log->getInfo();
for (auto& ph: QPDFPageDocumentHelper(pdf).getAllPages()) {
QPDFObjectHandle page = ph.getObjectHandle();
++pageno;
cout << "page " << pageno << ": " << page.getObjectID() << " " << page.getGeneration()
<< " R\n";
if (m->show_page_images) {
std::map<std::string, QPDFObjectHandle> images = ph.getImages();
if (!images.empty()) {
cout << " images:\n";
for (auto const& iter2: images) {
std::string const& name = iter2.first;
QPDFObjectHandle image = iter2.second;
QPDFObjectHandle dict = image.getDict();
int width = dict.getKey("/Width").getIntValueAsInt();
int height = dict.getKey("/Height").getIntValueAsInt();
cout << " " << name << ": " << image.unparse() << ", " << width << " x "
<< height << "\n";
}
}
}
cout << " content:\n";
for (auto& iter2: ph.getPageContents()) {
cout << " " << iter2.unparse() << "\n";
}
}
}
void
QPDFJob::doListAttachments(QPDF& pdf)
{
QPDFEmbeddedFileDocumentHelper efdh(pdf);
if (efdh.hasEmbeddedFiles()) {
for (auto const& i: efdh.getEmbeddedFiles()) {
std::string const& key = i.first;
auto efoh = i.second;
*m->log->getInfo() << key << " -> "
<< efoh->getEmbeddedFileStream().getObjGen().unparse(',') << "\n";
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
auto desc = efoh->getDescription();
if (!desc.empty()) {
v << " description: " << desc << "\n";
}
v << " preferred name: " << efoh->getFilename() << "\n";
v << " all names:\n";
for (auto const& i2: efoh->getFilenames()) {
v << " " << i2.first << " -> " << i2.second << "\n";
}
v << " all data streams:\n";
for (auto const& i2: efoh->getEmbeddedFileStreams().ditems()) {
auto efs = QPDFEFStreamObjectHelper(i2.second);
v << " " << i2.first << " -> "
<< efs.getObjectHandle().getObjGen().unparse(',') << "\n";
v << " creation date: " << efs.getCreationDate() << "\n"
<< " modification date: " << efs.getModDate() << "\n"
<< " mime type: " << efs.getSubtype() << "\n"
<< " checksum: " << QUtil::hex_encode(efs.getChecksum()) << "\n";
}
});
}
} else {
*m->log->getInfo() << m->infilename.get() << " has no embedded files\n";
}
}
void
QPDFJob::doShowAttachment(QPDF& pdf)
{
QPDFEmbeddedFileDocumentHelper efdh(pdf);
auto fs = efdh.getEmbeddedFile(m->attachment_to_show);
if (!fs) {
throw std::runtime_error("attachment " + m->attachment_to_show + " not found");
}
auto efs = fs->getEmbeddedFileStream();
// saveToStandardOutput has already been called, but it's harmless to call it again, so do as
// defensive coding.
m->log->saveToStandardOutput(true);
efs.pipeStreamData(m->log->getSave().get(), 0, qpdf_dl_all);
}
void
QPDFJob::parse_object_id(std::string const& objspec, bool& trailer, int& obj, int& gen)
{
if (objspec == "trailer") {
trailer = true;
} else {
trailer = false;
obj = QUtil::string_to_int(objspec.c_str());
size_t comma = objspec.find(',');
if ((comma != std::string::npos) && (comma + 1 < objspec.length())) {
gen = QUtil::string_to_int(objspec.substr(1 + comma, std::string::npos).c_str());
}
}
}
QPDFObjGen::set
QPDFJob::getWantedJSONObjects()
{
QPDFObjGen::set wanted_og;
for (auto const& iter: m->json_objects) {
bool trailer;
int obj = 0;
int gen = 0;
parse_object_id(iter, trailer, obj, gen);
wanted_og.add(QPDFObjGen(obj, gen));
}
return wanted_og;
}
void
QPDFJob::doJSONObjects(Pipeline* p, bool& first, QPDF& pdf)
{
if (m->json_version == 1) {
JSON::writeDictionaryKey(p, first, "objects", 1);
bool first_object = true;
JSON::writeDictionaryOpen(p, first_object, 1);
bool all_objects = m->json_objects.empty();
auto wanted_og = getWantedJSONObjects();
for (auto& obj: pdf.getAllObjects()) {
std::string key = obj.unparse();
if (all_objects || wanted_og.count(obj.getObjGen())) {
JSON::writeDictionaryKey(p, first_object, obj.unparse(), 2);
obj.writeJSON(1, p, true, 2);
first_object = false;
}
}
if (all_objects || m->json_objects.count("trailer")) {
JSON::writeDictionaryKey(p, first_object, "trailer", 2);
pdf.getTrailer().writeJSON(1, p, true, 2);
first_object = false;
}
JSON::writeDictionaryClose(p, first_object, 1);
} else {
std::set<std::string> json_objects;
if (m->json_objects.count("trailer")) {
json_objects.insert("trailer");
}
for (auto og: getWantedJSONObjects()) {
json_objects.emplace("obj:" + og.unparse(' ') + " R");
}
pdf.writeJSON(
m->json_version,
p,
false,
first,
m->decode_level,
m->json_stream_data,
m->json_stream_prefix,
json_objects);
}
}
void
QPDFJob::doJSONObjectinfo(Pipeline* p, bool& first, QPDF& pdf)
{
JSON::writeDictionaryKey(p, first, "objectinfo", 1);
bool first_object = true;
JSON::writeDictionaryOpen(p, first_object, 1);
bool all_objects = m->json_objects.empty();
auto wanted_og = getWantedJSONObjects();
for (auto& obj: pdf.getAllObjects()) {
if (all_objects || wanted_og.count(obj.getObjGen())) {
auto j_details = JSON::makeDictionary();
auto j_stream = j_details.addDictionaryMember("stream", JSON::makeDictionary());
bool is_stream = obj.isStream();
j_stream.addDictionaryMember("is", JSON::makeBool(is_stream));
j_stream.addDictionaryMember(
"length",
(is_stream ? obj.getDict().getKey("/Length").getJSON(m->json_version, true)
: JSON::makeNull()));
j_stream.addDictionaryMember(
"filter",
(is_stream ? obj.getDict().getKey("/Filter").getJSON(m->json_version, true)
: JSON::makeNull()));
JSON::writeDictionaryItem(p, first_object, obj.unparse(), j_details, 2);
}
}
JSON::writeDictionaryClose(p, first_object, 1);
}
void
QPDFJob::doJSONPages(Pipeline* p, bool& first, QPDF& pdf)
{
JSON::writeDictionaryKey(p, first, "pages", 1);
bool first_page = true;
JSON::writeArrayOpen(p, first_page, 2);
QPDFPageLabelDocumentHelper pldh(pdf);
QPDFOutlineDocumentHelper odh(pdf);
int pageno = -1;
for (auto& ph: QPDFPageDocumentHelper(pdf).getAllPages()) {
++pageno;
JSON j_page = JSON::makeDictionary();
QPDFObjectHandle page = ph.getObjectHandle();
j_page.addDictionaryMember("object", page.getJSON(m->json_version));
JSON j_images = j_page.addDictionaryMember("images", JSON::makeArray());
for (auto const& iter2: ph.getImages()) {
JSON j_image = j_images.addArrayElement(JSON::makeDictionary());
j_image.addDictionaryMember("name", JSON::makeString(iter2.first));
QPDFObjectHandle image = iter2.second;
QPDFObjectHandle dict = image.getDict();
j_image.addDictionaryMember("object", image.getJSON(m->json_version));
j_image.addDictionaryMember("width", dict.getKey("/Width").getJSON(m->json_version));
j_image.addDictionaryMember("height", dict.getKey("/Height").getJSON(m->json_version));
j_image.addDictionaryMember(
"colorspace", dict.getKey("/ColorSpace").getJSON(m->json_version));
j_image.addDictionaryMember(
"bitspercomponent", dict.getKey("/BitsPerComponent").getJSON(m->json_version));
QPDFObjectHandle filters = dict.getKey("/Filter").wrapInArray();
j_image.addDictionaryMember("filter", filters.getJSON(m->json_version));
QPDFObjectHandle decode_parms = dict.getKey("/DecodeParms");
QPDFObjectHandle dp_array;
if (decode_parms.isArray()) {
dp_array = decode_parms;
} else {
dp_array = QPDFObjectHandle::newArray();
for (int i = 0; i < filters.getArrayNItems(); ++i) {
dp_array.appendItem(decode_parms);
}
}
j_image.addDictionaryMember("decodeparms", dp_array.getJSON(m->json_version));
j_image.addDictionaryMember(
"filterable",
JSON::makeBool(image.pipeStreamData(nullptr, 0, m->decode_level, true)));
}
j_page.addDictionaryMember("images", j_images);
JSON j_contents = j_page.addDictionaryMember("contents", JSON::makeArray());
for (auto& iter2: ph.getPageContents()) {
j_contents.addArrayElement(iter2.getJSON(m->json_version));
}
j_page.addDictionaryMember("label", pldh.getLabelForPage(pageno).getJSON(m->json_version));
JSON j_outlines = j_page.addDictionaryMember("outlines", JSON::makeArray());
std::vector<QPDFOutlineObjectHelper> outlines = odh.getOutlinesForPage(page.getObjGen());
for (auto& oiter: outlines) {
JSON j_outline = j_outlines.addArrayElement(JSON::makeDictionary());
j_outline.addDictionaryMember(
"object", oiter.getObjectHandle().getJSON(m->json_version));
j_outline.addDictionaryMember("title", JSON::makeString(oiter.getTitle()));
j_outline.addDictionaryMember("dest", oiter.getDest().getJSON(m->json_version, true));
}
j_page.addDictionaryMember("pageposfrom1", JSON::makeInt(1 + pageno));
JSON::writeArrayItem(p, first_page, j_page, 2);
}
JSON::writeArrayClose(p, first_page, 1);
}
void
QPDFJob::doJSONPageLabels(Pipeline* p, bool& first, QPDF& pdf)
{
JSON j_labels = JSON::makeArray();
QPDFPageLabelDocumentHelper pldh(pdf);
long long npages = QIntC::to_longlong(QPDFPageDocumentHelper(pdf).getAllPages().size());
if (pldh.hasPageLabels()) {
std::vector<QPDFObjectHandle> labels;
pldh.getLabelsForPageRange(0, npages - 1, 0, labels);
for (auto iter = labels.begin(); iter != labels.end(); ++iter) {
if ((iter + 1) == labels.end()) {
// This can't happen, so ignore it. This could only happen if getLabelsForPageRange
// somehow returned an odd number of items.
break;
}
JSON j_label = j_labels.addArrayElement(JSON::makeDictionary());
j_label.addDictionaryMember("index", (*iter).getJSON(m->json_version));
++iter;
j_label.addDictionaryMember("label", (*iter).getJSON(m->json_version));
}
}
JSON::writeDictionaryItem(p, first, "pagelabels", j_labels, 1);
}
void
QPDFJob::addOutlinesToJson(
std::vector<QPDFOutlineObjectHelper> outlines, JSON& j, std::map<QPDFObjGen, int>& page_numbers)
{
for (auto& ol: outlines) {
JSON jo = j.addArrayElement(JSON::makeDictionary());
jo.addDictionaryMember("object", ol.getObjectHandle().getJSON(m->json_version));
jo.addDictionaryMember("title", JSON::makeString(ol.getTitle()));
jo.addDictionaryMember("dest", ol.getDest().getJSON(m->json_version, true));
jo.addDictionaryMember("open", JSON::makeBool(ol.getCount() >= 0));
QPDFObjectHandle page = ol.getDestPage();
JSON j_destpage = JSON::makeNull();
if (page.isIndirect()) {
QPDFObjGen og = page.getObjGen();
if (page_numbers.count(og)) {
j_destpage = JSON::makeInt(page_numbers[og]);
}
}
jo.addDictionaryMember("destpageposfrom1", j_destpage);
JSON j_kids = jo.addDictionaryMember("kids", JSON::makeArray());
addOutlinesToJson(ol.getKids(), j_kids, page_numbers);
}
}
void
QPDFJob::doJSONOutlines(Pipeline* p, bool& first, QPDF& pdf)
{
std::map<QPDFObjGen, int> page_numbers;
int n = 0;
for (auto const& ph: QPDFPageDocumentHelper(pdf).getAllPages()) {
QPDFObjectHandle oh = ph.getObjectHandle();
page_numbers[oh.getObjGen()] = ++n;
}
JSON j_outlines = JSON::makeArray();
QPDFOutlineDocumentHelper odh(pdf);
addOutlinesToJson(odh.getTopLevelOutlines(), j_outlines, page_numbers);
JSON::writeDictionaryItem(p, first, "outlines", j_outlines, 1);
}
void
QPDFJob::doJSONAcroform(Pipeline* p, bool& first, QPDF& pdf)
{
JSON j_acroform = JSON::makeDictionary();
QPDFAcroFormDocumentHelper afdh(pdf);
j_acroform.addDictionaryMember("hasacroform", JSON::makeBool(afdh.hasAcroForm()));
j_acroform.addDictionaryMember("needappearances", JSON::makeBool(afdh.getNeedAppearances()));
JSON j_fields = j_acroform.addDictionaryMember("fields", JSON::makeArray());
int pagepos1 = 0;
for (auto const& page: QPDFPageDocumentHelper(pdf).getAllPages()) {
++pagepos1;
for (auto& aoh: afdh.getWidgetAnnotationsForPage(page)) {
QPDFFormFieldObjectHelper ffh = afdh.getFieldForAnnotation(aoh);
if (!ffh.getObjectHandle().isDictionary()) {
continue;
}
JSON j_field = j_fields.addArrayElement(JSON::makeDictionary());
j_field.addDictionaryMember("object", ffh.getObjectHandle().getJSON(m->json_version));
j_field.addDictionaryMember(
"parent", ffh.getObjectHandle().getKey("/Parent").getJSON(m->json_version));
j_field.addDictionaryMember("pageposfrom1", JSON::makeInt(pagepos1));
j_field.addDictionaryMember("fieldtype", JSON::makeString(ffh.getFieldType()));
j_field.addDictionaryMember("fieldflags", JSON::makeInt(ffh.getFlags()));
j_field.addDictionaryMember("fullname", JSON::makeString(ffh.getFullyQualifiedName()));
j_field.addDictionaryMember("partialname", JSON::makeString(ffh.getPartialName()));
j_field.addDictionaryMember(
"alternativename", JSON::makeString(ffh.getAlternativeName()));
j_field.addDictionaryMember("mappingname", JSON::makeString(ffh.getMappingName()));
j_field.addDictionaryMember("value", ffh.getValue().getJSON(m->json_version));
j_field.addDictionaryMember(
"defaultvalue", ffh.getDefaultValue().getJSON(m->json_version));
j_field.addDictionaryMember("quadding", JSON::makeInt(ffh.getQuadding()));
j_field.addDictionaryMember("ischeckbox", JSON::makeBool(ffh.isCheckbox()));
j_field.addDictionaryMember("isradiobutton", JSON::makeBool(ffh.isRadioButton()));
j_field.addDictionaryMember("ischoice", JSON::makeBool(ffh.isChoice()));
j_field.addDictionaryMember("istext", JSON::makeBool(ffh.isText()));
JSON j_choices = j_field.addDictionaryMember("choices", JSON::makeArray());
for (auto const& choice: ffh.getChoices()) {
j_choices.addArrayElement(JSON::makeString(choice));
}
JSON j_annot = j_field.addDictionaryMember("annotation", JSON::makeDictionary());
j_annot.addDictionaryMember("object", aoh.getObjectHandle().getJSON(m->json_version));
j_annot.addDictionaryMember(
"appearancestate", JSON::makeString(aoh.getAppearanceState()));
j_annot.addDictionaryMember("annotationflags", JSON::makeInt(aoh.getFlags()));
}
}
JSON::writeDictionaryItem(p, first, "acroform", j_acroform, 1);
}
void
QPDFJob::doJSONEncrypt(Pipeline* p, bool& first, QPDF& pdf)
{
int R = 0;
int P = 0;
int V = 0;
QPDF::encryption_method_e stream_method = QPDF::e_none;
QPDF::encryption_method_e string_method = QPDF::e_none;
QPDF::encryption_method_e file_method = QPDF::e_none;
bool is_encrypted = pdf.isEncrypted(R, P, V, stream_method, string_method, file_method);
JSON j_encrypt = JSON::makeDictionary();
j_encrypt.addDictionaryMember("encrypted", JSON::makeBool(is_encrypted));
j_encrypt.addDictionaryMember(
"userpasswordmatched", JSON::makeBool(is_encrypted && pdf.userPasswordMatched()));
j_encrypt.addDictionaryMember(
"ownerpasswordmatched", JSON::makeBool(is_encrypted && pdf.ownerPasswordMatched()));
if (is_encrypted && (V < 5) && pdf.ownerPasswordMatched() && (!pdf.userPasswordMatched())) {
std::string user_password = pdf.getTrimmedUserPassword();
j_encrypt.addDictionaryMember("recovereduserpassword", JSON::makeString(user_password));
} else {
j_encrypt.addDictionaryMember("recovereduserpassword", JSON::makeNull());
}
JSON j_capabilities = j_encrypt.addDictionaryMember("capabilities", JSON::makeDictionary());
j_capabilities.addDictionaryMember("accessibility", JSON::makeBool(pdf.allowAccessibility()));
j_capabilities.addDictionaryMember("extract", JSON::makeBool(pdf.allowExtractAll()));
j_capabilities.addDictionaryMember("printlow", JSON::makeBool(pdf.allowPrintLowRes()));
j_capabilities.addDictionaryMember("printhigh", JSON::makeBool(pdf.allowPrintHighRes()));
j_capabilities.addDictionaryMember("modifyassembly", JSON::makeBool(pdf.allowModifyAssembly()));
j_capabilities.addDictionaryMember("modifyforms", JSON::makeBool(pdf.allowModifyForm()));
/* cSpell:ignore moddifyannotations */
std::string MODIFY_ANNOTATIONS =
(m->json_version == 1 ? "moddifyannotations" : "modifyannotations");
j_capabilities.addDictionaryMember(
MODIFY_ANNOTATIONS, JSON::makeBool(pdf.allowModifyAnnotation()));
j_capabilities.addDictionaryMember("modifyother", JSON::makeBool(pdf.allowModifyOther()));
j_capabilities.addDictionaryMember("modify", JSON::makeBool(pdf.allowModifyAll()));
JSON j_parameters = j_encrypt.addDictionaryMember("parameters", JSON::makeDictionary());
j_parameters.addDictionaryMember("R", JSON::makeInt(R));
j_parameters.addDictionaryMember("V", JSON::makeInt(V));
j_parameters.addDictionaryMember("P", JSON::makeInt(P));
int bits = 0;
JSON key = JSON::makeNull();
if (is_encrypted) {
std::string encryption_key = pdf.getEncryptionKey();
bits = QIntC::to_int(encryption_key.length() * 8);
if (m->show_encryption_key) {
key = JSON::makeString(QUtil::hex_encode(encryption_key));
}
}
j_parameters.addDictionaryMember("bits", JSON::makeInt(bits));
j_parameters.addDictionaryMember("key", key);
auto fix_method = [is_encrypted](QPDF::encryption_method_e& method) {
if (is_encrypted && method == QPDF::e_none) {
method = QPDF::e_rc4;
}
};
fix_method(stream_method);
fix_method(string_method);
fix_method(file_method);
std::string s_stream_method = show_encryption_method(stream_method);
std::string s_string_method = show_encryption_method(string_method);
std::string s_file_method = show_encryption_method(file_method);
std::string s_overall_method;
if ((stream_method == string_method) && (stream_method == file_method)) {
s_overall_method = s_stream_method;
} else {
s_overall_method = "mixed";
}
j_parameters.addDictionaryMember("method", JSON::makeString(s_overall_method));
j_parameters.addDictionaryMember("streammethod", JSON::makeString(s_stream_method));
j_parameters.addDictionaryMember("stringmethod", JSON::makeString(s_string_method));
j_parameters.addDictionaryMember("filemethod", JSON::makeString(s_file_method));
JSON::writeDictionaryItem(p, first, "encrypt", j_encrypt, 1);
}
void
QPDFJob::doJSONAttachments(Pipeline* p, bool& first, QPDF& pdf)
{
auto to_iso8601 = [](std::string const& d) {
// Convert PDF date to iso8601 if not empty; if empty, return
// empty.
std::string iso8601;
QUtil::pdf_time_to_iso8601(d, iso8601);
return iso8601;
};
auto null_or_string = [](std::string const& s) {
if (s.empty()) {
return JSON::makeNull();
} else {
return JSON::makeString(s);
}
};
JSON j_attachments = JSON::makeDictionary();
QPDFEmbeddedFileDocumentHelper efdh(pdf);
for (auto const& iter: efdh.getEmbeddedFiles()) {
std::string const& key = iter.first;
auto fsoh = iter.second;
auto j_details = j_attachments.addDictionaryMember(key, JSON::makeDictionary());
j_details.addDictionaryMember(
"filespec", JSON::makeString(fsoh->getObjectHandle().unparse()));
j_details.addDictionaryMember("preferredname", JSON::makeString(fsoh->getFilename()));
j_details.addDictionaryMember(
"preferredcontents", JSON::makeString(fsoh->getEmbeddedFileStream().unparse()));
j_details.addDictionaryMember("description", null_or_string(fsoh->getDescription()));
auto j_names = j_details.addDictionaryMember("names", JSON::makeDictionary());
for (auto const& i2: fsoh->getFilenames()) {
j_names.addDictionaryMember(i2.first, JSON::makeString(i2.second));
}
auto j_streams = j_details.addDictionaryMember("streams", JSON::makeDictionary());
for (auto const& i2: fsoh->getEmbeddedFileStreams().ditems()) {
auto efs = QPDFEFStreamObjectHelper(i2.second);
auto j_stream = j_streams.addDictionaryMember(i2.first, JSON::makeDictionary());
j_stream.addDictionaryMember(
"creationdate", null_or_string(to_iso8601(efs.getCreationDate())));
j_stream.addDictionaryMember(
"modificationdate", null_or_string(to_iso8601(efs.getCreationDate())));
j_stream.addDictionaryMember("mimetype", null_or_string(efs.getSubtype()));
j_stream.addDictionaryMember(
"checksum", null_or_string(QUtil::hex_encode(efs.getChecksum())));
}
}
JSON::writeDictionaryItem(p, first, "attachments", j_attachments, 1);
}
JSON
QPDFJob::json_schema(int json_version, std::set<std::string>* keys)
{
// Style: use all lower-case keys with no dashes or underscores. Choose array or dictionary
// based on indexing. For example, we use a dictionary for objects because we want to index by
// object ID and an array for pages because we want to index by position. The pages in the pages
// array contain references back to the original object, which can be resolved in the objects
// dictionary. When a PDF construct that maps back to an original object is represented
// separately, use "object" as the key that references the original object.
// This JSON object doubles as a schema and as documentation for our JSON output. Any schema
// mismatch is a bug in qpdf. This helps to enforce our policy of consistently providing a known
// structure where every documented key will always be present, which makes it easier to consume
// our JSON. This is discussed in more depth in the manual.
JSON schema = JSON::makeDictionary();
schema.addDictionaryMember(
"version",
JSON::makeString("JSON format serial number; increased for non-compatible changes"));
JSON j_params = schema.addDictionaryMember("parameters", JSON::parse(R"({
"decodelevel": "decode level used to determine stream filterability"
})"));
bool all_keys = ((keys == nullptr) || keys->empty());
// The list of selectable top-level keys id duplicated in the following places: job.yml,
// QPDFJob::json_schema, and QPDFJob::doJSON.
if (json_version == 1) {
if (all_keys || keys->count("objects")) {
schema.addDictionaryMember("objects", JSON::parse(R"({
"<n n R|trailer>": "json representation of object"
})"));
}
if (all_keys || keys->count("objectinfo")) {
JSON objectinfo = schema.addDictionaryMember("objectinfo", JSON::parse(R"({
"<object-id>": {
"stream": {
"filter": "if stream, its filters, otherwise null",
"is": "whether the object is a stream",
"length": "if stream, its length, otherwise null"
}
}
})"));
}
} else {
if (all_keys || keys->count("qpdf")) {
schema.addDictionaryMember("qpdf", JSON::parse(R"([{
"jsonversion": "numeric JSON version",
"pdfversion": "PDF version as x.y",
"pushedinheritedpageresources": "whether inherited attributes were pushed to the page level",
"calledgetallpages": "whether getAllPages was called",
"maxobjectid": "highest object ID in output, ignored on input"
},
{
"<obj:n n R|trailer>": "json representation of object"
}])"));
}
}
if (all_keys || keys->count("pages")) {
JSON page = schema.addDictionaryMember("pages", JSON::parse(R"([
{
"contents": [
"reference to each content stream"
],
"images": [
{
"bitspercomponent": "bits per component",
"colorspace": "color space",
"decodeparms": [
"decode parameters for image data"
],
"filter": [
"filters applied to image data"
],
"filterable": "whether image data can be decoded using the decode level qpdf was invoked with",
"height": "image height",
"name": "name of image in XObject table",
"object": "reference to image stream",
"width": "image width"
}
],
"label": "page label dictionary, or null if none",
"object": "reference to original page object",
"outlines": [
{
"dest": "outline destination dictionary",
"object": "reference to outline that targets this page",
"title": "outline title"
}
],
"pageposfrom1": "position of page in document numbering from 1"
}
])"));
}
if (all_keys || keys->count("pagelabels")) {
JSON labels = schema.addDictionaryMember("pagelabels", JSON::parse(R"([
{
"index": "starting page position starting from zero",
"label": "page label dictionary"
}
])"));
}
if (all_keys || keys->count("outlines")) {
JSON outlines = schema.addDictionaryMember("outlines", JSON::parse(R"([
{
"dest": "outline destination dictionary",
"destpageposfrom1": "position of destination page in document numbered from 1; null if not known",
"kids": "array of descendent outlines",
"object": "reference to this outline",
"open": "whether the outline is displayed expanded",
"title": "outline title"
}
])"));
}
if (all_keys || keys->count("acroform")) {
JSON acroform = schema.addDictionaryMember("acroform", JSON::parse(R"({
"fields": [
{
"alternativename": "alternative name of field -- this is the one usually shown to users",
"annotation": {
"annotationflags": "annotation flags from /F -- see pdf_annotation_flag_e in qpdf/Constants.h",
"appearancestate": "appearance state -- can be used to determine value for checkboxes and radio buttons",
"object": "reference to the annotation object"
},
"choices": "for choices fields, the list of choices presented to the user",
"defaultvalue": "default value of field",
"fieldflags": "form field flags from /Ff -- see pdf_form_field_flag_e in qpdf/Constants.h",
"fieldtype": "field type",
"fullname": "full name of field",
"ischeckbox": "whether field is a checkbox",
"ischoice": "whether field is a list, combo, or dropdown",
"isradiobutton": "whether field is a radio button -- buttons in a single group share a parent",
"istext": "whether field is a text field",
"mappingname": "mapping name of field",
"object": "reference to this form field",
"pageposfrom1": "position of containing page numbered from 1",
"parent": "reference to this field's parent",
"partialname": "partial name of field",
"quadding": "field quadding -- number indicating left, center, or right",
"value": "value of field"
}
],
"hasacroform": "whether the document has interactive forms",
"needappearances": "whether the form fields' appearance streams need to be regenerated"
})"));
}
std::string MODIFY_ANNOTATIONS =
(json_version == 1 ? "moddifyannotations" : "modifyannotations");
if (all_keys || keys->count("encrypt")) {
JSON encrypt = schema.addDictionaryMember("encrypt", JSON::parse(R"({
"capabilities": {
"accessibility": "allow extraction for accessibility?",
"extract": "allow extraction?",
")" + MODIFY_ANNOTATIONS + R"(": "allow modifying annotations?",
"modify": "allow all modifications?",
"modifyassembly": "allow modifying document assembly?",
"modifyforms": "allow modifying forms?",
"modifyother": "allow other modifications?",
"printhigh": "allow high resolution printing?",
"printlow": "allow low resolution printing?"
},
"encrypted": "whether the document is encrypted",
"ownerpasswordmatched": "whether supplied password matched owner password; always false for non-encrypted files",
"recovereduserpassword": "If the owner password was used to recover the user password, reveal user password; otherwise null",
"parameters": {
"P": "P value from Encrypt dictionary",
"R": "R value from Encrypt dictionary",
"V": "V value from Encrypt dictionary",
"bits": "encryption key bit length",
"filemethod": "encryption method for attachments",
"key": "encryption key; will be null unless --show-encryption-key was specified",
"method": "overall encryption method: none, mixed, RC4, AESv2, AESv3",
"streammethod": "encryption method for streams",
"stringmethod": "encryption method for string"
},
"userpasswordmatched": "whether supplied password matched user password; always false for non-encrypted files"
})"));
}
if (all_keys || keys->count("attachments")) {
JSON attachments = schema.addDictionaryMember("attachments", JSON::parse(R"({
"<attachment-key>": {
"filespec": "object containing the file spec",
"preferredcontents": "most preferred embedded file stream",
"preferredname": "most preferred file name",
"description": "description of attachment",
"names": {
"<name-key>": "file name for key"
},
"streams": {
"<stream-key>": {
"creationdate": "ISO-8601 creation date or null",
"modificationdate": "ISO-8601 modification date or null",
"mimetype": "mime type or null",
"checksum": "MD5 checksum or null"
}
}
}
})"));
}
return schema;
}
std::string
QPDFJob::json_out_schema(int version)
{
return json_schema(version).unparse();
}
std::string
QPDFJob::json_out_schema_v1()
{
return json_schema(1).unparse();
}
void
QPDFJob::doJSON(QPDF& pdf, Pipeline* p)
{
// qpdf guarantees that no new top-level keys whose names start with "x-" will be added. These
// are reserved for users.
std::string captured_json;
std::shared_ptr<Pl_String> pl_str;
if (m->test_json_schema) {
pl_str = std::make_shared<Pl_String>("capture json", p, captured_json);
p = pl_str.get();
}
bool first = true;
JSON::writeDictionaryOpen(p, first, 0);
if (m->json_output) {
// Exclude version and parameters to keep the output file minimal. The JSON version is
// inside the "qpdf" key for version 2.
} else {
// This version is updated every time a non-backward-compatible change is made to the JSON
// format. Clients of the JSON are to ignore unrecognized keys, so we only update the
// version of a key disappears or if its value changes meaning.
JSON::writeDictionaryItem(p, first, "version", JSON::makeInt(m->json_version), 1);
JSON j_params = JSON::makeDictionary();
std::string decode_level_str;
switch (m->decode_level) {
case qpdf_dl_none:
decode_level_str = "none";
break;
case qpdf_dl_generalized:
decode_level_str = "generalized";
break;
case qpdf_dl_specialized:
decode_level_str = "specialized";
break;
case qpdf_dl_all:
decode_level_str = "all";
break;
}
j_params.addDictionaryMember("decodelevel", JSON::makeString(decode_level_str));
JSON::writeDictionaryItem(p, first, "parameters", j_params, 1);
}
bool all_keys = m->json_keys.empty();
// The list of selectable top-level keys id duplicated in the following places: job.yml,
// QPDFJob::json_schema, and QPDFJob::doJSON.
// We do pages and pagelabels first since they have the side effect of repairing the pages tree,
// which could potentially impact object references in remaining items.
if (all_keys || m->json_keys.count("pages")) {
doJSONPages(p, first, pdf);
}
if (all_keys || m->json_keys.count("pagelabels")) {
doJSONPageLabels(p, first, pdf);
}
// The non-special keys are output in alphabetical order, but the order doesn't actually matter.
if (all_keys || m->json_keys.count("acroform")) {
doJSONAcroform(p, first, pdf);
}
if (all_keys || m->json_keys.count("attachments")) {
doJSONAttachments(p, first, pdf);
}
if (all_keys || m->json_keys.count("encrypt")) {
doJSONEncrypt(p, first, pdf);
}
if (all_keys || m->json_keys.count("outlines")) {
doJSONOutlines(p, first, pdf);
}
// We do objects last so their information is consistent with repairing the page tree. To see
// the original file with any page tree problems and the page tree not flattened, select
// qpdf/objects/objectinfo without other keys.
if (all_keys || m->json_keys.count("objects") || m->json_keys.count("qpdf")) {
doJSONObjects(p, first, pdf);
}
if (m->json_version == 1) {
// "objectinfo" is not needed for version >1 since you can tell streams from other objects
// in "objects".
if (all_keys || m->json_keys.count("objectinfo")) {
doJSONObjectinfo(p, first, pdf);
}
}
JSON::writeDictionaryClose(p, first, 0);
*p << "\n";
if (m->test_json_schema) {
// Check against schema
JSON schema = json_schema(m->json_version, &m->json_keys);
std::list<std::string> errors;
JSON captured = JSON::parse(captured_json);
if (!captured.checkSchema(schema, errors)) {
m->log->error("QPDFJob didn't create JSON that complies with its own rules.\n");
for (auto const& error: errors) {
*m->log->getError() << error << "\n";
}
}
}
}
void
QPDFJob::doInspection(QPDF& pdf)
{
auto& cout = *m->log->getInfo();
if (m->check) {
doCheck(pdf);
}
if (m->show_npages) {
QTC::TC("qpdf", "QPDFJob npages");
cout << pdf.getRoot().getKey("/Pages").getKey("/Count").getIntValue() << "\n";
}
if (m->show_encryption) {
showEncryption(pdf);
}
if (m->check_linearization) {
if (!pdf.isLinearized()) {
cout << m->infilename.get() << " is not linearized\n";
} else if (pdf.checkLinearization()) {
cout << m->infilename.get() << ": no linearization errors\n";
} else {
m->warnings = true;
}
}
if (m->show_linearization) {
if (pdf.isLinearized()) {
pdf.showLinearizationData();
} else {
cout << m->infilename.get() << " is not linearized\n";
}
}
if (m->show_xref) {
pdf.showXRefTable();
}
if ((m->show_obj > 0) || m->show_trailer) {
doShowObj(pdf);
}
if (m->show_pages) {
doShowPages(pdf);
}
if (m->list_attachments) {
doListAttachments(pdf);
}
if (!m->attachment_to_show.empty()) {
doShowAttachment(pdf);
}
if (!pdf.getWarnings().empty()) {
m->warnings = true;
}
}
void
QPDFJob::doProcessOnce(
std::unique_ptr<QPDF>& pdf,
std::function<void(QPDF*, char const*)> fn,
char const* password,
bool empty,
bool used_for_input,
bool main_input)
{
pdf = std::make_unique<QPDF>();
setQPDFOptions(*pdf);
if (empty) {
pdf->emptyPDF();
} else if (main_input && m->json_input) {
pdf->createFromJSON(m->infilename.get());
} else {
fn(pdf.get(), password);
}
if (used_for_input) {
m->max_input_version.updateIfGreater(pdf->getVersionAsPDFVersion());
}
}
void
QPDFJob::doProcess(
std::unique_ptr<QPDF>& pdf,
std::function<void(QPDF*, char const*)> fn,
char const* password,
bool empty,
bool used_for_input,
bool main_input)
{
// If a password has been specified but doesn't work, try other passwords that are equivalent in
// different character encodings. This makes it possible to open PDF files that were encrypted
// using incorrect string encodings. For example, if someone used a password encoded in PDF Doc
// encoding or Windows code page 1252 for an AES-encrypted file or a UTF-8-encoded password on
// an RC4-encrypted file, or if the password was properly encoded but the password given here
// was incorrectly encoded, there's a good chance we'd succeed here.
std::string ptemp;
if (password && (!m->password_is_hex_key)) {
if (m->password_mode == QPDFJob::pm_hex_bytes) {
// Special case: handle --password-mode=hex-bytes for input password as well as output
// password
QTC::TC("qpdf", "QPDFJob input password hex-bytes");
ptemp = QUtil::hex_decode(password);
password = ptemp.c_str();
}
}
if ((password == nullptr) || empty || m->password_is_hex_key || m->suppress_password_recovery) {
// There is no password, or we're not doing recovery, so just do the normal processing with
// the supplied password.
doProcessOnce(pdf, fn, password, empty, used_for_input, main_input);
return;
}
// Get a list of otherwise encoded strings. Keep in scope for this method.
std::vector<std::string> passwords_str = QUtil::possible_repaired_encodings(password);
// Represent to char const*, as required by the QPDF class.
std::vector<char const*> passwords;
for (auto const& iter: passwords_str) {
passwords.push_back(iter.c_str());
}
// We always try the supplied password first because it is the first string returned by
// possible_repaired_encodings. If there is more than one option, go ahead and put the supplied
// password at the end so that it's that decoding attempt whose exception is thrown.
if (passwords.size() > 1) {
passwords.push_back(password);
}
// Try each password. If one works, return the resulting object. If they all fail, throw the
// exception thrown by the final attempt, which, like the first attempt, will be with the
// supplied password.
bool warned = false;
for (auto iter = passwords.begin(); iter != passwords.end(); ++iter) {
try {
doProcessOnce(pdf, fn, *iter, empty, used_for_input, main_input);
return;
} catch (QPDFExc&) {
auto next = iter;
++next;
if (next == passwords.end()) {
throw;
}
}
if (!warned) {
warned = true;
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix
<< ": supplied password didn't work; trying other passwords based on "
"interpreting password with different string encodings\n";
});
}
}
// Should not be reachable
throw std::logic_error("do_process returned");
}
void
QPDFJob::processFile(
std::unique_ptr<QPDF>& pdf,
char const* filename,
char const* password,
bool used_for_input,
bool main_input)
{
auto f1 = std::mem_fn<void(char const*, char const*)>(&QPDF::processFile);
auto fn = std::bind(f1, std::placeholders::_1, filename, std::placeholders::_2);
doProcess(pdf, fn, password, strcmp(filename, "") == 0, used_for_input, main_input);
}
void
QPDFJob::processInputSource(
std::unique_ptr<QPDF>& pdf,
std::shared_ptr<InputSource> is,
char const* password,
bool used_for_input)
{
auto f1 = std::mem_fn(&QPDF::processInputSource);
auto fn = std::bind(f1, std::placeholders::_1, is, std::placeholders::_2);
doProcess(pdf, fn, password, false, used_for_input, false);
}
void
QPDFJob::validateUnderOverlay(QPDF& pdf, UnderOverlay* uo)
{
QPDFPageDocumentHelper main_pdh(pdf);
int main_npages = QIntC::to_int(main_pdh.getAllPages().size());
processFile(uo->pdf, uo->filename.c_str(), uo->password.get(), true, false);
QPDFPageDocumentHelper uo_pdh(*(uo->pdf));
int uo_npages = QIntC::to_int(uo_pdh.getAllPages().size());
try {
uo->to_pagenos = QUtil::parse_numrange(uo->to_nr.c_str(), main_npages);
} catch (std::runtime_error& e) {
throw std::runtime_error(
"parsing numeric range for " + uo->which + " \"to\" pages: " + e.what());
}
try {
if (uo->from_nr.empty()) {
QTC::TC("qpdf", "QPDFJob from_nr from repeat_nr");
uo->from_nr = uo->repeat_nr;
}
uo->from_pagenos = QUtil::parse_numrange(uo->from_nr.c_str(), uo_npages);
if (!uo->repeat_nr.empty()) {
uo->repeat_pagenos = QUtil::parse_numrange(uo->repeat_nr.c_str(), uo_npages);
}
} catch (std::runtime_error& e) {
throw std::runtime_error(
"parsing numeric range for " + uo->which + " file " + uo->filename + ": " + e.what());
}
}
static QPDFAcroFormDocumentHelper*
get_afdh_for_qpdf(
std::map<unsigned long long, std::shared_ptr<QPDFAcroFormDocumentHelper>>& afdh_map, QPDF* q)
{
auto uid = q->getUniqueId();
if (!afdh_map.count(uid)) {
afdh_map[uid] = std::make_shared<QPDFAcroFormDocumentHelper>(*q);
}
return afdh_map[uid].get();
}
std::string
QPDFJob::doUnderOverlayForPage(
QPDF& pdf,
UnderOverlay& uo,
std::map<int, std::map<size_t, std::vector<int>>>& pagenos,
size_t page_idx,
size_t uo_idx,
std::map<int, std::map<size_t, QPDFObjectHandle>>& fo,
std::vector<QPDFPageObjectHelper>& pages,
QPDFPageObjectHelper& dest_page)
{
int pageno = 1 + QIntC::to_int(page_idx);
if (!(pagenos.count(pageno) && pagenos[pageno].count(uo_idx))) {
return "";
}
std::map<unsigned long long, std::shared_ptr<QPDFAcroFormDocumentHelper>> afdh;
auto make_afdh = [&](QPDFPageObjectHelper& ph) {
QPDF& q = ph.getObjectHandle().getQPDF();
return get_afdh_for_qpdf(afdh, &q);
};
auto dest_afdh = make_afdh(dest_page);
std::string content;
int min_suffix = 1;
QPDFObjectHandle resources = dest_page.getAttribute("/Resources", true);
for (int from_pageno: pagenos[pageno][uo_idx]) {
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << " " << uo.filename << " " << uo.which << " " << from_pageno << "\n";
});
auto from_page = pages.at(QIntC::to_size(from_pageno - 1));
if (fo[from_pageno].count(uo_idx) == 0) {
fo[from_pageno][uo_idx] = pdf.copyForeignObject(from_page.getFormXObjectForPage());
}
// If the same page is overlaid or underlaid multiple times, we'll generate multiple names
// for it, but that's harmless and also a pretty goofy case that's not worth coding around.
std::string name = resources.getUniqueResourceName("/Fx", min_suffix);
QPDFMatrix cm;
std::string new_content = dest_page.placeFormXObject(
fo[from_pageno][uo_idx], name, dest_page.getTrimBox().getArrayAsRectangle(), cm);
dest_page.copyAnnotations(from_page, cm, dest_afdh, make_afdh(from_page));
if (!new_content.empty()) {
resources.mergeResources("<< /XObject << >> >>"_qpdf);
auto xobject = resources.getKey("/XObject");
if (xobject.isDictionary()) {
xobject.replaceKey(name, fo[from_pageno][uo_idx]);
}
++min_suffix;
content += new_content;
}
}
return content;
}
void
QPDFJob::getUOPagenos(
std::vector<QPDFJob::UnderOverlay>& uos,
std::map<int, std::map<size_t, std::vector<int>>>& pagenos)
{
size_t uo_idx = 0;
for (auto const& uo: uos) {
size_t page_idx = 0;
size_t from_size = uo.from_pagenos.size();
size_t repeat_size = uo.repeat_pagenos.size();
for (int to_pageno: uo.to_pagenos) {
if (page_idx < from_size) {
pagenos[to_pageno][uo_idx].push_back(uo.from_pagenos.at(page_idx));
} else if (repeat_size) {
pagenos[to_pageno][uo_idx].push_back(
uo.repeat_pagenos.at((page_idx - from_size) % repeat_size));
}
++page_idx;
}
++uo_idx;
}
}
void
QPDFJob::handleUnderOverlay(QPDF& pdf)
{
if (m->underlay.empty() && m->overlay.empty()) {
return;
}
for (auto& uo: m->underlay) {
validateUnderOverlay(pdf, &uo);
}
for (auto& uo: m->overlay) {
validateUnderOverlay(pdf, &uo);
}
// First map key is 1-based page number. Second is index into the overlay/underlay vector. Watch
// out to not reverse the keys or be off by one.
std::map<int, std::map<size_t, std::vector<int>>> underlay_pagenos;
std::map<int, std::map<size_t, std::vector<int>>> overlay_pagenos;
getUOPagenos(m->underlay, underlay_pagenos);
getUOPagenos(m->overlay, overlay_pagenos);
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix << ": processing underlay/overlay\n";
});
auto get_pages = [](std::vector<UnderOverlay>& v,
std::vector<std::vector<QPDFPageObjectHelper>>& v_out) {
for (auto const& uo: v) {
if (uo.pdf) {
v_out.push_back(QPDFPageDocumentHelper(*(uo.pdf)).getAllPages());
}
}
};
std::vector<std::vector<QPDFPageObjectHelper>> upages;
get_pages(m->underlay, upages);
std::vector<std::vector<QPDFPageObjectHelper>> opages;
get_pages(m->overlay, opages);
std::map<int, std::map<size_t, QPDFObjectHandle>> underlay_fo;
std::map<int, std::map<size_t, QPDFObjectHandle>> overlay_fo;
QPDFPageDocumentHelper main_pdh(pdf);
auto main_pages = main_pdh.getAllPages();
size_t main_npages = main_pages.size();
for (size_t page_idx = 0; page_idx < main_npages; ++page_idx) {
auto pageno = QIntC::to_int(page_idx) + 1;
doIfVerbose(
[&](Pipeline& v, std::string const& prefix) { v << " page " << pageno << "\n"; });
if (underlay_pagenos[pageno].empty() && overlay_pagenos[pageno].empty()) {
continue;
}
// This code converts the original page, any underlays, and any overlays to form XObjects.
// Then it concatenates display of all underlays, the original page, and all overlays. Prior
// to 11.3.0, the original page contents were wrapped in q/Q, but this didn't work if the
// original page had unbalanced q/Q operators. See GitHub issue #904.
auto& dest_page = main_pages.at(page_idx);
auto dest_page_oh = dest_page.getObjectHandle();
auto this_page_fo = dest_page.getFormXObjectForPage();
// The resulting form xobject lazily reads the content from the original page, which we are
// going to replace. Therefore, we have to explicitly copy it.
auto content_data = this_page_fo.getRawStreamData();
this_page_fo.replaceStreamData(content_data, QPDFObjectHandle(), QPDFObjectHandle());
auto resources =
dest_page_oh.replaceKeyAndGetNew("/Resources", "<< /XObject << >> >>"_qpdf);
resources.getKey("/XObject").replaceKeyAndGetNew("/Fx0", this_page_fo);
size_t uo_idx{0};
std::string content;
for (auto& underlay: m->underlay) {
content += doUnderOverlayForPage(
pdf,
underlay,
underlay_pagenos,
page_idx,
uo_idx,
underlay_fo,
upages[uo_idx],
dest_page);
++uo_idx;
}
content += dest_page.placeFormXObject(
this_page_fo,
"/Fx0",
dest_page.getMediaBox().getArrayAsRectangle(),
true,
false,
false);
uo_idx = 0;
for (auto& overlay: m->overlay) {
content += doUnderOverlayForPage(
pdf,
overlay,
overlay_pagenos,
page_idx,
uo_idx,
overlay_fo,
opages[uo_idx],
dest_page);
++uo_idx;
}
dest_page_oh.replaceKey("/Contents", pdf.newStream(content));
}
}
static void
maybe_set_pagemode(QPDF& pdf, std::string const& pagemode)
{
auto root = pdf.getRoot();
if (root.getKey("/PageMode").isNull()) {
root.replaceKey("/PageMode", QPDFObjectHandle::newName(pagemode));
}
}
void
QPDFJob::addAttachments(QPDF& pdf)
{
maybe_set_pagemode(pdf, "/UseAttachments");
QPDFEmbeddedFileDocumentHelper efdh(pdf);
std::vector<std::string> duplicated_keys;
for (auto const& to_add: m->attachments_to_add) {
if ((!to_add.replace) && efdh.getEmbeddedFile(to_add.key)) {
duplicated_keys.push_back(to_add.key);
continue;
}
auto fs = QPDFFileSpecObjectHelper::createFileSpec(pdf, to_add.filename, to_add.path);
if (!to_add.description.empty()) {
fs.setDescription(to_add.description);
}
auto efs = QPDFEFStreamObjectHelper(fs.getEmbeddedFileStream());
efs.setCreationDate(to_add.creationdate).setModDate(to_add.moddate);
if (!to_add.mimetype.empty()) {
efs.setSubtype(to_add.mimetype);
}
efdh.replaceEmbeddedFile(to_add.key, fs);
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix << ": attached " << to_add.path << " as " << to_add.filename << " with key "
<< to_add.key << "\n";
});
}
if (!duplicated_keys.empty()) {
std::string message;
for (auto const& k: duplicated_keys) {
if (!message.empty()) {
message += ", ";
}
message += k;
}
message = pdf.getFilename() +
" already has attachments with the following keys: " + message +
"; use --replace to replace or --key to specify a different key";
throw std::runtime_error(message);
}
}
void
QPDFJob::copyAttachments(QPDF& pdf)
{
maybe_set_pagemode(pdf, "/UseAttachments");
QPDFEmbeddedFileDocumentHelper efdh(pdf);
std::vector<std::string> duplicates;
for (auto const& to_copy: m->attachments_to_copy) {
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix << ": copying attachments from " << to_copy.path << "\n";
});
std::unique_ptr<QPDF> other;
processFile(other, to_copy.path.c_str(), to_copy.password.c_str(), false, false);
QPDFEmbeddedFileDocumentHelper other_efdh(*other);
auto other_attachments = other_efdh.getEmbeddedFiles();
for (auto const& iter: other_attachments) {
std::string new_key = to_copy.prefix + iter.first;
if (efdh.getEmbeddedFile(new_key)) {
duplicates.push_back("file: " + to_copy.path + ", key: " + new_key);
} else {
auto new_fs_oh = pdf.copyForeignObject(iter.second->getObjectHandle());
efdh.replaceEmbeddedFile(new_key, QPDFFileSpecObjectHelper(new_fs_oh));
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << " " << iter.first << " -> " << new_key << "\n";
});
}
}
if (other->anyWarnings()) {
m->warnings = true;
}
}
if (!duplicates.empty()) {
std::string message;
for (auto const& i: duplicates) {
if (!message.empty()) {
message += "; ";
}
message += i;
}
message = pdf.getFilename() +
" already has attachments with keys that conflict with attachments from other files: " +
message +
". Use --prefix with --copy-attachments-from or manually copy individual attachments.";
throw std::runtime_error(message);
}
}
void
QPDFJob::handleTransformations(QPDF& pdf)
{
QPDFPageDocumentHelper dh(pdf);
std::shared_ptr<QPDFAcroFormDocumentHelper> afdh;
auto make_afdh = [&]() {
if (!afdh.get()) {
afdh = std::make_shared<QPDFAcroFormDocumentHelper>(pdf);
}
};
if (m->remove_restrictions) {
make_afdh();
afdh->disableDigitalSignatures();
}
if (m->externalize_inline_images || (m->optimize_images && (!m->keep_inline_images))) {
for (auto& ph: dh.getAllPages()) {
ph.externalizeInlineImages(m->ii_min_bytes);
}
}
if (m->optimize_images) {
int pageno = 0;
for (auto& ph: dh.getAllPages()) {
++pageno;
ph.forEachImage(
true,
[this, pageno, &pdf](
QPDFObjectHandle& obj, QPDFObjectHandle& xobj_dict, std::string const& key) {
auto io = std::make_unique<ImageOptimizer>(
*this, m->oi_min_width, m->oi_min_height, m->oi_min_area, obj);
if (io->evaluate("image " + key + " on page " + std::to_string(pageno))) {
QPDFObjectHandle new_image = pdf.newStream();
new_image.replaceDict(obj.getDict().shallowCopy());
new_image.replaceStreamData(
std::move(io),
QPDFObjectHandle::newName("/DCTDecode"),
QPDFObjectHandle::newNull());
xobj_dict.replaceKey(key, new_image);
}
});
}
}
if (m->generate_appearances) {
make_afdh();
afdh->generateAppearancesIfNeeded();
}
if (m->flatten_annotations) {
dh.flattenAnnotations(m->flatten_annotations_required, m->flatten_annotations_forbidden);
}
if (m->coalesce_contents) {
for (auto& page: dh.getAllPages()) {
page.coalesceContentStreams();
}
}
if (m->flatten_rotation) {
make_afdh();
for (auto& page: dh.getAllPages()) {
page.flattenRotation(afdh.get());
}
}
if (m->remove_page_labels) {
pdf.getRoot().removeKey("/PageLabels");
}
if (!m->page_label_specs.empty()) {
auto nums = QPDFObjectHandle::newArray();
auto n_pages = QIntC::to_int(dh.getAllPages().size());
int last_page_seen{0};
for (auto& spec: m->page_label_specs) {
if (spec.first_page < 0) {
spec.first_page = n_pages + 1 + spec.first_page;
}
if (last_page_seen == 0) {
if (spec.first_page != 1) {
throw std::runtime_error(
"the first page label specification must start with page 1");
}
} else if (spec.first_page <= last_page_seen) {
throw std::runtime_error(
"page label specifications must be in order by first page");
}
if (spec.first_page > n_pages) {
throw std::runtime_error(
"page label spec: page " + std::to_string(spec.first_page) +
" is more than the total number of pages (" + std::to_string(n_pages) + ")");
}
last_page_seen = spec.first_page;
nums.appendItem(QPDFObjectHandle::newInteger(spec.first_page - 1));
nums.appendItem(QPDFPageLabelDocumentHelper::pageLabelDict(
spec.label_type, spec.start_num, spec.prefix));
}
auto page_labels = QPDFObjectHandle::newDictionary();
page_labels.replaceKey("/Nums", nums);
pdf.getRoot().replaceKey("/PageLabels", page_labels);
}
if (!m->attachments_to_remove.empty()) {
QPDFEmbeddedFileDocumentHelper efdh(pdf);
for (auto const& key: m->attachments_to_remove) {
if (efdh.removeEmbeddedFile(key)) {
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix << ": removed attachment " << key << "\n";
});
} else {
throw std::runtime_error("attachment " + key + " not found");
}
}
}
if (!m->attachments_to_add.empty()) {
addAttachments(pdf);
}
if (!m->attachments_to_copy.empty()) {
copyAttachments(pdf);
}
}
bool
QPDFJob::shouldRemoveUnreferencedResources(QPDF& pdf)
{
if (m->remove_unreferenced_page_resources == QPDFJob::re_no) {
return false;
} else if (m->remove_unreferenced_page_resources == QPDFJob::re_yes) {
return true;
}
// Unreferenced resources are common in files where resources dictionaries are shared across
// pages. As a heuristic, we look in the file for shared resources dictionaries or shared
// XObject subkeys of resources dictionaries either on pages or on form XObjects in pages. If we
// find any, then there is a higher likelihood that the expensive process of finding
// unreferenced resources is worth it.
// Return true as soon as we find any shared resources.
QPDFObjGen::set resources_seen; // shared resources detection
QPDFObjGen::set nodes_seen; // loop detection
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix << ": " << pdf.getFilename() << ": checking for shared resources\n";
});
std::list<QPDFObjectHandle> queue;
queue.push_back(pdf.getRoot().getKey("/Pages"));
while (!queue.empty()) {
QPDFObjectHandle node = *queue.begin();
queue.pop_front();
QPDFObjGen og = node.getObjGen();
if (!nodes_seen.add(og)) {
continue;
}
QPDFObjectHandle dict = node.isStream() ? node.getDict() : node;
QPDFObjectHandle kids = dict.getKey("/Kids");
if (kids.isArray()) {
// This is a non-leaf node.
if (dict.hasKey("/Resources")) {
QTC::TC("qpdf", "QPDFJob found resources in non-leaf");
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << " found resources in non-leaf page node " << og.unparse(' ') << "\n";
});
return true;
}
int n = kids.getArrayNItems();
for (int i = 0; i < n; ++i) {
queue.push_back(kids.getArrayItem(i));
}
} else {
// This is a leaf node or a form XObject.
QPDFObjectHandle resources = dict.getKey("/Resources");
if (resources.isIndirect()) {
if (!resources_seen.add(resources)) {
QTC::TC("qpdf", "QPDFJob found shared resources in leaf");
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << " found shared resources in leaf node " << og.unparse(' ') << ": "
<< resources.getObjGen().unparse(' ') << "\n";
});
return true;
}
}
QPDFObjectHandle xobject =
(resources.isDictionary() ? resources.getKey("/XObject")
: QPDFObjectHandle::newNull());
if (xobject.isIndirect()) {
if (!resources_seen.add(xobject)) {
QTC::TC("qpdf", "QPDFJob found shared xobject in leaf");
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << " found shared xobject in leaf node " << og.unparse(' ') << ": "
<< xobject.getObjGen().unparse(' ') << "\n";
});
return true;
}
}
if (xobject.isDictionary()) {
for (auto const& k: xobject.getKeys()) {
QPDFObjectHandle xobj = xobject.getKey(k);
if (xobj.isFormXObject()) {
queue.push_back(xobj);
}
}
}
}
}
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix << ": no shared resources found\n";
});
return false;
}
static QPDFObjectHandle
added_page(QPDF& pdf, QPDFObjectHandle page)
{
QPDFObjectHandle result = page;
if (&page.getQPDF() != &pdf) {
// Calling copyForeignObject on an object we already copied will give us the already
// existing copy.
result = pdf.copyForeignObject(page);
}
return result;
}
static QPDFObjectHandle
added_page(QPDF& pdf, QPDFPageObjectHelper page)
{
return added_page(pdf, page.getObjectHandle());
}
void
QPDFJob::handlePageSpecs(QPDF& pdf, std::vector<std::unique_ptr<QPDF>>& page_heap)
{
// Parse all page specifications and translate them into lists of actual pages.
// Handle "." as a shortcut for the input file
for (auto& page_spec: m->page_specs) {
if (page_spec.filename == ".") {
page_spec.filename = m->infilename.get();
}
if (page_spec.range.empty()) {
page_spec.range = "1-z";
}
}
if (!m->keep_files_open_set) {
// Count the number of distinct files to determine whether we should keep files open or not.
// Rather than trying to code some portable heuristic based on OS limits, just hard-code
// this at a given number and allow users to override.
std::set<std::string> filenames;
for (auto& page_spec: m->page_specs) {
filenames.insert(page_spec.filename);
}
m->keep_files_open = (filenames.size() <= m->keep_files_open_threshold);
QTC::TC("qpdf", "QPDFJob automatically set keep files open", m->keep_files_open ? 0 : 1);
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix << ": selecting --keep-open-files=" << (m->keep_files_open ? "y" : "n")
<< "\n";
});
}
// Create a QPDF object for each file that we may take pages from.
std::map<std::string, QPDF*> page_spec_qpdfs;
std::map<std::string, ClosedFileInputSource*> page_spec_cfis;
page_spec_qpdfs[m->infilename.get()] = &pdf;
std::vector<QPDFPageData> parsed_specs;
std::map<unsigned long long, std::set<QPDFObjGen>> copied_pages;
for (auto& page_spec: m->page_specs) {
if (page_spec_qpdfs.count(page_spec.filename) == 0) {
// Open the PDF file and store the QPDF object. Throw a std::shared_ptr to the qpdf into
// a heap so that it survives through copying to the output but gets cleaned up
// automatically at the end. Do not canonicalize the file name. Using two different
// paths to refer to the same file is a documented workaround for duplicating a page. If
// you are using this an example of how to do this with the API, you can just create two
// different QPDF objects to the same underlying file with the same path to achieve the
// same effect.
char const* password = page_spec.password.get();
if ((!m->encryption_file.empty()) && (password == nullptr) &&
(page_spec.filename == m->encryption_file)) {
QTC::TC("qpdf", "QPDFJob pages encryption password");
password = m->encryption_file_password.get();
}
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix << ": processing " << page_spec.filename << "\n";
});
std::shared_ptr<InputSource> is;
ClosedFileInputSource* cis = nullptr;
if (!m->keep_files_open) {
QTC::TC("qpdf", "QPDFJob keep files open n");
cis = new ClosedFileInputSource(page_spec.filename.c_str());
is = std::shared_ptr<InputSource>(cis);
cis->stayOpen(true);
} else {
QTC::TC("qpdf", "QPDFJob keep files open y");
FileInputSource* fis = new FileInputSource(page_spec.filename.c_str());
is = std::shared_ptr<InputSource>(fis);
}
std::unique_ptr<QPDF> qpdf_sp;
processInputSource(qpdf_sp, is, password, true);
page_spec_qpdfs[page_spec.filename] = qpdf_sp.get();
page_heap.push_back(std::move(qpdf_sp));
if (cis) {
cis->stayOpen(false);
page_spec_cfis[page_spec.filename] = cis;
}
}
// Read original pages from the PDF, and parse the page range associated with this
// occurrence of the file.
parsed_specs.emplace_back(
page_spec.filename, page_spec_qpdfs[page_spec.filename], page_spec.range);
}
std::map<unsigned long long, bool> remove_unreferenced;
if (m->remove_unreferenced_page_resources != QPDFJob::re_no) {
for (auto const& iter: page_spec_qpdfs) {
std::string const& filename = iter.first;
ClosedFileInputSource* cis = nullptr;
if (page_spec_cfis.count(filename)) {
cis = page_spec_cfis[filename];
cis->stayOpen(true);
}
QPDF& other(*(iter.second));
auto other_uuid = other.getUniqueId();
if (remove_unreferenced.count(other_uuid) == 0) {
remove_unreferenced[other_uuid] = shouldRemoveUnreferencedResources(other);
}
if (cis) {
cis->stayOpen(false);
}
}
}
// Clear all pages out of the primary QPDF's pages tree but leave the objects in place in the
// file so they can be re-added without changing their object numbers. This enables other things
// in the original file, such as outlines, to continue to work.
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix << ": removing unreferenced pages from primary input\n";
});
QPDFPageDocumentHelper dh(pdf);
std::vector<QPDFPageObjectHelper> orig_pages = dh.getAllPages();
for (auto const& page: orig_pages) {
dh.removePage(page);
}
auto n_collate = m->collate.size();
auto n_specs = parsed_specs.size();
if (!(n_collate == 0 || n_collate == 1 || n_collate == n_specs)) {
usage("--pages: if --collate has more than one value, it must have one value per page "
"specification");
}
if (n_collate > 0 && n_specs > 1) {
// Collate the pages by selecting one page from each spec in order. When a spec runs out of
// pages, stop selecting from it.
std::vector<QPDFPageData> new_parsed_specs;
// Make sure we have a collate value for each spec. We have already checked that a non-empty
// collate has either one value or one value per spec.
for (auto i = n_collate; i < n_specs; ++i) {
m->collate.push_back(m->collate.at(0));
}
std::vector<size_t> cur_page(n_specs, 0);
bool got_pages = true;
while (got_pages) {
got_pages = false;
for (size_t i = 0; i < n_specs; ++i) {
QPDFPageData& page_data = parsed_specs.at(i);
for (size_t j = 0; j < m->collate.at(i); ++j) {
if (cur_page.at(i) + j < page_data.selected_pages.size()) {
got_pages = true;
new_parsed_specs.emplace_back(
page_data, page_data.selected_pages.at(cur_page.at(i) + j));
}
}
cur_page.at(i) += m->collate.at(i);
}
}
parsed_specs = new_parsed_specs;
}
// Add all the pages from all the files in the order specified. Keep track of any pages from the
// original file that we are selecting.
std::set<int> selected_from_orig;
std::vector<QPDFObjectHandle> new_labels;
bool any_page_labels = false;
int out_pageno = 0;
std::map<unsigned long long, std::shared_ptr<QPDFAcroFormDocumentHelper>> afdh_map;
auto this_afdh = get_afdh_for_qpdf(afdh_map, &pdf);
std::set<QPDFObjGen> referenced_fields;
for (auto& page_data: parsed_specs) {
ClosedFileInputSource* cis = nullptr;
if (page_spec_cfis.count(page_data.filename)) {
cis = page_spec_cfis[page_data.filename];
cis->stayOpen(true);
}
QPDFPageLabelDocumentHelper pldh(*page_data.qpdf);
auto other_afdh = get_afdh_for_qpdf(afdh_map, page_data.qpdf);
if (pldh.hasPageLabels()) {
any_page_labels = true;
}
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix << ": adding pages from " << page_data.filename << "\n";
});
for (auto pageno_iter: page_data.selected_pages) {
// Pages are specified from 1 but numbered from 0 in the vector
int pageno = pageno_iter - 1;
pldh.getLabelsForPageRange(pageno, pageno, out_pageno++, new_labels);
QPDFPageObjectHelper to_copy = page_data.orig_pages.at(QIntC::to_size(pageno));
QPDFObjGen to_copy_og = to_copy.getObjectHandle().getObjGen();
unsigned long long from_uuid = page_data.qpdf->getUniqueId();
if (copied_pages[from_uuid].count(to_copy_og)) {
QTC::TC(
"qpdf",
"QPDFJob copy same page more than once",
(page_data.qpdf == &pdf) ? 0 : 1);
to_copy = to_copy.shallowCopyPage();
} else {
copied_pages[from_uuid].insert(to_copy_og);
if (remove_unreferenced[from_uuid]) {
to_copy.removeUnreferencedResources();
}
}
dh.addPage(to_copy, false);
bool first_copy_from_orig = false;
bool this_file = (page_data.qpdf == &pdf);
if (this_file) {
// This is a page from the original file. Keep track of the fact that we are using
// it.
first_copy_from_orig = (selected_from_orig.count(pageno) == 0);
selected_from_orig.insert(pageno);
}
auto new_page = added_page(pdf, to_copy);
// Try to avoid gratuitously renaming fields. In the case of where we're just extracting
// a bunch of pages from the original file and not copying any page more than once,
// there's no reason to do anything with the fields. Since we don't remove fields from
// the original file until all copy operations are completed, any foreign pages that
// conflict with original pages will be adjusted. If we copy any page from the original
// file more than once, that page would be in conflict with the previous copy of itself.
if ((!this_file && other_afdh->hasAcroForm()) || !first_copy_from_orig) {
if (!this_file) {
QTC::TC("qpdf", "QPDFJob copy fields not this file");
} else if (!first_copy_from_orig) {
QTC::TC("qpdf", "QPDFJob copy fields non-first from orig");
}
try {
this_afdh->fixCopiedAnnotations(
new_page, to_copy.getObjectHandle(), *other_afdh, &referenced_fields);
} catch (std::exception& e) {
pdf.warn(
qpdf_e_damaged_pdf,
"",
0,
("Exception caught while fixing copied annotations. This may be a qpdf "
"bug. " +
std::string("Exception: ") + e.what()));
}
}
}
if (cis) {
cis->stayOpen(false);
}
}
if (any_page_labels) {
QPDFObjectHandle page_labels = QPDFObjectHandle::newDictionary();
page_labels.replaceKey("/Nums", QPDFObjectHandle::newArray(new_labels));
pdf.getRoot().replaceKey("/PageLabels", page_labels);
}
// Delete page objects for unused page in primary. This prevents those objects from being
// preserved by being referred to from other places, such as the outlines dictionary. Also make
// sure we keep form fields from pages we preserved.
for (size_t pageno = 0; pageno < orig_pages.size(); ++pageno) {
auto page = orig_pages.at(pageno);
if (selected_from_orig.count(QIntC::to_int(pageno))) {
for (auto field: this_afdh->getFormFieldsForPage(page)) {
QTC::TC("qpdf", "QPDFJob pages keeping field from original");
referenced_fields.insert(field.getObjectHandle().getObjGen());
}
} else {
pdf.replaceObject(page.getObjectHandle().getObjGen(), QPDFObjectHandle::newNull());
}
}
// Remove unreferenced form fields
if (this_afdh->hasAcroForm()) {
auto acroform = pdf.getRoot().getKey("/AcroForm");
auto fields = acroform.getKey("/Fields");
if (fields.isArray()) {
auto new_fields = QPDFObjectHandle::newArray();
if (fields.isIndirect()) {
new_fields = pdf.makeIndirectObject(new_fields);
}
for (auto const& field: fields.aitems()) {
if (referenced_fields.count(field.getObjGen())) {
new_fields.appendItem(field);
}
}
if (new_fields.getArrayNItems() > 0) {
QTC::TC("qpdf", "QPDFJob keep some fields in pages");
acroform.replaceKey("/Fields", new_fields);
} else {
QTC::TC("qpdf", "QPDFJob no more fields in pages");
pdf.getRoot().removeKey("/AcroForm");
}
}
}
}
void
QPDFJob::handleRotations(QPDF& pdf)
{
QPDFPageDocumentHelper dh(pdf);
std::vector<QPDFPageObjectHelper> pages = dh.getAllPages();
int npages = QIntC::to_int(pages.size());
for (auto const& iter: m->rotations) {
std::string const& range = iter.first;
QPDFJob::RotationSpec const& rspec = iter.second;
// range has been previously validated
for (int pageno_iter: QUtil::parse_numrange(range.c_str(), npages)) {
int pageno = pageno_iter - 1;
if ((pageno >= 0) && (pageno < npages)) {
pages.at(QIntC::to_size(pageno)).rotatePage(rspec.angle, rspec.relative);
}
}
}
}
void
QPDFJob::maybeFixWritePassword(int R, std::string& password)
{
switch (m->password_mode) {
case QPDFJob::pm_bytes:
QTC::TC("qpdf", "QPDFJob password mode bytes");
break;
case QPDFJob::pm_hex_bytes:
QTC::TC("qpdf", "QPDFJob password mode hex-bytes");
password = QUtil::hex_decode(password);
break;
case QPDFJob::pm_unicode:
case QPDFJob::pm_auto:
{
bool has_8bit_chars;
bool is_valid_utf8;
bool is_utf16;
QUtil::analyze_encoding(password, has_8bit_chars, is_valid_utf8, is_utf16);
if (!has_8bit_chars) {
return;
}
if (m->password_mode == QPDFJob::pm_unicode) {
if (!is_valid_utf8) {
QTC::TC("qpdf", "QPDFJob password not unicode");
throw std::runtime_error("supplied password is not valid UTF-8");
}
if (R < 5) {
std::string encoded;
if (!QUtil::utf8_to_pdf_doc(password, encoded)) {
QTC::TC("qpdf", "QPDFJob password not encodable");
throw std::runtime_error("supplied password cannot be encoded for 40-bit "
"or 128-bit encryption formats");
}
password = encoded;
}
} else {
if ((R < 5) && is_valid_utf8) {
std::string encoded;
if (QUtil::utf8_to_pdf_doc(password, encoded)) {
QTC::TC("qpdf", "QPDFJob auto-encode password");
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix
<< ": automatically converting Unicode password to single-byte "
"encoding as required for 40-bit or 128-bit encryption\n";
});
password = encoded;
} else {
QTC::TC("qpdf", "QPDFJob bytes fallback warning");
*m->log->getError()
<< m->message_prefix
<< ": WARNING: supplied password looks like a Unicode password with "
"characters not allowed in passwords for 40-bit and 128-bit "
"encryption; most readers will not be able to open this file with "
"the supplied password. (Use --password-mode=bytes to suppress this "
"warning and use the password anyway.)\n";
}
} else if ((R >= 5) && (!is_valid_utf8)) {
QTC::TC("qpdf", "QPDFJob invalid utf-8 in auto");
throw std::runtime_error(
"supplied password is not a valid Unicode password, which is required for "
"256-bit encryption; to really use this password, rerun with the "
"--password-mode=bytes option");
}
}
}
break;
}
}
void
QPDFJob::setEncryptionOptions(QPDFWriter& w)
{
int R = 0;
if (m->keylen == 40) {
R = 2;
} else if (m->keylen == 128) {
if (m->force_V4 || m->cleartext_metadata || m->use_aes) {
R = 4;
} else {
R = 3;
}
} else if (m->keylen == 256) {
if (m->force_R5) {
R = 5;
} else {
R = 6;
}
} else {
throw std::logic_error("bad encryption keylen");
}
if ((R > 3) && (m->r3_accessibility == false)) {
*m->log->getError() << m->message_prefix << ": -accessibility=n is ignored for modern"
<< " encryption formats\n";
}
maybeFixWritePassword(R, m->user_password);
maybeFixWritePassword(R, m->owner_password);
if ((R < 4) || ((R == 4) && (!m->use_aes))) {
if (!m->allow_weak_crypto) {
QTC::TC("qpdf", "QPDFJob weak crypto error");
*m->log->getError()
<< m->message_prefix
<< ": refusing to write a file with RC4, a weak cryptographic algorithm\n"
"Please use 256-bit keys for better security.\n"
"Pass --allow-weak-crypto to enable writing insecure files.\n"
"See also https://qpdf.readthedocs.io/en/stable/weak-crypto.html\n";
throw std::runtime_error("refusing to write a file with weak crypto");
}
}
switch (R) {
case 2:
w.setR2EncryptionParametersInsecure(
m->user_password.c_str(),
m->owner_password.c_str(),
m->r2_print,
m->r2_modify,
m->r2_extract,
m->r2_annotate);
break;
case 3:
w.setR3EncryptionParametersInsecure(
m->user_password.c_str(),
m->owner_password.c_str(),
m->r3_accessibility,
m->r3_extract,
m->r3_assemble,
m->r3_annotate_and_form,
m->r3_form_filling,
m->r3_modify_other,
m->r3_print);
break;
case 4:
w.setR4EncryptionParametersInsecure(
m->user_password.c_str(),
m->owner_password.c_str(),
m->r3_accessibility,
m->r3_extract,
m->r3_assemble,
m->r3_annotate_and_form,
m->r3_form_filling,
m->r3_modify_other,
m->r3_print,
!m->cleartext_metadata,
m->use_aes);
break;
case 5:
w.setR5EncryptionParameters(
m->user_password.c_str(),
m->owner_password.c_str(),
m->r3_accessibility,
m->r3_extract,
m->r3_assemble,
m->r3_annotate_and_form,
m->r3_form_filling,
m->r3_modify_other,
m->r3_print,
!m->cleartext_metadata);
break;
case 6:
w.setR6EncryptionParameters(
m->user_password.c_str(),
m->owner_password.c_str(),
m->r3_accessibility,
m->r3_extract,
m->r3_assemble,
m->r3_annotate_and_form,
m->r3_form_filling,
m->r3_modify_other,
m->r3_print,
!m->cleartext_metadata);
break;
default:
throw std::logic_error("bad encryption R value");
break;
}
}
static void
parse_version(std::string const& full_version_string, std::string& version, int& extension_level)
{
auto vp = QUtil::make_unique_cstr(full_version_string);
char* v = vp.get();
char* p1 = strchr(v, '.');
char* p2 = (p1 ? strchr(1 + p1, '.') : nullptr);
if (p2 && *(p2 + 1)) {
*p2++ = '\0';
extension_level = QUtil::string_to_int(p2);
}
version = v;
}
void
QPDFJob::setWriterOptions(QPDFWriter& w)
{
if (m->compression_level >= 0) {
Pl_Flate::setCompressionLevel(m->compression_level);
}
if (m->qdf_mode) {
w.setQDFMode(true);
}
if (m->preserve_unreferenced_objects) {
w.setPreserveUnreferencedObjects(true);
}
if (m->newline_before_endstream) {
w.setNewlineBeforeEndstream(true);
}
if (m->normalize_set) {
w.setContentNormalization(m->normalize);
}
if (m->stream_data_set) {
w.setStreamDataMode(m->stream_data_mode);
}
if (m->compress_streams_set) {
w.setCompressStreams(m->compress_streams);
}
if (m->recompress_flate_set) {
w.setRecompressFlate(m->recompress_flate);
}
if (m->decode_level_set) {
w.setDecodeLevel(m->decode_level);
}
if (m->decrypt) {
w.setPreserveEncryption(false);
}
if (m->deterministic_id) {
w.setDeterministicID(true);
}
if (m->static_id) {
w.setStaticID(true);
}
if (m->static_aes_iv) {
w.setStaticAesIV(true);
}
if (m->suppress_original_object_id) {
w.setSuppressOriginalObjectIDs(true);
}
if (m->copy_encryption) {
std::unique_ptr<QPDF> encryption_pdf;
processFile(
encryption_pdf,
m->encryption_file.c_str(),
m->encryption_file_password.get(),
false,
false);
w.copyEncryptionParameters(*encryption_pdf);
}
if (m->encrypt) {
setEncryptionOptions(w);
}
if (m->linearize) {
w.setLinearization(true);
}
if (!m->linearize_pass1.empty()) {
w.setLinearizationPass1Filename(m->linearize_pass1);
}
if (m->object_stream_set) {
w.setObjectStreamMode(m->object_stream_mode);
}
w.setMinimumPDFVersion(m->max_input_version);
if (!m->min_version.empty()) {
std::string version;
int extension_level = 0;
parse_version(m->min_version, version, extension_level);
w.setMinimumPDFVersion(version, extension_level);
}
if (!m->force_version.empty()) {
std::string version;
int extension_level = 0;
parse_version(m->force_version, version, extension_level);
w.forcePDFVersion(version, extension_level);
}
if (m->progress) {
if (m->progress_handler) {
w.registerProgressReporter(std::shared_ptr<QPDFWriter::ProgressReporter>(
new QPDFWriter::FunctionProgressReporter(m->progress_handler)));
} else {
char const* outfilename = m->outfilename ? m->outfilename.get() : "standard output";
w.registerProgressReporter(std::shared_ptr<QPDFWriter::ProgressReporter>(
// line-break
new ProgressReporter(*m->log->getInfo(), m->message_prefix, outfilename)));
}
}
}
void
QPDFJob::doSplitPages(QPDF& pdf)
{
// Generate output file pattern
std::string before;
std::string after;
size_t len = strlen(m->outfilename.get());
char* num_spot = strstr(const_cast<char*>(m->outfilename.get()), "%d");
if (num_spot != nullptr) {
QTC::TC("qpdf", "QPDFJob split-pages %d");
before = std::string(m->outfilename.get(), QIntC::to_size(num_spot - m->outfilename.get()));
after = num_spot + 2;
} else if (
(len >= 4) && (QUtil::str_compare_nocase(m->outfilename.get() + len - 4, ".pdf") == 0)) {
QTC::TC("qpdf", "QPDFJob split-pages .pdf");
before = std::string(m->outfilename.get(), len - 4) + "-";
after = m->outfilename.get() + len - 4;
} else {
QTC::TC("qpdf", "QPDFJob split-pages other");
before = std::string(m->outfilename.get()) + "-";
}
if (shouldRemoveUnreferencedResources(pdf)) {
QPDFPageDocumentHelper dh(pdf);
dh.removeUnreferencedResources();
}
QPDFPageLabelDocumentHelper pldh(pdf);
QPDFAcroFormDocumentHelper afdh(pdf);
std::vector<QPDFObjectHandle> const& pages = pdf.getAllPages();
size_t pageno_len = std::to_string(pages.size()).length();
size_t num_pages = pages.size();
for (size_t i = 0; i < num_pages; i += QIntC::to_size(m->split_pages)) {
size_t first = i + 1;
size_t last = i + QIntC::to_size(m->split_pages);
if (last > num_pages) {
last = num_pages;
}
QPDF outpdf;
outpdf.emptyPDF();
std::shared_ptr<QPDFAcroFormDocumentHelper> out_afdh;
if (afdh.hasAcroForm()) {
out_afdh = std::make_shared<QPDFAcroFormDocumentHelper>(outpdf);
}
if (m->suppress_warnings) {
outpdf.setSuppressWarnings(true);
}
for (size_t pageno = first; pageno <= last; ++pageno) {
QPDFObjectHandle page = pages.at(pageno - 1);
outpdf.addPage(page, false);
auto new_page = added_page(outpdf, page);
if (out_afdh.get()) {
QTC::TC("qpdf", "QPDFJob copy form fields in split_pages");
try {
out_afdh->fixCopiedAnnotations(new_page, page, afdh);
} catch (std::exception& e) {
pdf.warn(
qpdf_e_damaged_pdf,
"",
0,
("Exception caught while fixing copied annotations. This may be a qpdf "
"bug." +
std::string("Exception: ") + e.what()));
}
}
}
if (pldh.hasPageLabels()) {
std::vector<QPDFObjectHandle> labels;
pldh.getLabelsForPageRange(
QIntC::to_longlong(first - 1), QIntC::to_longlong(last - 1), 0, labels);
QPDFObjectHandle page_labels = QPDFObjectHandle::newDictionary();
page_labels.replaceKey("/Nums", QPDFObjectHandle::newArray(labels));
outpdf.getRoot().replaceKey("/PageLabels", page_labels);
}
std::string page_range = QUtil::uint_to_string(first, QIntC::to_int(pageno_len));
if (m->split_pages > 1) {
page_range += "-" + QUtil::uint_to_string(last, QIntC::to_int(pageno_len));
}
std::string outfile = before + page_range + after;
if (QUtil::same_file(m->infilename.get(), outfile.c_str())) {
throw std::runtime_error("split pages would overwrite input file with " + outfile);
}
QPDFWriter w(outpdf, outfile.c_str());
setWriterOptions(w);
w.write();
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix << ": wrote file " << outfile << "\n";
});
}
}
void
QPDFJob::writeOutfile(QPDF& pdf)
{
std::shared_ptr<char> temp_out;
if (m->replace_input) {
// Append but don't prepend to the path to generate a temporary name. This saves us from
// having to split the path by directory and non-directory.
temp_out = QUtil::make_shared_cstr(std::string(m->infilename.get()) + ".~qpdf-temp#");
// m->outfilename will be restored to 0 before temp_out goes out of scope.
m->outfilename = temp_out;
} else if (strcmp(m->outfilename.get(), "-") == 0) {
m->outfilename = nullptr;
}
if (m->json_version) {
writeJSON(pdf);
} else {
// QPDFWriter must have block scope so the output file will be closed after write()
// finishes.
QPDFWriter w(pdf);
if (m->outfilename) {
w.setOutputFilename(m->outfilename.get());
} else {
// saveToStandardOutput has already been called, but calling it again is defensive and
// harmless.
m->log->saveToStandardOutput(true);
w.setOutputPipeline(m->log->getSave().get());
}
setWriterOptions(w);
w.write();
}
if (m->outfilename) {
doIfVerbose([&](Pipeline& v, std::string const& prefix) {
v << prefix << ": wrote file " << m->outfilename.get() << "\n";
});
}
if (m->replace_input) {
m->outfilename = nullptr;
}
if (m->replace_input) {
// We must close the input before we can rename files
pdf.closeInputSource();
std::string backup = std::string(m->infilename.get()) + ".~qpdf-orig";
bool warnings = pdf.anyWarnings();
if (!warnings) {
backup.append(1, '#');
}
QUtil::rename_file(m->infilename.get(), backup.c_str());
QUtil::rename_file(temp_out.get(), m->infilename.get());
if (warnings) {
*m->log->getError() << m->message_prefix
<< ": there are warnings; original file kept in " << backup << "\n";
} else {
try {
QUtil::remove_file(backup.c_str());
} catch (QPDFSystemError& e) {
*m->log->getError() << m->message_prefix << ": unable to delete original file ("
<< e.what() << ");" << " original file left in " << backup
<< ", but the input was successfully replaced\n";
}
}
}
}
void
QPDFJob::writeJSON(QPDF& pdf)
{
// File pipeline must have block scope so it will be closed after write.
std::shared_ptr<QUtil::FileCloser> fc;
std::shared_ptr<Pipeline> fp;
if (m->outfilename.get()) {
QTC::TC("qpdf", "QPDFJob write json to file");
if (m->json_stream_prefix.empty()) {
m->json_stream_prefix = m->outfilename.get();
}
fc = std::make_shared<QUtil::FileCloser>(QUtil::safe_fopen(m->outfilename.get(), "w"));
fp = std::make_shared<Pl_StdioFile>("json output", fc->f);
} else if ((m->json_stream_data == qpdf_sj_file) && m->json_stream_prefix.empty()) {
QTC::TC("qpdf", "QPDFJob need json-stream-prefix for stdout");
usage("please specify --json-stream-prefix since the input file "
"name is unknown");
} else {
QTC::TC("qpdf", "QPDFJob write json to stdout");
m->log->saveToStandardOutput(true);
fp = m->log->getSave();
}
doJSON(pdf, fp.get());
}
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