qpdf/libqpdf/qpdf-c.cc

#include <qpdf/qpdf-c.h>

#include <qpdf/QPDF.hh>

#include <qpdf/BufferInputSource.hh>
#include <qpdf/Pl_Buffer.hh>
#include <qpdf/Pl_Discard.hh>
#include <qpdf/Pl_Function.hh>
#include <qpdf/QIntC.hh>
#include <qpdf/QPDFExc.hh>
#include <qpdf/QPDFLogger.hh>
#include <qpdf/QPDFWriter.hh>
#include <qpdf/QTC.hh>
#include <qpdf/QUtil.hh>
#include <qpdf/qpdf-c_impl.hh>
#include <qpdf/qpdflogger-c_impl.hh>

#include <functional>
#include <list>
#include <stdexcept>
#include <string>

// must set qpdf->filename and qpdf->password
static void
call_read(qpdf_data qpdf)
{
    qpdf->qpdf->processFile(qpdf->filename, qpdf->password);
}

// must set qpdf->filename, qpdf->buffer, qpdf->size, and qpdf->password
static void
call_read_memory(qpdf_data qpdf)
{
    qpdf->qpdf->processMemoryFile(
        qpdf->filename, qpdf->buffer, QIntC::to_size(qpdf->size), qpdf->password);
}

// must set qpdf->filename
static void
call_init_write(qpdf_data qpdf)
{
    qpdf->qpdf_writer = std::make_shared<QPDFWriter>(*(qpdf->qpdf), qpdf->filename);
}

static void
call_init_write_memory(qpdf_data qpdf)
{
    qpdf->qpdf_writer = std::make_shared<QPDFWriter>(*(qpdf->qpdf));
    qpdf->qpdf_writer->setOutputMemory();
}

static void
call_write(qpdf_data qpdf)
{
    qpdf->qpdf_writer->write();
}

static void
call_check(qpdf_data qpdf)
{
    QPDFWriter w(*qpdf->qpdf);
    Pl_Discard discard;
    w.setOutputPipeline(&discard);
    w.setDecodeLevel(qpdf_dl_all);
    w.write();
}

static QPDF_ERROR_CODE
trap_errors(qpdf_data qpdf, std::function<void(qpdf_data)> fn)
{
    QPDF_ERROR_CODE status = QPDF_SUCCESS;
    try {
        fn(qpdf);
    } catch (QPDFExc& e) {
        qpdf->error = std::make_shared<QPDFExc>(e);
        status |= QPDF_ERRORS;
    } catch (std::runtime_error& e) {
        qpdf->error = std::make_shared<QPDFExc>(qpdf_e_system, "", "", 0, e.what());
        status |= QPDF_ERRORS;
    } catch (std::exception& e) {
        qpdf->error = std::make_shared<QPDFExc>(qpdf_e_internal, "", "", 0, e.what());
        status |= QPDF_ERRORS;
    }

    if (qpdf_more_warnings(qpdf)) {
        status |= QPDF_WARNINGS;
    }
    return status;
}

char const*
qpdf_get_qpdf_version()
{
    QTC::TC("qpdf", "qpdf-c called qpdf_get_qpdf_version");
    // The API guarantees that this is a static value.
    return QPDF::QPDFVersion().c_str();
}

qpdf_data
qpdf_init()
{
    QTC::TC("qpdf", "qpdf-c called qpdf_init");
    auto qpdf = new _qpdf_data();
    qpdf->qpdf = QPDF::create();
    return qpdf;
}

void
qpdf_cleanup(qpdf_data* qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_cleanup");
    qpdf_oh_release_all(*qpdf);
    if ((*qpdf)->error.get()) {
        QTC::TC("qpdf", "qpdf-c cleanup warned about unhandled error");
        *QPDFLogger::defaultLogger()->getWarn()
            << "WARNING: application did not handle error: " << (*qpdf)->error->what() << "\n";
    }
    delete *qpdf;
    *qpdf = nullptr;
}

size_t
qpdf_get_last_string_length(qpdf_data qpdf)
{
    return qpdf->tmp_string.length();
}

QPDF_BOOL
qpdf_more_warnings(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_more_warnings");

    if (qpdf->warnings.empty()) {
        std::vector<QPDFExc> w = qpdf->qpdf->getWarnings();
        if (!w.empty()) {
            qpdf->warnings.assign(w.begin(), w.end());
        }
    }
    if (qpdf->warnings.empty()) {
        return QPDF_FALSE;
    } else {
        return QPDF_TRUE;
    }
}

QPDF_BOOL
qpdf_has_error(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_has_error");
    return (qpdf->error.get() ? QPDF_TRUE : QPDF_FALSE);
}

qpdf_error
qpdf_get_error(qpdf_data qpdf)
{
    if (qpdf->error.get()) {
        qpdf->tmp_error.exc = qpdf->error;
        qpdf->error = nullptr;
        QTC::TC("qpdf", "qpdf-c qpdf_get_error returned error");
        return &qpdf->tmp_error;
    } else {
        return nullptr;
    }
}

qpdf_error
qpdf_next_warning(qpdf_data qpdf)
{
    if (qpdf_more_warnings(qpdf)) {
        qpdf->tmp_error.exc = std::make_shared<QPDFExc>(qpdf->warnings.front());
        qpdf->warnings.pop_front();
        QTC::TC("qpdf", "qpdf-c qpdf_next_warning returned warning");
        return &qpdf->tmp_error;
    } else {
        return nullptr;
    }
}

char const*
qpdf_get_error_full_text(qpdf_data qpdf, qpdf_error e)
{
    if (e == nullptr) {
        return "";
    }
    return e->exc->what();
}

enum qpdf_error_code_e
qpdf_get_error_code(qpdf_data qpdf, qpdf_error e)
{
    if (e == nullptr) {
        return qpdf_e_success;
    }
    return e->exc->getErrorCode();
}

char const*
qpdf_get_error_filename(qpdf_data qpdf, qpdf_error e)
{
    if (e == nullptr) {
        return "";
    }
    return e->exc->getFilename().c_str();
}

unsigned long long
qpdf_get_error_file_position(qpdf_data qpdf, qpdf_error e)
{
    if (e == nullptr) {
        return 0;
    }
    return QIntC::to_ulonglong(e->exc->getFilePosition());
}

char const*
qpdf_get_error_message_detail(qpdf_data qpdf, qpdf_error e)
{
    if (e == nullptr) {
        return "";
    }
    return e->exc->getMessageDetail().c_str();
}

QPDF_ERROR_CODE
qpdf_check_pdf(qpdf_data qpdf)
{
    QPDF_ERROR_CODE status = trap_errors(qpdf, &call_check);
    QTC::TC("qpdf", "qpdf-c called qpdf_check_pdf");
    return status;
}

void
qpdf_set_logger(qpdf_data qpdf, qpdflogger_handle logger)
{
    qpdf->qpdf->setLogger(logger->l);
}

qpdflogger_handle
qpdf_get_logger(qpdf_data qpdf)
{
    return new _qpdflogger_handle(qpdf->qpdf->getLogger());
}

void
qpdf_set_suppress_warnings(qpdf_data qpdf, QPDF_BOOL value)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_suppress_warnings");
    qpdf->qpdf->setSuppressWarnings(value != QPDF_FALSE);
}

void
qpdf_set_ignore_xref_streams(qpdf_data qpdf, QPDF_BOOL value)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_ignore_xref_streams");
    qpdf->qpdf->setIgnoreXRefStreams(value != QPDF_FALSE);
}

void
qpdf_set_attempt_recovery(qpdf_data qpdf, QPDF_BOOL value)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_attempt_recovery");
    qpdf->qpdf->setAttemptRecovery(value != QPDF_FALSE);
}

QPDF_ERROR_CODE
qpdf_read(qpdf_data qpdf, char const* filename, char const* password)
{
    QPDF_ERROR_CODE status = QPDF_SUCCESS;
    qpdf->filename = filename;
    qpdf->password = password;
    status = trap_errors(qpdf, &call_read);
    // We no longer have a good way to exercise a file with both warnings and errors because qpdf is
    // getting much better at recovering.
    QTC::TC(
        "qpdf",
        "qpdf-c called qpdf_read",
        (status == 0)                  ? 0
            : (status & QPDF_WARNINGS) ? 1
            : (status & QPDF_ERRORS)   ? 2
                                       : -1);
    return status;
}

QPDF_ERROR_CODE
qpdf_read_memory(
    qpdf_data qpdf,
    char const* description,
    char const* buffer,
    unsigned long long size,
    char const* password)
{
    QPDF_ERROR_CODE status = QPDF_SUCCESS;
    qpdf->filename = description;
    qpdf->buffer = buffer;
    qpdf->size = size;
    qpdf->password = password;
    status = trap_errors(qpdf, &call_read_memory);
    QTC::TC("qpdf", "qpdf-c called qpdf_read_memory", status);
    return status;
}

QPDF_ERROR_CODE
qpdf_empty_pdf(qpdf_data qpdf)
{
    qpdf->filename = "empty PDF";
    qpdf->qpdf->emptyPDF();
    QTC::TC("qpdf", "qpdf-c called qpdf_empty_pdf");
    return QPDF_SUCCESS;
}

char const*
qpdf_get_pdf_version(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_get_pdf_version");
    qpdf->tmp_string = qpdf->qpdf->getPDFVersion();
    return qpdf->tmp_string.c_str();
}

int
qpdf_get_pdf_extension_level(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_get_pdf_extension_level");
    return qpdf->qpdf->getExtensionLevel();
}

char const*
qpdf_get_user_password(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_get_user_password");
    qpdf->tmp_string = qpdf->qpdf->getTrimmedUserPassword();
    return qpdf->tmp_string.c_str();
}

char const*
qpdf_get_info_key(qpdf_data qpdf, char const* key)
{
    char const* result = nullptr;
    QPDFObjectHandle trailer = qpdf->qpdf->getTrailer();
    if (trailer.hasKey("/Info")) {
        QPDFObjectHandle info = trailer.getKey("/Info");
        if (info.hasKey(key)) {
            QPDFObjectHandle value = info.getKey(key);
            if (value.isString()) {
                qpdf->tmp_string = value.getStringValue();
                result = qpdf->tmp_string.c_str();
            }
        }
    }
    QTC::TC("qpdf", "qpdf-c get_info_key", (result == nullptr ? 0 : 1));
    return result;
}

void
qpdf_set_info_key(qpdf_data qpdf, char const* key, char const* value)
{
    if ((key == nullptr) || (std::strlen(key) == 0) || (key[0] != '/')) {
        return;
    }
    QPDFObjectHandle value_object;
    if (value) {
        QTC::TC("qpdf", "qpdf-c set_info_key to value");
        value_object = QPDFObjectHandle::newString(value);
    } else {
        QTC::TC("qpdf", "qpdf-c set_info_key to null");
        value_object = QPDFObjectHandle::newNull();
    }

    QPDFObjectHandle trailer = qpdf->qpdf->getTrailer();
    if (!trailer.hasKey("/Info")) {
        QTC::TC("qpdf", "qpdf-c add info to trailer");
        trailer.replaceKey(
            "/Info", qpdf->qpdf->makeIndirectObject(QPDFObjectHandle::newDictionary()));
    } else {
        QTC::TC("qpdf", "qpdf-c set-info-key use existing info");
    }

    QPDFObjectHandle info = trailer.getKey("/Info");
    info.replaceKey(key, value_object);
}

QPDF_BOOL
qpdf_is_linearized(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_is_linearized");
    return (qpdf->qpdf->isLinearized() ? QPDF_TRUE : QPDF_FALSE);
}

QPDF_BOOL
qpdf_is_encrypted(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_is_encrypted");
    return (qpdf->qpdf->isEncrypted() ? QPDF_TRUE : QPDF_FALSE);
}

QPDF_BOOL
qpdf_allow_accessibility(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_allow_accessibility");
    return (qpdf->qpdf->allowAccessibility() ? QPDF_TRUE : QPDF_FALSE);
}

QPDF_BOOL
qpdf_allow_extract_all(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_allow_extract_all");
    return (qpdf->qpdf->allowExtractAll() ? QPDF_TRUE : QPDF_FALSE);
}

QPDF_BOOL
qpdf_allow_print_low_res(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_allow_print_low_res");
    return (qpdf->qpdf->allowPrintLowRes() ? QPDF_TRUE : QPDF_FALSE);
}

QPDF_BOOL
qpdf_allow_print_high_res(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_allow_print_high_res");
    return (qpdf->qpdf->allowPrintHighRes() ? QPDF_TRUE : QPDF_FALSE);
}

QPDF_BOOL
qpdf_allow_modify_assembly(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_allow_modify_assembly");
    return (qpdf->qpdf->allowModifyAssembly() ? QPDF_TRUE : QPDF_FALSE);
}

QPDF_BOOL
qpdf_allow_modify_form(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_allow_modify_form");
    return (qpdf->qpdf->allowModifyForm() ? QPDF_TRUE : QPDF_FALSE);
}

QPDF_BOOL
qpdf_allow_modify_annotation(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_allow_modify_annotation");
    return (qpdf->qpdf->allowModifyAnnotation() ? QPDF_TRUE : QPDF_FALSE);
}

QPDF_BOOL
qpdf_allow_modify_other(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_allow_modify_other");
    return (qpdf->qpdf->allowModifyOther() ? QPDF_TRUE : QPDF_FALSE);
}

QPDF_BOOL
qpdf_allow_modify_all(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_allow_modify_all");
    return (qpdf->qpdf->allowModifyAll() ? QPDF_TRUE : QPDF_FALSE);
}

static void
qpdf_init_write_internal(qpdf_data qpdf)
{
    if (qpdf->qpdf_writer.get()) {
        QTC::TC("qpdf", "qpdf-c called qpdf_init_write multiple times");
        qpdf->qpdf_writer = nullptr;
        if (qpdf->output_buffer.get()) {
            qpdf->output_buffer = nullptr;
            qpdf->write_memory = false;
            qpdf->filename = nullptr;
        }
    }
}

QPDF_ERROR_CODE
qpdf_init_write(qpdf_data qpdf, char const* filename)
{
    qpdf_init_write_internal(qpdf);
    qpdf->filename = filename;
    QPDF_ERROR_CODE status = trap_errors(qpdf, &call_init_write);
    QTC::TC("qpdf", "qpdf-c called qpdf_init_write", status);
    return status;
}

QPDF_ERROR_CODE
qpdf_init_write_memory(qpdf_data qpdf)
{
    qpdf_init_write_internal(qpdf);
    QPDF_ERROR_CODE status = trap_errors(qpdf, &call_init_write_memory);
    QTC::TC("qpdf", "qpdf-c called qpdf_init_write_memory");
    qpdf->write_memory = true;
    return status;
}

static void
qpdf_get_buffer_internal(qpdf_data qpdf)
{
    if (qpdf->write_memory && (qpdf->output_buffer == nullptr)) {
        qpdf->output_buffer = qpdf->qpdf_writer->getBufferSharedPointer();
    }
}

size_t
qpdf_get_buffer_length(qpdf_data qpdf)
{
    qpdf_get_buffer_internal(qpdf);
    size_t result = 0;
    if (qpdf->output_buffer.get()) {
        result = qpdf->output_buffer->getSize();
    }
    return result;
}

unsigned char const*
qpdf_get_buffer(qpdf_data qpdf)
{
    unsigned char const* result = nullptr;
    qpdf_get_buffer_internal(qpdf);
    if (qpdf->output_buffer.get()) {
        result = qpdf->output_buffer->getBuffer();
    }
    return result;
}

void
qpdf_set_object_stream_mode(qpdf_data qpdf, qpdf_object_stream_e mode)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_object_stream_mode");
    qpdf->qpdf_writer->setObjectStreamMode(mode);
}

void
qpdf_set_compress_streams(qpdf_data qpdf, QPDF_BOOL value)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_compress_streams");
    qpdf->qpdf_writer->setCompressStreams(value != QPDF_FALSE);
}

void
qpdf_set_decode_level(qpdf_data qpdf, qpdf_stream_decode_level_e level)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_decode_level");
    qpdf->qpdf_writer->setDecodeLevel(level);
}

void
qpdf_set_preserve_unreferenced_objects(qpdf_data qpdf, QPDF_BOOL value)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_preserve_unreferenced_objects");
    qpdf->qpdf_writer->setPreserveUnreferencedObjects(value != QPDF_FALSE);
}

void
qpdf_set_newline_before_endstream(qpdf_data qpdf, QPDF_BOOL value)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_newline_before_endstream");
    qpdf->qpdf_writer->setNewlineBeforeEndstream(value != QPDF_FALSE);
}

void
qpdf_set_stream_data_mode(qpdf_data qpdf, qpdf_stream_data_e mode)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_stream_data_mode");
    qpdf->qpdf_writer->setStreamDataMode(mode);
}

void
qpdf_set_content_normalization(qpdf_data qpdf, QPDF_BOOL value)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_content_normalization");
    qpdf->qpdf_writer->setContentNormalization(value != QPDF_FALSE);
}

void
qpdf_set_qdf_mode(qpdf_data qpdf, QPDF_BOOL value)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_qdf_mode");
    qpdf->qpdf_writer->setQDFMode(value != QPDF_FALSE);
}

void
qpdf_set_deterministic_ID(qpdf_data qpdf, QPDF_BOOL value)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_deterministic_ID");
    qpdf->qpdf_writer->setDeterministicID(value != QPDF_FALSE);
}

void
qpdf_set_static_ID(qpdf_data qpdf, QPDF_BOOL value)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_static_ID");
    qpdf->qpdf_writer->setStaticID(value != QPDF_FALSE);
}

void
qpdf_set_static_aes_IV(qpdf_data qpdf, QPDF_BOOL value)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_static_aes_IV");
    qpdf->qpdf_writer->setStaticAesIV(value != QPDF_FALSE);
}

void
qpdf_set_suppress_original_object_IDs(qpdf_data qpdf, QPDF_BOOL value)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_suppress_original_object_IDs");
    qpdf->qpdf_writer->setSuppressOriginalObjectIDs(value != QPDF_FALSE);
}

void
qpdf_set_preserve_encryption(qpdf_data qpdf, QPDF_BOOL value)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_preserve_encryption");
    qpdf->qpdf_writer->setPreserveEncryption(value != QPDF_FALSE);
}

void
qpdf_set_r2_encryption_parameters_insecure(
    qpdf_data qpdf,
    char const* user_password,
    char const* owner_password,
    QPDF_BOOL allow_print,
    QPDF_BOOL allow_modify,
    QPDF_BOOL allow_extract,
    QPDF_BOOL allow_annotate)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_r2_encryption_parameters_insecure");
    qpdf->qpdf_writer->setR2EncryptionParametersInsecure(
        user_password,
        owner_password,
        allow_print != QPDF_FALSE,
        allow_modify != QPDF_FALSE,
        allow_extract != QPDF_FALSE,
        allow_annotate != QPDF_FALSE);
}

void
qpdf_set_r3_encryption_parameters_insecure(
    qpdf_data qpdf,
    char const* user_password,
    char const* owner_password,
    QPDF_BOOL allow_accessibility,
    QPDF_BOOL allow_extract,
    QPDF_BOOL allow_assemble,
    QPDF_BOOL allow_annotate_and_form,
    QPDF_BOOL allow_form_filling,
    QPDF_BOOL allow_modify_other,
    enum qpdf_r3_print_e print)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_r3_encryption_parameters_insecure");
    qpdf->qpdf_writer->setR3EncryptionParametersInsecure(
        user_password,
        owner_password,
        allow_accessibility != QPDF_FALSE,
        allow_extract != QPDF_FALSE,
        allow_assemble != QPDF_FALSE,
        allow_annotate_and_form != QPDF_FALSE,
        allow_form_filling != QPDF_FALSE,
        allow_modify_other != QPDF_FALSE,
        print);
}

void
qpdf_set_r4_encryption_parameters_insecure(
    qpdf_data qpdf,
    char const* user_password,
    char const* owner_password,
    QPDF_BOOL allow_accessibility,
    QPDF_BOOL allow_extract,
    QPDF_BOOL allow_assemble,
    QPDF_BOOL allow_annotate_and_form,
    QPDF_BOOL allow_form_filling,
    QPDF_BOOL allow_modify_other,
    enum qpdf_r3_print_e print,
    QPDF_BOOL encrypt_metadata,
    QPDF_BOOL use_aes)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_r4_encryption_parameters_insecure");
    qpdf->qpdf_writer->setR4EncryptionParametersInsecure(
        user_password,
        owner_password,
        allow_accessibility != QPDF_FALSE,
        allow_extract != QPDF_FALSE,
        allow_assemble != QPDF_FALSE,
        allow_annotate_and_form != QPDF_FALSE,
        allow_form_filling != QPDF_FALSE,
        allow_modify_other != QPDF_FALSE,
        print,
        encrypt_metadata != QPDF_FALSE,
        use_aes != QPDF_FALSE);
}

void
qpdf_set_r5_encryption_parameters2(
    qpdf_data qpdf,
    char const* user_password,
    char const* owner_password,
    QPDF_BOOL allow_accessibility,
    QPDF_BOOL allow_extract,
    QPDF_BOOL allow_assemble,
    QPDF_BOOL allow_annotate_and_form,
    QPDF_BOOL allow_form_filling,
    QPDF_BOOL allow_modify_other,
    enum qpdf_r3_print_e print,
    QPDF_BOOL encrypt_metadata)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_r5_encryption_parameters");
    qpdf->qpdf_writer->setR5EncryptionParameters(
        user_password,
        owner_password,
        allow_accessibility != QPDF_FALSE,
        allow_extract != QPDF_FALSE,
        allow_assemble != QPDF_FALSE,
        allow_annotate_and_form != QPDF_FALSE,
        allow_form_filling != QPDF_FALSE,
        allow_modify_other != QPDF_FALSE,
        print,
        encrypt_metadata != QPDF_FALSE);
}

void
qpdf_set_r6_encryption_parameters2(
    qpdf_data qpdf,
    char const* user_password,
    char const* owner_password,
    QPDF_BOOL allow_accessibility,
    QPDF_BOOL allow_extract,
    QPDF_BOOL allow_assemble,
    QPDF_BOOL allow_annotate_and_form,
    QPDF_BOOL allow_form_filling,
    QPDF_BOOL allow_modify_other,
    enum qpdf_r3_print_e print,
    QPDF_BOOL encrypt_metadata)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_r6_encryption_parameters");
    qpdf->qpdf_writer->setR6EncryptionParameters(
        user_password,
        owner_password,
        allow_accessibility != QPDF_FALSE,
        allow_extract != QPDF_FALSE,
        allow_assemble != QPDF_FALSE,
        allow_annotate_and_form != QPDF_FALSE,
        allow_form_filling != QPDF_FALSE,
        allow_modify_other != QPDF_FALSE,
        print,
        encrypt_metadata != QPDF_FALSE);
}

void
qpdf_set_linearization(qpdf_data qpdf, QPDF_BOOL value)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_linearization");
    qpdf->qpdf_writer->setLinearization(value != QPDF_FALSE);
}

void
qpdf_set_minimum_pdf_version(qpdf_data qpdf, char const* version)
{
    qpdf_set_minimum_pdf_version_and_extension(qpdf, version, 0);
}

void
qpdf_set_minimum_pdf_version_and_extension(qpdf_data qpdf, char const* version, int extension_level)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_set_minimum_pdf_version");
    qpdf->qpdf_writer->setMinimumPDFVersion(version, extension_level);
}

void
qpdf_force_pdf_version(qpdf_data qpdf, char const* version)
{
    qpdf_force_pdf_version_and_extension(qpdf, version, 0);
}

void
qpdf_force_pdf_version_and_extension(qpdf_data qpdf, char const* version, int extension_level)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_force_pdf_version");
    qpdf->qpdf_writer->forcePDFVersion(version, extension_level);
}

void
qpdf_register_progress_reporter(
    qpdf_data qpdf, void (*report_progress)(int percent, void* data), void* data)
{
    QTC::TC("qpdf", "qpdf-c registered progress reporter");
    qpdf->qpdf_writer->registerProgressReporter(
        std::shared_ptr<QPDFWriter::ProgressReporter>(new QPDFWriter::FunctionProgressReporter(
            std::bind(report_progress, std::placeholders::_1, data))));
}

QPDF_ERROR_CODE
qpdf_write(qpdf_data qpdf)
{
    QPDF_ERROR_CODE status = QPDF_SUCCESS;
    status = trap_errors(qpdf, &call_write);
    QTC::TC("qpdf", "qpdf-c called qpdf_write", (status == 0) ? 0 : 1);
    return status;
}

void
qpdf_silence_errors(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c silence oh errors");
    qpdf->silence_errors = true;
}

template <class RET>
static RET
trap_oh_errors(qpdf_data qpdf, std::function<RET()> fallback, std::function<RET(qpdf_data)> fn)
{
    // Note: fallback is a function so we don't have to evaluate it unless needed. This is important
    // because sometimes the fallback creates an object.
    RET ret;
    QPDF_ERROR_CODE status = trap_errors(qpdf, [&ret, fn](qpdf_data q) { ret = fn(q); });
    if (status & QPDF_ERRORS) {
        if (!qpdf->silence_errors) {
            QTC::TC("qpdf", "qpdf-c warn about oh error", qpdf->oh_error_occurred ? 0 : 1);
            if (!qpdf->oh_error_occurred) {
                qpdf->warnings.emplace_back(
                    qpdf_e_internal,
                    qpdf->qpdf->getFilename(),
                    "",
                    0,
                    "C API function caught an exception that it isn't returning; please point the "
                    "application developer to ERROR HANDLING in qpdf-c.h");
                qpdf->oh_error_occurred = true;
            }
            *QPDFLogger::defaultLogger()->getError() << qpdf->error->what() << "\n";
        }
        return fallback();
    }
    return ret;
}

static qpdf_oh
new_object(qpdf_data qpdf, QPDFObjectHandle const& qoh)
{
    qpdf_oh oh = ++qpdf->next_oh; // never return 0
    qpdf->oh_cache[oh] = std::make_shared<QPDFObjectHandle>(qoh);
    return oh;
}

qpdf_oh
qpdf_oh_new_object(qpdf_data qpdf, qpdf_oh oh)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_new_object");
    return new_object(qpdf, *(qpdf->oh_cache[oh]));
}

void
qpdf_oh_release(qpdf_data qpdf, qpdf_oh oh)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_release");
    qpdf->oh_cache.erase(oh);
}

void
qpdf_oh_release_all(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_release_all");
    qpdf->oh_cache.clear();
}

template <class T>
static std::function<T()>
return_T(T const& r)
{
    return [&r]() { return r; };
}

static QPDF_BOOL
return_false()
{
    return QPDF_FALSE;
}

static std::function<qpdf_oh()>
return_uninitialized(qpdf_data qpdf)
{
    return [qpdf]() { return qpdf_oh_new_uninitialized(qpdf); };
}

static std::function<qpdf_oh()>
return_null(qpdf_data qpdf)
{
    return [qpdf]() { return qpdf_oh_new_null(qpdf); };
}

qpdf_oh
qpdf_get_trailer(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_get_trailer");
    return trap_oh_errors<qpdf_oh>(qpdf, return_uninitialized(qpdf), [](qpdf_data q) {
        return new_object(q, q->qpdf->getTrailer());
    });
}

qpdf_oh
qpdf_get_root(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_get_root");
    return trap_oh_errors<qpdf_oh>(qpdf, return_uninitialized(qpdf), [](qpdf_data q) {
        return new_object(q, q->qpdf->getRoot());
    });
}

qpdf_oh
qpdf_get_object_by_id(qpdf_data qpdf, int objid, int generation)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_get_object_by_id");
    return new_object(qpdf, qpdf->qpdf->getObjectByID(objid, generation));
}

template <class RET>
static RET
do_with_oh(
    qpdf_data qpdf,
    qpdf_oh oh,
    std::function<RET()> fallback,
    std::function<RET(QPDFObjectHandle&)> fn)
{
    return trap_oh_errors<RET>(qpdf, fallback, [fn, oh](qpdf_data q) {
        auto i = q->oh_cache.find(oh);
        bool result = ((i != q->oh_cache.end()) && (i->second).get());
        if (!result) {
            QTC::TC("qpdf", "qpdf-c invalid object handle");
            throw QPDFExc(
                qpdf_e_internal,
                q->qpdf->getFilename(),
                std::string("C API object handle ") + std::to_string(oh),
                0,
                "attempted access to unknown object handle");
        }
        return fn(*(q->oh_cache[oh]));
    });
}

static void
do_with_oh_void(qpdf_data qpdf, qpdf_oh oh, std::function<void(QPDFObjectHandle&)> fn)
{
    do_with_oh<bool>(qpdf, oh, return_T<bool>(false), [fn](QPDFObjectHandle& o) {
        fn(o);
        return true; // unused
    });
}

void
qpdf_replace_object(qpdf_data qpdf, int objid, int generation, qpdf_oh oh)
{
    do_with_oh_void(qpdf, oh, [qpdf, objid, generation](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_replace_object");
        qpdf->qpdf->replaceObject(objid, generation, o);
    });
}

QPDF_BOOL
qpdf_oh_is_initialized(qpdf_data qpdf, qpdf_oh oh)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_is_initialized");
    return do_with_oh<QPDF_BOOL>(
        qpdf, oh, return_false, [](QPDFObjectHandle& o) { return static_cast<bool>(o); });
}

QPDF_BOOL
qpdf_oh_is_bool(qpdf_data qpdf, qpdf_oh oh)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_is_bool");
    return do_with_oh<QPDF_BOOL>(
        qpdf, oh, return_false, [](QPDFObjectHandle& o) { return o.isBool(); });
}

QPDF_BOOL
qpdf_oh_is_null(qpdf_data qpdf, qpdf_oh oh)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_is_null");
    return do_with_oh<QPDF_BOOL>(
        qpdf, oh, return_false, [](QPDFObjectHandle& o) { return o.isNull(); });
}

QPDF_BOOL
qpdf_oh_is_integer(qpdf_data qpdf, qpdf_oh oh)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_is_integer");
    return do_with_oh<QPDF_BOOL>(
        qpdf, oh, return_false, [](QPDFObjectHandle& o) { return o.isInteger(); });
}

QPDF_BOOL
qpdf_oh_is_real(qpdf_data qpdf, qpdf_oh oh)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_is_real");
    return do_with_oh<QPDF_BOOL>(
        qpdf, oh, return_false, [](QPDFObjectHandle& o) { return o.isReal(); });
}

QPDF_BOOL
qpdf_oh_is_name(qpdf_data qpdf, qpdf_oh oh)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_is_name");
    return do_with_oh<QPDF_BOOL>(
        qpdf, oh, return_false, [](QPDFObjectHandle& o) { return o.isName(); });
}

QPDF_BOOL
qpdf_oh_is_string(qpdf_data qpdf, qpdf_oh oh)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_is_string");
    return do_with_oh<QPDF_BOOL>(
        qpdf, oh, return_false, [](QPDFObjectHandle& o) { return o.isString(); });
}

QPDF_BOOL
qpdf_oh_is_operator(qpdf_data qpdf, qpdf_oh oh)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_is_operator");
    return do_with_oh<QPDF_BOOL>(
        qpdf, oh, return_false, [](QPDFObjectHandle& o) { return o.isOperator(); });
}

QPDF_BOOL
qpdf_oh_is_inline_image(qpdf_data qpdf, qpdf_oh oh)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_is_inline_image");
    return do_with_oh<QPDF_BOOL>(
        qpdf, oh, return_false, [](QPDFObjectHandle& o) { return o.isInlineImage(); });
}

QPDF_BOOL
qpdf_oh_is_array(qpdf_data qpdf, qpdf_oh oh)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_is_array");
    return do_with_oh<QPDF_BOOL>(
        qpdf, oh, return_false, [](QPDFObjectHandle& o) { return o.isArray(); });
}

QPDF_BOOL
qpdf_oh_is_dictionary(qpdf_data qpdf, qpdf_oh oh)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_is_dictionary");
    return do_with_oh<QPDF_BOOL>(
        qpdf, oh, return_false, [](QPDFObjectHandle& o) { return o.isDictionary(); });
}

QPDF_BOOL
qpdf_oh_is_stream(qpdf_data qpdf, qpdf_oh oh)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_is_stream");
    return do_with_oh<QPDF_BOOL>(
        qpdf, oh, return_false, [](QPDFObjectHandle& o) { return o.isStream(); });
}

QPDF_BOOL
qpdf_oh_is_indirect(qpdf_data qpdf, qpdf_oh oh)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_is_indirect");
    return do_with_oh<QPDF_BOOL>(
        qpdf, oh, return_false, [](QPDFObjectHandle& o) { return o.isIndirect(); });
}

QPDF_BOOL
qpdf_oh_is_scalar(qpdf_data qpdf, qpdf_oh oh)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_is_scalar");
    return do_with_oh<QPDF_BOOL>(
        qpdf, oh, return_false, [](QPDFObjectHandle& o) { return o.isScalar(); });
}

QPDF_BOOL
qpdf_oh_is_number(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<QPDF_BOOL>(qpdf, oh, return_false, [](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_is_number");
        return o.isNumber();
    });
}

QPDF_BOOL
qpdf_oh_is_name_and_equals(qpdf_data qpdf, qpdf_oh oh, char const* name)
{
    return do_with_oh<QPDF_BOOL>(qpdf, oh, return_false, [name](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_is_name_and_equals");
        return o.isNameAndEquals(name);
    });
}

QPDF_BOOL
qpdf_oh_is_dictionary_of_type(qpdf_data qpdf, qpdf_oh oh, char const* type, char const* subtype)
{
    auto stype = (subtype == nullptr) ? "" : subtype;
    return do_with_oh<QPDF_BOOL>(qpdf, oh, return_false, [type, stype](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_is_dictionary_of_type");
        return o.isDictionaryOfType(type, stype);
    });
}

qpdf_object_type_e
qpdf_oh_get_type_code(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<qpdf_object_type_e>(
        qpdf, oh, return_T<qpdf_object_type_e>(ot_uninitialized), [](QPDFObjectHandle& o) {
            QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_type_code");
            return o.getTypeCode();
        });
}

char const*
qpdf_oh_get_type_name(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<char const*>(
        qpdf, oh, return_T<char const*>(""), [qpdf](QPDFObjectHandle& o) {
            QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_type_name");
            qpdf->tmp_string = o.getTypeName();
            return qpdf->tmp_string.c_str();
        });
}

qpdf_oh
qpdf_oh_wrap_in_array(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<qpdf_oh>(
        qpdf,
        oh,
        [qpdf]() { return qpdf_oh_new_array(qpdf); },
        [qpdf](QPDFObjectHandle& qoh) {
            if (qoh.isArray()) {
                QTC::TC("qpdf", "qpdf-c array to wrap_in_array");
                return new_object(qpdf, qoh);
            } else {
                QTC::TC("qpdf", "qpdf-c non-array to wrap_in_array");
                return new_object(
                    qpdf, QPDFObjectHandle::newArray(std::vector<QPDFObjectHandle>{qoh}));
            }
        });
}

qpdf_oh
qpdf_oh_parse(qpdf_data qpdf, char const* object_str)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_parse");
    return trap_oh_errors<qpdf_oh>(qpdf, return_uninitialized(qpdf), [object_str](qpdf_data q) {
        return new_object(q, QPDFObjectHandle::parse(object_str));
    });
}

QPDF_BOOL
qpdf_oh_get_bool_value(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<QPDF_BOOL>(qpdf, oh, return_false, [](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_bool_value");
        return o.getBoolValue();
    });
}

QPDF_BOOL
qpdf_oh_get_value_as_bool(qpdf_data qpdf, qpdf_oh oh, QPDF_BOOL* value)
{
    return do_with_oh<QPDF_BOOL>(qpdf, oh, return_false, [value](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_value_as_bool");
        bool v = *value;
        QPDF_BOOL result = o.getValueAsBool(v);
        if (result) {
            *value = v;
        }
        return result;
    });
}

long long
qpdf_oh_get_int_value(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<long long>(qpdf, oh, return_T<long long>(0LL), [](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_int_value");
        return o.getIntValue();
    });
}

QPDF_BOOL
qpdf_oh_get_value_as_longlong(qpdf_data qpdf, qpdf_oh oh, long long* value)
{
    return do_with_oh<QPDF_BOOL>(qpdf, oh, return_false, [value](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_value_as_longlong");
        return o.getValueAsInt(*value);
    });
}

int
qpdf_oh_get_int_value_as_int(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<int>(qpdf, oh, return_T<int>(0), [](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_int_value_as_int");
        return o.getIntValueAsInt();
    });
}

QPDF_BOOL
qpdf_oh_get_value_as_int(qpdf_data qpdf, qpdf_oh oh, int* value)
{
    return do_with_oh<QPDF_BOOL>(qpdf, oh, return_false, [value](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_value_as_int");
        return o.getValueAsInt(*value);
    });
}

unsigned long long
qpdf_oh_get_uint_value(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<unsigned long long>(
        qpdf, oh, return_T<unsigned long long>(0ULL), [](QPDFObjectHandle& o) {
            QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_uint_value");
            return o.getUIntValue();
        });
}

QPDF_BOOL
qpdf_oh_get_value_as_ulonglong(qpdf_data qpdf, qpdf_oh oh, unsigned long long* value)
{
    return do_with_oh<QPDF_BOOL>(qpdf, oh, return_false, [value](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_value_as_ulonglong");
        return o.getValueAsUInt(*value);
    });
}

unsigned int
qpdf_oh_get_uint_value_as_uint(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<unsigned int>(qpdf, oh, return_T<unsigned int>(0U), [](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_uint_value_as_uint");
        return o.getUIntValueAsUInt();
    });
}

QPDF_BOOL
qpdf_oh_get_value_as_uint(qpdf_data qpdf, qpdf_oh oh, unsigned int* value)
{
    return do_with_oh<QPDF_BOOL>(qpdf, oh, return_false, [value](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_value_as_uint");
        return o.getValueAsUInt(*value);
    });
}

char const*
qpdf_oh_get_real_value(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<char const*>(
        qpdf, oh, return_T<char const*>(""), [qpdf](QPDFObjectHandle& o) {
            QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_real_value");
            qpdf->tmp_string = o.getRealValue();
            return qpdf->tmp_string.c_str();
        });
}

QPDF_BOOL
qpdf_oh_get_value_as_real(qpdf_data qpdf, qpdf_oh oh, char const** value, size_t* length)
{
    return do_with_oh<QPDF_BOOL>(
        qpdf, oh, return_false, [qpdf, value, length](QPDFObjectHandle& o) {
            QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_value_as_real");
            auto result = o.getValueAsReal(qpdf->tmp_string);
            if (result) {
                *value = qpdf->tmp_string.c_str();
                *length = qpdf->tmp_string.length();
            }
            return result;
        });
}

double
qpdf_oh_get_numeric_value(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<double>(qpdf, oh, return_T<double>(0.0), [](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_numeric_value");
        return o.getNumericValue();
    });
}

QPDF_BOOL
qpdf_oh_get_value_as_number(qpdf_data qpdf, qpdf_oh oh, double* value)
{
    return do_with_oh<QPDF_BOOL>(qpdf, oh, return_false, [value](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_value_as_number");
        return o.getValueAsNumber(*value);
    });
}

char const*
qpdf_oh_get_name(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<char const*>(
        qpdf, oh, return_T<char const*>(""), [qpdf](QPDFObjectHandle& o) {
            QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_name");
            qpdf->tmp_string = o.getName();
            return qpdf->tmp_string.c_str();
        });
}

QPDF_BOOL
qpdf_oh_get_value_as_name(qpdf_data qpdf, qpdf_oh oh, char const** value, size_t* length)
{
    return do_with_oh<QPDF_BOOL>(
        qpdf, oh, return_false, [qpdf, value, length](QPDFObjectHandle& o) {
            QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_value_as_name");
            auto result = o.getValueAsName(qpdf->tmp_string);
            if (result) {
                *value = qpdf->tmp_string.c_str();
                *length = qpdf->tmp_string.length();
            }
            return result;
        });
}

char const*
qpdf_oh_get_string_value(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<char const*>(
        qpdf, oh, return_T<char const*>(""), [qpdf](QPDFObjectHandle& o) {
            QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_string_value");
            qpdf->tmp_string = o.getStringValue();
            return qpdf->tmp_string.c_str();
        });
}

QPDF_BOOL
qpdf_oh_get_value_as_string(qpdf_data qpdf, qpdf_oh oh, char const** value, size_t* length)
{
    return do_with_oh<QPDF_BOOL>(
        qpdf, oh, return_false, [qpdf, value, length](QPDFObjectHandle& o) {
            QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_value_as_string");
            auto result = o.getValueAsString(qpdf->tmp_string);
            if (result) {
                *value = qpdf->tmp_string.c_str();
                *length = qpdf->tmp_string.length();
            }
            return result;
        });
}

char const*
qpdf_oh_get_utf8_value(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<char const*>(
        qpdf, oh, return_T<char const*>(""), [qpdf](QPDFObjectHandle& o) {
            QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_utf8_value");
            qpdf->tmp_string = o.getUTF8Value();
            return qpdf->tmp_string.c_str();
        });
}

QPDF_BOOL
qpdf_oh_get_value_as_utf8(qpdf_data qpdf, qpdf_oh oh, char const** value, size_t* length)
{
    return do_with_oh<QPDF_BOOL>(
        qpdf, oh, return_false, [qpdf, value, length](QPDFObjectHandle& o) {
            QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_value_as_utf8");
            auto result = o.getValueAsUTF8(qpdf->tmp_string);
            if (result) {
                *value = qpdf->tmp_string.c_str();
                *length = qpdf->tmp_string.length();
            }
            return result;
        });
}

char const*
qpdf_oh_get_binary_string_value(qpdf_data qpdf, qpdf_oh oh, size_t* length)
{
    return do_with_oh<char const*>(
        qpdf, oh, return_T<char const*>(""), [qpdf, length](QPDFObjectHandle& o) {
            QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_binary_string_value");
            qpdf->tmp_string = o.getStringValue();
            *length = qpdf->tmp_string.length();
            return qpdf->tmp_string.c_str();
        });
}

char const*
qpdf_oh_get_binary_utf8_value(qpdf_data qpdf, qpdf_oh oh, size_t* length)
{
    return do_with_oh<char const*>(
        qpdf, oh, return_T<char const*>(""), [qpdf, length](QPDFObjectHandle& o) {
            QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_binary_utf8_value");
            qpdf->tmp_string = o.getUTF8Value();
            *length = qpdf->tmp_string.length();
            return qpdf->tmp_string.c_str();
        });
}

int
qpdf_oh_get_array_n_items(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<int>(qpdf, oh, return_T<int>(0), [](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_array_n_items");
        return o.getArrayNItems();
    });
}

qpdf_oh
qpdf_oh_get_array_item(qpdf_data qpdf, qpdf_oh oh, int n)
{
    return do_with_oh<qpdf_oh>(qpdf, oh, return_null(qpdf), [qpdf, n](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_array_item");
        return new_object(qpdf, o.getArrayItem(n));
    });
}

void
qpdf_oh_begin_dict_key_iter(qpdf_data qpdf, qpdf_oh oh)
{
    qpdf->cur_iter_dict_keys = do_with_oh<std::set<std::string>>(
        qpdf,
        oh,
        []() { return std::set<std::string>(); },
        [](QPDFObjectHandle& o) {
            QTC::TC("qpdf", "qpdf-c called qpdf_oh_begin_dict_key_iter");
            return o.getKeys();
        });
    qpdf->dict_iter = qpdf->cur_iter_dict_keys.begin();
}

QPDF_BOOL
qpdf_oh_dict_more_keys(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_dict_more_keys");
    return qpdf->dict_iter != qpdf->cur_iter_dict_keys.end();
}

char const*
qpdf_oh_dict_next_key(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_dict_next_key");
    if (qpdf_oh_dict_more_keys(qpdf)) {
        qpdf->cur_dict_key = *qpdf->dict_iter;
        ++qpdf->dict_iter;
        return qpdf->cur_dict_key.c_str();
    } else {
        return nullptr;
    }
}

QPDF_BOOL
qpdf_oh_has_key(qpdf_data qpdf, qpdf_oh oh, char const* key)
{
    return do_with_oh<QPDF_BOOL>(qpdf, oh, return_false, [key](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_has_key");
        return o.hasKey(key);
    });
}

qpdf_oh
qpdf_oh_get_key(qpdf_data qpdf, qpdf_oh oh, char const* key)
{
    return do_with_oh<qpdf_oh>(qpdf, oh, return_null(qpdf), [qpdf, key](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_key");
        return new_object(qpdf, o.getKey(key));
    });
}

qpdf_oh
qpdf_oh_get_key_if_dict(qpdf_data qpdf, qpdf_oh oh, char const* key)
{
    return do_with_oh<qpdf_oh>(qpdf, oh, return_null(qpdf), [qpdf, key](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_key_if_dict");
        return new_object(qpdf, o.getKeyIfDict(key));
    });
}

QPDF_BOOL
qpdf_oh_is_or_has_name(qpdf_data qpdf, qpdf_oh oh, char const* key)
{
    return do_with_oh<QPDF_BOOL>(qpdf, oh, return_false, [key](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_is_or_has_name");
        return o.isOrHasName(key);
    });
}

qpdf_oh
qpdf_oh_new_uninitialized(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_new_uninitialized");
    return new_object(qpdf, QPDFObjectHandle());
}

qpdf_oh
qpdf_oh_new_null(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_new_null");
    return new_object(qpdf, QPDFObjectHandle::newNull());
}

qpdf_oh
qpdf_oh_new_bool(qpdf_data qpdf, QPDF_BOOL value)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_new_bool");
    return new_object(qpdf, QPDFObjectHandle::newBool(value));
}

qpdf_oh
qpdf_oh_new_integer(qpdf_data qpdf, long long value)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_new_integer");
    return new_object(qpdf, QPDFObjectHandle::newInteger(value));
}

qpdf_oh
qpdf_oh_new_real_from_string(qpdf_data qpdf, char const* value)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_new_real_from_string");
    return new_object(qpdf, QPDFObjectHandle::newReal(value));
}

qpdf_oh
qpdf_oh_new_real_from_double(qpdf_data qpdf, double value, int decimal_places)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_new_real_from_double");
    return new_object(qpdf, QPDFObjectHandle::newReal(value, decimal_places));
}

qpdf_oh
qpdf_oh_new_name(qpdf_data qpdf, char const* name)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_new_name");
    return new_object(qpdf, QPDFObjectHandle::newName(name));
}

qpdf_oh
qpdf_oh_new_string(qpdf_data qpdf, char const* str)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_new_string");
    return new_object(qpdf, QPDFObjectHandle::newString(str));
}

qpdf_oh
qpdf_oh_new_unicode_string(qpdf_data qpdf, char const* utf8_str)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_new_unicode_string");
    return new_object(qpdf, QPDFObjectHandle::newUnicodeString(utf8_str));
}

qpdf_oh
qpdf_oh_new_binary_string(qpdf_data qpdf, char const* str, size_t length)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_new_binary_string");
    return new_object(qpdf, QPDFObjectHandle::newString(std::string(str, length)));
}

qpdf_oh
qpdf_oh_new_binary_unicode_string(qpdf_data qpdf, char const* utf8_str, size_t length)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_new_binary_unicode_string");
    return new_object(qpdf, QPDFObjectHandle::newUnicodeString(std::string(utf8_str, length)));
}

qpdf_oh
qpdf_oh_new_array(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_new_array");
    return new_object(qpdf, QPDFObjectHandle::newArray());
}

qpdf_oh
qpdf_oh_new_dictionary(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_new_dictionary");
    return new_object(qpdf, QPDFObjectHandle::newDictionary());
}

qpdf_oh
qpdf_oh_new_stream(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_new_stream");
    return new_object(qpdf, qpdf->qpdf->newStream());
}

void
qpdf_oh_make_direct(qpdf_data qpdf, qpdf_oh oh)
{
    do_with_oh_void(qpdf, oh, [](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_make_direct");
        o.makeDirect();
    });
}

qpdf_oh
qpdf_make_indirect_object(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<qpdf_oh>(qpdf, oh, return_uninitialized(qpdf), [qpdf](QPDFObjectHandle& o) {
        return new_object(qpdf, qpdf->qpdf->makeIndirectObject(o));
    });
}

static QPDFObjectHandle
qpdf_oh_item_internal(qpdf_data qpdf, qpdf_oh item)
{
    return do_with_oh<QPDFObjectHandle>(
        qpdf,
        item,
        []() { return QPDFObjectHandle::newNull(); },
        [](QPDFObjectHandle& o) { return o; });
}

void
qpdf_oh_set_array_item(qpdf_data qpdf, qpdf_oh oh, int at, qpdf_oh item)
{
    do_with_oh_void(qpdf, oh, [qpdf, at, item](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_set_array_item");
        o.setArrayItem(at, qpdf_oh_item_internal(qpdf, item));
    });
}

void
qpdf_oh_insert_item(qpdf_data qpdf, qpdf_oh oh, int at, qpdf_oh item)
{
    do_with_oh_void(qpdf, oh, [qpdf, at, item](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_insert_item");
        o.insertItem(at, qpdf_oh_item_internal(qpdf, item));
    });
}

void
qpdf_oh_append_item(qpdf_data qpdf, qpdf_oh oh, qpdf_oh item)
{
    do_with_oh_void(qpdf, oh, [qpdf, item](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_append_item");
        o.appendItem(qpdf_oh_item_internal(qpdf, item));
    });
}

void
qpdf_oh_erase_item(qpdf_data qpdf, qpdf_oh oh, int at)
{
    do_with_oh_void(qpdf, oh, [at](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_erase_item");
        o.eraseItem(at);
    });
}

void
qpdf_oh_replace_key(qpdf_data qpdf, qpdf_oh oh, char const* key, qpdf_oh item)
{
    do_with_oh_void(qpdf, oh, [qpdf, key, item](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_replace_key");
        o.replaceKey(key, qpdf_oh_item_internal(qpdf, item));
    });
}

void
qpdf_oh_remove_key(qpdf_data qpdf, qpdf_oh oh, char const* key)
{
    do_with_oh_void(qpdf, oh, [key](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_remove_key");
        o.removeKey(key);
    });
}

void
qpdf_oh_replace_or_remove_key(qpdf_data qpdf, qpdf_oh oh, char const* key, qpdf_oh item)
{
    do_with_oh_void(qpdf, oh, [qpdf, key, item](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_replace_or_remove_key");
        o.replaceKey(key, qpdf_oh_item_internal(qpdf, item));
    });
}

qpdf_oh
qpdf_oh_get_dict(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<qpdf_oh>(qpdf, oh, return_null(qpdf), [qpdf](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_dict");
        return new_object(qpdf, o.getDict());
    });
}

int
qpdf_oh_get_object_id(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<int>(qpdf, oh, return_T<int>(0), [](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_object_id");
        return o.getObjectID();
    });
}

int
qpdf_oh_get_generation(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<int>(qpdf, oh, return_T<int>(0), [](QPDFObjectHandle& o) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_generation");
        return o.getGeneration();
    });
}

char const*
qpdf_oh_unparse(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<char const*>(
        qpdf, oh, return_T<char const*>(""), [qpdf](QPDFObjectHandle& o) {
            QTC::TC("qpdf", "qpdf-c called qpdf_oh_unparse");
            qpdf->tmp_string = o.unparse();
            return qpdf->tmp_string.c_str();
        });
}

char const*
qpdf_oh_unparse_resolved(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<char const*>(
        qpdf, oh, return_T<char const*>(""), [qpdf](QPDFObjectHandle& o) {
            QTC::TC("qpdf", "qpdf-c called qpdf_oh_unparse_resolved");
            qpdf->tmp_string = o.unparseResolved();
            return qpdf->tmp_string.c_str();
        });
}

char const*
qpdf_oh_unparse_binary(qpdf_data qpdf, qpdf_oh oh)
{
    return do_with_oh<char const*>(
        qpdf, oh, return_T<char const*>(""), [qpdf](QPDFObjectHandle& o) {
            QTC::TC("qpdf", "qpdf-c called qpdf_oh_unparse_binary");
            qpdf->tmp_string = o.unparseBinary();
            return qpdf->tmp_string.c_str();
        });
}

qpdf_oh
qpdf_oh_copy_foreign_object(qpdf_data qpdf, qpdf_data other_qpdf, qpdf_oh foreign_oh)
{
    return do_with_oh<qpdf_oh>(
        other_qpdf, foreign_oh, return_uninitialized(qpdf), [qpdf](QPDFObjectHandle& o) {
            QTC::TC("qpdf", "qpdf-c called qpdf_oh_copy_foreign_object");
            return new_object(qpdf, qpdf->qpdf->copyForeignObject(o));
        });
}

QPDF_ERROR_CODE
qpdf_oh_get_stream_data(
    qpdf_data qpdf,
    qpdf_oh stream_oh,
    qpdf_stream_decode_level_e decode_level,
    QPDF_BOOL* filtered,
    unsigned char** bufp,
    size_t* len)
{
    return trap_errors(qpdf, [stream_oh, decode_level, filtered, bufp, len](qpdf_data q) {
        auto stream = qpdf_oh_item_internal(q, stream_oh);
        Pipeline* p = nullptr;
        Pl_Buffer buf("stream data");
        if (bufp) {
            p = &buf;
        }
        bool was_filtered = false;
        if (stream.pipeStreamData(p, &was_filtered, 0, decode_level, false, false)) {
            QTC::TC("qpdf", "qpdf-c stream data buf set", bufp ? 0 : 1);
            if (p && bufp && len) {
                buf.getMallocBuffer(bufp, len);
            }
            QTC::TC("qpdf", "qpdf-c stream data filtered set", filtered ? 0 : 1);
            if (filtered) {
                *filtered = was_filtered ? QPDF_TRUE : QPDF_FALSE;
            }
        } else {
            throw std::runtime_error("unable to access stream data for stream " + stream.unparse());
        }
    });
}

QPDF_ERROR_CODE
qpdf_oh_get_page_content_data(qpdf_data qpdf, qpdf_oh page_oh, unsigned char** bufp, size_t* len)
{
    return trap_errors(qpdf, [page_oh, bufp, len](qpdf_data q) {
        QTC::TC("qpdf", "qpdf-c called qpdf_oh_get_page_content_data");
        auto o = qpdf_oh_item_internal(q, page_oh);
        Pl_Buffer buf("page contents");
        o.pipePageContents(&buf);
        buf.getMallocBuffer(bufp, len);
    });
}

void
qpdf_oh_free_buffer(unsigned char** bufp)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_oh_free_buffer");
    if (bufp && *bufp) {
        free(*bufp);
        *bufp = nullptr;
    }
}

void
qpdf_oh_replace_stream_data(
    qpdf_data qpdf,
    qpdf_oh stream_oh,
    unsigned char const* buf,
    size_t len,
    qpdf_oh filter_oh,
    qpdf_oh decode_parms_oh)
{
    do_with_oh_void(
        qpdf, stream_oh, [qpdf, buf, len, filter_oh, decode_parms_oh](QPDFObjectHandle& o) {
            QTC::TC("qpdf", "qpdf-c called qpdf_oh_replace_stream_data");
            auto filter = qpdf_oh_item_internal(qpdf, filter_oh);
            auto decode_parms = qpdf_oh_item_internal(qpdf, decode_parms_oh);
            // XXX test with binary data with null
            o.replaceStreamData(
                std::string(reinterpret_cast<char const*>(buf), len), filter, decode_parms);
        });
}

int
qpdf_get_num_pages(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_num_pages");
    int n = -1;
    QPDF_ERROR_CODE code =
        trap_errors(qpdf, [&n](qpdf_data q) { n = QIntC::to_int(q->qpdf->getAllPages().size()); });
    if (code & QPDF_ERRORS) {
        return -1;
    }
    return n;
}

qpdf_oh
qpdf_get_page_n(qpdf_data qpdf, size_t i)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_get_page_n");
    qpdf_oh result = 0;
    QPDF_ERROR_CODE code = trap_errors(
        qpdf, [&result, i](qpdf_data q) { result = new_object(q, q->qpdf->getAllPages().at(i)); });
    if ((code & QPDF_ERRORS) || (result == 0)) {
        return qpdf_oh_new_uninitialized(qpdf);
    }
    return result;
}

QPDF_ERROR_CODE
qpdf_update_all_pages_cache(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_update_all_pages_cache");
    return trap_errors(qpdf, [](qpdf_data q) { q->qpdf->updateAllPagesCache(); });
}

int
qpdf_find_page_by_id(qpdf_data qpdf, int objid, int generation)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_find_page_by_id");
    int n = -1;
    QPDFObjGen og(objid, generation);
    QPDF_ERROR_CODE code =
        trap_errors(qpdf, [&n, &og](qpdf_data q) { n = QIntC::to_int(q->qpdf->findPage(og)); });
    if (code & QPDF_ERRORS) {
        return -1;
    }
    return n;
}

int
qpdf_find_page_by_oh(qpdf_data qpdf, qpdf_oh oh)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_find_page_by_oh");
    return do_with_oh<int>(qpdf, oh, return_T<int>(-1), [qpdf](QPDFObjectHandle& o) {
        return qpdf->qpdf->findPage(o);
    });
}

QPDF_ERROR_CODE
qpdf_push_inherited_attributes_to_page(qpdf_data qpdf)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_push_inherited_attributes_to_page");
    return trap_errors(qpdf, [](qpdf_data q) { q->qpdf->pushInheritedAttributesToPage(); });
}

QPDF_ERROR_CODE
qpdf_add_page(qpdf_data qpdf, qpdf_data newpage_qpdf, qpdf_oh newpage, QPDF_BOOL first)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_add_page");
    auto page = qpdf_oh_item_internal(newpage_qpdf, newpage);
    return trap_errors(qpdf, [&page, first](qpdf_data q) { q->qpdf->addPage(page, first); });
}

QPDF_ERROR_CODE
qpdf_add_page_at(
    qpdf_data qpdf, qpdf_data newpage_qpdf, qpdf_oh newpage, QPDF_BOOL before, qpdf_oh refpage)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_add_page_at");
    auto page = qpdf_oh_item_internal(newpage_qpdf, newpage);
    auto ref = qpdf_oh_item_internal(qpdf, refpage);
    return trap_errors(
        qpdf, [&page, before, &ref](qpdf_data q) { q->qpdf->addPageAt(page, before, ref); });
}

QPDF_ERROR_CODE
qpdf_remove_page(qpdf_data qpdf, qpdf_oh page)
{
    QTC::TC("qpdf", "qpdf-c called qpdf_remove_page");
    auto p = qpdf_oh_item_internal(qpdf, page);
    return trap_errors(qpdf, [&p](qpdf_data q) { q->qpdf->removePage(p); });
}

QPDF_ERROR_CODE
qpdf_create_from_json_file(qpdf_data qpdf, char const* filename)
{
    QPDF_ERROR_CODE status = QPDF_SUCCESS;
    qpdf->filename = filename;
    status = trap_errors(qpdf, [](qpdf_data q) { q->qpdf->createFromJSON(q->filename); });
    return status;
}

QPDF_ERROR_CODE
qpdf_create_from_json_data(qpdf_data qpdf, char const* buffer, unsigned long long size)
{
    QPDF_ERROR_CODE status = QPDF_SUCCESS;
    qpdf->filename = "json buffer";
    qpdf->buffer = buffer;
    qpdf->size = size;
    auto b = new Buffer(QUtil::unsigned_char_pointer(buffer), QIntC::to_size(size));
    auto is = std::make_shared<BufferInputSource>(qpdf->filename, b, true);
    status = trap_errors(qpdf, [&is](qpdf_data q) { q->qpdf->createFromJSON(is); });
    return status;
}

QPDF_ERROR_CODE
qpdf_update_from_json_file(qpdf_data qpdf, char const* filename)
{
    QPDF_ERROR_CODE status = QPDF_SUCCESS;
    status = trap_errors(qpdf, [filename](qpdf_data q) { q->qpdf->updateFromJSON(filename); });
    return status;
}

QPDF_ERROR_CODE
qpdf_update_from_json_data(qpdf_data qpdf, char const* buffer, unsigned long long size)
{
    QPDF_ERROR_CODE status = QPDF_SUCCESS;
    auto b = new Buffer(QUtil::unsigned_char_pointer(buffer), QIntC::to_size(size));
    auto is = std::make_shared<BufferInputSource>(qpdf->filename, b, true);
    status = trap_errors(qpdf, [&is](qpdf_data q) { q->qpdf->updateFromJSON(is); });
    return status;
}

QPDF_ERROR_CODE
qpdf_write_json(
    qpdf_data qpdf,
    int version,
    qpdf_write_fn_t fn,
    void* udata,
    enum qpdf_stream_decode_level_e decode_level,
    enum qpdf_json_stream_data_e json_stream_data,
    char const* file_prefix,
    char const* const* wanted_objects)
{
    QPDF_ERROR_CODE status = QPDF_SUCCESS;
    auto p = std::make_shared<Pl_Function>("write_json", nullptr, fn, udata);
    std::set<std::string> wanted_objects_set;
    if (wanted_objects) {
        for (auto i = wanted_objects; *i; ++i) {
            wanted_objects_set.insert(*i);
        }
    }
    status = trap_errors(
        qpdf,
        [version, p, decode_level, json_stream_data, file_prefix, &wanted_objects_set](
            qpdf_data q) {
            q->qpdf->writeJSON(
                version, p.get(), decode_level, json_stream_data, file_prefix, wanted_objects_set);
        });
    return status;
}

std::shared_ptr<QPDF>
qpdf_c_get_qpdf(qpdf_data qpdf)
{
    return qpdf->qpdf;
}

QPDF_ERROR_CODE
qpdf_c_wrap(qpdf_data qpdf, std::function<void()> fn)
{
    return trap_errors(qpdf, [&fn](qpdf_data) { fn(); });
}