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a3b4c9dfb9
qpdf/libqpdf/QPDFFormFieldObjectHelper.cc
Jay Berkenbilt b1dad0de2a Fix previous fix to setting checkbox value (fixes #1056) 
The code accepted values other than /Yes but still used /Yes as the
checked value instead of obeying the normal appearance dictionary.
2024-02-11 15:49:44 -05:00

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#include <qpdf/QPDFFormFieldObjectHelper.hh>
#include <qpdf/Pl_QPDFTokenizer.hh>
#include <qpdf/QIntC.hh>
#include <qpdf/QPDFAcroFormDocumentHelper.hh>
#include <qpdf/QPDFAnnotationObjectHelper.hh>
#include <qpdf/QTC.hh>
#include <qpdf/QUtil.hh>
#include <cstdlib>
QPDFFormFieldObjectHelper::QPDFFormFieldObjectHelper(QPDFObjectHandle oh) :
QPDFObjectHelper(oh),
m(new Members())
{
}
QPDFFormFieldObjectHelper::QPDFFormFieldObjectHelper() :
QPDFObjectHelper(QPDFObjectHandle::newNull()),
m(new Members())
{
}
bool
QPDFFormFieldObjectHelper::isNull()
{
return this->oh.isNull();
}
QPDFFormFieldObjectHelper
QPDFFormFieldObjectHelper::getParent()
{
return this->oh.getKey("/Parent"); // may be null
}
QPDFFormFieldObjectHelper
QPDFFormFieldObjectHelper::getTopLevelField(bool* is_different)
{
auto top_field = this->oh;
QPDFObjGen::set seen;
while (seen.add(top_field) && !top_field.getKeyIfDict("/Parent").isNull()) {
top_field = top_field.getKey("/Parent");
if (is_different) {
*is_different = true;
}
}
return {top_field};
}
QPDFObjectHandle
QPDFFormFieldObjectHelper::getFieldFromAcroForm(std::string const& name)
{
QPDFObjectHandle result = QPDFObjectHandle::newNull();
// Fields are supposed to be indirect, so this should work.
QPDF* q = this->oh.getOwningQPDF();
if (!q) {
return result;
}
auto acroform = q->getRoot().getKey("/AcroForm");
if (!acroform.isDictionary()) {
return result;
}
return acroform.getKey(name);
}
QPDFObjectHandle
QPDFFormFieldObjectHelper::getInheritableFieldValue(std::string const& name)
{
QPDFObjectHandle node = this->oh;
if (!node.isDictionary()) {
return QPDFObjectHandle::newNull();
}
QPDFObjectHandle result(node.getKey(name));
if (result.isNull()) {
QPDFObjGen::set seen;
while (seen.add(node) && node.hasKey("/Parent")) {
node = node.getKey("/Parent");
result = node.getKey(name);
if (!result.isNull()) {
QTC::TC("qpdf", "QPDFFormFieldObjectHelper non-trivial inheritance");
return result;
}
}
}
return result;
}
std::string
QPDFFormFieldObjectHelper::getInheritableFieldValueAsString(std::string const& name)
{
QPDFObjectHandle fv = getInheritableFieldValue(name);
std::string result;
if (fv.isString()) {
result = fv.getUTF8Value();
}
return result;
}
std::string
QPDFFormFieldObjectHelper::getInheritableFieldValueAsName(std::string const& name)
{
QPDFObjectHandle fv = getInheritableFieldValue(name);
std::string result;
if (fv.isName()) {
result = fv.getName();
}
return result;
}
std::string
QPDFFormFieldObjectHelper::getFieldType()
{
return getInheritableFieldValueAsName("/FT");
}
std::string
QPDFFormFieldObjectHelper::getFullyQualifiedName()
{
std::string result;
QPDFObjectHandle node = this->oh;
QPDFObjGen::set seen;
while (!node.isNull() && seen.add(node)) {
if (node.getKey("/T").isString()) {
if (!result.empty()) {
QTC::TC("qpdf", "QPDFFormFieldObjectHelper non-trivial qualified name");
result = "." + result;
}
result = node.getKey("/T").getUTF8Value() + result;
}
node = node.getKey("/Parent");
}
return result;
}
std::string
QPDFFormFieldObjectHelper::getPartialName()
{
std::string result;
if (this->oh.getKey("/T").isString()) {
result = this->oh.getKey("/T").getUTF8Value();
}
return result;
}
std::string
QPDFFormFieldObjectHelper::getAlternativeName()
{
if (this->oh.getKey("/TU").isString()) {
QTC::TC("qpdf", "QPDFFormFieldObjectHelper TU present");
return this->oh.getKey("/TU").getUTF8Value();
}
QTC::TC("qpdf", "QPDFFormFieldObjectHelper TU absent");
return getFullyQualifiedName();
}
std::string
QPDFFormFieldObjectHelper::getMappingName()
{
if (this->oh.getKey("/TM").isString()) {
QTC::TC("qpdf", "QPDFFormFieldObjectHelper TM present");
return this->oh.getKey("/TM").getUTF8Value();
}
QTC::TC("qpdf", "QPDFFormFieldObjectHelper TM absent");
return getAlternativeName();
}
QPDFObjectHandle
QPDFFormFieldObjectHelper::getValue()
{
return getInheritableFieldValue("/V");
}
std::string
QPDFFormFieldObjectHelper::getValueAsString()
{
return getInheritableFieldValueAsString("/V");
}
QPDFObjectHandle
QPDFFormFieldObjectHelper::getDefaultValue()
{
return getInheritableFieldValue("/DV");
}
std::string
QPDFFormFieldObjectHelper::getDefaultValueAsString()
{
return getInheritableFieldValueAsString("/DV");
}
QPDFObjectHandle
QPDFFormFieldObjectHelper::getDefaultResources()
{
return getFieldFromAcroForm("/DR");
}
std::string
QPDFFormFieldObjectHelper::getDefaultAppearance()
{
auto value = getInheritableFieldValue("/DA");
bool looked_in_acroform = false;
if (!value.isString()) {
value = getFieldFromAcroForm("/DA");
looked_in_acroform = true;
}
std::string result;
if (value.isString()) {
QTC::TC("qpdf", "QPDFFormFieldObjectHelper DA present", looked_in_acroform ? 0 : 1);
result = value.getUTF8Value();
}
return result;
}
int
QPDFFormFieldObjectHelper::getQuadding()
{
QPDFObjectHandle fv = getInheritableFieldValue("/Q");
bool looked_in_acroform = false;
if (!fv.isInteger()) {
fv = getFieldFromAcroForm("/Q");
looked_in_acroform = true;
}
int result = 0;
if (fv.isInteger()) {
QTC::TC("qpdf", "QPDFFormFieldObjectHelper Q present", looked_in_acroform ? 0 : 1);
result = QIntC::to_int(fv.getIntValue());
}
return result;
}
int
QPDFFormFieldObjectHelper::getFlags()
{
QPDFObjectHandle f = getInheritableFieldValue("/Ff");
return f.isInteger() ? f.getIntValueAsInt() : 0;
}
bool
QPDFFormFieldObjectHelper::isText()
{
return (getFieldType() == "/Tx");
}
bool
QPDFFormFieldObjectHelper::isCheckbox()
{
return ((getFieldType() == "/Btn") && ((getFlags() & (ff_btn_radio | ff_btn_pushbutton)) == 0));
}
bool
QPDFFormFieldObjectHelper::isRadioButton()
{
return ((getFieldType() == "/Btn") && ((getFlags() & ff_btn_radio) == ff_btn_radio));
}
bool
QPDFFormFieldObjectHelper::isPushbutton()
{
return ((getFieldType() == "/Btn") && ((getFlags() & ff_btn_pushbutton) == ff_btn_pushbutton));
}
bool
QPDFFormFieldObjectHelper::isChoice()
{
return (getFieldType() == "/Ch");
}
std::vector<std::string>
QPDFFormFieldObjectHelper::getChoices()
{
std::vector<std::string> result;
if (!isChoice()) {
return result;
}
QPDFObjectHandle opt = getInheritableFieldValue("/Opt");
if (opt.isArray()) {
int n = opt.getArrayNItems();
for (int i = 0; i < n; ++i) {
QPDFObjectHandle item = opt.getArrayItem(i);
if (item.isString()) {
result.push_back(item.getUTF8Value());
}
}
}
return result;
}
void
QPDFFormFieldObjectHelper::setFieldAttribute(std::string const& key, QPDFObjectHandle value)
{
this->oh.replaceKey(key, value);
}
void
QPDFFormFieldObjectHelper::setFieldAttribute(std::string const& key, std::string const& utf8_value)
{
this->oh.replaceKey(key, QPDFObjectHandle::newUnicodeString(utf8_value));
}
void
QPDFFormFieldObjectHelper::setV(QPDFObjectHandle value, bool need_appearances)
{
if (getFieldType() == "/Btn") {
if (isCheckbox()) {
bool okay = false;
if (value.isName()) {
std::string name = value.getName();
okay = true;
// Accept any value other than /Off to mean checked. Files have been seen that use
// /1 or other values.
setCheckBoxValue((name != "/Off"));
}
if (!okay) {
this->oh.warnIfPossible(
"ignoring attempt to set a checkbox field to a value whose type is not name");
}
} else if (isRadioButton()) {
if (value.isName()) {
setRadioButtonValue(value);
} else {
this->oh.warnIfPossible(
"ignoring attempt to set a radio button field to an object that is not a name");
}
} else if (isPushbutton()) {
this->oh.warnIfPossible("ignoring attempt set the value of a pushbutton field");
}
return;
}
if (value.isString()) {
setFieldAttribute("/V", QPDFObjectHandle::newUnicodeString(value.getUTF8Value()));
} else {
setFieldAttribute("/V", value);
}
if (need_appearances) {
QPDF& qpdf =
this->oh.getQPDF("QPDFFormFieldObjectHelper::setV called with need_appearances = "
"true on an object that is not associated with an owning QPDF");
QPDFAcroFormDocumentHelper(qpdf).setNeedAppearances(true);
}
}
void
QPDFFormFieldObjectHelper::setV(std::string const& utf8_value, bool need_appearances)
{
setV(QPDFObjectHandle::newUnicodeString(utf8_value), need_appearances);
}
void
QPDFFormFieldObjectHelper::setRadioButtonValue(QPDFObjectHandle name)
{
// Set the value of a radio button field. This has the following specific behavior:
// * If this is a radio button field that has a parent that is also a radio button field and has
// no explicit /V, call itself on the parent
// * If this is a radio button field with children, set /V to the given value. Then, for each
// child, if the child has the specified value as one of its keys in the /N subdictionary of
// its /AP (i.e. its normal appearance stream dictionary), set /AS to name; otherwise, if /Off
// is a member, set /AS to /Off.
// Note that we never turn on /NeedAppearances when setting a radio button field.
QPDFObjectHandle parent = this->oh.getKey("/Parent");
if (parent.isDictionary() && parent.getKey("/Parent").isNull()) {
QPDFFormFieldObjectHelper ph(parent);
if (ph.isRadioButton()) {
// This is most likely one of the individual buttons. Try calling on the parent.
QTC::TC("qpdf", "QPDFFormFieldObjectHelper set parent radio button");
ph.setRadioButtonValue(name);
return;
}
}
QPDFObjectHandle kids = this->oh.getKey("/Kids");
if (!(isRadioButton() && parent.isNull() && kids.isArray())) {
this->oh.warnIfPossible("don't know how to set the value"
" of this field as a radio button");
return;
}
setFieldAttribute("/V", name);
int nkids = kids.getArrayNItems();
for (int i = 0; i < nkids; ++i) {
QPDFObjectHandle kid = kids.getArrayItem(i);
QPDFObjectHandle AP = kid.getKey("/AP");
QPDFObjectHandle annot;
if (AP.isNull()) {
// The widget may be below. If there is more than one, just find the first one.
QPDFObjectHandle grandkids = kid.getKey("/Kids");
if (grandkids.isArray()) {
int ngrandkids = grandkids.getArrayNItems();
for (int j = 0; j < ngrandkids; ++j) {
QPDFObjectHandle grandkid = grandkids.getArrayItem(j);
AP = grandkid.getKey("/AP");
if (!AP.isNull()) {
QTC::TC("qpdf", "QPDFFormFieldObjectHelper radio button grandkid");
annot = grandkid;
break;
}
}
}
} else {
annot = kid;
}
if (!annot.isInitialized()) {
QTC::TC("qpdf", "QPDFObjectHandle broken radio button");
this->oh.warnIfPossible("unable to set the value of this radio button");
continue;
}
if (AP.isDictionary() && AP.getKey("/N").isDictionary() &&
AP.getKey("/N").hasKey(name.getName())) {
QTC::TC("qpdf", "QPDFFormFieldObjectHelper turn on radio button");
annot.replaceKey("/AS", name);
} else {
QTC::TC("qpdf", "QPDFFormFieldObjectHelper turn off radio button");
annot.replaceKey("/AS", QPDFObjectHandle::newName("/Off"));
}
}
}
void
QPDFFormFieldObjectHelper::setCheckBoxValue(bool value)
{
QPDFObjectHandle AP = this->oh.getKey("/AP");
QPDFObjectHandle annot;
if (AP.isNull()) {
// The widget may be below. If there is more than one, just
// find the first one.
QPDFObjectHandle kids = this->oh.getKey("/Kids");
if (kids.isArray()) {
int nkids = kids.getArrayNItems();
for (int i = 0; i < nkids; ++i) {
QPDFObjectHandle kid = kids.getArrayItem(i);
AP = kid.getKey("/AP");
if (!AP.isNull()) {
QTC::TC("qpdf", "QPDFFormFieldObjectHelper checkbox kid widget");
annot = kid;
break;
}
}
}
} else {
annot = this->oh;
}
std::string on_value;
if (value) {
// Set the "on" value to the first value in the appearance stream's normal state dictionary
// that isn't /Off. If not found, fall back to /Yes.
if (AP.isDictionary()) {
auto N = AP.getKey("/N");
if (N.isDictionary()) {
for (auto const& iter: N.ditems()) {
if (iter.first != "/Off") {
on_value = iter.first;
break;
}
}
}
}
if (on_value.empty()) {
on_value = "/Yes";
}
}
// Set /AS to the on value or /Off in addition to setting /V.
QPDFObjectHandle name = QPDFObjectHandle::newName(value ? on_value : "/Off");
setFieldAttribute("/V", name);
if (!annot.isInitialized()) {
QTC::TC("qpdf", "QPDFObjectHandle broken checkbox");
this->oh.warnIfPossible("unable to set the value of this checkbox");
return;
}
QTC::TC("qpdf", "QPDFFormFieldObjectHelper set checkbox AS");
annot.replaceKey("/AS", name);
}
void
QPDFFormFieldObjectHelper::generateAppearance(QPDFAnnotationObjectHelper& aoh)
{
std::string ft = getFieldType();
// Ignore field types we don't know how to generate appearances for. Button fields don't really
// need them -- see code in QPDFAcroFormDocumentHelper::generateAppearancesIfNeeded.
if ((ft == "/Tx") || (ft == "/Ch")) {
generateTextAppearance(aoh);
}
}
namespace
{
class ValueSetter: public QPDFObjectHandle::TokenFilter
{
public:
ValueSetter(
std::string const& DA,
std::string const& V,
std::vector<std::string> const& opt,
double tf,
QPDFObjectHandle::Rectangle const& bbox);
~ValueSetter() override = default;
void handleToken(QPDFTokenizer::Token const&) override;
void handleEOF() override;
void writeAppearance();
private:
std::string DA;
std::string V;
std::vector<std::string> opt;
double tf;
QPDFObjectHandle::Rectangle bbox;
enum { st_top, st_bmc, st_emc, st_end } state{st_top};
bool replaced{false};
};
} // namespace
ValueSetter::ValueSetter(
std::string const& DA,
std::string const& V,
std::vector<std::string> const& opt,
double tf,
QPDFObjectHandle::Rectangle const& bbox) :
DA(DA),
V(V),
opt(opt),
tf(tf),
bbox(bbox)
{
}
void
ValueSetter::handleToken(QPDFTokenizer::Token const& token)
{
QPDFTokenizer::token_type_e ttype = token.getType();
std::string value = token.getValue();
bool do_replace = false;
switch (state) {
case st_top:
writeToken(token);
if (token.isWord("BMC")) {
state = st_bmc;
}
break;
case st_bmc:
if ((ttype == QPDFTokenizer::tt_space) || (ttype == QPDFTokenizer::tt_comment)) {
writeToken(token);
} else {
state = st_emc;
}
// fall through to emc
case st_emc:
if (token.isWord("EMC")) {
do_replace = true;
state = st_end;
}
break;
case st_end:
writeToken(token);
break;
}
if (do_replace) {
writeAppearance();
}
}
void
ValueSetter::handleEOF()
{
if (!this->replaced) {
QTC::TC("qpdf", "QPDFFormFieldObjectHelper replaced BMC at EOF");
write("/Tx BMC\n");
writeAppearance();
}
}
void
ValueSetter::writeAppearance()
{
this->replaced = true;
// This code does not take quadding into consideration because doing so requires font metric
// information, which we don't have in many cases.
double tfh = 1.2 * tf;
int dx = 1;
// Write one or more lines, centered vertically, possibly with one row highlighted.
auto max_rows = static_cast<size_t>((bbox.ury - bbox.lly) / tfh);
bool highlight = false;
size_t highlight_idx = 0;
std::vector<std::string> lines;
if (opt.empty() || (max_rows < 2)) {
lines.push_back(V);
} else {
// Figure out what rows to write
size_t nopt = opt.size();
size_t found_idx = 0;
bool found = false;
for (found_idx = 0; found_idx < nopt; ++found_idx) {
if (opt.at(found_idx) == V) {
found = true;
break;
}
}
if (found) {
// Try to make the found item the second one, but adjust for under/overflow.
int wanted_first = QIntC::to_int(found_idx) - 1;
int wanted_last = QIntC::to_int(found_idx + max_rows) - 2;
QTC::TC("qpdf", "QPDFFormFieldObjectHelper list found");
while (wanted_first < 0) {
QTC::TC("qpdf", "QPDFFormFieldObjectHelper list first too low");
++wanted_first;
++wanted_last;
}
while (wanted_last >= QIntC::to_int(nopt)) {
QTC::TC("qpdf", "QPDFFormFieldObjectHelper list last too high");
if (wanted_first > 0) {
--wanted_first;
}
--wanted_last;
}
highlight = true;
highlight_idx = found_idx - QIntC::to_size(wanted_first);
for (size_t i = QIntC::to_size(wanted_first); i <= QIntC::to_size(wanted_last); ++i) {
lines.push_back(opt.at(i));
}
} else {
QTC::TC("qpdf", "QPDFFormFieldObjectHelper list not found");
// include our value and the first n-1 rows
highlight_idx = 0;
highlight = true;
lines.push_back(V);
for (size_t i = 0; ((i < nopt) && (i < (max_rows - 1))); ++i) {
lines.push_back(opt.at(i));
}
}
}
// Write the lines centered vertically, highlighting if needed
size_t nlines = lines.size();
double dy = bbox.ury - ((bbox.ury - bbox.lly - (static_cast<double>(nlines) * tfh)) / 2.0);
if (highlight) {
write(
"q\n0.85 0.85 0.85 rg\n" + QUtil::double_to_string(bbox.llx) + " " +
QUtil::double_to_string(
bbox.lly + dy - (tfh * (static_cast<double>(highlight_idx + 1)))) +
" " + QUtil::double_to_string(bbox.urx - bbox.llx) + " " +
QUtil::double_to_string(tfh) + " re f\nQ\n");
}
dy -= tf;
write("q\nBT\n" + DA + "\n");
for (size_t i = 0; i < nlines; ++i) {
// We could adjust Tm to translate to the beginning the first line, set TL to tfh, and use
// T* for each subsequent line, but doing this would require extracting any Tm from DA,
// which doesn't seem really worth the effort.
if (i == 0) {
write(
QUtil::double_to_string(bbox.llx + static_cast<double>(dx)) + " " +
QUtil::double_to_string(bbox.lly + static_cast<double>(dy)) + " Td\n");
} else {
write("0 " + QUtil::double_to_string(-tfh) + " Td\n");
}
write(QPDFObjectHandle::newString(lines.at(i)).unparse() + " Tj\n");
}
write("ET\nQ\nEMC");
}
namespace
{
class TfFinder: public QPDFObjectHandle::TokenFilter
{
public:
TfFinder() = default;
~TfFinder() override = default;
void handleToken(QPDFTokenizer::Token const&) override;
double getTf();
std::string getFontName();
std::string getDA();
private:
double tf{11.0};
int tf_idx{-1};
std::string font_name;
double last_num{0.0};
int last_num_idx{-1};
std::string last_name;
std::vector<std::string> DA;
};
} // namespace
void
TfFinder::handleToken(QPDFTokenizer::Token const& token)
{
QPDFTokenizer::token_type_e ttype = token.getType();
std::string value = token.getValue();
DA.push_back(token.getRawValue());
switch (ttype) {
case QPDFTokenizer::tt_integer:
case QPDFTokenizer::tt_real:
last_num = strtod(value.c_str(), nullptr);
last_num_idx = QIntC::to_int(DA.size() - 1);
break;
case QPDFTokenizer::tt_name:
last_name = value;
break;
case QPDFTokenizer::tt_word:
if (token.isWord("Tf")) {
if ((last_num > 1.0) && (last_num < 1000.0)) {
// These ranges are arbitrary but keep us from doing insane things or suffering from
// over/underflow
tf = last_num;
}
tf_idx = last_num_idx;
font_name = last_name;
}
break;
default:
break;
}
}
double
TfFinder::getTf()
{
return this->tf;
}
std::string
TfFinder::getDA()
{
std::string result;
size_t n = this->DA.size();
for (size_t i = 0; i < n; ++i) {
std::string cur = this->DA.at(i);
if (QIntC::to_int(i) == tf_idx) {
double delta = strtod(cur.c_str(), nullptr) - this->tf;
if ((delta > 0.001) || (delta < -0.001)) {
// tf doesn't match the font size passed to Tf, so substitute.
QTC::TC("qpdf", "QPDFFormFieldObjectHelper fallback Tf");
cur = QUtil::double_to_string(tf);
}
}
result += cur;
}
return result;
}
std::string
TfFinder::getFontName()
{
return this->font_name;
}
QPDFObjectHandle
QPDFFormFieldObjectHelper::getFontFromResource(QPDFObjectHandle resources, std::string const& name)
{
QPDFObjectHandle result;
if (resources.isDictionary() && resources.getKey("/Font").isDictionary() &&
resources.getKey("/Font").hasKey(name)) {
result = resources.getKey("/Font").getKey(name);
}
return result;
}
void
QPDFFormFieldObjectHelper::generateTextAppearance(QPDFAnnotationObjectHelper& aoh)
{
QPDFObjectHandle AS = aoh.getAppearanceStream("/N");
if (AS.isNull()) {
QTC::TC("qpdf", "QPDFFormFieldObjectHelper create AS from scratch");
QPDFObjectHandle::Rectangle rect = aoh.getRect();
QPDFObjectHandle::Rectangle bbox(0, 0, rect.urx - rect.llx, rect.ury - rect.lly);
QPDFObjectHandle dict =
QPDFObjectHandle::parse("<< /Resources << /ProcSet [ /PDF /Text ] >>"
" /Type /XObject /Subtype /Form >>");
dict.replaceKey("/BBox", QPDFObjectHandle::newFromRectangle(bbox));
AS = QPDFObjectHandle::newStream(this->oh.getOwningQPDF(), "/Tx BMC\nEMC\n");
AS.replaceDict(dict);
QPDFObjectHandle AP = aoh.getAppearanceDictionary();
if (AP.isNull()) {
QTC::TC("qpdf", "QPDFFormFieldObjectHelper create AP from scratch");
aoh.getObjectHandle().replaceKey("/AP", QPDFObjectHandle::newDictionary());
AP = aoh.getAppearanceDictionary();
}
AP.replaceKey("/N", AS);
}
if (!AS.isStream()) {
aoh.getObjectHandle().warnIfPossible("unable to get normal appearance stream for update");
return;
}
QPDFObjectHandle bbox_obj = AS.getDict().getKey("/BBox");
if (!bbox_obj.isRectangle()) {
aoh.getObjectHandle().warnIfPossible("unable to get appearance stream bounding box");
return;
}
QPDFObjectHandle::Rectangle bbox = bbox_obj.getArrayAsRectangle();
std::string DA = getDefaultAppearance();
std::string V = getValueAsString();
std::vector<std::string> opt;
if (isChoice() && ((getFlags() & ff_ch_combo) == 0)) {
opt = getChoices();
}
TfFinder tff;
Pl_QPDFTokenizer tok("tf", &tff);
tok.writeString(DA);
tok.finish();
double tf = tff.getTf();
DA = tff.getDA();
std::string (*encoder)(std::string const&, char) = &QUtil::utf8_to_ascii;
std::string font_name = tff.getFontName();
if (!font_name.empty()) {
// See if the font is encoded with something we know about.
QPDFObjectHandle resources = AS.getDict().getKey("/Resources");
QPDFObjectHandle font = getFontFromResource(resources, font_name);
bool found_font_in_dr = false;
if (!font.isInitialized()) {
QPDFObjectHandle dr = getDefaultResources();
font = getFontFromResource(dr, font_name);
found_font_in_dr = font.isDictionary();
}
if (found_font_in_dr && resources.isDictionary()) {
QTC::TC("qpdf", "QPDFFormFieldObjectHelper get font from /DR");
if (resources.isIndirect()) {
resources = resources.getQPDF().makeIndirectObject(resources.shallowCopy());
AS.getDict().replaceKey("/Resources", resources);
}
// Use mergeResources to force /Font to be local
resources.mergeResources("<< /Font << >> >>"_qpdf);
resources.getKey("/Font").replaceKey(font_name, font);
}
if (font.isDictionary() && font.getKey("/Encoding").isName()) {
std::string encoding = font.getKey("/Encoding").getName();
if (encoding == "/WinAnsiEncoding") {
QTC::TC("qpdf", "QPDFFormFieldObjectHelper WinAnsi");
encoder = &QUtil::utf8_to_win_ansi;
} else if (encoding == "/MacRomanEncoding") {
encoder = &QUtil::utf8_to_mac_roman;
}
}
}
V = (*encoder)(V, '?');
for (size_t i = 0; i < opt.size(); ++i) {
opt.at(i) = (*encoder)(opt.at(i), '?');
}
AS.addTokenFilter(
std::shared_ptr<QPDFObjectHandle::TokenFilter>(new ValueSetter(DA, V, opt, tf, bbox)));
}
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