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9c86ba40d8
qpdf/libqpdf/QPDFObjectHandle.cc
m-holger 9c86ba40d8 Fix commit 805c1ad : Reset QPDFValue::qpdf and QPDFValue::og when ... 
On destruction of the QPDF object replace all indirect object references
with direct nulls.

Remove all existing code to release resolved references.

Fixes performance issue due to interaction of resetting QPDFValue::qpdf and
og members and prior code.
2022-09-04 10:41:18 +01:00

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#include <qpdf/QPDFObjectHandle.hh>
#include <qpdf/BufferInputSource.hh>
#include <qpdf/Pl_Buffer.hh>
#include <qpdf/Pl_QPDFTokenizer.hh>
#include <qpdf/QPDF.hh>
#include <qpdf/QPDFExc.hh>
#include <qpdf/QPDFLogger.hh>
#include <qpdf/QPDFMatrix.hh>
#include <qpdf/QPDFObject.hh>
#include <qpdf/QPDFPageObjectHelper.hh>
#include <qpdf/QPDFParser.hh>
#include <qpdf/QPDF_Array.hh>
#include <qpdf/QPDF_Bool.hh>
#include <qpdf/QPDF_Dictionary.hh>
#include <qpdf/QPDF_InlineImage.hh>
#include <qpdf/QPDF_Integer.hh>
#include <qpdf/QPDF_Name.hh>
#include <qpdf/QPDF_Null.hh>
#include <qpdf/QPDF_Operator.hh>
#include <qpdf/QPDF_Real.hh>
#include <qpdf/QPDF_Reserved.hh>
#include <qpdf/QPDF_Stream.hh>
#include <qpdf/QPDF_String.hh>
#include <qpdf/QPDF_Unresolved.hh>
#include <qpdf/SparseOHArray.hh>
#include <qpdf/QIntC.hh>
#include <qpdf/QTC.hh>
#include <qpdf/QUtil.hh>
#include <algorithm>
#include <cstring>
#include <ctype.h>
#include <limits.h>
#include <stdexcept>
#include <stdlib.h>
namespace
{
class TerminateParsing
{
};
} // namespace
QPDFObjectHandle::StreamDataProvider::StreamDataProvider(bool supports_retry) :
supports_retry(supports_retry)
{
}
QPDFObjectHandle::StreamDataProvider::~StreamDataProvider()
{
// Must be explicit and not inline -- see QPDF_DLL_CLASS in
// README-maintainer
}
void
QPDFObjectHandle::StreamDataProvider::provideStreamData(
QPDFObjGen const& og, Pipeline* pipeline)
{
return provideStreamData(og.getObj(), og.getGen(), pipeline);
}
bool
QPDFObjectHandle::StreamDataProvider::provideStreamData(
QPDFObjGen const& og,
Pipeline* pipeline,
bool suppress_warnings,
bool will_retry)
{
return provideStreamData(
og.getObj(), og.getGen(), pipeline, suppress_warnings, will_retry);
}
void
QPDFObjectHandle::StreamDataProvider::provideStreamData(
int objid, int generation, Pipeline* pipeline)
{
throw std::logic_error(
"you must override provideStreamData -- see QPDFObjectHandle.hh");
}
bool
QPDFObjectHandle::StreamDataProvider::provideStreamData(
int objid,
int generation,
Pipeline* pipeline,
bool suppress_warnings,
bool will_retry)
{
throw std::logic_error(
"you must override provideStreamData -- see QPDFObjectHandle.hh");
return false;
}
bool
QPDFObjectHandle::StreamDataProvider::supportsRetry()
{
return this->supports_retry;
}
namespace
{
class CoalesceProvider: public QPDFObjectHandle::StreamDataProvider
{
public:
CoalesceProvider(
QPDFObjectHandle containing_page, QPDFObjectHandle old_contents) :
containing_page(containing_page),
old_contents(old_contents)
{
}
virtual ~CoalesceProvider() = default;
virtual void provideStreamData(QPDFObjGen const&, Pipeline* pipeline);
private:
QPDFObjectHandle containing_page;
QPDFObjectHandle old_contents;
};
} // namespace
void
CoalesceProvider::provideStreamData(QPDFObjGen const&, Pipeline* p)
{
QTC::TC("qpdf", "QPDFObjectHandle coalesce provide stream data");
std::string description =
"page object " + containing_page.getObjGen().unparse(' ');
std::string all_description;
old_contents.pipeContentStreams(p, description, all_description);
}
void
QPDFObjectHandle::TokenFilter::handleEOF()
{
}
void
QPDFObjectHandle::TokenFilter::setPipeline(Pipeline* p)
{
this->pipeline = p;
}
void
QPDFObjectHandle::TokenFilter::write(char const* data, size_t len)
{
if (!this->pipeline) {
return;
}
if (len) {
this->pipeline->write(data, len);
}
}
void
QPDFObjectHandle::TokenFilter::write(std::string const& str)
{
write(str.c_str(), str.length());
}
void
QPDFObjectHandle::TokenFilter::writeToken(QPDFTokenizer::Token const& token)
{
std::string value = token.getRawValue();
write(value.c_str(), value.length());
}
void
QPDFObjectHandle::ParserCallbacks::handleObject(QPDFObjectHandle)
{
throw std::logic_error("You must override one of the"
" handleObject methods in ParserCallbacks");
}
void
QPDFObjectHandle::ParserCallbacks::handleObject(
QPDFObjectHandle oh, size_t, size_t)
{
// This version of handleObject was added in qpdf 9. If the
// developer did not override it, fall back to the older
// interface.
handleObject(oh);
}
void
QPDFObjectHandle::ParserCallbacks::contentSize(size_t)
{
// Ignore by default; overriding this is optional.
}
void
QPDFObjectHandle::ParserCallbacks::terminateParsing()
{
throw TerminateParsing();
}
namespace
{
class LastChar: public Pipeline
{
public:
LastChar(Pipeline* next);
virtual ~LastChar() = default;
virtual void write(unsigned char const* data, size_t len);
virtual void finish();
unsigned char getLastChar();
private:
unsigned char last_char;
};
} // namespace
LastChar::LastChar(Pipeline* next) :
Pipeline("lastchar", next),
last_char(0)
{
}
void
LastChar::write(unsigned char const* data, size_t len)
{
if (len > 0) {
this->last_char = data[len - 1];
}
getNext()->write(data, len);
}
void
LastChar::finish()
{
getNext()->finish();
}
unsigned char
LastChar::getLastChar()
{
return this->last_char;
}
qpdf_object_type_e
QPDFObjectHandle::getTypeCode()
{
return dereference() ? this->obj->getTypeCode() : ::ot_uninitialized;
}
char const*
QPDFObjectHandle::getTypeName()
{
return dereference() ? this->obj->getTypeName() : "uninitialized";
}
QPDF_Array*
QPDFObjectHandle::asArray()
{
return dereference() ? obj->as<QPDF_Array>() : nullptr;
}
QPDF_Bool*
QPDFObjectHandle::asBool()
{
return dereference() ? obj->as<QPDF_Bool>() : nullptr;
}
QPDF_Dictionary*
QPDFObjectHandle::asDictionary()
{
return dereference() ? obj->as<QPDF_Dictionary>() : nullptr;
}
QPDF_InlineImage*
QPDFObjectHandle::asInlineImage()
{
return dereference() ? obj->as<QPDF_InlineImage>() : nullptr;
}
QPDF_Integer*
QPDFObjectHandle::asInteger()
{
return dereference() ? obj->as<QPDF_Integer>() : nullptr;
}
QPDF_Name*
QPDFObjectHandle::asName()
{
return dereference() ? obj->as<QPDF_Name>() : nullptr;
}
QPDF_Null*
QPDFObjectHandle::asNull()
{
return dereference() ? obj->as<QPDF_Null>() : nullptr;
}
QPDF_Operator*
QPDFObjectHandle::asOperator()
{
return dereference() ? obj->as<QPDF_Operator>() : nullptr;
}
QPDF_Real*
QPDFObjectHandle::asReal()
{
return dereference() ? obj->as<QPDF_Real>() : nullptr;
}
QPDF_Reserved*
QPDFObjectHandle::asReserved()
{
return dereference() ? obj->as<QPDF_Reserved>() : nullptr;
}
QPDF_Stream*
QPDFObjectHandle::asStream()
{
return dereference() ? obj->as<QPDF_Stream>() : nullptr;
}
QPDF_Stream*
QPDFObjectHandle::asStreamWithAssert()
{
auto stream = asStream();
assertType("stream", stream);
return stream;
}
QPDF_String*
QPDFObjectHandle::asString()
{
return dereference() ? obj->as<QPDF_String>() : nullptr;
}
bool
QPDFObjectHandle::isBool()
{
return dereference() && (obj->getTypeCode() == ::ot_boolean);
}
bool
QPDFObjectHandle::isDirectNull() const
{
// Don't call dereference() -- this is a const method, and we know
// objid == 0, so there's nothing to resolve.
return (
isInitialized() && (getObjectID() == 0) &&
(obj->getTypeCode() == ::ot_null));
}
bool
QPDFObjectHandle::isNull()
{
return dereference() && (obj->getTypeCode() == ::ot_null);
}
bool
QPDFObjectHandle::isInteger()
{
return dereference() && (obj->getTypeCode() == ::ot_integer);
}
bool
QPDFObjectHandle::isReal()
{
return dereference() && (obj->getTypeCode() == ::ot_real);
}
bool
QPDFObjectHandle::isNumber()
{
return (isInteger() || isReal());
}
double
QPDFObjectHandle::getNumericValue()
{
double result = 0.0;
if (isInteger()) {
result = static_cast<double>(getIntValue());
} else if (isReal()) {
result = atof(getRealValue().c_str());
} else {
typeWarning("number", "returning 0");
QTC::TC("qpdf", "QPDFObjectHandle numeric non-numeric");
}
return result;
}
bool
QPDFObjectHandle::getValueAsNumber(double& value)
{
if (!isNumber()) {
return false;
}
value = getNumericValue();
return true;
}
bool
QPDFObjectHandle::isName()
{
return dereference() && (obj->getTypeCode() == ::ot_name);
}
bool
QPDFObjectHandle::isString()
{
return dereference() && (obj->getTypeCode() == ::ot_string);
}
bool
QPDFObjectHandle::isOperator()
{
return dereference() && (obj->getTypeCode() == ::ot_operator);
}
bool
QPDFObjectHandle::isInlineImage()
{
return dereference() && (obj->getTypeCode() == ::ot_inlineimage);
}
bool
QPDFObjectHandle::isArray()
{
return dereference() && (obj->getTypeCode() == ::ot_array);
}
bool
QPDFObjectHandle::isDictionary()
{
return dereference() && (obj->getTypeCode() == ::ot_dictionary);
}
bool
QPDFObjectHandle::isStream()
{
return dereference() && (obj->getTypeCode() == ::ot_stream);
}
bool
QPDFObjectHandle::isReserved()
{
return dereference() && (obj->getTypeCode() == ::ot_reserved);
}
bool
QPDFObjectHandle::isScalar()
{
return (
!(isArray() || isDictionary() || isStream() || isOperator() ||
isInlineImage()));
}
bool
QPDFObjectHandle::isNameAndEquals(std::string const& name)
{
return isName() && (getName() == name);
}
bool
QPDFObjectHandle::isDictionaryOfType(
std::string const& type, std::string const& subtype)
{
return isDictionary() &&
(type.empty() || getKey("/Type").isNameAndEquals(type)) &&
(subtype.empty() || getKey("/Subtype").isNameAndEquals(subtype));
}
bool
QPDFObjectHandle::isStreamOfType(
std::string const& type, std::string const& subtype)
{
return isStream() && getDict().isDictionaryOfType(type, subtype);
}
// Bool accessors
bool
QPDFObjectHandle::getBoolValue()
{
auto boolean = asBool();
if (boolean) {
return boolean->getVal();
} else {
typeWarning("boolean", "returning false");
QTC::TC("qpdf", "QPDFObjectHandle boolean returning false");
return false;
}
}
bool
QPDFObjectHandle::getValueAsBool(bool& value)
{
auto boolean = asBool();
if (boolean == nullptr) {
return false;
}
value = boolean->getVal();
return true;
}
// Integer accessors
long long
QPDFObjectHandle::getIntValue()
{
auto integer = asInteger();
if (integer) {
return integer->getVal();
} else {
typeWarning("integer", "returning 0");
QTC::TC("qpdf", "QPDFObjectHandle integer returning 0");
return 0;
}
}
bool
QPDFObjectHandle::getValueAsInt(long long& value)
{
auto integer = asInteger();
if (integer == nullptr) {
return false;
}
value = integer->getVal();
return true;
}
int
QPDFObjectHandle::getIntValueAsInt()
{
int result = 0;
long long v = getIntValue();
if (v < INT_MIN) {
QTC::TC("qpdf", "QPDFObjectHandle int returning INT_MIN");
warnIfPossible(
"requested value of integer is too small; returning INT_MIN");
result = INT_MIN;
} else if (v > INT_MAX) {
QTC::TC("qpdf", "QPDFObjectHandle int returning INT_MAX");
warnIfPossible(
"requested value of integer is too big; returning INT_MAX");
result = INT_MAX;
} else {
result = static_cast<int>(v);
}
return result;
}
bool
QPDFObjectHandle::getValueAsInt(int& value)
{
if (!isInteger()) {
return false;
}
value = getIntValueAsInt();
return true;
}
unsigned long long
QPDFObjectHandle::getUIntValue()
{
unsigned long long result = 0;
long long v = getIntValue();
if (v < 0) {
QTC::TC("qpdf", "QPDFObjectHandle uint returning 0");
warnIfPossible(
"unsigned value request for negative number; returning 0");
} else {
result = static_cast<unsigned long long>(v);
}
return result;
}
bool
QPDFObjectHandle::getValueAsUInt(unsigned long long& value)
{
if (!isInteger()) {
return false;
}
value = getUIntValue();
return true;
}
unsigned int
QPDFObjectHandle::getUIntValueAsUInt()
{
unsigned int result = 0;
long long v = getIntValue();
if (v < 0) {
QTC::TC("qpdf", "QPDFObjectHandle uint uint returning 0");
warnIfPossible(
"unsigned integer value request for negative number; returning 0");
result = 0;
} else if (v > UINT_MAX) {
QTC::TC("qpdf", "QPDFObjectHandle uint returning UINT_MAX");
warnIfPossible("requested value of unsigned integer is too big;"
" returning UINT_MAX");
result = UINT_MAX;
} else {
result = static_cast<unsigned int>(v);
}
return result;
}
bool
QPDFObjectHandle::getValueAsUInt(unsigned int& value)
{
if (!isInteger()) {
return false;
}
value = getUIntValueAsUInt();
return true;
}
// Real accessors
std::string
QPDFObjectHandle::getRealValue()
{
auto real = asReal();
if (real) {
return real->getVal();
} else {
typeWarning("real", "returning 0.0");
QTC::TC("qpdf", "QPDFObjectHandle real returning 0.0");
return "0.0";
}
}
bool
QPDFObjectHandle::getValueAsReal(std::string& value)
{
auto real = asReal();
if (real == nullptr) {
return false;
}
value = real->getVal();
return true;
}
// Name accessors
std::string
QPDFObjectHandle::getName()
{
auto name = asName();
if (name) {
return name->getName();
} else {
typeWarning("name", "returning dummy name");
QTC::TC("qpdf", "QPDFObjectHandle name returning dummy name");
return "/QPDFFakeName";
}
}
bool
QPDFObjectHandle::getValueAsName(std::string& value)
{
auto name = asName();
if (name == nullptr) {
return false;
}
value = name->getName();
return true;
}
// String accessors
std::string
QPDFObjectHandle::getStringValue()
{
auto str = asString();
if (str) {
return str->getVal();
} else {
typeWarning("string", "returning empty string");
QTC::TC("qpdf", "QPDFObjectHandle string returning empty string");
return "";
}
}
bool
QPDFObjectHandle::getValueAsString(std::string& value)
{
auto str = asString();
if (str == nullptr) {
return false;
}
value = str->getVal();
return true;
}
std::string
QPDFObjectHandle::getUTF8Value()
{
auto str = asString();
if (str) {
return str->getUTF8Val();
} else {
typeWarning("string", "returning empty string");
QTC::TC("qpdf", "QPDFObjectHandle string returning empty utf8");
return "";
}
}
bool
QPDFObjectHandle::getValueAsUTF8(std::string& value)
{
auto str = asString();
if (str == nullptr) {
return false;
}
value = str->getUTF8Val();
return true;
}
// Operator and Inline Image accessors
std::string
QPDFObjectHandle::getOperatorValue()
{
auto op = asOperator();
if (op) {
return op->getVal();
} else {
typeWarning("operator", "returning fake value");
QTC::TC("qpdf", "QPDFObjectHandle operator returning fake value");
return "QPDFFAKE";
}
}
bool
QPDFObjectHandle::getValueAsOperator(std::string& value)
{
auto op = asOperator();
if (op == nullptr) {
return false;
}
value = op->getVal();
return true;
}
std::string
QPDFObjectHandle::getInlineImageValue()
{
auto image = asInlineImage();
if (image) {
return image->getVal();
} else {
typeWarning("inlineimage", "returning empty data");
QTC::TC("qpdf", "QPDFObjectHandle inlineimage returning empty data");
return "";
}
}
bool
QPDFObjectHandle::getValueAsInlineImage(std::string& value)
{
auto image = asInlineImage();
if (image == nullptr) {
return false;
}
value = image->getVal();
return true;
}
// Array accessors
QPDFObjectHandle::QPDFArrayItems
QPDFObjectHandle::aitems()
{
return QPDFArrayItems(*this);
}
int
QPDFObjectHandle::getArrayNItems()
{
auto array = asArray();
if (array) {
return array->getNItems();
} else {
typeWarning("array", "treating as empty");
QTC::TC("qpdf", "QPDFObjectHandle array treating as empty");
return 0;
}
}
QPDFObjectHandle
QPDFObjectHandle::getArrayItem(int n)
{
QPDFObjectHandle result;
auto array = asArray();
if (array && (n < array->getNItems()) && (n >= 0)) {
result = array->getItem(n);
} else {
result = newNull();
if (array) {
objectWarning("returning null for out of bounds array access");
QTC::TC("qpdf", "QPDFObjectHandle array bounds");
} else {
typeWarning("array", "returning null");
QTC::TC("qpdf", "QPDFObjectHandle array null for non-array");
}
QPDF* context = nullptr;
std::string description;
if (obj->getDescription(context, description)) {
result.setObjectDescription(
context,
description + " -> null returned from invalid array access");
}
}
return result;
}
bool
QPDFObjectHandle::isRectangle()
{
auto array = asArray();
if ((array == nullptr) || (array->getNItems() != 4)) {
return false;
}
for (int i = 0; i < 4; ++i) {
if (!array->getItem(i).isNumber()) {
return false;
}
}
return true;
}
bool
QPDFObjectHandle::isMatrix()
{
auto array = asArray();
if ((array == nullptr) || (array->getNItems() != 6)) {
return false;
}
for (int i = 0; i < 6; ++i) {
if (!array->getItem(i).isNumber()) {
return false;
}
}
return true;
}
QPDFObjectHandle::Rectangle
QPDFObjectHandle::getArrayAsRectangle()
{
Rectangle result;
if (isRectangle()) {
auto array = asArray();
// Rectangle coordinates are always supposed to be llx, lly,
// urx, ury, but files have been found in the wild where
// llx > urx or lly > ury.
double i0 = array->getItem(0).getNumericValue();
double i1 = array->getItem(1).getNumericValue();
double i2 = array->getItem(2).getNumericValue();
double i3 = array->getItem(3).getNumericValue();
result = Rectangle(
std::min(i0, i2),
std::min(i1, i3),
std::max(i0, i2),
std::max(i1, i3));
}
return result;
}
QPDFObjectHandle::Matrix
QPDFObjectHandle::getArrayAsMatrix()
{
Matrix result;
if (isMatrix()) {
auto array = asArray();
result = Matrix(
array->getItem(0).getNumericValue(),
array->getItem(1).getNumericValue(),
array->getItem(2).getNumericValue(),
array->getItem(3).getNumericValue(),
array->getItem(4).getNumericValue(),
array->getItem(5).getNumericValue());
}
return result;
}
std::vector<QPDFObjectHandle>
QPDFObjectHandle::getArrayAsVector()
{
std::vector<QPDFObjectHandle> result;
auto array = asArray();
if (array) {
array->getAsVector(result);
} else {
typeWarning("array", "treating as empty");
QTC::TC("qpdf", "QPDFObjectHandle array treating as empty vector");
}
return result;
}
// Array mutators
void
QPDFObjectHandle::setArrayItem(int n, QPDFObjectHandle const& item)
{
auto array = asArray();
if (array) {
checkOwnership(item);
array->setItem(n, item);
} else {
typeWarning("array", "ignoring attempt to set item");
QTC::TC("qpdf", "QPDFObjectHandle array ignoring set item");
}
}
void
QPDFObjectHandle::setArrayFromVector(std::vector<QPDFObjectHandle> const& items)
{
auto array = asArray();
if (array) {
for (auto const& item: items) {
checkOwnership(item);
}
array->setFromVector(items);
} else {
typeWarning("array", "ignoring attempt to replace items");
QTC::TC("qpdf", "QPDFObjectHandle array ignoring replace items");
}
}
void
QPDFObjectHandle::insertItem(int at, QPDFObjectHandle const& item)
{
auto array = asArray();
if (array) {
array->insertItem(at, item);
} else {
typeWarning("array", "ignoring attempt to insert item");
QTC::TC("qpdf", "QPDFObjectHandle array ignoring insert item");
}
}
QPDFObjectHandle
QPDFObjectHandle::insertItemAndGetNew(int at, QPDFObjectHandle const& item)
{
insertItem(at, item);
return item;
}
void
QPDFObjectHandle::appendItem(QPDFObjectHandle const& item)
{
auto array = asArray();
if (array) {
checkOwnership(item);
array->appendItem(item);
} else {
typeWarning("array", "ignoring attempt to append item");
QTC::TC("qpdf", "QPDFObjectHandle array ignoring append item");
}
}
QPDFObjectHandle
QPDFObjectHandle::appendItemAndGetNew(QPDFObjectHandle const& item)
{
appendItem(item);
return item;
}
void
QPDFObjectHandle::eraseItem(int at)
{
auto array = asArray();
if (array && (at < array->getNItems()) && (at >= 0)) {
array->eraseItem(at);
} else {
if (array) {
objectWarning("ignoring attempt to erase out of bounds array item");
QTC::TC("qpdf", "QPDFObjectHandle erase array bounds");
} else {
typeWarning("array", "ignoring attempt to erase item");
QTC::TC("qpdf", "QPDFObjectHandle array ignoring erase item");
}
}
}
QPDFObjectHandle
QPDFObjectHandle::eraseItemAndGetOld(int at)
{
auto result = QPDFObjectHandle::newNull();
auto array = asArray();
if (array && (at < array->getNItems()) && (at >= 0)) {
result = array->getItem(at);
}
eraseItem(at);
return result;
}
// Dictionary accessors
QPDFObjectHandle::QPDFDictItems
QPDFObjectHandle::ditems()
{
return QPDFDictItems(*this);
}
bool
QPDFObjectHandle::hasKey(std::string const& key)
{
auto dict = asDictionary();
if (dict) {
return dict->hasKey(key);
} else {
typeWarning(
"dictionary", "returning false for a key containment request");
QTC::TC("qpdf", "QPDFObjectHandle dictionary false for hasKey");
return false;
}
}
QPDFObjectHandle
QPDFObjectHandle::getKey(std::string const& key)
{
QPDFObjectHandle result;
auto dict = asDictionary();
if (dict) {
result = dict->getKey(key);
} else {
typeWarning("dictionary", "returning null for attempted key retrieval");
QTC::TC("qpdf", "QPDFObjectHandle dictionary null for getKey");
result = newNull();
QPDF* qpdf = nullptr;
std::string description;
if (obj->getDescription(qpdf, description)) {
result.setObjectDescription(
qpdf,
(description + " -> null returned from getting key " + key +
" from non-Dictionary"));
}
}
return result;
}
QPDFObjectHandle
QPDFObjectHandle::getKeyIfDict(std::string const& key)
{
return isNull() ? newNull() : getKey(key);
}
std::set<std::string>
QPDFObjectHandle::getKeys()
{
std::set<std::string> result;
auto dict = asDictionary();
if (dict) {
result = dict->getKeys();
} else {
typeWarning("dictionary", "treating as empty");
QTC::TC("qpdf", "QPDFObjectHandle dictionary empty set for getKeys");
}
return result;
}
std::map<std::string, QPDFObjectHandle>
QPDFObjectHandle::getDictAsMap()
{
std::map<std::string, QPDFObjectHandle> result;
auto dict = asDictionary();
if (dict) {
result = dict->getAsMap();
} else {
typeWarning("dictionary", "treating as empty");
QTC::TC("qpdf", "QPDFObjectHandle dictionary empty map for asMap");
}
return result;
}
// Array and Name accessors
bool
QPDFObjectHandle::isOrHasName(std::string const& value)
{
if (isNameAndEquals(value)) {
return true;
} else if (isArray()) {
for (auto& item: aitems()) {
if (item.isNameAndEquals(value)) {
return true;
}
}
}
return false;
}
void
QPDFObjectHandle::makeResourcesIndirect(QPDF& owning_qpdf)
{
if (!isDictionary()) {
return;
}
for (auto const& i1: ditems()) {
QPDFObjectHandle sub = i1.second;
if (!sub.isDictionary()) {
continue;
}
for (auto i2: sub.ditems()) {
std::string const& key = i2.first;
QPDFObjectHandle val = i2.second;
if (!val.isIndirect()) {
sub.replaceKey(key, owning_qpdf.makeIndirectObject(val));
}
}
}
}
void
QPDFObjectHandle::mergeResources(
QPDFObjectHandle other,
std::map<std::string, std::map<std::string, std::string>>* conflicts)
{
if (!(isDictionary() && other.isDictionary())) {
QTC::TC("qpdf", "QPDFObjectHandle merge top type mismatch");
return;
}
auto make_og_to_name = [](QPDFObjectHandle& dict,
std::map<QPDFObjGen, std::string>& og_to_name) {
for (auto i: dict.ditems()) {
if (i.second.isIndirect()) {
og_to_name[i.second.getObjGen()] = i.first;
}
}
};
// This algorithm is described in comments in QPDFObjectHandle.hh
// above the declaration of mergeResources.
for (auto o_top: other.ditems()) {
std::string const& rtype = o_top.first;
QPDFObjectHandle other_val = o_top.second;
if (hasKey(rtype)) {
QPDFObjectHandle this_val = getKey(rtype);
if (this_val.isDictionary() && other_val.isDictionary()) {
if (this_val.isIndirect()) {
// Do this even if there are no keys. Various
// places in the code call mergeResources with
// resource dictionaries that contain empty
// subdictionaries just to get this shallow copy
// functionality.
QTC::TC("qpdf", "QPDFObjectHandle replace with copy");
this_val =
replaceKeyAndGetNew(rtype, this_val.shallowCopy());
}
std::map<QPDFObjGen, std::string> og_to_name;
std::set<std::string> rnames;
int min_suffix = 1;
bool initialized_maps = false;
for (auto ov_iter: other_val.ditems()) {
std::string const& key = ov_iter.first;
QPDFObjectHandle rval = ov_iter.second;
if (!this_val.hasKey(key)) {
if (!rval.isIndirect()) {
QTC::TC(
"qpdf", "QPDFObjectHandle merge shallow copy");
rval = rval.shallowCopy();
}
this_val.replaceKey(key, rval);
} else if (conflicts) {
if (!initialized_maps) {
make_og_to_name(this_val, og_to_name);
rnames = this_val.getResourceNames();
initialized_maps = true;
}
auto rval_og = rval.getObjGen();
if (rval.isIndirect() && og_to_name.count(rval_og)) {
QTC::TC("qpdf", "QPDFObjectHandle merge reuse");
auto new_key = og_to_name[rval_og];
if (new_key != key) {
(*conflicts)[rtype][key] = new_key;
}
} else {
QTC::TC("qpdf", "QPDFObjectHandle merge generate");
std::string new_key = getUniqueResourceName(
key + "_", min_suffix, &rnames);
(*conflicts)[rtype][key] = new_key;
this_val.replaceKey(new_key, rval);
}
}
}
} else if (this_val.isArray() && other_val.isArray()) {
std::set<std::string> scalars;
for (auto this_item: this_val.aitems()) {
if (this_item.isScalar()) {
scalars.insert(this_item.unparse());
}
}
for (auto other_item: other_val.aitems()) {
if (other_item.isScalar()) {
if (scalars.count(other_item.unparse()) == 0) {
QTC::TC("qpdf", "QPDFObjectHandle merge array");
this_val.appendItem(other_item);
} else {
QTC::TC("qpdf", "QPDFObjectHandle merge array dup");
}
}
}
}
} else {
QTC::TC("qpdf", "QPDFObjectHandle merge copy from other");
replaceKey(rtype, other_val.shallowCopy());
}
}
}
std::set<std::string>
QPDFObjectHandle::getResourceNames()
{
// Return second-level dictionary keys
std::set<std::string> result;
if (!isDictionary()) {
return result;
}
for (auto const& key: getKeys()) {
QPDFObjectHandle val = getKey(key);
if (val.isDictionary()) {
for (auto const& val_key: val.getKeys()) {
result.insert(val_key);
}
}
}
return result;
}
std::string
QPDFObjectHandle::getUniqueResourceName(
std::string const& prefix, int& min_suffix, std::set<std::string>* namesp)
{
std::set<std::string> names = (namesp ? *namesp : getResourceNames());
int max_suffix = min_suffix + QIntC::to_int(names.size());
while (min_suffix <= max_suffix) {
std::string candidate = prefix + QUtil::int_to_string(min_suffix);
if (names.count(candidate) == 0) {
return candidate;
}
// Increment after return; min_suffix should be the value
// used, not the next value.
++min_suffix;
}
// This could only happen if there is a coding error.
// The number of candidates we test is more than the
// number of keys we're checking against.
throw std::logic_error("unable to find unconflicting name in"
" QPDFObjectHandle::getUniqueResourceName");
}
// Dictionary mutators
void
QPDFObjectHandle::replaceKey(
std::string const& key, QPDFObjectHandle const& value)
{
auto dict = asDictionary();
if (dict) {
checkOwnership(value);
dict->replaceKey(key, value);
} else {
typeWarning("dictionary", "ignoring key replacement request");
QTC::TC("qpdf", "QPDFObjectHandle dictionary ignoring replaceKey");
}
}
QPDFObjectHandle
QPDFObjectHandle::replaceKeyAndGetNew(
std::string const& key, QPDFObjectHandle const& value)
{
replaceKey(key, value);
return value;
}
QPDFObjectHandle
QPDFObjectHandle::replaceKeyAndGetOld(
std::string const& key, QPDFObjectHandle const& value)
{
QPDFObjectHandle old = removeKeyAndGetOld(key);
replaceKey(key, value);
return old;
}
void
QPDFObjectHandle::removeKey(std::string const& key)
{
auto dict = asDictionary();
if (dict) {
dict->removeKey(key);
} else {
typeWarning("dictionary", "ignoring key removal request");
QTC::TC("qpdf", "QPDFObjectHandle dictionary ignoring removeKey");
}
}
QPDFObjectHandle
QPDFObjectHandle::removeKeyAndGetOld(std::string const& key)
{
auto result = QPDFObjectHandle::newNull();
auto dict = asDictionary();
if (dict) {
result = dict->getKey(key);
}
removeKey(key);
return result;
}
void
QPDFObjectHandle::replaceOrRemoveKey(
std::string const& key, QPDFObjectHandle const& value)
{
replaceKey(key, value);
}
// Stream accessors
QPDFObjectHandle
QPDFObjectHandle::getDict()
{
return asStreamWithAssert()->getDict();
}
void
QPDFObjectHandle::setFilterOnWrite(bool val)
{
asStreamWithAssert()->setFilterOnWrite(val);
}
bool
QPDFObjectHandle::getFilterOnWrite()
{
return asStreamWithAssert()->getFilterOnWrite();
}
bool
QPDFObjectHandle::isDataModified()
{
return asStreamWithAssert()->isDataModified();
}
void
QPDFObjectHandle::replaceDict(QPDFObjectHandle const& new_dict)
{
asStreamWithAssert()->replaceDict(new_dict);
}
std::shared_ptr<Buffer>
QPDFObjectHandle::getStreamData(qpdf_stream_decode_level_e level)
{
return asStreamWithAssert()->getStreamData(level);
}
std::shared_ptr<Buffer>
QPDFObjectHandle::getRawStreamData()
{
return asStreamWithAssert()->getRawStreamData();
}
bool
QPDFObjectHandle::pipeStreamData(
Pipeline* p,
bool* filtering_attempted,
int encode_flags,
qpdf_stream_decode_level_e decode_level,
bool suppress_warnings,
bool will_retry)
{
return asStreamWithAssert()->pipeStreamData(
p,
filtering_attempted,
encode_flags,
decode_level,
suppress_warnings,
will_retry);
}
bool
QPDFObjectHandle::pipeStreamData(
Pipeline* p,
int encode_flags,
qpdf_stream_decode_level_e decode_level,
bool suppress_warnings,
bool will_retry)
{
bool filtering_attempted;
asStreamWithAssert()->pipeStreamData(
p,
&filtering_attempted,
encode_flags,
decode_level,
suppress_warnings,
will_retry);
return filtering_attempted;
}
bool
QPDFObjectHandle::pipeStreamData(
Pipeline* p, bool filter, bool normalize, bool compress)
{
int encode_flags = 0;
qpdf_stream_decode_level_e decode_level = qpdf_dl_none;
if (filter) {
decode_level = qpdf_dl_generalized;
if (normalize) {
encode_flags |= qpdf_ef_normalize;
}
if (compress) {
encode_flags |= qpdf_ef_compress;
}
}
return pipeStreamData(p, encode_flags, decode_level, false);
}
void
QPDFObjectHandle::replaceStreamData(
std::shared_ptr<Buffer> data,
QPDFObjectHandle const& filter,
QPDFObjectHandle const& decode_parms)
{
asStreamWithAssert()->replaceStreamData(data, filter, decode_parms);
}
void
QPDFObjectHandle::replaceStreamData(
std::string const& data,
QPDFObjectHandle const& filter,
QPDFObjectHandle const& decode_parms)
{
auto b = std::make_shared<Buffer>(data.length());
unsigned char* bp = b->getBuffer();
if (bp) {
memcpy(bp, data.c_str(), data.length());
}
asStreamWithAssert()->replaceStreamData(b, filter, decode_parms);
}
void
QPDFObjectHandle::replaceStreamData(
std::shared_ptr<StreamDataProvider> provider,
QPDFObjectHandle const& filter,
QPDFObjectHandle const& decode_parms)
{
asStreamWithAssert()->replaceStreamData(provider, filter, decode_parms);
}
namespace
{
class FunctionProvider: public QPDFObjectHandle::StreamDataProvider
{
public:
FunctionProvider(std::function<void(Pipeline*)> provider) :
StreamDataProvider(false),
p1(provider),
p2(nullptr)
{
}
FunctionProvider(std::function<bool(Pipeline*, bool, bool)> provider) :
StreamDataProvider(true),
p1(nullptr),
p2(provider)
{
}
virtual void
provideStreamData(QPDFObjGen const&, Pipeline* pipeline) override
{
p1(pipeline);
}
virtual bool
provideStreamData(
QPDFObjGen const&,
Pipeline* pipeline,
bool suppress_warnings,
bool will_retry) override
{
return p2(pipeline, suppress_warnings, will_retry);
}
private:
std::function<void(Pipeline*)> p1;
std::function<bool(Pipeline*, bool, bool)> p2;
};
} // namespace
void
QPDFObjectHandle::replaceStreamData(
std::function<void(Pipeline*)> provider,
QPDFObjectHandle const& filter,
QPDFObjectHandle const& decode_parms)
{
auto sdp =
std::shared_ptr<StreamDataProvider>(new FunctionProvider(provider));
asStreamWithAssert()->replaceStreamData(sdp, filter, decode_parms);
}
void
QPDFObjectHandle::replaceStreamData(
std::function<bool(Pipeline*, bool, bool)> provider,
QPDFObjectHandle const& filter,
QPDFObjectHandle const& decode_parms)
{
auto sdp =
std::shared_ptr<StreamDataProvider>(new FunctionProvider(provider));
asStreamWithAssert()->replaceStreamData(sdp, filter, decode_parms);
}
std::map<std::string, QPDFObjectHandle>
QPDFObjectHandle::getPageImages()
{
return QPDFPageObjectHelper(*this).getImages();
}
std::vector<QPDFObjectHandle>
QPDFObjectHandle::arrayOrStreamToStreamArray(
std::string const& description, std::string& all_description)
{
all_description = description;
std::vector<QPDFObjectHandle> result;
auto array = asArray();
if (array) {
int n_items = array->getNItems();
for (int i = 0; i < n_items; ++i) {
QPDFObjectHandle item = array->getItem(i);
if (item.isStream()) {
result.push_back(item);
} else {
QTC::TC("qpdf", "QPDFObjectHandle non-stream in stream array");
warn(
item.getOwningQPDF(),
QPDFExc(
qpdf_e_damaged_pdf,
"",
description + ": item index " +
QUtil::int_to_string(i) + " (from 0)",
0,
"ignoring non-stream in an array of streams"));
}
}
} else if (isStream()) {
result.push_back(*this);
} else if (!isNull()) {
warn(
getOwningQPDF(),
QPDFExc(
qpdf_e_damaged_pdf,
"",
description,
0,
" object is supposed to be a stream or an"
" array of streams but is neither"));
}
bool first = true;
for (auto const& item: result) {
if (first) {
first = false;
} else {
all_description += ",";
}
all_description += " stream " + item.getObjGen().unparse(' ');
}
return result;
}
std::vector<QPDFObjectHandle>
QPDFObjectHandle::getPageContents()
{
std::string description = "page object " + getObjGen().unparse(' ');
std::string all_description;
return this->getKey("/Contents")
.arrayOrStreamToStreamArray(description, all_description);
}
void
QPDFObjectHandle::addPageContents(QPDFObjectHandle new_contents, bool first)
{
new_contents.assertStream();
std::vector<QPDFObjectHandle> content_streams;
if (first) {
QTC::TC("qpdf", "QPDFObjectHandle prepend page contents");
content_streams.push_back(new_contents);
}
for (auto const& iter: getPageContents()) {
QTC::TC("qpdf", "QPDFObjectHandle append page contents");
content_streams.push_back(iter);
}
if (!first) {
content_streams.push_back(new_contents);
}
this->replaceKey("/Contents", newArray(content_streams));
}
void
QPDFObjectHandle::rotatePage(int angle, bool relative)
{
if ((angle % 90) != 0) {
throw std::runtime_error("QPDF::rotatePage called with an"
" angle that is not a multiple of 90");
}
int new_angle = angle;
if (relative) {
int old_angle = 0;
bool found_rotate = false;
QPDFObjectHandle cur_obj = *this;
bool searched_parent = false;
std::set<QPDFObjGen> visited;
while (!found_rotate) {
if (visited.count(cur_obj.getObjGen())) {
// Don't get stuck in an infinite loop
break;
}
if (!visited.empty()) {
searched_parent = true;
}
visited.insert(cur_obj.getObjGen());
if (cur_obj.getKey("/Rotate").isInteger()) {
found_rotate = true;
old_angle = cur_obj.getKey("/Rotate").getIntValueAsInt();
} else if (cur_obj.getKey("/Parent").isDictionary()) {
cur_obj = cur_obj.getKey("/Parent");
} else {
break;
}
}
QTC::TC(
"qpdf",
"QPDFObjectHandle found old angle",
searched_parent ? 0 : 1);
if ((old_angle % 90) != 0) {
old_angle = 0;
}
new_angle += old_angle;
}
new_angle = (new_angle + 360) % 360;
// Make this explicit even with new_angle == 0 since /Rotate can
// be inherited.
replaceKey("/Rotate", QPDFObjectHandle::newInteger(new_angle));
}
void
QPDFObjectHandle::coalesceContentStreams()
{
QPDFObjectHandle contents = this->getKey("/Contents");
if (contents.isStream()) {
QTC::TC("qpdf", "QPDFObjectHandle coalesce called on stream");
return;
} else if (!contents.isArray()) {
// /Contents is optional for pages, and some very damaged
// files may have pages that are invalid in other ways.
return;
}
// Should not be possible for a page object to not have an
// owning PDF unless it was manually constructed in some
// incorrect way. However, it can happen in a PDF file whose
// page structure is direct, which is against spec but still
// possible to hand construct, as in fuzz issue 27393.
QPDF* qpdf = getOwningQPDF(
false,
"coalesceContentStreams called on object with no associated PDF file");
QPDFObjectHandle new_contents = newStream(qpdf);
this->replaceKey("/Contents", new_contents);
auto provider = std::shared_ptr<StreamDataProvider>(
new CoalesceProvider(*this, contents));
new_contents.replaceStreamData(provider, newNull(), newNull());
}
std::string
QPDFObjectHandle::unparse()
{
std::string result;
if (this->isIndirect()) {
result = getObjGen().unparse(' ') + " R";
} else {
result = unparseResolved();
}
return result;
}
std::string
QPDFObjectHandle::unparseResolved()
{
if (!dereference()) {
throw std::logic_error(
"attempted to dereference an uninitialized QPDFObjectHandle");
}
return obj->unparse();
}
std::string
QPDFObjectHandle::unparseBinary()
{
auto str = asString();
if (str) {
return str->unparse(true);
} else {
return unparse();
}
}
// Deprecated versionless getJSON to be removed in qpdf 12
JSON
QPDFObjectHandle::getJSON(bool dereference_indirect)
{
return getJSON(1, dereference_indirect);
}
JSON
QPDFObjectHandle::getJSON(int json_version, bool dereference_indirect)
{
if ((!dereference_indirect) && isIndirect()) {
return JSON::makeString(unparse());
} else if (!dereference()) {
throw std::logic_error(
"attempted to dereference an uninitialized QPDFObjectHandle");
} else {
return obj->getJSON(json_version);
}
}
JSON
QPDFObjectHandle::getStreamJSON(
int json_version,
qpdf_json_stream_data_e json_data,
qpdf_stream_decode_level_e decode_level,
Pipeline* p,
std::string const& data_filename)
{
return asStreamWithAssert()->getStreamJSON(
json_version, json_data, decode_level, p, data_filename);
}
QPDFObjectHandle
QPDFObjectHandle::wrapInArray()
{
if (isArray()) {
return *this;
}
QPDFObjectHandle result = QPDFObjectHandle::newArray();
result.appendItem(*this);
return result;
}
QPDFObjectHandle
QPDFObjectHandle::parse(
std::string const& object_str, std::string const& object_description)
{
return parse(nullptr, object_str, object_description);
}
QPDFObjectHandle
QPDFObjectHandle::parse(
QPDF* context,
std::string const& object_str,
std::string const& object_description)
{
auto input = std::shared_ptr<InputSource>(
new BufferInputSource("parsed object", object_str));
QPDFTokenizer tokenizer;
bool empty = false;
QPDFObjectHandle result =
parse(input, object_description, tokenizer, empty, nullptr, context);
size_t offset = QIntC::to_size(input->tell());
while (offset < object_str.length()) {
if (!isspace(object_str.at(offset))) {
QTC::TC("qpdf", "QPDFObjectHandle trailing data in parse");
throw QPDFExc(
qpdf_e_damaged_pdf,
input->getName(),
object_description,
input->getLastOffset(),
"trailing data found parsing object from string");
}
++offset;
}
return result;
}
void
QPDFObjectHandle::pipePageContents(Pipeline* p)
{
std::string description = "page object " + getObjGen().unparse(' ');
std::string all_description;
this->getKey("/Contents")
.pipeContentStreams(p, description, all_description);
}
void
QPDFObjectHandle::pipeContentStreams(
Pipeline* p, std::string const& description, std::string& all_description)
{
std::vector<QPDFObjectHandle> streams =
arrayOrStreamToStreamArray(description, all_description);
bool need_newline = false;
Pl_Buffer buf("concatenated content stream buffer");
for (auto stream: streams) {
if (need_newline) {
buf.writeCStr("\n");
}
LastChar lc(&buf);
if (!stream.pipeStreamData(&lc, 0, qpdf_dl_specialized)) {
QTC::TC("qpdf", "QPDFObjectHandle errors in parsecontent");
throw QPDFExc(
qpdf_e_damaged_pdf,
"content stream",
"content stream object " + stream.getObjGen().unparse(' '),
0,
"errors while decoding content stream");
}
lc.finish();
need_newline = (lc.getLastChar() != static_cast<unsigned char>('\n'));
QTC::TC("qpdf", "QPDFObjectHandle need_newline", need_newline ? 0 : 1);
}
std::unique_ptr<Buffer> b(buf.getBuffer());
p->write(b->getBuffer(), b->getSize());
p->finish();
}
void
QPDFObjectHandle::parsePageContents(ParserCallbacks* callbacks)
{
std::string description = "page object " + getObjGen().unparse(' ');
this->getKey("/Contents")
.parseContentStream_internal(description, callbacks);
}
void
QPDFObjectHandle::parseAsContents(ParserCallbacks* callbacks)
{
std::string description = "object " + getObjGen().unparse(' ');
this->parseContentStream_internal(description, callbacks);
}
void
QPDFObjectHandle::filterPageContents(TokenFilter* filter, Pipeline* next)
{
auto description =
"token filter for page object " + getObjGen().unparse(' ');
Pl_QPDFTokenizer token_pipeline(description.c_str(), filter, next);
this->pipePageContents(&token_pipeline);
}
void
QPDFObjectHandle::filterAsContents(TokenFilter* filter, Pipeline* next)
{
auto description = "token filter for object " + getObjGen().unparse(' ');
Pl_QPDFTokenizer token_pipeline(description.c_str(), filter, next);
this->pipeStreamData(&token_pipeline, 0, qpdf_dl_specialized);
}
void
QPDFObjectHandle::parseContentStream(
QPDFObjectHandle stream_or_array, ParserCallbacks* callbacks)
{
stream_or_array.parseContentStream_internal(
"content stream objects", callbacks);
}
void
QPDFObjectHandle::parseContentStream_internal(
std::string const& description, ParserCallbacks* callbacks)
{
Pl_Buffer buf("concatenated stream data buffer");
std::string all_description;
pipeContentStreams(&buf, description, all_description);
auto stream_data = buf.getBufferSharedPointer();
callbacks->contentSize(stream_data->getSize());
try {
parseContentStream_data(
stream_data, all_description, callbacks, getOwningQPDF());
} catch (TerminateParsing&) {
return;
}
callbacks->handleEOF();
}
void
QPDFObjectHandle::parseContentStream_data(
std::shared_ptr<Buffer> stream_data,
std::string const& description,
ParserCallbacks* callbacks,
QPDF* context)
{
size_t stream_length = stream_data->getSize();
auto input = std::shared_ptr<InputSource>(
new BufferInputSource(description, stream_data.get()));
QPDFTokenizer tokenizer;
tokenizer.allowEOF();
bool empty = false;
while (QIntC::to_size(input->tell()) < stream_length) {
// Read a token and seek to the beginning. The offset we get
// from this process is the beginning of the next
// non-ignorable (space, comment) token. This way, the offset
// and don't including ignorable content.
tokenizer.readToken(input, "content", true);
qpdf_offset_t offset = input->getLastOffset();
input->seek(offset, SEEK_SET);
auto obj = QPDFParser(input, "content", tokenizer, nullptr, context)
.parse(empty, true);
if (!obj.isInitialized()) {
// EOF
break;
}
size_t length = QIntC::to_size(input->tell() - offset);
callbacks->handleObject(obj, QIntC::to_size(offset), length);
if (obj.isOperator() && (obj.getOperatorValue() == "ID")) {
// Discard next character; it is the space after ID that
// terminated the token. Read until end of inline image.
char ch;
input->read(&ch, 1);
tokenizer.expectInlineImage(input);
QPDFTokenizer::Token t =
tokenizer.readToken(input, description, true);
offset = input->getLastOffset();
length = QIntC::to_size(input->tell() - offset);
if (t.getType() == QPDFTokenizer::tt_bad) {
QTC::TC("qpdf", "QPDFObjectHandle EOF in inline image");
warn(
context,
QPDFExc(
qpdf_e_damaged_pdf,
input->getName(),
"stream data",
input->tell(),
"EOF found while reading inline image"));
} else {
std::string inline_image = t.getValue();
QTC::TC("qpdf", "QPDFObjectHandle inline image token");
callbacks->handleObject(
QPDFObjectHandle::newInlineImage(inline_image),
QIntC::to_size(offset),
length);
}
}
}
}
void
QPDFObjectHandle::addContentTokenFilter(std::shared_ptr<TokenFilter> filter)
{
coalesceContentStreams();
this->getKey("/Contents").addTokenFilter(filter);
}
void
QPDFObjectHandle::addTokenFilter(std::shared_ptr<TokenFilter> filter)
{
return asStreamWithAssert()->addTokenFilter(filter);
}
QPDFObjectHandle
QPDFObjectHandle::parse(
std::shared_ptr<InputSource> input,
std::string const& object_description,
QPDFTokenizer& tokenizer,
bool& empty,
StringDecrypter* decrypter,
QPDF* context)
{
return QPDFParser(input, object_description, tokenizer, decrypter, context)
.parse(empty, false);
}
qpdf_offset_t
QPDFObjectHandle::getParsedOffset()
{
if (dereference()) {
return this->obj->getParsedOffset();
} else {
return -1;
}
}
QPDFObjectHandle
QPDFObjectHandle::newBool(bool value)
{
return QPDFObjectHandle(QPDF_Bool::create(value));
}
QPDFObjectHandle
QPDFObjectHandle::newNull()
{
return QPDFObjectHandle(QPDF_Null::create());
}
QPDFObjectHandle
QPDFObjectHandle::newInteger(long long value)
{
return QPDFObjectHandle(QPDF_Integer::create(value));
}
QPDFObjectHandle
QPDFObjectHandle::newReal(std::string const& value)
{
return QPDFObjectHandle(QPDF_Real::create(value));
}
QPDFObjectHandle
QPDFObjectHandle::newReal(
double value, int decimal_places, bool trim_trailing_zeroes)
{
return QPDFObjectHandle(
QPDF_Real::create(value, decimal_places, trim_trailing_zeroes));
}
QPDFObjectHandle
QPDFObjectHandle::newName(std::string const& name)
{
return QPDFObjectHandle(QPDF_Name::create(name));
}
QPDFObjectHandle
QPDFObjectHandle::newString(std::string const& str)
{
return QPDFObjectHandle(QPDF_String::create(str));
}
QPDFObjectHandle
QPDFObjectHandle::newUnicodeString(std::string const& utf8_str)
{
return QPDFObjectHandle(QPDF_String::create_utf16(utf8_str));
}
QPDFObjectHandle
QPDFObjectHandle::newOperator(std::string const& value)
{
return QPDFObjectHandle(QPDF_Operator::create(value));
}
QPDFObjectHandle
QPDFObjectHandle::newInlineImage(std::string const& value)
{
return QPDFObjectHandle(QPDF_InlineImage::create(value));
}
QPDFObjectHandle
QPDFObjectHandle::newArray()
{
return newArray(std::vector<QPDFObjectHandle>());
}
QPDFObjectHandle
QPDFObjectHandle::newArray(std::vector<QPDFObjectHandle> const& items)
{
return QPDFObjectHandle(QPDF_Array::create(items));
}
QPDFObjectHandle
QPDFObjectHandle::newArray(Rectangle const& rect)
{
std::vector<QPDFObjectHandle> items;
items.push_back(newReal(rect.llx));
items.push_back(newReal(rect.lly));
items.push_back(newReal(rect.urx));
items.push_back(newReal(rect.ury));
return newArray(items);
}
QPDFObjectHandle
QPDFObjectHandle::newArray(Matrix const& matrix)
{
std::vector<QPDFObjectHandle> items;
items.push_back(newReal(matrix.a));
items.push_back(newReal(matrix.b));
items.push_back(newReal(matrix.c));
items.push_back(newReal(matrix.d));
items.push_back(newReal(matrix.e));
items.push_back(newReal(matrix.f));
return newArray(items);
}
QPDFObjectHandle
QPDFObjectHandle::newArray(QPDFMatrix const& matrix)
{
std::vector<QPDFObjectHandle> items;
items.push_back(newReal(matrix.a));
items.push_back(newReal(matrix.b));
items.push_back(newReal(matrix.c));
items.push_back(newReal(matrix.d));
items.push_back(newReal(matrix.e));
items.push_back(newReal(matrix.f));
return newArray(items);
}
QPDFObjectHandle
QPDFObjectHandle::newFromRectangle(Rectangle const& rect)
{
return newArray(rect);
}
QPDFObjectHandle
QPDFObjectHandle::newFromMatrix(Matrix const& m)
{
return newArray(m);
}
QPDFObjectHandle
QPDFObjectHandle::newFromMatrix(QPDFMatrix const& m)
{
return newArray(m);
}
QPDFObjectHandle
QPDFObjectHandle::newDictionary()
{
return newDictionary(std::map<std::string, QPDFObjectHandle>());
}
QPDFObjectHandle
QPDFObjectHandle::newDictionary(
std::map<std::string, QPDFObjectHandle> const& items)
{
return QPDFObjectHandle(QPDF_Dictionary::create(items));
}
QPDFObjectHandle
QPDFObjectHandle::newStream(
QPDF* qpdf,
QPDFObjGen const& og,
QPDFObjectHandle stream_dict,
qpdf_offset_t offset,
size_t length)
{
QPDFObjectHandle result = QPDFObjectHandle(
QPDF_Stream::create(qpdf, og, stream_dict, offset, length));
if (offset) {
result.setParsedOffset(offset);
}
return result;
}
QPDFObjectHandle
QPDFObjectHandle::newStream(QPDF* qpdf)
{
if (qpdf == nullptr) {
throw std::runtime_error(
"attempt to create stream in null qpdf object");
}
QTC::TC("qpdf", "QPDFObjectHandle newStream");
QPDFObjectHandle stream_dict = newDictionary();
QPDFObjectHandle result = qpdf->makeIndirectObject(QPDFObjectHandle(
QPDF_Stream::create(qpdf, QPDFObjGen(), stream_dict, 0, 0)));
auto stream = result.asStream();
stream->setObjGen(result.getObjGen());
return result;
}
QPDFObjectHandle
QPDFObjectHandle::newStream(QPDF* qpdf, std::shared_ptr<Buffer> data)
{
QTC::TC("qpdf", "QPDFObjectHandle newStream with data");
QPDFObjectHandle result = newStream(qpdf);
result.replaceStreamData(data, newNull(), newNull());
return result;
}
QPDFObjectHandle
QPDFObjectHandle::newStream(QPDF* qpdf, std::string const& data)
{
QTC::TC("qpdf", "QPDFObjectHandle newStream with string");
QPDFObjectHandle result = newStream(qpdf);
result.replaceStreamData(data, newNull(), newNull());
return result;
}
QPDFObjectHandle
QPDFObjectHandle::newReserved(QPDF* qpdf)
{
return qpdf->makeIndirectObject(QPDFObjectHandle(QPDF_Reserved::create()));
}
void
QPDFObjectHandle::setObjectDescription(
QPDF* owning_qpdf, std::string const& object_description)
{
// This is called during parsing on newly created direct objects,
// so we can't call dereference() here.
if (isInitialized() && obj.get()) {
obj->setDescription(owning_qpdf, object_description);
}
}
bool
QPDFObjectHandle::hasObjectDescription()
{
return dereference() && obj.get() && obj->hasDescription();
}
QPDFObjectHandle
QPDFObjectHandle::shallowCopy()
{
QPDFObjectHandle result;
shallowCopyInternal(result, false);
return result;
}
QPDFObjectHandle
QPDFObjectHandle::unsafeShallowCopy()
{
QPDFObjectHandle result;
shallowCopyInternal(result, true);
return result;
}
void
QPDFObjectHandle::shallowCopyInternal(
QPDFObjectHandle& new_obj, bool first_level_only)
{
assertInitialized();
if (isStream()) {
QTC::TC("qpdf", "QPDFObjectHandle ERR shallow copy stream");
throw std::runtime_error("attempt to make a shallow copy of a stream");
}
new_obj = QPDFObjectHandle(obj->shallowCopy());
std::set<QPDFObjGen> visited;
new_obj.copyObject(visited, false, first_level_only, false);
}
void
QPDFObjectHandle::copyObject(
std::set<QPDFObjGen>& visited,
bool cross_indirect,
bool first_level_only,
bool stop_at_streams)
{
assertInitialized();
if (isStream()) {
QTC::TC(
"qpdf", "QPDFObjectHandle copy stream", stop_at_streams ? 0 : 1);
if (stop_at_streams) {
return;
}
throw std::runtime_error(
"attempt to make a stream into a direct object");
}
auto cur_og = getObjGen();
if (cur_og.getObj() != 0) {
if (visited.count(cur_og)) {
QTC::TC("qpdf", "QPDFObjectHandle makeDirect loop");
throw std::runtime_error(
"loop detected while converting object from "
"indirect to direct");
}
visited.insert(cur_og);
}
if (isReserved()) {
throw std::logic_error("QPDFObjectHandle: attempting to make a"
" reserved object handle direct");
}
std::shared_ptr<QPDFObject> new_obj;
if (isBool() || isInteger() || isName() || isNull() || isReal() ||
isString()) {
new_obj = obj->shallowCopy();
} else if (isArray()) {
std::vector<QPDFObjectHandle> items;
auto array = asArray();
int n = array->getNItems();
for (int i = 0; i < n; ++i) {
items.push_back(array->getItem(i));
if ((!first_level_only) &&
(cross_indirect || (!items.back().isIndirect()))) {
items.back().copyObject(
visited, cross_indirect, first_level_only, stop_at_streams);
}
}
new_obj = QPDF_Array::create(items);
} else if (isDictionary()) {
std::map<std::string, QPDFObjectHandle> items;
auto dict = asDictionary();
for (auto const& key: getKeys()) {
items[key] = dict->getKey(key);
if ((!first_level_only) &&
(cross_indirect || (!items[key].isIndirect()))) {
items[key].copyObject(
visited, cross_indirect, first_level_only, stop_at_streams);
}
}
new_obj = QPDF_Dictionary::create(items);
} else {
throw std::logic_error("QPDFObjectHandle::makeDirectInternal: "
"unknown object type");
}
this->obj = new_obj;
if (cur_og.getObj()) {
visited.erase(cur_og);
}
}
QPDFObjectHandle
QPDFObjectHandle::copyStream()
{
assertStream();
QPDFObjectHandle result = newStream(this->getOwningQPDF());
QPDFObjectHandle dict = result.getDict();
QPDFObjectHandle old_dict = getDict();
for (auto& iter: QPDFDictItems(old_dict)) {
if (iter.second.isIndirect()) {
dict.replaceKey(iter.first, iter.second);
} else {
dict.replaceKey(iter.first, iter.second.shallowCopy());
}
}
QPDF::StreamCopier::copyStreamData(getOwningQPDF(), result, *this);
return result;
}
void
QPDFObjectHandle::makeDirect(bool allow_streams)
{
std::set<QPDFObjGen> visited;
copyObject(visited, true, false, allow_streams);
}
void
QPDFObjectHandle::assertInitialized() const
{
if (!isInitialized()) {
throw std::logic_error("operation attempted on uninitialized "
"QPDFObjectHandle");
}
}
void
QPDFObjectHandle::typeWarning(
char const* expected_type, std::string const& warning)
{
QPDF* context = nullptr;
std::string description;
// Type checks above guarantee that the object has been dereferenced.
// Nevertheless, dereference throws exceptions in the test suite
if (!dereference()) {
throw std::logic_error(
"attempted to dereference an uninitialized QPDFObjectHandle");
}
this->obj->getDescription(context, description);
// Null context handled by warn
warn(
context,
QPDFExc(
qpdf_e_object,
"",
description,
0,
std::string("operation for ") + expected_type +
" attempted on object of type " + getTypeName() + ": " +
warning));
}
void
QPDFObjectHandle::warnIfPossible(std::string const& warning)
{
QPDF* context = nullptr;
std::string description;
if (dereference() && obj->getDescription(context, description)) {
warn(context, QPDFExc(qpdf_e_damaged_pdf, "", description, 0, warning));
} else {
*QPDFLogger::defaultLogger()->getError() << warning << "\n";
}
}
void
QPDFObjectHandle::objectWarning(std::string const& warning)
{
QPDF* context = nullptr;
std::string description;
// Type checks above guarantee that the object has been dereferenced.
this->obj->getDescription(context, description);
// Null context handled by warn
warn(context, QPDFExc(qpdf_e_object, "", description, 0, warning));
}
void
QPDFObjectHandle::assertType(char const* type_name, bool istype)
{
if (!istype) {
throw std::runtime_error(
std::string("operation for ") + type_name +
" attempted on object of type " + getTypeName());
}
}
void
QPDFObjectHandle::assertNull()
{
assertType("null", isNull());
}
void
QPDFObjectHandle::assertBool()
{
assertType("boolean", isBool());
}
void
QPDFObjectHandle::assertInteger()
{
assertType("integer", isInteger());
}
void
QPDFObjectHandle::assertReal()
{
assertType("real", isReal());
}
void
QPDFObjectHandle::assertName()
{
assertType("name", isName());
}
void
QPDFObjectHandle::assertString()
{
assertType("string", isString());
}
void
QPDFObjectHandle::assertOperator()
{
assertType("operator", isOperator());
}
void
QPDFObjectHandle::assertInlineImage()
{
assertType("inlineimage", isInlineImage());
}
void
QPDFObjectHandle::assertArray()
{
assertType("array", isArray());
}
void
QPDFObjectHandle::assertDictionary()
{
assertType("dictionary", isDictionary());
}
void
QPDFObjectHandle::assertStream()
{
assertType("stream", isStream());
}
void
QPDFObjectHandle::assertReserved()
{
assertType("reserved", isReserved());
}
void
QPDFObjectHandle::assertIndirect()
{
if (!isIndirect()) {
throw std::logic_error(
"operation for indirect object attempted on direct object");
}
}
void
QPDFObjectHandle::assertScalar()
{
assertType("scalar", isScalar());
}
void
QPDFObjectHandle::assertNumber()
{
assertType("number", isNumber());
}
bool
QPDFObjectHandle::isPageObject()
{
// See comments in QPDFObjectHandle.hh.
if (getOwningQPDF() == nullptr) {
return false;
}
// getAllPages repairs /Type when traversing the page tree.
getOwningQPDF()->getAllPages();
if (!this->isDictionary()) {
return false;
}
if (this->hasKey("/Type")) {
QPDFObjectHandle type = this->getKey("/Type");
if (type.isNameAndEquals("/Page")) {
return true;
}
// Files have been seen in the wild that have /Type (Page)
else if (type.isString() && (type.getStringValue() == "Page")) {
return true;
} else {
return false;
}
}
return false;
}
bool
QPDFObjectHandle::isPagesObject()
{
if (getOwningQPDF() == nullptr) {
return false;
}
// getAllPages repairs /Type when traversing the page tree.
getOwningQPDF()->getAllPages();
return isDictionaryOfType("/Pages");
}
bool
QPDFObjectHandle::isFormXObject()
{
return isStreamOfType("", "/Form");
}
bool
QPDFObjectHandle::isImage(bool exclude_imagemask)
{
return (
isStreamOfType("", "/Image") &&
((!exclude_imagemask) ||
(!(getDict().getKey("/ImageMask").isBool() &&
getDict().getKey("/ImageMask").getBoolValue()))));
}
void
QPDFObjectHandle::checkOwnership(QPDFObjectHandle const& item) const
{
auto qpdf = getOwningQPDF();
auto item_qpdf = item.getOwningQPDF();
if ((qpdf != nullptr) && (item_qpdf != nullptr) && (qpdf != item_qpdf)) {
QTC::TC("qpdf", "QPDFObjectHandle check ownership");
throw std::logic_error(
"Attempting to add an object from a different QPDF."
" Use QPDF::copyForeignObject to add objects from another file.");
}
}
void
QPDFObjectHandle::assertPageObject()
{
if (!isPageObject()) {
throw std::runtime_error("page operation called on non-Page object");
}
}
bool
QPDFObjectHandle::dereference()
{
if (!isInitialized()) {
return false;
}
this->obj->resolve();
return true;
}
void
QPDFObjectHandle::warn(QPDF* qpdf, QPDFExc const& e)
{
// If parsing on behalf of a QPDF object and want to give a
// warning, we can warn through the object. If parsing for some
// other reason, such as an explicit creation of an object from a
// string, then just throw the exception.
if (qpdf) {
qpdf->warn(e);
} else {
throw e;
}
}
QPDFObjectHandle::QPDFDictItems::QPDFDictItems(QPDFObjectHandle const& oh) :
oh(oh)
{
}
QPDFObjectHandle::QPDFDictItems::iterator&
QPDFObjectHandle::QPDFDictItems::iterator::operator++()
{
++this->m->iter;
updateIValue();
return *this;
}
QPDFObjectHandle::QPDFDictItems::iterator&
QPDFObjectHandle::QPDFDictItems::iterator::operator--()
{
--this->m->iter;
updateIValue();
return *this;
}
QPDFObjectHandle::QPDFDictItems::iterator::reference
QPDFObjectHandle::QPDFDictItems::iterator::operator*()
{
updateIValue();
return this->ivalue;
}
QPDFObjectHandle::QPDFDictItems::iterator::pointer
QPDFObjectHandle::QPDFDictItems::iterator::operator->()
{
updateIValue();
return &this->ivalue;
}
bool
QPDFObjectHandle::QPDFDictItems::iterator::operator==(
iterator const& other) const
{
if (this->m->is_end && other.m->is_end) {
return true;
}
if (this->m->is_end || other.m->is_end) {
return false;
}
return (this->ivalue.first == other.ivalue.first);
}
QPDFObjectHandle::QPDFDictItems::iterator::iterator(
QPDFObjectHandle& oh, bool for_begin) :
m(new Members(oh, for_begin))
{
updateIValue();
}
void
QPDFObjectHandle::QPDFDictItems::iterator::updateIValue()
{
this->m->is_end = (this->m->iter == this->m->keys.end());
if (this->m->is_end) {
this->ivalue.first = "";
this->ivalue.second = QPDFObjectHandle();
} else {
this->ivalue.first = *(this->m->iter);
this->ivalue.second = this->m->oh.getKey(this->ivalue.first);
}
}
QPDFObjectHandle::QPDFDictItems::iterator::Members::Members(
QPDFObjectHandle& oh, bool for_begin) :
oh(oh)
{
this->keys = oh.getKeys();
this->iter = for_begin ? this->keys.begin() : this->keys.end();
}
QPDFObjectHandle::QPDFDictItems::iterator
QPDFObjectHandle::QPDFDictItems::begin()
{
return iterator(oh, true);
}
QPDFObjectHandle::QPDFDictItems::iterator
QPDFObjectHandle::QPDFDictItems::end()
{
return iterator(oh, false);
}
QPDFObjectHandle::QPDFArrayItems::QPDFArrayItems(QPDFObjectHandle const& oh) :
oh(oh)
{
}
QPDFObjectHandle::QPDFArrayItems::iterator&
QPDFObjectHandle::QPDFArrayItems::iterator::operator++()
{
if (!this->m->is_end) {
++this->m->item_number;
updateIValue();
}
return *this;
}
QPDFObjectHandle::QPDFArrayItems::iterator&
QPDFObjectHandle::QPDFArrayItems::iterator::operator--()
{
if (this->m->item_number > 0) {
--this->m->item_number;
updateIValue();
}
return *this;
}
QPDFObjectHandle::QPDFArrayItems::iterator::reference
QPDFObjectHandle::QPDFArrayItems::iterator::operator*()
{
updateIValue();
return this->ivalue;
}
QPDFObjectHandle::QPDFArrayItems::iterator::pointer
QPDFObjectHandle::QPDFArrayItems::iterator::operator->()
{
updateIValue();
return &this->ivalue;
}
bool
QPDFObjectHandle::QPDFArrayItems::iterator::operator==(
iterator const& other) const
{
return (this->m->item_number == other.m->item_number);
}
QPDFObjectHandle::QPDFArrayItems::iterator::iterator(
QPDFObjectHandle& oh, bool for_begin) :
m(new Members(oh, for_begin))
{
updateIValue();
}
void
QPDFObjectHandle::QPDFArrayItems::iterator::updateIValue()
{
this->m->is_end = (this->m->item_number >= this->m->oh.getArrayNItems());
if (this->m->is_end) {
this->ivalue = QPDFObjectHandle();
} else {
this->ivalue = this->m->oh.getArrayItem(this->m->item_number);
}
}
QPDFObjectHandle::QPDFArrayItems::iterator::Members::Members(
QPDFObjectHandle& oh, bool for_begin) :
oh(oh)
{
this->item_number = for_begin ? 0 : oh.getArrayNItems();
}
QPDFObjectHandle::QPDFArrayItems::iterator
QPDFObjectHandle::QPDFArrayItems::begin()
{
return iterator(oh, true);
}
QPDFObjectHandle::QPDFArrayItems::iterator
QPDFObjectHandle::QPDFArrayItems::end()
{
return iterator(oh, false);
}
QPDFObjGen
QPDFObjectHandle::getObjGen() const
{
return isInitialized() ? obj->getObjGen() : QPDFObjGen();
}
// Indirect object accessors
QPDF*
QPDFObjectHandle::getOwningQPDF(
bool allow_nullptr, std::string const& error_msg) const
{
// Will be null for direct objects
auto result = isInitialized() ? this->obj->getQPDF() : nullptr;
if (!allow_nullptr && (result == nullptr)) {
throw std::runtime_error(
error_msg == "" ? "attempt to use a null qpdf object" : error_msg);
}
return result;
}
void
QPDFObjectHandle::setParsedOffset(qpdf_offset_t offset)
{
// This is called during parsing on newly created direct objects,
// so we can't call dereference() here.
if (isInitialized()) {
this->obj->setParsedOffset(offset);
}
}
QPDFObjectHandle operator""_qpdf(char const* v, size_t len)
{
return QPDFObjectHandle::parse(
std::string(v, len), "QPDFObjectHandle literal");
}
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