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Refactor the creation of unresolved objects
Create unresolved objects only for objects in the xref table (except during parsing of the xref table). Do not add indirect nulls into the the object cache as the result of a cache miss during a call to getObject except during parsing or creation/updating from JSON. To support this behaviour, add new private methods getObjectForParser and getObjectForJSON. As a result of this change, dangling references are treated as direct nulls rather than indirect nulls.
This commit is contained in:
m-holger
m-holger
parent
87ee8ad071
commit
06001ed25b
@ -819,7 +819,8 @@ class QPDF
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}
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};
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// The ParseGuard class allows QPDFParser to detect re-entrant parsing.
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// The ParseGuard class allows QPDFParser to detect re-entrant parsing. It also provides
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// special access to allow the parser to create unresolved objects and dangling references.
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class ParseGuard
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{
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friend class QPDFParser;
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@ -832,6 +833,13 @@ class QPDF
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qpdf->inParse(true);
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}
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}
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static std::shared_ptr<QPDFObject>
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getObject(QPDF* qpdf, int id, int gen, bool parse_pdf)
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{
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return qpdf->getObjectForParser(id, gen, parse_pdf);
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}
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~ParseGuard()
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{
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if (qpdf) {
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@ -900,8 +908,8 @@ class QPDF
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}
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ObjCache(
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std::shared_ptr<QPDFObject> object,
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qpdf_offset_t end_before_space,
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qpdf_offset_t end_after_space) :
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qpdf_offset_t end_before_space = 0,
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qpdf_offset_t end_after_space = 0) :
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object(object),
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end_before_space(end_before_space),
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end_after_space(end_after_space)
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@ -1065,13 +1073,14 @@ class QPDF
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QPDFObject* resolve(QPDFObjGen og);
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void resolveObjectsInStream(int obj_stream_number);
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void stopOnError(std::string const& message);
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QPDFObjectHandle reserveObjectIfNotExists(QPDFObjGen const& og);
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QPDFObjectHandle reserveStream(QPDFObjGen const& og);
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QPDFObjGen nextObjGen();
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QPDFObjectHandle newIndirect(QPDFObjGen const&, std::shared_ptr<QPDFObject> const&);
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QPDFObjectHandle makeIndirectFromQPDFObject(std::shared_ptr<QPDFObject> const& obj);
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bool isCached(QPDFObjGen const& og);
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bool isUnresolved(QPDFObjGen const& og);
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std::shared_ptr<QPDFObject> getObjectForParser(int id, int gen, bool parse_pdf);
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std::shared_ptr<QPDFObject> getObjectForJSON(int id, int gen);
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void removeObject(QPDFObjGen og);
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void updateCache(
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QPDFObjGen const& og,
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@ -654,9 +654,11 @@ QPDF::reconstruct_xref(QPDFExc& e)
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}
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check_warnings();
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if (!m->parsed) {
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m->parsed = true;
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getAllPages();
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check_warnings();
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if (m->all_pages.empty()) {
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m->parsed = false;
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throw damagedPDF("", 0, "unable to find any pages while recovering damaged file");
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}
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}
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@ -2095,31 +2097,53 @@ QPDF::newStream(std::string const& data)
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return result;
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}
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QPDFObjectHandle
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QPDF::reserveObjectIfNotExists(QPDFObjGen const& og)
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{
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if (!isCached(og) && m->xref_table.count(og) == 0) {
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updateCache(og, QPDF_Reserved::create(), -1, -1);
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return newIndirect(og, m->obj_cache[og].object);
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} else {
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return getObject(og);
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}
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}
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QPDFObjectHandle
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QPDF::reserveStream(QPDFObjGen const& og)
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{
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return {QPDF_Stream::create(this, og, QPDFObjectHandle::newDictionary(), 0, 0)};
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}
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std::shared_ptr<QPDFObject>
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QPDF::getObjectForParser(int id, int gen, bool parse_pdf)
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{
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// This method is called by the parser and therefore must not resolve any objects.
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auto og = QPDFObjGen(id, gen);
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if (auto iter = m->obj_cache.find(og); iter != m->obj_cache.end()) {
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return iter->second.object;
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}
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if (m->xref_table.count(og) || !m->parsed) {
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return m->obj_cache.insert({og, QPDF_Unresolved::create(this, og)}).first->second.object;
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}
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if (parse_pdf) {
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return QPDF_Null::create();
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}
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return m->obj_cache.insert({og, QPDF_Null::create(this, og)}).first->second.object;
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}
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std::shared_ptr<QPDFObject>
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QPDF::getObjectForJSON(int id, int gen)
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{
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auto og = QPDFObjGen(id, gen);
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auto [it, inserted] = m->obj_cache.try_emplace(og);
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auto& obj = it->second.object;
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if (inserted) {
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obj = (m->parsed && !m->xref_table.count(og)) ? QPDF_Null::create(this, og)
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: QPDF_Unresolved::create(this, og);
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}
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return obj;
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}
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QPDFObjectHandle
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QPDF::getObject(QPDFObjGen const& og)
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{
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// This method is called by the parser and therefore must not resolve any objects.
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if (!isCached(og)) {
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m->obj_cache[og] = ObjCache(QPDF_Unresolved::create(this, og), -1, -1);
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if (auto it = m->obj_cache.find(og); it != m->obj_cache.end()) {
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return {it->second.object};
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} else if (m->parsed && !m->xref_table.count(og)) {
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return QPDF_Null::create();
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} else {
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auto result = m->obj_cache.try_emplace(og, QPDF_Unresolved::create(this, og), -1, -1);
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return {result.first->second.object};
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}
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return newIndirect(og, m->obj_cache[og].object);
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}
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QPDFObjectHandle
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@ -166,10 +166,7 @@ QPDFParser::parseRemainder(bool content_stream)
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auto id = QIntC::to_int(int_buffer[(int_count - 1) % 2]);
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auto gen = QIntC::to_int(int_buffer[(int_count) % 2]);
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if (!(id < 1 || gen < 0 || gen >= 65535)) {
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// This action has the desirable side effect of causing dangling references
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// (references to indirect objects that don't appear in the PDF) in any parsed
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// object to appear in the object cache.
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add(std::move(context->getObject(id, gen).obj));
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add(QPDF::ParseGuard::getObject(context, id, gen, parse_pdf));
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} else {
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QTC::TC("qpdf", "QPDFParser invalid objgen");
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addNull();
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@ -1237,7 +1237,7 @@ bool
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QPDFWriter::willFilterStream(
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QPDFObjectHandle stream,
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bool& compress_stream, // out only
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bool& is_metadata, // out only
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bool& is_metadata, // out only
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std::shared_ptr<Buffer>* stream_data)
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{
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compress_stream = false;
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@ -3,15 +3,15 @@
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#include <qpdf/JSON_writer.hh>
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#include <qpdf/QPDFObject_private.hh>
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QPDF_Null::QPDF_Null() :
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QPDFValue(::ot_null, "null")
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QPDF_Null::QPDF_Null(QPDF* qpdf, QPDFObjGen og) :
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QPDFValue(::ot_null, "null", qpdf, og)
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{
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}
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std::shared_ptr<QPDFObject>
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QPDF_Null::create()
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QPDF_Null::create(QPDF* qpdf, QPDFObjGen og)
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{
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return do_create(new QPDF_Null());
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return do_create(new QPDF_Null(qpdf, og));
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}
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std::shared_ptr<QPDFObject>
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@ -240,11 +240,6 @@ class QPDF::JSONReactor: public JSON::Reactor
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descr(std::make_shared<QPDFValue::Description>(
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QPDFValue::JSON_Descr(std::make_shared<std::string>(is->getName()), "")))
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{
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for (auto& oc: pdf.m->obj_cache) {
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if (oc.second.object->getTypeCode() == ::ot_reserved) {
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reserved.insert(oc.first);
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}
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}
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}
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~JSONReactor() override = default;
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void dictionaryStart() override;
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@ -305,7 +300,6 @@ class QPDF::JSONReactor: public JSON::Reactor
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bool saw_data{false};
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bool saw_datafile{false};
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bool this_stream_needs_data{false};
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std::set<QPDFObjGen> reserved;
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std::vector<StackFrame> stack;
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QPDFObjectHandle next_obj;
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state_e next_state{st_top};
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@ -416,16 +410,6 @@ QPDF::JSONReactor::containerEnd(JSON const& value)
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}
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}
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}
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} else if (from_state == st_qpdf) {
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// Handle dangling indirect object references which the PDF spec says to treat as nulls.
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// It's tempting to make this an error, but that would be wrong since valid input files may
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// have these.
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for (auto& oc: pdf.m->obj_cache) {
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if (oc.second.object->getTypeCode() == ::ot_reserved && reserved.count(oc.first) == 0) {
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QTC::TC("qpdf", "QPDF_json non-trivial null reserved");
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pdf.updateCache(oc.first, QPDF_Null::create(), -1, -1);
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}
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}
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}
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if (!stack.empty()) {
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auto state = stack.back().state;
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@ -565,7 +549,7 @@ QPDF::JSONReactor::dictionaryItem(std::string const& key, JSON const& value)
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} else if (is_obj_key(key, obj, gen)) {
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this->cur_object = key;
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if (setNextStateIfDictionary(key, value, st_object_top)) {
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next_obj = pdf.reserveObjectIfNotExists(QPDFObjGen(obj, gen));
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next_obj = pdf.getObjectForJSON(obj, gen);
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}
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} else {
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QTC::TC("qpdf", "QPDF_json bad object key");
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@ -767,7 +751,7 @@ QPDF::JSONReactor::makeObject(JSON const& value)
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int gen = 0;
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std::string str;
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if (is_indirect_object(str_v, obj, gen)) {
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result = pdf.reserveObjectIfNotExists(QPDFObjGen(obj, gen));
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result = pdf.getObjectForJSON(obj, gen);
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} else if (is_unicode_string(str_v, str)) {
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result = QPDFObjectHandle::newUnicodeString(str);
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} else if (is_binary_string(str_v, str)) {
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@ -24,7 +24,8 @@ class QPDFParser
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decrypter(decrypter),
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context(context),
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description(std::make_shared<QPDFValue::Description>(
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std::string(input->getName() + ", " + object_description + " at offset $PO")))
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std::string(input->getName() + ", " + object_description + " at offset $PO"))),
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parse_pdf(parse_pdf)
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{
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}
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virtual ~QPDFParser() = default;
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@ -77,6 +78,8 @@ class QPDFParser
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QPDFObjectHandle::StringDecrypter* decrypter;
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QPDF* context;
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std::shared_ptr<QPDFValue::Description> description;
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bool parse_pdf;
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std::vector<StackFrame> stack;
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StackFrame* frame;
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// Number of recent bad tokens.
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@ -7,7 +7,7 @@ class QPDF_Null: public QPDFValue
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{
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public:
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~QPDF_Null() override = default;
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static std::shared_ptr<QPDFObject> create();
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static std::shared_ptr<QPDFObject> create(QPDF* qpdf = nullptr, QPDFObjGen og = QPDFObjGen());
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static std::shared_ptr<QPDFObject> create(
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std::shared_ptr<QPDFObject> parent,
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std::string_view const& static_descr,
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@ -21,7 +21,7 @@ class QPDF_Null: public QPDFValue
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void writeJSON(int json_version, JSON::Writer& p) override;
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private:
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QPDF_Null();
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QPDF_Null(QPDF* qpdf = nullptr, QPDFObjGen og = QPDFObjGen());
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};
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#endif // QPDF_NULL_HH
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@ -90,17 +90,17 @@ main()
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obj = QPDF_Array::create({10, "null"_qpdf.getObj()}, true);
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QPDF_Array& b = *obj->as<QPDF_Array>();
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b.setAt(5, pdf.getObject(5, 0));
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b.setAt(5, pdf.newIndirectNull());
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b.setAt(7, "[0 1 2 3]"_qpdf);
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assert(b.at(3).isNull());
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assert(b.at(8).isNull());
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assert(b.at(5).isIndirect());
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assert(b.unparse() == "[ null null null null null 5 0 R null [ 0 1 2 3 ] null null ]");
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assert(b.unparse() == "[ null null null null null 3 0 R null [ 0 1 2 3 ] null null ]");
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auto c = b.copy(true);
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auto d = b.copy(false);
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b.at(7).setArrayItem(2, "42"_qpdf);
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assert(c->unparse() == "[ null null null null null 5 0 R null [ 0 1 42 3 ] null null ]");
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assert(d->unparse() == "[ null null null null null 5 0 R null [ 0 1 2 3 ] null null ]");
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assert(c->unparse() == "[ null null null null null 3 0 R null [ 0 1 42 3 ] null null ]");
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assert(d->unparse() == "[ null null null null null 3 0 R null [ 0 1 2 3 ] null null ]");
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try {
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b.setAt(3, {});
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@ -675,7 +675,6 @@ QPDF_json ignore second-level key 0
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QPDF_json ignore unknown key in object_top 0
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QPDF_json ignore unknown key in trailer 0
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QPDF_json ignore unknown key in stream 0
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QPDF_json non-trivial null reserved 0
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QPDF_json data and datafile 0
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QPDF_json no stream data in update mode 0
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QPDF_json updating existing stream 0
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Binary file not shown.
@ -1,7 +1,7 @@
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WARNING: dangling-bad-xref.pdf: file is damaged
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WARNING: dangling-bad-xref.pdf (object 7 0, offset 10000): expected n n obj
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WARNING: dangling-bad-xref.pdf: Attempting to reconstruct cross-reference table
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new object: 13 0 R
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new object: 12 0 R
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all objects
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1 0 R
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2 0 R
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@ -10,10 +10,6 @@ all objects
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5 0 R
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6 0 R
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7 0 R
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8 0 R
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9 0 R
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10 0 R
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11 0 R
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12 0 R
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13 0 R
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test 53 done
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Binary file not shown.
@ -1,4 +1,4 @@
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new object: 11 0 R
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new object: 8 0 R
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all objects
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1 0 R
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2 0 R
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@ -8,7 +8,4 @@ all objects
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6 0 R
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7 0 R
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8 0 R
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9 0 R
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10 0 R
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11 0 R
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test 53 done
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@ -7,5 +7,5 @@
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/nesting is direct
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/strings is direct
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unparse: 7 0 R
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unparseResolved: << /dangling-ref-for-json-test [ 9 0 R ] /hex#20strings [ (Potato) <01020300040560> (AB) ] /indirect 8 0 R /names [ /nesting /hex#20strings /text#2fplain ] /nesting << /a [ 1 2 << /x (y) >> [ (z) ] ] /b << / (legal) /a [ 1 2 ] >> >> /strings [ (one) <24a2> () (\(\)) (\() (\)) (a\f\b\t\r\nb) (") ("") ("\("\)") <410042> (a\nb) (a b) <efbbbfcf80> <efbbbff09fa594> ] >>
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unparseResolved: << /dangling-ref-for-json-test [ null ] /hex#20strings [ (Potato) <01020300040560> (AB) ] /indirect 8 0 R /names [ /nesting /hex#20strings /text#2fplain ] /nesting << /a [ 1 2 << /x (y) >> [ (z) ] ] /b << / (legal) /a [ 1 2 ] >> >> /strings [ (one) <24a2> () (\(\)) (\() (\)) (a\f\b\t\r\nb) (") ("") ("\("\)") <410042> (a\nb) (a b) <efbbbfcf80> <efbbbff09fa594> ] >>
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test 1 done
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@ -14,14 +14,14 @@ endobj
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2 0 obj
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<<
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/dangling-ref-for-json-test [
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4 0 R
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null
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]
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/hex#20strings [
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(Potato)
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<01020300040560>
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(AB)
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]
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/indirect 5 0 R
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/indirect 4 0 R
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/names [
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/nesting
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/hex#20strings
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@ -71,27 +71,22 @@ endobj
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<<
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/Count 1
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/Kids [
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6 0 R
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5 0 R
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]
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/Type /Pages
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>>
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endobj
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%% Original object ID: 9 0
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4 0 obj
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null
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endobj
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%% Original object ID: 8 0
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5 0 obj
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4 0 obj
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(hello)
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endobj
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%% Page 1
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%% Original object ID: 3 0
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6 0 obj
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5 0 obj
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<<
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/Contents 7 0 R
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/Contents 6 0 R
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/MediaBox [
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0
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0
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@ -101,9 +96,9 @@ endobj
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/Parent 3 0 R
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/Resources <<
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/Font <<
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/F1 9 0 R
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/F1 8 0 R
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>>
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/ProcSet 10 0 R
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/ProcSet 9 0 R
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>>
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/Type /Page
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>>
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@ -111,9 +106,9 @@ endobj
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%% Contents for page 1
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%% Original object ID: 4 0
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7 0 obj
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6 0 obj
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<<
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/Length 8 0 R
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/Length 7 0 R
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>>
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stream
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BT
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@ -124,12 +119,12 @@ ET
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endstream
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endobj
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8 0 obj
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7 0 obj
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44
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endobj
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%% Original object ID: 6 0
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9 0 obj
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8 0 obj
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<<
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||||
/BaseFont /Helvetica
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startxref
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1551
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1500
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%%EOF
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Loading…
Reference in New Issue
Block a user