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e17585c2d2
Converted ResourceFinder to ParserCallbacks so we can better detect the name that precedes various operators and use the operators to sort the names into resource types. This enables us to be smarter about detecting unreferenced resources in pages and also sets the stage for reconciling differences in /DR across documents.
70 lines
1.6 KiB
C++
70 lines
1.6 KiB
C++
#include <qpdf/ResourceFinder.hh>
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ResourceFinder::ResourceFinder() :
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last_name_offset(0),
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saw_bad(false)
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{
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}
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void
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ResourceFinder::handleObject(QPDFObjectHandle obj, size_t offset, size_t)
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{
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if (obj.isOperator() && (! this->last_name.empty()))
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{
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static std::map<std::string, std::string> op_to_rtype = {
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{"CS", "/ColorSpace"},
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{"cs", "/ColorSpace"},
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{"gs", "/ExtGState"},
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{"Tf", "/Font"},
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{"SCN", "/Pattern"},
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{"scn", "/Pattern"},
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{"BDC", "/Properties"},
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{"DP", "/Properties"},
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{"sh", "/Shading"},
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{"Do", "/XObject"},
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};
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std::string op = obj.getOperatorValue();
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std::string resource_type;
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auto iter = op_to_rtype.find(op);
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if (iter != op_to_rtype.end())
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{
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resource_type = iter->second;
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}
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if (! resource_type.empty())
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{
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this->names.insert(this->last_name);
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this->names_by_resource_type[
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resource_type][this->last_name].insert(this->last_name_offset);
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}
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}
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else if (obj.isName())
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{
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this->last_name = obj.getName();
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this->last_name_offset = offset;
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}
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}
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void
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ResourceFinder::handleWarning()
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{
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this->saw_bad = true;
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}
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std::set<std::string> const&
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ResourceFinder::getNames() const
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{
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return this->names;
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}
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std::map<std::string, std::map<std::string, std::set<size_t>>> const&
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ResourceFinder::getNamesByResourceType() const
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{
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return this->names_by_resource_type;
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}
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bool
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ResourceFinder::sawBad() const
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{
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return this->saw_bad;
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}
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