mirror of
https://github.com/JakubMelka/PDF4QT.git
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100 lines
3.7 KiB
C++
100 lines
3.7 KiB
C++
// MIT License
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//
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// Copyright (c) 2018-2025 Jakub Melka and Contributors
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#ifndef PDFNAMETREELOADER_H
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#define PDFNAMETREELOADER_H
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#include "pdfdocument.h"
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#include <map>
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#include <functional>
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namespace pdf
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{
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/// This class can load a number tree into the array
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template<typename Type>
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class PDFNameTreeLoader
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{
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public:
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explicit PDFNameTreeLoader() = delete;
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using MappedObjects = std::map<QByteArray, Type>;
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using LoadMethod = std::function<Type(const PDFObjectStorage*, const PDFObject&)>;
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/// Parses the name tree and loads its items into the map. Some errors are ignored,
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/// e.g. when kid is null. Objects are retrieved by \p loadMethod.
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/// \param storage Object storage
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/// \param root Root of the name tree
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/// \param loadMethod Parsing method, which retrieves parsed object
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static MappedObjects parse(const PDFObjectStorage* storage, const PDFObject& root, const LoadMethod& loadMethod)
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{
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MappedObjects result;
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parseImpl(result, storage, root, loadMethod);
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return result;
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}
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private:
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static void parseImpl(MappedObjects& objects, const PDFObjectStorage* storage, const PDFObject& root, const LoadMethod& loadMethod)
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{
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if (const PDFDictionary* dictionary = storage->getDictionaryFromObject(root))
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{
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// Jakub Melka: First, load the objects into the map
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const PDFObject& namedItems = storage->getObject(dictionary->get("Names"));
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if (namedItems.isArray())
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{
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const PDFArray* namedItemsArray = namedItems.getArray();
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const size_t count = namedItemsArray->getCount() / 2;
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for (size_t i = 0; i < count; ++i)
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{
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const size_t numberIndex = 2 * i;
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const size_t valueIndex = 2 * i + 1;
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const PDFObject& name = storage->getObject(namedItemsArray->getItem(numberIndex));
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if (!name.isString())
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{
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continue;
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}
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objects[name.getString()] = loadMethod(storage, namedItemsArray->getItem(valueIndex));
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}
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}
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// Then, follow the kids
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const PDFObject& kids = storage->getObject(dictionary->get("Kids"));
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if (kids.isArray())
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{
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const PDFArray* kidsArray = kids.getArray();
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const size_t count = kidsArray->getCount();
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for (size_t i = 0; i < count; ++i)
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{
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parseImpl(objects, storage, kidsArray->getItem(i), loadMethod);
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}
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}
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}
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}
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};
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} // namespace pdf
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#endif // PDFNAMETREELOADER_H
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