mirror of https://github.com/JakubMelka/PDF4QT.git
580 lines
17 KiB
C++
580 lines
17 KiB
C++
// Copyright (C) 2018-2021 Jakub Melka
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//
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// This file is part of PDF4QT.
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//
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// PDF4QT is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// with the written consent of the copyright owner, any later version.
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//
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// PDF4QT is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with PDF4QT. If not, see <https://www.gnu.org/licenses/>.
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#include "pdfobject.h"
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#include "pdfvisitor.h"
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namespace pdf
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{
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QByteArray PDFObject::getString() const
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{
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PDFStringRef stringRef = getStringObject();
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Q_ASSERT(stringRef.inplaceString || stringRef.memoryString);
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return stringRef.inplaceString ? stringRef.inplaceString->getString() : stringRef.memoryString->getString();
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}
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const PDFDictionary* PDFObject::getDictionary() const
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{
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const PDFObjectContentPointer& objectContent = std::get<PDFObjectContentPointer>(m_data);
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Q_ASSERT(dynamic_cast<const PDFDictionary*>(objectContent.get()));
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return static_cast<const PDFDictionary*>(objectContent.get());
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}
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PDFStringRef PDFObject::getStringObject() const
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{
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if (std::holds_alternative<PDFInplaceString>(m_data))
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{
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return { &std::get<PDFInplaceString>(m_data) , nullptr };
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}
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else
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{
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const PDFObjectContentPointer& objectContent = std::get<PDFObjectContentPointer>(m_data);
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Q_ASSERT(dynamic_cast<const PDFString*>(objectContent.get()));
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return { nullptr, static_cast<const PDFString*>(objectContent.get()) };
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}
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}
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const PDFStream* PDFObject::getStream() const
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{
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const PDFObjectContentPointer& objectContent = std::get<PDFObjectContentPointer>(m_data);
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Q_ASSERT(dynamic_cast<const PDFStream*>(objectContent.get()));
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return static_cast<const PDFStream*>(objectContent.get());
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}
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const PDFArray* PDFObject::getArray() const
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{
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const PDFObjectContentPointer& objectContent = std::get<PDFObjectContentPointer>(m_data);
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Q_ASSERT(dynamic_cast<const PDFArray*>(objectContent.get()));
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return static_cast<const PDFArray*>(objectContent.get());
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}
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bool PDFObject::operator==(const PDFObject& other) const
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{
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if (m_type == other.m_type)
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{
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if (m_type == Type::String || m_type == Type::Name)
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{
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PDFStringRef leftString = getStringObject();
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PDFStringRef rightString = other.getStringObject();
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if (leftString.inplaceString && rightString.inplaceString)
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{
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return *leftString.inplaceString == *rightString.inplaceString;
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}
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else if (leftString.memoryString && rightString.memoryString)
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{
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return leftString.memoryString->equals(rightString.memoryString);
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}
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// We have inplace string in one object and memory string in the other.
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// So they are not equal, because memory strings have always greater
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// size, than inplace strings.
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return false;
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}
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Q_ASSERT(std::holds_alternative<PDFObjectContentPointer>(m_data) == std::holds_alternative<PDFObjectContentPointer>(other.m_data));
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// If we have content object defined, then use its equal operator,
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// otherwise use default compare operator. The only problem with
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// default compare operator can occur, when we have a double
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// with NaN value. Then operator == can return false, even if
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// values are "equal" (NaN == NaN returns false)
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if (std::holds_alternative<PDFObjectContentPointer>(m_data))
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{
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Q_ASSERT(std::get<PDFObjectContentPointer>(m_data));
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return std::get<PDFObjectContentPointer>(m_data)->equals(std::get<PDFObjectContentPointer>(other.m_data).get());
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}
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return m_data == other.m_data;
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}
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return false;
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}
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void PDFObject::accept(PDFAbstractVisitor* visitor) const
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{
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switch (m_type)
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{
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case Type::Null:
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visitor->visitNull();
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break;
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case Type::Bool:
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visitor->visitBool(getBool());
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break;
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case Type::Int:
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visitor->visitInt(getInteger());
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break;
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case Type::Real:
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visitor->visitReal(getReal());
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break;
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case Type::String:
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visitor->visitString(getStringObject());
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break;
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case Type::Name:
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visitor->visitName(getStringObject());
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break;
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case Type::Array:
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visitor->visitArray(getArray());
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break;
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case Type::Dictionary:
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visitor->visitDictionary(getDictionary());
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break;
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case Type::Stream:
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visitor->visitStream(getStream());
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break;
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case Type::Reference:
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visitor->visitReference(getReference());
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break;
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default:
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Q_ASSERT(false);
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}
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}
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PDFObject PDFObject::createName(QByteArray name)
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{
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if (name.size() > PDFInplaceString::MAX_STRING_SIZE)
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{
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return PDFObject(Type::Name, std::make_shared<PDFString>(qMove(name)));
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}
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else
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{
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return PDFObject(Type::Name, PDFInplaceString(qMove(name)));
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}
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}
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PDFObject PDFObject::createString(QByteArray name)
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{
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if (name.size() > PDFInplaceString::MAX_STRING_SIZE)
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{
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return PDFObject(Type::String, std::make_shared<PDFString>(qMove(name)));
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}
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else
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{
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return PDFObject(Type::String, PDFInplaceString(qMove(name)));
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}
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}
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PDFObject PDFObject::createName(PDFStringRef name)
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{
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if (name.memoryString)
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{
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return PDFObject(Type::Name, std::make_shared<PDFString>(name.getString()));
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}
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else
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{
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return PDFObject(Type::Name, *name.inplaceString);
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}
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}
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PDFObject PDFObject::createString(PDFStringRef name)
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{
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if (name.memoryString)
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{
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return PDFObject(Type::String, std::make_shared<PDFString>(name.getString()));
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}
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else
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{
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return PDFObject(Type::String, *name.inplaceString);
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}
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}
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bool PDFString::equals(const PDFObjectContent* other) const
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{
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Q_ASSERT(dynamic_cast<const PDFString*>(other));
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const PDFString* otherString = static_cast<const PDFString*>(other);
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return m_string == otherString->m_string;
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}
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void PDFString::setString(const QByteArray& string)
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{
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m_string = string;
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}
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void PDFString::optimize()
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{
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m_string.shrink_to_fit();
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}
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bool PDFArray::equals(const PDFObjectContent* other) const
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{
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Q_ASSERT(dynamic_cast<const PDFArray*>(other));
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const PDFArray* otherArray = static_cast<const PDFArray*>(other);
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return m_objects == otherArray->m_objects;
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}
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void PDFArray::appendItem(PDFObject object)
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{
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m_objects.push_back(std::move(object));
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}
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void PDFArray::optimize()
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{
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m_objects.shrink_to_fit();
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}
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bool PDFDictionary::equals(const PDFObjectContent* other) const
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{
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Q_ASSERT(dynamic_cast<const PDFDictionary*>(other));
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const PDFDictionary* otherStream = static_cast<const PDFDictionary*>(other);
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return m_dictionary == otherStream->m_dictionary;
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}
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const PDFObject& PDFDictionary::get(const QByteArray& key) const
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{
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auto it = find(key);
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if (it != m_dictionary.cend())
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{
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return it->second;
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}
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else
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{
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static PDFObject dummy;
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return dummy;
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}
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}
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const PDFObject& PDFDictionary::get(const char* key) const
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{
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auto it = find(key);
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if (it != m_dictionary.cend())
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{
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return it->second;
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}
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else
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{
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static PDFObject dummy;
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return dummy;
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}
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}
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const PDFObject& PDFDictionary::get(const PDFInplaceOrMemoryString& key) const
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{
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auto it = find(key);
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if (it != m_dictionary.cend())
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{
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return it->second;
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}
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else
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{
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static PDFObject dummy;
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return dummy;
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}
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}
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void PDFDictionary::removeEntry(const char* key)
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{
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auto it = find(key);
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if (it != m_dictionary.end())
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{
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m_dictionary.erase(it);
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}
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}
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void PDFDictionary::setEntry(const PDFInplaceOrMemoryString& key, PDFObject&& value)
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{
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auto it = find(key);
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if (it != m_dictionary.end())
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{
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it->second = qMove(value);
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}
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else
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{
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addEntry(key, qMove(value));
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}
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}
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void PDFDictionary::removeNullObjects()
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{
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m_dictionary.erase(std::remove_if(m_dictionary.begin(), m_dictionary.end(), [](const DictionaryEntry& entry) { return entry.second.isNull(); }), m_dictionary.end());
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m_dictionary.shrink_to_fit();
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}
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void PDFDictionary::optimize()
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{
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m_dictionary.shrink_to_fit();
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}
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std::vector<PDFDictionary::DictionaryEntry>::const_iterator PDFDictionary::find(const QByteArray& key) const
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{
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return std::find_if(m_dictionary.cbegin(), m_dictionary.cend(), [&key](const DictionaryEntry& entry) { return entry.first == key; });
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}
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std::vector<PDFDictionary::DictionaryEntry>::iterator PDFDictionary::find(const QByteArray& key)
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{
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return std::find_if(m_dictionary.begin(), m_dictionary.end(), [&key](const DictionaryEntry& entry) { return entry.first == key; });
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}
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std::vector<PDFDictionary::DictionaryEntry>::const_iterator PDFDictionary::find(const char* key) const
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{
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return std::find_if(m_dictionary.cbegin(), m_dictionary.cend(), [key](const DictionaryEntry& entry) { return entry.first == key; });
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}
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std::vector<PDFDictionary::DictionaryEntry>::const_iterator PDFDictionary::find(const PDFInplaceOrMemoryString& key) const
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{
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return std::find_if(m_dictionary.cbegin(), m_dictionary.cend(), [&key](const DictionaryEntry& entry) { return entry.first == key; });
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}
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std::vector<PDFDictionary::DictionaryEntry>::iterator PDFDictionary::find(const PDFInplaceOrMemoryString& key)
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{
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return std::find_if(m_dictionary.begin(), m_dictionary.end(), [&key](const DictionaryEntry& entry) { return entry.first == key; });
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}
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std::vector<PDFDictionary::DictionaryEntry>::iterator PDFDictionary::find(const char* key)
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{
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return std::find_if(m_dictionary.begin(), m_dictionary.end(), [key](const DictionaryEntry& entry) { return entry.first == key; });
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}
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bool PDFStream::equals(const PDFObjectContent* other) const
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{
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Q_ASSERT(dynamic_cast<const PDFStream*>(other));
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const PDFStream* otherStream = static_cast<const PDFStream*>(other);
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return m_dictionary.equals(&otherStream->m_dictionary) && m_content == otherStream->m_content;
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}
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PDFObject PDFObjectManipulator::merge(PDFObject left, PDFObject right, MergeFlags flags)
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{
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const bool leftHasDictionary = left.isDictionary() || left.isStream();
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if (left.getType() != right.getType() && (leftHasDictionary != right.isDictionary()))
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{
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return right;
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}
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if (left.isStream())
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{
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Q_ASSERT(right.isDictionary() || right.isStream());
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const PDFStream* leftStream = left.getStream();
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const PDFStream* rightStream = right.isStream() ? right.getStream() : nullptr;
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PDFDictionary targetDictionary = *leftStream->getDictionary();
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const PDFDictionary& sourceDictionary = rightStream ? *rightStream->getDictionary() : *right.getDictionary();
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for (size_t i = 0, count = sourceDictionary.getCount(); i < count; ++i)
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{
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const auto& key = sourceDictionary.getKey(i);
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PDFObject value = merge(targetDictionary.get(key), sourceDictionary.getValue(i), flags);
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targetDictionary.setEntry(key, qMove(value));
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}
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if (flags.testFlag(RemoveNullObjects))
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{
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targetDictionary.removeNullObjects();
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}
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return PDFObject::createStream(std::make_shared<PDFStream>(qMove(targetDictionary), QByteArray(rightStream ? *rightStream->getContent() : *leftStream->getContent())));
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}
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if (left.isDictionary())
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{
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Q_ASSERT(right.isDictionary());
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PDFDictionary targetDictionary = *left.getDictionary();
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const PDFDictionary& sourceDictionary = *right.getDictionary();
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for (size_t i = 0, count = sourceDictionary.getCount(); i < count; ++i)
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{
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const auto& key = sourceDictionary.getKey(i);
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PDFObject value = merge(targetDictionary.get(key), sourceDictionary.getValue(i), flags);
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targetDictionary.setEntry(key, qMove(value));
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}
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if (flags.testFlag(RemoveNullObjects))
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{
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targetDictionary.removeNullObjects();
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}
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return PDFObject::createDictionary(std::make_shared<PDFDictionary>(qMove(targetDictionary)));
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}
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else if (left.isArray() && flags.testFlag(ConcatenateArrays))
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{
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// Concatenate arrays
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const PDFArray* leftArray = left.getArray();
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const PDFArray* rightArray = right.getArray();
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std::vector<PDFObject> objects;
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objects.reserve(leftArray->getCount() + rightArray->getCount());
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for (size_t i = 0, count = leftArray->getCount(); i < count; ++i)
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{
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objects.emplace_back(leftArray->getItem(i));
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}
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for (size_t i = 0, count = rightArray->getCount(); i < count; ++i)
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{
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objects.emplace_back(rightArray->getItem(i));
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}
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return PDFObject::createArray(std::make_shared<PDFArray>(qMove(objects)));
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}
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return right;
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}
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PDFObject PDFObjectManipulator::removeNullObjects(PDFObject object)
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{
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return merge(object, object, RemoveNullObjects);
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}
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PDFObject PDFObjectManipulator::removeDuplicitReferencesInArrays(PDFObject object)
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{
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switch (object.getType())
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{
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case PDFObject::Type::Stream:
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{
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const PDFStream* stream = object.getStream();
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PDFDictionary dictionary = *stream->getDictionary();
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for (size_t i = 0, count = dictionary.getCount(); i < count; ++i)
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{
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dictionary.setEntry(dictionary.getKey(i), removeDuplicitReferencesInArrays(dictionary.getValue(i)));
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}
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return PDFObject::createStream(std::make_shared<PDFStream>(qMove(dictionary), QByteArray(*stream->getContent())));
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}
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case PDFObject::Type::Dictionary:
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{
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PDFDictionary dictionary = *object.getDictionary();
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for (size_t i = 0, count = dictionary.getCount(); i < count; ++i)
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{
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dictionary.setEntry(dictionary.getKey(i), removeDuplicitReferencesInArrays(dictionary.getValue(i)));
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}
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return PDFObject::createDictionary(std::make_shared<PDFDictionary>(qMove(dictionary)));
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}
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case PDFObject::Type::Array:
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{
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PDFArray array;
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std::set<PDFObjectReference> usedReferences;
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for (const PDFObject& object : *object.getArray())
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{
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if (object.isReference())
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{
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PDFObjectReference reference = object.getReference();
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if (!usedReferences.count(reference))
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{
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usedReferences.insert(reference);
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array.appendItem(PDFObject::createReference(reference));
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}
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}
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else
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{
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array.appendItem(removeDuplicitReferencesInArrays(object));
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}
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}
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return PDFObject::createArray(std::make_shared<PDFArray>(qMove(array)));
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}
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default:
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return object;
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}
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}
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QByteArray PDFStringRef::getString() const
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{
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if (inplaceString)
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{
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return inplaceString->getString();
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}
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if (memoryString)
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{
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return memoryString->getString();
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}
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return QByteArray();
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}
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PDFInplaceOrMemoryString::PDFInplaceOrMemoryString(const char* string)
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{
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const int size = static_cast<int>(qMin(std::strlen(string), size_t(std::numeric_limits<int>::max())));
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if (size > PDFInplaceString::MAX_STRING_SIZE)
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{
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m_value = QByteArray(string, size);
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}
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else
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{
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m_value = PDFInplaceString(string, size);
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}
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}
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PDFInplaceOrMemoryString::PDFInplaceOrMemoryString(QByteArray string)
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{
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const int size = string.size();
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if (size > PDFInplaceString::MAX_STRING_SIZE)
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{
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m_value = qMove(string);
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}
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else
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{
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m_value = PDFInplaceString(qMove(string));
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}
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}
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bool PDFInplaceOrMemoryString::equals(const char* value, size_t length) const
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{
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if (std::holds_alternative<PDFInplaceString>(m_value))
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{
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const PDFInplaceString& string = std::get<PDFInplaceString>(m_value);
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return std::equal(string.string.data(), string.string.data() + string.size, value, value + length);
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}
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if (std::holds_alternative<QByteArray>(m_value))
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{
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const QByteArray& string = std::get<QByteArray>(m_value);
|
|
return std::equal(string.constData(), string.constData() + string.size(), value, value + length);
|
|
}
|
|
|
|
return length == 0;
|
|
}
|
|
|
|
bool PDFInplaceOrMemoryString::isInplace() const
|
|
{
|
|
return std::holds_alternative<PDFInplaceString>(m_value);
|
|
}
|
|
|
|
QByteArray PDFInplaceOrMemoryString::getString() const
|
|
{
|
|
if (std::holds_alternative<PDFInplaceString>(m_value))
|
|
{
|
|
return std::get<PDFInplaceString>(m_value).getString();
|
|
}
|
|
|
|
if (std::holds_alternative<QByteArray>(m_value))
|
|
{
|
|
return std::get<QByteArray>(m_value);
|
|
}
|
|
|
|
return QByteArray();
|
|
}
|
|
|
|
} // namespace pdf
|