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104 lines
3.6 KiB
104 lines
3.6 KiB
/*
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* Copyright (C) 2015-2022 Département de l'Instruction Publique (DIP-SEM)
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*
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* Copyright (C) 2013 Open Education Foundation
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*
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* Copyright (C) 2010-2013 Groupement d'Intérêt Public pour
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* l'Education Numérique en Afrique (GIP ENA)
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*
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* This file is part of OpenBoard.
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*
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* OpenBoard is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License,
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* with a specific linking exception for the OpenSSL project's
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* "OpenSSL" library (or with modified versions of it that use the
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* same license as the "OpenSSL" library).
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*
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* OpenBoard 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with OpenBoard. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "ContentHandler.h"
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#include "Filter.h"
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#include "FlateDecode.h"
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#include <iostream>
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#include <string>
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#include <string.h>
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#include "core/memcheck.h"
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using namespace merge_lib;
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using namespace std;
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//concatenate stream of all objects which contain Content of Page
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void ContentHandler::_processObjectContent(unsigned int startOfPageElement)
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{
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unsigned int endOfPage = _findEndOfElementContent(startOfPageElement);
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_concatenatedStream = _retrieveStreamContent(_page, startOfPageElement, endOfPage);
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FlateDecode flate;
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flate.encode(_concatenatedStream);
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}
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//write concatenated stream to Page object
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void ContentHandler::_changeObjectContent(unsigned int startOfPageElement)
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{
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unsigned int endOfPage = _findEndOfElementContent(startOfPageElement);
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_page->forgetAboutChildren(startOfPageElement, endOfPage);
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_page->eraseContent(startOfPageElement, endOfPage - startOfPageElement);
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unsigned int endOfObjectDescription = _pageContent.rfind(">>");
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const char * length = "/Filter /FlateDecode\n/Length ";
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unsigned int sizeOfLength = strlen(length);
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_page->insertToContent(endOfObjectDescription, length, sizeOfLength);
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_page->insertToContent(endOfObjectDescription + sizeOfLength, Utils::uIntToStr(_concatenatedStream.size()).c_str());
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_page->appendContent("\nstream\n");
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_page->appendContent(_concatenatedStream);
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_page->appendContent("endstream\n");
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_page->forgetStreamInFile();
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}
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//get content of stream
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// object - object with stream
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//leftBound - left bound of object's content
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//rightBound - right bound of object's content
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string ContentHandler::_retrieveStreamContent(merge_lib::Object * object, unsigned int leftBound, unsigned int rightBound)
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{
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return (object->hasStream()) ?
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_getStreamFromContent(object) :
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_getStreamFromReferencies(object, leftBound, rightBound);
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}
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//get stream from Array elements
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string ContentHandler::_getStreamFromReferencies(merge_lib::Object * objectWithArray, unsigned int leftBound, unsigned int rightBound)
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{
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std::string result;
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std::vector<Object *> referencies = objectWithArray->getSortedByPositionChildren(leftBound, rightBound);
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for(size_t i = 0; i < referencies.size(); ++i)
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{
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result.append(_retrieveStreamContent(referencies[i], 0, referencies[i]->getObjectContent().size()));
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}
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objectWithArray->forgetAboutChildren(leftBound,rightBound);
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return result;
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}
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//get stream from Object
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string ContentHandler::_getStreamFromContent(merge_lib::Object * objectWithStream)
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{
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Filter filter(objectWithStream);
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string decodedStream;
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filter.getDecodedStream(decodedStream);
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return decodedStream;
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}
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