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116 lines
3.9 KiB
116 lines
3.9 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 "Filter.h"
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#include "Object.h"
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#include "Decoder.h"
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#include "ASCIIHexDecode.h"
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#include "ASCII85Decode.h"
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#include "LZWDecode.h"
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#include "FlateDecode.h"
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#include "RunLengthDecode.h"
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#include "CCITTFaxDecode.h"
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#include "JBIG2Decode.h"
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#include "DCTDecode.h"
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#include "core/memcheck.h"
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using namespace merge_lib;
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std::map<std::string, Decoder *> Filter::_allDecoders;
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Filter::~Filter()
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{
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std::map<std::string, Decoder *>::iterator it = _allDecoders.begin();
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for(; it != _allDecoders.end(); ++it)
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{
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delete (*it).second;
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}
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_allDecoders.clear();
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}
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//replace coded stream with decoded
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void Filter::getDecodedStream(std::string & stream)
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{
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std::vector <Decoder * > decoders = _getDecoders();
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_objectWithStream->getStream(stream);
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for(size_t i = 0; i < decoders.size(); ++i)
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{
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decoders[i]->decode(stream);
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}
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}
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//parse object's content and fill out vector with
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//necessary decoders
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std::vector <Decoder * > Filter::_getDecoders()
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{
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std::string streamHeader;
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static std::string whitespacesAndDelimeters(" \t\f\v\n\r<<>>]/");
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_objectWithStream->getHeader(streamHeader);
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unsigned int filterPosition = streamHeader.find("/Filter");
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std::vector <Decoder * > result;
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unsigned int startOfDecoder = filterPosition + 1;
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while(1)
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{
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startOfDecoder = streamHeader.find("/", startOfDecoder);
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if((int)startOfDecoder == -1)
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break;
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else
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++startOfDecoder;
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unsigned int endOfDecoder = streamHeader.find_first_of(whitespacesAndDelimeters, startOfDecoder);
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if((int)endOfDecoder == -1)
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break;
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std::map<std::string, Decoder *>::iterator foundDecoder =
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_allDecoders.find(streamHeader.substr(startOfDecoder, endOfDecoder - startOfDecoder));
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if(foundDecoder == _allDecoders.end())
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break;
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Decoder * decoder = foundDecoder->second;
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decoder->initialize(_objectWithStream);
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result.push_back(decoder);
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}
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return result;
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}
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void Filter::_createAllDecodersSet()
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{
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if(!_allDecoders.empty())
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return;
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_allDecoders.insert(std::pair<std::string, Decoder *> (std::string("ASCIIHexDecode"), new ASCIIHexDecode()));
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_allDecoders.insert(std::pair<std::string, Decoder *> (std::string("ASCII85Decode"), new ASCII85Decode()));
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_allDecoders.insert(std::pair<std::string, Decoder *> (std::string("LZWDecode"), new LZWDecode()));
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_allDecoders.insert(std::pair<std::string, Decoder *> (std::string("FlateDecode"), new FlateDecode()));
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_allDecoders.insert(std::pair<std::string, Decoder *> (std::string("RunLengthDecode"), new RunLengthDecode()));
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_allDecoders.insert(std::pair<std::string, Decoder *> (std::string("CCITTFaxDecode"), new CCITTFaxDecode()));
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_allDecoders.insert(std::pair<std::string, Decoder *> (std::string("JBIG2Decode"), new JBIG2Decode()));
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_allDecoders.insert(std::pair<std::string, Decoder *> (std::string("DCTDecode"), new DCTDecode()));
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}
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