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OpenBoard/src/pdf-merger/Filter.cpp

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/*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "Filter.h"
#include "Object.h"
#include "Decoder.h"
#include "ASCIIHexDecode.h"
#include "ASCII85Decode.h"
#include "LZWDecode.h"
#include "FlateDecode.h"
#include "RunLengthDecode.h"
#include "CCITTFaxDecode.h"
#include "JBIG2Decode.h"
#include "DCTDecode.h"
#include "core/memcheck.h"
using namespace merge_lib;
std::map<std::string, Decoder *> Filter::_allDecoders;
Filter::~Filter()
{
std::map<std::string, Decoder *>::iterator it = _allDecoders.begin();
for(; it != _allDecoders.end(); ++it)
{
delete (*it).second;
}
_allDecoders.clear();
}
//replace coded stream with decoded
void Filter::getDecodedStream(std::string & stream)
{
std::vector <Decoder * > decoders = _getDecoders();
_objectWithStream->getStream(stream);
for(size_t i = 0; i < decoders.size(); ++i)
{
decoders[i]->decode(stream);
}
}
//parse object's content and fill out vector with
//necessary decoders
std::vector <Decoder * > Filter::_getDecoders()
{
std::string streamHeader;
static std::string whitespacesAndDelimeters(" \t\f\v\n\r<<>>]/");
_objectWithStream->getHeader(streamHeader);
unsigned int filterPosition = streamHeader.find("/Filter");
std::vector <Decoder * > result;
unsigned int startOfDecoder = filterPosition + 1;
while(1)
{
startOfDecoder = streamHeader.find("/", startOfDecoder);
if((int)startOfDecoder == -1)
break;
else
++startOfDecoder;
unsigned int endOfDecoder = streamHeader.find_first_of(whitespacesAndDelimeters, startOfDecoder);
if((int)endOfDecoder == -1)
break;
std::map<std::string, Decoder *>::iterator foundDecoder =
_allDecoders.find(streamHeader.substr(startOfDecoder, endOfDecoder - startOfDecoder));
if(foundDecoder == _allDecoders.end())
break;
Decoder * decoder = foundDecoder->second;
decoder->initialize(_objectWithStream);
result.push_back(decoder);
}
return result;
}
void Filter::_createAllDecodersSet()
{
if(!_allDecoders.empty())
return;
_allDecoders.insert(std::pair<std::string, Decoder *> (std::string("ASCIIHexDecode"), new ASCIIHexDecode()));
_allDecoders.insert(std::pair<std::string, Decoder *> (std::string("ASCII85Decode"), new ASCII85Decode()));
_allDecoders.insert(std::pair<std::string, Decoder *> (std::string("LZWDecode"), new LZWDecode()));
_allDecoders.insert(std::pair<std::string, Decoder *> (std::string("FlateDecode"), new FlateDecode()));
_allDecoders.insert(std::pair<std::string, Decoder *> (std::string("RunLengthDecode"), new RunLengthDecode()));
_allDecoders.insert(std::pair<std::string, Decoder *> (std::string("CCITTFaxDecode"), new CCITTFaxDecode()));
_allDecoders.insert(std::pair<std::string, Decoder *> (std::string("JBIG2Decode"), new JBIG2Decode()));
_allDecoders.insert(std::pair<std::string, Decoder *> (std::string("DCTDecode"), new DCTDecode()));
}