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OpenBoard/thirdparty/mera/pdf-merger/ContentHandler.cpp

74 lines
2.6 KiB

#include "ContentHandler.h"
#include "Filter.h"
#include "FlateDecode.h"
#include <iostream>
#include <string>
#include <string.h>
using namespace merge_lib;
using namespace std;
//concatenate stream of all objects which contain Content of Page
void ContentHandler::_processObjectContent(unsigned int startOfPageElement)
{
unsigned int endOfPage = _findEndOfElementContent(startOfPageElement);
_concatenatedStream = _retrieveStreamContent(_page, startOfPageElement, endOfPage);
FlateDecode flate;
flate.encode(_concatenatedStream);
}
//write concatenated stream to Page object
void ContentHandler::_changeObjectContent(unsigned int startOfPageElement)
{
unsigned int endOfPage = _findEndOfElementContent(startOfPageElement);
_page->forgetAboutChildren(startOfPageElement, endOfPage);
_page->eraseContent(startOfPageElement, endOfPage - startOfPageElement);
unsigned int endOfObjectDescription = _pageContent.rfind(">>");
const char * length = "/Filter /FlateDecode\n/Length ";
unsigned int sizeOfLength = strlen(length);
_page->insertToContent(endOfObjectDescription, length, sizeOfLength);
_page->insertToContent(endOfObjectDescription + sizeOfLength, Utils::uIntToStr(_concatenatedStream.size()).c_str());
_page->appendContent("\nstream\n");
_page->appendContent(_concatenatedStream);
_page->appendContent("endstream\n");
_page->forgetStreamInFile();
}
//get content of stream
// object - object with stream
//leftBound - left bound of object's content
//rightBound - right bound of object's content
string ContentHandler::_retrieveStreamContent(merge_lib::Object * object, unsigned int leftBound, unsigned int rightBound)
{
return (object->hasStream()) ?
_getStreamFromContent(object) :
_getStreamFromReferencies(object, leftBound, rightBound);
}
//get stream from Array elements
string ContentHandler::_getStreamFromReferencies(merge_lib::Object * objectWithArray, unsigned int leftBound, unsigned int rightBound)
{
std::string result;
std::vector<Object *> referencies = objectWithArray->getSortedByPositionChildren(leftBound, rightBound);
for(size_t i = 0; i < referencies.size(); ++i)
{
result.append(_retrieveStreamContent(referencies[i], 0, referencies[i]->getObjectContent().size()));
}
objectWithArray->forgetAboutChildren(leftBound,rightBound);
return result;
}
//get stream from Object
string ContentHandler::_getStreamFromContent(merge_lib::Object * objectWithStream)
{
Filter filter(objectWithStream);
string decodedStream;
filter.getDecodedStream(decodedStream);
return decodedStream;
}