PrefLib/chart/entropychart.cpp at master · PREF/PrefLib · GitHub

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#include "entropychart.h"

namespace PrefLib {

namespace Chart {

const uint64_t EntropyChart::NUM_POINTS = 2048ul;

const uint64_t EntropyChart::MIN_BLOCK_SIZE = 32ul;

EntropyChart::EntropyChart()

{

}

EntropyChart::~EntropyChart()

{

}

const EntropyChart::EntropyPoints &EntropyChart::points() const

{

return this->_points;

}

uint64_t EntropyChart::calculateBlockSize(uint64_t len)

{

if(len < EntropyChart::MIN_BLOCK_SIZE)

return 0;

uint64_t blocksize = 0, numpoints = EntropyChart::NUM_POINTS, size = len / numpoints;

while(size < EntropyChart::MIN_BLOCK_SIZE)

{

numpoints /= 2u;

size = len / numpoints;

}

for(uint64_t i = 0; blocksize < size; i++)

{

uint64_t bs = (1u << i);

if(bs > size)

break;

blocksize = bs;

}

this->_points.clear();

this->_points.reserve(numpoints);

return blocksize;

}

void EntropyChart::elaborate(IO::DataBuffer *databuffer, uint64_t startoffset, uint64_t endoffset, volatile bool *cancontinue)

{

uint64_t len = endoffset - startoffset, blocksize = this->calculateBlockSize(len);

if(!blocksize)

return;

for(uint64_t i = 0; i < len; i += blocksize)

{

if(cancontinue && !(*cancontinue))

break;

double e = Algorithm::entropy(databuffer, i, blocksize, cancontinue);

this->_points.push_back({ static_cast<double>(i), e });

}

} // namespace Chart

} // namespace PrefLib

PrefLib/chart/entropychart.cpp at master · PREF/PrefLib · GitHub

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