entropy_stats.h

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#pragma once
 
#include <windows.h>
#include "entropy.h"
#include "stats.h"
 
namespace pesieve {
 
    class AreaEntropyStats : public AreaStats {
    public:
        AreaEntropyStats()
            : AreaStats(),
            entropy(0.0)
        {
        }
 
        // Copy constructor
        AreaEntropyStats(const AreaEntropyStats& p1)
        {
            area_size = p1.area_size;
            area_start = p1.area_start;
            entropy = p1.entropy;
        }
 
        void _appendVal(BYTE val)
        {
            histogram[val]++;
        }
 
        virtual void summarize()
        {
            entropy = stats::calcShannonEntropy(histogram, area_size);
        }
 
        double entropy;
 
    protected:
        const virtual void fieldsToJSON(std::stringstream& outs, size_t level)
        {
            OUT_PADDED(outs, level, "\"area_start\" : ");
            outs << "\"" << std::hex << area_start << "\"";
            outs << ",\n";
            OUT_PADDED(outs, level, "\"area_size\" : ");
            outs << "\"" << std::hex << area_size << "\"";
            outs << ",\n";
            OUT_PADDED(outs, level, "\"entropy\" : ");
            outs << std::dec << entropy;
        }
 
        std::map<BYTE, size_t> histogram;
        
        friend class AreaStatsCalculator;
 
    }; // AreaStats
 
};