BitShares/src/difficulty.cpp at master · Xenland/BitShares · GitHub

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#include <bts/difficulty.hpp>

#include <fc/exception/exception.hpp>

#include <string.h>

namespace bts

{

const fc::bigint& max224()

{

static fc::bigint m = [](){

char data[224/8+1];

memset( data, 0xff, sizeof(data) );

data[0] = 0;

return fc::bigint(data,sizeof(data));

}();

return m;

}

uint64_t difficulty( const fc::sha224& hash_value )

{

if( hash_value == fc::sha224() ) return uint64_t(-1); // div by 0

auto dif = max224() / fc::bigint( (char*)&hash_value, sizeof(hash_value) );

// TODO... restore this dif >>= 24;

int64_t tmp = dif.to_int64();

// possible if hash_value starts with 1

if( tmp < 0 ) tmp = 0;

return tmp;

}

} // bts