Bits<256> Block::getSeedHash(Epoch epochs)
{
if(Block::epochToSeedMap.size() <= 0 || Block::seedToEpochMap.size() <= 0)
{
createSeedMapCache();
}
if(epochs < 2048)
{
return Block::epochToSeedMap[epochs];
}
else
{
Bits<256> seedHash = Block::epochToSeedMap[2047];
for (uint64_t i = 2047; i < epochs; ++i)
{
SHA3_256(seedHash.ptr(), seedHash.ptr(), 32);
}
return seedHash;
}
}
void Block::createSeedMapCache()
{
uint64_t seedMapFileSize = 2048*(256/8);
uint8_t seedMap[seedMapFileSize];
std::ifstream inputFile( "seedmap", std::ios::binary );
if(inputFile.fail())
{
Bits<256> seedHash;
for(size_t i=0 ; i<2048 ; i++)
{
uint8_t* ptr = &seedMap[i*(256/8)];
memcpy(ptr,seedHash.ptr(),32);
Block::epochToSeedMap[i] = Bits<256>(seedHash);
Block::seedToEpochMap[seedHash] = i;
SHA3_256(seedHash.ptr(), seedHash.ptr(), 32);
}
std::ofstream outputFile( "seedmap", std::ofstream::out );
outputFile.write((char*)seedMap, seedMapFileSize);
outputFile.flush();
outputFile.close();
}
else
{
inputFile.read((char*)seedMap,seedMapFileSize);
inputFile.close();
for(size_t i=0 ; i<2048 ; i++)
{
uint8_t* ptr = &seedMap[i*(256/8)];
Block::epochToSeedMap[i] = Bits<256>(ptr);
Block::seedToEpochMap[Bits<256>(ptr)] = i;
}
}
}
