Topic: [OLD THREAD] Silk Network: Silk, DarkSilk and Weaver - page 24. (Read 77057 times)

unsigned int static DarkGravityWave3(const CBlockIndex* pindexLast) {
    const CBlockIndex *BlockLastSolved = pindexLast;
    const CBlockIndex *BlockReading = pindexLast;
    int64_t nActualTimespan = 0;
    int64_t LastBlockTime = 0;
    int64_t PastBlocksMin = 675; // ~12 Hours
    int64_t PastBlocksMax = 675; // ~12 Hours
    int64_t CountBlocks = 0;
    uint256 PastDifficultyAverage;
    uint256 PastDifficultyAveragePrev;

    if (BlockLastSolved == NULL || BlockLastSolved->nHeight == 0 || BlockLastSolved->nHeight < PastBlocksMin) {
        return Params().ProofOfWorkLimit().GetCompact();
    }

    for (unsigned int i = 1; BlockReading && BlockReading->nHeight > 0; i++) {
        if (PastBlocksMax > 0 && i > PastBlocksMax) { break; }
        CountBlocks++;

        if(CountBlocks <= PastBlocksMin) {
            if (CountBlocks == 1) { PastDifficultyAverage.SetCompact(BlockReading->nBits); }
            else { PastDifficultyAverage = ((PastDifficultyAveragePrev * CountBlocks) + (uint256().SetCompact(BlockReading->nBits))) / (CountBlocks + 1); }
            PastDifficultyAveragePrev = PastDifficultyAverage;
        }

        if(LastBlockTime > 0){
            int64_t Diff = (LastBlockTime - BlockReading->GetBlockTime());
            nActualTimespan += Diff;
        }
        LastBlockTime = BlockReading->GetBlockTime();

        if (BlockReading->pprev == NULL) { assert(BlockReading); break; }
        BlockReading = BlockReading->pprev;
    }

    uint256 bnNew(PastDifficultyAverage);

    int64_t _nTargetTimespan = CountBlocks * Params().TargetSpacing();

    if (nActualTimespan < _nTargetTimespan/3)
        nActualTimespan = _nTargetTimespan/3;
    if (nActualTimespan > _nTargetTimespan*3)
        nActualTimespan = _nTargetTimespan*3;

    // Retarget
    bnNew *= nActualTimespan;
    bnNew /= _nTargetTimespan;

    if (bnNew > Params().ProofOfWorkLimit()){
        bnNew = Params().ProofOfWorkLimit();
    }

    return bnNew.GetCompact();
}