diff options
Diffstat (limited to 'src/pow.cpp')
| -rw-r--r-- | src/pow.cpp | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/src/pow.cpp b/src/pow.cpp index d76928bda2..1d2b743b48 100644 --- a/src/pow.cpp +++ b/src/pow.cpp @@ -94,29 +94,36 @@ bool CheckProofOfWork(uint256 hash, unsigned int nBits) } // -// minimum amount of work that could possibly be required nTime after -// minimum work required was nBase +// true if nBits is greater than the minimum amount of work that could +// possibly be required deltaTime after minimum work required was nBase // -unsigned int ComputeMinWork(unsigned int nBase, int64_t nTime) +bool CheckMinWork(unsigned int nBits, unsigned int nBase, int64_t deltaTime) { + bool fOverflow = false; + uint256 bnNewBlock; + bnNewBlock.SetCompact(nBits, NULL, &fOverflow); + if (fOverflow) + return false; + const uint256 &bnLimit = Params().ProofOfWorkLimit(); // Testnet has min-difficulty blocks // after Params().TargetSpacing()*2 time between blocks: - if (Params().AllowMinDifficultyBlocks() && nTime > Params().TargetSpacing()*2) - return bnLimit.GetCompact(); + if (Params().AllowMinDifficultyBlocks() && deltaTime > Params().TargetSpacing()*2) + return bnNewBlock <= bnLimit; uint256 bnResult; bnResult.SetCompact(nBase); - while (nTime > 0 && bnResult < bnLimit) + while (deltaTime > 0 && bnResult < bnLimit) { // Maximum 400% adjustment... bnResult *= 4; // ... in best-case exactly 4-times-normal target time - nTime -= Params().TargetTimespan()*4; + deltaTime -= Params().TargetTimespan()*4; } if (bnResult > bnLimit) bnResult = bnLimit; - return bnResult.GetCompact(); + + return bnNewBlock <= bnResult; } void UpdateTime(CBlockHeader* pblock, const CBlockIndex* pindexPrev) |