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authorjtimon <jtimon@monetize.io>2014-07-05 12:05:33 +0200
committerjtimon <jtimon@monetize.io>2014-08-23 13:21:51 +0200
commitb343c1a1e34f851e70649ad1f49855a7d878f9ef (patch)
treeb7c15e98c8a631420c186dd0acec51af4a02a061 /src/pow.cpp
parentc2c02f3fa99385f5a5be722fda6f71522c93bdaa (diff)
Move CBlockIndex::GetBlockWork() to pow::GetProofIncrement(nBits)
Diffstat (limited to 'src/pow.cpp')
-rw-r--r--src/pow.cpp15
1 files changed, 15 insertions, 0 deletions
diff --git a/src/pow.cpp b/src/pow.cpp
index a99c582d7d..d76928bda2 100644
--- a/src/pow.cpp
+++ b/src/pow.cpp
@@ -127,3 +127,18 @@ void UpdateTime(CBlockHeader* pblock, const CBlockIndex* pindexPrev)
if (Params().AllowMinDifficultyBlocks())
pblock->nBits = GetNextWorkRequired(pindexPrev, pblock);
}
+
+uint256 GetProofIncrement(unsigned int nBits)
+{
+ uint256 bnTarget;
+ bool fNegative;
+ bool fOverflow;
+ bnTarget.SetCompact(nBits, &fNegative, &fOverflow);
+ if (fNegative || fOverflow || bnTarget == 0)
+ return 0;
+ // We need to compute 2**256 / (bnTarget+1), but we can't represent 2**256
+ // as it's too large for a uint256. However, as 2**256 is at least as large
+ // as bnTarget+1, it is equal to ((2**256 - bnTarget - 1) / (bnTarget+1)) + 1,
+ // or ~bnTarget / (nTarget+1) + 1.
+ return (~bnTarget / (bnTarget + 1)) + 1;
+}