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-rw-r--r--src/chain.cpp32
-rw-r--r--src/chain.h4
-rw-r--r--src/pow.cpp32
-rw-r--r--src/pow.h5
4 files changed, 36 insertions, 37 deletions
diff --git a/src/chain.cpp b/src/chain.cpp
index 3450ed6c3f..32f6480f84 100644
--- a/src/chain.cpp
+++ b/src/chain.cpp
@@ -110,3 +110,35 @@ void CBlockIndex::BuildSkip()
if (pprev)
pskip = pprev->GetAncestor(GetSkipHeight(nHeight));
}
+
+arith_uint256 GetBlockProof(const CBlockIndex& block)
+{
+ arith_uint256 bnTarget;
+ bool fNegative;
+ bool fOverflow;
+ bnTarget.SetCompact(block.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 arith_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;
+}
+
+int64_t GetBlockProofEquivalentTime(const CBlockIndex& to, const CBlockIndex& from, const CBlockIndex& tip, const Consensus::Params& params)
+{
+ arith_uint256 r;
+ int sign = 1;
+ if (to.nChainWork > from.nChainWork) {
+ r = to.nChainWork - from.nChainWork;
+ } else {
+ r = from.nChainWork - to.nChainWork;
+ sign = -1;
+ }
+ r = r * arith_uint256(params.nPowTargetSpacing) / GetBlockProof(tip);
+ if (r.bits() > 63) {
+ return sign * std::numeric_limits<int64_t>::max();
+ }
+ return sign * r.GetLow64();
+}
diff --git a/src/chain.h b/src/chain.h
index 01be2d6e5c..0c152a5ea9 100644
--- a/src/chain.h
+++ b/src/chain.h
@@ -282,6 +282,10 @@ public:
const CBlockIndex* GetAncestor(int height) const;
};
+arith_uint256 GetBlockProof(const CBlockIndex& block);
+/** Return the time it would take to redo the work difference between from and to, assuming the current hashrate corresponds to the difficulty at tip, in seconds. */
+int64_t GetBlockProofEquivalentTime(const CBlockIndex& to, const CBlockIndex& from, const CBlockIndex& tip, const Consensus::Params&);
+
/** Used to marshal pointers into hashes for db storage. */
class CDiskBlockIndex : public CBlockIndex
{
diff --git a/src/pow.cpp b/src/pow.cpp
index 5ace3fbc9b..dc58e21e12 100644
--- a/src/pow.cpp
+++ b/src/pow.cpp
@@ -102,35 +102,3 @@ bool CheckProofOfWork(uint256 hash, unsigned int nBits, const Consensus::Params&
return true;
}
-
-arith_uint256 GetBlockProof(const CBlockIndex& block)
-{
- arith_uint256 bnTarget;
- bool fNegative;
- bool fOverflow;
- bnTarget.SetCompact(block.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 arith_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;
-}
-
-int64_t GetBlockProofEquivalentTime(const CBlockIndex& to, const CBlockIndex& from, const CBlockIndex& tip, const Consensus::Params& params)
-{
- arith_uint256 r;
- int sign = 1;
- if (to.nChainWork > from.nChainWork) {
- r = to.nChainWork - from.nChainWork;
- } else {
- r = from.nChainWork - to.nChainWork;
- sign = -1;
- }
- r = r * arith_uint256(params.nPowTargetSpacing) / GetBlockProof(tip);
- if (r.bits() > 63) {
- return sign * std::numeric_limits<int64_t>::max();
- }
- return sign * r.GetLow64();
-}
diff --git a/src/pow.h b/src/pow.h
index e864a474cc..a80a335175 100644
--- a/src/pow.h
+++ b/src/pow.h
@@ -13,16 +13,11 @@
class CBlockHeader;
class CBlockIndex;
class uint256;
-class arith_uint256;
unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock, const Consensus::Params&);
unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nFirstBlockTime, const Consensus::Params&);
/** Check whether a block hash satisfies the proof-of-work requirement specified by nBits */
bool CheckProofOfWork(uint256 hash, unsigned int nBits, const Consensus::Params&);
-arith_uint256 GetBlockProof(const CBlockIndex& block);
-
-/** Return the time it would take to redo the work difference between from and to, assuming the current hashrate corresponds to the difficulty at tip, in seconds. */
-int64_t GetBlockProofEquivalentTime(const CBlockIndex& to, const CBlockIndex& from, const CBlockIndex& tip, const Consensus::Params&);
#endif // BITCOIN_POW_H