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-rw-r--r--src/main.h17
1 files changed, 11 insertions, 6 deletions
diff --git a/src/main.h b/src/main.h
index 3d3773138d..f47c9ee825 100644
--- a/src/main.h
+++ b/src/main.h
@@ -10,7 +10,6 @@
#include "bitcoin-config.h"
#endif
-#include "bignum.h"
#include "chainparams.h"
#include "coins.h"
#include "core.h"
@@ -814,13 +813,19 @@ public:
return (int64_t)nTime;
}
- CBigNum GetBlockWork() const
+ uint256 GetBlockWork() const
{
- CBigNum bnTarget;
- bnTarget.SetCompact(nBits);
- if (bnTarget <= 0)
+ uint256 bnTarget;
+ bool fNegative;
+ bool fOverflow;
+ bnTarget.SetCompact(nBits, &fNegative, &fOverflow);
+ if (fNegative || fOverflow || bnTarget == 0)
return 0;
- return (CBigNum(1)<<256) / (bnTarget+1);
+ // 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;
}
bool CheckIndex() const