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| author | Wladimir J. van der Laan <laanwj@gmail.com> | 2014-05-09 16:57:06 +0200 |
|---|---|---|
| committer | Wladimir J. van der Laan <laanwj@gmail.com> | 2014-05-09 17:03:51 +0200 |
| commit | 8bcfccbc2de25e3b40d1c222d7c5d9991345a0aa (patch) | |
| tree | ec29908109f159efce4c7ccb6bba68125b1d04e8 /src/main.h | |
| parent | 82564e21e79092a7e28aa5d31d8fdbdb3fd970ca (diff) | |
| parent | 397668ea63e148a92f68e9fae578595585616770 (diff) | |
Merge pull request #4076
397668e Deduplicate uint* comparison operator logic (Pieter Wuille)
df9eb5e Move {Get,Set}Compact from bignum to uint256 (Pieter Wuille)
a703150 Add multiplication and division to uint160/uint256 (Pieter Wuille)
4d480c8 Exception instead of assigning 0 in case of wrong vector length (Pieter Wuille)
eb2cbd7 Deduplicate shared code between uint160 and uint256 (Pieter Wuille)
Diffstat (limited to 'src/main.h')
| -rw-r--r-- | src/main.h | 17 |
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 |