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Rounding fix.

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This commit is contained in:
JoelKatz
2012-04-10 17:00:40 -07:00
parent e61ddb980e
commit 48fe991cdb
1 changed files with 8 additions and 8 deletions
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14
src/Amount.cpp
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@@ -235,18 +235,18 @@ STAmount operator*(const STAmount &v1, const STAmount &v2)
{
if( (v1.value == 0) || (v2.value == 0) ) return STAmount();
// Compute (numerator * denominator) / 10^15
// Compute (numerator * denominator) / 10^16
CBigNum v;
if( (BN_add_word(&v, v1.value) != 1) ||
(BN_mul_word(&v, v2.value) != 1) ||
(BN_div_word(&v, 1000000000000000ull) == ((BN_ULONG)-1)) )
if( (BN_add_word(&v, v1.value + 1) != 1) ||
(BN_mul_word(&v, v2.value + 1) != 1) ||
(BN_div_word(&v, 10000000000000000ull) == ((BN_ULONG)-1)) )
{
throw std::runtime_error("internal bn error");
}
// 10^15 <= product <= 10^17
// 10^16 <= product <= 10^18
assert(BN_num_bytes(&v)<=60);
return STAmount(v.getulong(), v1.offset + v2.offset + 15);
return STAmount(v.getulong(), v1.offset + v2.offset + 16);
}
STAmount getRate(const STAmount& offerOut, const STAmount& offerIn)
@@ -295,6 +295,6 @@ STAmount getNeeded(const STAmount& offerOut, const STAmount& offerIn, const STAm
{ // Someone wants to get (needed) out of the offer, how much should they pay in?
if(offerOut.isZero()) return STAmount();
if(needed >= offerOut) return needed;
STAmount ret = needed * (offerIn / offerOut);
STAmount ret = (needed * offerIn) / offerOut;
return (ret > offerIn) ? offerIn : ret;
}