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Change native coin functions to use uint64_t instead of STAmount.

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This commit is contained in:
JoelKatz
2012-04-30 11:30:34 -07:00
parent 6c52f735d9
commit f05b88d459
1 changed files with 20 additions and 7 deletions
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23
src/Amount.cpp
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@@ -309,14 +309,27 @@ STAmount getNeeded(const STAmount& offerOut, const STAmount& offerIn, const STAm
return (ret > offerIn) ? offerIn : ret;
}
STAmount convertToDisplayAmount(const STAmount& internalAmount, const STAmount& totalNow, const STAmount& totalInit)
{ // Convert an internal ledger/account quantity of native currency to a display amount
return (internalAmount * totalInit) / totalNow;
static uint64_t muldiv(uint64_t a, uint64_t b, uint64_t c)
{ // computes (a*b)/c rounding up - supports values up to 10^18
if (c == 0) throw std::runtime_error("underflow");
if ((a == 0) || (b == 0)) return 0;
CBigNum v;
if ((BN_add_word(&v, a * 10 + 3) != 1) || (BN_mul_word(&v, b * 10 + 3) != 1) ||
(BN_div_word(&v, c) == ((BN_ULONG) - 1)) || (BN_div_word(&v, 100) == ((BN_ULONG) - 1)))
throw std::runtime_error("muldiv error");
return v.getulong();
}
STAmount convertToInternalAmount(const STAmount& displayAmount, const STAmount& totalNow, const STAmount& totalInit)
STAmount convertToDisplayAmount(uint64_t internalAmount, uint64_t totalNow, uint64_t totalInit)
{ // Convert an internal ledger/account quantity of native currency to a display amount
return muldiv(internalAmount, totalInit, totalNow);
}
STAmount convertToInternalAmount(uint64_t displayAmount, uint64_t totalNow, uint64_t totalInit)
{ // Convert a display/request currency amount to an internal amount
return (displayAmount * totalNow) / totalInit;
return muldiv(displayAmount, totalNow, totalInit);
}
void STAmount::unitTest()