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Fix a native*native bug. Add a test to make sure integer multiplications give exact results.

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This commit is contained in:
JoelKatz
2012-12-12 21:50:07 -08:00
parent 7724b18aeb
commit d7fcb5c7ba
1 changed files with 21 additions and 7 deletions
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28
src/cpp/ripple/Amount.cpp
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@@ -920,7 +920,7 @@ STAmount STAmount::multiply(const STAmount& v1, const STAmount& v2, const uint16
if (v1.isZero() || v2.isZero())
return STAmount(uCurrencyID, uIssuerID);
if (v1.mIsNative && v2.mIsNative)
if (v1.mIsNative && v2.mIsNative && uCurrencyID.isZero())
{
uint64 minV = (v1.getSNValue() < v2.getSNValue()) ? v1.getSNValue() : v2.getSNValue();
uint64 maxV = (v1.getSNValue() < v2.getSNValue()) ? v2.getSNValue() : v1.getSNValue();
@@ -1430,6 +1430,22 @@ static void roundTest(int n, int d, int m)
BOOST_FAIL("STAmount rounding failure");
}
static void mulTest(int a, int b)
{
STAmount aa(CURRENCY_ONE, ACCOUNT_ONE, a);
STAmount bb(CURRENCY_ONE, ACCOUNT_ONE, b);
STAmount prod1(STAmount::multiply(aa, bb, CURRENCY_ONE, ACCOUNT_ONE));
if (prod1.isNative())
BOOST_FAIL("product is native");
STAmount prod2(CURRENCY_ONE, ACCOUNT_ONE, a * b);
if (prod1 == prod2)
return;
Log(lsWARNING) << "(" << aa.getFullText() << " * " << bb.getFullText() << ") = " << prod1.getFullText()
<< " not " << prod2.getFullText();
BOOST_FAIL("Multiplication result is not exact");
}
BOOST_AUTO_TEST_CASE( CurrencyMulDivTests )
{
// Test currency multiplication and division operations such as
@@ -1452,12 +1468,10 @@ BOOST_AUTO_TEST_CASE( CurrencyMulDivTests )
if (STAmount::getRate(STAmount(10), STAmount(CURRENCY_ONE, ACCOUNT_ONE, 1)) != (((100ul-16)<<(64-8))|1000000000000000ul))
BOOST_FAIL("STAmount getRate fail");
roundTest(1, 3, 3);
roundTest(2, 3, 9);
roundTest(1, 7, 21);
roundTest(1, 2, 4);
roundTest(3, 9, 18);
roundTest(7, 11, 44);
roundTest(1, 3, 3); roundTest(2, 3, 9); roundTest(1, 7, 21); roundTest(1, 2, 4);
roundTest(3, 9, 18); roundTest(7, 11, 44);
mulTest(100, 1000); mulTest(1, 2); mulTest(32, 15); mulTest(981, 4012);
}
BOOST_AUTO_TEST_SUITE_END()