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feat(big): add Compare

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fallenoak 2023-01-31 22:34:05 -06:00
parent aad7f751dd
commit e9d3284c70
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3 changed files with 94 additions and 0 deletions
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12
storm/big/Ops.cpp
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@ -22,6 +22,18 @@ void Add(BigBuffer& a, const BigBuffer& b, const BigBuffer& c) {
a.SetCount(i);
}
int32_t Compare(const BigBuffer& a, const BigBuffer& b) {
int32_t result = 0;
for (int32_t i = 0; a.IsUsed(i) || b.IsUsed(i); i++) {
if (a[i] != b[i]) {
result = b[i] < a[i] ? 1 : -1;
}
}
return result;
}
uint32_t ExtractLowPart(uint64_t& value) {
auto low = static_cast<uint32_t>(value);
value >>= 32;

2
storm/big/Ops.hpp
View file

@ -9,6 +9,8 @@ void Add(BigBuffer& a, const BigBuffer& b, uint32_t c);
void Add(BigBuffer& a, const BigBuffer& b, const BigBuffer& c);
int32_t Compare(const BigBuffer& a, const BigBuffer& b);
uint32_t ExtractLowPart(uint64_t& value);
uint32_t ExtractLowPartSx(uint64_t& value);

80
test/Big.cpp
View file

@ -68,6 +68,86 @@ TEST_CASE("Add", "[big]") {
}
}
TEST_CASE("Compare", "[big]") {
SECTION("compares 0 and 1") {
BigData* a;
SBigNew(&a);
SBigFromUnsigned(a, 0);
BigData* b;
SBigNew(&b);
SBigFromUnsigned(b, 1);
CHECK(Compare(a->Primary(), b->Primary()) == -1);
SBigDel(a);
SBigDel(b);
}
SECTION("compares 1 and 1") {
BigData* a;
SBigNew(&a);
SBigFromUnsigned(a, 1);
BigData* b;
SBigNew(&b);
SBigFromUnsigned(b, 1);
CHECK(Compare(a->Primary(), b->Primary()) == 0);
SBigDel(a);
SBigDel(b);
}
SECTION("compares 10 and 1") {
BigData* a;
SBigNew(&a);
SBigFromUnsigned(a, 10);
BigData* b;
SBigNew(&b);
SBigFromUnsigned(b, 1);
CHECK(Compare(a->Primary(), b->Primary()) == 1);
SBigDel(a);
SBigDel(b);
}
SECTION("compares 0x1111111111111111 and 0x22222222") {
BigData* a;
SBigNew(&a);
uint64_t data = 0x1111111111111111;
SBigFromBinary(a, reinterpret_cast<uint8_t*>(&data), sizeof(data));
BigData* b;
SBigNew(&b);
SBigFromUnsigned(b, 0x22222222);
CHECK(Compare(a->Primary(), b->Primary()) == 1);
SBigDel(a);
SBigDel(b);
}
SECTION("compares 0x11111111 and 0x2222222222222222") {
BigData* a;
SBigNew(&a);
SBigFromUnsigned(a, 0x11111111);
BigData* b;
SBigNew(&b);
uint64_t data = 0x2222222222222222;
SBigFromBinary(b, reinterpret_cast<uint8_t*>(&data), sizeof(data));
CHECK(Compare(a->Primary(), b->Primary()) == -1);
SBigDel(a);
SBigDel(b);
}
}
TEST_CASE("ExtractLowPart", "[big]") {
SECTION("extracts low part of 0") {
uint64_t value = 0;