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feat(big): add SBigMod

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fallenoak 2023-02-04 14:03:45 -06:00
parent 8845aa5a7f
commit a597e8f495
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3 changed files with 103 additions and 0 deletions
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9
storm/Big.cpp
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@ -40,6 +40,15 @@ void SBigFromUnsigned(BigData* num, uint32_t val) {
FromUnsigned(num->Primary(), val);
}
void SBigMod(BigData* a, BigData* b, BigData* c) {
uint32_t allocCount = 0;
auto& scratch = a->Stack().Alloc(&allocCount);
Div(scratch, a->Primary(), b->Primary(), c->Primary(), a->Stack());
a->Stack().Free(allocCount);
}
void SBigNew(BigData** num) {
auto m = SMemAlloc(sizeof(BigData), __FILE__, __LINE__, 0x0);
*num = new (m) BigData();

2
storm/Big.hpp
View file

@ -16,6 +16,8 @@ void SBigFromBinary(BigData* num, const void* data, uint32_t bytes);
void SBigFromUnsigned(BigData* num, uint32_t val);
void SBigMod(BigData* a, BigData* b, BigData* c);
void SBigMul(BigData* a, BigData* b, BigData* c);
void SBigNew(BigData** num);

92
test/Big.cpp
View file

@ -882,6 +882,98 @@ TEST_CASE("SBigFromUnsigned", "[big]") {
}
}
TEST_CASE("SBigMod", "[big]") {
SECTION("mods 7 by 4") {
BigData* a;
SBigNew(&a);
BigData* b;
SBigNew(&b);
SBigFromUnsigned(b, 7);
BigData* c;
SBigNew(&c);
SBigFromUnsigned(c, 4);
SBigMod(a, b, c);
a->Primary().Trim();
CHECK(a->Primary().Count() == 1);
CHECK(a->Primary()[0] == 3);
SBigDel(a);
SBigDel(b);
SBigDel(c);
}
SECTION("mods 7 by 4 then mods 9 by 5") {
BigData* a;
SBigNew(&a);
BigData* b1;
SBigNew(&b1);
SBigFromUnsigned(b1, 7);
BigData* c1;
SBigNew(&c1);
SBigFromUnsigned(c1, 4);
BigData* b2;
SBigNew(&b2);
SBigFromUnsigned(b2, 9);
BigData* c2;
SBigNew(&c2);
SBigFromUnsigned(c2, 5);
SBigMod(a, b1, c1);
a->Primary().Trim();
CHECK(a->Primary().Count() == 1);
CHECK(a->Primary()[0] == 3);
SBigMod(a, b2, c2);
a->Primary().Trim();
CHECK(a->Primary().Count() == 1);
CHECK(a->Primary()[0] == 4);
SBigDel(a);
SBigDel(b1);
SBigDel(c1);
SBigDel(b2);
SBigDel(c2);
}
SECTION("mods 0x9999444488885555 by 0xFFFFFFFF") {
BigData* a;
SBigNew(&a);
BigData* b;
SBigNew(&b);
uint64_t b_ = 0x9999444488885555;
SBigFromBinary(b, reinterpret_cast<uint8_t*>(&b_), sizeof(b_));
BigData* c;
SBigNew(&c);
SBigFromUnsigned(c, 0xFFFFFFFF);
SBigMod(a, b, c);
a->Primary().Trim();
CHECK(a->Primary().Count() == 1);
CHECK(a->Primary()[0] == 0x2221999A);
SBigDel(a);
SBigDel(b);
SBigDel(c);
}
}
TEST_CASE("SBigMul", "[big]") {
SECTION("multiplies 0 and 1") {
BigData* a;