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feat(big): add SBigSub

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fallenoak 2023-02-01 21:29:16 -06:00
parent 6e62f0a604
commit 5d875631a6
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GPG key ID: 7628F8E61AEA070D
5 changed files with 146 additions and 0 deletions
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125
test/Big.cpp
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@ -583,6 +583,31 @@ TEST_CASE("SBigMul", "[big]") {
}
}
TEST_CASE("SBigSub", "[big]") {
SECTION("subtracts 1 from 2") {
BigData* a;
SBigNew(&a);
BigData* b;
SBigNew(&b);
SBigFromUnsigned(b, 2);
BigData* c;
SBigNew(&c);
SBigFromUnsigned(c, 1);
SBigSub(a, b, c);
a->Primary().Trim();
CHECK(a->Primary().Count() == 1);
CHECK(a->Primary()[0] == 1);
SBigDel(a);
SBigDel(b);
}
}
TEST_CASE("SBigToBinaryBuffer", "[big]") {
SECTION("returns expected buffer for bigdata representing 0") {
BigData* num;
@ -663,3 +688,103 @@ TEST_CASE("SetZero", "[big]") {
SBigDel(num);
}
}
TEST_CASE("Sub", "[big]") {
SECTION("subtracts 0 from 1") {
BigData* a;
SBigNew(&a);
BigData* b;
SBigNew(&b);
SBigFromUnsigned(b, 1);
BigData* c;
SBigNew(&c);
SBigFromUnsigned(c, 0);
Sub(a->Primary(), b->Primary(), c->Primary());
a->Primary().Trim();
CHECK(a->Primary().Count() == 1);
CHECK(a->Primary()[0] == 1);
SBigDel(a);
SBigDel(b);
}
SECTION("subtracts 1 from 2") {
BigData* a;
SBigNew(&a);
BigData* b;
SBigNew(&b);
SBigFromUnsigned(b, 2);
BigData* c;
SBigNew(&c);
SBigFromUnsigned(c, 1);
Sub(a->Primary(), b->Primary(), c->Primary());
a->Primary().Trim();
CHECK(a->Primary().Count() == 1);
CHECK(a->Primary()[0] == 1);
SBigDel(a);
SBigDel(b);
}
SECTION("subtracts 0x1111111111111111 from 0x9999999999999999") {
BigData* a;
SBigNew(&a);
BigData* b;
SBigNew(&b);
uint64_t b_ = 0x9999999999999999;
SBigFromBinary(b, reinterpret_cast<uint8_t*>(&b_), sizeof(b_));
BigData* c;
SBigNew(&c);
uint64_t c_ = 0x1111111111111111;
SBigFromBinary(c, reinterpret_cast<uint8_t*>(&c_), sizeof(c_));
Sub(a->Primary(), b->Primary(), c->Primary());
a->Primary().Trim();
CHECK(a->Primary().Count() == 2);
CHECK(a->Primary()[0] == 0x88888888);
CHECK(a->Primary()[1] == 0x88888888);
SBigDel(a);
SBigDel(b);
}
SECTION("subtracts 0x123456789ABCDEF0 from 0xFEDCBA9876543210") {
BigData* a;
SBigNew(&a);
BigData* b;
SBigNew(&b);
uint64_t b_ = 0xFEDCBA9876543210;
SBigFromBinary(b, reinterpret_cast<uint8_t*>(&b_), sizeof(b_));
BigData* c;
SBigNew(&c);
uint64_t c_ = 0x123456789ABCDEF0;
SBigFromBinary(c, reinterpret_cast<uint8_t*>(&c_), sizeof(c_));
Sub(a->Primary(), b->Primary(), c->Primary());
a->Primary().Trim();
CHECK(a->Primary().Count() == 2);
CHECK(a->Primary()[0] == 0xDB975320);
CHECK(a->Primary()[1] == 0xECA8641F);
SBigDel(a);
SBigDel(b);
}
}