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feat(big): add SBigBitLen

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fallenoak 2023-02-01 22:54:33 -06:00
parent 5edf49dae7
commit 24c6a5134c
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3 changed files with 87 additions and 0 deletions
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17
storm/Big.cpp
View file

@ -7,6 +7,23 @@ void SBigAdd(BigData* a, BigData* b, BigData* c) {
Add(a->Primary(), b->Primary(), c->Primary());
}
void SBigBitLen(BigData* num, uint32_t* len) {
auto& buffer = num->Primary();
buffer.Trim();
auto index = buffer.Count() - 1;
auto high = buffer[index];
uint32_t bitIndex;
for (bitIndex = 31; bitIndex > 0; bitIndex--) {
if (((1 << bitIndex) & high)) {
break;
}
}
*len = (index * 32) + bitIndex + 1;
}
int32_t SBigCompare(BigData* a, BigData* b) {
return Compare(a->Primary(), b->Primary());
}

2
storm/Big.hpp
View file

@ -6,6 +6,8 @@
void SBigAdd(BigData* a, BigData* b, BigData* c);
void SBigBitLen(BigData* num, uint32_t* len);
int32_t SBigCompare(BigData* a, BigData* b);
void SBigDel(BigData* num);

68
test/Big.cpp
View file

@ -459,6 +459,74 @@ TEST_CASE("SBigAdd", "[big]") {
}
}
TEST_CASE("SBigBitLen", "[big]") {
SECTION("returns bit length of 1") {
BigData* num;
SBigNew(&num);
SBigFromUnsigned(num, 1);
uint32_t len;
SBigBitLen(num, &len);
CHECK(len == 1);
SBigDel(num);
}
SECTION("returns bit length of 5") {
BigData* num;
SBigNew(&num);
SBigFromUnsigned(num, 5);
uint32_t len;
SBigBitLen(num, &len);
CHECK(len == 3);
SBigDel(num);
}
SECTION("returns bit length of 0xFFFF") {
BigData* num;
SBigNew(&num);
SBigFromUnsigned(num, 0xFFFF);
uint32_t len;
SBigBitLen(num, &len);
CHECK(len == 16);
SBigDel(num);
}
SECTION("returns bit length of 0xFFFFFFFF") {
BigData* num;
SBigNew(&num);
SBigFromUnsigned(num, 0xFFFFFFFF);
uint32_t len;
SBigBitLen(num, &len);
CHECK(len == 32);
SBigDel(num);
}
SECTION("returns bit length of 0x22222222AAAAAAAA") {
BigData* num;
SBigNew(&num);
uint64_t num_ = 0x22222222AAAAAAAA;
SBigFromBinary(num, reinterpret_cast<uint8_t*>(&num_), sizeof(num_));
uint32_t len;
SBigBitLen(num, &len);
CHECK(len == 62);
SBigDel(num);
}
}
TEST_CASE("SBigCompare", "[big]") {
SECTION("compares 10 and 1") {
BigData* a;