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feat(big): add SBigFromBinary

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fallenoak 2023-01-29 20:37:09 -06:00 • committed by GitHub
parent 902ddcf7d8
commit 6c83070380
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7 changed files with 66 additions and 0 deletions
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4
storm/Big.cpp
View file

@ -7,6 +7,10 @@ void SBigDel(BigData* num) {
delete num;
}
void SBigFromBinary(BigData* num, const void* data, uint32_t bytes) {
FromBinary(num->Primary(), data, bytes);
}
void SBigFromUnsigned(BigData* num, uint32_t val) {
FromUnsigned(num->Primary(), val);
}

2
storm/Big.hpp
View file

@ -6,6 +6,8 @@
void SBigDel(BigData* num);
void SBigFromBinary(BigData* num, const void* data, uint32_t bytes);
void SBigFromUnsigned(BigData* num, uint32_t val);
void SBigNew(BigData** num);

4
storm/big/BigBuffer.cpp
View file

@ -13,6 +13,10 @@ uint32_t BigBuffer::operator[](uint32_t index) const {
return 0;
}
void BigBuffer::Clear() {
this->m_data.SetCount(this->m_offset);
}
uint32_t BigBuffer::Count() const {
return this->m_data.Count() - this->m_offset;
}

1
storm/big/BigBuffer.hpp
View file

@ -13,6 +13,7 @@ class BigBuffer {
// Member functions
uint32_t& operator[](uint32_t index);
uint32_t operator[](uint32_t index) const;
void Clear();
uint32_t Count() const;
void GrowToFit(uint32_t index);
int32_t IsUsed(uint32_t index) const;

10
storm/big/Ops.cpp
View file

@ -19,6 +19,16 @@ uint32_t ExtractLowPartSx(uint64_t& value) {
return low;
}
void FromBinary(BigBuffer& buffer, const void* data, uint32_t bytes) {
buffer.Clear();
for (uint32_t i = 0; i < bytes; i++) {
auto byte = static_cast<const uint8_t*>(data)[i];
auto v7 = (i & 3) ? buffer[i / 4] : 0;
buffer[i / 4] = v7 + (byte << (8 * (i & 3)));
}
}
void FromUnsigned(BigBuffer& buffer, uint32_t value) {
buffer[0] = value;
buffer.SetCount(1);

2
storm/big/Ops.hpp
View file

@ -8,6 +8,8 @@ uint32_t ExtractLowPart(uint64_t& value);
uint32_t ExtractLowPartSx(uint64_t& value);
void FromBinary(BigBuffer& buffer, const void* value, uint32_t bytes);
void FromUnsigned(BigBuffer& buffer, uint32_t value);
uint64_t MakeLarge(uint32_t low, uint32_t high);

43
test/Big.cpp
View file

@ -68,6 +68,33 @@ TEST_CASE("MakeLarge", "[big]") {
}
}
TEST_CASE("SBigFromBinary", "[big]") {
SECTION("creates bigdata from 0") {
BigData* num;
SBigNew(&num);
uint32_t data = 0;
SBigFromBinary(num, reinterpret_cast<uint8_t*>(&data), sizeof(data));
CHECK(num->Primary().Count() == 1);
CHECK(num->Primary()[0] == 0);
SBigDel(num);
}
SECTION("creates bigdata from 0x123456789ABCDEF0") {
BigData* num;
SBigNew(&num);
uint64_t data = 0x123456789ABCDEF0;
SBigFromBinary(num, reinterpret_cast<uint8_t*>(&data), sizeof(data));
CHECK(num->Primary().Count() == 2);
CHECK(num->Primary()[0] == 0x9ABCDEF0);
CHECK(num->Primary()[1] == 0x12345678);
SBigDel(num);
}
}
TEST_CASE("SBigFromUnsigned", "[big]") {
SECTION("creates bigdata from 0") {
BigData* num;
@ -121,4 +148,20 @@ TEST_CASE("SBigToBinaryBuffer", "[big]") {
SBigDel(num);
}
SECTION("returns expected buffer for bigdata representing 0x123456789ABCDEF0") {
BigData* num;
SBigNew(&num);
uint64_t data = 0x123456789ABCDEF0;
SBigFromBinary(num, reinterpret_cast<uint8_t*>(&data), sizeof(data));
uint8_t buffer[8];
uint32_t bytes;
SBigToBinaryBuffer(num, buffer, sizeof(buffer), &bytes);
CHECK(bytes == 8);
CHECK(*reinterpret_cast<uint64_t*>(buffer) == 0x123456789ABCDEF0);
SBigDel(num);
}
}