squall/test/Big.cpp

#include "storm/Big.hpp"
#include "storm/big/Ops.hpp"
#include "test/Test.hpp"

TEST_CASE("ExtractLowPart", "[big]") {
    SECTION("extracts low part of 0") {
        uint64_t value = 0;
        auto low = ExtractLowPart(value);

        REQUIRE(low == 0);
        REQUIRE(value == 0);
    }

    SECTION("extracts low part of 0x12345678") {
        uint64_t value = 0x12345678;
        auto low = ExtractLowPart(value);

        REQUIRE(low == 0x12345678);
        REQUIRE(value == 0);
    }

    SECTION("extracts low part of 0xAAAABBBBCCCCDDDD") {
        uint64_t value = 0xAAAABBBBCCCCDDDD;
        auto low = ExtractLowPart(value);

        REQUIRE(low == 0xCCCCDDDD);
        REQUIRE(value == 0xAAAABBBB);
    }
}

TEST_CASE("ExtractLowPartSx", "[big]") {
    SECTION("extracts low part of 0") {
        uint64_t value = 0;
        auto low = ExtractLowPartSx(value);

        REQUIRE(low == 0);
        REQUIRE(value == 0);
    }

    SECTION("extracts low part of 0x12345678") {
        uint64_t value = 0x12345678;
        auto low = ExtractLowPartSx(value);

        REQUIRE(low == 0x12345678);
        REQUIRE(value == 0);
    }

    SECTION("extracts low part of 0xAAAABBBBCCCCDDDD") {
        uint64_t value = 0xAAAABBBBCCCCDDDD;
        auto low = ExtractLowPartSx(value);

        REQUIRE(low == 0xCCCCDDDD);
        REQUIRE(value == 0xFFFFFFFFAAAABBBB);
    }
}

TEST_CASE("MakeLarge", "[big]") {
    SECTION("creates uint64_t out of 0xAABBCCDD and 0x11223344") {
        uint64_t value = MakeLarge(0xAABBCCDD, 0x11223344);

        REQUIRE(value == 0x11223344AABBCCDD);
    }

    SECTION("creates uint64_t out of 0 and 0x11223344") {
        uint64_t value = MakeLarge(0x00000000, 0x11223344);

        REQUIRE(value == 0x1122334400000000);
    }
}

TEST_CASE("SBigFromUnsigned", "[big]") {
    SECTION("creates bigdata from 0") {
        BigData* num;
        SBigNew(&num);
        SBigFromUnsigned(num, 0);

        CHECK(num->Primary().Count() == 1);
        CHECK(num->Primary()[0] == 0);
    }

    SECTION("creates bigdata from 0x12345678") {
        BigData* num;
        SBigNew(&num);
        SBigFromUnsigned(num, 0x12345678);

        CHECK(num->Primary().Count() == 1);
        CHECK(num->Primary()[0] == 0x12345678);
    }
}

TEST_CASE("SBigToBinaryBuffer", "[big]") {
    SECTION("returns expected buffer for bigdata representing 0") {
        BigData* num;
        SBigNew(&num);
        SBigFromUnsigned(num, 0);

        uint8_t buffer[4];
        uint32_t bytes;
        SBigToBinaryBuffer(num, buffer, sizeof(buffer), &bytes);

        REQUIRE(bytes == 0);
    }

    SECTION("returns expected buffer for bigdata representing 0x12345678") {
        BigData* num;
        SBigNew(&num);
        SBigFromUnsigned(num, 0x12345678);

        uint8_t buffer[4];
        uint32_t bytes;
        SBigToBinaryBuffer(num, buffer, sizeof(buffer), &bytes);

        CHECK(bytes == 4);
        CHECK(*reinterpret_cast<uint32_t*>(buffer) == 0x12345678);
    }
}