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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/util/bits.h>
#include <vespa/vespalib/gtest/gtest.h>
using namespace vespalib;
class BitsTest : public ::testing::Test
{
protected:
BitsTest();
~BitsTest() override;
template <typename T>
void testFixed(const T * v, size_t sz, const T * exp);
void testBuffer();
};
BitsTest::BitsTest() = default;
BitsTest::~BitsTest() = default;
TEST_F(BitsTest, test_bits)
{
uint8_t u8[5] = { 0, 0x1, 0x7f, 0x87, 0xff };
uint8_t exp8[5] = { 0, 0x80, 0xfe, 0xe1, 0xff };
testFixed(u8, sizeof(u8)/sizeof(u8[0]), exp8);
uint16_t u16[5] = { 0, 0x1, 0x7f, 0x87, 0xff };
uint16_t exp16[5] = { 0, 0x8000, 0xfe00, 0xe100, 0xff00 };
testFixed(u16, sizeof(u16)/sizeof(u16[0]), exp16);
uint32_t u32[5] = { 0, 0x1, 0x7f, 0x87, 0xff };
uint32_t exp32[5] = { 0, 0x80000000, 0xfe000000, 0xe1000000, 0xff000000 };
testFixed(u32, sizeof(u32)/sizeof(u32[0]), exp32);
uint64_t u64[5] = { 0, 0x1, 0x7f, 0x87, 0xff };
uint64_t exp64[5] = { 0, 0x8000000000000000, 0xfe00000000000000, 0xe100000000000000, 0xff00000000000000 };
testFixed(u64, sizeof(u64)/sizeof(u64[0]), exp64);
testBuffer();
}
template <typename T>
void BitsTest::testFixed(const T * v, size_t sz, const T * exp)
{
EXPECT_EQ(0u, Bits::reverse(static_cast<T>(0)));
EXPECT_EQ(1ul << (sizeof(T)*8 - 1), Bits::reverse(static_cast<T>(1)));
EXPECT_EQ(static_cast<T>(-1), Bits::reverse(static_cast<T>(-1)));
for (size_t i(0); i < sz; i++) {
EXPECT_EQ(Bits::reverse(v[i]), exp[i]);
EXPECT_EQ(Bits::reverse(Bits::reverse(v[i])), v[i]);
}
}
void BitsTest::testBuffer()
{
uint64_t a(0x0102040810204080ul);
uint64_t b(a);
Bits::reverse(&a, sizeof(a));
EXPECT_EQ(a, Bits::reverse(b));
Bits::reverse(&a, sizeof(a));
EXPECT_EQ(a, b);
}
GTEST_MAIN_RUN_ALL_TESTS()
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