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test_lfsr.cpp
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#include <lfsr.hpp>
#include <test_detail.hpp>
#include <gtest/gtest.h>
#include <format>
#include <set>
#include <cmath>
using tap_lists = ::testing::Types<
detail::taps_0_1_2,
detail::taps_0_2_3,
detail::taps_0_3_4,
detail::taps_0_3_5,
detail::taps_0_5_6,
detail::taps_0_6_7,
detail::taps_0_4_5_6_8,
detail::taps_0_5_9,
detail::taps_0_7_10,
detail::taps_0_9_11,
detail::taps_0_4_10_11_12,
detail::taps_0_8_11_12_13,
detail::taps_0_2_12_13_14,
detail::taps_0_14_15,
detail::taps_0_4_13_15_16,
detail::taps_0_14_17,
detail::taps_0_11_18,
detail::taps_0_14_17_18_19,
detail::taps_0_17_20,
detail::taps_0_19_21,
detail::taps_0_21_22,
detail::taps_0_18_23,
detail::taps_0_17_20_22_23_24
>;
template <typename TapList>
struct LFSRFibonacciBulk : public testing::Test {};
template <typename TapList>
struct LFSRFibonacci : public testing::Test {};
template <typename TapList>
struct LFSRGalois : public testing::Test {};
TYPED_TEST_SUITE(LFSRFibonacciBulk,
tap_lists,
detail::NameGenerator<"feedthrough_fibonacci_bulk">);
TYPED_TEST_SUITE(LFSRFibonacci,
tap_lists,
detail::NameGenerator<"feedthrough_fibonacci">);
TYPED_TEST_SUITE(LFSRGalois,
tap_lists,
detail::NameGenerator<"feedthrough_galois">);
TYPED_TEST(LFSRFibonacciBulk, IsMaximalLength)
{
using lfsr_type = detail::feedthrough_fibonacci_bulk_from_list_t<TypeParam>;
auto lfsr = lfsr_type{};
auto period = 0;
auto limit = lfsr_type::period * 2;
auto expected_period = lfsr_type::period;
auto expected_state = lfsr.state();
while (period++ < limit)
{
lfsr.scramble_bit(0);
if (lfsr.state() == expected_state) {
break;
}
}
EXPECT_EQ(period, expected_period);
}
TYPED_TEST(LFSRFibonacciBulk, ScrambledThenDescrambledEqualsInput)
{
using lfsr_type = detail::feedthrough_fibonacci_bulk_from_list_t<TypeParam>;
auto scrambler = lfsr_type{};
auto descrambler = lfsr_type{};
auto to_scramble = std::vector<std::uint8_t>{
0x00, 0x01, 0x02, 0x03,
0x04, 0x05, 0x06, 0x07,
};
for (auto b : to_scramble) {
auto scrambled = scrambler.scramble_byte(b);
auto descrambled = descrambler.descramble_byte(scrambled);
ASSERT_EQ(b, descrambled)
<< std::format("0x{:02x} -> 0x{:02x} -> 0x{:02x}", b, scrambled, descrambled);
}
}
TYPED_TEST(LFSRFibonacciBulk, ScrambledDoesNotEqualInput)
{
using lfsr_type = detail::feedthrough_fibonacci_bulk_from_list_t<TypeParam>;
using tap_list = typename lfsr_type::traits::tap_list;
auto scrambler = lfsr_type{};
auto descrambler = lfsr_type{};
auto to_scramble = std::vector<std::uint8_t>{
0x00, 0x01, 0x02, 0x03,
0x04, 0x05, 0x06, 0x07,
};
for (auto ii = 0ul; ii != to_scramble.size(); ++ii) {
auto b = to_scramble[ii];
auto scrambled = scrambler.scramble_byte(b);
if ((ii * 8) < tap_list::lowest()) {
continue;
}
EXPECT_NE(b, scrambled)
<< std::format("0x{:02x} -> 0x{:02x}", b, scrambled);
}
}
TYPED_TEST(LFSRFibonacciBulk, ScrambledResultIsSameAsNonBulk)
{
using lfsr_type = detail::feedthrough_fibonacci_from_list_t<TypeParam>;
using lfsr_bulk_type = detail::feedthrough_fibonacci_bulk_from_list_t<TypeParam>;
auto scrambler = lfsr_type{};
auto bulk_scrambler = lfsr_type{};
auto to_scramble = std::vector<std::uint8_t>{
0x00, 0x01, 0x02, 0x03,
0x04, 0x05, 0x06, 0x07,
};
for (auto b : to_scramble) {
auto scrambled = scrambler.scramble_byte(b);
auto bulk_scrambled = bulk_scrambler.scramble_byte(b);
ASSERT_EQ(scrambled, bulk_scrambled)
<< std::format("0x{:02x} (-> 0x{:02x}) (-> 0x{:02x})", b, scrambled, bulk_scrambled);
}
}
TYPED_TEST(LFSRFibonacci, IsMaximalLength)
{
using lfsr_type = detail::feedthrough_fibonacci_from_list_t<TypeParam>;
auto lfsr = lfsr_type{};
auto period = 0;
auto limit = lfsr_type::period * 2;
auto expected_period = lfsr_type::period;
auto expected_state = lfsr.state();
while (period++ < limit)
{
lfsr.scramble_bit(0);
if (lfsr.state() == expected_state) {
break;
}
}
EXPECT_EQ(period, expected_period);
}
TYPED_TEST(LFSRFibonacci, ScrambledThenDescrambledEqualsInput)
{
using lfsr_type = detail::feedthrough_fibonacci_from_list_t<TypeParam>;
auto scrambler = lfsr_type{};
auto descrambler = lfsr_type{};
auto to_scramble = std::vector<std::uint8_t>{
0x00, 0x01, 0x02, 0x03,
0x04, 0x05, 0x06, 0x07,
};
for (auto b : to_scramble) {
auto scrambled = scrambler.scramble_byte(b);
auto descrambled = descrambler.descramble_byte(scrambled);
ASSERT_EQ(b, descrambled)
<< std::format("0x{:02x} -> 0x{:02x} -> 0x{:02x}", b, scrambled, descrambled);
}
}
TYPED_TEST(LFSRFibonacci, ScrambledDoesNotEqualInput)
{
using lfsr_type = detail::feedthrough_fibonacci_from_list_t<TypeParam>;
using tap_list = typename lfsr_type::traits::tap_list;
auto scrambler = lfsr_type{};
auto descrambler = lfsr_type{};
auto to_scramble = std::vector<std::uint8_t>{
0x00, 0x01, 0x02, 0x03,
0x04, 0x05, 0x06, 0x07,
};
for (auto ii = 0ul; ii != to_scramble.size(); ++ii) {
auto b = to_scramble[ii];
auto scrambled = scrambler.scramble_byte(b);
if ((ii * 8) < tap_list::lowest()) {
continue;
}
EXPECT_NE(b, scrambled)
<< std::format("0x{:02x} -> 0x{:02x}", b, scrambled);
}
}
TYPED_TEST(LFSRGalois, IsMaximalLength)
{
using lfsr_type = detail::feedthrough_galois_from_list_t<TypeParam>;
auto lfsr = lfsr_type{};
auto period = 0;
auto limit = lfsr_type::period * 2;
auto expected_period = lfsr_type::period;
auto expected_state = lfsr.state();
while (period++ < limit)
{
lfsr.scramble_bit(0);
if (lfsr.state() == expected_state) {
break;
}
}
EXPECT_EQ(period, expected_period);
}
TYPED_TEST(LFSRGalois, ScrambledThenDescrambledEqualsInput)
{
using lfsr_type = detail::feedthrough_galois_from_list_t<TypeParam>;
auto scrambler = lfsr_type{};
auto descrambler = lfsr_type{};
auto to_scramble = std::vector<std::uint8_t>{
0x00, 0x01, 0x02, 0x03,
0x04, 0x05, 0x06, 0x07,
};
for (auto b : to_scramble) {
auto scrambled = scrambler.scramble_byte(b);
auto descrambled = descrambler.descramble_byte(scrambled);
ASSERT_EQ(b, descrambled)
<< std::format("0x{:02x} -> 0x{:02x} -> 0x{:02x}", b, scrambled, descrambled);
}
}
TYPED_TEST(LFSRGalois, ScrambledDoesNotEqualInput)
{
using lfsr_type = detail::feedthrough_galois_from_list_t<TypeParam>;
auto scrambler = lfsr_type{};
auto descrambler = lfsr_type{};
auto to_scramble = std::vector<std::uint8_t>{
0x00, 0x01, 0x02, 0x03,
0x04, 0x05, 0x06, 0x07,
};
for (auto b : to_scramble) {
auto scrambled = scrambler.scramble_byte(b);
ASSERT_NE(b, scrambled)
<< std::format("0x{:02x} -> 0x{:02x}", b, scrambled);
}
}