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// Copyright 2020 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#include "pw_kvs/checksum.h"
#include "gtest/gtest.h"
#include "pw_kvs/crc16_checksum.h"
namespace pw::kvs {
namespace {
using std::byte;
constexpr std::string_view kString =
"In the beginning the Universe was created. This has made a lot of "
"people very angry and been widely regarded as a bad move.";
constexpr uint16_t kStringCrc = 0xC184;
TEST(Checksum, UpdateAndVerify) {
ChecksumCrc16 crc16_algo;
ChecksumAlgorithm& algo = crc16_algo;
algo.Update(kString.data(), kString.size());
EXPECT_EQ(OkStatus(), algo.Verify(std::as_bytes(std::span(&kStringCrc, 1))));
}
TEST(Checksum, Verify_Failure) {
ChecksumCrc16 algo;
EXPECT_EQ(Status::DataLoss(),
algo.Verify(std::as_bytes(std::span(kString.data(), 2))));
}
TEST(Checksum, Verify_InvalidSize) {
ChecksumCrc16 algo;
EXPECT_EQ(Status::InvalidArgument(), algo.Verify({}));
EXPECT_EQ(Status::InvalidArgument(),
algo.Verify(std::as_bytes(std::span(kString.substr(0, 1)))));
}
TEST(Checksum, Verify_LargerState_ComparesToTruncatedData) {
byte crc[3] = {byte{0x84}, byte{0xC1}, byte{0x33}};
ChecksumCrc16 algo;
ASSERT_GT(sizeof(crc), algo.size_bytes());
algo.Update(std::as_bytes(std::span(kString)));
EXPECT_EQ(OkStatus(), algo.Verify(crc));
}
TEST(Checksum, Reset) {
ChecksumCrc16 crc_algo;
crc_algo.Update(std::as_bytes(std::span(kString)));
crc_algo.Reset();
std::span state = crc_algo.Finish();
EXPECT_EQ(state[0], byte{0xFF});
EXPECT_EQ(state[1], byte{0xFF});
}
TEST(IgnoreChecksum, NeverUpdate_VerifyWithoutData) {
IgnoreChecksum checksum;
EXPECT_EQ(OkStatus(), checksum.Verify({}));
}
TEST(IgnoreChecksum, NeverUpdate_VerifyWithData) {
IgnoreChecksum checksum;
EXPECT_EQ(OkStatus(), checksum.Verify(std::as_bytes(std::span(kString))));
}
TEST(IgnoreChecksum, AfterUpdate_Verify) {
IgnoreChecksum checksum;
checksum.Update(std::as_bytes(std::span(kString)));
EXPECT_EQ(OkStatus(), checksum.Verify({}));
}
constexpr size_t kAlignment = 10;
constexpr std::string_view kData =
"123456789_123456789_123456789_123456789_123456789_" // 50
"123456789_123456789_123456789_123456789_123456789_"; // 100
const std::span<const byte> kBytes = std::as_bytes(std::span(kData));
class PickyChecksum final : public AlignedChecksum<kAlignment, 32> {
public:
PickyChecksum() : AlignedChecksum(data_), data_{}, size_(0) {}
void Reset() override {}
void FinalizeAligned() override { EXPECT_EQ(kData.size(), size_); }
void UpdateAligned(std::span<const std::byte> data) override {
ASSERT_EQ(data.size() % kAlignment, 0u);
EXPECT_EQ(kData.substr(0, data.size()),
std::string_view(reinterpret_cast<const char*>(data.data()),
data.size()));
std::memcpy(&data_[size_], data.data(), data.size());
size_ += data.size();
}
private:
std::byte data_[kData.size()];
size_t size_;
};
TEST(AlignedChecksum, MaintainsAlignment) {
PickyChecksum checksum;
// Write values smaller than the alignment.
checksum.Update(kBytes.subspan(0, 1));
checksum.Update(kBytes.subspan(1, 9));
// Write values larger than the alignment but smaller than the buffer.
checksum.Update(kBytes.subspan(10, 11));
// Exactly fill the remainder of the buffer.
checksum.Update(kBytes.subspan(21, 11));
// Fill the buffer more than once.
checksum.Update(kBytes.subspan(32, 66));
// Write nothing.
checksum.Update(kBytes.subspan(98, 0));
// Write the remaining data.
checksum.Update(kBytes.subspan(98, 2));
auto state = checksum.Finish();
EXPECT_EQ(std::string_view(reinterpret_cast<const char*>(state.data()),
state.size()),
kData);
EXPECT_EQ(OkStatus(), checksum.Verify(kBytes));
}
} // namespace
} // namespace pw::kvs
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