crc_memcpy_test.cc | Explore in Territory

// Copyright 2022 The Abseil 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 "absl/crc/internal/crc_memcpy.h"

#include <cstddef>
#include <cstdint>
#include <cstring>
#include <limits>
#include <memory>
#include <string>
#include <utility>

#include "gtest/gtest.h"
#include "absl/crc/crc32c.h"
#include "absl/memory/memory.h"
#include "absl/random/distributions.h"
#include "absl/random/random.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/string_view.h"

namespace {

enum CrcEngine { … };

// Correctness tests:
// - Every source/destination byte alignment 0-15, every size 0-511 bytes
// - Arbitrarily aligned source, large size
template <size_t max_size>
class CrcMemcpyTest : public testing::Test { … };

// Small test is slightly larger 4096 bytes to allow coverage of the "large"
// copy function.  The minimum size to exercise all code paths in that function
// would be around 256 consecutive tests (getting every possible tail value
// and 0-2 small copy loops after the main block), so testing from 4096-4500
// will cover all of those code paths multiple times.
CrcSmallTest;
CrcLargeTest;
// Parametrize the small test so that it can be done with all configurations.
template <typename ParamsT>
class EngineParamTestTemplate : public CrcSmallTest,
                                public ::testing::WithParamInterface<ParamsT> { … };
struct TestParams { … };
EngineParamTest;
// SmallCorrectness is designed to exercise every possible set of code paths
// in the memcpy code, not including the loop.
TEST_P(EngineParamTest, SmallCorrectnessCheckSourceAlignment) { … }

TEST_P(EngineParamTest, SmallCorrectnessCheckDestAlignment) { … }

INSTANTIATE_TEST_SUITE_P(…);

}  // namespace
chromium/third_party/abseil-cpp/absl/crc/internal/crc_memcpy_test.cc
