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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/zucchini/crc32.h"
#include <stdint.h>
#include <iterator>
#include "base/test/gtest_util.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace zucchini {
constexpr uint8_t bytes[] = {0x10, 0x32, 0x54, 0x76, 0x98,
0xBA, 0xDC, 0xFE, 0x10, 0x00};
TEST(Crc32Test, All) {
// Results can be verified with any CRC-32 calculator found online.
// Empty region.
EXPECT_EQ(0x00000000U, CalculateCrc32(std::begin(bytes), std::begin(bytes)));
// Single byte.
EXPECT_EQ(0xCFB5FFE9U,
CalculateCrc32(std::begin(bytes), std::begin(bytes) + 1));
// Same byte (0x10) appearing at different location.
EXPECT_EQ(0xCFB5FFE9U,
CalculateCrc32(std::begin(bytes) + 8, std::begin(bytes) + 9));
// Single byte of 0.
EXPECT_EQ(0xD202EF8DU,
CalculateCrc32(std::begin(bytes) + 9, std::end(bytes)));
// Whole region.
EXPECT_EQ(0xA86FD7D6U, CalculateCrc32(std::begin(bytes), std::end(bytes)));
// Whole region excluding 0 at end.
EXPECT_EQ(0x0762F38BU,
CalculateCrc32(std::begin(bytes), std::begin(bytes) + 9));
EXPECT_DCHECK_DEATH(CalculateCrc32(std::begin(bytes) + 1, std::begin(bytes)));
}
} // namespace zucchini
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