35 lines
860 B
C++
35 lines
860 B
C++
// Copyright 2019 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/metrics/crc32.h"
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#include <stdint.h>
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#include "testing/gtest/include/gtest/gtest.h"
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namespace base {
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// Table was generated similarly to sample code for CRC-32 given on:
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// http://www.w3.org/TR/PNG/#D-CRCAppendix.
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TEST(Crc32Test, TableTest) {
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for (int i = 0; i < 256; ++i) {
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uint32_t checksum = i;
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for (int j = 0; j < 8; ++j) {
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const uint32_t kReversedPolynomial = 0xEDB88320L;
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if (checksum & 1)
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checksum = kReversedPolynomial ^ (checksum >> 1);
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else
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checksum >>= 1;
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}
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EXPECT_EQ(kCrcTable[i], checksum);
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}
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}
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// A CRC of nothing should always be zero.
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TEST(Crc32Test, ZeroTest) {
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EXPECT_EQ(0U, Crc32(0, nullptr, 0));
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}
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} // namespace base
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