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// Copyright 2019 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 "base/metrics/crc32.h"
#include <stdint.h>
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
// Table was generated similarly to sample code for CRC-32 given on:
// http://www.w3.org/TR/PNG/#D-CRCAppendix.
TEST(Crc32Test, TableTest) {
for (int i = 0; i < 256; ++i) {
uint32_t checksum = i;
for (int j = 0; j < 8; ++j) {
const uint32_t kReversedPolynomial = 0xEDB88320L;
if (checksum & 1)
checksum = kReversedPolynomial ^ (checksum >> 1);
else
checksum >>= 1;
}
EXPECT_EQ(kCrcTable[i], checksum);
}
}
// A CRC of nothing should always be zero.
TEST(Crc32Test, ZeroTest) {
EXPECT_EQ(0U, Crc32(0, nullptr, 0));
}
} // namespace base
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