You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
95 lines
2.3 KiB
95 lines
2.3 KiB
// Copyright (c) 2012 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/bucket_ranges.h"
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "testing/gtest/include/gtest/gtest.h"
|
|
|
|
namespace base {
|
|
namespace {
|
|
|
|
TEST(BucketRangesTest, NormalSetup) {
|
|
BucketRanges ranges(5);
|
|
ASSERT_EQ(5u, ranges.size());
|
|
ASSERT_EQ(4u, ranges.bucket_count());
|
|
|
|
for (int i = 0; i < 5; ++i) {
|
|
EXPECT_EQ(0, ranges.range(i));
|
|
}
|
|
EXPECT_EQ(0u, ranges.checksum());
|
|
|
|
ranges.set_range(3, 100);
|
|
EXPECT_EQ(100, ranges.range(3));
|
|
}
|
|
|
|
TEST(BucketRangesTest, Equals) {
|
|
// Compare empty ranges.
|
|
BucketRanges ranges1(3);
|
|
BucketRanges ranges2(3);
|
|
BucketRanges ranges3(5);
|
|
|
|
EXPECT_TRUE(ranges1.Equals(&ranges2));
|
|
EXPECT_FALSE(ranges1.Equals(&ranges3));
|
|
EXPECT_FALSE(ranges2.Equals(&ranges3));
|
|
|
|
// Compare full filled ranges.
|
|
ranges1.set_range(0, 0);
|
|
ranges1.set_range(1, 1);
|
|
ranges1.set_range(2, 2);
|
|
ranges1.set_checksum(100);
|
|
ranges2.set_range(0, 0);
|
|
ranges2.set_range(1, 1);
|
|
ranges2.set_range(2, 2);
|
|
ranges2.set_checksum(100);
|
|
|
|
EXPECT_TRUE(ranges1.Equals(&ranges2));
|
|
|
|
// Checksum does not match.
|
|
ranges1.set_checksum(99);
|
|
EXPECT_FALSE(ranges1.Equals(&ranges2));
|
|
ranges1.set_checksum(100);
|
|
|
|
// Range does not match.
|
|
ranges1.set_range(1, 3);
|
|
EXPECT_FALSE(ranges1.Equals(&ranges2));
|
|
}
|
|
|
|
TEST(BucketRangesTest, Checksum) {
|
|
BucketRanges ranges(3);
|
|
ranges.set_range(0, 0);
|
|
ranges.set_range(1, 1);
|
|
ranges.set_range(2, 2);
|
|
|
|
ranges.ResetChecksum();
|
|
EXPECT_EQ(289217253u, ranges.checksum());
|
|
|
|
ranges.set_range(2, 3);
|
|
EXPECT_FALSE(ranges.HasValidChecksum());
|
|
|
|
ranges.ResetChecksum();
|
|
EXPECT_EQ(2843835776u, ranges.checksum());
|
|
EXPECT_TRUE(ranges.HasValidChecksum());
|
|
}
|
|
|
|
// Table was generated similarly to sample code for CRC-32 given on:
|
|
// http://www.w3.org/TR/PNG/#D-CRCAppendix.
|
|
TEST(BucketRangesTest, Crc32TableTest) {
|
|
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);
|
|
}
|
|
}
|
|
|
|
} // namespace
|
|
} // namespace base
|