Nelze vybrat více než 25 témat
Téma musí začínat písmenem nebo číslem, může obsahovat pomlčky („-“) a může být dlouhé až 35 znaků.
86 řádky
2.2 KiB
86 řádky
2.2 KiB
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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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. See the AUTHORS file for names of contributors.
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#include "util/crc32c.h"
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#include "util/testharness.h"
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namespace leveldb {
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namespace crc32c {
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class CRC { };
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TEST(CRC, StandardResults) {
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// From rfc3720 section B.4.
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char buf[32];
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memset(buf, 0, sizeof(buf));
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ASSERT_EQ(0x8a9136aa, Value(buf, sizeof(buf)));
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memset(buf, 0xff, sizeof(buf));
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ASSERT_EQ(0x62a8ab43, Value(buf, sizeof(buf)));
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for (int i = 0; i < 32; i++) {
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buf[i] = i;
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}
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ASSERT_EQ(0x46dd794e, Value(buf, sizeof(buf)));
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for (int i = 0; i < 32; i++) {
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buf[i] = 31 - i;
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}
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ASSERT_EQ(0x113fdb5c, Value(buf, sizeof(buf)));
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unsigned char data[48] = {
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0x01, 0xc0, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x14, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x04, 0x00,
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0x00, 0x00, 0x00, 0x14,
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0x00, 0x00, 0x00, 0x18,
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0x28, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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0x02, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00,
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};
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ASSERT_EQ(0xd9963a56, Value(reinterpret_cast<char*>(data), sizeof(data)));
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}
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TEST(CRC, Values) {
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ASSERT_NE(Value("a", 1), Value("foo", 3));
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}
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TEST(CRC, Extend) {
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ASSERT_EQ(Value("hello world", 11),
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Extend(Value("hello ", 6), "world", 5));
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}
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TEST(CRC, Mask) {
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uint32_t crc = Value("foo", 3);
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ASSERT_NE(crc, Mask(crc));
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ASSERT_NE(crc, Mask(Mask(crc)));
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ASSERT_EQ(crc, Unmask(Mask(crc)));
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ASSERT_EQ(crc, Unmask(Unmask(Mask(Mask(crc)))));
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}
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TEST(CRC, Benchmark) {
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std::string data(1048576 * 100, 'x');
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double start = Env::Default()->NowMicros() * 1e-6;
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static const int kIters = 10;
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uint32_t crc = 0;
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for (int i = 0; i < kIters; i++) {
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crc |= Value(data.data(), data.size());
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}
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double finish = Env::Default()->NowMicros() * 1e-6;
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double mb = (static_cast<long long int>(data.size()) * kIters) / 1048576.0;
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fprintf(stderr, "CRC %0.0f MB: %.3f secs; %.1f MB/s, crc=0x%08x\n",
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mb, (finish - start), mb / (finish - start), crc);
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}
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}
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}
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int main(int argc, char** argv) {
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return leveldb::test::RunAllTests();
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}
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