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193 行
5.4 KiB
193 行
5.4 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/coding.h"
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#include <vector>
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#include "gtest/gtest.h"
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namespace leveldb {
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TEST(Coding, Fixed32) {
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std::string s;
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for (uint32_t v = 0; v < 100000; v++) {
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PutFixed32(&s, v);
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}
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const char* p = s.data();
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for (uint32_t v = 0; v < 100000; v++) {
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uint32_t actual = DecodeFixed32(p);
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ASSERT_EQ(v, actual);
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p += sizeof(uint32_t);
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}
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}
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TEST(Coding, Fixed64) {
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std::string s;
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for (int power = 0; power <= 63; power++) {
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uint64_t v = static_cast<uint64_t>(1) << power;
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PutFixed64(&s, v - 1);
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PutFixed64(&s, v + 0);
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PutFixed64(&s, v + 1);
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}
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const char* p = s.data();
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for (int power = 0; power <= 63; power++) {
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uint64_t v = static_cast<uint64_t>(1) << power;
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uint64_t actual;
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actual = DecodeFixed64(p);
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ASSERT_EQ(v - 1, actual);
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p += sizeof(uint64_t);
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actual = DecodeFixed64(p);
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ASSERT_EQ(v + 0, actual);
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p += sizeof(uint64_t);
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actual = DecodeFixed64(p);
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ASSERT_EQ(v + 1, actual);
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p += sizeof(uint64_t);
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}
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}
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// Test that encoding routines generate little-endian encodings
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TEST(Coding, EncodingOutput) {
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std::string dst;
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PutFixed32(&dst, 0x04030201);
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ASSERT_EQ(4, dst.size());
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ASSERT_EQ(0x01, static_cast<int>(dst[0]));
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ASSERT_EQ(0x02, static_cast<int>(dst[1]));
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ASSERT_EQ(0x03, static_cast<int>(dst[2]));
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ASSERT_EQ(0x04, static_cast<int>(dst[3]));
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dst.clear();
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PutFixed64(&dst, 0x0807060504030201ull);
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ASSERT_EQ(8, dst.size());
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ASSERT_EQ(0x01, static_cast<int>(dst[0]));
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ASSERT_EQ(0x02, static_cast<int>(dst[1]));
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ASSERT_EQ(0x03, static_cast<int>(dst[2]));
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ASSERT_EQ(0x04, static_cast<int>(dst[3]));
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ASSERT_EQ(0x05, static_cast<int>(dst[4]));
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ASSERT_EQ(0x06, static_cast<int>(dst[5]));
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ASSERT_EQ(0x07, static_cast<int>(dst[6]));
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ASSERT_EQ(0x08, static_cast<int>(dst[7]));
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}
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TEST(Coding, Varint32) {
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std::string s;
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for (uint32_t i = 0; i < (32 * 32); i++) {
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uint32_t v = (i / 32) << (i % 32);
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PutVarint32(&s, v);
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}
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const char* p = s.data();
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const char* limit = p + s.size();
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for (uint32_t i = 0; i < (32 * 32); i++) {
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uint32_t expected = (i / 32) << (i % 32);
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uint32_t actual;
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const char* start = p;
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p = GetVarint32Ptr(p, limit, &actual);
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ASSERT_TRUE(p != nullptr);
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ASSERT_EQ(expected, actual);
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ASSERT_EQ(VarintLength(actual), p - start);
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}
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ASSERT_EQ(p, s.data() + s.size());
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}
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TEST(Coding, Varint64) {
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// Construct the list of values to check
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std::vector<uint64_t> values;
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// Some special values
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values.push_back(0);
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values.push_back(100);
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values.push_back(~static_cast<uint64_t>(0));
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values.push_back(~static_cast<uint64_t>(0) - 1);
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for (uint32_t k = 0; k < 64; k++) {
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// Test values near powers of two
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const uint64_t power = 1ull << k;
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values.push_back(power);
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values.push_back(power - 1);
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values.push_back(power + 1);
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}
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std::string s;
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for (size_t i = 0; i < values.size(); i++) {
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PutVarint64(&s, values[i]);
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}
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const char* p = s.data();
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const char* limit = p + s.size();
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for (size_t i = 0; i < values.size(); i++) {
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ASSERT_TRUE(p < limit);
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uint64_t actual;
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const char* start = p;
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p = GetVarint64Ptr(p, limit, &actual);
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ASSERT_TRUE(p != nullptr);
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ASSERT_EQ(values[i], actual);
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ASSERT_EQ(VarintLength(actual), p - start);
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}
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ASSERT_EQ(p, limit);
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}
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TEST(Coding, Varint32Overflow) {
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uint32_t result;
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std::string input("\x81\x82\x83\x84\x85\x11");
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ASSERT_TRUE(GetVarint32Ptr(input.data(), input.data() + input.size(),
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&result) == nullptr);
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}
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TEST(Coding, Varint32Truncation) {
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uint32_t large_value = (1u << 31) + 100;
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std::string s;
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PutVarint32(&s, large_value);
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uint32_t result;
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for (size_t len = 0; len < s.size() - 1; len++) {
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ASSERT_TRUE(GetVarint32Ptr(s.data(), s.data() + len, &result) == nullptr);
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}
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ASSERT_TRUE(GetVarint32Ptr(s.data(), s.data() + s.size(), &result) !=
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nullptr);
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ASSERT_EQ(large_value, result);
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}
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TEST(Coding, Varint64Overflow) {
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uint64_t result;
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std::string input("\x81\x82\x83\x84\x85\x81\x82\x83\x84\x85\x11");
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ASSERT_TRUE(GetVarint64Ptr(input.data(), input.data() + input.size(),
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&result) == nullptr);
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}
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TEST(Coding, Varint64Truncation) {
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uint64_t large_value = (1ull << 63) + 100ull;
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std::string s;
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PutVarint64(&s, large_value);
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uint64_t result;
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for (size_t len = 0; len < s.size() - 1; len++) {
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ASSERT_TRUE(GetVarint64Ptr(s.data(), s.data() + len, &result) == nullptr);
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}
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ASSERT_TRUE(GetVarint64Ptr(s.data(), s.data() + s.size(), &result) !=
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nullptr);
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ASSERT_EQ(large_value, result);
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}
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TEST(Coding, Strings) {
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std::string s;
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PutLengthPrefixedSlice(&s, Slice(""));
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PutLengthPrefixedSlice(&s, Slice("foo"));
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PutLengthPrefixedSlice(&s, Slice("bar"));
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PutLengthPrefixedSlice(&s, Slice(std::string(200, 'x')));
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Slice input(s);
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Slice v;
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ASSERT_TRUE(GetLengthPrefixedSlice(&input, &v));
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ASSERT_EQ("", v.ToString());
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ASSERT_TRUE(GetLengthPrefixedSlice(&input, &v));
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ASSERT_EQ("foo", v.ToString());
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ASSERT_TRUE(GetLengthPrefixedSlice(&input, &v));
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ASSERT_EQ("bar", v.ToString());
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ASSERT_TRUE(GetLengthPrefixedSlice(&input, &v));
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ASSERT_EQ(std::string(200, 'x'), v.ToString());
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ASSERT_EQ("", input.ToString());
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}
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} // namespace leveldb
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