1 // Copyright (c) 2011 The LevelDB Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. See the AUTHORS file for names of contributors.
5 #include "util/coding.h"
7 #include "util/testharness.h"
13 TEST(Coding, Fixed32) {
15 for (uint32_t v = 0; v < 100000; v++) {
19 const char* p = s.data();
20 for (uint32_t v = 0; v < 100000; v++) {
21 uint32_t actual = DecodeFixed32(p);
23 p += sizeof(uint32_t);
27 TEST(Coding, Fixed64) {
29 for (int power = 0; power <= 63; power++) {
30 uint64_t v = static_cast<uint64_t>(1) << power;
31 PutFixed64(&s, v - 1);
32 PutFixed64(&s, v + 0);
33 PutFixed64(&s, v + 1);
36 const char* p = s.data();
37 for (int power = 0; power <= 63; power++) {
38 uint64_t v = static_cast<uint64_t>(1) << power;
40 actual = DecodeFixed64(p);
41 ASSERT_EQ(v-1, actual);
42 p += sizeof(uint64_t);
44 actual = DecodeFixed64(p);
45 ASSERT_EQ(v+0, actual);
46 p += sizeof(uint64_t);
48 actual = DecodeFixed64(p);
49 ASSERT_EQ(v+1, actual);
50 p += sizeof(uint64_t);
54 // Test that encoding routines generate little-endian encodings
55 TEST(Coding, EncodingOutput) {
57 PutFixed32(&dst, 0x04030201);
58 ASSERT_EQ(4, dst.size());
59 ASSERT_EQ(0x01, static_cast<int>(dst[0]));
60 ASSERT_EQ(0x02, static_cast<int>(dst[1]));
61 ASSERT_EQ(0x03, static_cast<int>(dst[2]));
62 ASSERT_EQ(0x04, static_cast<int>(dst[3]));
65 PutFixed64(&dst, 0x0807060504030201ull);
66 ASSERT_EQ(8, dst.size());
67 ASSERT_EQ(0x01, static_cast<int>(dst[0]));
68 ASSERT_EQ(0x02, static_cast<int>(dst[1]));
69 ASSERT_EQ(0x03, static_cast<int>(dst[2]));
70 ASSERT_EQ(0x04, static_cast<int>(dst[3]));
71 ASSERT_EQ(0x05, static_cast<int>(dst[4]));
72 ASSERT_EQ(0x06, static_cast<int>(dst[5]));
73 ASSERT_EQ(0x07, static_cast<int>(dst[6]));
74 ASSERT_EQ(0x08, static_cast<int>(dst[7]));
77 TEST(Coding, Varint32) {
79 for (uint32_t i = 0; i < (32 * 32); i++) {
80 uint32_t v = (i / 32) << (i % 32);
84 const char* p = s.data();
85 const char* limit = p + s.size();
86 for (uint32_t i = 0; i < (32 * 32); i++) {
87 uint32_t expected = (i / 32) << (i % 32);
89 const char* start = p;
90 p = GetVarint32Ptr(p, limit, &actual);
91 ASSERT_TRUE(p != NULL);
92 ASSERT_EQ(expected, actual);
93 ASSERT_EQ(VarintLength(actual), p - start);
95 ASSERT_EQ(p, s.data() + s.size());
98 TEST(Coding, Varint64) {
99 // Construct the list of values to check
100 std::vector<uint64_t> values;
101 // Some special values
103 values.push_back(100);
104 values.push_back(~static_cast<uint64_t>(0));
105 values.push_back(~static_cast<uint64_t>(0) - 1);
106 for (uint32_t k = 0; k < 64; k++) {
107 // Test values near powers of two
108 const uint64_t power = 1ull << k;
109 values.push_back(power);
110 values.push_back(power-1);
111 values.push_back(power+1);
115 for (int i = 0; i < values.size(); i++) {
116 PutVarint64(&s, values[i]);
119 const char* p = s.data();
120 const char* limit = p + s.size();
121 for (int i = 0; i < values.size(); i++) {
122 ASSERT_TRUE(p < limit);
124 const char* start = p;
125 p = GetVarint64Ptr(p, limit, &actual);
126 ASSERT_TRUE(p != NULL);
127 ASSERT_EQ(values[i], actual);
128 ASSERT_EQ(VarintLength(actual), p - start);
134 TEST(Coding, Varint32Overflow) {
136 std::string input("\x81\x82\x83\x84\x85\x11");
137 ASSERT_TRUE(GetVarint32Ptr(input.data(), input.data() + input.size(), &result)
141 TEST(Coding, Varint32Truncation) {
142 uint32_t large_value = (1u << 31) + 100;
144 PutVarint32(&s, large_value);
146 for (int len = 0; len < s.size() - 1; len++) {
147 ASSERT_TRUE(GetVarint32Ptr(s.data(), s.data() + len, &result) == NULL);
149 ASSERT_TRUE(GetVarint32Ptr(s.data(), s.data() + s.size(), &result) != NULL);
150 ASSERT_EQ(large_value, result);
153 TEST(Coding, Varint64Overflow) {
155 std::string input("\x81\x82\x83\x84\x85\x81\x82\x83\x84\x85\x11");
156 ASSERT_TRUE(GetVarint64Ptr(input.data(), input.data() + input.size(), &result)
160 TEST(Coding, Varint64Truncation) {
161 uint64_t large_value = (1ull << 63) + 100ull;
163 PutVarint64(&s, large_value);
165 for (int len = 0; len < s.size() - 1; len++) {
166 ASSERT_TRUE(GetVarint64Ptr(s.data(), s.data() + len, &result) == NULL);
168 ASSERT_TRUE(GetVarint64Ptr(s.data(), s.data() + s.size(), &result) != NULL);
169 ASSERT_EQ(large_value, result);
172 TEST(Coding, Strings) {
174 PutLengthPrefixedSlice(&s, Slice(""));
175 PutLengthPrefixedSlice(&s, Slice("foo"));
176 PutLengthPrefixedSlice(&s, Slice("bar"));
177 PutLengthPrefixedSlice(&s, Slice(std::string(200, 'x')));
181 ASSERT_TRUE(GetLengthPrefixedSlice(&input, &v));
182 ASSERT_EQ("", v.ToString());
183 ASSERT_TRUE(GetLengthPrefixedSlice(&input, &v));
184 ASSERT_EQ("foo", v.ToString());
185 ASSERT_TRUE(GetLengthPrefixedSlice(&input, &v));
186 ASSERT_EQ("bar", v.ToString());
187 ASSERT_TRUE(GetLengthPrefixedSlice(&input, &v));
188 ASSERT_EQ(std::string(200, 'x'), v.ToString());
189 ASSERT_EQ("", input.ToString());
192 } // namespace leveldb
194 int main(int argc, char** argv) {
195 return leveldb::test::RunAllTests();