Scott James Remnant | a19e285 | 2021-12-14 17:53:04 -0800 | [diff] [blame] | 1 | // Copyright 2021 The Pigweed Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| 4 | // use this file except in compliance with the License. You may obtain a copy of |
| 5 | // the License at |
| 6 | // |
| 7 | // https://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| 11 | // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| 12 | // License for the specific language governing permissions and limitations under |
| 13 | // the License. |
| 14 | |
| 15 | #include "pw_varint/stream.h" |
| 16 | |
| 17 | #include <array> |
| 18 | #include <cstddef> |
| 19 | #include <cstdint> |
| 20 | #include <cstring> |
| 21 | #include <limits> |
| 22 | |
| 23 | #include "gtest/gtest.h" |
| 24 | #include "pw_stream/memory_stream.h" |
| 25 | |
| 26 | namespace pw::varint { |
| 27 | namespace { |
| 28 | template <size_t kStringSize> |
| 29 | auto MakeBuffer(const char (&data)[kStringSize]) { |
| 30 | constexpr size_t kSizeBytes = kStringSize - 1; |
| 31 | static_assert(kSizeBytes <= 10, "Varint arrays never need be larger than 10"); |
| 32 | |
| 33 | std::array<std::byte, kSizeBytes> array; |
| 34 | std::memcpy(array.data(), data, kSizeBytes); |
| 35 | return array; |
| 36 | } |
| 37 | } // namespace |
| 38 | |
| 39 | TEST(VarintRead, Signed64_SingleByte) { |
| 40 | int64_t value = -1234; |
| 41 | |
| 42 | { |
| 43 | const auto buffer = MakeBuffer("\x00"); |
| 44 | stream::MemoryReader reader(buffer); |
| 45 | const auto sws = Read(reader, &value); |
| 46 | EXPECT_TRUE(sws.ok()); |
| 47 | EXPECT_EQ(sws.size(), 1u); |
| 48 | EXPECT_EQ(value, 0); |
| 49 | } |
| 50 | |
| 51 | { |
| 52 | const auto buffer = MakeBuffer("\x01"); |
| 53 | stream::MemoryReader reader(buffer); |
| 54 | const auto sws = Read(reader, &value); |
| 55 | EXPECT_TRUE(sws.ok()); |
| 56 | EXPECT_EQ(sws.size(), 1u); |
| 57 | EXPECT_EQ(value, -1); |
| 58 | } |
| 59 | |
| 60 | { |
| 61 | const auto buffer = MakeBuffer("\x02"); |
| 62 | stream::MemoryReader reader(buffer); |
| 63 | const auto sws = Read(reader, &value); |
| 64 | EXPECT_TRUE(sws.ok()); |
| 65 | EXPECT_EQ(sws.size(), 1u); |
| 66 | EXPECT_EQ(value, 1); |
| 67 | } |
| 68 | |
| 69 | { |
| 70 | const auto buffer = MakeBuffer("\x03"); |
| 71 | stream::MemoryReader reader(buffer); |
| 72 | const auto sws = Read(reader, &value); |
| 73 | EXPECT_TRUE(sws.ok()); |
| 74 | EXPECT_EQ(sws.size(), 1u); |
| 75 | EXPECT_EQ(value, -2); |
| 76 | } |
| 77 | |
| 78 | { |
| 79 | const auto buffer = MakeBuffer("\x04"); |
| 80 | stream::MemoryReader reader(buffer); |
| 81 | const auto sws = Read(reader, &value); |
| 82 | EXPECT_TRUE(sws.ok()); |
| 83 | EXPECT_EQ(sws.size(), 1u); |
| 84 | EXPECT_EQ(value, 2); |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | TEST(VarintRead, Signed64_MultiByte) { |
| 89 | int64_t value = -1234; |
| 90 | |
| 91 | { |
| 92 | const auto buffer = MakeBuffer("\x80\x01"); |
| 93 | stream::MemoryReader reader(buffer); |
| 94 | const auto sws = Read(reader, &value); |
| 95 | EXPECT_TRUE(sws.ok()); |
| 96 | EXPECT_EQ(sws.size(), 2u); |
| 97 | EXPECT_EQ(value, 64); |
| 98 | } |
| 99 | |
| 100 | { |
| 101 | const auto buffer = MakeBuffer("\x81\x01"); |
| 102 | stream::MemoryReader reader(buffer); |
| 103 | const auto sws = Read(reader, &value); |
| 104 | EXPECT_TRUE(sws.ok()); |
| 105 | EXPECT_EQ(sws.size(), 2u); |
| 106 | EXPECT_EQ(value, -65); |
| 107 | } |
| 108 | |
| 109 | { |
| 110 | const auto buffer = MakeBuffer("\x82\x01"); |
| 111 | stream::MemoryReader reader(buffer); |
| 112 | const auto sws = Read(reader, &value); |
| 113 | EXPECT_TRUE(sws.ok()); |
| 114 | EXPECT_EQ(sws.size(), 2u); |
| 115 | EXPECT_EQ(value, 65); |
| 116 | } |
| 117 | |
| 118 | { |
| 119 | const auto buffer = MakeBuffer("\xff\xff\xff\xff\x0f"); |
| 120 | stream::MemoryReader reader(buffer); |
| 121 | const auto sws = Read(reader, &value); |
| 122 | EXPECT_TRUE(sws.ok()); |
| 123 | EXPECT_EQ(sws.size(), 5u); |
| 124 | EXPECT_EQ(value, std::numeric_limits<int32_t>::min()); |
| 125 | } |
| 126 | |
| 127 | { |
| 128 | const auto buffer = MakeBuffer("\xfe\xff\xff\xff\x0f"); |
| 129 | stream::MemoryReader reader(buffer); |
| 130 | const auto sws = Read(reader, &value); |
| 131 | EXPECT_TRUE(sws.ok()); |
| 132 | EXPECT_EQ(sws.size(), 5u); |
| 133 | EXPECT_EQ(value, std::numeric_limits<int32_t>::max()); |
| 134 | } |
| 135 | |
| 136 | { |
| 137 | const auto buffer = MakeBuffer("\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01"); |
| 138 | stream::MemoryReader reader(buffer); |
| 139 | const auto sws = Read(reader, &value); |
| 140 | EXPECT_TRUE(sws.ok()); |
| 141 | EXPECT_EQ(sws.size(), 10u); |
| 142 | EXPECT_EQ(value, std::numeric_limits<int64_t>::min()); |
| 143 | } |
| 144 | |
| 145 | { |
| 146 | const auto buffer = MakeBuffer("\xfe\xff\xff\xff\xff\xff\xff\xff\xff\x01"); |
| 147 | stream::MemoryReader reader(buffer); |
| 148 | const auto sws = Read(reader, &value); |
| 149 | EXPECT_TRUE(sws.ok()); |
| 150 | EXPECT_EQ(sws.size(), 10u); |
| 151 | EXPECT_EQ(value, std::numeric_limits<int64_t>::max()); |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | TEST(VarintRead, Unsigned64_SingleByte) { |
| 156 | uint64_t value = 1234; |
| 157 | |
| 158 | { |
| 159 | const auto buffer = MakeBuffer("\x00"); |
| 160 | stream::MemoryReader reader(buffer); |
| 161 | const auto sws = Read(reader, &value); |
| 162 | EXPECT_TRUE(sws.ok()); |
| 163 | EXPECT_EQ(sws.size(), 1u); |
| 164 | EXPECT_EQ(value, 0u); |
| 165 | } |
| 166 | |
| 167 | { |
| 168 | const auto buffer = MakeBuffer("\x04"); |
| 169 | stream::MemoryReader reader(buffer); |
| 170 | const auto sws = Read(reader, &value); |
| 171 | EXPECT_TRUE(sws.ok()); |
| 172 | EXPECT_EQ(sws.size(), 1u); |
| 173 | EXPECT_EQ(value, 4u); |
| 174 | } |
| 175 | |
| 176 | { |
| 177 | const auto buffer = MakeBuffer("\x41"); |
| 178 | stream::MemoryReader reader(buffer); |
| 179 | const auto sws = Read(reader, &value); |
| 180 | EXPECT_TRUE(sws.ok()); |
| 181 | EXPECT_EQ(sws.size(), 1u); |
| 182 | EXPECT_EQ(value, 65u); |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | TEST(VarintRead, Unsigned64_MultiByte) { |
| 187 | uint64_t value = -1234; |
| 188 | |
| 189 | { |
| 190 | const auto buffer = MakeBuffer("\x80\x01"); |
| 191 | stream::MemoryReader reader(buffer); |
| 192 | const auto sws = Read(reader, &value); |
| 193 | EXPECT_TRUE(sws.ok()); |
| 194 | EXPECT_EQ(sws.size(), 2u); |
| 195 | EXPECT_EQ(value, 128u); |
| 196 | } |
| 197 | |
| 198 | { |
| 199 | const auto buffer = MakeBuffer("\x81\x01"); |
| 200 | stream::MemoryReader reader(buffer); |
| 201 | const auto sws = Read(reader, &value); |
| 202 | EXPECT_TRUE(sws.ok()); |
| 203 | EXPECT_EQ(sws.size(), 2u); |
| 204 | EXPECT_EQ(value, 129u); |
| 205 | } |
| 206 | |
| 207 | { |
| 208 | const auto buffer = MakeBuffer("\xfe\xff\xff\xff\x0f"); |
| 209 | stream::MemoryReader reader(buffer); |
| 210 | const auto sws = Read(reader, &value); |
| 211 | EXPECT_TRUE(sws.ok()); |
| 212 | EXPECT_EQ(sws.size(), 5u); |
| 213 | EXPECT_EQ(value, std::numeric_limits<uint32_t>::max() - 1); |
| 214 | } |
| 215 | |
| 216 | { |
| 217 | const auto buffer = MakeBuffer("\xff\xff\xff\xff\x0f"); |
| 218 | stream::MemoryReader reader(buffer); |
| 219 | const auto sws = Read(reader, &value); |
| 220 | EXPECT_TRUE(sws.ok()); |
| 221 | EXPECT_EQ(sws.size(), 5u); |
| 222 | EXPECT_EQ(value, std::numeric_limits<uint32_t>::max()); |
| 223 | } |
| 224 | |
| 225 | { |
| 226 | const auto buffer = MakeBuffer("\xfe\xff\xff\xff\xff\xff\xff\xff\xff\x01"); |
| 227 | stream::MemoryReader reader(buffer); |
| 228 | const auto sws = Read(reader, &value); |
| 229 | EXPECT_TRUE(sws.ok()); |
| 230 | EXPECT_EQ(sws.size(), 10u); |
| 231 | EXPECT_EQ(value, std::numeric_limits<uint64_t>::max() - 1); |
| 232 | } |
| 233 | |
| 234 | { |
| 235 | const auto buffer = MakeBuffer("\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01"); |
| 236 | stream::MemoryReader reader(buffer); |
| 237 | const auto sws = Read(reader, &value); |
| 238 | EXPECT_TRUE(sws.ok()); |
| 239 | EXPECT_EQ(sws.size(), 10u); |
| 240 | EXPECT_EQ(value, std::numeric_limits<uint64_t>::max()); |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | } // namespace pw::varint |