| // Copyright 2019 The Pigweed Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| // use this file except in compliance with the License. You may obtain a copy of |
| // the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| // License for the specific language governing permissions and limitations under |
| // the License. |
| |
| #include "pw_varint/varint.h" |
| |
| #include <cinttypes> |
| #include <cstdint> |
| #include <cstring> |
| #include <limits> |
| |
| #include "gtest/gtest.h" |
| |
| namespace pw::varint { |
| namespace { |
| |
| class Varint : public ::testing::Test { |
| protected: |
| Varint() : buffer_{'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j'} {} |
| uint8_t buffer_[10]; |
| }; |
| |
| TEST_F(Varint, EncodeSizeUnsigned32_SmallSingleByte) { |
| ASSERT_EQ(1u, EncodeVarint(UINT32_C(0), buffer_)); |
| EXPECT_EQ(0u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(UINT32_C(1), buffer_)); |
| EXPECT_EQ(1u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(UINT32_C(2), buffer_)); |
| EXPECT_EQ(2u, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeUnsigned32_LargeSingleByte) { |
| ASSERT_EQ(1u, EncodeVarint(UINT32_C(63), buffer_)); |
| EXPECT_EQ(63u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(UINT32_C(64), buffer_)); |
| EXPECT_EQ(64u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(UINT32_C(126), buffer_)); |
| EXPECT_EQ(126u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(UINT32_C(127), buffer_)); |
| EXPECT_EQ(127u, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeUnsigned32_MultiByte) { |
| ASSERT_EQ(2u, EncodeVarint(UINT32_C(128), buffer_)); |
| EXPECT_EQ(std::memcmp("\x80\x01", buffer_, 2), 0); |
| ASSERT_EQ(2u, EncodeVarint(UINT32_C(129), buffer_)); |
| EXPECT_EQ(std::memcmp("\x81\x01", buffer_, 2), 0); |
| |
| ASSERT_EQ(5u, |
| EncodeVarint(std::numeric_limits<uint32_t>::max() - 1, buffer_)); |
| EXPECT_EQ(std::memcmp("\xfe\xff\xff\xff\x0f", buffer_, 5), 0); |
| |
| ASSERT_EQ(5u, EncodeVarint(std::numeric_limits<uint32_t>::max(), buffer_)); |
| EXPECT_EQ(std::memcmp("\xff\xff\xff\xff\x0f", buffer_, 5), 0); |
| } |
| |
| TEST_F(Varint, EncodeSizeSigned32_SmallSingleByte) { |
| ASSERT_EQ(1u, EncodeVarint(INT32_C(0), buffer_)); |
| EXPECT_EQ(0u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(INT32_C(-1), buffer_)); |
| EXPECT_EQ(1u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(INT32_C(1), buffer_)); |
| EXPECT_EQ(2u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(INT32_C(-2), buffer_)); |
| EXPECT_EQ(3u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(INT32_C(2), buffer_)); |
| EXPECT_EQ(4u, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeSigned32_LargeSingleByte) { |
| ASSERT_EQ(1u, EncodeVarint(INT32_C(-63), buffer_)); |
| EXPECT_EQ(125u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(INT32_C(63), buffer_)); |
| EXPECT_EQ(126u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(INT32_C(-64), buffer_)); |
| EXPECT_EQ(127u, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeSigned32_MultiByte) { |
| ASSERT_EQ(2u, EncodeVarint(INT32_C(64), buffer_)); |
| EXPECT_EQ(std::memcmp("\x80\x01", buffer_, 2), 0); |
| ASSERT_EQ(2u, EncodeVarint(INT32_C(-65), buffer_)); |
| EXPECT_EQ(std::memcmp("\x81\x01", buffer_, 2), 0); |
| ASSERT_EQ(2u, EncodeVarint(INT32_C(65), buffer_)); |
| EXPECT_EQ(std::memcmp("\x82\x01", buffer_, 2), 0); |
| |
| ASSERT_EQ(5u, EncodeVarint(std::numeric_limits<int32_t>::min(), buffer_)); |
| EXPECT_EQ(std::memcmp("\xff\xff\xff\xff\x0f", buffer_, 5), 0); |
| |
| ASSERT_EQ(5u, EncodeVarint(std::numeric_limits<int32_t>::max(), buffer_)); |
| EXPECT_EQ(std::memcmp("\xfe\xff\xff\xff\x0f", buffer_, 5), 0); |
| } |
| |
| TEST_F(Varint, EncodeSizeUnsigned64_SmallSingleByte) { |
| ASSERT_EQ(1u, EncodeVarint(UINT64_C(0), buffer_)); |
| EXPECT_EQ(0u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(UINT64_C(1), buffer_)); |
| EXPECT_EQ(1u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(UINT64_C(2), buffer_)); |
| EXPECT_EQ(2u, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeUnsigned64_LargeSingleByte) { |
| ASSERT_EQ(1u, EncodeVarint(UINT64_C(63), buffer_)); |
| EXPECT_EQ(63u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(UINT64_C(64), buffer_)); |
| EXPECT_EQ(64u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(UINT64_C(126), buffer_)); |
| EXPECT_EQ(126u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(UINT64_C(127), buffer_)); |
| EXPECT_EQ(127u, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeUnsigned64_MultiByte) { |
| ASSERT_EQ(2u, EncodeVarint(UINT64_C(128), buffer_)); |
| EXPECT_EQ(std::memcmp("\x80\x01", buffer_, 2), 0); |
| ASSERT_EQ(2u, EncodeVarint(UINT64_C(129), buffer_)); |
| EXPECT_EQ(std::memcmp("\x81\x01", buffer_, 2), 0); |
| |
| ASSERT_EQ(5u, |
| EncodeVarint(std::numeric_limits<uint32_t>::max() - 1, buffer_)); |
| EXPECT_EQ(std::memcmp("\xfe\xff\xff\xff\x0f", buffer_, 5), 0); |
| |
| ASSERT_EQ(5u, EncodeVarint(std::numeric_limits<uint32_t>::max(), buffer_)); |
| EXPECT_EQ(std::memcmp("\xff\xff\xff\xff\x0f", buffer_, 5), 0); |
| |
| ASSERT_EQ(10u, |
| EncodeVarint(std::numeric_limits<uint64_t>::max() - 1, buffer_)); |
| EXPECT_EQ( |
| std::memcmp("\xfe\xff\xff\xff\xff\xff\xff\xff\xff\x01", buffer_, 10), 0); |
| |
| ASSERT_EQ(10u, EncodeVarint(std::numeric_limits<uint64_t>::max(), buffer_)); |
| EXPECT_EQ( |
| std::memcmp("\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01", buffer_, 10), 0); |
| } |
| |
| TEST_F(Varint, EncodeSizeSigned64_SmallSingleByte) { |
| ASSERT_EQ(1u, EncodeVarint(INT64_C(0), buffer_)); |
| EXPECT_EQ(0u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(INT64_C(-1), buffer_)); |
| EXPECT_EQ(1u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(INT64_C(1), buffer_)); |
| EXPECT_EQ(2u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(INT64_C(-2), buffer_)); |
| EXPECT_EQ(3u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(INT64_C(2), buffer_)); |
| EXPECT_EQ(4u, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeSigned64_LargeSingleByte) { |
| ASSERT_EQ(1u, EncodeVarint(INT64_C(-63), buffer_)); |
| EXPECT_EQ(125u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(INT64_C(63), buffer_)); |
| EXPECT_EQ(126u, buffer_[0]); |
| ASSERT_EQ(1u, EncodeVarint(INT64_C(-64), buffer_)); |
| EXPECT_EQ(127u, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeSigned64_MultiByte) { |
| ASSERT_EQ(2u, EncodeVarint(INT64_C(64), buffer_)); |
| EXPECT_EQ(std::memcmp("\x80\x01", buffer_, 2), 0); |
| ASSERT_EQ(2u, EncodeVarint(INT64_C(-65), buffer_)); |
| EXPECT_EQ(std::memcmp("\x81\x01", buffer_, 2), 0); |
| ASSERT_EQ(2u, EncodeVarint(INT64_C(65), buffer_)); |
| EXPECT_EQ(std::memcmp("\x82\x01", buffer_, 2), 0); |
| |
| ASSERT_EQ( |
| 5u, |
| EncodeVarint(static_cast<int64_t>(std::numeric_limits<int32_t>::min()), |
| buffer_)); |
| EXPECT_EQ(std::memcmp("\xff\xff\xff\xff\x0f", buffer_, 5), 0); |
| |
| ASSERT_EQ( |
| 5u, |
| EncodeVarint(static_cast<int64_t>(std::numeric_limits<int32_t>::max()), |
| buffer_)); |
| EXPECT_EQ(std::memcmp("\xfe\xff\xff\xff\x0f", buffer_, 5), 0); |
| |
| ASSERT_EQ(10u, EncodeVarint(std::numeric_limits<int64_t>::min(), buffer_)); |
| EXPECT_EQ( |
| std::memcmp("\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01", buffer_, 10), 0); |
| |
| ASSERT_EQ(10u, EncodeVarint(std::numeric_limits<int64_t>::max(), buffer_)); |
| EXPECT_EQ( |
| std::memcmp("\xfe\xff\xff\xff\xff\xff\xff\xff\xff\x01", buffer_, 10), 0); |
| } |
| |
| TEST_F(Varint, EncodeDecodeSigned32) { |
| // Set the increment to 1 to test every number (this is slow) |
| static constexpr int kIncrement = 1'000'009; |
| |
| int32_t i = std::numeric_limits<int32_t>::min(); |
| while (true) { |
| size_t encoded = EncodeVarint(i, buffer_); |
| |
| int64_t result; |
| size_t decoded = DecodeVarint(buffer_, &result); |
| |
| EXPECT_EQ(encoded, decoded); |
| ASSERT_EQ(i, result); |
| |
| if (i > std::numeric_limits<int32_t>::max() - kIncrement) { |
| break; |
| } |
| |
| i += kIncrement; |
| } |
| } |
| |
| TEST_F(Varint, EncodeDecodeUnsigned32) { |
| // Set the increment to 1 to test every number (this is slow) |
| static constexpr int kIncrement = 1'000'009; |
| |
| uint32_t i = 0; |
| while (true) { |
| size_t encoded = EncodeVarint(i, buffer_); |
| |
| uint64_t result; |
| size_t decoded = DecodeVarint(buffer_, &result); |
| |
| EXPECT_EQ(encoded, decoded); |
| ASSERT_EQ(i, result); |
| |
| if (i > std::numeric_limits<uint32_t>::max() - kIncrement) { |
| break; |
| } |
| |
| i += kIncrement; |
| } |
| } |
| |
| template <size_t kStringSize> |
| auto MakeBuffer(const char (&data)[kStringSize]) { |
| constexpr size_t kSizeBytes = kStringSize - 1; |
| static_assert(kSizeBytes <= 10, "Varint arrays never need be larger than 10"); |
| |
| std::array<uint8_t, kSizeBytes> array; |
| std::memcpy(array.data(), data, kSizeBytes); |
| return array; |
| } |
| |
| TEST(VarintDecode, DecodeSigned64_SingleByte) { |
| int64_t value = -1234; |
| |
| EXPECT_EQ(DecodeVarint(MakeBuffer("\x00"), &value), 1u); |
| EXPECT_EQ(value, 0); |
| |
| EXPECT_EQ(DecodeVarint(MakeBuffer("\x01"), &value), 1u); |
| EXPECT_EQ(value, -1); |
| |
| EXPECT_EQ(DecodeVarint(MakeBuffer("\x02"), &value), 1u); |
| EXPECT_EQ(value, 1); |
| |
| EXPECT_EQ(DecodeVarint(MakeBuffer("\x03"), &value), 1u); |
| EXPECT_EQ(value, -2); |
| |
| EXPECT_EQ(DecodeVarint(MakeBuffer("\x04"), &value), 1u); |
| EXPECT_EQ(value, 2); |
| |
| EXPECT_EQ(DecodeVarint(MakeBuffer("\x04"), &value), 1u); |
| EXPECT_EQ(value, 2); |
| } |
| |
| TEST(VarintDecode, DecodeSigned64_MultiByte) { |
| int64_t value = -1234; |
| |
| EXPECT_EQ(DecodeVarint(MakeBuffer("\x80\x01"), &value), 2u); |
| EXPECT_EQ(value, 64); |
| |
| EXPECT_EQ(DecodeVarint(MakeBuffer("\x81\x01"), &value), 2u); |
| EXPECT_EQ(value, -65); |
| |
| EXPECT_EQ(DecodeVarint(MakeBuffer("\x82\x01"), &value), 2u); |
| EXPECT_EQ(value, 65); |
| |
| EXPECT_EQ(DecodeVarint(MakeBuffer("\xff\xff\xff\xff\x0f"), &value), 5u); |
| EXPECT_EQ(value, std::numeric_limits<int32_t>::min()); |
| |
| EXPECT_EQ(DecodeVarint(MakeBuffer("\xfe\xff\xff\xff\x0f"), &value), 5u); |
| EXPECT_EQ(value, std::numeric_limits<int32_t>::max()); |
| |
| EXPECT_EQ(DecodeVarint(MakeBuffer("\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01"), |
| &value), |
| 10u); |
| EXPECT_EQ(value, std::numeric_limits<int64_t>::min()); |
| |
| EXPECT_EQ(DecodeVarint(MakeBuffer("\xfe\xff\xff\xff\xff\xff\xff\xff\xff\x01"), |
| &value), |
| 10u); |
| EXPECT_EQ(value, std::numeric_limits<int64_t>::max()); |
| } |
| |
| } // namespace |
| } // namespace pw::varint |