| // 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 { |
| |
| extern "C" { |
| |
| // Functions defined in varint_test.c which call the varint API from C. |
| size_t pw_varint_CallEncode(uint64_t integer, void* output, size_t output_size); |
| size_t pw_varint_CallZigZagEncode(int64_t integer, |
| void* output, |
| size_t output_size); |
| size_t pw_varint_CallDecode(void* input, size_t input_size, uint64_t* output); |
| size_t pw_varint_CallZigZagDecode(void* input, |
| size_t input_size, |
| int64_t* output); |
| |
| } // extern "C" |
| |
| class Varint : public ::testing::Test { |
| protected: |
| Varint() : buffer_ { |
| std::byte{'a'}, std::byte{'b'}, std::byte{'c'}, std::byte{'d'}, |
| std::byte{'e'}, std::byte{'f'}, std::byte{'g'}, std::byte{'h'}, |
| std::byte{'i'}, std::byte { |
| 'j' |
| } |
| } |
| {} |
| std::byte buffer_[10]; |
| }; |
| |
| TEST_F(Varint, EncodeSizeUnsigned32_SmallSingleByte) { |
| ASSERT_EQ(1u, Encode(UINT32_C(0), buffer_)); |
| EXPECT_EQ(std::byte{0}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(UINT32_C(1), buffer_)); |
| EXPECT_EQ(std::byte{1}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(UINT32_C(2), buffer_)); |
| EXPECT_EQ(std::byte{2}, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeUnsigned32_SmallSingleByte_C) { |
| ASSERT_EQ(1u, pw_varint_CallEncode(UINT32_C(0), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{0}, buffer_[0]); |
| ASSERT_EQ(1u, pw_varint_CallEncode(UINT32_C(1), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{1}, buffer_[0]); |
| ASSERT_EQ(1u, pw_varint_CallEncode(UINT32_C(2), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{2}, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeUnsigned32_LargeSingleByte) { |
| ASSERT_EQ(1u, Encode(UINT32_C(63), buffer_)); |
| EXPECT_EQ(std::byte{63}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(UINT32_C(64), buffer_)); |
| EXPECT_EQ(std::byte{64}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(UINT32_C(126), buffer_)); |
| EXPECT_EQ(std::byte{126}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(UINT32_C(127), buffer_)); |
| EXPECT_EQ(std::byte{127}, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeUnsigned32_LargeSingleByte_C) { |
| ASSERT_EQ(1u, pw_varint_CallEncode(UINT32_C(63), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{63}, buffer_[0]); |
| ASSERT_EQ(1u, pw_varint_CallEncode(UINT32_C(64), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{64}, buffer_[0]); |
| ASSERT_EQ(1u, pw_varint_CallEncode(UINT32_C(126), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{126}, buffer_[0]); |
| ASSERT_EQ(1u, pw_varint_CallEncode(UINT32_C(127), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{127}, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeUnsigned32_MultiByte) { |
| ASSERT_EQ(2u, Encode(UINT32_C(128), buffer_)); |
| EXPECT_EQ(std::memcmp("\x80\x01", buffer_, 2), 0); |
| ASSERT_EQ(2u, Encode(UINT32_C(129), buffer_)); |
| EXPECT_EQ(std::memcmp("\x81\x01", buffer_, 2), 0); |
| |
| ASSERT_EQ(5u, Encode(std::numeric_limits<uint32_t>::max() - 1, buffer_)); |
| EXPECT_EQ(std::memcmp("\xfe\xff\xff\xff\x0f", buffer_, 5), 0); |
| |
| ASSERT_EQ(5u, Encode(std::numeric_limits<uint32_t>::max(), buffer_)); |
| EXPECT_EQ(std::memcmp("\xff\xff\xff\xff\x0f", buffer_, 5), 0); |
| } |
| |
| TEST_F(Varint, EncodeSizeUnsigned32_MultiByte_C) { |
| ASSERT_EQ(2u, pw_varint_CallEncode(UINT32_C(128), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::memcmp("\x80\x01", buffer_, 2), 0); |
| ASSERT_EQ(2u, pw_varint_CallEncode(UINT32_C(129), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::memcmp("\x81\x01", buffer_, 2), 0); |
| |
| ASSERT_EQ( |
| 5u, |
| pw_varint_CallEncode( |
| std::numeric_limits<uint32_t>::max() - 1, buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::memcmp("\xfe\xff\xff\xff\x0f", buffer_, 5), 0); |
| |
| ASSERT_EQ( |
| 5u, |
| pw_varint_CallEncode( |
| std::numeric_limits<uint32_t>::max(), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::memcmp("\xff\xff\xff\xff\x0f", buffer_, 5), 0); |
| } |
| |
| TEST_F(Varint, EncodeSizeSigned32_SmallSingleByte) { |
| ASSERT_EQ(1u, Encode(INT32_C(0), buffer_)); |
| EXPECT_EQ(std::byte{0}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(INT32_C(-1), buffer_)); |
| EXPECT_EQ(std::byte{1}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(INT32_C(1), buffer_)); |
| EXPECT_EQ(std::byte{2}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(INT32_C(-2), buffer_)); |
| EXPECT_EQ(std::byte{3}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(INT32_C(2), buffer_)); |
| EXPECT_EQ(std::byte{4}, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeSigned32_SmallSingleByte_C) { |
| ASSERT_EQ(1u, |
| pw_varint_CallZigZagEncode(INT32_C(0), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{0}, buffer_[0]); |
| ASSERT_EQ(1u, |
| pw_varint_CallZigZagEncode(INT32_C(-1), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{1}, buffer_[0]); |
| ASSERT_EQ(1u, |
| pw_varint_CallZigZagEncode(INT32_C(1), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{2}, buffer_[0]); |
| ASSERT_EQ(1u, |
| pw_varint_CallZigZagEncode(INT32_C(-2), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{3}, buffer_[0]); |
| ASSERT_EQ(1u, |
| pw_varint_CallZigZagEncode(INT32_C(2), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{4}, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeSigned32_LargeSingleByte) { |
| ASSERT_EQ(1u, Encode(INT32_C(-63), buffer_)); |
| EXPECT_EQ(std::byte{125}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(INT32_C(63), buffer_)); |
| EXPECT_EQ(std::byte{126}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(INT32_C(-64), buffer_)); |
| EXPECT_EQ(std::byte{127}, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeSigned32_LargeSingleByte_C) { |
| ASSERT_EQ(1u, |
| pw_varint_CallZigZagEncode(INT32_C(-63), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{125}, buffer_[0]); |
| ASSERT_EQ(1u, |
| pw_varint_CallZigZagEncode(INT32_C(63), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{126}, buffer_[0]); |
| ASSERT_EQ(1u, |
| pw_varint_CallZigZagEncode(INT32_C(-64), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{127}, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeSigned32_MultiByte) { |
| ASSERT_EQ(2u, Encode(INT32_C(64), buffer_)); |
| EXPECT_EQ(std::memcmp("\x80\x01", buffer_, 2), 0); |
| ASSERT_EQ(2u, Encode(INT32_C(-65), buffer_)); |
| EXPECT_EQ(std::memcmp("\x81\x01", buffer_, 2), 0); |
| ASSERT_EQ(2u, Encode(INT32_C(65), buffer_)); |
| EXPECT_EQ(std::memcmp("\x82\x01", buffer_, 2), 0); |
| |
| ASSERT_EQ(5u, Encode(std::numeric_limits<int32_t>::min(), buffer_)); |
| EXPECT_EQ(std::memcmp("\xff\xff\xff\xff\x0f", buffer_, 5), 0); |
| |
| ASSERT_EQ(5u, Encode(std::numeric_limits<int32_t>::max(), buffer_)); |
| EXPECT_EQ(std::memcmp("\xfe\xff\xff\xff\x0f", buffer_, 5), 0); |
| } |
| |
| TEST_F(Varint, EncodeSizeSigned32_MultiByte_C) { |
| ASSERT_EQ(2u, |
| pw_varint_CallZigZagEncode(INT32_C(64), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::memcmp("\x80\x01", buffer_, 2), 0); |
| ASSERT_EQ(2u, |
| pw_varint_CallZigZagEncode(INT32_C(-65), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::memcmp("\x81\x01", buffer_, 2), 0); |
| ASSERT_EQ(2u, |
| pw_varint_CallZigZagEncode(INT32_C(65), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::memcmp("\x82\x01", buffer_, 2), 0); |
| |
| ASSERT_EQ(5u, |
| pw_varint_CallZigZagEncode( |
| std::numeric_limits<int32_t>::min(), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::memcmp("\xff\xff\xff\xff\x0f", buffer_, 5), 0); |
| |
| ASSERT_EQ(5u, |
| pw_varint_CallZigZagEncode( |
| std::numeric_limits<int32_t>::max(), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::memcmp("\xfe\xff\xff\xff\x0f", buffer_, 5), 0); |
| } |
| |
| TEST_F(Varint, EncodeSizeUnsigned64_SmallSingleByte) { |
| ASSERT_EQ(1u, Encode(UINT64_C(0), buffer_)); |
| EXPECT_EQ(std::byte{0}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(UINT64_C(1), buffer_)); |
| EXPECT_EQ(std::byte{1}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(UINT64_C(2), buffer_)); |
| EXPECT_EQ(std::byte{2}, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeUnsigned64_SmallSingleByte_C) { |
| ASSERT_EQ(1u, pw_varint_CallEncode(UINT64_C(0), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{0}, buffer_[0]); |
| ASSERT_EQ(1u, pw_varint_CallEncode(UINT64_C(1), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{1}, buffer_[0]); |
| ASSERT_EQ(1u, pw_varint_CallEncode(UINT64_C(2), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{2}, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeUnsigned64_LargeSingleByte) { |
| ASSERT_EQ(1u, Encode(UINT64_C(63), buffer_)); |
| EXPECT_EQ(std::byte{63}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(UINT64_C(64), buffer_)); |
| EXPECT_EQ(std::byte{64}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(UINT64_C(126), buffer_)); |
| EXPECT_EQ(std::byte{126}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(UINT64_C(127), buffer_)); |
| EXPECT_EQ(std::byte{127}, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeUnsigned64_LargeSingleByte_C) { |
| ASSERT_EQ(1u, pw_varint_CallEncode(UINT64_C(63), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{63}, buffer_[0]); |
| ASSERT_EQ(1u, pw_varint_CallEncode(UINT64_C(64), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{64}, buffer_[0]); |
| ASSERT_EQ(1u, pw_varint_CallEncode(UINT64_C(126), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{126}, buffer_[0]); |
| ASSERT_EQ(1u, pw_varint_CallEncode(UINT64_C(127), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{127}, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeUnsigned64_MultiByte) { |
| ASSERT_EQ(2u, Encode(UINT64_C(128), buffer_)); |
| EXPECT_EQ(std::memcmp("\x80\x01", buffer_, 2), 0); |
| ASSERT_EQ(2u, Encode(UINT64_C(129), buffer_)); |
| EXPECT_EQ(std::memcmp("\x81\x01", buffer_, 2), 0); |
| |
| ASSERT_EQ(5u, Encode(std::numeric_limits<uint32_t>::max() - 1, buffer_)); |
| EXPECT_EQ(std::memcmp("\xfe\xff\xff\xff\x0f", buffer_, 5), 0); |
| |
| ASSERT_EQ(5u, Encode(std::numeric_limits<uint32_t>::max(), buffer_)); |
| EXPECT_EQ(std::memcmp("\xff\xff\xff\xff\x0f", buffer_, 5), 0); |
| |
| ASSERT_EQ(10u, Encode(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, Encode(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, EncodeSizeUnsigned64_MultiByte_C) { |
| ASSERT_EQ(2u, pw_varint_CallEncode(UINT64_C(128), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::memcmp("\x80\x01", buffer_, 2), 0); |
| ASSERT_EQ(2u, pw_varint_CallEncode(UINT64_C(129), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::memcmp("\x81\x01", buffer_, 2), 0); |
| |
| ASSERT_EQ( |
| 5u, |
| pw_varint_CallEncode( |
| std::numeric_limits<uint32_t>::max() - 1, buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::memcmp("\xfe\xff\xff\xff\x0f", buffer_, 5), 0); |
| |
| ASSERT_EQ( |
| 5u, |
| pw_varint_CallEncode( |
| std::numeric_limits<uint32_t>::max(), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::memcmp("\xff\xff\xff\xff\x0f", buffer_, 5), 0); |
| |
| ASSERT_EQ( |
| 10u, |
| pw_varint_CallEncode( |
| std::numeric_limits<uint64_t>::max() - 1, buffer_, sizeof(buffer_))); |
| EXPECT_EQ( |
| std::memcmp("\xfe\xff\xff\xff\xff\xff\xff\xff\xff\x01", buffer_, 10), 0); |
| |
| ASSERT_EQ( |
| 10u, |
| pw_varint_CallEncode( |
| std::numeric_limits<uint64_t>::max(), buffer_, sizeof(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, Encode(INT64_C(0), buffer_)); |
| EXPECT_EQ(std::byte{0}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(INT64_C(-1), buffer_)); |
| EXPECT_EQ(std::byte{1}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(INT64_C(1), buffer_)); |
| EXPECT_EQ(std::byte{2}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(INT64_C(-2), buffer_)); |
| EXPECT_EQ(std::byte{3}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(INT64_C(2), buffer_)); |
| EXPECT_EQ(std::byte{4}, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeSigned64_SmallSingleByte_C) { |
| ASSERT_EQ(1u, |
| pw_varint_CallZigZagEncode(INT64_C(0), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{0}, buffer_[0]); |
| ASSERT_EQ(1u, |
| pw_varint_CallZigZagEncode(INT64_C(-1), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{1}, buffer_[0]); |
| ASSERT_EQ(1u, |
| pw_varint_CallZigZagEncode(INT64_C(1), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{2}, buffer_[0]); |
| ASSERT_EQ(1u, |
| pw_varint_CallZigZagEncode(INT64_C(-2), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{3}, buffer_[0]); |
| ASSERT_EQ(1u, |
| pw_varint_CallZigZagEncode(INT64_C(2), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{4}, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeSigned64_LargeSingleByte) { |
| ASSERT_EQ(1u, Encode(INT64_C(-63), buffer_)); |
| EXPECT_EQ(std::byte{125}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(INT64_C(63), buffer_)); |
| EXPECT_EQ(std::byte{126}, buffer_[0]); |
| ASSERT_EQ(1u, Encode(INT64_C(-64), buffer_)); |
| EXPECT_EQ(std::byte{127}, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeSigned64_LargeSingleByte_C) { |
| ASSERT_EQ(1u, |
| pw_varint_CallZigZagEncode(INT64_C(-63), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{125}, buffer_[0]); |
| ASSERT_EQ(1u, |
| pw_varint_CallZigZagEncode(INT64_C(63), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{126}, buffer_[0]); |
| ASSERT_EQ(1u, |
| pw_varint_CallZigZagEncode(INT64_C(-64), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::byte{127}, buffer_[0]); |
| } |
| |
| TEST_F(Varint, EncodeSizeSigned64_MultiByte) { |
| ASSERT_EQ(2u, Encode(INT64_C(64), buffer_)); |
| EXPECT_EQ(std::memcmp("\x80\x01", buffer_, 2), 0); |
| ASSERT_EQ(2u, Encode(INT64_C(-65), buffer_)); |
| EXPECT_EQ(std::memcmp("\x81\x01", buffer_, 2), 0); |
| ASSERT_EQ(2u, Encode(INT64_C(65), buffer_)); |
| EXPECT_EQ(std::memcmp("\x82\x01", buffer_, 2), 0); |
| |
| ASSERT_EQ(5u, |
| Encode(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, |
| Encode(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, Encode(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, Encode(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, EncodeSizeSigned64_MultiByte_C) { |
| ASSERT_EQ(2u, |
| pw_varint_CallZigZagEncode(INT64_C(64), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::memcmp("\x80\x01", buffer_, 2), 0); |
| ASSERT_EQ(2u, |
| pw_varint_CallZigZagEncode(INT64_C(-65), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::memcmp("\x81\x01", buffer_, 2), 0); |
| ASSERT_EQ(2u, |
| pw_varint_CallZigZagEncode(INT64_C(65), buffer_, sizeof(buffer_))); |
| EXPECT_EQ(std::memcmp("\x82\x01", buffer_, 2), 0); |
| |
| ASSERT_EQ(5u, |
| pw_varint_CallZigZagEncode( |
| static_cast<int64_t>(std::numeric_limits<int32_t>::min()), |
| buffer_, |
| sizeof(buffer_))); |
| EXPECT_EQ(std::memcmp("\xff\xff\xff\xff\x0f", buffer_, 5), 0); |
| |
| ASSERT_EQ(5u, |
| pw_varint_CallZigZagEncode( |
| static_cast<int64_t>(std::numeric_limits<int32_t>::max()), |
| buffer_, |
| sizeof(buffer_))); |
| EXPECT_EQ(std::memcmp("\xfe\xff\xff\xff\x0f", buffer_, 5), 0); |
| |
| ASSERT_EQ(10u, |
| pw_varint_CallZigZagEncode( |
| std::numeric_limits<int64_t>::min(), buffer_, sizeof(buffer_))); |
| EXPECT_EQ( |
| std::memcmp("\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01", buffer_, 10), 0); |
| |
| ASSERT_EQ(10u, |
| pw_varint_CallZigZagEncode( |
| std::numeric_limits<int64_t>::max(), buffer_, sizeof(buffer_))); |
| EXPECT_EQ( |
| std::memcmp("\xfe\xff\xff\xff\xff\xff\xff\xff\xff\x01", buffer_, 10), 0); |
| } |
| |
| // How much to increment by for each iteration of the exhaustive encode/decode |
| // tests. Set the increment to 1 to test every number (this is slow). |
| constexpr int kIncrement = 100'000'009; |
| |
| TEST_F(Varint, EncodeDecodeSigned32) { |
| int32_t i = std::numeric_limits<int32_t>::min(); |
| while (true) { |
| size_t encoded = Encode(i, buffer_); |
| |
| int64_t result; |
| size_t decoded = Decode(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, EncodeDecodeSigned32_C) { |
| int32_t i = std::numeric_limits<int32_t>::min(); |
| while (true) { |
| size_t encoded = pw_varint_CallZigZagEncode(i, buffer_, sizeof(buffer_)); |
| |
| int64_t result; |
| size_t decoded = |
| pw_varint_CallZigZagDecode(buffer_, sizeof(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) { |
| uint32_t i = 0; |
| while (true) { |
| size_t encoded = Encode(i, buffer_); |
| |
| uint64_t result; |
| size_t decoded = Decode(buffer_, &result); |
| |
| EXPECT_EQ(encoded, decoded); |
| ASSERT_EQ(i, result); |
| |
| if (i > std::numeric_limits<uint32_t>::max() - kIncrement) { |
| break; |
| } |
| |
| i += kIncrement; |
| } |
| } |
| |
| TEST_F(Varint, EncodeDecodeUnsigned32_C) { |
| uint32_t i = 0; |
| while (true) { |
| size_t encoded = pw_varint_CallEncode(i, buffer_, sizeof(buffer_)); |
| |
| uint64_t result; |
| size_t decoded = pw_varint_CallDecode(buffer_, sizeof(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<std::byte, kSizeBytes> array; |
| std::memcpy(array.data(), data, kSizeBytes); |
| return array; |
| } |
| |
| TEST(VarintDecode, DecodeSigned64_SingleByte) { |
| int64_t value = -1234; |
| |
| EXPECT_EQ(Decode(MakeBuffer("\x00"), &value), 1u); |
| EXPECT_EQ(value, 0); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\x01"), &value), 1u); |
| EXPECT_EQ(value, -1); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\x02"), &value), 1u); |
| EXPECT_EQ(value, 1); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\x03"), &value), 1u); |
| EXPECT_EQ(value, -2); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\x04"), &value), 1u); |
| EXPECT_EQ(value, 2); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\x04"), &value), 1u); |
| EXPECT_EQ(value, 2); |
| } |
| |
| TEST(VarintDecode, DecodeSigned64_SingleByte_C) { |
| int64_t value = -1234; |
| |
| auto buffer = MakeBuffer("\x00"); |
| EXPECT_EQ(pw_varint_CallZigZagDecode(buffer.data(), buffer.size(), &value), |
| 1u); |
| EXPECT_EQ(value, 0); |
| |
| buffer = MakeBuffer("\x01"); |
| EXPECT_EQ(pw_varint_CallZigZagDecode(buffer.data(), buffer.size(), &value), |
| 1u); |
| EXPECT_EQ(value, -1); |
| |
| buffer = MakeBuffer("\x02"); |
| EXPECT_EQ(pw_varint_CallZigZagDecode(buffer.data(), buffer.size(), &value), |
| 1u); |
| EXPECT_EQ(value, 1); |
| |
| buffer = MakeBuffer("\x03"); |
| EXPECT_EQ(pw_varint_CallZigZagDecode(buffer.data(), buffer.size(), &value), |
| 1u); |
| EXPECT_EQ(value, -2); |
| |
| buffer = MakeBuffer("\x04"); |
| EXPECT_EQ(pw_varint_CallZigZagDecode(buffer.data(), buffer.size(), &value), |
| 1u); |
| EXPECT_EQ(value, 2); |
| |
| buffer = MakeBuffer("\x04"); |
| EXPECT_EQ(pw_varint_CallZigZagDecode(buffer.data(), buffer.size(), &value), |
| 1u); |
| EXPECT_EQ(value, 2); |
| } |
| |
| TEST(VarintDecode, DecodeSigned64_MultiByte) { |
| int64_t value = -1234; |
| |
| EXPECT_EQ(Decode(MakeBuffer("\x80\x01"), &value), 2u); |
| EXPECT_EQ(value, 64); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\x81\x01"), &value), 2u); |
| EXPECT_EQ(value, -65); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\x82\x01"), &value), 2u); |
| EXPECT_EQ(value, 65); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\xff\xff\xff\xff\x0f"), &value), 5u); |
| EXPECT_EQ(value, std::numeric_limits<int32_t>::min()); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\xfe\xff\xff\xff\x0f"), &value), 5u); |
| EXPECT_EQ(value, std::numeric_limits<int32_t>::max()); |
| |
| EXPECT_EQ( |
| Decode(MakeBuffer("\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01"), &value), |
| 10u); |
| EXPECT_EQ(value, std::numeric_limits<int64_t>::min()); |
| |
| EXPECT_EQ( |
| Decode(MakeBuffer("\xfe\xff\xff\xff\xff\xff\xff\xff\xff\x01"), &value), |
| 10u); |
| EXPECT_EQ(value, std::numeric_limits<int64_t>::max()); |
| } |
| |
| TEST(VarintDecode, DecodeSigned64_MultiByte_C) { |
| int64_t value = -1234; |
| |
| auto buffer2 = MakeBuffer("\x80\x01"); |
| EXPECT_EQ(pw_varint_CallZigZagDecode(buffer2.data(), buffer2.size(), &value), |
| 2u); |
| EXPECT_EQ(value, 64); |
| |
| buffer2 = MakeBuffer("\x81\x01"); |
| EXPECT_EQ(pw_varint_CallZigZagDecode(buffer2.data(), buffer2.size(), &value), |
| 2u); |
| EXPECT_EQ(value, -65); |
| |
| buffer2 = MakeBuffer("\x82\x01"); |
| EXPECT_EQ(pw_varint_CallZigZagDecode(buffer2.data(), buffer2.size(), &value), |
| 2u); |
| EXPECT_EQ(value, 65); |
| |
| auto buffer4 = MakeBuffer("\xff\xff\xff\xff\x0f"); |
| EXPECT_EQ(pw_varint_CallZigZagDecode(buffer4.data(), buffer4.size(), &value), |
| 5u); |
| EXPECT_EQ(value, std::numeric_limits<int32_t>::min()); |
| |
| buffer4 = MakeBuffer("\xfe\xff\xff\xff\x0f"); |
| EXPECT_EQ(pw_varint_CallZigZagDecode(buffer4.data(), buffer4.size(), &value), |
| 5u); |
| EXPECT_EQ(value, std::numeric_limits<int32_t>::max()); |
| |
| auto buffer8 = MakeBuffer("\xff\xff\xff\xff\xff\xff\xff\xff\xff\x01"); |
| EXPECT_EQ(pw_varint_CallZigZagDecode(buffer8.data(), buffer8.size(), &value), |
| 10u); |
| EXPECT_EQ(value, std::numeric_limits<int64_t>::min()); |
| |
| buffer8 = MakeBuffer("\xfe\xff\xff\xff\xff\xff\xff\xff\xff\x01"); |
| EXPECT_EQ(pw_varint_CallZigZagDecode(buffer8.data(), buffer8.size(), &value), |
| 10u); |
| EXPECT_EQ(value, std::numeric_limits<int64_t>::max()); |
| } |
| |
| TEST(Varint, ZigZagEncode_Int8) { |
| EXPECT_EQ(ZigZagEncode(int8_t(0)), uint8_t(0)); |
| EXPECT_EQ(ZigZagEncode(int8_t(-1)), uint8_t(1)); |
| EXPECT_EQ(ZigZagEncode(int8_t(1)), uint8_t(2)); |
| EXPECT_EQ(ZigZagEncode(int8_t(-2)), uint8_t(3)); |
| EXPECT_EQ(ZigZagEncode(int8_t(2)), uint8_t(4)); |
| EXPECT_EQ(ZigZagEncode(int8_t(-33)), uint8_t(65)); |
| EXPECT_EQ(ZigZagEncode(int8_t(33)), uint8_t(66)); |
| EXPECT_EQ(ZigZagEncode(std::numeric_limits<int8_t>::min()), |
| std::numeric_limits<uint8_t>::max()); |
| EXPECT_EQ(ZigZagEncode(std::numeric_limits<int8_t>::max()), |
| std::numeric_limits<uint8_t>::max() - 1u); |
| } |
| |
| TEST(Varint, ZigZagEncode_Int16) { |
| EXPECT_EQ(ZigZagEncode(int16_t(0)), uint16_t(0)); |
| EXPECT_EQ(ZigZagEncode(int16_t(-1)), uint16_t(1)); |
| EXPECT_EQ(ZigZagEncode(int16_t(1)), uint16_t(2)); |
| EXPECT_EQ(ZigZagEncode(int16_t(-2)), uint16_t(3)); |
| EXPECT_EQ(ZigZagEncode(int16_t(2)), uint16_t(4)); |
| EXPECT_EQ(ZigZagEncode(int16_t(-3333)), uint16_t(6665)); |
| EXPECT_EQ(ZigZagEncode(int16_t(3333)), uint16_t(6666)); |
| EXPECT_EQ(ZigZagEncode(std::numeric_limits<int16_t>::min()), |
| std::numeric_limits<uint16_t>::max()); |
| EXPECT_EQ(ZigZagEncode(std::numeric_limits<int16_t>::max()), |
| std::numeric_limits<uint16_t>::max() - 1u); |
| } |
| |
| TEST(Varint, ZigZagEncode_Int32) { |
| EXPECT_EQ(ZigZagEncode(int32_t(0)), uint32_t(0)); |
| EXPECT_EQ(ZigZagEncode(int32_t(-1)), uint32_t(1)); |
| EXPECT_EQ(ZigZagEncode(int32_t(1)), uint32_t(2)); |
| EXPECT_EQ(ZigZagEncode(int32_t(-2)), uint32_t(3)); |
| EXPECT_EQ(ZigZagEncode(int32_t(2)), uint32_t(4)); |
| EXPECT_EQ(ZigZagEncode(int32_t(-128)), uint32_t(255)); |
| EXPECT_EQ(ZigZagEncode(int32_t(128)), uint32_t(256)); |
| EXPECT_EQ(ZigZagEncode(int32_t(-333333)), uint32_t(666665)); |
| EXPECT_EQ(ZigZagEncode(int32_t(333333)), uint32_t(666666)); |
| EXPECT_EQ(ZigZagEncode(std::numeric_limits<int32_t>::min()), |
| std::numeric_limits<uint32_t>::max()); |
| EXPECT_EQ(ZigZagEncode(std::numeric_limits<int32_t>::max()), |
| std::numeric_limits<uint32_t>::max() - 1u); |
| } |
| |
| TEST(Varint, ZigZagEncode_Int64) { |
| EXPECT_EQ(ZigZagEncode(int64_t(0)), uint64_t(0)); |
| EXPECT_EQ(ZigZagEncode(int64_t(-1)), uint64_t(1)); |
| EXPECT_EQ(ZigZagEncode(int64_t(1)), uint64_t(2)); |
| EXPECT_EQ(ZigZagEncode(int64_t(-2)), uint64_t(3)); |
| EXPECT_EQ(ZigZagEncode(int64_t(2)), uint64_t(4)); |
| EXPECT_EQ(ZigZagEncode(int64_t(-3333333333)), uint64_t(6666666665)); |
| EXPECT_EQ(ZigZagEncode(int64_t(3333333333)), uint64_t(6666666666)); |
| EXPECT_EQ(ZigZagEncode(std::numeric_limits<int64_t>::min()), |
| std::numeric_limits<uint64_t>::max()); |
| EXPECT_EQ(ZigZagEncode(std::numeric_limits<int64_t>::max()), |
| std::numeric_limits<uint64_t>::max() - 1u); |
| } |
| |
| TEST(Varint, ZigZagDecode_Int8) { |
| EXPECT_EQ(ZigZagDecode(uint8_t(0)), int8_t(0)); |
| EXPECT_EQ(ZigZagDecode(uint8_t(1)), int8_t(-1)); |
| EXPECT_EQ(ZigZagDecode(uint8_t(2)), int8_t(1)); |
| EXPECT_EQ(ZigZagDecode(uint8_t(3)), int8_t(-2)); |
| EXPECT_EQ(ZigZagDecode(uint8_t(4)), int8_t(2)); |
| EXPECT_EQ(ZigZagDecode(uint8_t(65)), int8_t(-33)); |
| EXPECT_EQ(ZigZagDecode(uint8_t(66)), int8_t(33)); |
| EXPECT_EQ(ZigZagDecode(std::numeric_limits<uint8_t>::max()), |
| std::numeric_limits<int8_t>::min()); |
| EXPECT_EQ(ZigZagDecode(std::numeric_limits<uint8_t>::max() - 1u), |
| std::numeric_limits<int8_t>::max()); |
| } |
| |
| TEST(Varint, ZigZagDecode_Int16) { |
| EXPECT_EQ(ZigZagDecode(uint16_t(0)), int16_t(0)); |
| EXPECT_EQ(ZigZagDecode(uint16_t(1)), int16_t(-1)); |
| EXPECT_EQ(ZigZagDecode(uint16_t(2)), int16_t(1)); |
| EXPECT_EQ(ZigZagDecode(uint16_t(3)), int16_t(-2)); |
| EXPECT_EQ(ZigZagDecode(uint16_t(4)), int16_t(2)); |
| EXPECT_EQ(ZigZagDecode(uint16_t(6665)), int16_t(-3333)); |
| EXPECT_EQ(ZigZagDecode(uint16_t(6666)), int16_t(3333)); |
| EXPECT_EQ(ZigZagDecode(std::numeric_limits<uint16_t>::max()), |
| std::numeric_limits<int16_t>::min()); |
| EXPECT_EQ(ZigZagDecode(std::numeric_limits<uint16_t>::max() - 1u), |
| std::numeric_limits<int16_t>::max()); |
| } |
| |
| TEST(Varint, ZigZagDecode_Int32) { |
| EXPECT_EQ(ZigZagDecode(uint32_t(0)), int32_t(0)); |
| EXPECT_EQ(ZigZagDecode(uint32_t(1)), int32_t(-1)); |
| EXPECT_EQ(ZigZagDecode(uint32_t(2)), int32_t(1)); |
| EXPECT_EQ(ZigZagDecode(uint32_t(3)), int32_t(-2)); |
| EXPECT_EQ(ZigZagDecode(uint32_t(4)), int32_t(2)); |
| EXPECT_EQ(ZigZagDecode(uint32_t(255)), int32_t(-128)); |
| EXPECT_EQ(ZigZagDecode(uint32_t(256)), int32_t(128)); |
| EXPECT_EQ(ZigZagDecode(uint32_t(666665)), int32_t(-333333)); |
| EXPECT_EQ(ZigZagDecode(uint32_t(666666)), int32_t(333333)); |
| EXPECT_EQ(ZigZagDecode(std::numeric_limits<uint32_t>::max()), |
| std::numeric_limits<int32_t>::min()); |
| EXPECT_EQ(ZigZagDecode(std::numeric_limits<uint32_t>::max() - 1u), |
| std::numeric_limits<int32_t>::max()); |
| } |
| |
| TEST(Varint, ZigZagDecode_Int64) { |
| EXPECT_EQ(ZigZagDecode(uint64_t(0)), int64_t(0)); |
| EXPECT_EQ(ZigZagDecode(uint64_t(1)), int64_t(-1)); |
| EXPECT_EQ(ZigZagDecode(uint64_t(2)), int64_t(1)); |
| EXPECT_EQ(ZigZagDecode(uint64_t(3)), int64_t(-2)); |
| EXPECT_EQ(ZigZagDecode(uint64_t(4)), int64_t(2)); |
| EXPECT_EQ(ZigZagDecode(uint64_t(6666666665)), int64_t(-3333333333)); |
| EXPECT_EQ(ZigZagDecode(uint64_t(6666666666)), int64_t(3333333333)); |
| EXPECT_EQ(ZigZagDecode(std::numeric_limits<uint64_t>::max()), |
| std::numeric_limits<int64_t>::min()); |
| EXPECT_EQ(ZigZagDecode(std::numeric_limits<uint64_t>::max() - 1llu), |
| std::numeric_limits<int64_t>::max()); |
| } |
| |
| TEST(Varint, ZigZagEncodeDecode) { |
| EXPECT_EQ(ZigZagDecode(ZigZagEncode(0)), 0); |
| EXPECT_EQ(ZigZagDecode(ZigZagEncode(1)), 1); |
| EXPECT_EQ(ZigZagDecode(ZigZagEncode(-1)), -1); |
| EXPECT_EQ(ZigZagDecode(ZigZagEncode(8675309)), 8675309); |
| EXPECT_EQ(ZigZagDecode(ZigZagEncode(std::numeric_limits<int8_t>::min())), |
| std::numeric_limits<int8_t>::min()); |
| EXPECT_EQ(ZigZagDecode(ZigZagEncode(std::numeric_limits<int8_t>::max())), |
| std::numeric_limits<int8_t>::max()); |
| EXPECT_EQ(ZigZagDecode(ZigZagEncode(std::numeric_limits<int16_t>::min())), |
| std::numeric_limits<int16_t>::min()); |
| EXPECT_EQ(ZigZagDecode(ZigZagEncode(std::numeric_limits<int16_t>::max())), |
| std::numeric_limits<int16_t>::max()); |
| EXPECT_EQ(ZigZagDecode(ZigZagEncode(std::numeric_limits<int32_t>::min())), |
| std::numeric_limits<int32_t>::min()); |
| EXPECT_EQ(ZigZagDecode(ZigZagEncode(std::numeric_limits<int32_t>::max())), |
| std::numeric_limits<int32_t>::max()); |
| EXPECT_EQ(ZigZagDecode(ZigZagEncode(std::numeric_limits<int64_t>::min())), |
| std::numeric_limits<int64_t>::min()); |
| EXPECT_EQ(ZigZagDecode(ZigZagEncode(std::numeric_limits<int64_t>::max())), |
| std::numeric_limits<int64_t>::max()); |
| } |
| |
| TEST_F(Varint, EncodeWithOptions_SingleByte) { |
| ASSERT_EQ(Encode(0u, buffer_, Format::kZeroTerminatedLeastSignificant), 1u); |
| EXPECT_EQ(buffer_[0], std::byte{0x00}); |
| |
| ASSERT_EQ(Encode(1u, buffer_, Format::kZeroTerminatedLeastSignificant), 1u); |
| EXPECT_EQ(buffer_[0], std::byte{0x02}); |
| |
| ASSERT_EQ(Encode(0x7f, buffer_, Format::kZeroTerminatedLeastSignificant), 1u); |
| EXPECT_EQ(buffer_[0], std::byte{0xfe}); |
| |
| ASSERT_EQ(Encode(0u, buffer_, Format::kOneTerminatedLeastSignificant), 1u); |
| EXPECT_EQ(buffer_[0], std::byte{0x01}); |
| |
| ASSERT_EQ(Encode(2u, buffer_, Format::kOneTerminatedLeastSignificant), 1u); |
| EXPECT_EQ(buffer_[0], std::byte{0x05}); |
| |
| ASSERT_EQ(Encode(0x7f, buffer_, Format::kOneTerminatedLeastSignificant), 1u); |
| EXPECT_EQ(buffer_[0], std::byte{0xff}); |
| |
| ASSERT_EQ(Encode(0u, buffer_, Format::kZeroTerminatedMostSignificant), 1u); |
| EXPECT_EQ(buffer_[0], std::byte{0x00}); |
| |
| ASSERT_EQ(Encode(7u, buffer_, Format::kZeroTerminatedMostSignificant), 1u); |
| EXPECT_EQ(buffer_[0], std::byte{0x07}); |
| |
| ASSERT_EQ(Encode(0x7f, buffer_, Format::kZeroTerminatedMostSignificant), 1u); |
| EXPECT_EQ(buffer_[0], std::byte{0x7f}); |
| |
| ASSERT_EQ(Encode(0u, buffer_, Format::kOneTerminatedMostSignificant), 1u); |
| EXPECT_EQ(buffer_[0], std::byte{0x80}); |
| |
| ASSERT_EQ(Encode(15u, buffer_, Format::kOneTerminatedMostSignificant), 1u); |
| EXPECT_EQ(buffer_[0], std::byte{0x8f}); |
| |
| ASSERT_EQ(Encode(0x7f, buffer_, Format::kOneTerminatedMostSignificant), 1u); |
| EXPECT_EQ(buffer_[0], std::byte{0xff}); |
| } |
| |
| TEST_F(Varint, EncodeWithOptions_MultiByte) { |
| ASSERT_EQ(Encode(128u, buffer_, Format::kZeroTerminatedLeastSignificant), 2u); |
| EXPECT_EQ(std::memcmp("\x01\x02", buffer_, 2), 0); |
| |
| ASSERT_EQ( |
| Encode(0xffffffff, buffer_, Format::kZeroTerminatedLeastSignificant), 5u); |
| EXPECT_EQ(std::memcmp("\xff\xff\xff\xff\x1e", buffer_, 5), 0); |
| |
| ASSERT_EQ(Encode(128u, buffer_, Format::kOneTerminatedLeastSignificant), 2u); |
| EXPECT_EQ(std::memcmp("\x00\x03", buffer_, 2), 0); |
| |
| ASSERT_EQ(Encode(0xffffffff, buffer_, Format::kOneTerminatedLeastSignificant), |
| 5u); |
| EXPECT_EQ(std::memcmp("\xfe\xfe\xfe\xfe\x1f", buffer_, 5), 0); |
| |
| ASSERT_EQ(Encode(128u, buffer_, Format::kZeroTerminatedMostSignificant), 2u); |
| EXPECT_EQ(std::memcmp("\x80\x01", buffer_, 2), 0); |
| |
| ASSERT_EQ(Encode(0xffffffff, buffer_, Format::kZeroTerminatedMostSignificant), |
| 5u); |
| EXPECT_EQ(std::memcmp("\xff\xff\xff\xff\x0f", buffer_, 5), 0); |
| |
| ASSERT_EQ(Encode(128u, buffer_, Format::kOneTerminatedMostSignificant), 2u); |
| EXPECT_EQ(std::memcmp("\x00\x81", buffer_, 2), 0); |
| |
| ASSERT_EQ(Encode(0xffffffff, buffer_, Format::kOneTerminatedMostSignificant), |
| 5u); |
| EXPECT_EQ(std::memcmp("\x7f\x7f\x7f\x7f\x8f", buffer_, 5), 0); |
| } |
| |
| TEST(Varint, DecodeWithOptions_SingleByte) { |
| uint64_t value = -1234; |
| |
| EXPECT_EQ( |
| Decode( |
| MakeBuffer("\x00"), &value, Format::kZeroTerminatedLeastSignificant), |
| 1u); |
| EXPECT_EQ(value, 0u); |
| |
| EXPECT_EQ( |
| Decode( |
| MakeBuffer("\x04"), &value, Format::kZeroTerminatedLeastSignificant), |
| 1u); |
| EXPECT_EQ(value, 2u); |
| |
| EXPECT_EQ( |
| Decode( |
| MakeBuffer("\xaa"), &value, Format::kZeroTerminatedLeastSignificant), |
| 1u); |
| EXPECT_EQ(value, 85u); |
| |
| EXPECT_EQ( |
| Decode( |
| MakeBuffer("\x01"), &value, Format::kZeroTerminatedLeastSignificant), |
| 0u); |
| |
| EXPECT_EQ( |
| Decode( |
| MakeBuffer("\x01"), &value, Format::kOneTerminatedLeastSignificant), |
| 1u); |
| EXPECT_EQ(value, 0u); |
| |
| EXPECT_EQ( |
| Decode( |
| MakeBuffer("\x13"), &value, Format::kOneTerminatedLeastSignificant), |
| 1u); |
| EXPECT_EQ(value, 9u); |
| |
| EXPECT_EQ( |
| Decode( |
| MakeBuffer("\x00"), &value, Format::kOneTerminatedLeastSignificant), |
| 0u); |
| |
| EXPECT_EQ( |
| Decode( |
| MakeBuffer("\x00"), &value, Format::kZeroTerminatedMostSignificant), |
| 1u); |
| EXPECT_EQ(value, 0u); |
| |
| EXPECT_EQ( |
| Decode( |
| MakeBuffer("\x04"), &value, Format::kZeroTerminatedMostSignificant), |
| 1u); |
| EXPECT_EQ(value, 4u); |
| |
| EXPECT_EQ( |
| Decode( |
| MakeBuffer("\xff"), &value, Format::kZeroTerminatedMostSignificant), |
| 0u); |
| |
| EXPECT_EQ( |
| Decode(MakeBuffer("\x80"), &value, Format::kOneTerminatedMostSignificant), |
| 1u); |
| EXPECT_EQ(value, 0u); |
| |
| EXPECT_EQ( |
| Decode(MakeBuffer("\x83"), &value, Format::kOneTerminatedMostSignificant), |
| 1u); |
| EXPECT_EQ(value, 3u); |
| |
| EXPECT_EQ( |
| Decode(MakeBuffer("\xaa"), &value, Format::kOneTerminatedMostSignificant), |
| 1u); |
| EXPECT_EQ(value, 42u); |
| |
| EXPECT_EQ( |
| Decode(MakeBuffer("\xff"), &value, Format::kOneTerminatedMostSignificant), |
| 1u); |
| EXPECT_EQ(value, 127u); |
| |
| EXPECT_EQ( |
| Decode(MakeBuffer("\x00"), &value, Format::kOneTerminatedMostSignificant), |
| 0u); |
| } |
| |
| TEST(Varint, DecodeWithOptions_MultiByte) { |
| uint64_t value = -1234; |
| |
| EXPECT_EQ(Decode(MakeBuffer("\x01\x10"), |
| &value, |
| Format::kZeroTerminatedLeastSignificant), |
| 2u); |
| EXPECT_EQ(value, 1024u); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\xff\xff\xff\xfe"), |
| &value, |
| Format::kZeroTerminatedLeastSignificant), |
| 4u); |
| EXPECT_EQ(value, 0x0fffffffu); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\x01\x01\x01\x01\x00"), |
| &value, |
| Format::kZeroTerminatedLeastSignificant), |
| 5u); |
| EXPECT_EQ(value, 0u); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\x82\x2d"), |
| &value, |
| Format::kOneTerminatedLeastSignificant), |
| 2u); |
| EXPECT_EQ(value, 2881u); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\xfe\xfe\xfe\xff"), |
| &value, |
| Format::kOneTerminatedLeastSignificant), |
| 4u); |
| EXPECT_EQ(value, 0x0fffffffu); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\x00\x00\x00\x00\x01"), |
| &value, |
| Format::kOneTerminatedLeastSignificant), |
| 5u); |
| EXPECT_EQ(value, 0u); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\x83\x6a"), |
| &value, |
| Format::kZeroTerminatedMostSignificant), |
| 2u); |
| EXPECT_EQ(value, 0b1101010'0000011u); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\xff\xff\xff\x7f"), |
| &value, |
| Format::kZeroTerminatedMostSignificant), |
| 4u); |
| EXPECT_EQ(value, 0x0fffffffu); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\x80\x80\x80\x80\x00"), |
| &value, |
| Format::kZeroTerminatedMostSignificant), |
| 5u); |
| EXPECT_EQ(value, 0u); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\x6a\x83"), |
| &value, |
| Format::kOneTerminatedMostSignificant), |
| 2u); |
| EXPECT_EQ(value, 0b0000011'1101010u); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\x7f\x7f\x7f\xff"), |
| &value, |
| Format::kOneTerminatedMostSignificant), |
| 4u); |
| EXPECT_EQ(value, 0x0fffffffu); |
| |
| EXPECT_EQ(Decode(MakeBuffer("\x00\x00\x00\x00\x80"), |
| &value, |
| Format::kOneTerminatedMostSignificant), |
| 5u); |
| EXPECT_EQ(value, 0u); |
| } |
| |
| TEST(Varint, EncodedSize) { |
| EXPECT_EQ(EncodedSize(uint64_t(0u)), 1u); |
| EXPECT_EQ(EncodedSize(uint64_t(1u)), 1u); |
| EXPECT_EQ(EncodedSize(uint64_t(127u)), 1u); |
| EXPECT_EQ(EncodedSize(uint64_t(128u)), 2u); |
| EXPECT_EQ(EncodedSize(uint64_t(16383u)), 2u); |
| EXPECT_EQ(EncodedSize(uint64_t(16384u)), 3u); |
| EXPECT_EQ(EncodedSize(uint64_t(2097151u)), 3u); |
| EXPECT_EQ(EncodedSize(uint64_t(2097152u)), 4u); |
| EXPECT_EQ(EncodedSize(uint64_t(268435455u)), 4u); |
| EXPECT_EQ(EncodedSize(uint64_t(268435456u)), 5u); |
| EXPECT_EQ(EncodedSize(uint64_t(34359738367u)), 5u); |
| EXPECT_EQ(EncodedSize(uint64_t(34359738368u)), 6u); |
| EXPECT_EQ(EncodedSize(uint64_t(4398046511103u)), 6u); |
| EXPECT_EQ(EncodedSize(uint64_t(4398046511104u)), 7u); |
| EXPECT_EQ(EncodedSize(uint64_t(562949953421311u)), 7u); |
| EXPECT_EQ(EncodedSize(uint64_t(562949953421312u)), 8u); |
| EXPECT_EQ(EncodedSize(uint64_t(72057594037927935u)), 8u); |
| EXPECT_EQ(EncodedSize(uint64_t(72057594037927936u)), 9u); |
| EXPECT_EQ(EncodedSize(uint64_t(9223372036854775807u)), 9u); |
| EXPECT_EQ(EncodedSize(uint64_t(9223372036854775808u)), 10u); |
| EXPECT_EQ(EncodedSize(std::numeric_limits<uint64_t>::max()), 10u); |
| EXPECT_EQ(EncodedSize(std::numeric_limits<int64_t>::max()), 9u); |
| EXPECT_EQ(EncodedSize(int64_t(-1)), 10u); |
| EXPECT_EQ(EncodedSize(std::numeric_limits<int64_t>::min()), 10u); |
| } |
| |
| TEST(Varint, ZigZagEncodedSize) { |
| EXPECT_EQ(ZigZagEncodedSize(int64_t(0)), 1u); |
| EXPECT_EQ(ZigZagEncodedSize(int64_t(-1)), 1u); |
| EXPECT_EQ(ZigZagEncodedSize(int64_t(1)), 1u); |
| EXPECT_EQ(ZigZagEncodedSize(int64_t(-64)), 1u); |
| EXPECT_EQ(ZigZagEncodedSize(int64_t(-65)), 2u); |
| EXPECT_EQ(ZigZagEncodedSize(int64_t(63)), 1u); |
| EXPECT_EQ(ZigZagEncodedSize(int64_t(64)), 2u); |
| EXPECT_EQ(ZigZagEncodedSize(std::numeric_limits<int8_t>::min()), 2u); |
| EXPECT_EQ(ZigZagEncodedSize(std::numeric_limits<int8_t>::max()), 2u); |
| EXPECT_EQ(ZigZagEncodedSize(std::numeric_limits<int16_t>::min()), 3u); |
| EXPECT_EQ(ZigZagEncodedSize(std::numeric_limits<int16_t>::max()), 3u); |
| EXPECT_EQ(ZigZagEncodedSize(std::numeric_limits<int32_t>::min()), 5u); |
| EXPECT_EQ(ZigZagEncodedSize(std::numeric_limits<int32_t>::max()), 5u); |
| EXPECT_EQ(ZigZagEncodedSize(std::numeric_limits<int64_t>::min()), 10u); |
| EXPECT_EQ(ZigZagEncodedSize(std::numeric_limits<int64_t>::max()), 10u); |
| } |
| |
| constexpr uint64_t CalculateMaxValueInBytes(size_t bytes) { |
| uint64_t value = 0; |
| for (size_t i = 0; i < bytes; ++i) { |
| value |= uint64_t(0x7f) << (7 * i); |
| } |
| return value; |
| } |
| |
| TEST(Varint, MaxValueInBytes) { |
| static_assert(MaxValueInBytes(0) == 0); |
| static_assert(MaxValueInBytes(1) == 0x7f); |
| static_assert(MaxValueInBytes(2) == 0x3fff); |
| static_assert(MaxValueInBytes(3) == 0x1fffff); |
| static_assert(MaxValueInBytes(4) == 0x0fffffff); |
| static_assert(MaxValueInBytes(5) == CalculateMaxValueInBytes(5)); |
| static_assert(MaxValueInBytes(6) == CalculateMaxValueInBytes(6)); |
| static_assert(MaxValueInBytes(7) == CalculateMaxValueInBytes(7)); |
| static_assert(MaxValueInBytes(8) == CalculateMaxValueInBytes(8)); |
| static_assert(MaxValueInBytes(9) == CalculateMaxValueInBytes(9)); |
| static_assert(MaxValueInBytes(10) == std::numeric_limits<uint64_t>::max()); |
| static_assert(MaxValueInBytes(11) == std::numeric_limits<uint64_t>::max()); |
| static_assert(MaxValueInBytes(100) == std::numeric_limits<uint64_t>::max()); |
| } |
| |
| } // namespace |
| } // namespace pw::varint |
