Function TestLEB128Encode

cpp/src/arrow/util/bit_util_test.cc:775–793

/// array
template <typename Int>
void TestLEB128Encode(Int input_value, const std::vector<uint8_t>& expected_data,
                      std::size_t buffer_size) {
  std::vector<uint8_t> buffer(buffer_size);
  auto bytes_written = bit_util::WriteLEB128(input_value, buffer.data(),
                                             static_cast<int32_t>(buffer.size()));

  EXPECT_EQ(bytes_written, expected_data.size());
  // Encoded data
  for (std::size_t i = 0; i < expected_data.size(); ++i) {
    EXPECT_EQ(buffer.at(i), expected_data.at(i));
  }

  // When the value is successfully encoded, the remaining of the buffer is untouched
  if (bytes_written > 0) {
    for (std::size_t i = bytes_written; i < buffer.size(); ++i) {
      EXPECT_EQ(buffer.at(i), 0);
    }
  }
}

/// Test encoding to known LEB128 byte sequences with edge cases parameters.
/// \see LEB128.KnownSuccessfulValues for other known values tested.