| // Copyright 2021 Google LLC |
| // |
| // 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 |
| // |
| // http://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 "tink/internal/util.h" |
| |
| #include <string> |
| |
| #include "gmock/gmock.h" |
| #include "gtest/gtest.h" |
| #include "absl/strings/string_view.h" |
| |
| namespace crypto { |
| namespace tink { |
| namespace internal { |
| namespace { |
| |
| constexpr absl::string_view kLongString = |
| "a long buffer with \n several \n newlines"; |
| |
| TEST(UtilTest, EnsureStringNonNull) { |
| // Purposely create a string_view from nullptr. |
| auto null_str = absl::string_view(nullptr, 0); |
| EXPECT_EQ(EnsureStringNonNull(null_str), absl::string_view("")); |
| auto uninit_str = absl::string_view(); |
| EXPECT_EQ(EnsureStringNonNull(uninit_str), absl::string_view("")); |
| auto regular_str = absl::string_view("This is a non-empty non-null str"); |
| EXPECT_EQ(EnsureStringNonNull(regular_str), regular_str); |
| } |
| |
| TEST(BuffersOverlapTest, BufferOverlapEmpty) { |
| absl::string_view empty = ""; |
| EXPECT_FALSE(BuffersOverlap(empty, empty)); |
| EXPECT_FALSE(BuffersOverlap(empty, "")); |
| } |
| |
| TEST(BuffersOverlapTest, BufferOverlapSeparate) { |
| absl::string_view first = "first"; |
| absl::string_view second = "second"; |
| EXPECT_FALSE(BuffersOverlap(first, second)); |
| EXPECT_TRUE(BuffersOverlap(first, first)); |
| } |
| |
| TEST(BuffersOverlapTest, BufferOverlap) { |
| absl::string_view long_buffer = kLongString; |
| |
| EXPECT_TRUE(BuffersOverlap(long_buffer, long_buffer)); |
| |
| EXPECT_TRUE( |
| BuffersOverlap(long_buffer.substr(0, 10), long_buffer.substr(9, 5))); |
| EXPECT_FALSE( |
| BuffersOverlap(long_buffer.substr(0, 10), long_buffer.substr(10, 5))); |
| |
| EXPECT_TRUE( |
| BuffersOverlap(long_buffer.substr(9, 5), long_buffer.substr(0, 10))); |
| EXPECT_FALSE( |
| BuffersOverlap(long_buffer.substr(10, 5), long_buffer.substr(0, 10))); |
| } |
| |
| TEST(BuffersAreIdenticalTest, EmptyString) { |
| std::string empty_str = ""; |
| absl::string_view empty = ""; |
| EXPECT_FALSE(BuffersAreIdentical(empty, empty)); |
| EXPECT_FALSE(BuffersAreIdentical(absl::string_view(empty_str), |
| absl::string_view(empty_str))); |
| EXPECT_FALSE(BuffersAreIdentical(empty, "")); |
| EXPECT_FALSE(BuffersAreIdentical(empty, absl::string_view(empty_str))); |
| } |
| |
| TEST(BuffersAreIdenticalTest, BuffersAreIdentical) { |
| auto some_string = std::string(kLongString); |
| auto buffer = absl::string_view(some_string); |
| EXPECT_TRUE(BuffersAreIdentical(buffer, buffer)); |
| // Make sure BuffersAreIdentical is not checking for string equality. |
| std::string identical_string = some_string; |
| EXPECT_FALSE( |
| BuffersAreIdentical(buffer, absl::string_view(identical_string))); |
| } |
| |
| TEST(BuffersAreIdenticalTest, PartialOverlapFails) { |
| auto some_string = std::string(kLongString); |
| auto buffer = absl::string_view(some_string); |
| EXPECT_FALSE(BuffersAreIdentical(buffer.substr(0, 10), buffer.substr(9, 5))); |
| EXPECT_FALSE(BuffersAreIdentical(buffer.substr(0, 10), buffer.substr(10, 5))); |
| EXPECT_FALSE(BuffersAreIdentical(buffer.substr(9, 5), buffer.substr(0, 10))); |
| EXPECT_FALSE(BuffersAreIdentical(buffer.substr(10, 5), buffer.substr(0, 10))); |
| } |
| |
| } // namespace |
| } // namespace internal |
| } // namespace tink |
| } // namespace crypto |