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// 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 {
using ::testing::IsFalse;
using ::testing::IsTrue;
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)));
}
TEST(UtilTest, IsPrintableAscii) {
const std::string input =
"!\"#$%&'()*+,-./"
"0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`"
"abcdefghijklmnopqrstuvwxyz{|}~";
EXPECT_THAT(IsPrintableAscii(input), IsTrue());
}
TEST(UtilTest, IsNotPrintableAscii) {
EXPECT_THAT(IsPrintableAscii("\n"), IsFalse());
EXPECT_THAT(IsPrintableAscii("\t"), IsFalse());
EXPECT_THAT(IsPrintableAscii(" "), IsFalse());
EXPECT_THAT(IsPrintableAscii(std::string("\x7f", 1)), IsFalse());
EXPECT_THAT(IsPrintableAscii("ö"), IsFalse());
}
} // namespace
} // namespace internal
} // namespace tink
} // namespace crypto
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