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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 <iterator>
#include <functional>
#include "absl/strings/ascii.h"
#include "absl/log/log.h"
#include "absl/strings/string_view.h"
namespace crypto {
namespace tink {
namespace internal {
absl::string_view EnsureStringNonNull(absl::string_view str) {
if (str.empty() && str.data() == nullptr) {
return absl::string_view("");
}
return str;
}
bool BuffersOverlap(absl::string_view first, absl::string_view second) {
// first begins within second's buffer.
bool first_begins_in_second =
std::less_equal<absl::string_view::const_iterator>{}(second.begin(),
first.begin()) &&
std::less<absl::string_view::const_iterator>{}(first.begin(),
second.end());
// second begins within first's buffer.
bool second_begins_in_first =
std::less_equal<absl::string_view::const_iterator>{}(first.begin(),
second.begin()) &&
std::less<absl::string_view::const_iterator>{}(second.begin(),
first.end());
return first_begins_in_second || second_begins_in_first;
}
bool BuffersAreIdentical(absl::string_view first, absl::string_view second) {
return !first.empty() && !second.empty() &&
std::equal_to<absl::string_view::const_iterator>{}(first.begin(),
second.begin()) &&
std::equal_to<absl::string_view::const_iterator>{}(
std::prev(first.end()), std::prev(second.end()));
}
bool IsPrintableAscii(absl::string_view input) {
for (char c : input) {
if (!absl::ascii_isprint(c) || absl::ascii_isspace(c)) {
return false;
}
}
return true;
}
void LogFatal(absl::string_view msg) {
LOG(FATAL) << msg;
}
} // namespace internal
} // namespace tink
} // namespace crypto
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