1 // Copyright 2021 Google LLC 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 // 15 /////////////////////////////////////////////////////////////////////////////// 16 #ifndef TINK_INTERNAL_UTIL_H_ 17 #define TINK_INTERNAL_UTIL_H_ 18 19 #include "absl/base/attributes.h" 20 #include "absl/strings/string_view.h" 21 22 namespace crypto { 23 namespace tink { 24 namespace internal { 25 26 // Return an empty string if str.data() is nullptr; otherwise return str. 27 absl::string_view EnsureStringNonNull(absl::string_view str); 28 29 // Returns true if `first` overlaps with `second`. 30 bool BuffersOverlap(absl::string_view first, absl::string_view second); 31 32 // Returns true if `first` fully overlaps with `second`. 33 bool BuffersAreIdentical(absl::string_view first, absl::string_view second); 34 35 // Returns true if `input` only contains printable ASCII characters (whitespace 36 // is not allowed). 37 bool IsPrintableAscii(absl::string_view input); 38 39 // Returns true if built on Windows; false otherwise. IsWindows()40inline bool IsWindows() { 41 #if defined(_WIN32) 42 return true; 43 #else 44 return false; 45 #endif 46 } 47 48 // Wraps Abseil's LOG(FATAL) macro and sets the [noreturn] attribute, which is 49 // useful for avoiding false positive [-Werror=return-type] compiler errors. 50 ABSL_ATTRIBUTE_NORETURN void LogFatal(absl::string_view msg); 51 52 } // namespace internal 53 } // namespace tink 54 } // namespace crypto 55 56 #endif // TINK_INTERNAL_UTIL_H_ 57