| // Copyright 2020 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 |
| // |
| // https://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. |
| // |
| |
| // Utility functions for calculating and verifying checksums. |
| |
| #ifndef LIBTEXTCLASSIFIER_UTILS_CHECKSUM_H_ |
| #define LIBTEXTCLASSIFIER_UTILS_CHECKSUM_H_ |
| |
| #include <string> |
| |
| namespace libtextclassifier3 { |
| |
| // Computes and verifies that the last digit of `input` matches the Luhn |
| // checksum. Returns false if presented with non-digits, or on whitespace |
| // characters if `ignore_whitespace` is false. |
| bool VerifyLuhnChecksum(const std::string& input, |
| bool ignore_whitespace = true); |
| |
| } // namespace libtextclassifier3 |
| |
| #endif // LIBTEXTCLASSIFIER_UTILS_CHECKSUM_H_ |
