1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 // Utility functions for calculating and verifying checksums. 18 19 #ifndef LIBTEXTCLASSIFIER_UTILS_CHECKSUM_H_ 20 #define LIBTEXTCLASSIFIER_UTILS_CHECKSUM_H_ 21 22 #include <string> 23 24 namespace libtextclassifier3 { 25 26 // Computes and verifies that the last digit of `input` matches the Luhn 27 // checksum. Returns false if presented with non-digits, or on whitespace 28 // characters if `ignore_whitespace` is false. 29 bool VerifyLuhnChecksum(const std::string& input, 30 bool ignore_whitespace = true); 31 32 } // namespace libtextclassifier3 33 34 #endif // LIBTEXTCLASSIFIER_UTILS_CHECKSUM_H_ 35