1 /* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 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 HISYSEVENT_STRING_FILTER_H 17 #define HISYSEVENT_STRING_FILTER_H 18 19 #include <string> 20 21 namespace OHOS { 22 namespace HiviewDFX { 23 class StringFilter { 24 public: 25 StringFilter(); ~StringFilter()26 ~StringFilter() {} 27 // Transform special char to escaped form ("lookup table" method) 28 std::string EscapeToRaw(const std::string &text); 29 // Check lexical ("finite state machine" method) 30 bool IsValidName(const std::string &text, unsigned int maxSize); 31 static StringFilter& GetInstance(); 32 33 private: 34 static constexpr int CHAR_RANGE = 128; 35 static constexpr int MAP_STR_LEN = 3; 36 37 static constexpr int STATE_NUM = 2; 38 static constexpr int STATE_BEGIN = 0; 39 static constexpr int STATE_RUN = 1; 40 static constexpr int STATE_STOP = -1; 41 42 static char charTab_[CHAR_RANGE][MAP_STR_LEN]; 43 static int statTab_[STATE_NUM][CHAR_RANGE]; 44 static StringFilter filter_; 45 }; 46 } // namespace HiviewDFX 47 } // namespace OHOS 48 49 #endif // HISYSEVENT_STRING_FILTER_H 50 51