1 /** 2 * Copyright (c) 2021-2022 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 LIBPANDABASE_UTILS_UTILS_H 17 #define LIBPANDABASE_UTILS_UTILS_H 18 19 #include <exception> 20 #include <string> 21 22 namespace panda { 23 // ---------------------------------------------------------------------------- 24 // General helper functions 25 26 // Returns the value (0 .. 15) of a hexadecimal character c. 27 // If c is not a legal hexadecimal character, returns a value < 0. HexValue(uint32_t c)28inline uint32_t HexValue(uint32_t c) 29 { 30 constexpr uint32_t BASE16 = 16; 31 constexpr uint32_t BASE10 = 10; 32 constexpr uint32_t MASK = 0x20; 33 34 c -= '0'; 35 if (static_cast<unsigned>(c) < BASE10) { 36 return c; 37 } 38 // NOLINTNEXTLINE(hicpp-signed-bitwise) 39 c = (c | MASK) - ('a' - '0'); 40 if (static_cast<unsigned>(c) < (BASE16 - BASE10)) { 41 return c + BASE10; 42 } 43 return -1; 44 } 45 46 // General helper class 47 class UnreachableException : public std::exception { 48 public: UnreachableException(const char * msg)49 explicit UnreachableException(const char *msg) : msg_(msg) {} UnreachableException(const std::string_view & msg)50 explicit UnreachableException(const std::string_view &msg) : msg_(msg) {} what()51 const char *what() const noexcept override 52 { 53 return msg_.c_str(); 54 } 55 56 private: 57 std::string msg_; 58 }; 59 60 } // namespace panda 61 62 #endif // LIBPANDABASE_UTILS_UTILS_H 63