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 #ifndef FTRACE_PARSE_HELPERS_H 16 #define FTRACE_PARSE_HELPERS_H 17 #include <string> 18 #include <vector> 19 #include "ftrace_common_type.h" 20 21 FTRACE_NS_BEGIN 22 using VoidPtr = std::unique_ptr<void>::pointer; 23 24 class FtraceFieldParser { 25 public: ParseIntField(const FieldFormat & format,uint8_t data[],size_t size)26 template <typename T> static T ParseIntField(const FieldFormat& format, uint8_t data[], size_t size) 27 { 28 static_assert(std::is_integral<T>::value, "Integral type T required."); 29 T retval = {}; 30 auto end = data + size; 31 auto start = data + format.offset; 32 ReadData(start, end, &retval, format.size); 33 return retval; 34 } 35 ParseVectorIntField(const std::vector<FieldFormat> & fields,size_t id,uint8_t data[],size_t size)36 template <typename T> static std::vector<T> ParseVectorIntField(const std::vector<FieldFormat>& fields, 37 size_t id, uint8_t data[], size_t size) 38 { 39 static_assert(std::is_integral<T>::value, "Integral type T required."); 40 if (fields.size() <= id) { 41 return {}; 42 } 43 44 FieldFormat format = fields[id]; 45 std::vector<T> retvalVec = {}; 46 size_t retvalSize = sizeof(unsigned long); 47 size_t count = format.size / retvalSize; 48 for (size_t i = 0; i < count; i++) { 49 auto start = data + format.offset + i * retvalSize; 50 auto end = start + retvalSize; 51 T retval = {}; 52 ReadData(start, end, &retval, retvalSize); 53 retvalVec.push_back(retval); 54 } 55 return retvalVec; 56 } 57 58 template <typename T> ParseIntField(const std::vector<FieldFormat> & fields,size_t id,uint8_t data[],size_t size)59 static T ParseIntField(const std::vector<FieldFormat>& fields, size_t id, uint8_t data[], size_t size) 60 { 61 static_assert(std::is_integral<T>::value, "Integral type T required."); 62 if (fields.size() > id) { 63 return ParseIntField<T>(fields[id], data, size); 64 } 65 return {}; 66 } 67 68 static std::string ParseStrField(const FieldFormat& format, uint8_t data[], size_t size); 69 ParseStrField(const std::vector<FieldFormat> & fields,size_t id,uint8_t data[],size_t size)70 static std::string ParseStrField(const std::vector<FieldFormat>& fields, size_t id, uint8_t data[], size_t size) 71 { 72 if (fields.size() > id) { 73 return ParseStrField(fields[id], data, size); 74 } 75 return ""; 76 } 77 78 private: 79 static bool ReadData(const uint8_t start[], const uint8_t end[], VoidPtr out, size_t size); 80 }; 81 FTRACE_NS_END 82 #endif 83