1 /* 2 * Copyright 2004 The WebRTC Project Authors. All rights reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include "webrtc/base/json.h" 12 13 #include <errno.h> 14 #include <limits.h> 15 #include <stdlib.h> 16 17 #include <sstream> 18 19 bool GetStringFromJson(const Json::Value& in, std::string* out) { 20 if (!in.isString()) { 21 std::ostringstream s; 22 if (in.isBool()) { 23 s << std::boolalpha << in.asBool(); 24 } else if (in.isInt()) { 25 s << in.asInt(); 26 } else if (in.isUInt()) { 27 s << in.asUInt(); 28 } else if (in.isDouble()) { 29 s << in.asDouble(); 30 } else { 31 return false; 32 } 33 *out = s.str(); 34 } else { 35 *out = in.asString(); 36 } 37 return true; 38 } 39 40 bool GetIntFromJson(const Json::Value& in, int* out) { 41 bool ret; 42 if (!in.isString()) { 43 ret = in.isConvertibleTo(Json::intValue); 44 if (ret) { 45 *out = in.asInt(); 46 } 47 } else { 48 long val; // NOLINT 49 const char* c_str = in.asCString(); 50 char* end_ptr; 51 errno = 0; 52 val = strtol(c_str, &end_ptr, 10); // NOLINT 53 ret = (end_ptr != c_str && *end_ptr == '\0' && !errno && 54 val >= INT_MIN && val <= INT_MAX); 55 *out = val; 56 } 57 return ret; 58 } 59 60 bool GetUIntFromJson(const Json::Value& in, unsigned int* out) { 61 bool ret; 62 if (!in.isString()) { 63 ret = in.isConvertibleTo(Json::uintValue); 64 if (ret) { 65 *out = in.asUInt(); 66 } 67 } else { 68 unsigned long val; // NOLINT 69 const char* c_str = in.asCString(); 70 char* end_ptr; 71 errno = 0; 72 val = strtoul(c_str, &end_ptr, 10); // NOLINT 73 ret = (end_ptr != c_str && *end_ptr == '\0' && !errno && 74 val <= UINT_MAX); 75 *out = val; 76 } 77 return ret; 78 } 79 80 bool GetBoolFromJson(const Json::Value& in, bool* out) { 81 bool ret; 82 if (!in.isString()) { 83 ret = in.isConvertibleTo(Json::booleanValue); 84 if (ret) { 85 *out = in.asBool(); 86 } 87 } else { 88 if (in.asString() == "true") { 89 *out = true; 90 ret = true; 91 } else if (in.asString() == "false") { 92 *out = false; 93 ret = true; 94 } else { 95 ret = false; 96 } 97 } 98 return ret; 99 } 100 101 bool GetDoubleFromJson(const Json::Value& in, double* out) { 102 bool ret; 103 if (!in.isString()) { 104 ret = in.isConvertibleTo(Json::realValue); 105 if (ret) { 106 *out = in.asDouble(); 107 } 108 } else { 109 double val; 110 const char* c_str = in.asCString(); 111 char* end_ptr; 112 errno = 0; 113 val = strtod(c_str, &end_ptr); 114 ret = (end_ptr != c_str && *end_ptr == '\0' && !errno); 115 *out = val; 116 } 117 return ret; 118 } 119 120 namespace { 121 template<typename T> 122 bool JsonArrayToVector(const Json::Value& value, 123 bool (*getter)(const Json::Value& in, T* out), 124 std::vector<T> *vec) { 125 vec->clear(); 126 if (!value.isArray()) { 127 return false; 128 } 129 130 for (Json::Value::ArrayIndex i = 0; i < value.size(); ++i) { 131 T val; 132 if (!getter(value[i], &val)) { 133 return false; 134 } 135 vec->push_back(val); 136 } 137 138 return true; 139 } 140 // Trivial getter helper 141 bool GetValueFromJson(const Json::Value& in, Json::Value* out) { 142 *out = in; 143 return true; 144 } 145 } // unnamed namespace 146 147 bool JsonArrayToValueVector(const Json::Value& in, 148 std::vector<Json::Value>* out) { 149 return JsonArrayToVector(in, GetValueFromJson, out); 150 } 151 152 bool JsonArrayToIntVector(const Json::Value& in, 153 std::vector<int>* out) { 154 return JsonArrayToVector(in, GetIntFromJson, out); 155 } 156 157 bool JsonArrayToUIntVector(const Json::Value& in, 158 std::vector<unsigned int>* out) { 159 return JsonArrayToVector(in, GetUIntFromJson, out); 160 } 161 162 bool JsonArrayToStringVector(const Json::Value& in, 163 std::vector<std::string>* out) { 164 return JsonArrayToVector(in, GetStringFromJson, out); 165 } 166 167 bool JsonArrayToBoolVector(const Json::Value& in, 168 std::vector<bool>* out) { 169 return JsonArrayToVector(in, GetBoolFromJson, out); 170 } 171 172 bool JsonArrayToDoubleVector(const Json::Value& in, 173 std::vector<double>* out) { 174 return JsonArrayToVector(in, GetDoubleFromJson, out); 175 } 176 177 namespace { 178 template<typename T> 179 Json::Value VectorToJsonArray(const std::vector<T>& vec) { 180 Json::Value result(Json::arrayValue); 181 for (size_t i = 0; i < vec.size(); ++i) { 182 result.append(Json::Value(vec[i])); 183 } 184 return result; 185 } 186 } // unnamed namespace 187 188 Json::Value ValueVectorToJsonArray(const std::vector<Json::Value>& in) { 189 return VectorToJsonArray(in); 190 } 191 192 Json::Value IntVectorToJsonArray(const std::vector<int>& in) { 193 return VectorToJsonArray(in); 194 } 195 196 Json::Value UIntVectorToJsonArray(const std::vector<unsigned int>& in) { 197 return VectorToJsonArray(in); 198 } 199 200 Json::Value StringVectorToJsonArray(const std::vector<std::string>& in) { 201 return VectorToJsonArray(in); 202 } 203 204 Json::Value BoolVectorToJsonArray(const std::vector<bool>& in) { 205 return VectorToJsonArray(in); 206 } 207 208 Json::Value DoubleVectorToJsonArray(const std::vector<double>& in) { 209 return VectorToJsonArray(in); 210 } 211 212 bool GetValueFromJsonArray(const Json::Value& in, size_t n, 213 Json::Value* out) { 214 if (!in.isArray() || !in.isValidIndex(static_cast<int>(n))) { 215 return false; 216 } 217 218 *out = in[static_cast<Json::Value::ArrayIndex>(n)]; 219 return true; 220 } 221 222 bool GetIntFromJsonArray(const Json::Value& in, size_t n, 223 int* out) { 224 Json::Value x; 225 return GetValueFromJsonArray(in, n, &x) && GetIntFromJson(x, out); 226 } 227 228 bool GetUIntFromJsonArray(const Json::Value& in, size_t n, 229 unsigned int* out) { 230 Json::Value x; 231 return GetValueFromJsonArray(in, n, &x) && GetUIntFromJson(x, out); 232 } 233 234 bool GetStringFromJsonArray(const Json::Value& in, size_t n, 235 std::string* out) { 236 Json::Value x; 237 return GetValueFromJsonArray(in, n, &x) && GetStringFromJson(x, out); 238 } 239 240 bool GetBoolFromJsonArray(const Json::Value& in, size_t n, 241 bool* out) { 242 Json::Value x; 243 return GetValueFromJsonArray(in, n, &x) && GetBoolFromJson(x, out); 244 } 245 246 bool GetDoubleFromJsonArray(const Json::Value& in, size_t n, 247 double* out) { 248 Json::Value x; 249 return GetValueFromJsonArray(in, n, &x) && GetDoubleFromJson(x, out); 250 } 251 252 bool GetValueFromJsonObject(const Json::Value& in, const std::string& k, 253 Json::Value* out) { 254 if (!in.isObject() || !in.isMember(k)) { 255 return false; 256 } 257 258 *out = in[k]; 259 return true; 260 } 261 262 bool GetIntFromJsonObject(const Json::Value& in, const std::string& k, 263 int* out) { 264 Json::Value x; 265 return GetValueFromJsonObject(in, k, &x) && GetIntFromJson(x, out); 266 } 267 268 bool GetUIntFromJsonObject(const Json::Value& in, const std::string& k, 269 unsigned int* out) { 270 Json::Value x; 271 return GetValueFromJsonObject(in, k, &x) && GetUIntFromJson(x, out); 272 } 273 274 bool GetStringFromJsonObject(const Json::Value& in, const std::string& k, 275 std::string* out) { 276 Json::Value x; 277 return GetValueFromJsonObject(in, k, &x) && GetStringFromJson(x, out); 278 } 279 280 bool GetBoolFromJsonObject(const Json::Value& in, const std::string& k, 281 bool* out) { 282 Json::Value x; 283 return GetValueFromJsonObject(in, k, &x) && GetBoolFromJson(x, out); 284 } 285 286 bool GetDoubleFromJsonObject(const Json::Value& in, const std::string& k, 287 double* out) { 288 Json::Value x; 289 return GetValueFromJsonObject(in, k, &x) && GetDoubleFromJson(x, out); 290 } 291 292 std::string JsonValueToString(const Json::Value& json) { 293 Json::FastWriter w; 294 std::string value = w.write(json); 295 return value.substr(0, value.size() - 1); // trim trailing newline 296 } 297