| 217 | } |
| 218 | |
| 219 | static StringContainer valueToQuotedStringN(const char* value, size_t length, bool emitUTF8 = false) { |
| 220 | if (value == nullptr) |
| 221 | return ""; |
| 222 | |
| 223 | if (!doesAnyCharRequireEscaping(value, length)) |
| 224 | return StringContainer("\"") + value + "\""; |
| 225 | // We have to walk value and escape any special characters. |
| 226 | // Appending to StringContainer is not efficient, but this should be rare. |
| 227 | // (Note: forward slashes are *not* rare, but I am not escaping them.) |
| 228 | StringContainer::size_type maxsize = length * 2 + 3; // allescaped+quotes+NULL |
| 229 | StringContainer result; |
| 230 | result.reserve(maxsize); // to avoid lots of mallocs |
| 231 | result += "\""; |
| 232 | char const* end = value + length; |
| 233 | for (const char* c = value; c != end; ++c) { |
| 234 | switch (*c) { |
| 235 | case '\"': |
| 236 | result += "\\\""; |
| 237 | break; |
| 238 | case '\\': |
| 239 | result += "\\\\"; |
| 240 | break; |
| 241 | case '\b': |
| 242 | result += "\\b"; |
| 243 | break; |
| 244 | case '\f': |
| 245 | result += "\\f"; |
| 246 | break; |
| 247 | case '\n': |
| 248 | result += "\\n"; |
| 249 | break; |
| 250 | case '\r': |
| 251 | result += "\\r"; |
| 252 | break; |
| 253 | case '\t': |
| 254 | result += "\\t"; |
| 255 | break; |
| 256 | // case '/': |
| 257 | // Even though \/ is considered a legal escape in JSON, a bare |
| 258 | // slash is also legal, so I see no reason to escape it. |
| 259 | // (I hope I am not misunderstanding something.) |
| 260 | // blep notes: actually escaping \/ may be useful in javascript to avoid </ |
| 261 | // sequence. |
| 262 | // Should add a flag to allow this compatibility mode and prevent this |
| 263 | // sequence from occurring. |
| 264 | default: { |
| 265 | if (emitUTF8) { |
| 266 | unsigned codepoint = static_cast<unsigned char>(*c); |
| 267 | if (codepoint < 0x20) { |
| 268 | appendHex(result, codepoint); |
| 269 | } else { |
| 270 | appendRaw(result, codepoint); |
| 271 | } |
| 272 | } else { |
| 273 | unsigned codepoint = utf8ToCodepoint(c, end); // modifies `c` |
| 274 | if (codepoint < 0x20) { |
| 275 | appendHex(result, codepoint); |
| 276 | } else if (codepoint < 0x80) { |
no test coverage detected