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| 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | |
| 2 // for details. All rights reserved. Use of this source code is governed by a | |
| 3 // BSD-style license that can be found in the LICENSE file. | |
| 4 | |
| 5 #include "platform/json.h" | |
| 6 | |
| 7 #include "platform/assert.h" | |
| 8 #include "platform/globals.h" | |
| 9 #include "platform/utils.h" | |
| 10 #include "vm/os.h" | |
| 11 | |
| 12 namespace dart { | |
| 13 | |
| 14 JSONScanner::JSONScanner(const char* json_text) { | |
| 15 SetText(json_text); | |
| 16 } | |
| 17 | |
| 18 | |
| 19 void JSONScanner::SetText(const char* json_text) { | |
| 20 current_pos_ = json_text; | |
| 21 token_start_ = json_text; | |
| 22 token_length_ = 0; | |
| 23 token_ = TokenIllegal; | |
| 24 } | |
| 25 | |
| 26 | |
| 27 void JSONScanner::Recognize(Token t) { | |
| 28 ++current_pos_; | |
| 29 token_ = t; | |
| 30 } | |
| 31 | |
| 32 | |
| 33 bool JSONScanner::IsLetter(char ch) const { | |
| 34 return (('A' <= ch) && (ch <= 'Z')) || (('a' <= ch) && (ch <= 'z')); | |
| 35 } | |
| 36 | |
| 37 | |
| 38 bool JSONScanner::IsDigit(char ch) const { | |
| 39 return ('0' <= ch) && (ch <= '9'); | |
| 40 } | |
| 41 | |
| 42 | |
| 43 bool JSONScanner::IsLiteral(const char* literal) { | |
| 44 int i = 0; | |
| 45 while ((literal[i] != '\0') && (current_pos_[i] == literal[i])) { | |
| 46 i++; | |
| 47 } | |
| 48 if ((literal[i] == '\0') && !IsLetter(current_pos_[i])) { | |
| 49 current_pos_ += i; | |
| 50 return true; | |
| 51 } | |
| 52 return false; | |
| 53 } | |
| 54 | |
| 55 | |
| 56 bool JSONScanner::IsStringLiteral(const char* literal) const { | |
| 57 if (token_ != TokenString) { | |
| 58 return false; | |
| 59 } | |
| 60 int i = 0; | |
| 61 while ((i < token_length_) && (token_start_[i] == literal[i])) { | |
| 62 i++; | |
| 63 } | |
| 64 return (i == token_length_) && (literal[i] == '\0'); | |
| 65 } | |
| 66 | |
| 67 | |
| 68 void JSONScanner::Skip(Token matching_token) { | |
| 69 while (!EOM() && (token_ != TokenIllegal)) { | |
| 70 Scan(); | |
| 71 if (token_ == TokenLBrace) { | |
| 72 Skip(TokenRBrace); | |
| 73 } else if (token_ == TokenLBrack) { | |
| 74 Skip(TokenRBrack); | |
| 75 } else if (token_ == matching_token) { | |
| 76 return; | |
| 77 } else if ((token_ == TokenRBrace) || (token_ == TokenRBrack)) { | |
| 78 // Mismatched brace or bracket. | |
| 79 token_ = TokenIllegal; | |
| 80 } | |
| 81 } | |
| 82 } | |
| 83 | |
| 84 | |
| 85 void JSONScanner::ScanString() { | |
| 86 ASSERT(*current_pos_ == '"'); | |
| 87 ++current_pos_; | |
| 88 token_start_ = current_pos_; | |
| 89 while (*current_pos_ != '"') { | |
| 90 if (*current_pos_ == '\0') { | |
| 91 token_length_ = 0; | |
| 92 token_ = TokenIllegal; | |
| 93 return; | |
| 94 } else if (*current_pos_ == '\\') { | |
| 95 ++current_pos_; | |
| 96 if (*current_pos_ == '"') { | |
| 97 // Consume escaped double quote. | |
| 98 ++current_pos_; | |
| 99 } | |
| 100 } else { | |
| 101 ++current_pos_; | |
| 102 } | |
| 103 } | |
| 104 token_ = TokenString; | |
| 105 token_length_ = current_pos_ - token_start_; | |
| 106 ++current_pos_; | |
| 107 } | |
| 108 | |
| 109 | |
| 110 void JSONScanner::ScanNumber() { | |
| 111 if (*current_pos_ == '-') { | |
| 112 ++current_pos_; | |
| 113 } | |
| 114 if (!IsDigit(*current_pos_)) { | |
| 115 token_ = TokenIllegal; | |
| 116 token_length_ = 0; | |
| 117 return; | |
| 118 } | |
| 119 while (IsDigit(*current_pos_)) { | |
| 120 ++current_pos_; | |
| 121 } | |
| 122 if ((*current_pos_ == '.') || | |
| 123 (*current_pos_ == 'e') || | |
| 124 (*current_pos_ == 'E')) { | |
| 125 // Floating point numbers not supported. | |
| 126 token_ = TokenIllegal; | |
| 127 token_length_ = 0; | |
| 128 return; | |
| 129 } | |
| 130 token_ = TokenInteger; | |
| 131 token_length_ = current_pos_ - token_start_; | |
| 132 } | |
| 133 | |
| 134 | |
| 135 void JSONScanner::Scan() { | |
| 136 while ((*current_pos_ == ' ') || | |
| 137 (*current_pos_ == '\t') || | |
| 138 (*current_pos_ == '\n')) { | |
| 139 ++current_pos_; | |
| 140 } | |
| 141 token_start_ = current_pos_; | |
| 142 if (*current_pos_ == '\0') { | |
| 143 token_length_ = 0; | |
| 144 token_ = TokenEOM; | |
| 145 return; | |
| 146 } | |
| 147 switch (*current_pos_) { | |
| 148 case '{': | |
| 149 Recognize(TokenLBrace); | |
| 150 break; | |
| 151 case '}': | |
| 152 Recognize(TokenRBrace); | |
| 153 break; | |
| 154 case '[': | |
| 155 Recognize(TokenLBrack); | |
| 156 break; | |
| 157 case ']': | |
| 158 Recognize(TokenRBrack); | |
| 159 break; | |
| 160 case ':': | |
| 161 Recognize(TokenColon); | |
| 162 break; | |
| 163 case ',': | |
| 164 Recognize(TokenComma); | |
| 165 break; | |
| 166 case '"': | |
| 167 ScanString(); | |
| 168 break; | |
| 169 case '0': | |
| 170 case '1': | |
| 171 case '2': | |
| 172 case '3': | |
| 173 case '4': | |
| 174 case '5': | |
| 175 case '6': | |
| 176 case '7': | |
| 177 case '8': | |
| 178 case '9': | |
| 179 case '-': | |
| 180 ScanNumber(); | |
| 181 break; | |
| 182 default: | |
| 183 if (IsLiteral("true")) { | |
| 184 token_ = TokenTrue; | |
| 185 token_length_ = 4; | |
| 186 } else if (IsLiteral("false")) { | |
| 187 token_ = TokenFalse; | |
| 188 token_length_ = 5; | |
| 189 } else if (IsLiteral("null")) { | |
| 190 token_ = TokenNull; | |
| 191 token_length_ = 4; | |
| 192 } else { | |
| 193 token_length_ = 0; | |
| 194 token_ = TokenIllegal; | |
| 195 } | |
| 196 } | |
| 197 } | |
| 198 | |
| 199 | |
| 200 JSONReader::JSONReader(const char* json_object) | |
| 201 : scanner_(json_object) { | |
| 202 Set(json_object); | |
| 203 } | |
| 204 | |
| 205 | |
| 206 void JSONReader::Set(const char* json_object) { | |
| 207 scanner_.SetText(json_object); | |
| 208 json_object_ = json_object; | |
| 209 error_ = false; | |
| 210 } | |
| 211 | |
| 212 | |
| 213 bool JSONReader::CheckMessage() { | |
| 214 scanner_.SetText(json_object_); | |
| 215 scanner_.Scan(); | |
| 216 CheckObject(); | |
| 217 return true; | |
| 218 } | |
| 219 | |
| 220 | |
| 221 void JSONReader::CheckValue() { | |
| 222 switch (scanner_.CurrentToken()) { | |
| 223 case JSONScanner::TokenLBrace: | |
| 224 CheckObject(); | |
| 225 break; | |
| 226 case JSONScanner::TokenLBrack: | |
| 227 CheckArray(); | |
| 228 break; | |
| 229 case JSONScanner::TokenString: { | |
| 230 // Check the encoding. | |
| 231 const char* s = ValueChars(); | |
| 232 int remaining = ValueLen(); | |
| 233 while (remaining > 0) { | |
| 234 if ((*s == '\n') || (*s == '\t')) { | |
| 235 OS::Print("Un-escaped character in JSON string: '%s'\n", | |
| 236 ValueChars()); | |
| 237 FATAL("illegal character in JSON string value"); | |
| 238 } | |
| 239 s++; | |
| 240 remaining--; | |
| 241 } | |
| 242 scanner_.Scan(); | |
| 243 break; | |
| 244 } | |
| 245 case JSONScanner::TokenInteger: | |
| 246 case JSONScanner::TokenTrue: | |
| 247 case JSONScanner::TokenFalse: | |
| 248 case JSONScanner::TokenNull: | |
| 249 scanner_.Scan(); | |
| 250 break; | |
| 251 default: | |
| 252 OS::Print("Malformed JSON: expected a value but got '%s'\n", | |
| 253 scanner_.TokenChars()); | |
| 254 FATAL("illegal JSON value found"); | |
| 255 } | |
| 256 } | |
| 257 | |
| 258 | |
| 259 #if defined (DEBUG) | |
| 260 #define CHECK_TOKEN(token) \ | |
| 261 if (scanner_.CurrentToken() != token) { \ | |
| 262 OS::Print("Malformed JSON: expected %s but got '%s'\n", \ | |
| 263 #token, scanner_.TokenChars()); \ | |
| 264 intptr_t offset = scanner_.TokenChars() - this->json_object_; \ | |
| 265 OS::Print("Malformed JSON: expected %s at offset %" Pd "of buffer:\n%s\n", \ | |
| 266 #token, offset, this->json_object_); \ | |
| 267 ASSERT(scanner_.CurrentToken() == token); \ | |
| 268 } | |
| 269 #else | |
| 270 #define CHECK_TOKEN(token) | |
| 271 #endif | |
| 272 | |
| 273 | |
| 274 void JSONReader::CheckArray() { | |
| 275 CHECK_TOKEN(JSONScanner::TokenLBrack); | |
| 276 scanner_.Scan(); | |
| 277 while (scanner_.CurrentToken() != JSONScanner::TokenRBrack) { | |
| 278 CheckValue(); | |
| 279 if (scanner_.CurrentToken() != JSONScanner::TokenComma) { | |
| 280 break; | |
| 281 } | |
| 282 scanner_.Scan(); | |
| 283 } | |
| 284 CHECK_TOKEN(JSONScanner::TokenRBrack); | |
| 285 scanner_.Scan(); | |
| 286 } | |
| 287 | |
| 288 | |
| 289 void JSONReader::CheckObject() { | |
| 290 CHECK_TOKEN(JSONScanner::TokenLBrace); | |
| 291 scanner_.Scan(); | |
| 292 while (scanner_.CurrentToken() == JSONScanner::TokenString) { | |
| 293 scanner_.Scan(); | |
| 294 CHECK_TOKEN(JSONScanner::TokenColon); | |
| 295 scanner_.Scan(); | |
| 296 CheckValue(); | |
| 297 if (scanner_.CurrentToken() != JSONScanner::TokenComma) { | |
| 298 break; | |
| 299 } | |
| 300 scanner_.Scan(); | |
| 301 } | |
| 302 CHECK_TOKEN(JSONScanner::TokenRBrace); | |
| 303 scanner_.Scan(); | |
| 304 } | |
| 305 | |
| 306 #undef CHECK_TOKEN | |
| 307 | |
| 308 | |
| 309 bool JSONReader::Seek(const char* name) { | |
| 310 error_ = false; | |
| 311 scanner_.SetText(json_object_); | |
| 312 scanner_.Scan(); | |
| 313 if (scanner_.CurrentToken() != JSONScanner::TokenLBrace) { | |
| 314 error_ = true; | |
| 315 return false; | |
| 316 } | |
| 317 scanner_.Scan(); | |
| 318 if (scanner_.CurrentToken() == JSONScanner::TokenRBrace) { | |
| 319 return false; | |
| 320 } | |
| 321 while (scanner_.CurrentToken() == JSONScanner::TokenString) { | |
| 322 bool found = scanner_.IsStringLiteral(name); | |
| 323 scanner_.Scan(); | |
| 324 if (scanner_.CurrentToken() != JSONScanner::TokenColon) { | |
| 325 error_ = true; | |
| 326 return false; | |
| 327 } | |
| 328 scanner_.Scan(); | |
| 329 switch (scanner_.CurrentToken()) { | |
| 330 case JSONScanner::TokenString: | |
| 331 case JSONScanner::TokenInteger: | |
| 332 case JSONScanner::TokenLBrace: | |
| 333 case JSONScanner::TokenLBrack: | |
| 334 case JSONScanner::TokenTrue: | |
| 335 case JSONScanner::TokenFalse: | |
| 336 case JSONScanner::TokenNull: | |
| 337 // Found a legal value. | |
| 338 if (found) { | |
| 339 return true; | |
| 340 } | |
| 341 break; | |
| 342 default: | |
| 343 error_ = true; | |
| 344 return false; | |
| 345 } | |
| 346 // Skip the value. | |
| 347 if (scanner_.CurrentToken() == JSONScanner::TokenLBrace) { | |
| 348 scanner_.Skip(JSONScanner::TokenRBrace); | |
| 349 if (scanner_.CurrentToken() != JSONScanner::TokenRBrace) { | |
| 350 error_ = true; | |
| 351 return false; | |
| 352 } | |
| 353 } else if (scanner_.CurrentToken() == JSONScanner::TokenLBrack) { | |
| 354 scanner_.Skip(JSONScanner::TokenRBrack); | |
| 355 if (scanner_.CurrentToken() != JSONScanner::TokenRBrack) { | |
| 356 error_ = true; | |
| 357 return false; | |
| 358 } | |
| 359 } | |
| 360 scanner_.Scan(); // Value or closing brace or bracket. | |
| 361 if (scanner_.CurrentToken() == JSONScanner::TokenComma) { | |
| 362 scanner_.Scan(); | |
| 363 } else if (scanner_.CurrentToken() == JSONScanner::TokenRBrace) { | |
| 364 return false; | |
| 365 } else { | |
| 366 error_ = true; | |
| 367 return false; | |
| 368 } | |
| 369 } | |
| 370 error_ = true; | |
| 371 return false; | |
| 372 } | |
| 373 | |
| 374 | |
| 375 const char* JSONReader::EndOfObject() { | |
| 376 bool found = Seek("***"); // Look for illegally named value. | |
| 377 ASSERT(!found); | |
| 378 if (!found && !error_) { | |
| 379 const char* s = scanner_.TokenChars(); | |
| 380 ASSERT(*s == '}'); | |
| 381 return s; | |
| 382 } | |
| 383 return NULL; | |
| 384 } | |
| 385 | |
| 386 | |
| 387 JSONReader::JSONType JSONReader::Type() const { | |
| 388 if (error_) { | |
| 389 return kNone; | |
| 390 } | |
| 391 switch (scanner_.CurrentToken()) { | |
| 392 case JSONScanner::TokenString: | |
| 393 return kString; | |
| 394 case JSONScanner::TokenInteger: | |
| 395 return kInteger; | |
| 396 case JSONScanner::TokenLBrace: | |
| 397 return kObject; | |
| 398 case JSONScanner::TokenLBrack: | |
| 399 return kArray; | |
| 400 case JSONScanner::TokenTrue: | |
| 401 case JSONScanner::TokenFalse: | |
| 402 case JSONScanner::TokenNull: | |
| 403 return kLiteral; | |
| 404 default: | |
| 405 return kNone; | |
| 406 } | |
| 407 } | |
| 408 | |
| 409 | |
| 410 void JSONReader::GetRawValueChars(char* buf, intptr_t buflen) const { | |
| 411 if (Type() == kNone) { | |
| 412 return; | |
| 413 } | |
| 414 intptr_t max = buflen - 1; | |
| 415 if (ValueLen() < max) { | |
| 416 max = ValueLen(); | |
| 417 } | |
| 418 const char* val = ValueChars(); | |
| 419 intptr_t i = 0; | |
| 420 for (; i < max; i++) { | |
| 421 buf[i] = val[i]; | |
| 422 } | |
| 423 buf[i] = '\0'; | |
| 424 } | |
| 425 | |
| 426 | |
| 427 void JSONReader::GetDecodedValueChars(char* buf, intptr_t buflen) const { | |
| 428 if (Type() == kNone) { | |
| 429 return; | |
| 430 } | |
| 431 const intptr_t last_idx = buflen - 1; | |
| 432 const intptr_t value_len = ValueLen(); | |
| 433 const char* val = ValueChars(); | |
| 434 intptr_t buf_idx = 0; | |
| 435 intptr_t val_idx = 0; | |
| 436 while ((buf_idx < last_idx) && (val_idx < value_len)) { | |
| 437 char ch = val[val_idx]; | |
| 438 val_idx++; | |
| 439 buf[buf_idx] = ch; | |
| 440 if ((ch == '\\') && (val_idx < value_len)) { | |
| 441 switch (val[val_idx]) { | |
| 442 case '"': | |
| 443 case '\\': | |
| 444 case '/': | |
| 445 buf[buf_idx] = val[val_idx]; | |
| 446 val_idx++; | |
| 447 break; | |
| 448 case 'b': | |
| 449 buf[buf_idx] = '\b'; | |
| 450 val_idx++; | |
| 451 break; | |
| 452 case 'f': | |
| 453 buf[buf_idx] = '\f'; | |
| 454 val_idx++; | |
| 455 break; | |
| 456 case 'n': | |
| 457 buf[buf_idx] = '\n'; | |
| 458 val_idx++; | |
| 459 break; | |
| 460 case 'r': | |
| 461 buf[buf_idx] = '\r'; | |
| 462 val_idx++; | |
| 463 break; | |
| 464 case 't': | |
| 465 buf[buf_idx] = '\t'; | |
| 466 val_idx++; | |
| 467 break; | |
| 468 case 'u': | |
| 469 // \u00XX | |
| 470 // If the value is malformed or > 255, ignore and copy the | |
| 471 // encoded characters. | |
| 472 if ((val_idx < value_len - 4) && | |
| 473 (val[val_idx + 1] == '0') && (val[val_idx + 2] == '0') && | |
| 474 Utils::IsHexDigit(val[val_idx + 3]) && | |
| 475 Utils::IsHexDigit(val[val_idx + 4])) { | |
| 476 buf[buf_idx] = 16 * Utils::HexDigitToInt(val[val_idx + 3]) + | |
| 477 Utils::HexDigitToInt(val[val_idx + 4]); | |
| 478 val_idx += 5; | |
| 479 } | |
| 480 break; | |
| 481 default: | |
| 482 // Nothing. Copy the character after the backslash | |
| 483 // in the next loop iteration. | |
| 484 break; | |
| 485 } | |
| 486 } | |
| 487 buf_idx++; | |
| 488 } | |
| 489 buf[buf_idx] = '\0'; | |
| 490 } | |
| 491 | |
| 492 | |
| 493 TextBuffer::TextBuffer(intptr_t buf_size) { | |
| 494 ASSERT(buf_size > 0); | |
| 495 buf_ = reinterpret_cast<char*>(malloc(buf_size)); | |
| 496 buf_size_ = buf_size; | |
| 497 Clear(); | |
| 498 } | |
| 499 | |
| 500 | |
| 501 TextBuffer::~TextBuffer() { | |
| 502 free(buf_); | |
| 503 buf_ = NULL; | |
| 504 } | |
| 505 | |
| 506 | |
| 507 void TextBuffer::Clear() { | |
| 508 msg_len_ = 0; | |
| 509 buf_[0] = '\0'; | |
| 510 } | |
| 511 | |
| 512 | |
| 513 const char* TextBuffer::Steal() { | |
| 514 const char* r = buf_; | |
| 515 buf_ = NULL; | |
| 516 buf_size_ = 0; | |
| 517 msg_len_ = 0; | |
| 518 return r; | |
| 519 } | |
| 520 | |
| 521 | |
| 522 void TextBuffer::AddChar(char ch) { | |
| 523 EnsureCapacity(sizeof(ch)); | |
| 524 buf_[msg_len_] = ch; | |
| 525 msg_len_++; | |
| 526 buf_[msg_len_] = '\0'; | |
| 527 } | |
| 528 | |
| 529 | |
| 530 intptr_t TextBuffer::Printf(const char* format, ...) { | |
| 531 va_list args; | |
| 532 va_start(args, format); | |
| 533 intptr_t remaining = buf_size_ - msg_len_; | |
| 534 ASSERT(remaining >= 0); | |
| 535 intptr_t len = OS::VSNPrint(buf_ + msg_len_, remaining, format, args); | |
| 536 va_end(args); | |
| 537 if (len >= remaining) { | |
| 538 EnsureCapacity(len); | |
| 539 remaining = buf_size_ - msg_len_; | |
| 540 ASSERT(remaining > len); | |
| 541 va_list args2; | |
| 542 va_start(args2, format); | |
| 543 intptr_t len2 = OS::VSNPrint(buf_ + msg_len_, remaining, format, args2); | |
| 544 va_end(args2); | |
| 545 ASSERT(len == len2); | |
| 546 } | |
| 547 msg_len_ += len; | |
| 548 buf_[msg_len_] = '\0'; | |
| 549 return len; | |
| 550 } | |
| 551 | |
| 552 | |
| 553 // Write a UTF-16 code unit so it can be read by a JSON parser in a string | |
| 554 // literal. Use escape sequences for characters other than printable ASCII. | |
| 555 void TextBuffer::EscapeAndAddCodeUnit(uint32_t codeunit) { | |
| 556 switch (codeunit) { | |
| 557 case '"': | |
| 558 Printf("%s", "\\\""); | |
| 559 break; | |
| 560 case '\\': | |
| 561 Printf("%s", "\\\\"); | |
| 562 break; | |
| 563 case '/': | |
| 564 Printf("%s", "\\/"); | |
| 565 break; | |
| 566 case '\b': | |
| 567 Printf("%s", "\\b"); | |
| 568 break; | |
| 569 case '\f': | |
| 570 Printf("%s", "\\f"); | |
| 571 break; | |
| 572 case '\n': | |
| 573 Printf("%s", "\\n"); | |
| 574 break; | |
| 575 case '\r': | |
| 576 Printf("%s", "\\r"); | |
| 577 break; | |
| 578 case '\t': | |
| 579 Printf("%s", "\\t"); | |
| 580 break; | |
| 581 default: | |
| 582 if (codeunit < 0x20) { | |
| 583 // Encode character as \u00HH. | |
| 584 uint32_t digit2 = (codeunit >> 4) & 0xf; | |
| 585 uint32_t digit3 = (codeunit & 0xf); | |
| 586 Printf("\\u00%c%c", | |
| 587 digit2 > 9 ? 'A' + (digit2 - 10) : '0' + digit2, | |
| 588 digit3 > 9 ? 'A' + (digit3 - 10) : '0' + digit3); | |
| 589 } else if (codeunit > 127) { | |
| 590 // Encode character as \uHHHH. | |
| 591 uint32_t digit0 = (codeunit >> 12) & 0xf; | |
| 592 uint32_t digit1 = (codeunit >> 8) & 0xf; | |
| 593 uint32_t digit2 = (codeunit >> 4) & 0xf; | |
| 594 uint32_t digit3 = (codeunit & 0xf); | |
| 595 Printf("\\u%c%c%c%c", | |
| 596 digit0 > 9 ? 'A' + (digit0 - 10) : '0' + digit0, | |
| 597 digit1 > 9 ? 'A' + (digit1 - 10) : '0' + digit1, | |
| 598 digit2 > 9 ? 'A' + (digit2 - 10) : '0' + digit2, | |
| 599 digit3 > 9 ? 'A' + (digit3 - 10) : '0' + digit3); | |
| 600 } else { | |
| 601 AddChar(codeunit); | |
| 602 } | |
| 603 } | |
| 604 } | |
| 605 | |
| 606 | |
| 607 void TextBuffer::AddString(const char* s) { | |
| 608 Printf("%s", s); | |
| 609 } | |
| 610 | |
| 611 | |
| 612 void TextBuffer::AddEscapedString(const char* s) { | |
| 613 intptr_t len = strlen(s); | |
| 614 for (int i = 0; i < len; i++) { | |
| 615 EscapeAndAddCodeUnit(s[i]); | |
| 616 } | |
| 617 } | |
| 618 | |
| 619 | |
| 620 void TextBuffer::EnsureCapacity(intptr_t len) { | |
| 621 intptr_t remaining = buf_size_ - msg_len_; | |
| 622 if (remaining <= len) { | |
| 623 const int kBufferSpareCapacity = 64; // Somewhat arbitrary. | |
| 624 // TODO(turnidge): do we need to guard against overflow or other | |
| 625 // security issues here? Text buffers are used by the debugger | |
| 626 // to send user-controlled data (e.g. values of string variables) to | |
| 627 // the debugger front-end. | |
| 628 intptr_t new_size = buf_size_ + len + kBufferSpareCapacity; | |
| 629 char* new_buf = reinterpret_cast<char*>(realloc(buf_, new_size)); | |
| 630 ASSERT(new_buf != NULL); | |
| 631 buf_ = new_buf; | |
| 632 buf_size_ = new_size; | |
| 633 } | |
| 634 } | |
| 635 | |
| 636 } // namespace dart | |
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Chromium Code Reviews
Issue 1497033003:
- Remove the legacy debug protocol. (Closed)
Base URL: git@github.com:dart-lang/sdk.git@master