OLD | NEW |
1 // Protocol Buffers - Google's data interchange format | 1 // Protocol Buffers - Google's data interchange format |
2 // Copyright 2008 Google Inc. All rights reserved. | 2 // Copyright 2008 Google Inc. All rights reserved. |
3 // https://developers.google.com/protocol-buffers/ | 3 // https://developers.google.com/protocol-buffers/ |
4 // | 4 // |
5 // Redistribution and use in source and binary forms, with or without | 5 // Redistribution and use in source and binary forms, with or without |
6 // modification, are permitted provided that the following conditions are | 6 // modification, are permitted provided that the following conditions are |
7 // met: | 7 // met: |
8 // | 8 // |
9 // * Redistributions of source code must retain the above copyright | 9 // * Redistributions of source code must retain the above copyright |
10 // notice, this list of conditions and the following disclaimer. | 10 // notice, this list of conditions and the following disclaimer. |
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369 | 369 |
370 // We have overrun the maximum size of a varint (10 bytes). Assume | 370 // We have overrun the maximum size of a varint (10 bytes). Assume |
371 // the data is corrupt. | 371 // the data is corrupt. |
372 return std::make_pair(false, ptr); | 372 return std::make_pair(false, ptr); |
373 | 373 |
374 done: | 374 done: |
375 *value = result; | 375 *value = result; |
376 return std::make_pair(true, ptr); | 376 return std::make_pair(true, ptr); |
377 } | 377 } |
378 | 378 |
379 GOOGLE_ATTRIBUTE_ALWAYS_INLINE::std::pair<bool, const uint8*> ReadVarint64FromAr
ray( | |
380 const uint8* buffer, uint64* value); | |
381 inline ::std::pair<bool, const uint8*> ReadVarint64FromArray( | |
382 const uint8* buffer, uint64* value) { | |
383 const uint8* ptr = buffer; | |
384 uint32 b; | |
385 | |
386 // Splitting into 32-bit pieces gives better performance on 32-bit | |
387 // processors. | |
388 uint32 part0 = 0, part1 = 0, part2 = 0; | |
389 | |
390 b = *(ptr++); part0 = b ; if (!(b & 0x80)) goto done; | |
391 part0 -= 0x80; | |
392 b = *(ptr++); part0 += b << 7; if (!(b & 0x80)) goto done; | |
393 part0 -= 0x80 << 7; | |
394 b = *(ptr++); part0 += b << 14; if (!(b & 0x80)) goto done; | |
395 part0 -= 0x80 << 14; | |
396 b = *(ptr++); part0 += b << 21; if (!(b & 0x80)) goto done; | |
397 part0 -= 0x80 << 21; | |
398 b = *(ptr++); part1 = b ; if (!(b & 0x80)) goto done; | |
399 part1 -= 0x80; | |
400 b = *(ptr++); part1 += b << 7; if (!(b & 0x80)) goto done; | |
401 part1 -= 0x80 << 7; | |
402 b = *(ptr++); part1 += b << 14; if (!(b & 0x80)) goto done; | |
403 part1 -= 0x80 << 14; | |
404 b = *(ptr++); part1 += b << 21; if (!(b & 0x80)) goto done; | |
405 part1 -= 0x80 << 21; | |
406 b = *(ptr++); part2 = b ; if (!(b & 0x80)) goto done; | |
407 part2 -= 0x80; | |
408 b = *(ptr++); part2 += b << 7; if (!(b & 0x80)) goto done; | |
409 // "part2 -= 0x80 << 7" is irrelevant because (0x80 << 7) << 56 is 0. | |
410 | |
411 // We have overrun the maximum size of a varint (10 bytes). Assume | |
412 // the data is corrupt. | |
413 return std::make_pair(false, ptr); | |
414 | |
415 done: | |
416 *value = (static_cast<uint64>(part0)) | | |
417 (static_cast<uint64>(part1) << 28) | | |
418 (static_cast<uint64>(part2) << 56); | |
419 return std::make_pair(true, ptr); | |
420 } | |
421 | |
422 } // namespace | 379 } // namespace |
423 | 380 |
424 bool CodedInputStream::ReadVarint32Slow(uint32* value) { | 381 bool CodedInputStream::ReadVarint32Slow(uint32* value) { |
425 // Directly invoke ReadVarint64Fallback, since we already tried to optimize | 382 // Directly invoke ReadVarint64Fallback, since we already tried to optimize |
426 // for one-byte varints. | 383 // for one-byte varints. |
427 std::pair<uint64, bool> p = ReadVarint64Fallback(); | 384 std::pair<uint64, bool> p = ReadVarint64Fallback(); |
428 *value = static_cast<uint32>(p.first); | 385 *value = static_cast<uint32>(p.first); |
429 return p.second; | 386 return p.second; |
430 } | 387 } |
431 | 388 |
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444 return temp; | 401 return temp; |
445 } else { | 402 } else { |
446 // Really slow case: we will incur the cost of an extra function call here, | 403 // Really slow case: we will incur the cost of an extra function call here, |
447 // but moving this out of line reduces the size of this function, which | 404 // but moving this out of line reduces the size of this function, which |
448 // improves the common case. In micro benchmarks, this is worth about 10-15% | 405 // improves the common case. In micro benchmarks, this is worth about 10-15% |
449 uint32 temp; | 406 uint32 temp; |
450 return ReadVarint32Slow(&temp) ? static_cast<int64>(temp) : -1; | 407 return ReadVarint32Slow(&temp) ? static_cast<int64>(temp) : -1; |
451 } | 408 } |
452 } | 409 } |
453 | 410 |
454 int CodedInputStream::ReadVarintSizeAsIntSlow() { | |
455 // Directly invoke ReadVarint64Fallback, since we already tried to optimize | |
456 // for one-byte varints. | |
457 std::pair<uint64, bool> p = ReadVarint64Fallback(); | |
458 if (!p.second || p.first > static_cast<uint64>(INT_MAX)) return -1; | |
459 return p.first; | |
460 } | |
461 | |
462 int CodedInputStream::ReadVarintSizeAsIntFallback() { | |
463 if (BufferSize() >= kMaxVarintBytes || | |
464 // Optimization: We're also safe if the buffer is non-empty and it ends | |
465 // with a byte that would terminate a varint. | |
466 (buffer_end_ > buffer_ && !(buffer_end_[-1] & 0x80))) { | |
467 uint64 temp; | |
468 ::std::pair<bool, const uint8*> p = ReadVarint64FromArray(buffer_, &temp); | |
469 if (!p.first || temp > static_cast<uint64>(INT_MAX)) return -1; | |
470 buffer_ = p.second; | |
471 return temp; | |
472 } else { | |
473 // Really slow case: we will incur the cost of an extra function call here, | |
474 // but moving this out of line reduces the size of this function, which | |
475 // improves the common case. In micro benchmarks, this is worth about 10-15% | |
476 return ReadVarintSizeAsIntSlow(); | |
477 } | |
478 } | |
479 | |
480 uint32 CodedInputStream::ReadTagSlow() { | 411 uint32 CodedInputStream::ReadTagSlow() { |
481 if (buffer_ == buffer_end_) { | 412 if (buffer_ == buffer_end_) { |
482 // Call refresh. | 413 // Call refresh. |
483 if (!Refresh()) { | 414 if (!Refresh()) { |
484 // Refresh failed. Make sure that it failed due to EOF, not because | 415 // Refresh failed. Make sure that it failed due to EOF, not because |
485 // we hit total_bytes_limit_, which, unlike normal limits, is not a | 416 // we hit total_bytes_limit_, which, unlike normal limits, is not a |
486 // valid place to end a message. | 417 // valid place to end a message. |
487 int current_position = total_bytes_read_ - buffer_size_after_limit_; | 418 int current_position = total_bytes_read_ - buffer_size_after_limit_; |
488 if (current_position >= total_bytes_limit_) { | 419 if (current_position >= total_bytes_limit_) { |
489 // Hit total_bytes_limit_. But if we also hit the normal limit, | 420 // Hit total_bytes_limit_. But if we also hit the normal limit, |
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542 | 473 |
543 bool CodedInputStream::ReadVarint64Slow(uint64* value) { | 474 bool CodedInputStream::ReadVarint64Slow(uint64* value) { |
544 // Slow path: This read might cross the end of the buffer, so we | 475 // Slow path: This read might cross the end of the buffer, so we |
545 // need to check and refresh the buffer if and when it does. | 476 // need to check and refresh the buffer if and when it does. |
546 | 477 |
547 uint64 result = 0; | 478 uint64 result = 0; |
548 int count = 0; | 479 int count = 0; |
549 uint32 b; | 480 uint32 b; |
550 | 481 |
551 do { | 482 do { |
552 if (count == kMaxVarintBytes) { | 483 if (count == kMaxVarintBytes) return false; |
553 *value = 0; | |
554 return false; | |
555 } | |
556 while (buffer_ == buffer_end_) { | 484 while (buffer_ == buffer_end_) { |
557 if (!Refresh()) { | 485 if (!Refresh()) return false; |
558 *value = 0; | |
559 return false; | |
560 } | |
561 } | 486 } |
562 b = *buffer_; | 487 b = *buffer_; |
563 result |= static_cast<uint64>(b & 0x7F) << (7 * count); | 488 result |= static_cast<uint64>(b & 0x7F) << (7 * count); |
564 Advance(1); | 489 Advance(1); |
565 ++count; | 490 ++count; |
566 } while (b & 0x80); | 491 } while (b & 0x80); |
567 | 492 |
568 *value = result; | 493 *value = result; |
569 return true; | 494 return true; |
570 } | 495 } |
571 | 496 |
572 std::pair<uint64, bool> CodedInputStream::ReadVarint64Fallback() { | 497 std::pair<uint64, bool> CodedInputStream::ReadVarint64Fallback() { |
573 if (BufferSize() >= kMaxVarintBytes || | 498 if (BufferSize() >= kMaxVarintBytes || |
574 // Optimization: We're also safe if the buffer is non-empty and it ends | 499 // Optimization: We're also safe if the buffer is non-empty and it ends |
575 // with a byte that would terminate a varint. | 500 // with a byte that would terminate a varint. |
576 (buffer_end_ > buffer_ && !(buffer_end_[-1] & 0x80))) { | 501 (buffer_end_ > buffer_ && !(buffer_end_[-1] & 0x80))) { |
577 uint64 temp; | 502 // Fast path: We have enough bytes left in the buffer to guarantee that |
578 ::std::pair<bool, const uint8*> p = ReadVarint64FromArray(buffer_, &temp); | 503 // this read won't cross the end, so we can skip the checks. |
579 if (!p.first) { | 504 |
580 return std::make_pair(0, false); | 505 const uint8* ptr = buffer_; |
581 } | 506 uint32 b; |
582 buffer_ = p.second; | 507 |
583 return std::make_pair(temp, true); | 508 // Splitting into 32-bit pieces gives better performance on 32-bit |
| 509 // processors. |
| 510 uint32 part0 = 0, part1 = 0, part2 = 0; |
| 511 |
| 512 b = *(ptr++); part0 = b ; if (!(b & 0x80)) goto done; |
| 513 part0 -= 0x80; |
| 514 b = *(ptr++); part0 += b << 7; if (!(b & 0x80)) goto done; |
| 515 part0 -= 0x80 << 7; |
| 516 b = *(ptr++); part0 += b << 14; if (!(b & 0x80)) goto done; |
| 517 part0 -= 0x80 << 14; |
| 518 b = *(ptr++); part0 += b << 21; if (!(b & 0x80)) goto done; |
| 519 part0 -= 0x80 << 21; |
| 520 b = *(ptr++); part1 = b ; if (!(b & 0x80)) goto done; |
| 521 part1 -= 0x80; |
| 522 b = *(ptr++); part1 += b << 7; if (!(b & 0x80)) goto done; |
| 523 part1 -= 0x80 << 7; |
| 524 b = *(ptr++); part1 += b << 14; if (!(b & 0x80)) goto done; |
| 525 part1 -= 0x80 << 14; |
| 526 b = *(ptr++); part1 += b << 21; if (!(b & 0x80)) goto done; |
| 527 part1 -= 0x80 << 21; |
| 528 b = *(ptr++); part2 = b ; if (!(b & 0x80)) goto done; |
| 529 part2 -= 0x80; |
| 530 b = *(ptr++); part2 += b << 7; if (!(b & 0x80)) goto done; |
| 531 // "part2 -= 0x80 << 7" is irrelevant because (0x80 << 7) << 56 is 0. |
| 532 |
| 533 // We have overrun the maximum size of a varint (10 bytes). The data |
| 534 // must be corrupt. |
| 535 return std::make_pair(0, false); |
| 536 |
| 537 done: |
| 538 Advance(ptr - buffer_); |
| 539 return std::make_pair((static_cast<uint64>(part0)) | |
| 540 (static_cast<uint64>(part1) << 28) | |
| 541 (static_cast<uint64>(part2) << 56), |
| 542 true); |
584 } else { | 543 } else { |
585 uint64 temp; | 544 uint64 temp; |
586 bool success = ReadVarint64Slow(&temp); | 545 bool success = ReadVarint64Slow(&temp); |
587 return std::make_pair(temp, success); | 546 return std::make_pair(temp, success); |
588 } | 547 } |
589 } | 548 } |
590 | 549 |
591 bool CodedInputStream::Refresh() { | 550 bool CodedInputStream::Refresh() { |
592 GOOGLE_DCHECK_EQ(0, BufferSize()); | 551 GOOGLE_DCHECK_EQ(0, BufferSize()); |
593 | 552 |
594 if (buffer_size_after_limit_ > 0 || overflow_bytes_ > 0 || | 553 if (buffer_size_after_limit_ > 0 || overflow_bytes_ > 0 || |
595 total_bytes_read_ == current_limit_) { | 554 total_bytes_read_ == current_limit_) { |
596 // We've hit a limit. Stop. | 555 // We've hit a limit. Stop. |
597 int current_position = total_bytes_read_ - buffer_size_after_limit_; | 556 int current_position = total_bytes_read_ - buffer_size_after_limit_; |
598 | 557 |
599 if (current_position >= total_bytes_limit_ && | 558 if (current_position >= total_bytes_limit_ && |
600 total_bytes_limit_ != current_limit_) { | 559 total_bytes_limit_ != current_limit_) { |
601 // Hit total_bytes_limit_. | 560 // Hit total_bytes_limit_. |
602 PrintTotalBytesLimitError(); | 561 PrintTotalBytesLimitError(); |
603 } | 562 } |
604 | 563 |
605 return false; | 564 return false; |
606 } | 565 } |
607 | 566 |
608 if (total_bytes_warning_threshold_ >= 0 && | 567 if (total_bytes_warning_threshold_ >= 0 && |
609 total_bytes_read_ >= total_bytes_warning_threshold_) { | 568 total_bytes_read_ >= total_bytes_warning_threshold_) { |
610 GOOGLE_LOG(INFO) << "Reading dangerously large protocol message. If the " | 569 GOOGLE_LOG(WARNING) << "Reading dangerously large protocol message. If th
e " |
611 "message turns out to be larger than " | 570 "message turns out to be larger than " |
612 << total_bytes_limit_ << " bytes, parsing will be halted " | 571 << total_bytes_limit_ << " bytes, parsing will be halted " |
613 "for security reasons. To increase the limit (or to " | 572 "for security reasons. To increase the limit (or to " |
614 "disable these warnings), see " | 573 "disable these warnings), see " |
615 "CodedInputStream::SetTotalBytesLimit() in " | 574 "CodedInputStream::SetTotalBytesLimit() in " |
616 "google/protobuf/io/coded_stream.h."; | 575 "google/protobuf/io/coded_stream.h."; |
617 | 576 |
618 // Don't warn again for this stream, and print total size at the end. | 577 // Don't warn again for this stream, and print total size at the end. |
619 total_bytes_warning_threshold_ = -2; | 578 total_bytes_warning_threshold_ = -2; |
620 } | 579 } |
621 | 580 |
622 const void* void_buffer; | 581 const void* void_buffer; |
623 int buffer_size; | 582 int buffer_size; |
624 if (NextNonEmpty(input_, &void_buffer, &buffer_size)) { | 583 if (NextNonEmpty(input_, &void_buffer, &buffer_size)) { |
625 buffer_ = reinterpret_cast<const uint8*>(void_buffer); | 584 buffer_ = reinterpret_cast<const uint8*>(void_buffer); |
626 buffer_end_ = buffer_ + buffer_size; | 585 buffer_end_ = buffer_ + buffer_size; |
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648 return true; | 607 return true; |
649 } else { | 608 } else { |
650 buffer_ = NULL; | 609 buffer_ = NULL; |
651 buffer_end_ = NULL; | 610 buffer_end_ = NULL; |
652 return false; | 611 return false; |
653 } | 612 } |
654 } | 613 } |
655 | 614 |
656 // CodedOutputStream ================================================= | 615 // CodedOutputStream ================================================= |
657 | 616 |
658 bool CodedOutputStream::default_serialization_deterministic_ = false; | |
659 | |
660 CodedOutputStream::CodedOutputStream(ZeroCopyOutputStream* output) | 617 CodedOutputStream::CodedOutputStream(ZeroCopyOutputStream* output) |
661 : output_(output), | 618 : output_(output), |
662 buffer_(NULL), | 619 buffer_(NULL), |
663 buffer_size_(0), | 620 buffer_size_(0), |
664 total_bytes_(0), | 621 total_bytes_(0), |
665 had_error_(false), | 622 had_error_(false), |
666 aliasing_enabled_(false), | 623 aliasing_enabled_(false) { |
667 serialization_deterministic_is_overridden_(false) { | |
668 // Eagerly Refresh() so buffer space is immediately available. | 624 // Eagerly Refresh() so buffer space is immediately available. |
669 Refresh(); | 625 Refresh(); |
670 // The Refresh() may have failed. If the client doesn't write any data, | 626 // The Refresh() may have failed. If the client doesn't write any data, |
671 // though, don't consider this an error. If the client does write data, then | 627 // though, don't consider this an error. If the client does write data, then |
672 // another Refresh() will be attempted and it will set the error once again. | 628 // another Refresh() will be attempted and it will set the error once again. |
673 had_error_ = false; | 629 had_error_ = false; |
674 } | 630 } |
675 | 631 |
676 CodedOutputStream::CodedOutputStream(ZeroCopyOutputStream* output, | 632 CodedOutputStream::CodedOutputStream(ZeroCopyOutputStream* output, |
677 bool do_eager_refresh) | 633 bool do_eager_refresh) |
678 : output_(output), | 634 : output_(output), |
679 buffer_(NULL), | 635 buffer_(NULL), |
680 buffer_size_(0), | 636 buffer_size_(0), |
681 total_bytes_(0), | 637 total_bytes_(0), |
682 had_error_(false), | 638 had_error_(false), |
683 aliasing_enabled_(false), | 639 aliasing_enabled_(false) { |
684 serialization_deterministic_is_overridden_(false) { | |
685 if (do_eager_refresh) { | 640 if (do_eager_refresh) { |
686 // Eagerly Refresh() so buffer space is immediately available. | 641 // Eagerly Refresh() so buffer space is immediately available. |
687 Refresh(); | 642 Refresh(); |
688 // The Refresh() may have failed. If the client doesn't write any data, | 643 // The Refresh() may have failed. If the client doesn't write any data, |
689 // though, don't consider this an error. If the client does write data, then | 644 // though, don't consider this an error. If the client does write data, then |
690 // another Refresh() will be attempted and it will set the error once again. | 645 // another Refresh() will be attempted and it will set the error once again. |
691 had_error_ = false; | 646 had_error_ = false; |
692 } | 647 } |
693 } | 648 } |
694 | 649 |
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787 } | 742 } |
788 | 743 |
789 void CodedOutputStream::WriteVarint32SlowPath(uint32 value) { | 744 void CodedOutputStream::WriteVarint32SlowPath(uint32 value) { |
790 uint8 bytes[kMaxVarint32Bytes]; | 745 uint8 bytes[kMaxVarint32Bytes]; |
791 uint8* target = &bytes[0]; | 746 uint8* target = &bytes[0]; |
792 uint8* end = WriteVarint32ToArray(value, target); | 747 uint8* end = WriteVarint32ToArray(value, target); |
793 int size = end - target; | 748 int size = end - target; |
794 WriteRaw(bytes, size); | 749 WriteRaw(bytes, size); |
795 } | 750 } |
796 | 751 |
797 void CodedOutputStream::WriteVarint64SlowPath(uint64 value) { | 752 inline uint8* CodedOutputStream::WriteVarint64ToArrayInline( |
798 uint8 bytes[kMaxVarintBytes]; | 753 uint64 value, uint8* target) { |
799 uint8* target = &bytes[0]; | 754 // Splitting into 32-bit pieces gives better performance on 32-bit |
800 uint8* end = WriteVarint64ToArray(value, target); | 755 // processors. |
801 int size = end - target; | 756 uint32 part0 = static_cast<uint32>(value ); |
802 WriteRaw(bytes, size); | 757 uint32 part1 = static_cast<uint32>(value >> 28); |
| 758 uint32 part2 = static_cast<uint32>(value >> 56); |
| 759 |
| 760 int size; |
| 761 |
| 762 // Here we can't really optimize for small numbers, since the value is |
| 763 // split into three parts. Cheking for numbers < 128, for instance, |
| 764 // would require three comparisons, since you'd have to make sure part1 |
| 765 // and part2 are zero. However, if the caller is using 64-bit integers, |
| 766 // it is likely that they expect the numbers to often be very large, so |
| 767 // we probably don't want to optimize for small numbers anyway. Thus, |
| 768 // we end up with a hardcoded binary search tree... |
| 769 if (part2 == 0) { |
| 770 if (part1 == 0) { |
| 771 if (part0 < (1 << 14)) { |
| 772 if (part0 < (1 << 7)) { |
| 773 size = 1; goto size1; |
| 774 } else { |
| 775 size = 2; goto size2; |
| 776 } |
| 777 } else { |
| 778 if (part0 < (1 << 21)) { |
| 779 size = 3; goto size3; |
| 780 } else { |
| 781 size = 4; goto size4; |
| 782 } |
| 783 } |
| 784 } else { |
| 785 if (part1 < (1 << 14)) { |
| 786 if (part1 < (1 << 7)) { |
| 787 size = 5; goto size5; |
| 788 } else { |
| 789 size = 6; goto size6; |
| 790 } |
| 791 } else { |
| 792 if (part1 < (1 << 21)) { |
| 793 size = 7; goto size7; |
| 794 } else { |
| 795 size = 8; goto size8; |
| 796 } |
| 797 } |
| 798 } |
| 799 } else { |
| 800 if (part2 < (1 << 7)) { |
| 801 size = 9; goto size9; |
| 802 } else { |
| 803 size = 10; goto size10; |
| 804 } |
| 805 } |
| 806 |
| 807 GOOGLE_LOG(FATAL) << "Can't get here."; |
| 808 |
| 809 size10: target[9] = static_cast<uint8>((part2 >> 7) | 0x80); |
| 810 size9 : target[8] = static_cast<uint8>((part2 ) | 0x80); |
| 811 size8 : target[7] = static_cast<uint8>((part1 >> 21) | 0x80); |
| 812 size7 : target[6] = static_cast<uint8>((part1 >> 14) | 0x80); |
| 813 size6 : target[5] = static_cast<uint8>((part1 >> 7) | 0x80); |
| 814 size5 : target[4] = static_cast<uint8>((part1 ) | 0x80); |
| 815 size4 : target[3] = static_cast<uint8>((part0 >> 21) | 0x80); |
| 816 size3 : target[2] = static_cast<uint8>((part0 >> 14) | 0x80); |
| 817 size2 : target[1] = static_cast<uint8>((part0 >> 7) | 0x80); |
| 818 size1 : target[0] = static_cast<uint8>((part0 ) | 0x80); |
| 819 |
| 820 target[size-1] &= 0x7F; |
| 821 return target + size; |
| 822 } |
| 823 |
| 824 void CodedOutputStream::WriteVarint64(uint64 value) { |
| 825 if (buffer_size_ >= kMaxVarintBytes) { |
| 826 // Fast path: We have enough bytes left in the buffer to guarantee that |
| 827 // this write won't cross the end, so we can skip the checks. |
| 828 uint8* target = buffer_; |
| 829 |
| 830 uint8* end = WriteVarint64ToArrayInline(value, target); |
| 831 int size = end - target; |
| 832 Advance(size); |
| 833 } else { |
| 834 // Slow path: This write might cross the end of the buffer, so we |
| 835 // compose the bytes first then use WriteRaw(). |
| 836 uint8 bytes[kMaxVarintBytes]; |
| 837 int size = 0; |
| 838 while (value > 0x7F) { |
| 839 bytes[size++] = (static_cast<uint8>(value) & 0x7F) | 0x80; |
| 840 value >>= 7; |
| 841 } |
| 842 bytes[size++] = static_cast<uint8>(value) & 0x7F; |
| 843 WriteRaw(bytes, size); |
| 844 } |
| 845 } |
| 846 |
| 847 uint8* CodedOutputStream::WriteVarint64ToArray( |
| 848 uint64 value, uint8* target) { |
| 849 return WriteVarint64ToArrayInline(value, target); |
803 } | 850 } |
804 | 851 |
805 bool CodedOutputStream::Refresh() { | 852 bool CodedOutputStream::Refresh() { |
806 void* void_buffer; | 853 void* void_buffer; |
807 if (output_->Next(&void_buffer, &buffer_size_)) { | 854 if (output_->Next(&void_buffer, &buffer_size_)) { |
808 buffer_ = reinterpret_cast<uint8*>(void_buffer); | 855 buffer_ = reinterpret_cast<uint8*>(void_buffer); |
809 total_bytes_ += buffer_size_; | 856 total_bytes_ += buffer_size_; |
810 return true; | 857 return true; |
811 } else { | 858 } else { |
812 buffer_ = NULL; | 859 buffer_ = NULL; |
813 buffer_size_ = 0; | 860 buffer_size_ = 0; |
814 had_error_ = true; | 861 had_error_ = true; |
815 return false; | 862 return false; |
816 } | 863 } |
817 } | 864 } |
818 | 865 |
819 size_t CodedOutputStream::VarintSize32Fallback(uint32 value) { | 866 int CodedOutputStream::VarintSize32Fallback(uint32 value) { |
820 // This computes floor(log2(value)) / 7 + 1 | 867 if (value < (1 << 7)) { |
821 // Use an explicit multiplication to implement the divide of | 868 return 1; |
822 // a number in the 1..31 range. | 869 } else if (value < (1 << 14)) { |
823 GOOGLE_DCHECK_NE(0, value); // This is enforced by our caller. | 870 return 2; |
824 | 871 } else if (value < (1 << 21)) { |
825 uint32 log2value = Bits::Log2FloorNonZero(value); | 872 return 3; |
826 return static_cast<size_t>((log2value * 9 + 73) / 64); | 873 } else if (value < (1 << 28)) { |
| 874 return 4; |
| 875 } else { |
| 876 return 5; |
| 877 } |
827 } | 878 } |
828 | 879 |
829 size_t CodedOutputStream::VarintSize64(uint64 value) { | 880 int CodedOutputStream::VarintSize64(uint64 value) { |
830 // This computes value == 0 ? 1 : floor(log2(value)) / 7 + 1 | 881 if (value < (1ull << 35)) { |
831 // Use an explicit multiplication to implement the divide of | 882 if (value < (1ull << 7)) { |
832 // a number in the 1..63 range. | 883 return 1; |
833 // Explicit OR 0x1 to avoid calling clz(0), which is undefined. | 884 } else if (value < (1ull << 14)) { |
834 uint32 log2value = Bits::Log2FloorNonZero64(value | 0x1); | 885 return 2; |
835 return static_cast<size_t>((log2value * 9 + 73) / 64); | 886 } else if (value < (1ull << 21)) { |
| 887 return 3; |
| 888 } else if (value < (1ull << 28)) { |
| 889 return 4; |
| 890 } else { |
| 891 return 5; |
| 892 } |
| 893 } else { |
| 894 if (value < (1ull << 42)) { |
| 895 return 6; |
| 896 } else if (value < (1ull << 49)) { |
| 897 return 7; |
| 898 } else if (value < (1ull << 56)) { |
| 899 return 8; |
| 900 } else if (value < (1ull << 63)) { |
| 901 return 9; |
| 902 } else { |
| 903 return 10; |
| 904 } |
| 905 } |
836 } | 906 } |
837 | 907 |
838 uint8* CodedOutputStream::WriteStringWithSizeToArray(const string& str, | 908 uint8* CodedOutputStream::WriteStringWithSizeToArray(const string& str, |
839 uint8* target) { | 909 uint8* target) { |
840 GOOGLE_DCHECK_LE(str.size(), kuint32max); | 910 GOOGLE_DCHECK_LE(str.size(), kuint32max); |
841 target = WriteVarint32ToArray(str.size(), target); | 911 target = WriteVarint32ToArray(str.size(), target); |
842 return WriteStringToArray(str, target); | 912 return WriteStringToArray(str, target); |
843 } | 913 } |
844 | 914 |
845 } // namespace io | 915 } // namespace io |
846 } // namespace protobuf | 916 } // namespace protobuf |
847 } // namespace google | 917 } // namespace google |
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