For large blocks we decode and process in same function in single threaded mode, so we do not need to store intermediate data in memory.
| 518 | // For large blocks we decode and process in same function in single threaded |
| 519 | // mode, so we do not need to store intermediate data in memory. |
| 520 | bool Unpack::UnpackLargeBlock(UnpackThreadData &D) |
| 521 | { |
| 522 | if (!D.TableRead) |
| 523 | { |
| 524 | D.TableRead=true; |
| 525 | if (!ReadTables(D.Inp,D.BlockHeader,D.BlockTables)) |
| 526 | { |
| 527 | D.DamagedData=true; |
| 528 | return false; |
| 529 | } |
| 530 | } |
| 531 | |
| 532 | if (D.Inp.InAddr>D.BlockHeader.HeaderSize+D.BlockHeader.BlockSize) |
| 533 | { |
| 534 | D.DamagedData=true; |
| 535 | return false; |
| 536 | } |
| 537 | |
| 538 | int BlockBorder=D.BlockHeader.BlockStart+D.BlockHeader.BlockSize-1; |
| 539 | |
| 540 | // Reserve enough space even for filter entry. |
| 541 | int DataBorder=D.DataSize-16; |
| 542 | int ReadBorder=Min(BlockBorder,DataBorder); |
| 543 | |
| 544 | while (true) |
| 545 | { |
| 546 | UnpPtr&=MaxWinMask; |
| 547 | if (D.Inp.InAddr>=ReadBorder) |
| 548 | { |
| 549 | if (D.Inp.InAddr>BlockBorder || D.Inp.InAddr==BlockBorder && |
| 550 | D.Inp.InBit>=D.BlockHeader.BlockBitSize) |
| 551 | break; |
| 552 | |
| 553 | // If we do not have any more data in file to read, we must process |
| 554 | // what we have until last byte. Otherwise we can return and append |
| 555 | // more data to unprocessed few bytes. |
| 556 | if ((D.Inp.InAddr>=DataBorder) && !D.NoDataLeft || D.Inp.InAddr>=D.DataSize) |
| 557 | { |
| 558 | D.Incomplete=true; |
| 559 | break; |
| 560 | } |
| 561 | } |
| 562 | if (((WriteBorder-UnpPtr) & MaxWinMask)<MAX_INC_LZ_MATCH && WriteBorder!=UnpPtr) |
| 563 | { |
| 564 | UnpWriteBuf(); |
| 565 | if (WrittenFileSize>DestUnpSize) |
| 566 | return false; |
| 567 | } |
| 568 | |
| 569 | uint MainSlot=DecodeNumber(D.Inp,&D.BlockTables.LD); |
| 570 | if (MainSlot<256) |
| 571 | { |
| 572 | Window[UnpPtr++]=(byte)MainSlot; |
| 573 | continue; |
| 574 | } |
| 575 | if (MainSlot>=262) |
| 576 | { |
| 577 | uint Length=SlotToLength(D.Inp,MainSlot-262); |