Encode will encode the content, with a dictionary if initialized for it.
(blk *blockEnc, src []byte)
| 532 | |
| 533 | // Encode will encode the content, with a dictionary if initialized for it. |
| 534 | func (e *fastEncoderDict) Encode(blk *blockEnc, src []byte) { |
| 535 | const ( |
| 536 | inputMargin = 8 |
| 537 | minNonLiteralBlockSize = 1 + 1 + inputMargin |
| 538 | ) |
| 539 | if e.allDirty || len(src) > 32<<10 { |
| 540 | e.fastEncoder.Encode(blk, src) |
| 541 | e.allDirty = true |
| 542 | return |
| 543 | } |
| 544 | // Protect against e.cur wraparound. |
| 545 | for e.cur >= e.bufferReset-int32(len(e.hist)) { |
| 546 | if len(e.hist) == 0 { |
| 547 | e.table = [tableSize]tableEntry{} |
| 548 | e.cur = e.maxMatchOff |
| 549 | break |
| 550 | } |
| 551 | // Shift down everything in the table that isn't already too far away. |
| 552 | minOff := e.cur + int32(len(e.hist)) - e.maxMatchOff |
| 553 | for i := range e.table[:] { |
| 554 | v := e.table[i].offset |
| 555 | if v < minOff { |
| 556 | v = 0 |
| 557 | } else { |
| 558 | v = v - e.cur + e.maxMatchOff |
| 559 | } |
| 560 | e.table[i].offset = v |
| 561 | } |
| 562 | e.cur = e.maxMatchOff |
| 563 | break |
| 564 | } |
| 565 | |
| 566 | s := e.addBlock(src) |
| 567 | blk.size = len(src) |
| 568 | if len(src) < minNonLiteralBlockSize { |
| 569 | blk.extraLits = len(src) |
| 570 | blk.literals = blk.literals[:len(src)] |
| 571 | copy(blk.literals, src) |
| 572 | return |
| 573 | } |
| 574 | |
| 575 | // Override src |
| 576 | src = e.hist |
| 577 | sLimit := int32(len(src)) - inputMargin |
| 578 | // stepSize is the number of bytes to skip on every main loop iteration. |
| 579 | // It should be >= 2. |
| 580 | const stepSize = 2 |
| 581 | |
| 582 | // TEMPLATE |
| 583 | const hashLog = tableBits |
| 584 | // seems global, but would be nice to tweak. |
| 585 | const kSearchStrength = 7 |
| 586 | |
| 587 | // nextEmit is where in src the next emitLiteral should start from. |
| 588 | nextEmit := s |
| 589 | cv := load6432(src, s) |
| 590 | |
| 591 | // Relative offsets |