mirror of
https://github.com/mudler/luet.git
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4adc0dc9b9
Instead of using gox on one side and an action to release, we can merge them together with goreleaser which will build for extra targets (arm, mips if needed in the future) and it also takes care of creating checksums, a source archive, and a changelog and creating a release with all the artifacts. All binaries should respect the old naming convention, so any scripts out there should still work. Signed-off-by: Itxaka <igarcia@suse.com>
115 lines
3.2 KiB
Go
115 lines
3.2 KiB
Go
// Copyright 2019+ Klaus Post. All rights reserved.
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// License information can be found in the LICENSE file.
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// Based on work by Yann Collet, released under BSD License.
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package zstd
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import "math/bits"
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type seqCoders struct {
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llEnc, ofEnc, mlEnc *fseEncoder
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llPrev, ofPrev, mlPrev *fseEncoder
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}
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// swap coders with another (block).
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func (s *seqCoders) swap(other *seqCoders) {
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*s, *other = *other, *s
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}
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// setPrev will update the previous encoders to the actually used ones
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// and make sure a fresh one is in the main slot.
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func (s *seqCoders) setPrev(ll, ml, of *fseEncoder) {
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compareSwap := func(used *fseEncoder, current, prev **fseEncoder) {
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// We used the new one, more current to history and reuse the previous history
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if *current == used {
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*prev, *current = *current, *prev
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c := *current
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p := *prev
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c.reUsed = false
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p.reUsed = true
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return
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}
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if used == *prev {
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return
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}
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// Ensure we cannot reuse by accident
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prevEnc := *prev
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prevEnc.symbolLen = 0
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}
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compareSwap(ll, &s.llEnc, &s.llPrev)
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compareSwap(ml, &s.mlEnc, &s.mlPrev)
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compareSwap(of, &s.ofEnc, &s.ofPrev)
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}
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func highBit(val uint32) (n uint32) {
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return uint32(bits.Len32(val) - 1)
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}
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var llCodeTable = [64]byte{0, 1, 2, 3, 4, 5, 6, 7,
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8, 9, 10, 11, 12, 13, 14, 15,
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16, 16, 17, 17, 18, 18, 19, 19,
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20, 20, 20, 20, 21, 21, 21, 21,
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22, 22, 22, 22, 22, 22, 22, 22,
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23, 23, 23, 23, 23, 23, 23, 23,
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24, 24, 24, 24, 24, 24, 24, 24,
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24, 24, 24, 24, 24, 24, 24, 24}
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// Up to 6 bits
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const maxLLCode = 35
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// llBitsTable translates from ll code to number of bits.
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var llBitsTable = [maxLLCode + 1]byte{
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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1, 1, 1, 1, 2, 2, 3, 3,
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4, 6, 7, 8, 9, 10, 11, 12,
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13, 14, 15, 16}
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// llCode returns the code that represents the literal length requested.
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func llCode(litLength uint32) uint8 {
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const llDeltaCode = 19
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if litLength <= 63 {
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// Compiler insists on bounds check (Go 1.12)
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return llCodeTable[litLength&63]
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}
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return uint8(highBit(litLength)) + llDeltaCode
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}
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var mlCodeTable = [128]byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
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16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
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32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 36, 36, 37, 37, 37, 37,
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38, 38, 38, 38, 38, 38, 38, 38, 39, 39, 39, 39, 39, 39, 39, 39,
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40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40,
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41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41,
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42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42,
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42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42}
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// Up to 6 bits
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const maxMLCode = 52
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// mlBitsTable translates from ml code to number of bits.
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var mlBitsTable = [maxMLCode + 1]byte{
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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1, 1, 1, 1, 2, 2, 3, 3,
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4, 4, 5, 7, 8, 9, 10, 11,
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12, 13, 14, 15, 16}
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// note : mlBase = matchLength - MINMATCH;
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// because it's the format it's stored in seqStore->sequences
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func mlCode(mlBase uint32) uint8 {
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const mlDeltaCode = 36
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if mlBase <= 127 {
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// Compiler insists on bounds check (Go 1.12)
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return mlCodeTable[mlBase&127]
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}
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return uint8(highBit(mlBase)) + mlDeltaCode
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}
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func ofCode(offset uint32) uint8 {
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// A valid offset will always be > 0.
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return uint8(bits.Len32(offset) - 1)
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}
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