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* update github.com/alecthomas/chroma v0.8.0 -> v0.8.1 * github.com/blevesearch/bleve v1.0.10 -> v1.0.12 * editorconfig-core-go v2.1.1 -> v2.3.7 * github.com/gliderlabs/ssh v0.2.2 -> v0.3.1 * migrate editorconfig.ParseBytes to Parse * github.com/shurcooL/vfsgen to 0d455de96546 * github.com/go-git/go-git/v5 v5.1.0 -> v5.2.0 * github.com/google/uuid v1.1.1 -> v1.1.2 * github.com/huandu/xstrings v1.3.0 -> v1.3.2 * github.com/klauspost/compress v1.10.11 -> v1.11.1 * github.com/markbates/goth v1.61.2 -> v1.65.0 * github.com/mattn/go-sqlite3 v1.14.0 -> v1.14.4 * github.com/mholt/archiver v3.3.0 -> v3.3.2 * github.com/microcosm-cc/bluemonday 4f7140c49acb -> v1.0.4 * github.com/minio/minio-go v7.0.4 -> v7.0.5 * github.com/olivere/elastic v7.0.9 -> v7.0.20 * github.com/urfave/cli v1.20.0 -> v1.22.4 * github.com/prometheus/client_golang v1.1.0 -> v1.8.0 * github.com/xanzy/go-gitlab v0.37.0 -> v0.38.1 * mvdan.cc/xurls v2.1.0 -> v2.2.0 Co-authored-by: Lauris BH <lauris@nix.lv>
133 lines
2.8 KiB
Go
Vendored
133 lines
2.8 KiB
Go
Vendored
// Copyright 2014-2019 Ulrich Kunitz. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package lzma
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// literalCodec supports the encoding of literal. It provides 768 probability
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// values per literal state. The upper 512 probabilities are used with the
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// context of a match bit.
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type literalCodec struct {
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probs []prob
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}
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// deepcopy initializes literal codec c as a deep copy of the source.
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func (c *literalCodec) deepcopy(src *literalCodec) {
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if c == src {
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return
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}
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c.probs = make([]prob, len(src.probs))
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copy(c.probs, src.probs)
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}
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// init initializes the literal codec.
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func (c *literalCodec) init(lc, lp int) {
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switch {
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case !(minLC <= lc && lc <= maxLC):
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panic("lc out of range")
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case !(minLP <= lp && lp <= maxLP):
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panic("lp out of range")
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}
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c.probs = make([]prob, 0x300<<uint(lc+lp))
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for i := range c.probs {
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c.probs[i] = probInit
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}
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}
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// Encode encodes the byte s using a range encoder as well as the current LZMA
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// encoder state, a match byte and the literal state.
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func (c *literalCodec) Encode(e *rangeEncoder, s byte,
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state uint32, match byte, litState uint32,
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) (err error) {
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k := litState * 0x300
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probs := c.probs[k : k+0x300]
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symbol := uint32(1)
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r := uint32(s)
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if state >= 7 {
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m := uint32(match)
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for {
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matchBit := (m >> 7) & 1
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m <<= 1
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bit := (r >> 7) & 1
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r <<= 1
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i := ((1 + matchBit) << 8) | symbol
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if err = probs[i].Encode(e, bit); err != nil {
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return
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}
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symbol = (symbol << 1) | bit
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if matchBit != bit {
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break
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}
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if symbol >= 0x100 {
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break
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}
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}
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}
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for symbol < 0x100 {
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bit := (r >> 7) & 1
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r <<= 1
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if err = probs[symbol].Encode(e, bit); err != nil {
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return
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}
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symbol = (symbol << 1) | bit
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}
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return nil
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}
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// Decode decodes a literal byte using the range decoder as well as the LZMA
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// state, a match byte, and the literal state.
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func (c *literalCodec) Decode(d *rangeDecoder,
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state uint32, match byte, litState uint32,
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) (s byte, err error) {
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k := litState * 0x300
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probs := c.probs[k : k+0x300]
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symbol := uint32(1)
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if state >= 7 {
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m := uint32(match)
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for {
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matchBit := (m >> 7) & 1
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m <<= 1
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i := ((1 + matchBit) << 8) | symbol
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bit, err := d.DecodeBit(&probs[i])
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if err != nil {
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return 0, err
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}
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symbol = (symbol << 1) | bit
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if matchBit != bit {
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break
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}
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if symbol >= 0x100 {
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break
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}
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}
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}
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for symbol < 0x100 {
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bit, err := d.DecodeBit(&probs[symbol])
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if err != nil {
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return 0, err
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}
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symbol = (symbol << 1) | bit
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}
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s = byte(symbol - 0x100)
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return s, nil
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}
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// minLC and maxLC define the range for LC values.
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const (
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minLC = 0
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maxLC = 8
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)
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// minLC and maxLC define the range for LP values.
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const (
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minLP = 0
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maxLP = 4
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)
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// minState and maxState define a range for the state values stored in
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// the State values.
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const (
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minState = 0
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maxState = 11
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)
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