mirror of
https://github.com/go-gitea/gitea.git
synced 2024-12-04 14:46:57 -05:00
12a1f914f4
* 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.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package lzma
|
|
|
|
// literalCodec supports the encoding of literal. It provides 768 probability
|
|
// values per literal state. The upper 512 probabilities are used with the
|
|
// context of a match bit.
|
|
type literalCodec struct {
|
|
probs []prob
|
|
}
|
|
|
|
// deepcopy initializes literal codec c as a deep copy of the source.
|
|
func (c *literalCodec) deepcopy(src *literalCodec) {
|
|
if c == src {
|
|
return
|
|
}
|
|
c.probs = make([]prob, len(src.probs))
|
|
copy(c.probs, src.probs)
|
|
}
|
|
|
|
// init initializes the literal codec.
|
|
func (c *literalCodec) init(lc, lp int) {
|
|
switch {
|
|
case !(minLC <= lc && lc <= maxLC):
|
|
panic("lc out of range")
|
|
case !(minLP <= lp && lp <= maxLP):
|
|
panic("lp out of range")
|
|
}
|
|
c.probs = make([]prob, 0x300<<uint(lc+lp))
|
|
for i := range c.probs {
|
|
c.probs[i] = probInit
|
|
}
|
|
}
|
|
|
|
// Encode encodes the byte s using a range encoder as well as the current LZMA
|
|
// encoder state, a match byte and the literal state.
|
|
func (c *literalCodec) Encode(e *rangeEncoder, s byte,
|
|
state uint32, match byte, litState uint32,
|
|
) (err error) {
|
|
k := litState * 0x300
|
|
probs := c.probs[k : k+0x300]
|
|
symbol := uint32(1)
|
|
r := uint32(s)
|
|
if state >= 7 {
|
|
m := uint32(match)
|
|
for {
|
|
matchBit := (m >> 7) & 1
|
|
m <<= 1
|
|
bit := (r >> 7) & 1
|
|
r <<= 1
|
|
i := ((1 + matchBit) << 8) | symbol
|
|
if err = probs[i].Encode(e, bit); err != nil {
|
|
return
|
|
}
|
|
symbol = (symbol << 1) | bit
|
|
if matchBit != bit {
|
|
break
|
|
}
|
|
if symbol >= 0x100 {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
for symbol < 0x100 {
|
|
bit := (r >> 7) & 1
|
|
r <<= 1
|
|
if err = probs[symbol].Encode(e, bit); err != nil {
|
|
return
|
|
}
|
|
symbol = (symbol << 1) | bit
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Decode decodes a literal byte using the range decoder as well as the LZMA
|
|
// state, a match byte, and the literal state.
|
|
func (c *literalCodec) Decode(d *rangeDecoder,
|
|
state uint32, match byte, litState uint32,
|
|
) (s byte, err error) {
|
|
k := litState * 0x300
|
|
probs := c.probs[k : k+0x300]
|
|
symbol := uint32(1)
|
|
if state >= 7 {
|
|
m := uint32(match)
|
|
for {
|
|
matchBit := (m >> 7) & 1
|
|
m <<= 1
|
|
i := ((1 + matchBit) << 8) | symbol
|
|
bit, err := d.DecodeBit(&probs[i])
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
symbol = (symbol << 1) | bit
|
|
if matchBit != bit {
|
|
break
|
|
}
|
|
if symbol >= 0x100 {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
for symbol < 0x100 {
|
|
bit, err := d.DecodeBit(&probs[symbol])
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
symbol = (symbol << 1) | bit
|
|
}
|
|
s = byte(symbol - 0x100)
|
|
return s, nil
|
|
}
|
|
|
|
// minLC and maxLC define the range for LC values.
|
|
const (
|
|
minLC = 0
|
|
maxLC = 8
|
|
)
|
|
|
|
// minLC and maxLC define the range for LP values.
|
|
const (
|
|
minLP = 0
|
|
maxLP = 4
|
|
)
|
|
|
|
// minState and maxState define a range for the state values stored in
|
|
// the State values.
|
|
const (
|
|
minState = 0
|
|
maxState = 11
|
|
)
|