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gitea/vendor/github.com/ulikunitz/xz/lzma/properties.go
6543 12a1f914f4
Vendor Update Go Libs (#13166)
* 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>
2020-10-16 01:06:27 -04:00

70 lines
1.8 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
import (
"errors"
"fmt"
)
// maximum and minimum values for the LZMA properties.
const (
minPB = 0
maxPB = 4
)
// maxPropertyCode is the possible maximum of a properties code byte.
const maxPropertyCode = (maxPB+1)*(maxLP+1)*(maxLC+1) - 1
// Properties contains the parameters LC, LP and PB. The parameter LC
// defines the number of literal context bits; parameter LP the number
// of literal position bits and PB the number of position bits.
type Properties struct {
LC int
LP int
PB int
}
// String returns the properties in a string representation.
func (p *Properties) String() string {
return fmt.Sprintf("LC %d LP %d PB %d", p.LC, p.LP, p.PB)
}
// PropertiesForCode converts a properties code byte into a Properties value.
func PropertiesForCode(code byte) (p Properties, err error) {
if code > maxPropertyCode {
return p, errors.New("lzma: invalid properties code")
}
p.LC = int(code % 9)
code /= 9
p.LP = int(code % 5)
code /= 5
p.PB = int(code % 5)
return p, err
}
// verify checks the properties for correctness.
func (p *Properties) verify() error {
if p == nil {
return errors.New("lzma: properties are nil")
}
if !(minLC <= p.LC && p.LC <= maxLC) {
return errors.New("lzma: lc out of range")
}
if !(minLP <= p.LP && p.LP <= maxLP) {
return errors.New("lzma: lp out of range")
}
if !(minPB <= p.PB && p.PB <= maxPB) {
return errors.New("lzma: pb out of range")
}
return nil
}
// Code converts the properties to a byte. The function assumes that
// the properties components are all in range.
func (p Properties) Code() byte {
return byte((p.PB*5+p.LP)*9 + p.LC)
}