gitea/vendor/github.com/ulikunitz/xz/lzma/operation.go
PhilippHomann 684b7a999f
Dump: add output format tar and output to stdout (#10376)
* Dump: Use mholt/archive/v3 to support tar including many compressions

Signed-off-by: Philipp Homann <homann.philipp@googlemail.com>

* Dump: Allow dump output to stdout

Signed-off-by: Philipp Homann <homann.philipp@googlemail.com>

* Dump: Fixed bug present since #6677 where SessionConfig.Provider is never "file"

Signed-off-by: Philipp Homann <homann.philipp@googlemail.com>

* Dump: never pack RepoRootPath, LFS.ContentPath and LogRootPath when they are below AppDataPath

Signed-off-by: Philipp Homann <homann.philipp@googlemail.com>

* Dump: also dump LFS (fixes #10058)

Signed-off-by: Philipp Homann <homann.philipp@googlemail.com>

* Dump: never dump CustomPath if CustomPath is a subdir of or equal to AppDataPath (fixes #10365)

Signed-off-by: Philipp Homann <homann.philipp@googlemail.com>

* Use log.Info instead of fmt.Fprintf

Signed-off-by: Philipp Homann <homann.philipp@googlemail.com>

* import ordering

* make fmt

Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: Matti R <matti@mdranta.net>
2020-06-05 16:47:39 -04:00

81 lines
1.8 KiB
Go

// Copyright 2014-2017 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"
"unicode"
)
// operation represents an operation on the dictionary during encoding or
// decoding.
type operation interface {
Len() int
}
// rep represents a repetition at the given distance and the given length
type match struct {
// supports all possible distance values, including the eos marker
distance int64
// length
n int
}
// verify checks whether the match is valid. If that is not the case an
// error is returned.
func (m match) verify() error {
if !(minDistance <= m.distance && m.distance <= maxDistance) {
return errors.New("distance out of range")
}
if !(1 <= m.n && m.n <= maxMatchLen) {
return errors.New("length out of range")
}
return nil
}
// l return the l-value for the match, which is the difference of length
// n and 2.
func (m match) l() uint32 {
return uint32(m.n - minMatchLen)
}
// dist returns the dist value for the match, which is one less of the
// distance stored in the match.
func (m match) dist() uint32 {
return uint32(m.distance - minDistance)
}
// Len returns the number of bytes matched.
func (m match) Len() int {
return m.n
}
// String returns a string representation for the repetition.
func (m match) String() string {
return fmt.Sprintf("M{%d,%d}", m.distance, m.n)
}
// lit represents a single byte literal.
type lit struct {
b byte
}
// Len returns 1 for the single byte literal.
func (l lit) Len() int {
return 1
}
// String returns a string representation for the literal.
func (l lit) String() string {
var c byte
if unicode.IsPrint(rune(l.b)) {
c = l.b
} else {
c = '.'
}
return fmt.Sprintf("L{%c/%02x}", c, l.b)
}