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forgejo/vendor/github.com/ulikunitz/xz/lzma/operation.go

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2021-03-01 00:08:33 +01:00
// Copyright 2014-2021 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 (
"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
}
// 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)
}