You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
53 lines
1.2 KiB
53 lines
1.2 KiB
// 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 "errors"
|
|
|
|
// MatchAlgorithm identifies an algorithm to find matches in the
|
|
// dictionary.
|
|
type MatchAlgorithm byte
|
|
|
|
// Supported matcher algorithms.
|
|
const (
|
|
HashTable4 MatchAlgorithm = iota
|
|
BinaryTree
|
|
)
|
|
|
|
// maStrings are used by the String method.
|
|
var maStrings = map[MatchAlgorithm]string{
|
|
HashTable4: "HashTable4",
|
|
BinaryTree: "BinaryTree",
|
|
}
|
|
|
|
// String returns a string representation of the Matcher.
|
|
func (a MatchAlgorithm) String() string {
|
|
if s, ok := maStrings[a]; ok {
|
|
return s
|
|
}
|
|
return "unknown"
|
|
}
|
|
|
|
var errUnsupportedMatchAlgorithm = errors.New(
|
|
"lzma: unsupported match algorithm value")
|
|
|
|
// verify checks whether the matcher value is supported.
|
|
func (a MatchAlgorithm) verify() error {
|
|
if _, ok := maStrings[a]; !ok {
|
|
return errUnsupportedMatchAlgorithm
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (a MatchAlgorithm) new(dictCap int) (m matcher, err error) {
|
|
switch a {
|
|
case HashTable4:
|
|
return newHashTable(dictCap, 4)
|
|
case BinaryTree:
|
|
return newBinTree(dictCap)
|
|
}
|
|
return nil, errUnsupportedMatchAlgorithm
|
|
}
|