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53 lines
1.2 KiB
53 lines
1.2 KiB
4 years ago
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// Copyright 2014-2017 Ulrich Kunitz. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package lzma
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import "errors"
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// MatchAlgorithm identifies an algorithm to find matches in the
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// dictionary.
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type MatchAlgorithm byte
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// Supported matcher algorithms.
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const (
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HashTable4 MatchAlgorithm = iota
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BinaryTree
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)
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// maStrings are used by the String method.
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var maStrings = map[MatchAlgorithm]string{
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HashTable4: "HashTable4",
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BinaryTree: "BinaryTree",
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}
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// String returns a string representation of the Matcher.
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func (a MatchAlgorithm) String() string {
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if s, ok := maStrings[a]; ok {
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return s
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}
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return "unknown"
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}
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var errUnsupportedMatchAlgorithm = errors.New(
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"lzma: unsupported match algorithm value")
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// verify checks whether the matcher value is supported.
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func (a MatchAlgorithm) verify() error {
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if _, ok := maStrings[a]; !ok {
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return errUnsupportedMatchAlgorithm
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}
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return nil
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}
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func (a MatchAlgorithm) new(dictCap int) (m matcher, err error) {
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switch a {
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case HashTable4:
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return newHashTable(dictCap, 4)
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case BinaryTree:
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return newBinTree(dictCap)
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}
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return nil, errUnsupportedMatchAlgorithm
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}
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