vendor

vendor/github.com/ulikunitz/xz/lzma/matchalgorithm.go

@@ -0,0 +1,52 @@
+// 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"
+
+// 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
+}