initial import

Signed-off-by: Vasiliy Tolstov <v.tolstov@selfip.ru>

hash/hash.go

@@ -0,0 +1,34 @@
+package hash
+
+import (
+	"fmt"
+	"hash"
+	"strings"
+)
+
+var hashTypes map[string]hash.Hash
+
+func init() {
+	hashTypes = make(map[string]hash.Hash)
+}
+
+func RegisterHash(engine string, hash hash.Hash) {
+	hashTypes[engine] = hash
+}
+
+func New(htype string) (hash.Hash, error) {
+	hash, ok := hashTypes[htype]
+	if !ok {
+		return nil, fmt.Errorf("unknown hash type %s. only %s supported", htype, strings.Join(HashTypes(), ","))
+	}
+
+	return hash, nil
+}
+
+func HashTypes() []string {
+	var htypes []string
+	for htype, _ := range hashTypes {
+		htypes = append(htypes, htype)
+	}
+	return htypes
+}

hash/xxhash/xxhash.go

@@ -0,0 +1,11 @@
+package xxhash
+
+import (
+	"github.com/OneOfOne/xxhash"
+
+	"github.com/sdstack/storage/hash"
+)
+
+func init() {
+	hash.RegisterHash("xxhash", &xxhash.XXHash64{})
+}