[#276] Merge repo with frostfs-api-go

Signed-off-by: Pavel Pogodaev <p.pogodaev@yadro.com>

api/refs/string.go

@@ -0,0 +1,47 @@
+package refs
+
+import (
+	refs "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/api/refs/grpc"
+)
+
+// String returns string representation of ChecksumType.
+func (t ChecksumType) String() string {
+	return ChecksumTypeToGRPC(t).String()
+}
+
+// FromString parses ChecksumType from a string representation.
+// It is a reverse action to String().
+//
+// Returns true if s was parsed successfully.
+func (t *ChecksumType) FromString(s string) bool {
+	var g refs.ChecksumType
+
+	ok := g.FromString(s)
+
+	if ok {
+		*t = ChecksumTypeFromGRPC(g)
+	}
+
+	return ok
+}
+
+// String returns string representation of SignatureScheme.
+func (t SignatureScheme) String() string {
+	return refs.SignatureScheme(t).String()
+}
+
+// FromString parses SignatureScheme from a string representation.
+// It is a reverse action to String().
+//
+// Returns true if s was parsed successfully.
+func (t *SignatureScheme) FromString(s string) bool {
+	var g refs.SignatureScheme
+
+	ok := g.FromString(s)
+
+	if ok {
+		*t = SignatureScheme(g)
+	}
+
+	return ok
+}