From 72fe884faab237ffe8f5f7ccef6ed939285e9fd4 Mon Sep 17 00:00:00 2001
From: Evgenii Stratonikov <evgeniy@nspcc.ru>
Date: Tue, 3 Dec 2019 16:14:44 +0300
Subject: [PATCH] util: add Uint160DecodeStringLE()

---
 pkg/util/uint160.go      | 16 ++++++++++++++++
 pkg/util/uint160_test.go | 10 ++++++++++
 2 files changed, 26 insertions(+)

diff --git a/pkg/util/uint160.go b/pkg/util/uint160.go
index 9e63f4dce..151685a57 100644
--- a/pkg/util/uint160.go
+++ b/pkg/util/uint160.go
@@ -26,6 +26,22 @@ func Uint160DecodeStringBE(s string) (Uint160, error) {
 	return Uint160DecodeBytesBE(b)
 }
 
+// Uint160DecodeStringLE attempts to decode the given string
+// in little-endian hex encoding into an Uint160.
+func Uint160DecodeStringLE(s string) (Uint160, error) {
+	var u Uint160
+	if len(s) != Uint160Size*2 {
+		return u, fmt.Errorf("expected string size of %d got %d", Uint160Size*2, len(s))
+	}
+
+	b, err := hex.DecodeString(s)
+	if err != nil {
+		return u, err
+	}
+
+	return Uint160DecodeBytesLE(b)
+}
+
 // Uint160DecodeBytesBE attempts to decode the given bytes into an Uint160.
 func Uint160DecodeBytesBE(b []byte) (u Uint160, err error) {
 	if len(b) != Uint160Size {
diff --git a/pkg/util/uint160_test.go b/pkg/util/uint160_test.go
index 96edcca3a..c5c978a96 100644
--- a/pkg/util/uint160_test.go
+++ b/pkg/util/uint160_test.go
@@ -35,12 +35,22 @@ func TestUInt160DecodeString(t *testing.T) {
 	assert.NoError(t, err)
 	assert.Equal(t, hexStr, val.String())
 
+	valLE, err := Uint160DecodeStringLE(hexStr)
+	assert.NoError(t, err)
+	assert.Equal(t, val, valLE.Reverse())
+
 	_, err = Uint160DecodeStringBE(hexStr[1:])
 	assert.Error(t, err)
 
+	_, err = Uint160DecodeStringLE(hexStr[1:])
+	assert.Error(t, err)
+
 	hexStr = "zz3b96ae1bcc5a585e075e3b81920210dec16302"
 	_, err = Uint160DecodeStringBE(hexStr)
 	assert.Error(t, err)
+
+	_, err = Uint160DecodeStringLE(hexStr)
+	assert.Error(t, err)
 }
 
 func TestUint160DecodeBytes(t *testing.T) {