util: add Uint160DecodeBytesLE()

pkg/util/uint160.go

@@ -35,6 +35,20 @@ func Uint160DecodeBytesBE(b []byte) (u Uint160, err error) {
 	return
 }
 
+// Uint160DecodeBytesLE attempts to decode the given bytes in little-endian
+// into an Uint160.
+func Uint160DecodeBytesLE(b []byte) (u Uint160, err error) {
+	if len(b) != Uint160Size {
+		return u, fmt.Errorf("expected byte size of %d got %d", Uint160Size, len(b))
+	}
+
+	for i := range b {
+		u[Uint160Size-i-1] = b[i]
+	}
+
+	return
+}
+
 // BytesBE returns a big-endian byte representation of u.
 func (u Uint160) BytesBE() []byte {
 	return u[:]

pkg/util/uint160_test.go

@@ -52,6 +52,13 @@ func TestUint160DecodeBytes(t *testing.T) {
 	assert.NoError(t, err)
 	assert.Equal(t, hexStr, val.String())
 
+	valLE, err := Uint160DecodeBytesLE(b)
+	assert.NoError(t, err)
+	assert.Equal(t, val, valLE.Reverse())
+
+	_, err = Uint160DecodeBytesLE(b[1:])
+	assert.Error(t, err)
+
 	_, err = Uint160DecodeBytesBE(b[1:])
 	assert.Error(t, err)
 }