diff --git a/tools/utils/utf-8.go b/tools/utils/utf-8.go
new file mode 100644
index 000000000..ca25fca69
--- /dev/null
+++ b/tools/utils/utf-8.go
@@ -0,0 +1,68 @@
+package utils
+
+// UTF-8 decode taken from: https://bjoern.hoehrmann.de/utf-8/decoder/dfa/
+
+type UTF8State uint32
+
+var utf8_data []uint8 = []uint8{
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 00..1f
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 20..3f
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 40..5f
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 60..7f
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, // 80..9f
+	7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, // a0..bf
+	8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, // c0..df
+	0xa, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x3, 0x4, 0x3, 0x3, // e0..ef
+	0xb, 0x6, 0x6, 0x6, 0x5, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, 0x8, // f0..ff
+	0x0, 0x1, 0x2, 0x3, 0x5, 0x8, 0x7, 0x1, 0x1, 0x1, 0x4, 0x6, 0x1, 0x1, 0x1, 0x1, // s0..s0
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 1, 1, 1, 1, // s1..s2
+	1, 2, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, // s3..s4
+	1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, // s5..s6
+	1, 3, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // s7..s8
+}
+
+const (
+	UTF8_ACCEPT UTF8State = 0
+	UTF8_REJECT           = 1
+)
+
+func decode_utf8(state *UTF8State, codep *UTF8State, byte_ byte) UTF8State {
+	typ := UTF8State(utf8_data[byte_])
+	b := UTF8State(byte_)
+
+	if *state != UTF8_ACCEPT {
+		*codep = (b & 0x3f) | (*codep << 6)
+	} else {
+		*codep = (0xff >> typ) & (b)
+	}
+
+	idx := 256 + *state*16 + typ
+	*state = UTF8State(utf8_data[idx])
+	return *state
+}
+
+func encode_utf8(ch UTF8State, dest []byte) int {
+	if ch < 0x80 {
+		dest[0] = byte(ch)
+		return 1
+	}
+	if ch < 0x800 {
+		dest[0] = byte((ch >> 6) | 0xC0)
+		dest[1] = byte((ch & 0x3F) | 0x80)
+		return 2
+	}
+	if ch < 0x10000 {
+		dest[0] = byte((ch >> 12) | 0xE0)
+		dest[1] = byte(((ch >> 6) & 0x3F) | 0x80)
+		dest[2] = byte((ch & 0x3F) | 0x80)
+		return 3
+	}
+	if ch < 0x110000 {
+		dest[0] = byte((ch >> 18) | 0xF0)
+		dest[1] = byte(((ch >> 12) & 0x3F) | 0x80)
+		dest[2] = byte(((ch >> 6) & 0x3F) | 0x80)
+		dest[3] = byte((ch & 0x3F) | 0x80)
+		return 4
+	}
+	return 0
+}