From f0bd7c3a9dd13bf69ddfcf6587e07bfa1d52a649 Mon Sep 17 00:00:00 2001
From: Anaminus <anaminus@protonmail.com>
Date: Tue, 14 Aug 2018 10:17:00 -0500
Subject: [PATCH] Remove dependency on satori/go.uuid (closes #6).

This package apparently has problems. Only a small subset of any such
package is needed anyway (generating V4 UUIDs). So instead of figuring
out which fork to use, it's much easier to just implement it directly.
---
 ref.go | 34 ++++++++++++++++++++++++++++++----
 1 file changed, 30 insertions(+), 4 deletions(-)

diff --git a/ref.go b/ref.go
index 2530dba..0036c24 100644
--- a/ref.go
+++ b/ref.go
@@ -1,9 +1,8 @@
 package rbxfile
 
 import (
-	"encoding/hex"
-	"github.com/satori/go.uuid"
-	"strings"
+	"crypto/rand"
+	"io"
 )
 
 // PropRef specifies the property of an instance that is a reference, which is
@@ -81,8 +80,35 @@ func IsEmptyReference(ref string) bool {
 	}
 }
 
+func hexEncode(dst, src []byte) {
+	const hextable = "0123456789ABCDEF"
+	for i := len(src) - 1; i >= 0; i-- {
+		dst[i*2+1] = hextable[src[i]&0x0f]
+		dst[i*2] = hextable[src[i]>>4]
+	}
+}
+
+func generateUUID() string {
+	var buf [36]byte
+	if _, err := io.ReadFull(rand.Reader, buf[:16]); err != nil {
+		panic(err)
+	}
+	buf[6] = (buf[6] & 0x0F) | 0x40 // Version 4       ; 0100XXXX
+	buf[8] = (buf[8] & 0x3F) | 0x80 // Variant RFC4122 ; 10XXXXXX
+	hexEncode(buf[24:36], buf[10:16])
+	buf[23] = '-'
+	hexEncode(buf[19:23], buf[8:10])
+	buf[18] = '-'
+	hexEncode(buf[14:18], buf[6:8])
+	buf[13] = '-'
+	hexEncode(buf[9:13], buf[4:6])
+	buf[8] = '-'
+	hexEncode(buf[0:8], buf[0:4])
+	return string(buf[:])
+}
+
 // GenerateReference generates a unique string that can be used as a reference
 // to an Instance.
 func GenerateReference() string {
-	return "RBX" + strings.ToUpper(hex.EncodeToString(uuid.NewV4().Bytes()))
+	return "RBX" + generateUUID()
 }