From 77cb1ea6d8a3e1f8d54dbcf2690034bf3aa83a83 Mon Sep 17 00:00:00 2001
From: Ashley Svetlik <ash.svetlik@gmail.com>
Date: Fri, 14 Jun 2019 13:44:04 -0500
Subject: [PATCH] Claified the arithmetic behind the max op.value

---
 roaring/roaring.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/roaring/roaring.go b/roaring/roaring.go
index 31916445f..f1593df9c 100644
--- a/roaring/roaring.go
+++ b/roaring/roaring.go
@@ -3961,7 +3961,10 @@ func (op *op) UnmarshalBinary(data []byte) error {
 	_, _ = h.Write(data[0:9])
 
 	if op.typ > 1 {
-		if 1152921504606847000 < int(op.value) {
+		// The maximum integer value for a int64 is 9223372036854775807
+		maxInt := 9223372036854775807
+		maxOpValue := maxInt/8-13
+		if maxOpValue < int(op.value) {
 			return fmt.Errorf("too big")
 		}
 		if len(data) < int(13+op.value*8) {