From 4a9bd794bfd22aacb6546854001556374698399e Mon Sep 17 00:00:00 2001
From: Randy Reddig <randy@alta.software>
Date: Tue, 10 Aug 2021 02:11:49 -0700
Subject: [PATCH] quicvarint: export Min and Max (#3253)

---
 quicvarint/varint.go      |  6 ++++++
 quicvarint/varint_test.go | 10 ++++++++++
 2 files changed, 16 insertions(+)

diff --git a/quicvarint/varint.go b/quicvarint/varint.go
index 723c57c4b..66e0d39e6 100644
--- a/quicvarint/varint.go
+++ b/quicvarint/varint.go
@@ -9,6 +9,12 @@ import (
 
 // taken from the QUIC draft
 const (
+	// Min is the minimum value allowed for a QUIC varint.
+	Min = 0
+
+	// Max is the maximum allowed value for a QUIC varint (2^62-1).
+	Max = maxVarInt8
+
 	maxVarInt1 = 63
 	maxVarInt2 = 16383
 	maxVarInt4 = 1073741823
diff --git a/quicvarint/varint_test.go b/quicvarint/varint_test.go
index 9dc1ac06c..acf4a31c2 100644
--- a/quicvarint/varint_test.go
+++ b/quicvarint/varint_test.go
@@ -8,6 +8,16 @@ import (
 )
 
 var _ = Describe("Varint encoding / decoding", func() {
+	Context("limits", func() {
+		Specify("Min == 0", func() {
+			Expect(Min).To(Equal(0))
+		})
+
+		Specify("Max == 2^62-1", func() {
+			Expect(uint64(Max)).To(Equal(uint64(1<<62 - 1)))
+		})
+	})
+
 	Context("decoding", func() {
 		It("reads a 1 byte number", func() {
 			b := bytes.NewReader([]byte{0b00011001})