1 files changed, 26 insertions, 0 deletions
diff --git a/src/vendor/golang.org/x/net/quic/ack_delay.go b/src/vendor/golang.org/x/net/quic/ack_delay.go
new file mode 100644
index 0000000000..029ce6faec
--- /dev/null
+++ b/src/vendor/golang.org/x/net/quic/ack_delay.go
@@ -0,0 +1,26 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quic
+
+import (
+	"math"
+	"time"
+)
+
+// An unscaledAckDelay is an ACK Delay field value from an ACK packet,
+// without the ack_delay_exponent scaling applied.
+type unscaledAckDelay int64
+
+func unscaledAckDelayFromDuration(d time.Duration, ackDelayExponent uint8) unscaledAckDelay {
+	return unscaledAckDelay(d.Microseconds() >> ackDelayExponent)
+}
+
+func (d unscaledAckDelay) Duration(ackDelayExponent uint8) time.Duration {
+	if int64(d) > (math.MaxInt64>>ackDelayExponent)/int64(time.Microsecond) {
+		// If scaling the delay would overflow, ignore the delay.
+		return 0
+	}
+	return time.Duration(d<<ackDelayExponent) * time.Microsecond
+}