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// 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.
//go:build go1.21
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
}
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