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package wire
import (
"math"
"time"
"github.com/quic-go/quic-go/internal/protocol"
"github.com/quic-go/quic-go/quicvarint"
)
type AckFrequencyFrame struct {
SequenceNumber uint64
AckElicitingThreshold uint64
RequestMaxAckDelay time.Duration
ReorderingThreshold protocol.PacketNumber
}
func parseAckFrequencyFrame(b []byte, _ protocol.Version) (*AckFrequencyFrame, int, error) {
startLen := len(b)
seq, l, err := quicvarint.Parse(b)
if err != nil {
return nil, 0, replaceUnexpectedEOF(err)
}
b = b[l:]
aeth, l, err := quicvarint.Parse(b)
if err != nil {
return nil, 0, replaceUnexpectedEOF(err)
}
b = b[l:]
mad, l, err := quicvarint.Parse(b)
if err != nil {
return nil, 0, replaceUnexpectedEOF(err)
}
// prevents overflows if the peer sends a very large value
maxAckDelay := time.Duration(mad) * time.Microsecond
if maxAckDelay < 0 {
maxAckDelay = math.MaxInt64
}
b = b[l:]
rth, l, err := quicvarint.Parse(b)
if err != nil {
return nil, 0, replaceUnexpectedEOF(err)
}
b = b[l:]
return &AckFrequencyFrame{
SequenceNumber: seq,
AckElicitingThreshold: aeth,
RequestMaxAckDelay: maxAckDelay,
ReorderingThreshold: protocol.PacketNumber(rth),
}, startLen - len(b), nil
}
func (f *AckFrequencyFrame) Append(b []byte, _ protocol.Version) ([]byte, error) {
b = quicvarint.Append(b, uint64(FrameTypeAckFrequency))
b = quicvarint.Append(b, f.SequenceNumber)
b = quicvarint.Append(b, f.AckElicitingThreshold)
b = quicvarint.Append(b, uint64(f.RequestMaxAckDelay/time.Microsecond))
return quicvarint.Append(b, uint64(f.ReorderingThreshold)), nil
}
func (f *AckFrequencyFrame) Length(_ protocol.Version) protocol.ByteCount {
return protocol.ByteCount(2 + quicvarint.Len(f.SequenceNumber) + quicvarint.Len(f.AckElicitingThreshold) +
quicvarint.Len(uint64(f.RequestMaxAckDelay/time.Microsecond)) + quicvarint.Len(uint64(f.ReorderingThreshold)))
}
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