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add Frame.MaxLength and implement it for currently needed frames

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This commit is contained in:
Lucas Clemente 2016-04-20 15:06:10 +02:00
parent 93cea4f5de
commit 6be70bc29c
7 changed files with 70 additions and 1 deletions
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12
frames/ack_frame.go
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@ -65,6 +65,16 @@ func (f *AckFrame) Write(b *bytes.Buffer) error {
return nil
}
// MaxLength of a written frame
func (f *AckFrame) MaxLength() int {
l := 1 + 1 + 6 + 2 + 1 + 1 + 4
l += (1 + 2) * 0 /* TODO: num_timestamps */
if f.HasNACK() {
l += 1 + (6+1)*len(f.NackRanges)
}
return l
}
// HasNACK returns if the frame has NACK ranges
func (f *AckFrame) HasNACK() bool {
if len(f.NackRanges) > 0 {
@ -180,7 +190,7 @@ func ParseAckFrame(r *bytes.Reader) (*AckFrame, error) {
nackRange.FirstPacketNumber = frame.LargestObserved - protocol.PacketNumber(missingPacketSequenceNumberDelta+uint64(rangeLength))
} else {
if missingPacketSequenceNumberDelta == 0 {
return nil, errors.New("ACK frame: Continues NACK ranges not yet implemented.")
return nil, errors.New("ACK frame: Continues NACK ranges not yet implemented")
}
lastNackRange := frame.NackRanges[len(frame.NackRanges)-1]
nackRange.FirstPacketNumber = lastNackRange.FirstPacketNumber - protocol.PacketNumber(missingPacketSequenceNumberDelta+uint64(rangeLength)) - 1