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add support for NACK ranges when writing ACK frames

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This commit is contained in:
Marten Seemann 2016-04-20 11:57:09 +07:00
parent b084faff88
commit c455ae0a05
4 changed files with 175 additions and 34 deletions
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36
frames/ack_frame.go
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@ -19,14 +19,44 @@ type AckFrame struct {
// Write writes an ACK frame.
func (f *AckFrame) Write(b *bytes.Buffer) error {
typeByte := uint8(0x48)
typeByte := uint8(0x40 | 0x0C)
if f.HasNACK() {
typeByte |= (0x20 | 0x03)
}
b.WriteByte(typeByte)
b.WriteByte(f.Entropy)
utils.WriteUint32(b, uint32(f.LargestObserved)) // TODO: send the correct length
utils.WriteUint48(b, uint64(f.LargestObserved)) // TODO: send the correct length
utils.WriteUint16(b, 1) // TODO: Ack delay time
b.WriteByte(0x01) // Just one timestamp
b.WriteByte(0x00) // Largest observed
b.WriteByte(0x00) // Delta Largest observed
utils.WriteUint32(b, 0) // First timestamp
if f.HasNACK() {
numRanges := uint8(len(f.NackRanges))
b.WriteByte(numRanges)
for i, nackRange := range f.NackRanges {
var missingPacketSequenceNumberDelta uint64
if i == 0 {
if protocol.PacketNumber(uint64(nackRange.FirstPacketNumber)+uint64(nackRange.Length)) > f.LargestObserved {
return errors.New("AckFrame: Invalid NACK ranges")
}
missingPacketSequenceNumberDelta = uint64(f.LargestObserved-nackRange.FirstPacketNumber) - uint64(nackRange.Length) + 1
} else {
lastNackRange := f.NackRanges[i-1]
missingPacketSequenceNumberDelta = uint64(lastNackRange.FirstPacketNumber-nackRange.FirstPacketNumber) - uint64(nackRange.Length)
}
rangeLength := nackRange.Length - 1
if rangeLength > 255 {
return errors.New("AckFrame: NACK ranges larger 256 packets not yet supported")
}
utils.WriteUint48(b, missingPacketSequenceNumberDelta)
b.WriteByte(rangeLength)
}
}
return nil
}