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never send 1-byte packet numbers

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This commit is contained in:
Marten Seemann
2016-08-25 12:34:55 +07:00
parent 9bd9c8aa54
commit eabd38238a
3 changed files with 13 additions and 15 deletions
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2
packet_packer_test.go
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@@ -31,7 +31,7 @@ var _ = Describe("Packet packer", func() {
packetNumberGenerator: newPacketNumberGenerator(protocol.SkipPacketAveragePeriodLength),
streamFramer: streamFramer,
}
publicHeaderLen = 1 + 8 + 1 // 1 flag byte, 8 connection ID, 1 packet number
publicHeaderLen = 1 + 8 + 2 // 1 flag byte, 8 connection ID, 2 packet number
packer.version = protocol.Version34
})

4
protocol/packet_number.go
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@@ -28,11 +28,9 @@ func delta(a, b PacketNumber) PacketNumber {
}
// GetPacketNumberLengthForPublicHeader gets the length of the packet number for the public header
// it never chooses a PacketNumberLen of 1 byte, since this is too short under certain circumstances
func GetPacketNumberLengthForPublicHeader(packetNumber PacketNumber, leastUnacked PacketNumber) PacketNumberLen {
diff := uint64(packetNumber - leastUnacked)
if diff < (2 << (uint8(PacketNumberLen1)*8 - 2)) {
return PacketNumberLen1
}
if diff < (2 << (uint8(PacketNumberLen2)*8 - 2)) {
return PacketNumberLen2
}

22
protocol/packet_number_test.go
View File

@@ -128,20 +128,20 @@ var _ = Describe("packet number calculation", func() {
Context("shortening a packet number for the publicHeader", func() {
Context("shortening", func() {
It("sends out low packet numbers as 1 byte", func() {
It("sends out low packet numbers as 2 byte", func() {
length := GetPacketNumberLengthForPublicHeader(4, 2)
Expect(length).To(Equal(PacketNumberLen1))
})
It("sends out high packet numbers as 1 byte, if all ACKs are received", func() {
length := GetPacketNumberLengthForPublicHeader(0xDEADBEEF, 0xDEADBEEF-1)
Expect(length).To(Equal(PacketNumberLen1))
})
It("sends out higher packet numbers as 2 bytes, if a lot of ACKs are missing", func() {
length := GetPacketNumberLengthForPublicHeader(200, 2)
Expect(length).To(Equal(PacketNumberLen2))
})
It("sends out high packet numbers as 2 byte, if all ACKs are received", func() {
length := GetPacketNumberLengthForPublicHeader(0xDEADBEEF, 0xDEADBEEF-1)
Expect(length).To(Equal(PacketNumberLen2))
})
It("sends out higher packet numbers as 4 bytes, if a lot of ACKs are missing", func() {
length := GetPacketNumberLengthForPublicHeader(40000, 2)
Expect(length).To(Equal(PacketNumberLen4))
})
})
Context("self-consistency", func() {