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package kcp
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import (
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"github.com/v2ray/v2ray-core/common"
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"github.com/v2ray/v2ray-core/common/alloc"
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_ "github.com/v2ray/v2ray-core/common/log"
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"github.com/v2ray/v2ray-core/common/serial"
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)
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type SegmentCommand byte
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const (
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SegmentCommandACK SegmentCommand = 0
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SegmentCommandData SegmentCommand = 1
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SegmentCommandTerminated SegmentCommand = 2
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SegmentCommandPing SegmentCommand = 3
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)
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type SegmentOption byte
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const (
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SegmentOptionClose SegmentOption = 1
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)
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type ISegment interface {
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common.Releasable
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ByteSize() int
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Bytes([]byte) []byte
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}
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type DataSegment struct {
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Conv uint16
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Opt SegmentOption
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Timestamp uint32
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Number uint32
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SendingNext uint32
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Data *alloc.Buffer
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timeout uint32
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ackSkipped uint32
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transmit uint32
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}
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func (this *DataSegment) Bytes(b []byte) []byte {
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b = serial.Uint16ToBytes(this.Conv, b)
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b = append(b, byte(SegmentCommandData), byte(this.Opt))
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b = serial.Uint32ToBytes(this.Timestamp, b)
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b = serial.Uint32ToBytes(this.Number, b)
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b = serial.Uint32ToBytes(this.SendingNext, b)
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b = serial.Uint16ToBytes(uint16(this.Data.Len()), b)
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b = append(b, this.Data.Value...)
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return b
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}
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func (this *DataSegment) ByteSize() int {
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return 2 + 1 + 1 + 4 + 4 + 4 + 2 + this.Data.Len()
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}
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func (this *DataSegment) Release() {
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this.Data.Release()
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}
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type ACKSegment struct {
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Conv uint16
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Opt SegmentOption
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ReceivingWindow uint32
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ReceivingNext uint32
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Count byte
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NumberList []uint32
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TimestampList []uint32
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}
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func (this *ACKSegment) ByteSize() int {
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return 2 + 1 + 1 + 4 + 4 + 1 + int(this.Count)*4 + int(this.Count)*4
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}
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func (this *ACKSegment) Bytes(b []byte) []byte {
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b = serial.Uint16ToBytes(this.Conv, b)
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b = append(b, byte(SegmentCommandACK), byte(this.Opt))
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b = serial.Uint32ToBytes(this.ReceivingWindow, b)
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b = serial.Uint32ToBytes(this.ReceivingNext, b)
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b = append(b, this.Count)
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for i := byte(0); i < this.Count; i++ {
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b = serial.Uint32ToBytes(this.NumberList[i], b)
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b = serial.Uint32ToBytes(this.TimestampList[i], b)
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}
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return b
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}
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func (this *ACKSegment) Release() {}
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type CmdOnlySegment struct {
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Conv uint16
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Cmd SegmentCommand
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Opt SegmentOption
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SendingNext uint32
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ReceivinNext uint32
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}
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func (this *CmdOnlySegment) ByteSize() int {
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return 2 + 1 + 1 + 4 + 4
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}
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func (this *CmdOnlySegment) Bytes(b []byte) []byte {
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b = serial.Uint16ToBytes(this.Conv, b)
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b = append(b, byte(this.Cmd), byte(this.Opt))
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b = serial.Uint32ToBytes(this.SendingNext, b)
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b = serial.Uint32ToBytes(this.ReceivinNext, b)
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return b
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}
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func (this *CmdOnlySegment) Release() {}
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func ReadSegment(buf []byte) (ISegment, []byte) {
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if len(buf) <= 6 {
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return nil, nil
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}
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conv := serial.BytesToUint16(buf)
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buf = buf[2:]
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cmd := SegmentCommand(buf[0])
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opt := SegmentOption(buf[1])
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buf = buf[2:]
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if cmd == SegmentCommandData {
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seg := &DataSegment{
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Conv: conv,
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Opt: opt,
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}
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seg.Timestamp = serial.BytesToUint32(buf)
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buf = buf[4:]
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seg.Number = serial.BytesToUint32(buf)
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buf = buf[4:]
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seg.SendingNext = serial.BytesToUint32(buf)
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buf = buf[4:]
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len := serial.BytesToUint16(buf)
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buf = buf[2:]
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seg.Data = alloc.NewSmallBuffer().Clear().Append(buf[:len])
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buf = buf[len:]
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return seg, buf
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}
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if cmd == SegmentCommandACK {
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seg := &ACKSegment{
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Conv: conv,
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Opt: opt,
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}
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seg.ReceivingWindow = serial.BytesToUint32(buf)
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buf = buf[4:]
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seg.ReceivingNext = serial.BytesToUint32(buf)
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buf = buf[4:]
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seg.Count = buf[0]
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buf = buf[1:]
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seg.NumberList = make([]uint32, 0, seg.Count)
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seg.TimestampList = make([]uint32, 0, seg.Count)
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for i := 0; i < int(seg.Count); i++ {
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seg.NumberList = append(seg.NumberList, serial.BytesToUint32(buf))
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seg.TimestampList = append(seg.TimestampList, serial.BytesToUint32(buf[4:]))
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buf = buf[8:]
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}
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return seg, buf
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}
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seg := &CmdOnlySegment{
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Conv: conv,
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Cmd: cmd,
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Opt: opt,
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}
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seg.SendingNext = serial.BytesToUint32(buf)
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buf = buf[4:]
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seg.ReceivinNext = serial.BytesToUint32(buf)
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buf = buf[4:]
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return seg, buf
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}
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