chore: decrease shadowsocks udp read memory used for no-windows platform

common/net/packet.go

@@ -4,69 +4,14 @@ import (
 	"net"
 	"sync"
 
-	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/common/net/deadline"
+	"github.com/Dreamacro/clash/common/net/packet"
 )
 
-type EnhancePacketConn interface {
-	net.PacketConn
-	WaitReadFrom() (data []byte, put func(), addr net.Addr, err error)
-	Upstream() any
-}
+type EnhancePacketConn = packet.EnhancePacketConn
 
-func NewEnhancePacketConn(pc net.PacketConn) EnhancePacketConn {
-	if udpConn, isUDPConn := pc.(*net.UDPConn); isUDPConn {
-		return &enhanceUDPConn{UDPConn: udpConn}
-	}
-	return &enhancePacketConn{PacketConn: pc}
-}
-
-type enhancePacketConn struct {
-	net.PacketConn
-}
-
-func (c *enhancePacketConn) WaitReadFrom() (data []byte, put func(), addr net.Addr, err error) {
-	return waitReadFrom(c.PacketConn)
-}
-
-func (c *enhancePacketConn) Upstream() any {
-	return c.PacketConn
-}
-
-func (c *enhancePacketConn) WriterReplaceable() bool {
-	return true
-}
-
-func (c *enhancePacketConn) ReaderReplaceable() bool {
-	return true
-}
-
-func (c *enhanceUDPConn) Upstream() any {
-	return c.UDPConn
-}
-
-func (c *enhanceUDPConn) WriterReplaceable() bool {
-	return true
-}
-
-func (c *enhanceUDPConn) ReaderReplaceable() bool {
-	return true
-}
-
-func waitReadFrom(pc net.PacketConn) (data []byte, put func(), addr net.Addr, err error) {
-	readBuf := pool.Get(pool.UDPBufferSize)
-	put = func() {
-		_ = pool.Put(readBuf)
-	}
-	var readN int
-	readN, addr, err = pc.ReadFrom(readBuf)
-	if readN > 0 {
-		data = readBuf[:readN]
-	} else {
-		put()
-		put = nil
-	}
-	return
-}
+var NewEnhancePacketConn = packet.NewEnhancePacketConn
+var NewDeadlinePacketConn = deadline.NewPacketConn
 
 type threadSafePacketConn struct {
 	net.PacketConn