add go-tun2socks code

core/buffer_pool.go

@@ -0,0 +1,35 @@
+package core
+
+import (
+	"sync"
+)
+
+var pool *sync.Pool
+
+const BufSize = 2 * 1024
+
+func SetBufferPool(p *sync.Pool) {
+	pool = p
+}
+
+func NewBytes(size int) []byte {
+	if size <= BufSize {
+		return pool.Get().([]byte)
+	} else {
+		return make([]byte, size)
+	}
+}
+
+func FreeBytes(b []byte) {
+	if len(b) >= BufSize {
+		pool.Put(b)
+	}
+}
+
+func init() {
+	SetBufferPool(&sync.Pool{
+		New: func() interface{} {
+			return make([]byte, BufSize)
+		},
+	})
+}