feat: impl. new protol design & new head

internal/bin/data.go

@@ -0,0 +1,45 @@
+package bin
+
+import (
+	"encoding/binary"
+	"reflect"
+	"unsafe"
+)
+
+// IsLittleEndian judge by binary packet.
+var IsLittleEndian = reflect.ValueOf(&binary.NativeEndian).Elem().Field(0).Type().String() == "binary.littleEndian"
+
+// slice is the runtime representation of a slice.
+// It cannot be used safely or portably and its representation may
+// change in a later release.
+//
+// Unlike reflect.SliceHeader, its Data field is sufficient to guarantee the
+// data it references will not be garbage collected.
+type slice struct {
+	data unsafe.Pointer
+	len  int
+	cap  int
+}
+
+// BytesToString 没有内存开销的转换
+func BytesToString(b []byte) string {
+	return *(*string)(unsafe.Pointer(&b))
+}
+
+// StringToBytes 没有内存开销的转换
+func StringToBytes(s string) (b []byte) {
+	bh := (*slice)(unsafe.Pointer(&b))
+	sh := (*slice)(unsafe.Pointer(&s)) // 不要访问 sh.cap
+	bh.data = sh.data
+	bh.len = sh.len
+	bh.cap = sh.len
+	return b
+}
+
+func IsNilInterface(x any) bool {
+	return x == nil || reflect.ValueOf(x).IsZero()
+}
+
+func IsNonNilInterface(x any) bool {
+	return !IsNilInterface(x)
+}