go/hack/hack.go

package hack

import (
	"reflect"
	"unsafe"
)

// no copy to change slice to string
// use your own risk
func String(b []byte) (s string) {
	pbytes := (*reflect.SliceHeader)(unsafe.Pointer(&b))
	pstring := (*reflect.StringHeader)(unsafe.Pointer(&s))
	pstring.Data = pbytes.Data
	pstring.Len = pbytes.Len
	return
}

// no copy to change string to slice
// use your own risk
func Slice(s string) (b []byte) {
	pbytes := (*reflect.SliceHeader)(unsafe.Pointer(&b))
	pstring := (*reflect.StringHeader)(unsafe.Pointer(&s))
	pbytes.Data = pstring.Data
	pbytes.Len = pstring.Len
	pbytes.Cap = pstring.Len
	return
}

func Int64Slice(v int64) (b []byte) {
	pbytes := (*reflect.SliceHeader)(unsafe.Pointer(&b))
	pbytes.Data = uintptr(unsafe.Pointer(&v))
	pbytes.Len = 8
	pbytes.Cap = 8
	return
}

func Int32Slice(v int32) (b []byte) {
	pbytes := (*reflect.SliceHeader)(unsafe.Pointer(&b))
	pbytes.Data = uintptr(unsafe.Pointer(&v))
	pbytes.Len = 4
	pbytes.Cap = 4
	return
}