etcd-io__etcd/pkg/cpuutil/endian.go

// Copyright 2017 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package cpuutil

import (
	"encoding/binary"
	"unsafe"
)

const intWidth int = int(unsafe.Sizeof(0))

var byteOrder binary.ByteOrder

// ByteOrder returns the byte order for the CPU's native endianness.
func ByteOrder() binary.ByteOrder { return byteOrder }

func init() {
	i := int(0x1)
	if v := (*[intWidth]byte)(unsafe.Pointer(&i)); v[0] == 0 {
		byteOrder = binary.BigEndian
	} else {
		byteOrder = binary.LittleEndian
	}
}