| // 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 |
| } |
| } |