| // Copyright Istio 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 validation |
| |
| import ( |
| "encoding/binary" |
| "unsafe" |
| ) |
| |
| var nativeByteOrder binary.ByteOrder |
| |
| func init() { |
| var x uint16 = 0x0102 |
| lowerByte := *(*byte)(unsafe.Pointer(&x)) |
| switch lowerByte { |
| case 0x01: |
| nativeByteOrder = binary.BigEndian |
| case 0x02: |
| nativeByteOrder = binary.LittleEndian |
| default: |
| panic("Could not determine native byte order.") |
| } |
| } |
| |
| // <arpa/inet.h> |
| func ntohs(n16 uint16) uint16 { |
| if nativeByteOrder == binary.BigEndian { |
| return n16 |
| } |
| return (n16&0xff00)>>8 | (n16&0xff)<<8 |
| } |
