1// Copyright 2016 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5// +build darwin dragonfly freebsd netbsd openbsd 6 7package route 8 9// This file contains duplicates of encoding/binary package. 10// 11// This package is supposed to be used by the net package of standard 12// library. Therefore the package set used in the package must be the 13// same as net package. 14 15var ( 16 littleEndian binaryLittleEndian 17 bigEndian binaryBigEndian 18) 19 20type binaryByteOrder interface { 21 Uint16([]byte) uint16 22 Uint32([]byte) uint32 23 PutUint16([]byte, uint16) 24 PutUint32([]byte, uint32) 25 Uint64([]byte) uint64 26} 27 28type binaryLittleEndian struct{} 29 30func (binaryLittleEndian) Uint16(b []byte) uint16 { 31 _ = b[1] // bounds check hint to compiler; see golang.org/issue/14808 32 return uint16(b[0]) | uint16(b[1])<<8 33} 34 35func (binaryLittleEndian) PutUint16(b []byte, v uint16) { 36 _ = b[1] // early bounds check to guarantee safety of writes below 37 b[0] = byte(v) 38 b[1] = byte(v >> 8) 39} 40 41func (binaryLittleEndian) Uint32(b []byte) uint32 { 42 _ = b[3] // bounds check hint to compiler; see golang.org/issue/14808 43 return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24 44} 45 46func (binaryLittleEndian) PutUint32(b []byte, v uint32) { 47 _ = b[3] // early bounds check to guarantee safety of writes below 48 b[0] = byte(v) 49 b[1] = byte(v >> 8) 50 b[2] = byte(v >> 16) 51 b[3] = byte(v >> 24) 52} 53 54func (binaryLittleEndian) Uint64(b []byte) uint64 { 55 _ = b[7] // bounds check hint to compiler; see golang.org/issue/14808 56 return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 | 57 uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56 58} 59 60type binaryBigEndian struct{} 61 62func (binaryBigEndian) Uint16(b []byte) uint16 { 63 _ = b[1] // bounds check hint to compiler; see golang.org/issue/14808 64 return uint16(b[1]) | uint16(b[0])<<8 65} 66 67func (binaryBigEndian) PutUint16(b []byte, v uint16) { 68 _ = b[1] // early bounds check to guarantee safety of writes below 69 b[0] = byte(v >> 8) 70 b[1] = byte(v) 71} 72 73func (binaryBigEndian) Uint32(b []byte) uint32 { 74 _ = b[3] // bounds check hint to compiler; see golang.org/issue/14808 75 return uint32(b[3]) | uint32(b[2])<<8 | uint32(b[1])<<16 | uint32(b[0])<<24 76} 77 78func (binaryBigEndian) PutUint32(b []byte, v uint32) { 79 _ = b[3] // early bounds check to guarantee safety of writes below 80 b[0] = byte(v >> 24) 81 b[1] = byte(v >> 16) 82 b[2] = byte(v >> 8) 83 b[3] = byte(v) 84} 85 86func (binaryBigEndian) Uint64(b []byte) uint64 { 87 _ = b[7] // bounds check hint to compiler; see golang.org/issue/14808 88 return uint64(b[7]) | uint64(b[6])<<8 | uint64(b[5])<<16 | uint64(b[4])<<24 | 89 uint64(b[3])<<32 | uint64(b[2])<<40 | uint64(b[1])<<48 | uint64(b[0])<<56 90} 91