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 7 package 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 a package set used in the package must be the 13 // same as net package. 14 15 var ( 16 littleEndian binaryLittleEndian 17 bigEndian binaryBigEndian 18 ) 19 20 type binaryByteOrder interface { 21 Uint16([]byte) uint16 22 Uint32([]byte) uint32 23 PutUint16([]byte, uint16) 24 PutUint32([]byte, uint32) 25 Uint64([]byte) uint64 26 } 27 28 type binaryLittleEndian struct{} 29 30 func (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 35 func (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 41 func (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 46 func (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 54 func (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 60 type binaryBigEndian struct{} 61 62 func (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 67 func (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 73 func (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 78 func (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 86 func (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
