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