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//go:build darwin || dragonfly || freebsd || netbsd || openbsd
6// +build darwin dragonfly freebsd netbsd openbsd
7
8package route
9
10// This file contains duplicates of encoding/binary package.
11//
12// This package is supposed to be used by the net package of standard
13// library. Therefore the package set used in the package must be the
14// same as net package.
15
16var (
17	littleEndian binaryLittleEndian
18	bigEndian    binaryBigEndian
19)
20
21type binaryByteOrder interface {
22	Uint16([]byte) uint16
23	Uint32([]byte) uint32
24	PutUint16([]byte, uint16)
25	PutUint32([]byte, uint32)
26	Uint64([]byte) uint64
27}
28
29type binaryLittleEndian struct{}
30
31func (binaryLittleEndian) Uint16(b []byte) uint16 {
32	_ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
33	return uint16(b[0]) | uint16(b[1])<<8
34}
35
36func (binaryLittleEndian) PutUint16(b []byte, v uint16) {
37	_ = b[1] // early bounds check to guarantee safety of writes below
38	b[0] = byte(v)
39	b[1] = byte(v >> 8)
40}
41
42func (binaryLittleEndian) Uint32(b []byte) uint32 {
43	_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
44	return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
45}
46
47func (binaryLittleEndian) PutUint32(b []byte, v uint32) {
48	_ = b[3] // early bounds check to guarantee safety of writes below
49	b[0] = byte(v)
50	b[1] = byte(v >> 8)
51	b[2] = byte(v >> 16)
52	b[3] = byte(v >> 24)
53}
54
55func (binaryLittleEndian) Uint64(b []byte) uint64 {
56	_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
57	return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 |
58		uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
59}
60
61type binaryBigEndian struct{}
62
63func (binaryBigEndian) Uint16(b []byte) uint16 {
64	_ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
65	return uint16(b[1]) | uint16(b[0])<<8
66}
67
68func (binaryBigEndian) PutUint16(b []byte, v uint16) {
69	_ = b[1] // early bounds check to guarantee safety of writes below
70	b[0] = byte(v >> 8)
71	b[1] = byte(v)
72}
73
74func (binaryBigEndian) Uint32(b []byte) uint32 {
75	_ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
76	return uint32(b[3]) | uint32(b[2])<<8 | uint32(b[1])<<16 | uint32(b[0])<<24
77}
78
79func (binaryBigEndian) PutUint32(b []byte, v uint32) {
80	_ = b[3] // early bounds check to guarantee safety of writes below
81	b[0] = byte(v >> 24)
82	b[1] = byte(v >> 16)
83	b[2] = byte(v >> 8)
84	b[3] = byte(v)
85}
86
87func (binaryBigEndian) Uint64(b []byte) uint64 {
88	_ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
89	return uint64(b[7]) | uint64(b[6])<<8 | uint64(b[5])<<16 | uint64(b[4])<<24 |
90		uint64(b[3])<<32 | uint64(b[2])<<40 | uint64(b[1])<<48 | uint64(b[0])<<56
91}
92