byteorder.mx raw
1 // Copyright 2024 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 // Package byteorder provides functions for decoding and encoding
6 // little and big endian integer types from/to byte slices.
7 package byteorder
8
9 func LEUint16(b []byte) uint16 {
10 _ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
11 return uint16(b[0]) | uint16(b[1])<<8
12 }
13
14 func LEPutUint16(b []byte, v uint16) {
15 _ = b[1] // early bounds check to guarantee safety of writes below
16 b[0] = byte(v)
17 b[1] = byte(v >> 8)
18 }
19
20 func LEAppendUint16(b []byte, v uint16) []byte {
21 return append(b,
22 byte(v),
23 byte(v>>8),
24 )
25 }
26
27 func LEUint32(b []byte) uint32 {
28 _ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
29 return uint32(b[0]) | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
30 }
31
32 func LEPutUint32(b []byte, v uint32) {
33 _ = b[3] // early bounds check to guarantee safety of writes below
34 b[0] = byte(v)
35 b[1] = byte(v >> 8)
36 b[2] = byte(v >> 16)
37 b[3] = byte(v >> 24)
38 }
39
40 func LEAppendUint32(b []byte, v uint32) []byte {
41 return append(b,
42 byte(v),
43 byte(v>>8),
44 byte(v>>16),
45 byte(v>>24),
46 )
47 }
48
49 func LEUint64(b []byte) uint64 {
50 _ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
51 return uint64(b[0]) | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 |
52 uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
53 }
54
55 func LEPutUint64(b []byte, v uint64) {
56 _ = b[7] // early bounds check to guarantee safety of writes below
57 b[0] = byte(v)
58 b[1] = byte(v >> 8)
59 b[2] = byte(v >> 16)
60 b[3] = byte(v >> 24)
61 b[4] = byte(v >> 32)
62 b[5] = byte(v >> 40)
63 b[6] = byte(v >> 48)
64 b[7] = byte(v >> 56)
65 }
66
67 func LEAppendUint64(b []byte, v uint64) []byte {
68 return append(b,
69 byte(v),
70 byte(v>>8),
71 byte(v>>16),
72 byte(v>>24),
73 byte(v>>32),
74 byte(v>>40),
75 byte(v>>48),
76 byte(v>>56),
77 )
78 }
79
80 func BEUint16(b []byte) uint16 {
81 _ = b[1] // bounds check hint to compiler; see golang.org/issue/14808
82 return uint16(b[1]) | uint16(b[0])<<8
83 }
84
85 func BEPutUint16(b []byte, v uint16) {
86 _ = b[1] // early bounds check to guarantee safety of writes below
87 b[0] = byte(v >> 8)
88 b[1] = byte(v)
89 }
90
91 func BEAppendUint16(b []byte, v uint16) []byte {
92 return append(b,
93 byte(v>>8),
94 byte(v),
95 )
96 }
97
98 func BEUint32(b []byte) uint32 {
99 _ = b[3] // bounds check hint to compiler; see golang.org/issue/14808
100 return uint32(b[3]) | uint32(b[2])<<8 | uint32(b[1])<<16 | uint32(b[0])<<24
101 }
102
103 func BEPutUint32(b []byte, v uint32) {
104 _ = b[3] // early bounds check to guarantee safety of writes below
105 b[0] = byte(v >> 24)
106 b[1] = byte(v >> 16)
107 b[2] = byte(v >> 8)
108 b[3] = byte(v)
109 }
110
111 func BEAppendUint32(b []byte, v uint32) []byte {
112 return append(b,
113 byte(v>>24),
114 byte(v>>16),
115 byte(v>>8),
116 byte(v),
117 )
118 }
119
120 func BEUint64(b []byte) uint64 {
121 _ = b[7] // bounds check hint to compiler; see golang.org/issue/14808
122 return uint64(b[7]) | uint64(b[6])<<8 | uint64(b[5])<<16 | uint64(b[4])<<24 |
123 uint64(b[3])<<32 | uint64(b[2])<<40 | uint64(b[1])<<48 | uint64(b[0])<<56
124 }
125
126 func BEPutUint64(b []byte, v uint64) {
127 _ = b[7] // early bounds check to guarantee safety of writes below
128 b[0] = byte(v >> 56)
129 b[1] = byte(v >> 48)
130 b[2] = byte(v >> 40)
131 b[3] = byte(v >> 32)
132 b[4] = byte(v >> 24)
133 b[5] = byte(v >> 16)
134 b[6] = byte(v >> 8)
135 b[7] = byte(v)
136 }
137
138 func BEAppendUint64(b []byte, v uint64) []byte {
139 return append(b,
140 byte(v>>56),
141 byte(v>>48),
142 byte(v>>40),
143 byte(v>>32),
144 byte(v>>24),
145 byte(v>>16),
146 byte(v>>8),
147 byte(v),
148 )
149 }
150