1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
// Copyright © 2021 siddharth <s@ricketyspace.net>
// SPDX-License-Identifier: ISC
package lib
// Returns true if byte `b` is in `bs`
func ByteInBytes(b byte, bs []byte) bool {
for _, bi := range bs {
if b == bi {
return true
}
}
return false
}
// Returns bytes that are common in the given array of array of bytes
// `bbytes`.
func BytesInCommon(bbytes [][]byte) []byte {
var common []byte
switch l := len(bbytes); {
case l == 1:
common = make([]byte, len(bbytes[0]))
copy(common, bbytes[0])
case l > 1:
common = make([]byte, 0)
commonRest := BytesInCommon(bbytes[1:])
for _, b := range bbytes[0] {
if ByteInBytes(b, commonRest) {
common = append(common, b)
}
}
}
return common
}
func ByteIsUpper(b byte) bool {
if 'A' <= b && b <= 'Z' {
return true
}
return false
}
func BytesEqual(a, b []byte) bool {
return BlocksEqual(a, b)
}
func BytesToUint32s(bs []byte) []uint32 {
u32s := make([]uint32, 0)
ui := uint32(0) // 32-bit word.
ab := uint(32) // Available bits in ui.
for _, b := range bs {
if ab == 0 {
// ui full; add to u32s and reset ui.
u32s = append(u32s, ui)
ui = uint32(0)
ab = 32
}
// Stuff byte into ui.
ui = ui | uint32(b)<<(ab-8)
ab = ab - 8
}
if ui > 0 {
u32s = append(u32s, ui)
}
return u32s
}
func BytesToUint32sLittleEndian(bs []byte) []uint32 {
u32s := make([]uint32, 0)
ui := uint32(0) // 32-bit word.
ab := uint(0) // Occupied bits in ui
for _, b := range bs {
if ab == 32 {
// ui full; add to u32s and reset ui.
u32s = append(u32s, ui)
ui = uint32(0)
ab = 0
}
// Stuff byte into ui.
ui = ui | uint32(b)<<ab
ab = ab + 8
}
if ui > 0 {
u32s = append(u32s, ui)
}
return u32s
}
|
