/
uint256.go
88 lines (67 loc) · 1.51 KB
/
uint256.go
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
package common
import (
"bytes"
"encoding/binary"
"fmt"
"io"
)
const UINT256SIZE = 32
type Uint256 [UINT256SIZE]uint8
var EmptyUint256 Uint256
var MaxUint256 = Uint256{
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
}
func (u *Uint256) CompareTo(o Uint256) int {
x := u.ToArray()
y := o.ToArray()
for i := 0; i < len(x); i++ {
if x[i] > y[i] {
return 1
}
if x[i] < y[i] {
return -1
}
}
return 0
}
func (u *Uint256) ToArray() []byte {
return u[:]
}
func (u *Uint256) Serialize(w io.Writer) (int, error) {
b_buf := bytes.NewBuffer([]byte{})
binary.Write(b_buf, binary.LittleEndian, u)
len, err := w.Write(b_buf.Bytes())
if err != nil {
return 0, err
}
return len, nil
}
func (u *Uint256) Deserialize(r io.Reader) error {
p := make([]byte, UINT256SIZE)
n, err := r.Read(p)
if n <= 0 || err != nil {
return err
}
b_buf := bytes.NewBuffer(p)
binary.Read(b_buf, binary.LittleEndian, u)
return nil
}
func (u *Uint256) ToString() string {
return string(u.ToArray())
}
func (u *Uint256) ToHexString() string {
return fmt.Sprintf("%x", u.ToArray())
}
func Uint256ParseFromBytes(f []byte) (hash Uint256, err error) {
copy(hash[:], f)
if len(f) != UINT256SIZE {
err = fmt.Errorf("uint256 bytes wrong size %d, expecting %d", len(f), UINT256SIZE)
}
return hash, err
}
func U256Equal(a, b Uint256) bool {
return bytes.Equal(a[:], b[:])
}