forked from elastos/Elastos.ELA
/
uint168.go
131 lines (103 loc) · 2.42 KB
/
uint168.go
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package common
import (
"bytes"
"crypto/sha256"
"encoding/binary"
"errors"
"io"
"math/big"
"github.com/itchyny/base58-go"
)
//This is a magical change of Uint168, with length from 20 to 21.
//In fact, It is UINT168 now.
const UINT168SIZE = 21
type Uint168 [UINT168SIZE]uint8
func (u *Uint168) CompareTo(o Uint168) int {
x := u.ToArray()
y := o.ToArray()
for i := len(x) - 1; i >= 0; i-- {
if x[i] > y[i] {
return 1
}
if x[i] < y[i] {
return -1
}
}
return 0
}
func (u *Uint168) ToArray() []byte {
var x = make([]byte, UINT168SIZE)
for i := 0; i < UINT168SIZE; i++ {
x[i] = byte(u[i])
}
return x
}
func (u *Uint168) ToArrayReverse() []byte {
var x = make([]byte, UINT168SIZE)
for i, j := 0, UINT168SIZE-1; i < j; i, j = i+1, j-1 {
x[i], x[j] = byte(u[j]), byte(u[i])
}
return x
}
func (u *Uint168) 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 (f *Uint168) Deserialize(r io.Reader) error {
p := make([]byte, UINT168SIZE)
n, err := r.Read(p)
if n <= 0 || err != nil {
return err
}
b_buf := bytes.NewBuffer(p)
binary.Read(b_buf, binary.LittleEndian, f)
return nil
}
func (f *Uint168) ToAddress() (string, error) {
data := f.ToArray()
temp := sha256.Sum256(data)
temps := sha256.Sum256(temp[:])
data = append(data, temps[0:4]...)
bi := new(big.Int).SetBytes(data).String()
encoding := base58.BitcoinEncoding
encoded, err := encoding.Encode([]byte(bi))
if err != nil {
return "", err
}
return string(encoded), nil
}
func Uint168FromBytes(f []byte) (Uint168, error) {
if len(f) != UINT168SIZE {
return Uint168{}, errors.New("[Common]: Uint168ParseFromBytes err, len != 21")
}
var hash [UINT168SIZE]uint8
for i := 0; i < UINT168SIZE; i++ {
hash[i] = f[i]
}
return Uint168(hash), nil
}
func Uint68FromAddress(address string) (Uint168, error) {
encoding := base58.BitcoinEncoding
decoded, err := encoding.Decode([]byte(address))
if err != nil {
return Uint168{}, err
}
x, _ := new(big.Int).SetString(string(decoded), 10)
ph, err := Uint168FromBytes(x.Bytes()[0:21])
if err != nil {
return Uint168{}, err
}
addr, err := ph.ToAddress()
if err != nil {
return Uint168{}, err
}
if addr != address {
return Uint168{}, errors.New("[AddressToProgramHash]: decode address verify failed.")
}
return ph, nil
}