forked from TrueCloudLab/neoneo-go
99 lines
2.7 KiB
Go
99 lines
2.7 KiB
Go
package util
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/hex"
|
|
"encoding/json"
|
|
"fmt"
|
|
"strings"
|
|
)
|
|
|
|
const uint256Size = 32
|
|
|
|
// Uint256 is a 32 byte long unsigned integer.
|
|
type Uint256 [uint256Size]uint8
|
|
|
|
// Uint256DecodeReverseString attempts to decode the given string (in LE representation) into an Uint256.
|
|
func Uint256DecodeReverseString(s string) (u Uint256, err error) {
|
|
if len(s) != uint256Size*2 {
|
|
return u, fmt.Errorf("expected string size of %d got %d", uint256Size*2, len(s))
|
|
}
|
|
b, err := hex.DecodeString(s)
|
|
if err != nil {
|
|
return u, err
|
|
}
|
|
return Uint256DecodeReverseBytes(b)
|
|
}
|
|
|
|
// Uint256DecodeBytes attempts to decode the given string (in BE representation) into an Uint256.
|
|
func Uint256DecodeBytes(b []byte) (u Uint256, err error) {
|
|
if len(b) != uint256Size {
|
|
return u, fmt.Errorf("expected []byte of size %d got %d", uint256Size, len(b))
|
|
}
|
|
copy(u[:], b)
|
|
return u, nil
|
|
}
|
|
|
|
// Uint256DecodeReverseBytes attempts to decode the given string (in LE representation) into an Uint256.
|
|
func Uint256DecodeReverseBytes(b []byte) (u Uint256, err error) {
|
|
b = ArrayReverse(b)
|
|
return Uint256DecodeBytes(b)
|
|
}
|
|
|
|
// Bytes returns a byte slice representation of u.
|
|
func (u Uint256) Bytes() []byte {
|
|
return u[:]
|
|
}
|
|
|
|
// Reverse reverses the Uint256 object
|
|
func (u Uint256) Reverse() Uint256 {
|
|
res, _ := Uint256DecodeReverseBytes(u.Bytes())
|
|
return res
|
|
}
|
|
|
|
// BytesReverse return a reversed byte representation of u.
|
|
func (u Uint256) BytesReverse() []byte {
|
|
return ArrayReverse(u.Bytes())
|
|
}
|
|
|
|
// Equals returns true if both Uint256 values are the same.
|
|
func (u Uint256) Equals(other Uint256) bool {
|
|
return u == other
|
|
}
|
|
|
|
// String implements the stringer interface.
|
|
func (u Uint256) String() string {
|
|
return hex.EncodeToString(u.Bytes())
|
|
}
|
|
|
|
// ReverseString produces string representation of Uint256 with LE byte order.
|
|
func (u Uint256) ReverseString() string {
|
|
return hex.EncodeToString(u.BytesReverse())
|
|
}
|
|
|
|
// UnmarshalJSON implements the json unmarshaller interface.
|
|
func (u *Uint256) UnmarshalJSON(data []byte) (err error) {
|
|
var js string
|
|
if err = json.Unmarshal(data, &js); err != nil {
|
|
return err
|
|
}
|
|
js = strings.TrimPrefix(js, "0x")
|
|
*u, err = Uint256DecodeReverseString(js)
|
|
return err
|
|
}
|
|
|
|
// Size returns the lenght of the bytes representation of Uint256
|
|
func (u Uint256) Size() int {
|
|
return uint256Size
|
|
}
|
|
|
|
// MarshalJSON implements the json marshaller interface.
|
|
func (u Uint256) MarshalJSON() ([]byte, error) {
|
|
return []byte(`"0x` + u.ReverseString() + `"`), nil
|
|
}
|
|
|
|
// CompareTo compares two Uint256 with each other. Possible output: 1, -1, 0
|
|
// 1 implies u > other.
|
|
// -1 implies u < other.
|
|
// 0 implies u = other.
|
|
func (u Uint256) CompareTo(other Uint256) int { return bytes.Compare(u[:], other[:]) }
|