mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-11-22 09:29:38 +00:00
134 lines
3.5 KiB
Go
134 lines
3.5 KiB
Go
package util
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/hex"
|
|
"encoding/json"
|
|
"fmt"
|
|
"strings"
|
|
|
|
"github.com/nspcc-dev/neo-go/pkg/io"
|
|
"github.com/nspcc-dev/neo-go/pkg/util/slice"
|
|
)
|
|
|
|
// Uint256Size is the size of Uint256 in bytes.
|
|
const Uint256Size = 32
|
|
|
|
// Uint256 is a 32 byte long unsigned integer.
|
|
type Uint256 [Uint256Size]uint8
|
|
|
|
// Uint256DecodeStringLE attempts to decode the given string (in LE representation) into a Uint256.
|
|
func Uint256DecodeStringLE(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
|
|
}
|
|
slice.Reverse(b)
|
|
return Uint256DecodeBytesBE(b)
|
|
}
|
|
|
|
// Uint256DecodeStringBE attempts to decode the given string (in BE representation)
|
|
// into a Uint256.
|
|
func Uint256DecodeStringBE(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 Uint256DecodeBytesBE(b)
|
|
}
|
|
|
|
// Uint256DecodeBytesBE attempts to decode the given string (in BE representation) into a Uint256.
|
|
func Uint256DecodeBytesBE(b []byte) (u Uint256, err error) {
|
|
if len(b) != Uint256Size {
|
|
return u, fmt.Errorf("expected []byte of size %d got %d", Uint256Size, len(b))
|
|
}
|
|
return Uint256(b), nil
|
|
}
|
|
|
|
// Uint256DecodeBytesLE attempts to decode the given string (in LE representation) into a Uint256.
|
|
func Uint256DecodeBytesLE(b []byte) (u Uint256, err error) {
|
|
b = slice.CopyReverse(b)
|
|
return Uint256DecodeBytesBE(b)
|
|
}
|
|
|
|
// BytesBE returns a byte slice representation of u.
|
|
func (u Uint256) BytesBE() []byte {
|
|
return u[:]
|
|
}
|
|
|
|
// Reverse reverses the Uint256 object.
|
|
func (u Uint256) Reverse() Uint256 {
|
|
res, _ := Uint256DecodeBytesLE(u.BytesBE())
|
|
return res
|
|
}
|
|
|
|
// BytesLE return a little-endian byte representation of u.
|
|
func (u Uint256) BytesLE() []byte {
|
|
return slice.CopyReverse(u.BytesBE())
|
|
}
|
|
|
|
// 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 u.StringBE()
|
|
}
|
|
|
|
// StringBE produces string representation of Uint256 with BE byte order.
|
|
func (u Uint256) StringBE() string {
|
|
return hex.EncodeToString(u.BytesBE())
|
|
}
|
|
|
|
// StringLE produces string representation of Uint256 with LE byte order.
|
|
func (u Uint256) StringLE() string {
|
|
return hex.EncodeToString(u.BytesLE())
|
|
}
|
|
|
|
// 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 = Uint256DecodeStringLE(js)
|
|
return err
|
|
}
|
|
|
|
// MarshalJSON implements the json marshaller interface.
|
|
func (u Uint256) MarshalJSON() ([]byte, error) {
|
|
r := make([]byte, 3+Uint256Size*2+1)
|
|
copy(r, `"0x`)
|
|
r[len(r)-1] = '"'
|
|
slice.Reverse(u[:]) // u is a copy, so we can mangle it in any way.
|
|
hex.Encode(r[3:], u[:])
|
|
return r, 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[:]) }
|
|
|
|
// EncodeBinary implements the io.Serializable interface.
|
|
func (u *Uint256) EncodeBinary(w *io.BinWriter) {
|
|
w.WriteBytes(u[:])
|
|
}
|
|
|
|
// DecodeBinary implements the io.Serializable interface.
|
|
func (u *Uint256) DecodeBinary(r *io.BinReader) {
|
|
r.ReadBytes(u[:])
|
|
}
|