neo-go/pkg/util/uint160.go
Evgeniy Kulikov f000b76879 [FIX] Formatting and code-style (#118)
* [FIX] Formatting and code-style

- gofmt
- import resort
- prealloc slices
- simplify code

* fix vet
2019-01-25 12:20:35 +01:00

87 lines
2 KiB
Go

package util
import (
"crypto/sha256"
"encoding/hex"
"encoding/json"
"fmt"
"strings"
"golang.org/x/crypto/ripemd160"
)
const uint160Size = 20
// Uint160 is a 20 byte long unsigned integer.
type Uint160 [uint160Size]uint8
// Uint160DecodeString attempts to decode the given string into an Uint160.
func Uint160DecodeString(s string) (Uint160, error) {
var u Uint160
if len(s) != uint160Size*2 {
return u, fmt.Errorf("expected string size of %d got %d", uint160Size*2, len(s))
}
b, err := hex.DecodeString(s)
if err != nil {
return u, err
}
return Uint160DecodeBytes(b)
}
// Uint160DecodeBytes attempts to decode the given bytes into an Uint160.
func Uint160DecodeBytes(b []byte) (u Uint160, err error) {
if len(b) != uint160Size {
return u, fmt.Errorf("expected byte size of %d got %d", uint160Size, len(b))
}
copy(u[:], b)
return
}
// Uint160FromScript returns a Uint160 type from a raw script.
func Uint160FromScript(script []byte) (u Uint160, err error) {
sha := sha256.New()
sha.Write(script)
b := sha.Sum(nil)
ripemd := ripemd160.New()
ripemd.Write(b)
b = ripemd.Sum(nil)
return Uint160DecodeBytes(b)
}
// Bytes returns the byte slice representation of u.
func (u Uint160) Bytes() []byte {
return u[:]
}
// BytesReverse return a reversed byte representation of u.
func (u Uint160) BytesReverse() []byte {
return ArrayReverse(u.Bytes())
}
// String implements the stringer interface.
func (u Uint160) String() string {
return hex.EncodeToString(u.Bytes())
}
// Equals returns true if both Uint256 values are the same.
func (u Uint160) Equals(other Uint160) bool {
return u == other
}
// UnmarshalJSON implements the json unmarshaller interface.
func (u *Uint160) UnmarshalJSON(data []byte) (err error) {
var js string
if err = json.Unmarshal(data, &js); err != nil {
return err
}
if strings.HasPrefix(js, "0x") {
js = js[2:]
}
*u, err = Uint160DecodeString(js)
return err
}
// MarshalJSON implements the json marshaller interface.
func (u Uint160) MarshalJSON() ([]byte, error) {
return []byte(`"0x` + u.String() + `"`), nil
}