mirror of
https://github.com/nspcc-dev/neo-go.git
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133 lines
3.2 KiB
Go
133 lines
3.2 KiB
Go
package util
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import (
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"encoding/hex"
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"encoding/json"
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"fmt"
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"strings"
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)
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// Uint160Size is the size of Uint160 in bytes.
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const Uint160Size = 20
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// Uint160 is a 20 byte long unsigned integer.
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type Uint160 [Uint160Size]uint8
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// Uint160DecodeStringBE attempts to decode the given string into an Uint160.
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func Uint160DecodeStringBE(s string) (Uint160, error) {
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var u Uint160
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if len(s) != Uint160Size*2 {
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return u, fmt.Errorf("expected string size of %d got %d", Uint160Size*2, len(s))
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}
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b, err := hex.DecodeString(s)
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if err != nil {
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return u, err
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}
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return Uint160DecodeBytesBE(b)
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}
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// Uint160DecodeStringLE attempts to decode the given string
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// in little-endian hex encoding into an Uint160.
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func Uint160DecodeStringLE(s string) (Uint160, error) {
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var u Uint160
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if len(s) != Uint160Size*2 {
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return u, fmt.Errorf("expected string size of %d got %d", Uint160Size*2, len(s))
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}
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b, err := hex.DecodeString(s)
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if err != nil {
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return u, err
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}
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return Uint160DecodeBytesLE(b)
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}
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// Uint160DecodeBytesBE attempts to decode the given bytes into an Uint160.
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func Uint160DecodeBytesBE(b []byte) (u Uint160, err error) {
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if len(b) != Uint160Size {
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return u, fmt.Errorf("expected byte size of %d got %d", Uint160Size, len(b))
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}
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copy(u[:], b)
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return
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}
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// Uint160DecodeBytesLE attempts to decode the given bytes in little-endian
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// into an Uint160.
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func Uint160DecodeBytesLE(b []byte) (u Uint160, err error) {
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if len(b) != Uint160Size {
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return u, fmt.Errorf("expected byte size of %d got %d", Uint160Size, len(b))
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}
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for i := range b {
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u[Uint160Size-i-1] = b[i]
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}
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return
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}
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// BytesBE returns a big-endian byte representation of u.
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func (u Uint160) BytesBE() []byte {
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return u[:]
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}
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// BytesLE returns a little-endian byte representation of u.
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func (u Uint160) BytesLE() []byte {
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return ArrayReverse(u.BytesBE())
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}
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// String implements the stringer interface.
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func (u Uint160) String() string {
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return u.StringBE()
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}
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// StringBE returns string representations of u with big-endian byte order.
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func (u Uint160) StringBE() string {
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return hex.EncodeToString(u.BytesBE())
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}
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// StringLE returns string representations of u with little-endian byte order.
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func (u Uint160) StringLE() string {
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return hex.EncodeToString(u.BytesLE())
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}
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// Reverse returns reversed representation of u.
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func (u Uint160) Reverse() (r Uint160) {
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for i := 0; i < Uint160Size; i++ {
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r[i] = u[Uint160Size-i-1]
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}
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return
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}
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// Equals returns true if both Uint256 values are the same.
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func (u Uint160) Equals(other Uint160) bool {
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return u == other
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}
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// Less returns true if this value is less than given Uint160 value. It's
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// primarily intended to be used for sorting purposes.
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func (u Uint160) Less(other Uint160) bool {
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for k := range u {
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if u[k] == other[k] {
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continue
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}
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return u[k] < other[k]
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}
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return false
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}
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// UnmarshalJSON implements the json unmarshaller interface.
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func (u *Uint160) UnmarshalJSON(data []byte) (err error) {
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var js string
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if err = json.Unmarshal(data, &js); err != nil {
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return err
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}
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js = strings.TrimPrefix(js, "0x")
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*u, err = Uint160DecodeStringLE(js)
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return err
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}
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// MarshalJSON implements the json marshaller interface.
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func (u Uint160) MarshalJSON() ([]byte, error) {
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return []byte(`"0x` + u.StringLE() + `"`), nil
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}
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