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134 lines
3.5 KiB
Go
134 lines
3.5 KiB
Go
package util
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import (
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"bytes"
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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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"github.com/nspcc-dev/neo-go/pkg/io"
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"github.com/nspcc-dev/neo-go/pkg/util/slice"
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)
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// Uint256Size is the size of Uint256 in bytes.
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const Uint256Size = 32
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// Uint256 is a 32 byte long unsigned integer.
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type Uint256 [Uint256Size]uint8
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// Uint256DecodeStringLE attempts to decode the given string (in LE representation) into a Uint256.
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func Uint256DecodeStringLE(s string) (u Uint256, err error) {
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if len(s) != Uint256Size*2 {
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return u, fmt.Errorf("expected string size of %d got %d", Uint256Size*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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slice.Reverse(b)
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return Uint256DecodeBytesBE(b)
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}
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// Uint256DecodeStringBE attempts to decode the given string (in BE representation)
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// into a Uint256.
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func Uint256DecodeStringBE(s string) (u Uint256, err error) {
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if len(s) != Uint256Size*2 {
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return u, fmt.Errorf("expected string size of %d got %d", Uint256Size*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 Uint256DecodeBytesBE(b)
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}
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// Uint256DecodeBytesBE attempts to decode the given string (in BE representation) into a Uint256.
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func Uint256DecodeBytesBE(b []byte) (u Uint256, err error) {
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if len(b) != Uint256Size {
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return u, fmt.Errorf("expected []byte of size %d got %d", Uint256Size, len(b))
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}
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return Uint256(b), nil
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}
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// Uint256DecodeBytesLE attempts to decode the given string (in LE representation) into a Uint256.
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func Uint256DecodeBytesLE(b []byte) (u Uint256, err error) {
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b = slice.CopyReverse(b)
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return Uint256DecodeBytesBE(b)
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}
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// BytesBE returns a byte slice representation of u.
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func (u Uint256) BytesBE() []byte {
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return u[:]
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}
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// Reverse reverses the Uint256 object.
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func (u Uint256) Reverse() Uint256 {
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res, _ := Uint256DecodeBytesLE(u.BytesBE())
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return res
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}
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// BytesLE return a little-endian byte representation of u.
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func (u Uint256) BytesLE() []byte {
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return slice.CopyReverse(u.BytesBE())
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}
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// Equals returns true if both Uint256 values are the same.
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func (u Uint256) Equals(other Uint256) bool {
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return u == other
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}
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// String implements the stringer interface.
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func (u Uint256) String() string {
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return u.StringBE()
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}
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// StringBE produces string representation of Uint256 with BE byte order.
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func (u Uint256) StringBE() string {
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return hex.EncodeToString(u.BytesBE())
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}
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// StringLE produces string representation of Uint256 with LE byte order.
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func (u Uint256) StringLE() string {
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return hex.EncodeToString(u.BytesLE())
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}
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// UnmarshalJSON implements the json unmarshaller interface.
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func (u *Uint256) 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 = Uint256DecodeStringLE(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 Uint256) MarshalJSON() ([]byte, error) {
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r := make([]byte, 3+Uint256Size*2+1)
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copy(r, `"0x`)
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r[len(r)-1] = '"'
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slice.Reverse(u[:]) // u is a copy, so we can mangle it in any way.
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hex.Encode(r[3:], u[:])
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return r, nil
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}
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// CompareTo compares two Uint256 with each other. Possible output: 1, -1, 0
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//
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// 1 implies u > other.
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// -1 implies u < other.
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// 0 implies u = other.
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func (u Uint256) CompareTo(other Uint256) int { return bytes.Compare(u[:], other[:]) }
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// EncodeBinary implements the io.Serializable interface.
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func (u *Uint256) EncodeBinary(w *io.BinWriter) {
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w.WriteBytes(u[:])
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}
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// DecodeBinary implements the io.Serializable interface.
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func (u *Uint256) DecodeBinary(r *io.BinReader) {
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r.ReadBytes(u[:])
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}
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