forked from TrueCloudLab/neoneo-go
79 lines
1.9 KiB
Go
79 lines
1.9 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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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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// Uint256DecodeString attempts to decode the given string into an Uint256.
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func Uint256DecodeString(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 Uint256DecodeBytes(b)
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}
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// Uint256DecodeBytes attempts to decode the given string into an Uint256.
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func Uint256DecodeBytes(b []byte) (u Uint256, err error) {
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b = ArrayReverse(b)
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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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for i := 0; i < uint256Size; i++ {
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u[i] = b[i]
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}
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return u, nil
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}
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// Bytes returns a byte slice representation of u.
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func (u Uint256) Bytes() []byte {
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b := make([]byte, uint256Size)
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for i := 0; i < uint256Size; i++ {
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b[i] = byte(u[i])
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}
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return b
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}
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// BytesReverse return a reversed byte representation of u.
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func (u Uint256) BytesReverse() []byte {
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return ArrayReverse(u.Bytes())
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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.String() == other.String()
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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 hex.EncodeToString(ArrayReverse(u.Bytes()))
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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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if strings.HasPrefix(js, "0x") {
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js = js[2:]
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}
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*u, err = Uint256DecodeString(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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return json.Marshal(fmt.Sprintf("0x%s", u.String()))
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}
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