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80 lines
1.7 KiB
80 lines
1.7 KiB
package bytes
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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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)
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// HexBytes enables HEX-encoding for json/encoding.
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type HexBytes []byte
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var (
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_ json.Marshaler = HexBytes{}
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_ json.Unmarshaler = &HexBytes{}
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)
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// Marshal needed for protobuf compatibility
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func (bz HexBytes) Marshal() ([]byte, error) {
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return bz, nil
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}
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// Unmarshal needed for protobuf compatibility
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func (bz *HexBytes) Unmarshal(data []byte) error {
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*bz = data
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return nil
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}
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// MarshalJSON implements the json.Marshaler interface. The hex bytes is a
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// quoted hexadecimal encoded string.
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func (bz HexBytes) MarshalJSON() ([]byte, error) {
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s := strings.ToUpper(hex.EncodeToString(bz))
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jbz := make([]byte, len(s)+2)
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jbz[0] = '"'
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copy(jbz[1:], s)
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jbz[len(jbz)-1] = '"'
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return jbz, nil
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}
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// UnmarshalJSON implements the json.Umarshaler interface.
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func (bz *HexBytes) UnmarshalJSON(data []byte) error {
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if bytes.Equal(data, []byte("null")) {
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return nil
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}
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if len(data) < 2 || data[0] != '"' || data[len(data)-1] != '"' {
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return fmt.Errorf("invalid hex string: %s", data)
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}
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bz2, err := hex.DecodeString(string(data[1 : len(data)-1]))
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if err != nil {
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return err
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}
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*bz = bz2
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return nil
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}
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// Bytes fulfils various interfaces in light-client, etc...
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func (bz HexBytes) Bytes() []byte {
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return bz
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}
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func (bz HexBytes) String() string {
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return strings.ToUpper(hex.EncodeToString(bz))
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}
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// Format writes either address of 0th element in a slice in base 16 notation,
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// with leading 0x (%p), or casts HexBytes to bytes and writes as hexadecimal
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// string to s.
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func (bz HexBytes) Format(s fmt.State, verb rune) {
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switch verb {
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case 'p':
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s.Write([]byte(fmt.Sprintf("%p", bz)))
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default:
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s.Write([]byte(fmt.Sprintf("%X", []byte(bz))))
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}
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}
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