You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
87 lines
1.9 KiB
87 lines
1.9 KiB
package bytes
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/hex"
|
|
"encoding/json"
|
|
"fmt"
|
|
"strings"
|
|
)
|
|
|
|
// HexBytes enables HEX-encoding for json/encoding.
|
|
type HexBytes []byte
|
|
|
|
var (
|
|
_ json.Marshaler = HexBytes{}
|
|
_ json.Unmarshaler = &HexBytes{}
|
|
)
|
|
|
|
// Marshal needed for protobuf compatibility
|
|
func (bz HexBytes) Marshal() ([]byte, error) {
|
|
return bz, nil
|
|
}
|
|
|
|
// Unmarshal needed for protobuf compatibility
|
|
func (bz *HexBytes) Unmarshal(data []byte) error {
|
|
*bz = data
|
|
return nil
|
|
}
|
|
|
|
// MarshalJSON implements the json.Marshaler interface. The encoding is a JSON
|
|
// quoted string of hexadecimal digits.
|
|
func (bz HexBytes) MarshalJSON() ([]byte, error) {
|
|
size := hex.EncodedLen(len(bz)) + 2 // +2 for quotation marks
|
|
buf := make([]byte, size)
|
|
hex.Encode(buf[1:], []byte(bz))
|
|
buf[0] = '"'
|
|
buf[size-1] = '"'
|
|
|
|
// Ensure letter digits are capitalized.
|
|
for i := 1; i < size-1; i++ {
|
|
if buf[i] >= 'a' && buf[i] <= 'f' {
|
|
buf[i] = 'A' + (buf[i] - 'a')
|
|
}
|
|
}
|
|
return buf, nil
|
|
}
|
|
|
|
// UnmarshalJSON implements the json.Umarshaler interface.
|
|
func (bz *HexBytes) UnmarshalJSON(data []byte) error {
|
|
if bytes.Equal(data, []byte("null")) {
|
|
return nil
|
|
}
|
|
|
|
if len(data) < 2 || data[0] != '"' || data[len(data)-1] != '"' {
|
|
return fmt.Errorf("invalid hex string: %s", data)
|
|
}
|
|
|
|
bz2, err := hex.DecodeString(string(data[1 : len(data)-1]))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
*bz = bz2
|
|
|
|
return nil
|
|
}
|
|
|
|
// Bytes fulfills various interfaces in light-client, etc...
|
|
func (bz HexBytes) Bytes() []byte {
|
|
return bz
|
|
}
|
|
|
|
func (bz HexBytes) String() string {
|
|
return strings.ToUpper(hex.EncodeToString(bz))
|
|
}
|
|
|
|
// Format writes either address of 0th element in a slice in base 16 notation,
|
|
// with leading 0x (%p), or casts HexBytes to bytes and writes as hexadecimal
|
|
// string to s.
|
|
func (bz HexBytes) Format(s fmt.State, verb rune) {
|
|
switch verb {
|
|
case 'p':
|
|
s.Write([]byte(fmt.Sprintf("%p", bz)))
|
|
default:
|
|
s.Write([]byte(fmt.Sprintf("%X", []byte(bz))))
|
|
}
|
|
}
|