/
bytes.go
87 lines (72 loc) · 1.9 KB
/
bytes.go
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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))))
}
}