erigon-pulse/erigon-lib/common/hexutility/bytes.go
battlmonstr 231e468e19 Add 'erigon-lib/' from commit '93d9c9d9fe4bd8a49f7a98a6bce0f0da7094c7d3'
git-subtree-dir: erigon-lib
git-subtree-mainline: 3c8cbda809
git-subtree-split: 93d9c9d9fe
2023-09-20 14:50:25 +02:00

67 lines
1.7 KiB
Go

/*
Copyright 2023 The Erigon contributors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package hexutility
import (
"encoding/hex"
"encoding/json"
"reflect"
)
var bytesT = reflect.TypeOf(Bytes(nil))
// Bytes marshals/unmarshals as a JSON string with 0x prefix.
// The empty slice marshals as "0x".
type Bytes []byte
const hexPrefix = `0x`
// MarshalText implements encoding.TextMarshaler
func (b Bytes) MarshalText() ([]byte, error) {
result := make([]byte, len(b)*2+2)
copy(result, hexPrefix)
hex.Encode(result[2:], b)
return result, nil
}
// UnmarshalJSON implements json.Unmarshaler.
func (b *Bytes) UnmarshalJSON(input []byte) error {
if !isString(input) {
return &json.UnmarshalTypeError{Value: "non-string", Type: bytesT}
}
return wrapTypeError(b.UnmarshalText(input[1:len(input)-1]), bytesT)
}
// UnmarshalText implements encoding.TextUnmarshaler.
func (b *Bytes) UnmarshalText(input []byte) error {
raw, err := checkText(input, true)
if err != nil {
return err
}
dec := make([]byte, len(raw)/2)
_, err = hex.Decode(dec, raw)
if err == nil {
*b = dec
}
return err
}
// String returns the hex encoding of b.
func (b Bytes) String() string {
return Encode(b)
}