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// Copyright (c) 2020 Cisco and/or its affiliates.
//
// 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 codec
import (
"bytes"
"reflect"
"github.com/lunixbochs/struc"
"git.fd.io/govpp.git/api"
)
// Marshaler is the interface implemented by the binary API messages that can
// marshal itself into binary form for the wire.
type Marshaler interface {
Size() int
Marshal([]byte) ([]byte, error)
}
// Unmarshaler is the interface implemented by the binary API messages that can
// unmarshal a binary representation of itself from the wire.
type Unmarshaler interface {
Unmarshal([]byte) error
}
type Wrapper struct {
api.Message
}
func (w Wrapper) Size() int {
if size, err := struc.Sizeof(w.Message); err != nil {
return 0
} else {
return size
}
}
func (w Wrapper) Marshal(b []byte) ([]byte, error) {
buf := new(bytes.Buffer)
if reflect.TypeOf(w.Message).Elem().NumField() > 0 {
if err := struc.Pack(buf, w.Message); err != nil {
return nil, err
}
}
if b != nil {
copy(b, buf.Bytes())
}
return buf.Bytes(), nil
}
func (w Wrapper) Unmarshal(data []byte) error {
buf := bytes.NewReader(data)
if err := struc.Unpack(buf, w.Message); err != nil {
return err
}
return nil
}
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