frp/models/msg/pack.go

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// Copyright 2016 fatedier, fatedier@gmail.com
//
// 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 msg
import (
"bytes"
"encoding/binary"
"encoding/json"
"fmt"
"reflect"
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"github.com/fatedier/frp/models/errors"
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)
func unpack(typeByte byte, buffer []byte, msgIn Message) (msg Message, err error) {
if msgIn == nil {
t, ok := TypeMap[typeByte]
if !ok {
err = fmt.Errorf("Unsupported message type %b", typeByte)
return
}
msg = reflect.New(t).Interface().(Message)
} else {
msg = msgIn
}
err = json.Unmarshal(buffer, &msg)
return
}
func UnPackInto(buffer []byte, msg Message) (err error) {
_, err = unpack(' ', buffer, msg)
return
}
func UnPack(typeByte byte, buffer []byte) (msg Message, err error) {
return unpack(typeByte, buffer, nil)
}
func Pack(msg Message) ([]byte, error) {
typeByte, ok := TypeStringMap[reflect.TypeOf(msg).Elem()]
if !ok {
return nil, errors.ErrMsgType
}
content, err := json.Marshal(msg)
if err != nil {
return nil, err
}
buffer := bytes.NewBuffer(nil)
buffer.WriteByte(typeByte)
binary.Write(buffer, binary.BigEndian, int64(len(content)))
buffer.Write(content)
return buffer.Bytes(), nil
}