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70 lines
1.6 KiB
70 lines
1.6 KiB
// Copyright 2016 fatedier, fatedier@gmail.com
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package msg
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import (
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"bytes"
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"encoding/binary"
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"encoding/json"
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"fmt"
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"reflect"
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"github.com/fatedier/frp/utils/errors"
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)
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func unpack(typeByte byte, buffer []byte, msgIn Message) (msg Message, err error) {
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if msgIn == nil {
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t, ok := TypeMap[typeByte]
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if !ok {
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err = fmt.Errorf("Unsupported message type %b", typeByte)
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return
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}
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msg = reflect.New(t).Interface().(Message)
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} else {
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msg = msgIn
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}
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err = json.Unmarshal(buffer, &msg)
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return
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}
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func UnPackInto(buffer []byte, msg Message) (err error) {
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_, err = unpack(' ', buffer, msg)
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return
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}
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func UnPack(typeByte byte, buffer []byte) (msg Message, err error) {
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return unpack(typeByte, buffer, nil)
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}
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func Pack(msg Message) ([]byte, error) {
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typeByte, ok := TypeStringMap[reflect.TypeOf(msg).Elem()]
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if !ok {
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return nil, errors.ErrMsgType
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}
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content, err := json.Marshal(msg)
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if err != nil {
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return nil, err
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}
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buffer := bytes.NewBuffer(nil)
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buffer.WriteByte(typeByte)
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binary.Write(buffer, binary.BigEndian, int64(len(content)))
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buffer.Write(content)
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return buffer.Bytes(), nil
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}
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