mirror of
https://github.com/fatedier/frp.git
synced 2024-12-16 03:19:00 +08:00
89 lines
1.8 KiB
Go
89 lines
1.8 KiB
Go
// 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 (
|
|
"encoding/binary"
|
|
"fmt"
|
|
"io"
|
|
)
|
|
|
|
var (
|
|
MaxMsgLength int64 = 10240
|
|
)
|
|
|
|
func readMsg(c io.Reader) (typeByte byte, buffer []byte, err error) {
|
|
buffer = make([]byte, 1)
|
|
_, err = c.Read(buffer)
|
|
if err != nil {
|
|
return
|
|
}
|
|
typeByte = buffer[0]
|
|
if _, ok := TypeMap[typeByte]; !ok {
|
|
err = fmt.Errorf("Message type error")
|
|
return
|
|
}
|
|
|
|
var length int64
|
|
err = binary.Read(c, binary.BigEndian, &length)
|
|
if err != nil {
|
|
return
|
|
}
|
|
if length > MaxMsgLength {
|
|
err = fmt.Errorf("Message length exceed the limit")
|
|
return
|
|
}
|
|
|
|
buffer = make([]byte, length)
|
|
n, err := io.ReadFull(c, buffer)
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
if int64(n) != length {
|
|
err = fmt.Errorf("Message format error")
|
|
}
|
|
return
|
|
}
|
|
|
|
func ReadMsg(c io.Reader) (msg Message, err error) {
|
|
typeByte, buffer, err := readMsg(c)
|
|
if err != nil {
|
|
return
|
|
}
|
|
return UnPack(typeByte, buffer)
|
|
}
|
|
|
|
func ReadMsgInto(c io.Reader, msg Message) (err error) {
|
|
_, buffer, err := readMsg(c)
|
|
if err != nil {
|
|
return
|
|
}
|
|
return UnPackInto(buffer, msg)
|
|
}
|
|
|
|
func WriteMsg(c io.Writer, msg interface{}) (err error) {
|
|
buffer, err := Pack(msg)
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
if _, err = c.Write(buffer); err != nil {
|
|
return
|
|
}
|
|
|
|
return nil
|
|
}
|