msg.go
1.16 KB
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package net
import (
"bytes"
"encoding/binary"
"fmt"
"pro2d/common"
)
func ParseMsg (data []byte, atEOF bool) (advance int, token []byte, err error) {
// 表示我们已经扫描到结尾了
if atEOF && len(data) == 0 {
return 0, nil, nil
}
if !atEOF && len(data) >= common.HEADLEN { //4字节数据包长度 4字节指令
length := int32(0)
binary.Read(bytes.NewReader(data[0:4]), binary.BigEndian, &length)
if length <= 0 {
return 0, nil, fmt.Errorf("length is 0")
}
if int(length) <= len(data) {
return int(length) , data[:int(length)], nil
}
return 0 , nil, nil
}
if atEOF {
return len(data), data, nil
}
return 0, nil, nil
}
func DecodeMsg(data []byte) (*MsgPkg, error) {
h := &Head{}
err := binary.Read(bytes.NewReader(data), binary.BigEndian, h)
if err != nil {
return nil, err
}
return &MsgPkg{
Head: h,
Body: data[common.HEADLEN:],
},nil
}
func EncodeMsg(pkg *MsgPkg) ([]byte, error) {
buf := &bytes.Buffer{}
err := binary.Write(buf, binary.BigEndian, pkg.Head)
if err != nil {
return nil, err
}
err = binary.Write(buf, binary.BigEndian, pkg.Body)
if err != nil {
return nil, err
}
return buf.Bytes(), nil
}