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152 lines
3.6 KiB
Go
152 lines
3.6 KiB
Go
package protocol
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import (
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"compress/zlib"
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"errors"
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"fmt"
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"github.com/injoyai/base/bytes"
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"github.com/injoyai/base/g"
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"github.com/injoyai/conv"
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"io"
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)
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const (
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// Prefix 固定帧头
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Prefix = 0x0C
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// PrefixResp 响应帧头
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PrefixResp = 0xB1CB7400
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)
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type Message interface {
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Bytes() g.Bytes
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}
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/*
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Frame 数据帧
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0c 02189300 01 0300 0300 0d00 01
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0c 00000000 00 0200 0200 1500
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0c 01000000 01 0300 0300 0d00 01
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0c 01000000 01 0300 0300 0d00 01
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0c 02000000 01 1a00 1a00 3e05 050000000000000002000030303030303101363030303038
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0c0100000001030003000d0001
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*/
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type Frame struct {
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MsgID uint32 //消息ID
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Control Control //控制码,这个还不知道怎么定义
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Type uint16 //请求类型,如建立连接，请求分时数据等
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Data []byte //数据
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}
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func (this *Frame) Bytes() g.Bytes {
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length := uint16(len(this.Data) + 2)
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data := make([]byte, 12+len(this.Data))
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data[0] = Prefix
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copy(data[1:], Bytes(this.MsgID))
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data[5] = this.Control.Uint8()
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copy(data[6:], Bytes(length))
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copy(data[8:], Bytes(length))
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copy(data[10:], Bytes(this.Type))
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copy(data[12:], this.Data)
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return data
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}
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type Response struct {
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Prefix uint32 //未知,猜测是帧头
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Control uint8 //响应的控制码,目前发现0c是错误,1c是成功,猜测左数右第4位代表是否成功
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MsgID uint32 //消息ID
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Unknown uint8 //未知,猜测是响应的控制码
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Type uint16 //响应类型,对应请求类型,如建立连接，请求分时数据等
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ZipLength uint16 //数据长度
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Length uint16 //未压缩长度
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Data []byte //数据域
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}
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/*
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Decode
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帧头 |控制码 |消息ID |控制码 |数据类型 |未解压长度 |解压长度 |数据域
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b1cb7400 |1c |00000000 |00 |0d00 |5100 |bd00 |789c6378c1cecb252ace6066c5b4898987b9050ed1f90cc5b74c18a5bc18c1b43490fecff09c81819191f13fc3c9f3bb169f5e7dfefeb5ef57f7199a305009308208e5b32bb6bcbf70148712002d7f1e13
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*/
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func Decode(bs []byte) (*Response, error) {
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if len(bs) < 16 {
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return nil, errors.New("数据长度不足")
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}
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resp := &Response{
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Prefix: Uint32(bs[:4]),
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Control: bs[4],
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MsgID: Uint32(bs[5:9]),
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Unknown: bs[9],
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Type: Uint16(bs[10:12]),
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ZipLength: Uint16(bs[12:14]),
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Length: Uint16(bs[14:16]),
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Data: bs[16:],
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}
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if resp.Control&0x10 != 0x10 {
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return nil, fmt.Errorf("请求失败,请检查参数")
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}
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if int(resp.ZipLength) != len(bs[16:]) {
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return nil, fmt.Errorf("压缩数据长度不匹配,预期%d,得到%d", resp.ZipLength+16, len(bs))
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}
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//进行数据解压
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if resp.ZipLength != resp.Length {
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r, err := zlib.NewReader(bytes.NewReader(resp.Data))
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if err != nil {
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return nil, err
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}
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defer r.Close()
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resp.Data, err = io.ReadAll(r)
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if err != nil {
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return nil, err
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}
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}
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if int(resp.Length) != len(resp.Data) {
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return nil, fmt.Errorf("解压数据长度不匹配,预期%d,得到%d", resp.Length, len(resp.Data))
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}
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return resp, nil
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}
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// ReadFrom 这里的r推荐传入*bufio.Reader
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func ReadFrom(r io.Reader) (result []byte, err error) {
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prefix := make([]byte, 4)
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for {
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result = []byte(nil)
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//读取帧头
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_, err := io.ReadFull(r, prefix)
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if err != nil {
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return nil, err
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}
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if conv.Uint32(prefix) != PrefixResp {
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continue
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}
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result = append(result, prefix...)
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//读取12字节
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buf := make([]byte, 12)
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_, err = io.ReadFull(r, buf)
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if err != nil {
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return nil, err
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}
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result = append(result, buf...)
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//获取后续字节长度
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length := uint16(result[13])<<8 + uint16(result[12])
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buf = make([]byte, length)
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_, err = io.ReadFull(r, buf)
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if err != nil {
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return nil, err
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}
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result = append(result, buf...)
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return result, nil
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}
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}
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