WebSocketSplitter.h

/*
 * MIT License
 *
 * Copyright (c) 2016-2019 xiongziliang <771730766@qq.com>
 *
 * This file is part of ZLMediaKit(https://github.com/xiongziliang/ZLMediaKit).
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#ifndef ZLMEDIAKIT_WEBSOCKETSPLITTER_H
#define ZLMEDIAKIT_WEBSOCKETSPLITTER_H

#include <cstdint>
#include <string>
#include <vector>
#include <memory>
using namespace std;


namespace mediakit {

class WebSocketHeader {
public:
    typedef std::shared_ptr<WebSocketHeader> Ptr;
    typedef enum {
        CONTINUATION = 0x0,
        TEXT = 0x1,
        BINARY = 0x2,
        RSV3 = 0x3,
        RSV4 = 0x4,
        RSV5 = 0x5,
        RSV6 = 0x6,
        RSV7 = 0x7,
        CLOSE = 0x8,
        PING = 0x9,
        PONG = 0xA,
        CONTROL_RSVB = 0xB,
        CONTROL_RSVC = 0xC,
        CONTROL_RSVD = 0xD,
        CONTROL_RSVE = 0xE,
        CONTROL_RSVF = 0xF
    } Type;
public:
    WebSocketHeader() : _mask(4){}
    virtual ~WebSocketHeader(){}
public:
    bool _fin;
    uint8_t _reserved;
    Type _opcode;
    bool _mask_flag;
    uint64_t _playload_len;
    vector<uint8_t > _mask;
};

class WebSocketSplitter : public WebSocketHeader{
public:
    WebSocketSplitter(){}
    virtual ~WebSocketSplitter(){}

    /**
     * 输入数据以便解包webSocket数据以及处理粘包问题
     * 可能触发onWebSocketDecodeHeader和onWebSocketDecodePlayload回调
     * @param data 需要解包的数据，可能是不完整的包或多个包
     * @param len 数据长度
     */
    void decode(uint8_t *data,uint64_t len);

    /**
     * 编码一个数据包
     * 将触发2次onWebSocketEncodeData回调
     * 第一次是数据头，第二次是负载数据
     * @param header 数据头
     * @param data 负载数据
     * @param len 负载数据长度
     */
    void encode(const WebSocketHeader &header,uint8_t *data,const uint64_t len);
protected:
    /**
     * 收到一个webSocket数据包包头，后续将继续触发onWebSocketDecodePlayload回调
     * @param header 数据包头
     */
    virtual void onWebSocketDecodeHeader(const WebSocketHeader &header) {};

    /**
     * 收到webSocket数据包负载
     * @param header 数据包包头
     * @param ptr 负载数据指针
     * @param len 负载数据长度
     * @param recved 已接收数据长度(包含本次数据长度)，等于header._playload_len时则接受完毕
     */
    virtual void onWebSocketDecodePlayload(const WebSocketHeader &header, const uint8_t *ptr, uint64_t len, uint64_t recved) {};


    /**
     * 接收到完整的一个webSocket数据包后回调
     * @param header 数据包包头
     */
    virtual void onWebSocketDecodeComplete(const WebSocketHeader &header) {};

    /**
     * websocket数据编码回调
     * @param ptr 数据指针
     * @param len 数据指针长度
     */
    virtual void onWebSocketEncodeData(const uint8_t *ptr,uint64_t len){};
private:
    void onPlayloadData(uint8_t *data,uint64_t len);
private:
    string _remain_data;
    int _mask_offset = 0;
    bool _got_header = false;
    uint64_t _playload_offset = 0;
};

} /* namespace mediakit */


#endif //ZLMEDIAKIT_WEBSOCKETSPLITTER_H