mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-01 09:01:33 +08:00
237 lines
7.0 KiB
C++
237 lines
7.0 KiB
C++
/*
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* MIT License
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*
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* Copyright (c) 2016 xiongziliang <771730766@qq.com>
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*
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* This file is part of ZLMediaKit(https://github.com/xiongziliang/ZLMediaKit).
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "WebSocketSplitter.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include "Util/logger.h"
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#include "Util/util.h"
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using namespace ZL::Util;
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namespace ZL {
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namespace Http {
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/**
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*
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-------+-+-------------+-------------------------------+
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|F|R|R|R| opcode|M| Payload len | Extended payload length |
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|I|S|S|S| (4) |A| (7) | (16/64) |
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|N|V|V|V| |S| | (if payload len==126/127) |
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| |1|2|3| |K| | |
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+-+-+-+-+-------+-+-------------+ - - - - - - - - - - - - - - - +
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| Extended payload length continued, if payload len == 127 |
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+ - - - - - - - - - - - - - - - +-------------------------------+
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| |Masking-key, if MASK set to 1 |
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+-------------------------------+-------------------------------+
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| Masking-key (continued) | Payload Data |
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+-------------------------------- - - - - - - - - - - - - - - - +
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: Payload Data continued ... :
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+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
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| Payload Data continued ... |
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+---------------------------------------------------------------+
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*/
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#define CHECK_LEN(size) \
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do{ \
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if(len - (ptr - data) < size){ \
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if(_remain_data.empty()){ \
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_remain_data.assign((char *)data,len); \
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} \
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return ; \
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} \
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}while(0) \
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void WebSocketSplitter::decode(uint8_t *data,uint64_t len) {
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uint8_t *ptr = data;
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if(!_got_header) {
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//还没有获取数据头
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if(!_remain_data.empty()){
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_remain_data.append((char *)data,len);
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data = ptr = (uint8_t *)_remain_data.data();
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len = _remain_data.size();
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}
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begin_decode:
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CHECK_LEN(1);
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_fin = (*ptr & 0x80) >> 7;
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_reserved = (*ptr & 0x70) >> 4;
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_opcode = (WebSocketHeader::Type) (*ptr & 0x0F);
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ptr += 1;
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CHECK_LEN(1);
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_mask_flag = (*ptr & 0x80) >> 7;
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_playload_len = (*ptr & 0x7F);
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ptr += 1;
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if (_playload_len == 126) {
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CHECK_LEN(2);
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_playload_len = (*ptr << 8) | *(ptr + 1);
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ptr += 2;
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} else if (_playload_len == 127) {
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CHECK_LEN(8);
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_playload_len = ((uint64_t) ptr[0] << (8 * 7)) |
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((uint64_t) ptr[1] << (8 * 6)) |
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((uint64_t) ptr[2] << (8 * 5)) |
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((uint64_t) ptr[3] << (8 * 4)) |
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((uint64_t) ptr[4] << (8 * 3)) |
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((uint64_t) ptr[5] << (8 * 2)) |
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((uint64_t) ptr[6] << (8 * 1)) |
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((uint64_t) ptr[7] << (8 * 0));
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ptr += 8;
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}
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if (_mask_flag) {
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CHECK_LEN(4);
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_mask.assign(ptr, ptr + 4);
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ptr += 4;
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}
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_got_header = true;
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_mask_offset = 0;
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_playload_offset = 0;
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onWebSocketDecodeHeader(*this);
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if(_playload_len == 0){
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onWebSocketDecodeComplete(*this);
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}
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}
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//进入后面逻辑代表已经获取到了webSocket协议头，
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uint64_t remain = len - (ptr - data);
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if(remain > 0){
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uint64_t playload_slice_len = remain;
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if(playload_slice_len + _playload_offset > _playload_len){
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playload_slice_len = _playload_len - _playload_offset;
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}
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_playload_offset += playload_slice_len;
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onPlayloadData(ptr,playload_slice_len);
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if(_playload_offset == _playload_len){
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onWebSocketDecodeComplete(*this);
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//这是下一个包
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remain -= playload_slice_len;
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ptr += playload_slice_len;
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_got_header = false;
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if(remain > 0){
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//剩余数据是下一个包，把它的数据放置在缓存中
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_remain_data.assign((char *)ptr,remain);
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data = ptr = (uint8_t *)_remain_data.data();
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len = _remain_data.size();
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goto begin_decode;
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}
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}
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}
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_remain_data.clear();
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}
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void WebSocketSplitter::onPlayloadData(uint8_t *ptr, uint64_t len) {
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if(_mask_flag){
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for(int i = 0; i < len ; ++i,++ptr){
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*(ptr) ^= _mask[(i + _mask_offset) % 4];
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}
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_mask_offset = (_mask_offset + len) % 4;
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}
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onWebSocketDecodePlayload(*this, _mask_flag ? ptr - len : ptr, len, _playload_offset);
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}
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void WebSocketSplitter::encode(const WebSocketHeader &header,uint8_t *data, uint64_t len) {
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string ret;
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uint8_t byte = header._fin << 7 | ((header._reserved & 0x07) << 4) | (header._opcode & 0x0F) ;
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ret.push_back(byte);
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auto mask_flag = (header._mask_flag && header._mask.size() >= 4);
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byte = mask_flag << 7;
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if(len < 126){
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byte |= len;
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ret.push_back(byte);
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}else if(len <= 0xFFFF){
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byte |= 126;
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ret.push_back(byte);
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uint16_t len = htons(len);
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ret.append((char *)&len,2);
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}else{
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byte |= 127;
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ret.push_back(byte);
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uint32_t len_high = htonl(len >> 32) ;
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uint32_t len_low = htonl(len & 0xFFFFFFFF);
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ret.append((char *)&len_high,4);
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ret.append((char *)&len_low,4);
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}
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if(mask_flag){
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ret.append((char *)header._mask.data(),4);
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}
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onWebSocketEncodeData((uint8_t*)ret.data(),ret.size());
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if(len > 0){
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if(mask_flag){
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uint8_t *ptr = data;
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for(int i = 0; i < len ; ++i,++ptr){
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*(ptr) ^= header._mask[i % 4];
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}
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}
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onWebSocketEncodeData(data,len);
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}
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}
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} /* namespace Http */
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} /* namespace ZL */
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